We consider algorithms for distributed optimization and their applications. In this thesis, we propose a new approach for distributed optimization based on an emerging area of theoretical computer science \u2013 local computation algorithms. The approach is fundamentally different from existing methodologies and provides a number of benefits, such as robustness to link failure and adaptivity to dynamic settings. Specifically, we develop an algorithm, LOCO, that given a convex optimization problem P with n variables and a \u201csparse\u201d linear constraint matrix with m constraints, provably finds a solution as good as that of the best online algorithm for P using only O(log(n + m)) messages with high probability. The approach is not iterative and communication is restricted to a localized neighborhood. In addition to analytic results, we show numerically that the performance improvements over classical approaches for distributed optimization are significant, e.g., it uses orders of magnitude less communication than ADMM.
\r\n\r\nWe also consider the operations of a geographically distributed cloud data market. We consider design decisions that include which data to purchase (data purchasing) and where to place or replicate the data for delivery (data placement). We show that a joint approach to data purchasing and data placement within a cloud data market improves operating costs. This problem can be viewed as a facility location problem, and is thus NP-hard. However, we give a provably optimal algorithm for the case of a data market consisting of a single data center, and then generalize the result from the single data center setting in order to develop a near-optimal, polynomial-time algorithm for a geo-distributed data market. The resulting design, Datum, decomposes the joint purchasing and placement problem into two subproblems, one for data purchasing and one for data placement, using a transformation of the underlying bandwidth costs. We show, via a case study, that Datum is near-optimal (within 1.6%) in practical settings.
" }, { "name": "Ziani, Juba", "degree": "Masters", "year": "2017", "title": "Efficiently Characterizing Games Consistent with Perturbed Equilibrium Observations", "advisor": "Ligett, Katrina A.; Chandrasekaran, Venkat", "url": "https://resolver.caltech.edu/CaltechTHESIS:12122016-183248666", "creators": [ { "name": { "family": "Ziani", "given": "Juba" }, "id": "Ziani-Juba", "orcid": "0000-0002-3324-4349", "display_name": "Ziani, Juba" } ], "advisors": [ { "name": { "family": "Ligett", "given": "Katrina A." }, "id": "Ligett-Katrina-A", "role": "advisor", "display_name": "Ligett, Katrina A." }, { "name": { "family": "Chandrasekaran", "given": "Venkat" }, "id": "Chandrasekaran-V", "role": "advisor", "display_name": "Chandrasekaran, Venkat" } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/Z91Z42CF", "abstract": "In this thesis, we study the problem of characterizing the set of games that are consistent with observed equilibrium play, a fundamental problem in econometrics. Our contribution is to develop and analyze a new methodology based on convex optimization to address this problem, for many classes of games and observation models of interest. Our approach provides a sharp, computationally efficient characterization of the extent to which a particular set of observations constrains the space of games that could have generated them. This allows us to solve a number of variants of this problem as well as to quantify the power of games from particular classes (e.g., zero-sum, potential, linearly parameterized) to explain player behavior.
\r\n\r\nWe illustrate our approach with numerical simulations.
" }, { "name": "Cruz, Gerardo", "degree": "Masters", "year": "2016", "title": "Economic Fluctuations and Capitalistic Production: A Case Study in Robustness Constraints", "advisor": "Doyle, John Comstock; Murray, Richard M.", "url": "https://resolver.caltech.edu/CaltechTHESIS:06202016-133637013", "creators": [ { "name": { "family": "Cruz", "given": "Gerardo" }, "id": "Cruz-Gerardo", "display_name": "Cruz, Gerardo" } ], "advisors": [ { "name": { "family": "Doyle", "given": "John Comstock" }, "id": "Doyle-J-C", "role": "advisor", "display_name": "Doyle, John Comstock" }, { "name": { "family": "Murray", "given": "Richard M." }, "id": "Murray-R-M", "role": "co-advisor", "display_name": "Murray, Richard M." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "cds" ], "doi": "10.7907/FDCE-MQ31", "abstract": "A central pursuit of macroeconomic research is to understand the source of short run variations in aggregate economic variables. To this end, the branch of macroeconomics known as Real Business Cycle (RBC) theory emphasizes the role of disturbances to the real economy while abstracting from nominal variables (e.g. money). According to RBC theory, business cycles are the result of optimal responses to exogenous stochastic disturbances on technology in a structure of capitalistic production. In this report, we contend that the structure of capitalistic production per se constrains the ability of the economy to absorb shocks. That is, even if the feedback behavior in the model is designed to mitigate fluctuation (and is not necessarily optimal relative to some inter-temporal utility), the resulting sensitivity is nevertheless constrained by a lower bound. Moreover, we show that this lower bound is exacerbated with increasing steady state consumption, capital and investment. Concretely, we show that the Ramsey model, linearized about its steady state equilibrium, has a non-minimum phase structure and therefore its sensitivity is constrained by the control theoretic design limits. Moreover, the non-minimum phase zero is given by the inverse of the discount factor. As the discount factor approaches unity, steady state consumption approaches optimal steady state consumption, but the non-minimum phase zero approaches the closed unit circle exacerbating the sensitivity constraints." }, { "name": "Mehta, Jenish C.", "degree": "Masters", "year": "2016", "title": "Behavior of O(log n) Local Commuting Hamiltonians", "advisor": "Vidick, Thomas G.; Schulman, Leonard J.", "url": "https://resolver.caltech.edu/CaltechTHESIS:05272016-141059835", "creators": [ { "name": { "family": "Mehta", "given": "Jenish C." }, "id": "Mehta-Jenish-C", "display_name": "Mehta, Jenish C." } ], "advisors": [ { "name": { "family": "Vidick", "given": "Thomas G." }, "id": "Vidick-T", "orcid": "0000-0002-6405-365X", "role": "advisor", "display_name": "Vidick, Thomas G." }, { "name": { "family": "Schulman", "given": "Leonard J." }, "id": "Schulman-L-J", "orcid": "0000-0001-9901-2797", "role": "advisor", "display_name": "Schulman, Leonard J." } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/Z9V98611", "abstract": "We study the variant of the k-local hamiltonian problem which is a natural generalization of k-CSPs, in which the hamiltonian terms all commute. More specifically, we consider a hamiltonian H over n qubits, where H is a sum of k-local terms acting non-trivially on O(log n) qubits, and all the k-local terms commute, and show the following -
\r\n\r\n1. We show that a specific case of O(log n) local commuting hamiltonians over the hypercube is in NP using the Bravyi-Vyalyi Structure theorem.
\r\n\r\n2. We give a simple proof of a generalized area law for commuting hamiltonians (which seems to be a folklore result) in all dimensions, and deduce the case for O(log n) local commuting hamiltonians.
\r\n\r\n3. We show that traversing the ground space of O(log n) local commuting hamiltonians is QCMA complete.
\r\n\r\nThe first two behaviours seem to indicate that deciding whether the ground space energy of O(log n)-local commuting hamiltonians is low or high might be in NP or possibly QCMA, though the last behaviour seems to indicate that it may indeed be the case that O(log n)-local commuting hamiltonians are QMA complete.
" }, { "name": "Agarwal, Anish", "degree": "Masters", "year": "2015", "title": "A Model For Residential Adoption of Photovoltaic Systems", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechTHESIS:03202015-082016718", "creators": [ { "name": { "family": "Agarwal", "given": "Anish" }, "id": "Agarwal-Anish", "display_name": "Agarwal, Anish" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/Z9RB72J4", "abstract": "The rapid rise in the residential photo voltaic (PV) adoptions in the past half decade has created a need in the electricity industry for a widely-accessible model that estimates PV adoption based on a combination of different business and policy decisions. This work analyzes historical adoption patterns and finds fiscal savings to be the single most important factor in PV adoption, with significantly greater predictive power compared to all other socioeconomic factors including income and education. We can create an application available on Google App Engine (GAE) based on our findings that allows all stakeholders including policymakers, power system researchers and regulators to study the complex and coupled relationship between PV adoption, utility economics and grid sustainability. The application allows users to experiment with different customer demographics, tier structures and subsidies, hence allowing them to tailor the application to the geographic region they are studying. This study then demonstrates the different type of analyses possible with the application by studying the relative impact of different policies regarding tier structures, fixed charges and PV prices on PV adoption." }, { "name": "Ren, Xiaoqi", "degree": "Masters", "year": "2015", "title": "Speculation-Aware Resource Allocation for Cluster Schedulers", "advisor": "Wierman, Adam C.", "url": "https://resolver.caltech.edu/CaltechTHESIS:09252014-063715278", "creators": [ { "name": { "family": "Ren", "given": "Xiaoqi" }, "id": "Ren-Xiaoqi", "orcid": "0000-0002-1121-9046", "display_name": "Ren, Xiaoqi" } ], "advisors": [ { "name": { "family": "Wierman", "given": "Adam C." }, "id": "Wierman-A-C", "role": "advisor", "display_name": "Wierman, Adam C." } ], "committee": [ { "name": { "family": "Wierman", "given": "Adam C." }, "id": "Wierman-A-C", "role": "chair", "display_name": "Wierman, Adam C." } ], "option_major": [ "compsci" ], "doi": "10.7907/Z9R49NRJ", "abstract": "Real-time demand response is essential for handling the uncertainties of renewable generation. Traditionally, demand response has been focused on large industrial and commercial loads, however it is expected that a large number of small residential loads such as air conditioners, dish washers, and electric vehicles will also participate in the coming years. The electricity consumption of these smaller loads, which we call deferrable loads, can be shifted over time, and thus be used (in aggregate) to compensate for the random fluctuations in renewable generation.
\r\n\r\nIn this thesis, we propose a real-time distributed deferrable load control algorithm to reduce the variance of aggregate load (load minus renewable generation) by shifting the power consumption of deferrable loads to periods with high renewable generation. The algorithm is model predictive in nature, i.e., at every time step, the algorithm minimizes the expected variance to go with updated predictions. We prove that suboptimality of this model predictive algorithm vanishes as time horizon expands in the average case analysis. Further, we prove strong concentration results on the distribution of the load variance obtained by model predictive deferrable load control. These concentration results highlight that the typical performance of model predictive deferrable load control is tightly concentrated around the average-case performance. Finally, we evaluate the algorithm via trace-based simulations.
" }, { "name": "Chang, Xiaofei", "degree": "Masters", "year": "2014", "title": "Resetting Asynchronous QDI Systems", "advisor": "Martin, Alain J.", "url": "https://resolver.caltech.edu/CaltechTHESIS:10042013-160844239", "creators": [ { "name": { "family": "Chang", "given": "Xiaofei" }, "id": "Chang-Xiaofei", "display_name": "Chang, Xiaofei" } ], "advisors": [ { "name": { "family": "Martin", "given": "Alain J." }, "id": "Martin-A-J", "role": "advisor", "display_name": "Martin, Alain J." } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/RNGK-RV18", "abstract": "Quasi Delay-Insensitive (QDI) systems must be reset into a valid initial state before normal operation can start. Otherwise, deadlock may occur due to wrong handshake communication between processes. This thesis first reviews the traditional Global Reset Schemes (GRS). It then proposes a new Wave Reset Schemes (WRS). By utilizing the third possible value of QDI data codes - reset value, WRS propagates the data with reset value and triggers Local Reset (LR) sequentially. The global reset network for GRS can be removed and all reset signals are generated locally for each process. Circuits templates as well as some special blocks are modified to accommodate the reset value in WRS. An algorithm is proposed to choose the proper Local Reset Input (LRI) in order to shorten reset time. WRS is then applied to an iterative multiplier. The multiplier is proved working under different operating conditions." }, { "name": "Chen, Niangjun", "degree": "Masters", "year": "2014", "title": "Model Predictive Control for Deferrable Loads Scheduling", "advisor": "Wierman, Adam C.; Low, Steven H.", "url": "https://resolver.caltech.edu/CaltechTHESIS:06022014-205438709", "creators": [ { "name": { "family": "Chen", "given": "Niangjun" }, "id": "Chen-Niangjun", "display_name": "Chen, Niangjun" } ], "advisors": [ { "name": { "family": "Wierman", "given": "Adam C." }, "id": "Wierman-A-C", "role": "co-advisor", "display_name": "Wierman, Adam C." }, { "name": { "family": "Low", "given": "Steven H." }, "id": "Low-S-H", "role": "co-advisor", "display_name": "Low, Steven H." } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/493H-BD56", "abstract": "Real-time demand response is essential for handling the uncertainties of renewable generation. Traditionally, demand response has been focused on large industrial and commercial loads, however it is expected that a large number of small residential loads such as air conditioners, dish washers, and electric vehicles will also participate in the coming years. The electricity consumption of these smaller loads, which we call deferrable loads, can be shifted over time, and thus be used (in aggregate) to compensate for the random fluctuations in renewable generation.
\r\n\r\nIn this thesis, we propose a real-time distributed deferrable load control algorithm to reduce the variance of aggregate load (load minus renewable generation) by shifting the power consumption of deferrable loads to periods with high renewable generation. The algorithm is model predictive in nature, i.e., at every time step, the algorithm minimizes the expected variance to go with updated predictions. We prove that suboptimality of this model predictive algorithm vanishes as time horizon expands in the average case analysis. Further, we prove strong concentration results on the distribution of the load variance obtained by model predictive deferrable load control. These concentration results highlight that the typical performance of model predictive deferrable load control is tightly concentrated around the average-case performance. Finally, we evaluate the algorithm via trace-based simulations.
\r\n" }, { "name": "Eyjolfsdottir, Eyrun Arna", "degree": "Masters", "year": "2014", "title": "Detecting Actions of Fruit Flies", "advisor": "Perona, Pietro", "url": "https://resolver.caltech.edu/CaltechTHESIS:04212014-143100101", "creators": [ { "name": { "family": "Eyjolfsdottir", "given": "Eyrun Arna" }, "id": "Eyjolfsdottir-Eyrun-Anna", "display_name": "Eyjolfsdottir, Eyrun Arna" } ], "advisors": [ { "name": { "family": "Perona", "given": "Pietro" }, "id": "Perona-P", "role": "advisor", "display_name": "Perona, Pietro" } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/SD8H-YB17", "abstract": "In this thesis we describe a system that tracks fruit flies in video and automatically detects and classifies their actions. We introduce Caltech Fly-vs-Fly Interactions, a new dataset that contains hours of video showing pairs of fruit flies engaging in social interactions, and is published with complete expert annotations and articulated pose trajectory features. We compare experimentally the value of a frame-level feature representation with the more elaborate notion of bout features that capture the structure within actions. Similarly, we compare a simple sliding window classifier architecture with a more sophisticated structured output architecture, and find that window based detectors outperform the much slower structured counterparts, and approach human performance. In addition we test the top performing detector on the CRIM13 mouse dataset, finding that it matches the performance of the best published method.
" }, { "name": "Faulkner, Matthew Nicholas", "degree": "Masters", "year": "2014", "title": "Selective Data Gathering in Community Sensor Networks", "advisor": "Heaton, Thomas H.; Krause, R. Andreas; Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechTHESIS:04102014-131741107", "creators": [ { "name": { "family": "Faulkner", "given": "Matthew Nicholas" }, "id": "Faulkner-Matthew-Nicholas", "display_name": "Faulkner, Matthew Nicholas" } ], "advisors": [ { "name": { "family": "Heaton", "given": "Thomas H." }, "id": "Heaton-T-H", "role": "advisor", "display_name": "Heaton, Thomas H." }, { "name": { "family": "Krause", "given": "R. Andreas" }, "id": "Krause-R-A", "role": "co-advisor", "display_name": "Krause, R. Andreas" }, { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "co-advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/NBQ4-6Q72", "abstract": "Smartphones and other powerful sensor-equipped consumer devices make it possible to sense the physical world at an unprecedented scale. Nearly 2 million Android and iOS devices are activated every day, each carrying numerous sensors and a high-speed internet connection. Whereas traditional sensor networks have typically deployed a fixed number of devices to sense a particular phenomena, community networks can grow as additional participants choose to install apps and join the network. In principle, this allows networks of thousands or millions of sensors to be created quickly and at low cost. However, making reliable inferences about the world using so many community sensors involves several challenges, including scalability, data quality, mobility, and user privacy.
\r\n\r\nThis thesis focuses on how learning at both the sensor- and network-level can provide scalable techniques for data collection and event detection. First, this thesis considers the abstract problem of distributed algorithms for data collection, and proposes a distributed, online approach to selecting which set of sensors should be queried. In addition to providing theoretical guarantees for submodular objective functions, the approach is also compatible with local rules or heuristics for detecting and transmitting potentially valuable observations. Next, the thesis presents a decentralized algorithm for spatial event detection, and describes its use detecting strong earthquakes within the Caltech Community Seismic Network. Despite the fact that strong earthquakes are rare and complex events, and that community sensors can be very noisy, our decentralized anomaly detection approach obtains theoretical guarantees for event detection performance while simultaneously limiting the rate of false alarms.
" }, { "name": "Guo, Zeyu", "degree": "Masters", "year": "2014", "title": "Randomness-Efficient Curve Sampling", "advisor": "Umans, Christopher M.", "url": "https://resolver.caltech.edu/CaltechTHESIS:02242014-040043833", "creators": [ { "name": { "family": "Guo", "given": "Zeyu" }, "id": "Guo-Zeyu", "orcid": "0000-0001-7893-4346", "display_name": "Guo, Zeyu" } ], "advisors": [ { "name": { "family": "Umans", "given": "Christopher M." }, "id": "Umans-C-M", "role": "advisor", "display_name": "Umans, Christopher M." } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/N64Q-T997", "abstract": "Curve samplers are sampling algorithms that proceed by viewing the domain as a vector space over a finite field, and randomly picking a low-degree curve in it as the sample. Curve samplers exhibit a nice property besides the sampling property: the restriction of low-degree polynomials over the domain to the sampled curve is still low-degree. This property is often used in combination with the sampling property and has found many applications, including PCP constructions, local decoding of codes, and algebraic PRG constructions.
\r\n\r\nThe randomness complexity of curve samplers is a crucial parameter for its applications. It is known that (non-explicit) curve samplers using O(log N + log(1/\u03b4)) random bits exist, where N is the domain size and \u03b4 is the confidence error. The question of explicitly constructing randomness-efficient curve samplers was first raised in [TU06] where they obtained curve samplers with near-optimal randomness complexity.
\r\n\r\nIn this thesis, we present an explicit construction of low-degree curve samplers with optimal randomness complexity (up to a constant factor) that sample curves of degree (m logq(1/\u03b4))O(1) in Fqm. Our construction is a delicate combination of several components, including extractor machinery, limited independence, iterated sampling, and list-recoverable codes.
" }, { "name": "Mou, Judy", "degree": "Masters", "year": "2013", "title": "Situation Awareness Application", "advisor": "Chandy, K. Mani; Bunn, Julian J.", "url": "https://resolver.caltech.edu/CaltechTHESIS:06272013-211013400", "creators": [ { "name": { "family": "Mou", "given": "Judy" }, "id": "Mou-Judy", "display_name": "Mou, Judy" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" }, { "name": { "family": "Bunn", "given": "Julian J." }, "id": "Bunn-J-J", "role": "advisor", "display_name": "Bunn, Julian J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/CH76-YW89", "abstract": "This thesis describes the design and implementation of a situation awareness application. The application gathers data from sensors including accelerometers for monitoring earthquakes, carbon monoxide sensors for monitoring fires, radiation detectors, and dust sensors. The application also gathers Internet data sources including data about traffic congestion on daily commute routes, information about hazards, news relevant to the user of the application, and weather. The application sends the data to a Cloud computing service which aggregates data streams from multiple sites and detects anomalies. Information from the Cloud service is then displayed by the application on a tablet, computer monitor, or television screen. The situation awareness application enables almost all members of a community to remain aware of critical changes in their environments." }, { "name": "Hurwitz, Jeremy Scott", "degree": "Masters", "year": "2012", "title": "A Nearly-Quadratic Gap Between Adaptive and Non-Adaptive Property Testers", "advisor": "Umans, Christopher M.; Schulman, Leonard J.", "url": "https://resolver.caltech.edu/CaltechTHESIS:11302011-091414252", "creators": [ { "name": { "family": "Hurwitz", "given": "Jeremy Scott" }, "id": "Hurwitz-Jeremy-Scott", "display_name": "Hurwitz, Jeremy Scott" } ], "advisors": [ { "name": { "family": "Umans", "given": "Christopher M." }, "id": "Umans-C-M", "role": "co-advisor", "display_name": "Umans, Christopher M." }, { "name": { "family": "Schulman", "given": "Leonard J." }, "id": "Schulman-L-J", "role": "co-advisor", "display_name": "Schulman, Leonard J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/W178-HP57", "abstract": "We show that for all integers t \u2265 8 and arbitrarily small \u03b5 > 0, there exists a graph property \u03a0 (which depends on \u03b5) such that \u03b5-testing \u03a0 has non-adaptive query complexity Q = \u0398(q2-2/t), where q = \u00d5(\u03b5-1) is the adaptive query complexity. This resolves the question of how beneficial adaptivity is, in the context of proximity-dependent properties ([GR07]). This also gives evidence that the canonical transformation of Goldreich and Trevisan ([GT03]) is essentially optimal when converting an adaptive property tester into a non-adaptive property tester.
\r\n\r\nTo do so, we consider the property of being decomposable into a disjoint union of subgraphs, each of which is a (possibly unbalanced) blow-up of a given base-graph H. In [GR09], Goldreich and Ron proved that when H is a simple t-cycle, the non-adaptive query complexity is \u03a9(\u03b5-2+2/t, even under the promise that G has maximum degree O(\u03b5N). In this thesis, we prove a matching upper bound for the non-adaptive complexity and a tight (up to a polylogarithmic factor) upper bound on the adaptive complexity.
\r\n\r\nSpecifically, we show that for all H, testing whether G is a collection of blow-ups of H and has maximum degree O(\u03b5N) requires only O(\u03b5-1lg3\u03b5-1) adaptive queries or O(\u03b5-2+1/(\u03b4+2)+\u03b5-2+2/W) non-adaptive queries, where \u03b4 = \u0394(H) is the maximum degree of H and W< |H|2 is a bound on the size of witnesses against H.
" }, { "name": "Lee, Euiwoong", "degree": "Masters", "year": "2012", "title": "Clustering Affine Subspaces: Algorithms and Hardness", "advisor": "Schulman, Leonard J.", "url": "https://resolver.caltech.edu/CaltechTHESIS:07052012-191337554", "creators": [ { "name": { "family": "Lee", "given": "Euiwoong" }, "id": "Lee-Euiwoong", "display_name": "Lee, Euiwoong" } ], "advisors": [ { "name": { "family": "Schulman", "given": "Leonard J." }, "id": "Schulman-L-J", "role": "advisor", "display_name": "Schulman, Leonard J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/VF38-NT60", "abstract": "We study a generalization of the famous k-center problem where each object is an affine subspace of dimension \u0394, and give either the first or significantly improved algorithms and hardness results for many combinations of parameters. This generalization from points (\u0394=0) is motivated by the analysis of incomplete data, a pervasive challenge in statistics: incomplete data objects in Rd can be modeled as affine subspaces. We give three algorithmic results for different values of k, under the assumption that all subspaces are axis-parallel, the main case of interest because of the correspondence to missing entries in data tables.
\r\n\r\n1) k=1: Two polynomial time approximation schemes which runs in poly(\u0394, 1/\u03b5)nd.
\r\n\r\n2) k=2: O(\u03941/4)-approximation algorithm which runs in poly(n,d,\u0394)
\r\n\r\n3) General k: Polynomial time approximation scheme which runs in 2O(\u0394k log k(1+1/\u03b52))nd
\r\nWe also prove nearly matching hardness results; in both the general (not necessarily axis-parallel) case (for k \u2265 2) and in the axis-parallel case (for k \u2265 3), the running time of an approximation algorithm with any approximation ratio cannot be polynomial in even one of k and \u0394, unless P = NP. Furthermore, assuming that the 3-SAT problem cannot be solved subexponentially, the dependence on both k and \u0394 must be exponential in the general case (in the axis-parallel case, only the dependence on k drops to 2\u03a9\u221ak)). The simplicity of the first and the third algorithm suggests that they might be actually used in statistical applications. The second algorithm, which demonstrates a theoretical gap between the axis-parallel and general case for k=2, displays a strong connection between geometric clustering and classical coloring problems on graphs and hypergraphs, via a new Helly-type theorem.
" }, { "name": "Olson, Michael James", "degree": "Masters", "year": "2012", "title": "Cloud Computing for Citizen Science", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechTHESIS:08232011-122341638", "creators": [ { "name": { "family": "Olson", "given": "Michael James" }, "id": "Olson-Michael-James", "display_name": "Olson, Michael James" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/8S5K-FX17", "abstract": "My thesis describes the design and implementation of systems that empower individuals to help their communities respond to critical situations and to participate in research that helps them understand and improve their environments. People want to help their communities respond to threats such as earthquakes, wildfires, mudslides and hurricanes, and they want to participate in research that helps them understand and improve their environment. \u201cCitizen Science\u201d projects that facilitate this interaction include projects that monitor climate change, water quality and animal habitats. My thesis explores the design and analysis of community-based sense and response systems that enable individuals to participate in critical community activities and scientific research that monitors their environments." }, { "name": "Schaeffer, Joseph Malcolm", "degree": "Masters", "year": "2012", "title": "The Multistrand Simulator: Stochastic Simulation of the Kinetics of Multiple Interacting DNA Strands ", "advisor": "Winfree, Erik", "url": "https://resolver.caltech.edu/CaltechTHESIS:02022012-143934605", "creators": [ { "name": { "family": "Schaeffer", "given": "Joseph Malcolm" }, "id": "Schaeffer-Joseph-Malcolm", "display_name": "Schaeffer, Joseph Malcolm" } ], "advisors": [ { "name": { "family": "Winfree", "given": "Erik" }, "id": "Winfree-E", "role": "advisor", "display_name": "Winfree, Erik" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/BBH8-CG37", "abstract": "DNA has been used in vitro as a computational substrate due to programmable base-pairing interactions. This allows the construction of logic gates, self-assembled shapes, motors, walkers and other nanoscale devices comprised of DNA strands. These strands must be carefully designed in order to correctly perform their function, which requires effective models of the DNA system. The thermodynamics of multiple interacting DNA strands is a well-studied model which can make equilibrium predictions on these systems, but many devices operate far from equilibrium. The prediction of large non-equilibrium systems requires the simulation of a kinetics model, as these are both stochastic and computationally difficult to solve in an exact form. We developed the Multistrand kinetics simulator, which extends the previous work by expanding the kinetics model to handle multiple nucleic acid strands, as well as using optimized algorithms in order to speed up the simulations. " }, { "name": "Shin, Seung Woo", "degree": "Masters", "year": "2012", "title": "Compiling and Verifying DNA-Based Chemical Reaction Network Implementations", "advisor": "Winfree, Erik", "url": "https://resolver.caltech.edu/CaltechTHESIS:09182011-215125061", "creators": [ { "name": { "family": "Shin", "given": "Seung Woo" }, "id": "Shin-Seung-Woo", "display_name": "Shin, Seung Woo" } ], "advisors": [ { "name": { "family": "Winfree", "given": "Erik" }, "id": "Winfree-E", "role": "advisor", "display_name": "Winfree, Erik" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/QM4N-KX17", "abstract": "One goal of molecular programming and synthetic biology is to build chemical circuits that can control chemical processes at the molecular level. Remarkably, it has been shown that synthesized DNA molecules can be used to construct complex chemical circuits that operate without any enzyme or cellular component. However, designing DNA molecules at the individual nucleotide base level is often difficult and laborious, and thus chemical reaction networks (CRNs) have been proposed as a higher-level programming language. So far, several general-purpose schemes have been described for designing synthetic DNA molecules that simulate the behavior of arbitrary CRNs, and many more are being actively investigated.
\r\n\t\t\r\nHere, we solve two problems related to this topic. First, we present a general-purpose CRN-to-DNA compiler that can apply user-defined compilation schemes for translating formal CRNs to domain-level specifications for DNA molecules. In doing so, we develop a language in which such schemes can be concisely and precisely described. This compiler can greatly reduce the amount of tedious manual labor faced by researchers working in the field. Second, we present a general method for the formal verification of the correctness of such compilation. We first show that this problem reduces to testing a notion of behavioral equivalence between two CRNs, and then we construct a mathematical formalism in which that notion can be precisely defined. Finally, we provide algorithms for testing that notion. This verification process can be thought of as an equivalent of model checking in molecular computation, and we hope that the generality of our verification techniques will eventually allow us to apply them not only to DNA-based CRN implementations but to a wider class of molecular programs.
" }, { "name": "Fefferman, William Jason", "degree": "Masters", "year": "2011", "title": "On Quantum Computing and Pseudorandomness", "advisor": "Kitaev, Alexei; Umans, Christopher M.", "url": "https://resolver.caltech.edu/CaltechTHESIS:01312011-155543067", "creators": [ { "name": { "family": "Fefferman", "given": "William Jason" }, "id": "Fefferman-William-Jason", "display_name": "Fefferman, William Jason" } ], "advisors": [ { "name": { "family": "Kitaev", "given": "Alexei" }, "id": "Kitaev-A", "role": "advisor", "display_name": "Kitaev, Alexei" }, { "name": { "family": "Umans", "given": "Christopher M." }, "id": "Umans-C-M", "role": "advisor", "display_name": "Umans, Christopher M." } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/3Q00-DD64", "abstract": "The relationship between efficient verification and quantum computing is one of the most important and least well-understood questions in the theory of computation. In particular, is there a problem that can be solved efficiently on a quantum computer that cannot be verified? In this thesis we give evidence that BQP \u2284 PH, relating the classes of languages decidable with a quantum computer to a generalization of NP. In so doing we connect a question in pseudorandomness, first studied [BSW03] to the problem of finding an oracle relative to which BQP \u2284 PH. The primary technical challenge is to construct a unitary matrix, realized by an efficient quantum circuit and whose rows are supported on nearly disjoint subsets. Using this matrix and assuming the validity of the aforementioned question in pseudorandomness, we show an instantiation of the Nisan-Wigderson pseudorandom generator that can be broken with quantum computers, but not with the relevant mode of classical computation.\r\n" }, { "name": "Lin, Minghong", "degree": "Masters", "year": "2011", "title": "Algorithmic Issues in Green Data Centers", "advisor": "Wierman, Adam C.", "url": "https://resolver.caltech.edu/CaltechTHESIS:10262010-122247121", "creators": [ { "name": { "family": "Lin", "given": "Minghong" }, "id": "Lin-Minghong", "display_name": "Lin, Minghong" } ], "advisors": [ { "name": { "family": "Wierman", "given": "Adam C." }, "id": "Wierman-A-C", "role": "advisor", "display_name": "Wierman, Adam C." } ], "committee": [ { "name": { "family": "Uknown", "given": "Uknown" }, "display_name": "Uknown, Uknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/DBXG-1N54", "abstract": "Power consumption imposes a significant cost for data centers. Thus, it is not surprising that optimizing energy cost in data center is receiving increasing attention. In this thesis, we focus on the algorithmic issues at three levels of energy optimization for data centers: server level, local data center level and global data center level. At the server level, we analyze the common speed scaling algorithms in both worst-case model and stochastic model to answer some fundamental issues in the design of speed scaling algorithms. At the local data center level, we develop an online algorithm to make data center more power-proportional by dynamically adapting the number of active servers to match the current workload. At the global data center level, we propose a framework to explore the diversity of power prices and the diversity of propagation delays given geographically distributed data centers." }, { "name": "Liu, Zhenhua", "degree": "Masters", "year": "2011", "title": "Greening Geographical Load Balancing", "advisor": "Wierman, Adam C.; Low, Steven H.", "url": "https://resolver.caltech.edu/CaltechTHESIS:05252011-221926445", "creators": [ { "name": { "family": "Liu", "given": "Zhenhua" }, "id": "Liu-Zhenhua", "display_name": "Liu, Zhenhua" } ], "advisors": [ { "name": { "family": "Wierman", "given": "Adam C." }, "id": "Wierman-A-C", "role": "co-advisor", "display_name": "Wierman, Adam C." }, { "name": { "family": "Low", "given": "Steven H." }, "id": "Low-S-H", "role": "co-advisor", "display_name": "Low, Steven H." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/QGF7-4K56", "abstract": "Energy expenditure has become a significant fraction of data center operating costs. Recently, \"geographical load balancing\" has been suggested to reduce energy cost by exploiting the electricity price differences across regions. However, this reduction of cost can paradoxically increase total energy use. This work explores whether the geographical diversity of internet-scale systems can additionally be used to provide environmental gains.
\r\n\r\nWe first focus on geographical load balancing, which is modeled as a convex optimization problem. We derive two distributed algorithms for achieving optimal geographical load balancing and characterize the optimal solutions.
\r\n\r\nThen we continue to use the framework and algorithms to investigate whether geographical load balancing can encourage use of \"green\" renewable energy and reduce use of \"brown\" fossil fuel energy. Here we consider two approaches, namely, dynamic pricing and local renewables.
\r\n\r\nFor the dynamic pricing case, our numeric results show that if electricity is dynamically priced in proportion to the instantaneous fraction of the total energy that is brown, then geographical load balancing provides significant reductions in brown energy use. However, the benefits depend strongly on the degree to which systems accept dynamic energy pricing and the form of pricing used.
\r\n\r\nFor the local renewable case, we perform a trace-based study to evaluate three issues related to achieving this goal: the impact of geographical load balancing, the role of storage, and the optimal mix of\r\nrenewables. Our results highlight that geographical load balancing can significantly reduce the required capacity of renewable energy by using the energy more efficiently with \"follow the renewables\" routing. Further, our results show that small-scale storage can be useful, especially in combination with geographical load balancing, and that an optimal mix of renewables includes significantly more wind than photovoltaic solar.
" }, { "name": "de Goes, Fernando Ferrari", "degree": "Masters", "year": "2011", "title": "An Optimal Transport Approach to Robust Reconstruction and Simplification of 2D Shapes ", "advisor": "Desbrun, Mathieu", "url": "https://resolver.caltech.edu/CaltechTHESIS:05222011-165117683", "creators": [ { "name": { "family": "de Goes", "given": "Fernando Ferrari" }, "id": "de-Goes-Fernando-Ferrari", "display_name": "de Goes, Fernando Ferrari" } ], "advisors": [ { "name": { "family": "Desbrun", "given": "Mathieu" }, "id": "Desbrun-M", "role": "advisor", "display_name": "Desbrun, Mathieu" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/YKZF-VX90", "abstract": "We present a robust 2D shape reconstruction and simplification algorithm which takes as input a defect-laden point set with noise and outliers. We introduce an optimal-transport driven approach where the input point set, considered as a sum of Dirac measures, is approximated by a simplicial complex considered as a sum of uniform measures on 0- and 1-simplices. A fine-to-coarse scheme is devised to construct the resulting simplicial complex through greedy decimation of a Delaunay triangulation of the input point set. Our method performs well on a variety of examples ranging from line drawings to grayscale images, with or without noise, features, and boundaries." }, { "name": "Crane, Keenan Michael", "degree": "Masters", "year": "2010", "title": "Discrete Connections for Geometry Processing", "advisor": "Schroeder, Peter; Desbrun, Mathieu", "url": "https://resolver.caltech.edu/CaltechTHESIS:05282010-102307125", "creators": [ { "name": { "family": "Crane", "given": "Keenan Michael" }, "id": "Crane-Keenan-Michael", "display_name": "Crane, Keenan Michael" } ], "advisors": [ { "name": { "family": "Schroeder", "given": "Peter" }, "id": "Schr\u00f6der-P", "orcid": "0000-0002-0323-7674", "role": "co-advisor", "display_name": "Schroeder, Peter" }, { "name": { "family": "Desbrun", "given": "Mathieu" }, "id": "Desbrun-M", "orcid": "0000-0003-3424-6079", "role": "co-advisor", "display_name": "Desbrun, Mathieu" } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/SYF7-QD47", "abstract": "Connections provide a way to compare local quantities defined at different points of a geometric space. This thesis develops a discrete theory of connections that naturally leads to practical, efficient numerical algorithms for geometry processing. Our formulation is motivated by real-world applications where meshes may be noisy or coarsely discretized. Further, because our discrete framework closely parallels the smooth theory, we can draw upon a huge wealth of existing knowledge to develop and interpret mesh processing algorithms.
\r\n\r\nThe main contribution of this thesis is a new algorithm for computing trivial connections on discrete surfaces that are as smooth as possible everywhere but on a set of isolated singularities of given index. A connection is represented via an angle associated with each dual edge, i.e., a discrete angle-valued 1-form. These angles are determined by the solution to a linear system, and are globally optimal in the sense that they describe the trivial connection closest to Levi-Civita among all solutions with the prescribed set of singularities. Relative to previous methods our algorithm is surprisingly simple, and can be implemented using standard operations from mesh processing and linear algebra. The solution can be used to construct rotationally symmetric direction fields with a prescribed set of singularities and directional constraints, which are essential in applications such as quadrilateral remeshing and texture synthesis.
\r\n" }, { "name": "Florian, Mihai", "degree": "Masters", "year": "2010", "title": "SCALE: Source Code Analyzer for Locating Errors", "advisor": "Holzmann, Gerard J.; Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechTHESIS:04142010-122136677", "creators": [ { "name": { "family": "Florian", "given": "Mihai" }, "id": "Florian-Mihai", "display_name": "Florian, Mihai" } ], "advisors": [ { "name": { "family": "Holzmann", "given": "Gerard J." }, "id": "Holzmann-G-J", "role": "advisor", "display_name": "Holzmann, Gerard J." }, { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "co-advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/KXWA-7Y81", "abstract": "This thesis presents the design and implementation of SCALE, a tool for systematic software testing multi-threaded C applications that use the pthread library. SCALE exhaustively explores the non determinism introduced by thread schedulings and tries to find violations of safety properties. We have designed SCALE to be flexible so that it is easy to add and combine different exploration and state space reduction algorithms. In this thesis we describe the currently implemented reduction algorithms, of which the most important ones are local execution cycle detection and super step partial order reduction. To exemplify how SCALE can be used, we have applied it to a few multi-threaded applications, measured its performance and compared the results to those obtained by other tools. While checking the implementation of a non-blocking queuing algorithm, we were able to find a previously unknown bug that appears only in some unexpected thread inter-leavings." }, { "name": "Gojman, Benjamin", "degree": "Masters", "year": "2010", "title": "Algorithms and Techniques for Conquering Extreme Physical Variation in Bottom-Up Nanoscale Systems", "advisor": "Desbrun, Mathieu; DeHon, Andre", "url": "https://resolver.caltech.edu/CaltechTHESIS:04052010-152122284", "creators": [ { "name": { "family": "Gojman", "given": "Benjamin" }, "id": "Gojman-Benjamin", "display_name": "Gojman, Benjamin" } ], "advisors": [ { "name": { "family": "Desbrun", "given": "Mathieu" }, "id": "Desbrun-M", "role": "advisor", "display_name": "Desbrun, Mathieu" }, { "name": { "family": "DeHon", "given": "Andre" }, "id": "DeHon-A", "role": "co-advisor", "display_name": "DeHon, Andre" } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/BBC7-XK34", "abstract": "Nanowire building blocks provide a promising path to small feature size and thus the ability to more densely pack logic. However, the small feature size and novel, bottom-up manufacturing process will exhibit extreme variation and produce many devices that operate outside acceptable operating ranges. One-mapping-fits-all, prefabrication assignment of logical functions to physical transistors that exhibit high threshold variation will not work\u2014combining the wide range of physical variation in transistor threshold voltage with the wide range of fanouts in the design produces an unworkably large composite range of possible delays. Nonetheless, by carefully matching the fanout of each net to the physical threshold voltages of devices after fabrication, it is possible to reduce the net range of path delays sufficiently to achieve high system yield. Characterization of the complete threshold voltage distribution present in the system can be measured at a rate of 108 resources per second by augmenting the system with voltage comparison mechanisms. By adding a modest amount of extra resources, we achieve 100% yield for systems built out of devices with 38% variation, the ITRS prediction for threshold variation in 5 nm transistors. Moreover, for these systems, we maintain delay, energy and area close to the variation-free nominal case. What\u2019s more, there is only a 10% overhead when the measurement precision is limited to ten discrete threshold voltage values.\r\n" }, { "name": "Gopalakrishnan, Ragavendran", "degree": "Masters", "year": "2010", "title": "An Architectural View of Game Theoretic Control", "advisor": "Wierman, Adam C.", "url": "https://resolver.caltech.edu/CaltechTHESIS:05272010-163702257", "creators": [ { "name": { "family": "Gopalakrishnan", "given": "Ragavendran" }, "id": "Gopalakrishnan-Ragavendran", "display_name": "Gopalakrishnan, Ragavendran" } ], "advisors": [ { "name": { "family": "Wierman", "given": "Adam C." }, "id": "Wierman-A-C", "role": "advisor", "display_name": "Wierman, Adam C." } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/ZW5K-AF41", "abstract": "Resource allocation has long been a fundamental research problem across several disciplines. While traditional approaches to this problem were centralized, recent research has focussed on distributed solutions for resource allocation, for reasons of scalability, reliability and efficiency in many real-world applications. Game-theoretic control is a promising new approach for distributed resource allocation. In this thesis, we describe how game-theoretic control can be viewed as having an intrinsic layered architecture, which provides a modularization that simplifies the control design. We illustrate this architectural view by presenting details about one particular instantiation using potential games as an interface. This example serves to highlight the strengths and limitations of the proposed architecture while also illustrating the relationship between game-theoretic control and other existing approaches to distributed resource allocation. We also demonstrate the power of this approach by reformulating the power control problem in sensor networks as a game-theoretic control problem in the potential games instantiation of our framework. This allows us to relax several assumptions made by previous contributions, and consider more complex objective functions." }, { "name": "Liu, Annie Hsin-Wen", "degree": "Masters", "year": "2010", "title": "Simulation and Implementation of Distributed Sensor Network for Radiation Detection", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechTHESIS:07072010-160100413", "creators": [ { "name": { "family": "Liu", "given": "Annie Hsin-Wen" }, "id": "Liu-Annie-Hsin-Wen", "display_name": "Liu, Annie Hsin-Wen" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/XF1E-XW61", "abstract": "The problem of monitoring and searching for threats that involve radiological weapons is extremely challenging because of he high variance in background radiation, the presence of benign sources and possible shielding on harmful sources. We present in this thesis a collection of algorithms and analysis that center around the problem of radiation detection with a distributed sensor network. We studied the basic characteristics of a radiation sensor network and focused on the tradeoffs between false positive rate, true positive rate, and time to detect one or more radiation sources in a large area. Three major results came out from this thesis work. First of all, we developed a simulation platform modified from multiplayer game engine that is capable of simulating realistic data in highly dynamic environments. Secondly, we provided mathematical and simulation analyses regarding critical system parameters such the number of sensors, sensor placement, and sensor placement. We also introduced a robust data fusion and parameter estimation method based on Bayesian framework. Lastly, we described an initial work to construct a ground mobile sensor for indoor search and surveillance purposes." }, { "name": "Buchfuhrer, David Isaac", "degree": "Masters", "year": "2008", "title": "The Complexity of Formula Minimization", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-05292008-183055", "creators": [ { "name": { "family": "Buchfuhrer", "given": "David Isaac" }, "id": "Buchfuhrer-David-Isaac", "display_name": "Buchfuhrer, David Isaac" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/9T9K-4394", "abstract": "The Minimum Equivalent Expression problem is a natural optimization problem in the second level of the Polynomial-Time Hierarchy. It has long been conjectured to be \u03a32-complete and indeed appears as an open problem in Garey and Johnson. The depth-2 variant was only shown to be \u03a32-complete in 1998, and even resolving the complexity of the depth-3 version has been mentioned as a challenging open problem. We prove that the depth-k version is \u03a32-complete under Turing reductions for all k >= 3. We also settle the complexity of the original, unbounded depth Minimum Equivalent Expression problem, by showing that it too is \u03a32-complete under Turing reductions.
\r\n\r\nWe also consider a three-level model in which the third level is composed of parity gates, called SPPs. SPPs allow for small representations of Boolean functions and have efficient heuristics for minimization. However, little has been known about the complexity of SPP minimization. Here, we show that SPP minimization is \u03a32-complete under Turing reductions.
" }, { "name": "Noblet, David Alexander", "degree": "Masters", "year": "2008", "title": "MojaveComm: a View-Oriented Group Communication Protocol with Support for Virtual Synchrony", "advisor": "Hickey, Jason J.", "url": "https://resolver.caltech.edu/CaltechETD:etd-06042008-113805", "creators": [ { "name": { "family": "Noblet", "given": "David Alexander" }, "id": "Noblet-David-Alexander", "display_name": "Noblet, David Alexander" } ], "advisors": [ { "name": { "family": "Hickey", "given": "Jason J." }, "id": "Hickey-J-J", "role": "advisor", "display_name": "Hickey, Jason J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/M69B-WB70", "abstract": "In this thesis, we explore the feasibility of implementing a general communication protocol that addresses common classes of problems that one encounters in the development of distributed applications, such as: multipoint-to-multipoint communication, message (re)ordering, mutual exclusion, and consensus. The paper details both the design and implementation of MojaveComm, a view-oriented total-order group communication protocol suitable for deployment on wide-area networks. Moreover, we provide a high-level overview of MojaveFS, a sequentially consistent distributed filesystem, and show how we can use the message-ordering guarantees of MojaveComm as the basis for the implementation of its sequential consistency guarantees." }, { "name": "White, Jerome S.", "degree": "Masters", "year": "2008", "title": "Receive Buffer Dynamics and OS Scheduling", "advisor": "Hickey, Jason J.", "url": "https://resolver.caltech.edu/CaltechETD:etd-02082008-131148", "creators": [ { "name": { "family": "White", "given": "Jerome S." }, "id": "White-Jerome-S", "display_name": "White, Jerome S." } ], "advisors": [ { "name": { "family": "Hickey", "given": "Jason J." }, "id": "Hickey-J-J", "role": "advisor", "display_name": "Hickey, Jason J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/ZTYH-6B13", "abstract": "We perform an empirical study of the effects receive-side resource sharing has on a TCP transaction. Our variable of focus is the buffer used to deliver packets to the application. Specifically, our interest lies with how its size affects throughput amidst background load." }, { "name": "Yang, Weiwei", "degree": "Masters", "year": "2008", "title": "Discrete Mechanical Interpolation of Keyframes", "advisor": "Desbrun, Mathieu", "url": "https://resolver.caltech.edu/CaltechETD:etd-12312007-012842", "creators": [ { "name": { "family": "Yang", "given": "Weiwei" }, "id": "Yang-Weiwei", "display_name": "Yang, Weiwei" } ], "advisors": [ { "name": { "family": "Desbrun", "given": "Mathieu" }, "id": "Desbrun-M", "role": "advisor", "display_name": "Desbrun, Mathieu" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/A1Y4-9054", "abstract": "Advances in computer hardware and software have made it possible to use physical simulation methods to add unprecedented degrees of realism to computer animations. Unfortunately, the reliance on such methods makes it difficult or even impossible to control the results in order to achieve artistic goals. We present a method for allowing artistic control of physical realism by interpolating between given keyframes. The method is based on the discrete Lagrange-d'Alembert principle; we introduce additional \"ghost forces\" that are calculated to bring the system into the configuration requested by the artist. We derive a cost function that when minimized ensures the corresponding motion to be smooth and physical looking. We describe the implementation and show an example of animating a multi-particle mass-spring system in 3D using our method." }, { "name": "Hu, Cheng", "degree": "Masters", "year": "2007", "title": "Concurrent System Design Using Flow", "advisor": "Low, Steven H.", "url": "https://resolver.caltech.edu/CaltechETD:etd-05252007-140855", "creators": [ { "name": { "family": "Hu", "given": "Cheng" }, "id": "Hu-Cheng", "display_name": "Hu, Cheng" } ], "advisors": [ { "name": { "family": "Low", "given": "Steven H." }, "id": "Low-S-H", "role": "advisor", "display_name": "Low, Steven H." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/HPA7-2B52", "abstract": "We define a formal model for concurrent systems named Flow. The goal of this formal model is to be both practical in allowing users to build the types of concurrent systems they want to build in real life and practical in allowing users to quickly prove correctness properties about the systems they build.
\r\n\r\nWe define the model formally as the asynchronous product of extended state automata. Extended state automata and their asynchronous products are used to define other modeling languages as well, such as the state space exploration verification tool SPIN. Thus an offshoot of our formal definition is that we see it would not be difficult to use automated verification tools to verify Flow model properties.
\r\n\r\nUsing the formal definition, we show a set of theorems that users will be able to reuse to prove correctness properties about Flow models. One category of theorems deals with showing and constructing Flow models for which all executions are guaranteed to be finite. Another category of theorems deals with showing or constructing Flow models for which all executions from a start state are guaranteed to have the same end state. This is useful because it allows users to know how all concurrent executions from a start state terminate by looking at just one execution. Another category of theorems deals with dividing complex Flow models into smaller sub-models, and showing the properties of the full model by showing the properties of the sub-models, allowing for a divide and conquer strategy to be used with Flow model proofs. The last category deals with using Hoare triples to prove properties about all executions from a set of possible start states as characterized by some pre-condition by proving properties about a set of representative executions from those start states. In the best case, we can use a combination of these techniques to show that all executions of a Flow model with start states that satisfy some pre-condition have end states that satisfy some post-condition by considering just one feasible execution of the model.
" }, { "name": "McKenzie, Alexander George", "degree": "Masters", "year": "2007", "title": "HOLA: a High-Order Lie Advection of Discrete Differential Forms With Applications in Fluid Dynamics", "advisor": "Desbrun, Mathieu", "url": "https://resolver.caltech.edu/CaltechETD:etd-05292007-100432", "creators": [ { "name": { "family": "McKenzie", "given": "Alexander George" }, "id": "McKenzie-Alexander-George", "display_name": "McKenzie, Alexander George" } ], "advisors": [ { "name": { "family": "Desbrun", "given": "Mathieu" }, "id": "Desbrun-M", "role": "advisor", "display_name": "Desbrun, Mathieu" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/0TJH-M778", "abstract": "The Lie derivative, and Exterior Calculus in general, is ubiquitous in the elegant geometric interpretation of many dynamical systems. We extend recent trends towards a Discrete Exterior Calculus by introducing a discrete framework for the Lie derivative defined on differential forms, including a WENO based numerical scheme for its implementation. The usefulness of this operator is demonstrated through the advection of scalar and vector valued fields (arbitrary discrete k-forms) in a desirable intrinsic and metric independent fashion. Examples include Lie advection of fluid flow vorticity, and we conclude with a significant discussion on the conservative Lie advection of fluid mass density for robust free surface flows in computer graphics." }, { "name": "Mullen, Patrick Gary", "degree": "Masters", "year": "2007", "title": "A Variational Approach to Eulerian Geometry Processing of Surfaces and Foliations", "advisor": "Desbrun, Mathieu", "url": "https://resolver.caltech.edu/CaltechETD:etd-05212007-160139", "creators": [ { "name": { "family": "Mullen", "given": "Patrick Gary" }, "id": "Mullen-Patrick-Gary", "display_name": "Mullen, Patrick Gary" } ], "advisors": [ { "name": { "family": "Desbrun", "given": "Mathieu" }, "id": "Desbrun-M", "role": "advisor", "display_name": "Desbrun, Mathieu" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/Q51A-W257", "abstract": "We present a purely Eulerian framework for geometry processing of surfaces and foliations. Contrary to current Eulerian methods used in graphics, we use conservative methods and a variational interpretation, offering a unified framework for routine surface operations such as smoothing, offsetting, and animation. Computations are performed on a fixed volumetric grid without recourse to Lagrangian techniques such as triangle meshes, particles, or path tracing. At the core of our approach is the use of the Coarea Formula to express area integrals over isosurfaces as volume integrals. This enables the simultaneous processing of multiple isosurfaces, while a single interface can be treated as the special case of a dense foliation. We show that our method is a powerful alternative to conventional geometric representations in delicate cases such as the handling of high-genus surfaces, weighted offsetting, foliation smoothing of medical datasets, and incompressible fluid animation." }, { "name": "Pilotto, Concetta", "degree": "Masters", "year": "2007", "title": "Local-to-Global in Multi-Agent Systems", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechETD:etd-05232007-084106", "creators": [ { "name": { "family": "Pilotto", "given": "Concetta" }, "id": "Pilotto-Concetta", "display_name": "Pilotto, Concetta" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/JY2K-6194", "abstract": "The thesis presents performance analysis and simulation results for algorithms that compute global functions out of local interactions on multi-agent systems. We focus on optimization problems; this is because many problems can be formulated in terms of designing algorithms which optimize some global function subject to local constraints.
\r\n\r\nWe model the environment as an adversary of the system. The environment is able to attack the system, modifying the system in arbitrary ways: some agents and/or communication links can be disabled.
\r\n\r\nComputations proceed by opportunistically employing the resources available at each point, progressing rapidly when more resources are available and slowing down when resources become unavailable.
\r\n\r\nWe investigate and compare two techniques. In the first one, each sub-system (which we call group) behaves like a centralized system, i.e., it solves its specific optimization sub-problem by applying a central algorithm. We investigate this technique, called self-similarity, showing examples where it works and where it fails, and carry out performance analysis on some problems. Then, we introduce a second technique which is completely decentralized but synchronous: agents simultaneously makes a local update to their current estimates of some true parameter using the estimates of their adjacents. We prove the correctness of this technique on some specific problems by applying tools from distributed systems (variant functions) and control theory (equilibrium points of a dynamical system).
" }, { "name": "Capponi, Agostino", "degree": "Masters", "year": "2006", "title": "Estimation Problems in Sense and Respond Systems", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechETD:etd-05222006-142127", "creators": [ { "name": { "family": "Capponi", "given": "Agostino" }, "id": "Capponi-Agostino", "orcid": "0000-0001-9735-7935", "display_name": "Capponi, Agostino" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/YZF9-ZN10", "abstract": "In this thesis we study problems arising in the design of sense and respond systems and present analytical solutions to them as well as results from experiments dealing with real systems. Sense and respond systems employ sensors and other sources of data to sense what is happening in their environments, process the obtained information, and respond appropriately. A goal of the processing stage is to reconstruct the best possible estimate of the state of the environment using messages received from sensors. Due to the large number of messages that need to be processed, it is desirable to have algorithms that can incrementally process the received measurements and recover the state. The state estimation process becomes more problematic if measurements obtained from the sensors are noisy or they are sent at unpredictable times. First, we study models of state estimation and present algorithms that can incrementally compute accurate linear state estimates of the surrounding environment. Second, we define a framework called predicate signaling that allows us to make tradeoffs between message generation rates and the quality of the state estimate through specification of suitable predicates. We show how predicate signaling generalizes commonly used signaling schemes and present a detailed analysis based on stochastic processes to evaluate schemes based on predicate signaling." }, { "name": "Kalyanaraman, Shankar", "degree": "Masters", "year": "2006", "title": "On Obtaining Pseudorandomness from Error-Correcting Codes", "advisor": "Umans, Christopher M.", "url": "https://resolver.caltech.edu/CaltechETD:etd-06022006-170858", "creators": [ { "name": { "family": "Kalyanaraman", "given": "Shankar" }, "id": "Kalyanaraman-Shankar", "display_name": "Kalyanaraman, Shankar" } ], "advisors": [ { "name": { "family": "Umans", "given": "Christopher M." }, "id": "Umans-C-M", "role": "advisor", "display_name": "Umans, Christopher M." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/64AT-E090", "abstract": "Constructing pseudorandom objects based on codes has been the focus of some recent research. These constructions were based on specific algebraic codes and were rather simple in their structure in that a random index into a codeword was picked and $m$ subsequent symbols output. In this work, we explore the question of whether it is possible to extend the scope of application of this paradigm of constructions to larger families of codes.
\r\n\r\nWe show in this work that there exist such pseudorandom objects based on cyclic, linear codes that fool linear tests. When restricted to just algebraic codes, our techniques yield constructions that fool low-degree tests. Specifically, our results show that Reed-Solomon codes can be used to obtain pseudorandom objects, albeit in a weakened form. To the best of our knowledge, this is the first instance of Reed-Solomon codes being used to this effect.
\r\n\r\nIn the process, we also touch upon one of the holy grails of derandomization. It should come as no surprise that pseudorandom objects that fool low-degree tests are automatically correlated to derandomizing polynomial identity testing. We look at whether our constructions are general enough to answer this important question and while we come up short in our endeavor, we believe our approach adds a new perspective to this problem and hopefully a meaningful opening to solving it.
" }, { "name": "Kapre, Nachiket Ganesh", "degree": "Masters", "year": "2006", "title": "Packet-Switched On-Chip FPGA Overlay Networks", "advisor": "DeHon, Andre", "url": "https://resolver.caltech.edu/CaltechETD:etd-05312006-164059", "creators": [ { "name": { "family": "Kapre", "given": "Nachiket Ganesh" }, "id": "Kapre-Nachiket-Ganesh", "orcid": "0000-0002-2187-0406", "display_name": "Kapre, Nachiket Ganesh" } ], "advisors": [ { "name": { "family": "DeHon", "given": "Andre" }, "id": "DeHon-A", "role": "advisor", "display_name": "DeHon, Andre" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/8NFZ-4Y29", "abstract": "As we scale to larger chip capacities, it becomes possible to map large, concurrent applications to programmable fabrics. These applications often have irregular and dynamic communication requirements. Packet-switched networks provide efficient implementations for such applications on these fabrics. In this research, we show how to engineer high-performance packet-switched on-chip networks and provide quantitative comparisons between different kinds of these networks. We analyse different network topologies and justify selection of topologies based on experimental results. We investigate packet-switched and time-multiplexed styles of routing and provide guidance on which style is appropriate for which application." }, { "name": "Kharevych, Liliya", "degree": "Masters", "year": "2006", "title": "Circle Patterns Documentation 1.0 [Supplemental material for Masters thesis: Implementation of circle pattern parameterization (2006)] -- GO TO RELATED URL FOR FILES", "advisor": "Schroeder, Peter", "url": "https://resolver.caltech.edu/CaltechBLOB:etd-05242006-224103.1", "creators": [ { "name": { "family": "Kharevych", "given": "Liliya" }, "id": "Kharevych-Liliya", "display_name": "Kharevych, Liliya" } ], "advisors": [ { "name": { "family": "Schroeder", "given": "Peter" }, "id": "Schr\u00f6der-P", "orcid": "0000-0002-0323-7674", "role": "advisor", "display_name": "Schroeder, Peter" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/JM7X-3T10", "abstract": "THIS RECORD IS NO LONGER ACTIVE -- GO TO RELATED URL FOR FILES" }, { "name": "Kharevych, Liliya", "degree": "Masters", "year": "2006", "title": "Implementation of Circle Pattern Parameterization", "advisor": "Schroeder, Peter", "url": "https://resolver.caltech.edu/CaltechETD:etd-05242006-224103", "creators": [ { "name": { "family": "Kharevych", "given": "Liliya" }, "id": "Kharevych-Liliya", "display_name": "Kharevych, Liliya" } ], "advisors": [ { "name": { "family": "Schroeder", "given": "Peter" }, "id": "Schr\u00f6der-P", "orcid": "0000-0002-0323-7674", "role": "advisor", "display_name": "Schroeder, Peter" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/PC38-GT79", "abstract": "Circle Pattern is a novel method for the construction of discrete conformal mappings from surface meshes of arbitrary topology to the plane. This approach is based on representing mesh as arrangements of circles \u2013 one for each face \u2013 with prescribed intersection angles. Given these angles the circle radii follow as the unique minimizer of a convex energy. The method supports very flexible boundary conditions ranging from free boundaries to control of the boundary shape via prescribed curvatures. Closed meshes of genus zero can be parameterized over the sphere. To parameterize higher genus meshes we introduce cone singularities at designated vertices. The parameter domain is then a piecewise Euclidean surface. Cone singularities can also help to reduce the often very large area distortion of global conformal maps to moderate levels. Our method involves two optimization problems: a quadratic program and the unconstrained minimization of the circle pattern energy. The latter is a convex function of logarithmic radius variables with simple explicit expressions for gradient and Hessian. In this paper we demonstrate implementation details and possible extensions to the Circle Pattern method." }, { "name": "Khorlin, Andrey", "degree": "Masters", "year": "2006", "title": "Scheduling in Distributed Stream Processing Systems", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechETD:etd-05242006-175006", "creators": [ { "name": { "family": "Khorlin", "given": "Andrey" }, "id": "Khorlin-Andrey", "display_name": "Khorlin, Andrey" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/4MH9-9104", "abstract": "Stream processing systems receive continuous streams of messages with relatively raw information and produce streams of messages with processed information. The utility of a stream-processing system depends, in part, on the accuracy and timeliness of the output. Streams in complex event processing systems are processed on distributed systems; several steps are taken on different processors to process each incoming message, and messages may be enqueued between steps. This work explores the problem of distributed dynamic control of streams to optimize the total utility provided by the system. A system can be controlled using central control or distributed control. In the former case a single central controller maintains the state of the entire system and controls the operation of all processors. In distributed control systems, each processor controls itself based on its state and information from other processors. A challenge of distributed control is that timeliness of output depends only on the total end-to-end time and is otherwise independent of the delays at each separate processor whereas the controller for each processor takes action to control only the steps on that processor and cannot directly control the entire network. In this work, we discuss a framework for design and analysis of the control-based scheduling algorithms for a distributed stream processing system and illustrate our framework with two concrete scheduling algorithms." }, { "name": "Mehta, Nikil", "degree": "Masters", "year": "2006", "title": "Time-Multiplexed FPGA Overlay Networks on Chip", "advisor": "DeHon, Andre", "url": "https://resolver.caltech.edu/CaltechETD:etd-05312006-164103", "creators": [ { "name": { "family": "Mehta", "given": "Nikil" }, "id": "Mehta-Nikil", "display_name": "Mehta, Nikil" } ], "advisors": [ { "name": { "family": "DeHon", "given": "Andre" }, "id": "DeHon-A", "role": "advisor", "display_name": "DeHon, Andre" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/WZTS-XR26", "abstract": "How do we design a communication network for processing elements (PEs) on a single chip that minimizes application communication time and area? In designing such a network it is essential to use a network communication pattern that matches application communication and area requirements. This report characterizes the design space of a particular communication pattern for networks on chip: Time-Multiplexed Interconnect. In contrast to more commonly used packet-switched networks, which route communication dynamically, time-multiplexed networks schedule all possible communication prior to runtime with an offline router. We describe how to build well engineered, highly scalable time-multiplexed FPGA networks in terms of topology selection, routing algorithm design and hardware design that operate on a Xilinx XC2V6000-4 at 166MHz. To benchmark our networks we use real, communication rich applications instead of generating synthetic traffic. We show that over all areas (10K\u201310M slices) and over all applications the best \"one topology fits all\" is Butterfly Fat Tree (BFT) with c = 1, p = 0.5, which requires, in the worst case, 6.1x as many cycles to route communication than the optimal topology. We compare time-multiplexing to packet-switching, and show that on average, over all applications for all equivalent topologies, online packet-switched communication requires 1.5x as many cycles to route as offline time-multiplexed scheduling. When applying designs to equivalent area, for areas <100K slices packet-switching typically outperforms time-multiplexing, but at >100K slices packet-switching requires up to 3.4x as many cycles to route as time-multiplexing in the worst case. Finally, for equivalent, large networks (>100 PEs) time-multiplexing outperforms packet-switching for communication loads where greater than 10% of all logical links are active. This demonstrates that well designed time-multiplexed FPGA overlay networks can deliver performance and area efficiency exceeding that of packet-switched networks." }, { "name": "Pongsajapan, John", "degree": "Masters", "year": "2006", "title": "Optimization and Stability of TCP/IP with Delay-Sensitive Utility Functions", "advisor": "Low, Steven H.", "url": "https://resolver.caltech.edu/CaltechETD:etd-06022006-162638", "creators": [ { "name": { "family": "Pongsajapan", "given": "John" }, "id": "Pongsajapan-John", "display_name": "Pongsajapan, John" } ], "advisors": [ { "name": { "family": "Low", "given": "Steven H." }, "id": "Low-S-H", "role": "advisor", "display_name": "Low, Steven H." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/262Z-0J78", "abstract": "TCP/IP can be interpreted as a distributed primal-dual algorithm to maximize aggregate utility over source rates. It has recently been shown that an equilibrium of TCP/IP, if exists, maximize the same aggregate utility function over both source rates and routes, provided pure congestion prices are used as link costs in the shortest-path calculation of IP. Moreover, the utility functions are delay-insensitive, i.e., they are functions of rates only. We extend this result in several ways.
\r\n\r\nFirst, we show that if utility functions are delay-insensitive, then there are networks for which TCP/IP optimizes aggregate utility only if routing is based on pure congestion prices. Routing based on the weighted sum of congestion prices and propagation delays optimizes aggregate utility for general networks only if the utility functions are delay-sensitive. Moreover, we identify such a class of delay-sensitive utility functions that is implicitly optimized by TCP/IP. As for the delay-insensitive case, we show for this class of utility functions, equilibrium of TCP/IP exists if and only if the optimization problem has zero duality gap. In that case, there is no penalty for not splitting the traffic. We exhibit some counter-intuitive properties of this class of utility functions. We also prove that any class of delay-sensitive utility functions that are optimized by TCP/IP necessarily possess some strange properties.
\r\n\r\nWe prove that, for general networks, if the weight on congestion prices is small enough, only minimum-propagation-delay paths are selected. Hence if all source-destination pairs have unique minimum-propagation-delay paths, then equilibrium of TCP/IP exists and is asymptotically stable. For general networks, their equilibrium properties are the same as a modified network where paths with non-minimum propagation delays are deleted and routing is based on pure congestion prices.
\r\n\r\nIt is commonly believed that there is generally an inevitable tradeoff between utility maximization and stability in TCP/IP networks. In particular, as the weight on congestion prices increases, the routing will change from stable to unstable. We exhibit a counterexample where routing changes from stable to unstable and then to stable again, as the weight on congestion prices increases. Moreover, one can construct a network with any given utility profile as a function of the weight on congestion prices.
" }, { "name": "Tian, Lu", "degree": "Masters", "year": "2006", "title": "Resource Allocation in Streaming Environments", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechETD:etd-05262006-165801", "creators": [ { "name": { "family": "Tian", "given": "Lu" }, "id": "Tian-Lu", "display_name": "Tian, Lu" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/35Y5-H853", "abstract": "The proliferation of the Internet and sensor networks has fueled the development of applications that process, analyze, and react to continuous data streams in a near-real-time manner. Examples of such stream applications include network traffic monitoring, intrusion detection, financial services, large-scale reconnaissance, and surveillance.
\r\n\r\nUnlike tasks in traditional scheduling problems, these stream processing applications are interacting repeating tasks, where iterations of computation are triggered by the arrival of new inputs. Furthermore, these repeated tasks are elastic in the quality of service, and the economic value of a computation depends on the time taken to execute it; for example, an arbitrage opportunity can disappear in seconds. Given limited resources, it is not possible to process all streams without delay. The more resource available to a computation, the less time it takes to process the input, and thus the more value it generates. Therefore, efficiently utilizing a network of limited distributed resources to optimize the net economic value of computations forms a new paradigm in the well-studied field of resource allocation.
\r\n\r\nWe propose using a new performance model and resource reservation system as the solution space, and present two scheduling/resource allocation heuristics for processing streams in a distributed heterogenous computing environment to optimize economic value. Both heuristics are based on market mechanisms; one uses a centralized market and the other decentralized markets. We prove bounds on performance and present measurements to show that the performances of these two heuristics are near-optimal and significantly better than straightforward load-balancing heuristics.
" }, { "name": "Elcott, Sharif Mohamed", "degree": "Masters", "year": "2005", "title": "Discrete, Circulation-Preserving, and Stable Simplicial Fluids", "advisor": "Schroeder, Peter", "url": "https://resolver.caltech.edu/CaltechETD:etd-05272005-135652", "creators": [ { "name": { "family": "Elcott", "given": "Sharif Mohamed" }, "id": "Elcott-Sharif-Mohamed", "display_name": "Elcott, Sharif Mohamed" } ], "advisors": [ { "name": { "family": "Schroeder", "given": "Peter" }, "id": "Schr\u00f6der-P", "orcid": "0000-0002-0323-7674", "role": "advisor", "display_name": "Schroeder, Peter" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/D68G-5532", "abstract": "Visual quality, low computational cost, and numerical stability are foremost goals in computer animation. An important ingredient in achieving these goals is the conservation of fundamental motion invariants. For example, rigid and deformable body simulation has benefited greatly from conservation of linear and angular momenta. In the case of fluids, however, none of the current techniques focuses on conserving invariants, and consequently they often introduce a visually disturbing numerical diffusion of vorticity. Visually just as important is the resolution of complex simulation domains. Doing so with regular (even if adaptive) grid techniques can be computationally delicate.
\r\n\r\nIn this thesis we describe a novel technique for the simulation of fluid flows. It is designed to respect the defining differential properties, i.e., the conservation of circulation along arbitrary loops as they are transported by the flow. Consequently, our method offers several new and desirable properties: (1) arbitrary simplicial meshes (triangles in 2D, tetrahedra in 3D) can be used to define the fluid domain; (2) the computations are efficient due to discrete operators with small support; (3) the method is stable for arbitrarily large time steps; (4) it preserves discrete circulation avoiding numerical diffusion of vorticity; and (5) its implementation is straightforward.
" }, { "name": "Gray, Nathaniel Asoka", "degree": "Masters", "year": "2005", "title": "High-Confidence, Modular Compiler Development in a Formal Environment", "advisor": "Hickey, Jason J.", "url": "https://resolver.caltech.edu/CaltechETD:etd-05272005-182952", "creators": [ { "name": { "family": "Gray", "given": "Nathaniel Asoka" }, "id": "Gray-Nathaniel-Asoka", "display_name": "Gray, Nathaniel Asoka" } ], "advisors": [ { "name": { "family": "Hickey", "given": "Jason J." }, "id": "Hickey-J-J", "role": "advisor", "display_name": "Hickey, Jason J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/RBAD-VH06", "abstract": "We present a methodology for realistic compiler development in an existing formal methods framework. Program transformations and analyses are implemented as term rewrites and inference rules, and automated proof search techniques are used to drive the compilation process. This approach allows the programmer to implement the compiler succinctly, declaratively, and modularly. We explain how our methodology separates trusted code, which can potentially corrupt compilation, from untrusted code, which cannot. We present a case study in which we have used these techniques to implement a compiler for a small ML-like programming language that produces x86 assembly code as output. We give a detailed overview of several stages of the compiler, including type inference, type checking, type erasure, CPS conversion, and closure conversion. We also describe the process of extending the minimal core compiler to include features such as integers, Booleans, operators, tuples, and recursive functions." }, { "name": "Lin, Hsuan-Tien", "degree": "Masters", "year": "2005", "title": "Infinite Ensemble Learning with Support Vector Machines ", "advisor": "Abu-Mostafa, Yaser S.", "url": "https://resolver.caltech.edu/CaltechETD:etd-05262005-030549", "creators": [ { "name": { "family": "Lin", "given": "Hsuan-Tien" }, "id": "Lin-Hsuan-Tien", "orcid": "0000-0003-2968-0671", "display_name": "Lin, Hsuan-Tien" } ], "advisors": [ { "name": { "family": "Abu-Mostafa", "given": "Yaser S." }, "id": "Abu-Mostafa-Y-S", "role": "advisor", "display_name": "Abu-Mostafa, Yaser S." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/E03R-EN93", "abstract": "Ensemble learning algorithms such as boosting can achieve better performance by averaging over the predictions of base learners. However, existing algorithms are limited to combining only a finite number of base learners, and the generated ensemble is usually sparse. It is not clear whether we should construct an ensemble classifier with a larger or even an infinite number of base learners.
\r\n\r\nIn addition, constructing an infinite ensemble itself is a challenging task. In this paper, we formulate an infinite ensemble learning framework based on SVM. The framework could output an infinite and nonsparse ensemble, and can be applied to construct new kernels for SVM as well as to interpret existing ones. We demonstrate the framework with a concrete application, the stump kernel, which embodies infinitely many decision stumps. The stump kernel is simple, yet powerful.
\r\n\r\nExperimental results show that SVM with the stump kernel usually achieves better performance than boosting, even with noisy data.
\r\n" }, { "name": "Naeimi, Helia", "degree": "Masters", "year": "2005", "title": "A Greedy Algorithm for Tolerating Defective Crosspoints in NanoPLA Design", "advisor": "DeHon, Andre", "url": "https://resolver.caltech.edu/CaltechETD:etd-05052005-164226", "creators": [ { "name": { "family": "Naeimi", "given": "Helia" }, "id": "Naeimi-Helia", "display_name": "Naeimi, Helia" } ], "advisors": [ { "name": { "family": "DeHon", "given": "Andre" }, "id": "DeHon-A", "role": "advisor", "display_name": "DeHon, Andre" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/Z5AS-8A57", "abstract": "Recent developments suggest both plausible fabrication techniques and viable architectures for building sublithographic Programmable Logic Arrays using molecular-scale wires and switches. Designs at this scale will see much higher defect rates than in conventional lithography. However, these defects need not be an impediment to programmable logic design at this scale.
\r\n\r\nWe introduce a strategy for tolerating defective crosspoints in PLA architecture. We develop a linear-time, greedy algorithm for mapping PLA logic around crosspoint defects. The mapping algorithm matches the PLA logic to the defect configuration of each device.
\r\n\r\nWe note that P-term fanin must be bounded to guarantee low overhead mapping and develop analytical guidelines for bounding fanin. We further quantify analytical and empirical mapping overhead rates. Including fanin bounding, our greedy mapping algorithm maps a large set of benchmark designs with 13% average overhead for random junction defect rates as high as 20%.
" }, { "name": "Prakash, Piyush", "degree": "Masters", "year": "2005", "title": "Slack Matching", "advisor": "Martin, Alain J.", "url": "https://resolver.caltech.edu/CaltechETD:etd-05272005-134017", "creators": [ { "name": { "family": "Prakash", "given": "Piyush" }, "id": "Prakash-Piyush", "display_name": "Prakash, Piyush" } ], "advisors": [ { "name": { "family": "Martin", "given": "Alain J." }, "id": "Martin-A-J", "role": "advisor", "display_name": "Martin, Alain J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/g43p-hv51", "abstract": "In this thesis we present a method for slack matching asynchronous circuits, described as a collection of handshaking expansions. We present an execution model for a restricted class of HSE. We define the number of messages that a process contains. The static slack, dynamic slack and dynamic threshold are defined. We state sufficient conditions under which the dynamic slack of a pipeline of half-buffers is the sum of that of the processes comprising the pipeline. The slack matching problem is formulated as that of ensuring that all pipelines and rings in a system can simultaneously contain a number of messages that is no less than the dynamic threshold but no greater than the dynamic slack. We describe an algorithm to formulate the slack matching problem as a mixed integer linear program." }, { "name": "deLorimier, Michael John", "degree": "Masters", "year": "2005", "title": "Floating-Point Sparse Matrix-Vector Multiply for FPGAs", "advisor": "DeHon, Andre", "url": "https://resolver.caltech.edu/CaltechETD:etd-05132005-144347", "creators": [ { "name": { "family": "deLorimier", "given": "Michael John" }, "id": "deLorimier-Michael-John", "display_name": "deLorimier, Michael John" } ], "advisors": [ { "name": { "family": "DeHon", "given": "Andre" }, "id": "DeHon-A", "role": "advisor", "display_name": "DeHon, Andre" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/FCCD-FA51", "abstract": "Large, high density FPGAs with high local distributed memory bandwidth surpass the peak floating-point performance of high-end, general-purpose processors. Microprocessors do not deliver near their peak floating-point performance on efficient algorithms that use the Sparse Matrix-Vector Multiply (SMVM) kernel. In fact, microprocessors rarely achieve 33% of their peak floating-point performance when computing SMVM. We develop and analyze a scalable SMVM implementation on modern FPGAs and show that it can sustain high throughput, near peak, floating-point performance. Our implementation consists of logic design as well as scheduling and data placement techniques. For benchmark matrices from the Matrix Market Suite we project 1.5 double precision Gflops/FPGA for a single VirtexII-6000-4 and 12 double precision Gflops for 16 Virtex IIs (750 Mflops/FPGA). We also analyze the asymptotic efficiency of our architecture as parallelism scales using a constant rent-parameter matrix model. This demonstrates that our data placement techniques provide an asymptotic scaling benefit.
\r\n\r\nWhile FPGA performance is attractive, higher performance is possible if we re-balance the hardware resources in FPGAs with embedded memories. We show that sacrificing half the logic area for memory area rarely degrades performance and improves performance for large matrices, by up to 5 times. We also 0 the performance effect of adding custom floating-point using a simple area model to preserve total chip area. Sacrificing logic for memory and custom floating-point units increases single FPGA performance to 5 double precision Gflops.
" }, { "name": "Angelova, Anelia Nedelcheva", "degree": "Masters", "year": "2004", "title": "Data Pruning", "advisor": "Perona, Pietro", "url": "https://resolver.caltech.edu/CaltechETD:etd-05282004-000943", "creators": [ { "name": { "family": "Angelova", "given": "Anelia Nedelcheva" }, "id": "Angelova-Anelia-Nedelcheva", "orcid": "0000-0003-1822-7943", "display_name": "Angelova, Anelia Nedelcheva" } ], "advisors": [ { "name": { "family": "Perona", "given": "Pietro" }, "id": "Perona-P", "role": "advisor", "display_name": "Perona, Pietro" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/T1GM-1R20", "abstract": "Could a training example be detrimental to learning? Contrary to the common belief that more training data is needed for better generalization, we show that the learning algorithm might be better off when some training examples are discarded. In other words, the quality of the examples matters.
\r\n\r\nWe explore a general approach to identify examples that are troublesome for learning with a given model and exclude them from the training set in order to achieve better generalization. We term this process 'data pruning'. The method is targeted as a pre-learning step in order to obtain better data to train on.
\r\n\r\nThe approach consists in creating multiple semi-independent learners from the dataset each of which is influenced differently by individual examples. The multiple learners' opinions about which example is difficult are arbitrated by an inference mechanism. Although, without guarantees of optimality, data pruning is shown to decrease the generalization error in experiments on real-life data. It is not assumed that the data or the noise can be modeled or that additional training examples are available.
\r\n\r\nData pruning is applied for obtaining visual category data with little supervision. In this setting the object data is contaminated with non-object examples. We show that a mechanism for pruning noisy datasets prior to learning can be very successful especially in the presence of large amount of contamination or when the algorithm is sensitive to noise.
\r\n\r\nOur experiments demonstrate that data pruning can be worth while even if the algorithm has regularization capabilities or mechanisms to cope with noise and has a potential to be a more refined method for regularization or model selection.
" }, { "name": "Fanti, Claudio", "degree": "Masters", "year": "2004", "title": "An Improved Scheme for Detection and Labeling in Johansson Displays", "advisor": "Perona, Pietro", "url": "https://resolver.caltech.edu/CaltechETD:etd-05282004-144523", "creators": [ { "name": { "family": "Fanti", "given": "Claudio" }, "id": "Fanti-Claudio", "display_name": "Fanti, Claudio" } ], "advisors": [ { "name": { "family": "Perona", "given": "Pietro" }, "id": "Perona-P", "role": "advisor", "display_name": "Perona, Pietro" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/JF8Y-TK36", "abstract": "Consider a number of moving points, where each point is attached to a joint of the human body and projected onto an image plane. Johannson showed that humans can effortlessly detect and recognize the presence of other humans from such displays. This is true even when some of the body points are missing (e.g. because of occlusion) and unrelated clutter points are added to the display. We are interested in replicating this ability in a machine. To this end, we present a labeling and detection scheme in a probabilistic framework. Our method is based on representing the joint probability density of positions and velocities of body points with a graphical model, and using Loopy Belief Propagation to calculate a likely interpretation of the scene. Furthermore, we introduce a global variable representing the body's centroid. Experiments on one motion-captured sequence suggest that our scheme improves on the accuracy of a previous approach based on triangulated graphical models, especially when very few parts are visble. The improvement is due both to the more general graph structure we use and, more significantly, to the introduction of the centroid variable.\r\n" }, { "name": "Gao, Xiaojie", "degree": "Masters", "year": "2004", "title": "Router Congestion Control", "advisor": "Schulman, Leonard J.", "url": "https://resolver.caltech.edu/CaltechETD:etd-06142004-161237", "creators": [ { "name": { "family": "Gao", "given": "Xiaojie" }, "id": "Gao-Xiaojie", "display_name": "Gao, Xiaojie" } ], "advisors": [ { "name": { "family": "Schulman", "given": "Leonard J." }, "id": "Schulman-L-J", "role": "advisor", "display_name": "Schulman, Leonard J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/VZ4D-4047", "abstract": "Congestion is a natural phenomenon in any network queuing system, and is unavoidable if the queuing system is operated at capacity. In this thesis, we study how to set the rules of a queuing system so that all the users have a self interest in controlling congestion when it happens.
\r\n\r\nQueueing system is a crucial component in effective router congestion control since it determines the way packets from different sources interact with each other. If packets are dropped by the queueing system indiscriminately, in some cases, the effect can be to encourage senders to actually increase their transmission rates, worsening the congestion, and destabilizing the system.
\r\n\r\nWe approach this problem from game theory. We look on each flow as a competing player in the game; each player is trying to get as much bandwidth as possible. Our task is to design a game at the router that will protect low-volume flows and punish high-volume ones. Because of the punishment, being high-volume will be counter productive, so flows will tend to use a responsive protocol as their transport-layer protocol. The key aspect of our solution is that by sending no packets from high-volume flows in case of congestion, it gives these flows an incentive to use a more responsive protocol.
\r\n\r\nIn the thesis, we will describe several implementations of our solution, and show that we achieve the desired game-theoretic equilibrium while also maintaining bounded queue lengths and responding to changes in network flow conditions. Finally, we accompany the theoretical analysis with network simulations under a variety of conditions.
\r\n" }, { "name": "Pratap, Amrit", "degree": "Masters", "year": "2004", "title": "Maximum Drawdown of a Brownian Motion and AlphaBoost: a Boosting Algorithm", "advisor": "Abu-Mostafa, Yaser S.", "url": "https://resolver.caltech.edu/CaltechETD:etd-05272004-115820", "creators": [ { "name": { "family": "Pratap", "given": "Amrit" }, "id": "Pratap-Amrit", "display_name": "Pratap, Amrit" } ], "advisors": [ { "name": { "family": "Abu-Mostafa", "given": "Yaser S." }, "id": "Abu-Mostafa-Y-S", "role": "advisor", "display_name": "Abu-Mostafa, Yaser S." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/J2H0-XV66", "abstract": "We study two problems, one in the field of computational finance and the other one in machine learning.
\r\n\r\nFirstly we study the Maximal drawdown statistics of the Brownian random walk. We give the infinite series representation of its distribution and consider its expected value. For the case when drift is zero, we give an exact expression of the expected value and for the other cases, we give an infinite series representation. For all the cases, we compute the limiting behavior of the expected value.
\r\n\r\nSecondly, we propose a new algorithm for boosting, AlphaBoost, which does better than AdaBoost in reducing the cost function. We study its generalization properties and compare it to AdaBoost. However, this algorithm does not always give better out-of-sample performance.
" }, { "name": "\u021a\u0103pu\u0219, Cristian", "degree": "Masters", "year": "2004", "title": "Kernel Level Distributed Inter-Process Communication System (KDIPC)\r ", "advisor": "Hickey, Jason J.", "url": "https://resolver.caltech.edu/CaltechETD:etd-08312004-184300", "creators": [ { "name": { "family": "\u021a\u0103pu\u0219", "given": "Cristian" }, "id": "\u021a\u0103pu\u0219-Cristian", "display_name": "\u021a\u0103pu\u0219, Cristian" } ], "advisors": [ { "name": { "family": "Hickey", "given": "Jason J." }, "id": "Hickey-J-J", "role": "advisor", "display_name": "Hickey, Jason J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/N0A5-WA49", "abstract": "This thesis presents a kernel level distributed inter-process communication library (KDIPC) with support for distributed shared memory and distributed semaphores. KDIPC uses the System V inter-process communication programming interface and enhances it to provide functionality in distributed environments. The library uses a sequential consistency model for shared memory that provides ease of programming and preserves the semantics of parallel programs. A key feature of KDIPC is the use of the semaphore interface to support distributed synchronization. The implementation is done at the Linux kernel level to reduce the overhead induced by the strict consistency model.
\r\n \r\nThe thesis also investigates several protocols for maintaining sequential consistency, and for providing location discovery of remote copies of shared memory segments and semaphores. A case-study illustrates the benefits of KDIPC as compared to other inter-process communication libraries, such as the ease of programming provided by the sequential consistency model. Various details related to the implementation, the challenges encountered, and the benefits and disadvantages of using the different protocols are also presented.
\r\n\r\nFuture avenues of research include the use of speculative execution to improve the performance of the protocol used to maintain sequential consistency, the development of a distributed file system on top of the shared memory system, and the implementation of applications from applied sciences that would benefit from using the simple synchronization and sharing mechanisms of KDIPC.
\r\n" }, { "name": "Smith, Justin David", "degree": "Masters", "year": "2003", "title": "Fault Tolerance Using Whole-Process Migration and Speculative Execution", "advisor": "Hickey, Jason J.", "url": "https://resolver.caltech.edu/CaltechETD:etd-05272003-120725", "creators": [ { "name": { "family": "Smith", "given": "Justin David" }, "id": "Smith-Justin-David", "display_name": "Smith, Justin David" } ], "advisors": [ { "name": { "family": "Hickey", "given": "Jason J." }, "id": "Hickey-J-J", "role": "advisor", "display_name": "Hickey, Jason J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/AYFV-AS63", "abstract": "This thesis examines programming language concepts that facilitate fault-tolerant distributed programming. New language primitives are introduced for whole-process migration, which allows an active process to be transferred from one machine to another, and speculative execution, which enables optimistic computing based on an unverified assumption. These primitives are developed in the context of the Mojave Compiler Collection, a multi-language multi-architecture compiler with ties to the MetaPRL theorem prover.
\r\n\r\nThe new primitives are first discussed from a theoretical perspective. The primitives are implemented as part of a functional intermediate language in the Mojave compiler, which has a formal operational semantics and complete typing rules. The operational semantics and typing rules are extended to accommodate whole-process migration and speculative execution, and the implications these primitives have for program safety are discussed.
\r\n\r\nThe primitives are implemented as part of the Mojave compiler. The runtime safety checks that are required to ensure these primitives are safe are presented, along with runtime invariants used to justify the safety of the system. The primitives are also integrated with a novel compacting, generational garbage collector whose algorithm is presented.
" }, { "name": "Papadantonakis, Karl Spyros", "degree": "Masters", "year": "2002", "title": "What is \"Deterministic CHP\", and is \"Slack Elasticity\" That Useful?", "advisor": "Martin, Alain J.", "url": "https://resolver.caltech.edu/CaltechETD:etd-08222002-122806", "creators": [ { "name": { "family": "Papadantonakis", "given": "Karl Spyros" }, "id": "Papadantonakis-Karl-Spyros", "display_name": "Papadantonakis, Karl Spyros" } ], "advisors": [ { "name": { "family": "Martin", "given": "Alain J." }, "id": "Martin-A-J", "role": "advisor", "display_name": "Martin, Alain J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/PCCK-CS43", "abstract": "This paper addresses the issue of slack elasticity in distributed computation, as defined by the Caltech Asynchronous VLSI group. We show with a counterexample that slack elasticity is not sufficient for process decomposition. We give criteria which imply slack elasticity and which are sufficient for several forms of process decomposition, and present a hierarchy of determinism." }, { "name": "Ramamoorthi, Ravi", "degree": "Masters", "year": "1998", "title": "Creating Generative Models from Range Images", "advisor": "Arvo, James R.", "url": "https://resolver.caltech.edu/CaltechTHESIS:10162018-111851476", "creators": [ { "name": { "family": "Ramamoorthi", "given": "Ravi" }, "id": "Ramamoorthi-Ravi", "display_name": "Ramamoorthi, Ravi" } ], "advisors": [ { "name": { "family": "Arvo", "given": "James R." }, "id": "Arvo-J-R", "role": "advisor", "display_name": "Arvo, James R." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci", "physics" ], "doi": "10.7907/VZXG-Q639", "abstract": "We describe a new approach for creating concise high-level generative models from one or more approximate range images. Using simple acquisition techniques and a user-defined class of models, our method produces a simple and intuitive object description that is relatively insensitive to noise and is easy to manipulate and edit. The algorithm has two inter-related phases\u2014recognition, which chooses an appropriate model within a given hierarchy, and parameter estimation, which adjusts the model to fit the data. We give a simple method for automatically making tradeoffs between simplicity and accuracy to determine the best model. We also describe general techniques to optimize a specific generative model. In particular, we address the problem of creating a suitable objective function that is sufficiently continuous for use with finite-difference based optimization techniques. Our technique for model recovery and subsequent manipulation and editing is demonstrated on real objects\u2014a spoon, bowl, ladle, and cup\u2014using a simple tree of possible generative models.
\r\n\r\nWe believe that higher-level model representations are extremely important, and their recovery for actual objects is a fertile area of research towards which this thesis is a step. However, our work is preliminary and there are currently several limitations. The user is required to create a model hierarchy (and supply methods to provide an initial guess for model parameters within this hierarchy); the use of a large pre-defined class of models can help alleviate this problem. Further, we have demonstrated our technique on only a simple tree of generative models. While our approach is fairly general, a real system would require a tree that is significantly larger. Our methods work only where the entire object can be accurately represented as a single generative model; future work could use constructive solid geometry operations on simple generative models to represent more complicated shapes. We believe that many of the above limitations can be addressed in future work, allowing us to easily acquire and process three-dimensional shape in a simple, intuitive and efficient manner.
" }, { "name": "Kryukova, Svetlana A.", "degree": "Masters", "year": "1995", "title": "Parallel Programming Archetypes in Combinatorics and Optimization", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechTHESIS:04112012-083734292", "creators": [ { "name": { "family": "Kryukova", "given": "Svetlana A." }, "id": "Kryukova-S-A", "display_name": "Kryukova, Svetlana A." } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/g8mm-x344", "abstract": "A Parallel Programming Archetype is a language-independent program design strategy. We describe two archetypes in combinatorics and optimization, their components, implementations, and example applications developed using an archetype." }, { "name": "Watts, Jerrell", "degree": "Masters", "year": "1995", "title": "A Practical Approach to Dynamic Load Balancing", "advisor": "Taylor, Stephen", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-160604635", "creators": [ { "name": { "family": "Watts", "given": "Jerrell" }, "id": "Watts-J", "display_name": "Watts, Jerrell" } ], "advisors": [ { "name": { "family": "Taylor", "given": "Stephen" }, "id": "Taylor-S", "role": "advisor", "display_name": "Taylor, Stephen" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/jyz7-7019", "abstract": "No abstract." }, { "name": "Carlin, Peter", "degree": "Masters", "year": "1994", "title": "Distributed linear algebra on networks of workstations", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechTHESIS:03272012-094222255", "creators": [ { "name": { "family": "Carlin", "given": "Peter" }, "id": "Carlin-P", "display_name": "Carlin, Peter" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/ync0-mn20", "abstract": "This thesis describes the development of a portion of a distributed linear algebra library for use\r\non networks of workstations. The library was designed with special consideration towards three \r\ncharacteristics of networks of workstations: small numbers of processes, availability of multithreading, and high communication latency. Two aspects of the library are highlighted. First, modifications to message passing primitives to permit their use in a multithreaded environment. Second, modifications to basic linear algebra algorithms to improve their performance on networks of workstations. A model of distributed linear algebra on networks of workstations is developed, and used to predict the performance of the modified algorithms. These predictions are compared to experimental results on several networks of workstations." }, { "name": "Goldsmith, Jeff", "degree": "Masters", "year": "1994", "title": "Optimized Computer-Generated Motions for Animation", "advisor": "Barr, Alan H.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04092012-143011011", "creators": [ { "name": { "family": "Goldsmith", "given": "Jeff" }, "id": "Goldsmith-J", "display_name": "Goldsmith, Jeff" } ], "advisors": [ { "name": { "family": "Barr", "given": "Alan H." }, "id": "Barr-A-H", "role": "advisor", "display_name": "Barr, Alan H." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/s6r9-sr28", "abstract": "Computer programmers working on computer animation have long been trying to solve the problem of how to move objects in user-desired ways with a minimum of user interaction. Objects moving from one place to another move along a path often determined by a spline. We would like to be able to allow the user a specify a characteristic of the object's motion and the animation system to choose a motion path that evidences that characteristic. We develop an approach using constrained optimization that will create paths. Some interesting motions have been found. We describe the effects obtainable from this method so that an animator can sensibly choose between them. We found that minimization of the covariant acceleration of all the points in a body leads to motion that is attractive. This motion seems to cause the moving body to anticipate its motion path in order to prevent sudden moves. It also seems to create very fluid-appearing motions because it tries to avoid sharp turns and sudden stops." }, { "name": "Manohar, Rajit", "degree": "Masters", "year": "1994", "title": "Mach-Based Channel Library", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-094328813", "creators": [ { "name": { "family": "Manohar", "given": "Rajit" }, "id": "Manohar-R", "display_name": "Manohar, Rajit" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/q2v9-sq59", "abstract": "No abstract." }, { "name": "Maskit, Daniel", "degree": "Masters", "year": "1994", "title": "A Message-Driven Programming System for Fine-Grain Multicomputers", "advisor": "Taylor, Stephen", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-095225392", "creators": [ { "name": { "family": "Maskit", "given": "Daniel" }, "id": "Maskit-D", "display_name": "Maskit, Daniel" } ], "advisors": [ { "name": { "family": "Taylor", "given": "Stephen" }, "id": "Taylor-S", "role": "advisor", "display_name": "Taylor, Stephen" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/z35v-1x17", "abstract": "No abstract." }, { "name": "\u00c7ataltepe, Zehra K\u00f6k", "degree": "Masters", "year": "1994", "title": "The Scheduling Problem in Learning from Hints", "advisor": "Abu-Mostafa, Yaser S.", "url": "https://resolver.caltech.edu/CaltechTHESIS:03272012-100501462", "creators": [ { "name": { "family": "\u00c7ataltepe", "given": "Zehra K\u00f6k" }, "id": "\u00c7ataltepe-Zehra-K\u00f6k", "orcid": "0000-0002-9742-5907", "display_name": "\u00c7ataltepe, Zehra K\u00f6k" } ], "advisors": [ { "name": { "family": "Abu-Mostafa", "given": "Yaser S." }, "id": "Abu-Mostafa-Y-S", "role": "advisor", "display_name": "Abu-Mostafa, Yaser S." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/3zvq-w228", "abstract": "Any information about the function to be learned is called a hint. Learning from hints is a generalization of learning from examples. In this paradigm, hints are expressed by their examples and then taught to a learning-from-examples system. In general, using other hints in addition to the examples of the function, improves the generalization performance.
\r\n\r\nThe scheduling problem in learning from hints is deciding which hint to teach at which time during training. Over- or under- emphasizing a hint may render it useless, making scheduling very important. Fixed and adaptive schedules are two types of schedules that are discussed.
\r\n\r\nAdaptive minimization is a general adaptive schedule that uses an estimate of generalization error in terms of errors on hints. when such an estimate is available, it can also be optimized by means of directly descending on it. An estimate may be used to decide on when to stop training, too.
\r\n\r\nA method to find a estimate incorporating the errors on invariance hints, and simulation results on this estimate, are presented. Two computer programs that provide a learning-from-hints environment and improvements on them are discussed.
" }, { "name": "Cook, James N.", "degree": "Masters", "year": "1993", "title": "Production Rule Verification for Quasi-Delay-Insensitive Circuits", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04022012-152118181", "creators": [ { "name": { "family": "Cook", "given": "James N." }, "id": "Cook-J-N", "display_name": "Cook, James N." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/t65k-bq93", "abstract": "No abstract." }, { "name": "Massingill, Berna Linda", "degree": "Masters", "year": "1993", "title": "Integrating Task and Data Parallelism", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-130550435", "creators": [ { "name": { "family": "Massingill", "given": "Berna Linda" }, "id": "Massingill-B-L", "display_name": "Massingill, Berna Linda" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "role": "advisor", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/a7ga-s950", "abstract": "Many models of concurrency and concurrent programming have been proposed; most can\r\nbe categorized as either task-parallel (based on functional decomposition) or data-parallel\r\n(based on data decomposition). Task-parallel models are most effective for expressing irregular\r\ncomputations; data-parallel models are most effective for expressing regular computations.\r\nSome computations, however, exhibit both regular and irregular aspects. For\r\nsuch computations, a better programming model is one that integrates task and data parallelism.\r\nThis report describes one model of integrating task and data parallelism, some\r\nproblem classes for which it is effective, and a prototype implementation." }, { "name": "Sivilotti, Paul", "degree": "Masters", "year": "1993", "title": "A Verified Integration of Imperative Parallel Programming Paradigms in an Object-Oriented Language", "advisor": "Chandy, K. Mani", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-114004175", "creators": [ { "name": { "family": "Sivilotti", "given": "Paul" }, "id": "Sivilotti-P", "display_name": "Sivilotti, Paul" } ], "advisors": [ { "name": { "family": "Chandy", "given": "K. Mani" }, "id": "Chandy-K-M", "display_name": "Chandy, K. Mani" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/ngrt-q826", "abstract": "CC++ is a parallel object-oriented programming language that uses parallel composition, atomic functions, and single-assignment variables to express concurrency. We show that this programming paradigm is equivalent to several traditional imperative communication and synchronization models, namely: semaphores, monitors, and asynchronous channels. A collection of libraries which integrates these traditional models with CC++ is specified, implemented, and formally verified." }, { "name": "Laidlaw, David H.", "degree": "Masters", "year": "1992", "title": "Material Classification of Magnetic Resonance Volume Data", "advisor": "Barr, Alan H.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04112012-084513712", "creators": [ { "name": { "family": "Laidlaw", "given": "David H." }, "id": "Laidlaw-D-H", "display_name": "Laidlaw, David H." } ], "advisors": [ { "name": { "family": "Barr", "given": "Alan H." }, "id": "Barr-A-H", "role": "advisor", "display_name": "Barr, Alan H." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/x6rr-4t20", "abstract": "A major unsolved problem in computer graphics is that of making high-quality models. Traditionally, models have consisted of interactively or algorithmically described collections of graphics primitives such as polygons.The process of constructing these models is painstaking and often misses features and behavior that we wish to model. Models extracted from volume data collected from real, physical objects have the potential to show features and behavior that are difficult to capture using these traditional modeling methods.
\r\n\r\nWe use vector-valued magnetic resonance volume data in this thesis. The process of extracting models from such data involves four main steps: collecting the sampled volume data; preprocessing it to reduce artifacts from the collection process; classifying materials within the data; and creating either a rigid geometric model that is static, or a flexible, dynamic model that can be simulated. In this thesis we focus on the the first three steps.
\r\n\r\nWe present guidelines and techniques for collecting and processing magnetic resonance data to meet the needs of the later steps. Our material classification and model extraction techniques work better when the data values for a given material are constant throughout the dataset, when data values for different materials are different, and when the dataset is free of aliasing artifacts and noise.
\r\n\r\nWe present a new material-classification method that operates on vector-valued volume data. The method produces a continuous probability function for each material over the volume of the dataset, and requires no expert interaction to teach it different material classes. It operates by fitting peaks in the histogram of a collected dataset using parameterized gaussian bumps, and by using Bayes' law to calculate material probabilities, with each gaussian bump representing one material.
\r\n\r\nTo illustrate the classification method, we apply it to real magnetic resonance data of a human head, a human hand, a banana, and a jade plant. From the classified data, we produce \"computationally stained\" slices that discriminate among materials better than do the original grey-scale versions. We also generate volume-rendered images of classified datasets clearly showing different anatomical features of various materials. Finally, we extract preliminary static and dynamic geometric models of different tissues.
" }, { "name": "Boden, Nanette Jackson", "degree": "Masters", "year": "1988", "title": "A study of fine-grain programming using Cantor", "advisor": "Seitz, Charles L.", "url": "https://resolver.caltech.edu/CaltechTHESIS:03262012-111947334", "creators": [ { "name": { "family": "Boden", "given": "Nanette Jackson" }, "id": "Boden-Nanette-Jackson", "display_name": "Boden, Nanette Jackson" } ], "advisors": [ { "name": { "family": "Seitz", "given": "Charles L." }, "id": "Seitz-C-L", "role": "advisor", "display_name": "Seitz, Charles L." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/z2fe-5a26", "abstract": "No abstract." }, { "name": "Burch, Jerry R.", "degree": "Masters", "year": "1988", "title": "A Comparison of Strict and Non-Strict Semantics for Lists", "advisor": "Martin, Alain J.", "url": "https://resolver.caltech.edu/CaltechTHESIS:03262012-113851465", "creators": [ { "name": { "family": "Burch", "given": "Jerry R." }, "id": "Burch-Jerry-R", "display_name": "Burch, Jerry R." } ], "advisors": [ { "name": { "family": "Martin", "given": "Alain J." }, "id": "Martin-A-J", "role": "advisor", "display_name": "Martin, Alain J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/01bb-3j05", "abstract": "[Introduction] Implementations of functional programming languages can be classified according to whether they apply eager-evaluation or lazy-evaluation. Eager-evaluation gives rise to strict semantics while lazy-evaluation gives rise to non-strict semantics. In this paper we define the syntax of a simple functional programming language, and specify strict and non-strict denotational semantics for that language. These semantics are specified by giving axioms for the domains and semantic functions involved. The axioms for the two different semantics are very similar, differing only in the specification of cons. However, this small difference results in the domains for the two semantics being quite different. Giving axioms, rather than just postulating particular domains and semantic functions, makes more explicit the similarities of the strict and the non-strict semantics. We give a model of the axioms of the nonstrict semantics in order to show their consistency, and show that any two such models are isomorphic." }, { "name": "Seizovic, Jakov N.", "degree": "Masters", "year": "1988", "title": "The Reactive Kernel", "advisor": "Seitz, Charles L.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-161857776", "creators": [ { "name": { "family": "Seizovic", "given": "Jakov N." }, "id": "Seizovic-Jakov-N", "display_name": "Seizovic, Jakov N." } ], "advisors": [ { "name": { "family": "Seitz", "given": "Charles L." }, "id": "Seitz-C-L", "role": "advisor", "display_name": "Seitz, Charles L." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/r8k6-tq12", "abstract": "No abstract." }, { "name": "Burns, Steven Morgan", "degree": "Masters", "year": "1987", "title": "Automated compilation of concurrent programs into self-timed circuits", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:03272012-085559361", "creators": [ { "name": { "family": "Burns", "given": "Steven Morgan" }, "id": "Burns-Steven-Morgan", "display_name": "Burns, Steven Morgan" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/j438-dz84", "abstract": "No abstract." }, { "name": "Poh, Hean Lee", "degree": "Masters", "year": "1987", "title": "Incorporating Time in the New World of Computing Systems", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-105252507", "creators": [ { "name": { "family": "Poh", "given": "Hean Lee" }, "id": "Poh-Hean-Lee", "display_name": "Poh, Hean Lee" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/85gd-y881", "abstract": "The New World of Computing System, referred to as the New World system, is a\r\ntotal system for the structuring, manipulation and communication of information. Time\r\nis a ubiquitous aspect of most databases. The aim of this thesis is to study the problems\r\nassociated with the implementation of time in the New World system. Time information\r\nis not only stored in New World, they can be retrieved and processed to answer various\r\ntypes of user queries. This is an additional feature as compared to most models of time\r\nimplementation in databases where the relationships between time intervals are not dealt\r\nwith. To start with, ways of representing time in the form of floating point number are\r\ndevised and discussed. Then the conversion of time information from its various user\r\naccustomed forms to New World system internal form and back are explored. Finally,\r\nthe ambiguities and complexities involved in finding the intersection, subtraction, union\r\nand extension of two different sequences of time intervals associated with an object in a\r\ndatabase are studied and algorithms for resolving these are presented. An explanation on\r\nhow the crunchers work with the addition of time information is also given. This includes\r\ndiscussing about how quantifiers such as at least 2, how many etc. are handled in the New\r\nWorld system. Case studies are also conducted to test out these routines. As conclusion,\r\nthe remaining problems associated with time implementation not covered in this thesis\r\nwork are discussed." }, { "name": "Lazzaro, John Paul", "degree": "Masters", "year": "1986", "title": "anaLOG: A Functional Simulator for VLSI Neural Systems", "advisor": "Mead, Carver", "url": "https://resolver.caltech.edu/CaltechTHESIS:04112012-092513753", "creators": [ { "name": { "family": "Lazzaro", "given": "John Paul" }, "id": "Lazzaro-John-Paul", "display_name": "Lazzaro, John Paul" } ], "advisors": [ { "name": { "family": "Mead", "given": "Carver" }, "id": "Mead-C-A", "orcid": "0000-0003-4051-0462", "role": "advisor", "display_name": "Mead, Carver" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/af3r-e056", "abstract": "No abstract." }, { "name": "Schweizer, David Lawrence", "degree": "Masters", "year": "1986", "title": "Some Results on Kolmogorov-Chaitin Complexity", "advisor": "Abu-Mostafa, Yaser S.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04132012-090947715", "creators": [ { "name": { "family": "Schweizer", "given": "David Lawrence" }, "id": "Schweizer-David-Lawrence", "display_name": "Schweizer, David Lawrence" } ], "advisors": [ { "name": { "family": "Abu-Mostafa", "given": "Yaser S." }, "id": "Abu-Mostafa-Y-S", "role": "advisor", "display_name": "Abu-Mostafa, Yaser S." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/50qm-c858", "abstract": "No abstract." }, { "name": "Platt, John Carlton", "degree": "Masters", "year": "1985", "title": "Sequential Threshold Circuits", "advisor": "Mead, Carver; Hopfield, John J.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-104617758", "creators": [ { "name": { "family": "Platt", "given": "John Carlton" }, "id": "Platt-John-Carlton", "orcid": "0000-0002-5652-5303", "display_name": "Platt, John Carlton" } ], "advisors": [ { "name": { "family": "Mead", "given": "Carver" }, "id": "Mead-C-A", "orcid": "0000-0003-4051-0462", "role": "advisor", "display_name": "Mead, Carver" }, { "name": { "family": "Hopfield", "given": "John J." }, "id": "Hopfield-J-J", "role": "advisor", "display_name": "Hopfield, John J." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/fsx9-vh16", "abstract": "No abstract." }, { "name": "Steele, Craig Stanley", "degree": "Masters", "year": "1985", "title": "Placement of Communicating Processes on Multiprocessor Networks", "advisor": "Seitz, Charles L.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-143033166", "creators": [ { "name": { "family": "Steele", "given": "Craig Stanley" }, "id": "Steele-Craig-Stanley", "display_name": "Steele, Craig Stanley" } ], "advisors": [ { "name": { "family": "Seitz", "given": "Charles L." }, "id": "Seitz-C-L", "role": "advisor", "display_name": "Seitz, Charles L." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/kemx-dv57", "abstract": "No abstract." }, { "name": "Chen, Wen-Chi", "degree": "Masters", "year": "1984", "title": "Hierarchy of Graph Isomorphism Testing", "advisor": "Bryant, Randal E.", "url": "https://resolver.caltech.edu/CaltechTHESIS:03272012-160759964", "creators": [ { "name": { "family": "Chen", "given": "Wen-Chi" }, "id": "Chen-W-C", "display_name": "Chen, Wen-Chi" } ], "advisors": [ { "name": { "family": "Bryant", "given": "Randal E." }, "id": "Bryant-R", "orcid": "0000-0001-5024-6613", "role": "advisor", "display_name": "Bryant, Randal E." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/pgav-zy26", "abstract": "No abstract." }, { "name": "Chiang, Chao-Lin", "degree": "Masters", "year": "1984", "title": "Towards Concurrent Arithmetic: Residue Arithmetic and VLSI", "advisor": "Johnsson, Lennart", "url": "https://resolver.caltech.edu/CaltechTHESIS:04022012-150108167", "creators": [ { "name": { "family": "Chiang", "given": "Chao-Lin" }, "id": "Chiang-Chao-Lin", "display_name": "Chiang, Chao-Lin" } ], "advisors": [ { "name": { "family": "Johnsson", "given": "Lennart" }, "id": "Johnsson-L", "orcid": "0000-0003-0337-879X", "role": "advisor", "display_name": "Johnsson, Lennart" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/mh9h-1v86", "abstract": "No abstract." }, { "name": "Derby, Howard", "degree": "Masters", "year": "1984", "title": "Using Logic Programming for Compiling APL", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04092012-134858703", "creators": [ { "name": { "family": "Derby", "given": "Howard" }, "id": "Derby-Howard", "display_name": "Derby, Howard" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/gmjh-z702", "abstract": "APL is a dynamically typed language which deals with arrays whose type,\r\nnumber of dimensions (rank) and size are not fixed at compile time, but are instead\r\ndetermined at run time. This makes APL more difficult to compile than static languages\r\nlike Pascal or FORTRAN. This thesis describes a prototype implementation\r\nof the core of an APL compiler. The intention thus far has been to demonstrate\r\ntechniques for dealing with some of the issues that arise when trying to implement\r\nAPL efficiently, rather than to produce a working implementation. The present\r\nprogram does not do any of the initial lexical processing required, and only compiles\r\ninto intermediate code. Object code is never produced. The prototype has\r\nmany APL features missing and is undoubtedly full of bugs." }, { "name": "Lutz, Christopher", "degree": "Masters", "year": "1984", "title": "Design of the Mosaic Processor", "advisor": "Seitz, Charles L.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-093644670", "creators": [ { "name": { "family": "Lutz", "given": "Christopher" }, "id": "Lutz-Christopher", "orcid": "0000-0002-7993-4759", "display_name": "Lutz, Christopher" } ], "advisors": [ { "name": { "family": "Seitz", "given": "Charles L." }, "id": "Seitz-C-L", "role": "advisor", "display_name": "Seitz, Charles L." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/cs85-zs74", "abstract": "No abstract." }, { "name": "Ngai, John Yee-Keung", "degree": "Masters", "year": "1984", "title": "The General Interconnect Problem of Integrated Circuits", "advisor": "Seitz, Charles L.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04132012-084100294", "creators": [ { "name": { "family": "Ngai", "given": "John Yee-Keung" }, "id": "Ngai-John-Yee-Keung", "display_name": "Ngai, John Yee-Keung" } ], "advisors": [ { "name": { "family": "Seitz", "given": "Charles L." }, "id": "Seitz-C-L", "role": "advisor", "display_name": "Seitz, Charles L." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/fgcc-ks03", "abstract": "This thesis is concerned with the interconnection problem of custom integrated circuits. It may be broadly defined as the transformation of circuit description represented by the notion of modules together with the circuit connectivity requirements, into wiring patterns which implement the required connectivities. Conventional approaches to its solution are presented. Issues such as partition to placement and routing and various layout optimization tradeoffs are discussed. A detail hierarchical routing model with timing considerations that extends naturally to multiple conducting layer environment is presented. Several of the implications of this extension are also discussed.
\r\n\r\nThe rest of this thesis deals with an experiment with the stepping approach to routing as an alternative to the conventional cellular approach emphasizing simplicity rather than optimization. Algorithms for routing signals and power developed for the stepping router are presented. An implementation of this approach by the author together with some test examples and their results are also described. This thesis concludes with a few suggestions for further research work in this area which the author considers very important from the experience gained during the work on this thesis.
" }, { "name": "Oyang, Yen-Jen", "degree": "Masters", "year": "1984", "title": "HEX: A Hierarchical Circuit Extractor", "advisor": "Bryant, Randal E.", "url": "https://resolver.caltech.edu/CaltechTHESIS:05022012-105611552", "creators": [ { "name": { "family": "Oyang", "given": "Yen-Jen" }, "id": "Oyang-Y-J", "orcid": "0009-0001-6241-9881", "display_name": "Oyang, Yen-Jen" } ], "advisors": [ { "name": { "family": "Bryant", "given": "Randal E." }, "id": "Bryant-R", "orcid": "0000-0001-5024-6613", "role": "advisor", "display_name": "Bryant, Randal E." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/mptd-b683", "abstract": "This report describes the algorithm, implementation, and performance of a hierarchical circuit extractor, HEX, for Metal-Oxide Semiconductor (MOS) layout designs at Caltech. The input to HEX is a layout design in Caltech\r\nIntermediate Form (CIF), a hierarchical layout description language, and the output is a hierarchical netlist describing the circuit. HEX avoids redundant\r\nwork by finding out the repetitive cells in the input CIF file. To handle overlapping instances, HEX modifies the hierarchy in the CIF file to generate a new one without overlapping instances. HEX then traverses the resulting\r\nhierarchical structure, calls a flat extractor to extract leaf cells and composes cells bottom up to get the circuit information of the whole chip." }, { "name": "Su, Wen-King", "degree": "Masters", "year": "1984", "title": "Supermesh", "advisor": "Seitz, Charles L.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-161148552", "creators": [ { "name": { "family": "Su", "given": "Wen-King" }, "id": "Su-Wen-King", "display_name": "Su, Wen-King" } ], "advisors": [ { "name": { "family": "Seitz", "given": "Charles L." }, "id": "Seitz-C-L", "role": "advisor", "display_name": "Seitz, Charles L." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/yvj1-jt57", "abstract": "No abstract." }, { "name": "Athas, William C.", "degree": "Masters", "year": "1983", "title": "A VLSI Combinator Reduction Engine", "advisor": "Seitz, Charles L.", "url": "https://resolver.caltech.edu/CaltechTHESIS:03262012-092805759", "creators": [ { "name": { "family": "Athas", "given": "William C." }, "id": "Athas-William-C", "display_name": "Athas, William C." } ], "advisors": [ { "name": { "family": "Seitz", "given": "Charles L." }, "id": "Seitz-C-L", "role": "advisor", "display_name": "Seitz, Charles L." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/r471-je71", "abstract": "No abstract." }, { "name": "Choo, Young-il", "degree": "Masters", "year": "1983", "title": "Hierarchical Nets: A Structured Petri Net Approach to Concurrency", "advisor": "Kajiya, James Thomas", "url": "https://resolver.caltech.edu/CaltechTHESIS:04022012-150759898", "creators": [ { "name": { "family": "Choo", "given": "Young-il" }, "id": "Choo-Young-il", "display_name": "Choo, Young-il" } ], "advisors": [ { "name": { "family": "Kajiya", "given": "James Thomas" }, "id": "Kajiya-J-T", "role": "advisor", "display_name": "Kajiya, James Thomas" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/t5w4-vt07", "abstract": "Liveness and safeness are two key properties Petri nets should have when they are used to model asynchronous systems. The analysis of liveness and safeness for general Petri nets, though shown to be decidable by Mayr [1981], is still computationally expensive (Lipton [1976]). In this paper an hierarchical approach is taken: a class of Petri nets is recursively defined starting with simple, live and safe structures, becoming progressively more complex using net transformations designed to preserve liveness and safeness.
\r\n\r\nUsing simple net transformations, nice nets, which are live and safe, are defined. Their behavior is too restrictive for modeling non-trivial systems, so the mutual exclusion and the repetition constructs are added to get \u00b5-\u03c1-nets. Since the use of mutual exclusions can cause deadlock, and the use of repetitions can cause loss of safeness, restrictions for their use are given. Using \u00b5-\u03c1-nets as the building blocks, hierarchical nets are defined. When the mutual exclusion and repetition constructs are allowed between hierarchical nets, distributed hierarchical nets are obtained. Examples of distributed hierarchical nets used to solve synchronization problems\r\nare given.
\r\n\r\nGeneral net transformations not preserving liveness or safeness, and a notion of duality are presented, and their effect on Petri net behavior is considered.
" }, { "name": "Holstege, Eric John", "degree": "Masters", "year": "1983", "title": "Type Inference in a Declarationless, Object-Oriented Language", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04112012-080413185", "creators": [ { "name": { "family": "Holstege", "given": "Eric John" }, "id": "Holstege-Eric-John", "display_name": "Holstege, Eric John" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/sa4t-bn94", "abstract": "In recent years, two developments in the design of programming languages have yielded significant improvements in a number of areas from the standard FBAPP programming model. These are the object-oriented paradigm, and variable polymorphism.
\r\n\r\nThe object-oriented programming model allows the specification, hence restriction of the operations allowed on a data structure, something not possible with the more traditional PASCAL-style record structuring. This\r\nability to encapsulate data from the outside world gives a greater security and error avoidance in very large software projects involving many programmers.
\r\n\r\nIn addition, the object-oriented style is conceptually easy to program in, providing a useful framework for the subdivision of large problems into manageable pieces. This property is essential for the rapid and reliable\r\nimplementation of large software systems.
\r\n\r\nVariable polymorphism refers to the ability of variables to change types at runtime. This is in contradistinction to typelessness (as in BLISS) where variables have no types associated with them. In most common languages,\r\nthe programmer must declare the types of all the variables he uses; these types are then static throughout the execution of the program. Declarations allow the compiler to produce efficient code and to identify errors whose\r\ndetection must other-wise be deferred until runtime; however, they sacrifices a good deal of the generality which is possible with less stringent variable\r\nbinding schemes. On the other hand, languages which don't require declarations, and which allow variables to change types, such as SNOBOL and LISP, provide this generality by virtue of their extremely late binding, but thereby sacrifice efficiency.
\r\n\r\nSMALLTALK is perhaps the purest language which embodies both object-orientedness and declarationlessness. Unfortunately, these two features, while of great benefit in increasing programmer productivity and program\r\nreliability, suffer heavily from the point of view of runtime efficiency.
\r\n\r\nThe project is to investigate ways to obtain the undeniable advantages of polymorphism and object-orientedness, without sacrificing runtime\r\nefficiency. More specifically, the goal is to build a compiler for a dialect of SMALLTALK for the VAX under UNIX (Berkeley 4.1bsd), which incorporates data-flow type inference algorithms enabling it to produce executable\r\nprograms of an efficiency comparable to that of programs produced by compilers for more traditional but less powerful languages.
\r\n\r\nThe optimization methods are described, test results are examined, and indications of future directions are given.
" }, { "name": "Lam, Jimmy Kwok-Ching", "degree": "Masters", "year": "1983", "title": "RTsim: A Register Transfer Simulator", "advisor": "Bryant, Randal E.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04112012-091046970", "creators": [ { "name": { "family": "Lam", "given": "Jimmy Kwok-Ching" }, "id": "Lam-Jimmy-Kwok-Ching", "display_name": "Lam, Jimmy Kwok-Ching" } ], "advisors": [ { "name": { "family": "Bryant", "given": "Randal E." }, "id": "Bryant-R", "role": "advisor", "display_name": "Bryant, Randal E." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/727m-mf30", "abstract": "The growing complexity and size of VLSI processors are demanding extremely accurate, simulation facilities for microcode debugging, logic verification, and system integration. However, reliance on mask iterations to remedy problems on a chip not only raises costs, but also extends the design cycle. Simulation justifies itself in both the turn around time and the design cost. Gate level simulation is one method for reducing errors in a chip design. However, gate level simulation of large designs are extremely expensive, and sometimes impossible when the gate level representation is not known. This thesis attempts to solve this problem by providing a functional modeling language, a reconfigurable assembler, and a functional simulation program. Mixed-level simulation capability is also provided by allowing the replacement of a functional unit by a transistor network which is being simulated by a switch-level logic simulator." }, { "name": "Ng, Charles Hok-Bun", "degree": "Masters", "year": "1983", "title": "FIFO Buffering Transceiver: A Communication Chip Set for Multiprocessor Systems", "advisor": "Seitz, Charles L.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04132012-082850723", "creators": [ { "name": { "family": "Ng", "given": "Charles Hok-Bun" }, "id": "Ng-Charles-Hok-Bun", "display_name": "Ng, Charles Hok-Bun" } ], "advisors": [ { "name": { "family": "Seitz", "given": "Charles L." }, "id": "Seitz-C-L", "role": "advisor", "display_name": "Seitz, Charles L." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/vdzd-7h35", "abstract": "This thesis describes a family of VLSI chips designed to link a number of processors on a one-to-one basis. With these chips as communication system building blocks, a complex multiprocessor system can be built. Inter-processor communication within the multiprocessor system is accomplished by passing messages composed of data packets.
\r\n\r\nThe resulting chip, called a First-in-first-out Buffering Transceiver (FIBT), provides a full duplex communication channel between any two processors. FIFO queues are provided for buffering data on each communication channel. FIBT accepts data packets from the host processor via a parallel data bus and serially sends them out to the destined processor. FIBT handshakes with the processor by using asynchronous interrupt signals.
\r\n\r\nLinkage between any two FIBTs is accomplished by using only two wires. Both data bits and handshaking signals are sent by these two lines. The FIBT system is neither a synchronous nor an asynchronous one; instead, it is an \"one-clock-different-phases\" system. A clock signal sets up the frequency reference; the start and stop bits set up the phase reference.
\r\n\r\nFinally, FIBT is implemented in nMOS technology. The design of the circuit is discussed in detail. The design is generalized enough so that data packets of various sizes can be handled. The layout of the chip is coded in an integrated circuit descriptive language. Any member of the family of chips can be obtained by changing three basic parameters. Techniques used in verifying the circuit are shown, and several observations about VLSI design are offered.
" }, { "name": "Kingsley, Christopher Hayden", "degree": "Masters", "year": "1982", "title": "EARL: An Integrated Circuit Design Language", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04112012-082810035", "creators": [ { "name": { "family": "Kingsley", "given": "Christopher Hayden" }, "id": "Kingsley-Christopher-Hayden", "display_name": "Kingsley, Christopher Hayden" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/z452-0r86", "abstract": "No abstract." }, { "name": "Whiting, Douglas Lee", "degree": "Masters", "year": "1982", "title": "A Self-Timed Chip Set for Microprocessor Communication", "advisor": "Seitz, Charles L.", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-110450092", "creators": [ { "name": { "family": "Whiting", "given": "Douglas Lee" }, "id": "Whiting-Douglas-Lee", "display_name": "Whiting, Douglas Lee" } ], "advisors": [ { "name": { "family": "Seitz", "given": "Charles L." }, "id": "Seitz-C-L", "role": "advisor", "display_name": "Seitz, Charles L." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/tnv1-t713", "abstract": "This paper describes a family of chips used to link multiple processors together on a speed-independent communication bus. Sendership arbitration is included as an integral part of the signalling scheme, incurring very little overhead and providing a measure of fairness. The protocol allows for one-to-many communication in which the sender must wait for all receivers to respond to each datum transmitted. The width of the data bus is arbitrary, and only three control wires are necessary for normal transmission cycles. In order to alleviate congestion, the global bus may be divided into several local buses by a method which is entirely transparent to the processor software. Thus the bus topology may be reconfigured for each processing network using these chips as building blocks.
\r\n\r\nFunctional verification of speed-independent circuits is also discussed. The problem is seen to be very complex, but some conclusions are drawn about the type of tools which will be helpful in implementing self-timed systems.
" }, { "name": "Gray, Moshe", "degree": "Masters", "year": "1981", "title": "The Design and Implementation of a Reticle Maker for VLSI", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:03122018-162127158", "creators": [ { "name": { "family": "Gray", "given": "Moshe" }, "id": "Gray-Moshe", "display_name": "Gray, Moshe" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/0v5p-7011", "abstract": "This paper describes the designing and building of a feedback controlled Reticle Maker for the VLSI industry. The machine is based on an innovative design of an XY photo plotter which utilizes flexures and linear motors as a means to raster scan a photographic plate. The accuracy of the machine is based on Laser Interferometery and feedback control. " }, { "name": "Lien, Sheue-Ling C.", "degree": "Masters", "year": "1981", "title": "Toward a Theorem Proving Architecture", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-090812718", "creators": [ { "name": { "family": "Lien", "given": "Sheue-Ling C." }, "id": "Lien-Sheue-Ling-C", "display_name": "Lien, Sheue-Ling C." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/ctky-sp95", "abstract": "No abstract." }, { "name": "Lin, Tzu-Mu", "degree": "Masters", "year": "1981", "title": "From Geometry to Logic", "advisor": "Mead, Carver", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-091736952", "creators": [ { "name": { "family": "Lin", "given": "Tzu-Mu" }, "id": "Lin-Tzu-Mu", "display_name": "Lin, Tzu-Mu" } ], "advisors": [ { "name": { "family": "Mead", "given": "Carver" }, "id": "Mead-C-A", "orcid": "0000-0003-4051-0462", "role": "advisor", "display_name": "Mead, Carver" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/887g-zn84", "abstract": "Transformation between five different intermediate forms used in VLSI design are discussed. The intermediate forms are: the D language, Akers' Diagrams, transistor listings, the sticks standard, and CIF language. They represent architecture, logic, transistor, topology and geometric levels, respectively. To understand more about the relationships between these levels, a series of transformations from the CIF to the sticks standard, from the sticks standard to the transistor listing, and from the transistor listing to the Akers' Diagram are presented. By doing this, the description gap between the logical world and the physical world is bridged.
\r\n\r\nCAD developers often complain about the lack of a model that can be applied uniformly throughout the entire design process. Akers' Diagrams seem to meet this demand. This work highlights this point.
\r\n\r\nAs an example, a shift register implemented in NMOS technology will appear many times in this thesis.
" }, { "name": "Mosteller, Richard Craig", "degree": "Masters", "year": "1981", "title": "REST: A Leaf Cell Design System", "advisor": "Kajiya, James Thomas", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-162654185", "creators": [ { "name": { "family": "Mosteller", "given": "Richard Craig" }, "id": "Mosteller-Richard-Craig", "display_name": "Mosteller, Richard Craig" } ], "advisors": [ { "name": { "family": "Kajiya", "given": "James Thomas" }, "id": "Kajiya-J-T", "role": "advisor", "display_name": "Kajiya, James Thomas" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/1r9d-ad60", "abstract": "This thesis describes a leaf cell design system, REST, Richard's Editor for Sticks. REST is intended to be used for the preparation of the lowest level cells in an integrated circuit design. A stick notation is used in the editing process. Given a structured design methodology any design task can be separated into two parts: 1) leaf cell design and 2) composition cell design. This tool addresses the first of these tasks, although it may also be used for general manipulation of stick diagrams. A table driven compaction algorithm is presented. This graph based algorithm uses a weighted affinity factor to reduce total polysilicon and diffusion wire length. A suite of utilities provide functions such as file interface, physical mapping, annotation, etc. consistent with a set of design rules. The system has been implemented in Simula on a DEC 20 computer, and works in conjunction with a limited functional diagramming system. The design rules, models and stick interpretation are table driven and can be changed for various technologies. Currently REST is being used for NMOS technology. A community of users have used the REST system to prepare a number of designs resulting in a substantial reduction of design time. In addition, the system is currently being used at a major computer manufacturer in conjunction with a VLSI design course." }, { "name": "S\u00e9gal, Richard Lawrence", "degree": "Masters", "year": "1981", "title": "Structure, Placement and Modelling", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04132012-091556662", "creators": [ { "name": { "family": "S\u00e9gal", "given": "Richard Lawrence" }, "id": "S\u00e9gal-Richard-Lawrence", "display_name": "S\u00e9gal, Richard Lawrence" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/tb24-mg70", "abstract": "The nature of hierarchical design tools for VLSI implementation is explored in\r\nterms of the \"Caltech Structured Design Philosophy\" as interpreted by Rowson in his\r\ndoctoral thesis [Rowson]. One obvious implication of this thesis is the desirability\r\nof tools for leaf and composition cell design. This thesis describes one such tool\r\ntargeted at the composition cell design problem. It is intended to be used in the\r\narchitectual phases of a design and allows structural (interface specification),\r\nphysical (floor planing), and behavioral (simulation modelling) descriptions to be\r\nwritten down, integrated, and tested. One biproduct of this process is the\r\ngeneration or a comprehensive design document from which workbooks can be\r\ngenerated automatically.
\r\n\r\nThe later sections describe a hierarchical simulator and how it fits into the\r\nstep-wise refinement process of design. The most important considerations in the\r\ndesign of this simulator were ease of expression and the provision of enough\r\ngenerality to allow the specification of any VLSI structure. Simulation takes place\r\nin a time axis/delay environment and uses a system in which nodes may take one of\r\nfour values or states. This allows a high level simulation in which physical devices\r\nare replaced by register transfer type operations. Data is altered and moved around\r\nusing flow control mechanisms, logical and mathematical operations, and various\r\nmeans of specifying delay. Though not necessary or typical it is possible to model\r\nactual devices as ideal switches using these techniques. It is a multi-model\r\nsimulation because simulation can occur at any level or design abstraction. Several\r\nexamples are given including the modelling or the GR2 stack data microprocessor\r\nwhich was recently fabricated in NMOS.
" }, { "name": "Whelan, Daniel Steven", "degree": "Masters", "year": "1981", "title": "A Versatile Ethernet Interface", "advisor": "Kajiya, James Thomas", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-112531771", "creators": [ { "name": { "family": "Whelan", "given": "Daniel Steven" }, "id": "Whelan-Daniel-Steven", "display_name": "Whelan, Daniel Steven" } ], "advisors": [ { "name": { "family": "Kajiya", "given": "James Thomas" }, "id": "Kajiya-J-T", "role": "advisor", "display_name": "Kajiya, James Thomas" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/x4t9-5n88", "abstract": "No abstract." }, { "name": "Whitney, Telle", "degree": "Masters", "year": "1981", "title": "A Hierarchical Design Rule Checker", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-100224959", "creators": [ { "name": { "family": "Whitney", "given": "Telle" }, "id": "Whitney-T", "display_name": "Whitney, Telle" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/dqz1-c122", "abstract": "This thesis describes a new approach to the problem of Geometrical Design Rule Checking (DRC). Previous DRC implementations have dealt with fully instantiated geometrical artwork. As the complexity of VLSI increases, it becomes infeasible to analyze the vast amounts of information present in a fully instantiated design. The\r\nDRC algorithm presented here introduces an approach that exploits the structural\r\nhierarchy of a design in order to reduce the computational complexity of the\r\ngeometrical tests that need to be made. The technique described is also applicable to\r\nother types of design checking such as circuit extraction, functional verification\r\nand electrical rule verification.
\r\n\r\nA new DRC algorithm has been developed that, by making use of the structure\r\ninherent in a hierarchical design, eliminates many redundant design rule checks.\r\nIn this approach there are two places where possible design rule violations may\r\noccur. The first is within a symbol definition. The second is the area where two\r\nsymbols interact. The algorithm checks a given definition only once, and then examines how interactions within each new environment where the definition is placed modify the original definition. A note is made after each interaction has been scrutinized, so that a duplicate situation will not be rechecked.
\r\n\r\nAn implementation of the hierarchical DRC algorithm has been written at Caltech.\r\nThis implementation extracts a minimal number of pairwise geometrical\r\ncomparisons needed to check the entire design. The program accepts as in put a\r\ndesign description in the Caltech Intermediate Form (CIF). The output of the program is currently a fully instantiated version of those portions of the geometry\r\nthat need to be checked in order to check the entire design.
\r\n\r\nA means of expressing the designer's intent through the design description is\r\nrequired. Current DRC's deal with geometrical artwork exclusively. Most of the\r\ndifficult design rules are involved in the checking of devices. Rather than\r\nrestricting the designer to the use of geometry, the idea of a primitive element is\r\nintroduced. A primitive element is defined to be anything that cannot be broken\r\ndown into sub-elements. A design defined using primitive elements conveys more\r\nof the functional structure than a purely geometric definition.
\r\n\r\n" }, { "name": "Demetrescu, Stefan Gabriel", "degree": "Masters", "year": "1980", "title": "A VLSI Based Real-Time Hidden Surface Elimination Display System", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04092012-133954577", "creators": [ { "name": { "family": "Demetrescu", "given": "Stefan Gabriel" }, "id": "Demetrescu-Stefan-Gabriel", "display_name": "Demetrescu, Stefan Gabriel" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/Z9GF0RGD", "abstract": "This thesis describes a novel approach to the problem of generating dynamic TV raster displays for real-time simulation (such as for visual flight simulation). In particular, the most time consuming part of generating such displays, the hidden surface elimination, is performed using many identical custom VLSI processors. Each processor is assigned a surface and, for each pixel, all processors compete to decide which object is visible.
\r\n\r\nIt is found that this approach leads to a practical system which is conceptually and practically simple, expandible, and reliable.
" }, { "name": "Lang, Charles Richard", "degree": "Masters", "year": "1980", "title": "Automated Wiring Analysis of Integrated Circuit Geometric Data", "advisor": "Seitz, Charles L.", "url": "https://resolver.caltech.edu/CaltechThesis:03092018-151643742", "creators": [ { "name": { "family": "Lang", "given": "Charles Richard" }, "id": "Lang-Charles-Richard", "display_name": "Lang, Charles Richard" } ], "advisors": [ { "name": { "family": "Seitz", "given": "Charles L." }, "id": "Seitz-C-L", "role": "advisor", "display_name": "Seitz, Charles L." } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "compsci" ], "doi": "10.7907/qxbg-2c10", "abstract": "Methods are presented by which wiring data of an NMOS integrated circuit may be extracted from its mask information. The procedures involved utilize the capabilities of a general purpose polygon package. The polygon operations are defined to enhance their use in this application, however the package is suitable for other uses such as, design rule checking. The analysis is performed on hierarchical symbol definitions of mask geometry. The geometry is presumed to be described in CIF 2.0 (Caltech Intermediate Form). The analysis attempts to recognize three basic types of structures in the geometry:
\r\n\r\n1)\tTransistor devices (and capacitors)
\r\n2)\tLocal interconnection structures and
\r\n3)\tGlobal interconnection structures
Definitions are put forth for the distinction of global and local wires. The data extracted from the symbol geometry is the percent utilization of each symbol's area by each of the three types of structures. The purpose behind the extraction of this data is its use in the development and evaluation of wiring models for custom NMOS IC design. Two approaches are presented which extract such data. The first is heuristic and depends on built-in assumptions of how the NMOS process is generally used. This technique loses accuracy if a design style falls outside of these assumptions. The second technique is a method by which the topology of design may be extracted from the geometry. The geometric objects, from which devices and interconnections are made, are preserved, such that the wiring information can be obtained precisely. This method is complex and requires considerable computation, however, the topology extracted may also be used to verify the geometric data against the original design topology.
" }, { "name": "Roach, Kelly", "degree": "Masters", "year": "1980", "title": "Pronouns", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04122012-102357778", "creators": [ { "name": { "family": "Roach", "given": "Kelly" }, "id": "Roach-K", "display_name": "Roach, Kelly" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/4zr9-xf65", "abstract": "No abstract." }, { "name": "Seiler, Larry Dean", "degree": "Masters", "year": "1980", "title": "A Pascal Machine Architecture Implemented in Bristle Blocks, a Prototype Silicon Computer", "advisor": "Mudge, J. Craig", "url": "https://resolver.caltech.edu/CaltechTHESIS:03122018-143833053", "creators": [ { "name": { "family": "Seiler", "given": "Larry Dean" }, "id": "Seiler-Larry-Dean", "display_name": "Seiler, Larry Dean" } ], "advisors": [ { "name": { "family": "Mudge", "given": "J. Craig" }, "id": "Mudge-J-C", "role": "advisor", "display_name": "Mudge, J. Craig" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "compsci" ], "doi": "10.7907/Z9VH5KTT", "abstract": "This thesis presents the multi-chip design of an architecture which directly implements the\r\nlanguage Pascal. The design uses custom VLSl rather than standard chips in order to\r\nincrease speed and reduce the number of chips needed.
\r\n\r\nThe integrated circuits comprising the architecture are designed using Bristle Blocks, a chip\r\ndesign tool developed at Caltech by Dave Johannsen (6). Bristle Blocks is called a silicon\r\ncompiler because it will put together an entire integrated circuit from a high level description\r\nof its function. Bristle Blocks can be used to design datapath processor chips, where\r\nexternal microcode is used to control operations on data busses inside the chip.
\r\n\r\nThe Pascal machine architecture presented here is based on the EM-1 instruction set\r\ndesigned by Andrew Tannenbaum (11,13). The EM-1 instruction set is intended to allow\r\nefficient compilation of stack-based, high level languages. Tannenbaum supplies static\r\nfrequency data which is used heavily in making design decisions in the Pascal machine\r\narchitecture.
\r\n\r\nVLSl design has several important differences from design using standard components. A\r\nlarge amount of function can be placed on a single chip, e.g., approximately 30,000\r\ntransistors on the Intel 8086, but only a small number of pins are available for off-chip\r\ncommunication (typically 64 or less). This requires designs to be highly modular. In the\r\nNMOS technology used at Caltech, driving signals off-chip takes up to ten times the time and\r\nenergy of on-chip communication. This requires inter-chip communication to be limited as\r\nmuch as possible. Finally, the large amount of computing power available in VLSl\r\nencourages the use of concurrency to gain execution speed.
\r\n\r\nThis thesis is structured as follows. The thesis begins with a section defining the principles\r\nto be followed in designing the Pascal system architecture. Following that are sections\r\ndescribing Bristle Blocks and the EM-1 architecture. Next, the overall architecture of the\r\nPascal machine is described, followed by sections detailing the system data busses, the\r\ncommon elements in the processors which make up the system, and the processors\r\nthemselves. A conclusion section summarizes the work, provides a brief critique of Bristle\r\nBlocks, and includes recommendations for further work. Finally, the appendices document\r\nthe Bristle Blocks datapath elements and the EM-1 instruction set.
" }, { "name": "Land, Leroy Cosby", "degree": "Masters", "year": "1948", "title": "A Study of Ceramic Liners for Uncooled Rocket Motor Chambers", "advisor": "Duwez, Pol E.", "url": "https://resolver.caltech.edu/CaltechTHESIS:05152025-025120886", "creators": [ { "name": { "family": "Land", "given": "Leroy Cosby" }, "id": "Land-Leroy-Cosby", "display_name": "Land, Leroy Cosby" } ], "advisors": [ { "name": { "family": "Duwez", "given": "Pol E." }, "id": "Duwez-P-E", "role": "advisor", "display_name": "Duwez, Pol E." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "mecheng" ], "doi": "10.7907/w5ej-dg18", "abstract": "The purpose of this study was to test certain ceramic liner materials in a liquid propelled, uncooled rocket motor chamber to determine the best type liner material and study the temperatures encountered on the chamber casing wall and the outer ceramic liner wall.
\r\nThe liner materials zirconia, zircon, beryllia and silicon carbide were tested in a stationary test rocket motor using acid-aniline propellant.
\r\nFrom this study it was determined that rocket motors using a zirconia chamber liner and operated under test conditions could be fired for periods up to approximately 220 seconds.
" }, { "name": "Amster, Warren", "degree": "Masters", "year": "1947", "title": "Calculation of the Static Longitudinal Stability of Multi-Engine Tractor-Propeller-Driven Monoplanes", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04132011-113934958", "creators": [ { "name": { "family": "Amster", "given": "Warren" }, "id": "Amster-Warren", "display_name": "Amster, Warren" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/P9X7-WM80", "abstract": "This report has three main purposes:
\r\n\r\n1. To establish an engineering computation procedure for predicting CM(c.g.) as a function of CL for a multi-engine monoplane of conventional configuration with tractor propellers mounted on and forward of the wing.
\r\n\r\n2. To recommend aircraft configurations which will minimize the destabilizing effect of power.
\r\n\r\n3. To provide a physical explanation for the effect of power on stability.
" }, { "name": "Boettcher, Richard Arns", "degree": "Masters", "year": "1947", "title": "Effect of Time of Loading on Shear Strength of Air Dried Douglas Fir", "advisor": "Martel, Romeo Raoul", "url": "https://resolver.caltech.edu/CaltechTHESIS:06022025-224636518", "creators": [ { "name": { "family": "Boettcher", "given": "Richard Arns" }, "id": "Boettcher-Richard-Arns", "display_name": "Boettcher, Richard Arns" } ], "advisors": [ { "name": { "family": "Martel", "given": "Romeo Raoul" }, "id": "Martel-R-R", "role": "advisor", "display_name": "Martel, Romeo Raoul" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/nehz-p061", "abstract": "No abstract." }, { "name": "Davis, Thomas V.", "degree": "Masters", "year": "1947", "title": "Brawley Power Plant in the May 18, 1940 Earthquake. Part I. Analogous Structures and Approximate Stresses", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:06042025-165143002", "creators": [ { "name": { "family": "Davis", "given": "Thomas V." }, "id": "Davis-Thomas-V", "display_name": "Davis, Thomas V." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/0zx5-c793", "abstract": "No abstract." }, { "name": "Duke, Charles Marsden", "degree": "Masters", "year": "1947", "title": "The Effect of Various Slopes of Breakwater Faces on the Amplitude of the Reflected Wave", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:06182025-233529609", "creators": [ { "name": { "family": "Duke", "given": "Charles Marsden" }, "id": "Duke-Charles-Marsden", "display_name": "Duke, Charles Marsden" }, { "name": { "family": "Page", "given": "Myron Ellsworth, Jr." }, "id": "Page-Myron-Ellsworth", "display_name": "Page, Myron Ellsworth, Jr." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/fvba-qa27", "abstract": "This investigation was undertaken to determine the variations in amplitude of the reflected wave when the initial wave is subjected to the effects of various slopes of breakwater faces. The investigation was conducted as one inch to forty foot model study the results of which may be of some value in further development of techniques and procedures at the California Institute of Technology's Hydraulics Model Laboratory and which may prove of some practical significance in the selection of breakwater slopes were the amplitude of the reflected waves is a major problem." }, { "name": "Flanders, Edward Aiken", "degree": "Masters", "year": "1947", "title": "Part I. Coral Limestone and Its Use. Part II. Chemical Stabilization of Coral Surfaces", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04232025-221448878", "creators": [ { "name": { "family": "Flanders", "given": "Edward Aiken" }, "id": "Flanders-Edward-Aiken", "display_name": "Flanders, Edward Aiken" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/g58k-2370", "abstract": "I. Coral Limestone and Its Use
\r\n\r\nLimestone of coral origin was abundantly used for construction\r\nof Military and Naval bases in the Pacific during World War II.\r\nIts use was almost always spectacularly successful and contributed\r\nlargely to the successful operations against the Japanese Empire.\r\nNevertheless a rigid analysis of the coral used reveals it to be a\r\nrather poor material. This study briefly reviews the theoretical\r\nconcepts of the origin of coral deposits and describes the nature of\r\nthe various types of deposits. From this a guide is established to\r\nassist the construction engineer in finding the coral he needs, sometimes\r\na difficult problem.
\r\n\r\nThe characteristics of coral deposits are explained and a\r\nmethod of processing the coral for desirable results is given, along\r\nwith the reasons for the method. A logical explanation for the\r\n\"setting up\" phenomena is established.
\r\n\r\nII. Chemical Stabilization of Coral Surfaces
\r\n\r\nThe possibility of chemical stabilization of the top surface\r\nof coral bases to prevent dust is explored. The process involved is\r\nanalysed and an order of magnitude of quantities determined. The\r\nnecessary experiments to prove the process and tentative field procedures\r\nare outlined.
" }, { "name": "Griswold, Lee Martin", "degree": "Masters", "year": "1947", "title": "Lawn Mower Design", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04242025-033816237", "creators": [ { "name": { "family": "Griswold", "given": "Lee Martin" }, "id": "Griswold-Lee-Martin", "display_name": "Griswold, Lee Martin" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eng" ], "doi": "10.7907/48jb-tg19", "abstract": "If you were to explore the lawn mower market today, you would find that lawn mowers are essentially the same now as when your grandfather or even great-grandfather used them. Hundreds of patents have been issued on ideas which supposedly were to improve lawn mowers. However, the basic lawn mower design as we have known it for years still stands as practically the only type of lawn mower sold today. The survival of this design through so many generations and the subsequent failure of so many other suggested designs certainly tends to humble anyone who endeavours to improve the lawn mower.
\r\nThe faults of the existing lawn mowers are very evident, objectionable and taunting to anyone interested in improving upon them. To be more specific, some of the faults are that lawn mowers are hard to push, unable to cut close to obstacles, cannot cut very tall grass, are noisy, are jammed easily by sticks and stones, and cannot cut properly the grass along the edges of troughs or gardens which are lower than the lev e 1 of the grass. The following thesis is an investigation directed toward the solution of these problems in the design of a lawn mower.
" }, { "name": "Harris, Robert Blynn", "degree": "Masters", "year": "1947", "title": "An Investigation in the Reduction of Tabulated Loads for Bolted Joints Fabricated of Green Douglas Fir", "advisor": "Martel, Romeo Raoul", "url": "https://resolver.caltech.edu/CaltechETD:etd-10062005-130130", "creators": [ { "name": { "family": "Harris", "given": "Robert Blynn" }, "id": "Harris-Robert-Blynn", "display_name": "Harris, Robert Blynn" } ], "advisors": [ { "name": { "family": "Martel", "given": "Romeo Raoul" }, "id": "Martel-R-R", "role": "advisor", "display_name": "Martel, Romeo Raoul" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/4D9Y-VF55", "abstract": "Because of restrictions and shortages of materials and labor caused by World War II, the lumber industry has been forced to place on the market a great deal of lumber that is in a green condition. Consequently designers and engineers have been required to make use of this material.\r\n\r\nSpecifications currently being used for the design of bolted joints in wood structures require that the allowable loads as tabulated therein be reduced when the material used is green. In most cases this reduction is in the order of two thirds the tabulated value, that is to say the allowable working stress is one third the tabulated value. The conservativeness of this requirement has been questioned and it has been the purpose of this investigation to attempt to arrive at a load reduction ratio which would give a greater allowable load and a subsequent saving in labor and materials." }, { "name": "Heidt, Herman", "degree": "Masters", "year": "1947", "title": "The Design of a Household Food Mixer", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04302025-205127399", "creators": [ { "name": { "family": "Heidt", "given": "Herman" }, "id": "Heidt-Herman", "display_name": "Heidt, Herman" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eng" ], "doi": "10.7907/4ngh-h587", "abstract": "No abstract." }, { "name": "Heller, William Edwin", "degree": "Masters", "year": "1947", "title": "An Analysis of the Stresses in the Wall Slab of a Counterforted Retaining Wall", "advisor": "Martel, Romeo Raoul", "url": "https://resolver.caltech.edu/CaltechTHESIS:09102024-002624636", "creators": [ { "name": { "family": "Heller", "given": "William Edwin" }, "id": "Heller-William-Edwin", "display_name": "Heller, William Edwin" } ], "advisors": [ { "name": { "family": "Martel", "given": "Romeo Raoul" }, "id": "Martel-R-R", "role": "advisor", "display_name": "Martel, Romeo Raoul" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/abs5-th87", "abstract": "The purpose of this paper is to analyze the stresses in the wall slab of a counterforted retaining wall and to determine from this analysis, if possible, whether or not the conventional method of design for the slab is economical.
\r\n\r\nThe conventional method of designing the wall slab of a counterforted retaining wall is to consider the wall as a series of independent horizontal strips between the counterforts. These strips are then designed either as continuous beams or as simple beams extending from one counterfort to the next. This method completely neglects the effect of cantilever action from the horizontal base slab where it joins the vertical wall. In the case of large counterfort spacing this effect may be considerable and it is possible that some reduction in material could be made if this effect were accounted for in the design calculations.
\r\n\r\nIn order to throw some light on the effect of neglecting the cantilever action, the following analysis has been made on a wall slab designed by the conventional method. The dimensions of the slab are as given in the drawing on page 5.
" }, { "name": "Kamath, Mundkur Vasudev", "degree": "Masters", "year": "1947", "title": "Design of an Instrument Panel for Automobiles", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:05192025-204838883", "creators": [ { "name": { "family": "Kamath", "given": "Mundkur Vasudev" }, "id": "Kamath-Mundkur-Vasudev", "display_name": "Kamath, Mundkur Vasudev" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eng" ], "doi": "10.7907/pqe0-w988", "abstract": "Since 1937 the automobile instrument panel has gained\r\nappreciably in importance as part of the interior design. The\r\npanel has also been receiving attention as an additional safety\r\nmeasure to meet the increasing consumer demand for safety factors\r\nin cars. The value of the panel as an influential sales point\r\nhas been stressed so much by dealers that definite efforts are\r\nbeing made to make the panel more attractive and distinctive.
\r\n\r\nThe problem of designing an instrument panel for automobiles\r\nhas been treated from the functional point of view. Careful\r\nanalysis of market and consumer research has been used to develop\r\na logical solution. Consideration has been given to efficient\r\ninstrument lay-out and convenient location of controls and panel\r\naccessories. A method for the suspension installation of the\r\npanel has been devised for shock absorption using the principle\r\nof friction braking. A new application of crash padding has also\r\nbeen added to avert serious head and knee injuries to passengers\r\nin accidents.
\r\n\r\nImproved instrument lay-out and lighting are claimed as\r\nadditional safety measures in this design, and all superficial\r\nstylizing eliminated.
" }, { "name": "Keck, Henry Chapman", "degree": "Masters", "year": "1947", "title": "Home Radio", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:06062025-181159664", "creators": [ { "name": { "family": "Keck", "given": "Henry Chapman" }, "id": "Keck-Henry-Chapman", "display_name": "Keck, Henry Chapman" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eng" ], "doi": "10.7907/jtz5-g327", "abstract": "No abstract." }, { "name": "King, Emmett Thomas", "degree": "Masters", "year": "1947", "title": "An Investigation and Design of a Set of Magnesium Luggage", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:05282025-202307566", "creators": [ { "name": { "family": "King", "given": "Emmett Thomas" }, "id": "King-Emmett-Thomas", "display_name": "King, Emmett Thomas" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eng" ], "doi": "10.7907/q2m6-b707", "abstract": "No abstract." }, { "name": "Montgomery, John Osmer", "degree": "Masters", "year": "1947", "title": "Some Criteria for Distinguishing Large Scale Weather Processes", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:08132025-183358936", "creators": [ { "name": { "family": "Montgomery", "given": "John Osmer" }, "id": "Montgomery-John-Osmer", "display_name": "Montgomery, John Osmer" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/yzj1-fk03", "abstract": "The concept of a large scale weather process covering\r\na hemisphere or perhaps the whole earth and lasting for\r\nperiods of twenty to thirty days presents some possible\r\nvalue as an aid in extending weather forecast periods\r\nbeyond those now used with any degree of confidence, In\r\ndefining and studying such processes various factors must\r\nbe considered such as tl1e general atmospheric circulation \r\ntrends and flow patterns, centers of high pressure and low\r\npressure action, and zones of convergence of airflow; and\r\nthe movement of these zones. Comprehensive charts, flow\r\npattern charts, or any other chart giving a broadscale\r\nweather picture over an extended period of time are of\r\nmuch use in making a subjective study. Statistical studies\r\nby computation of correlation coefficients or better yet by\r\nuse of contingency tables furnish a more objective view of\r\nthe problem. It is the purpose of this study to make preliminary\r\ninvestigations of these factors using some of these \r\ntechniques. From a study of these processes it is hoped\r\na procedure will be developed for forecasting the general\r\natmospheric flow pattern and from this a reasonable weather\r\nforecast for several weeks." }, { "name": "Powell, Orville Samuel", "degree": "Masters", "year": "1947", "title": "Luncheonette Design", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:05072025-200922226", "creators": [ { "name": { "family": "Powell", "given": "Orville Samuel" }, "id": "Powell-Orville-Samuel", "display_name": "Powell, Orville Samuel" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eng" ], "doi": "10.7907/1hv6-0866", "abstract": "No abstract." }, { "name": "Swatta, Frank Albert", "degree": "Masters", "year": "1947", "title": "A Study of the Effect of Vertical Sand Drains as a Means for the Rapid Consolidation of Soils of Low Permeability", "advisor": "Converse, Frederick James", "url": "https://resolver.caltech.edu/CaltechETD:etd-10062005-131350", "creators": [ { "name": { "family": "Swatta", "given": "Frank Albert" }, "id": "Swatta-Frank-Albert", "display_name": "Swatta, Frank Albert" } ], "advisors": [ { "name": { "family": "Converse", "given": "Frederick James" }, "id": "Converse-F-J", "role": "advisor", "display_name": "Converse, Frederick James" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/FB0G-N523", "abstract": "The phenomenon of consolidation or the settlement of soils under load is well known to civil engineering practice in all works dealing with earth movement and foundations. Unlike true elastic materials, this deformation takes place at a variable rate over an extended period of time and is especially apparent in clays saturated with water. This phenomenon was first explained by K. Terzaghi who assumed the soil mass to be an elastic porous medium with voids filled with water or the concept of a saturated rubber sponge. The deformation of such a mass upon application of a load would then be variable, depending upon the rate at which water was forced from the voids. The application of mathematical analysis to this concept led to the complete solution by Terzaghi for the one dimensional process to be followed by the studies of M. A. Biot, L. Rendulic and N. Carillo dealing with the three dimensional case." }, { "name": "Whitmore, Quentin Robert", "degree": "Masters", "year": "1947", "title": "Experimental Investigation of Temperature and Velocity Distribution About a Rocket Jet", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-12092008-140117", "creators": [ { "name": { "family": "Whitmore", "given": "Quentin Robert" }, "id": "Whitmore-Quentin-Robert", "display_name": "Whitmore, Quentin Robert" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics", "eleceng" ], "doi": "10.7907/SN1E-KS25", "abstract": "The purpose of the investigation was to determine the temperature distribution and velocity profile surrounding the wake of a 1500 pound thrust liquid rocket motor. The temperature measurements were restricted to those 500\u00b0F and below. The velocities measured were in the region in which the temperature measurements were made.\r\n\r\nThe region in which the temperatures exceeded 500\u00b0F was found to be included within a solid angle of ten degrees. The high temperature region was found to be larger than the high velocity region.\r\n\r\nThe investigation was carried out during the academic year 1946-1947 at GALCIT Jet Propulsion Laboratory under the supervision of Dr. Robert H. Boden.\r\n" }, { "name": "Yankauskas, Paul C. Jr.", "degree": "Masters", "year": "1947", "title": "Development of the Design of a High Frequency Gluing Machine", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04292025-170302802", "creators": [ { "name": { "family": "Yankauskas", "given": "Paul C. Jr." }, "id": "Yankauskas-Paul-C", "display_name": "Yankauskas, Paul C. Jr." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eng" ], "doi": "10.7907/t6mq-8y37", "abstract": "No abstract." }, { "name": "Zeigler, Clyde Calhoun", "degree": "Masters", "year": "1947", "title": "Compaction of Soil under Freezing Conditions and Subsequent Thawing", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:04022025-205121557", "creators": [ { "name": { "family": "Zeigler", "given": "Clyde Calhoun" }, "id": "Zeigler-Clyde-Calhoun", "display_name": "Zeigler, Clyde Calhoun" }, { "name": { "family": "Veale", "given": "Joseph Ernest" }, "id": "Veale-Joseph-Ernest", "display_name": "Veale, Joseph Ernest" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/2ssf-9335", "abstract": "This paper is a report of the investigation\r\nby laboratory and reference material of the practicability\r\nof compaction of frozen or freezing soils for\r\nsuch uses as airfields and roads. The work consisted\r\nof the determination of the major variable factors\r\ninvolved and an approximate verification in the laboratory\r\nof the effects of those factors. Three natural,\r\nsandy soils were tested, and the results indicate\r\ngenerally that use of frozen soils is probably limited\r\nto a very narrow range of moisture content near that\r\nof hygroscopic moisture and that their use rapidly\r\nbecomes less practicable as moisture contents increase\r\nand as soil gradation goes from the granular into the\r\nsilt and clay range." }, { "name": "Cox, Richard Horton", "degree": "Masters", "year": "1946", "title": "Water Resources on the Island of Kauai, Territory of Hawaii", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:08082025-004121402", "creators": [ { "name": { "family": "Cox", "given": "Richard Horton" }, "id": "Cox-Richard-Horton", "display_name": "Cox, Richard Horton" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/xmgd-5615", "abstract": "No abstract." }, { "name": "Dowd, Mudson White", "degree": "Masters", "year": "1946", "title": "An Analysis to Determine the Safe Yield of the Water Resources of San Diego County, California", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:11142024-042321844", "creators": [ { "name": { "family": "Dowd", "given": "Mudson White" }, "id": "Dowd-Mudson-White", "display_name": "Dowd, Mudson White" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/43s7-be59", "abstract": "As is indicated in the following report, the safe yield of the water resources of San Diego County is definitely limited. Proposals for future expansion indicate increased yield, hut they are expensive and their benefits limited. The City of San Diego has thus of necessity turned to an outside source., the Colorado River, as an adequate supply for the future. A pipeline is at present under construction\r\nfrom the Metropolitan Aqueduct to supplement the present system.
\r\n\r\nThis study is based principally- on data and figures found in the various reports enumerated in the bibliography. The subject is a very large one, which to be adequately covered would require voluminous amounts of data and much more time than is available. However, a general survey of the conditions prevailing in San Diego County and the approximate safe yields of all major rivers is included. It is suggested that any further investigations be made for yields of single rivers in order that thorough analyses can be conducted.
" }, { "name": "Finley, William L.", "degree": "Masters", "year": "1946", "title": "Effect of Unusually Deep Lows Upon Pressure Field of the Northern Hemisphere in Winter Months", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:06092025-202851517", "creators": [ { "name": { "family": "Finley", "given": "William L." }, "id": "Finley-William-L", "display_name": "Finley, William L." }, { "name": { "family": "Smith", "given": "Harvey Franklin" }, "id": "Smith-Harvey-Franklin", "display_name": "Smith, Harvey Franklin" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/jbp9-jq75", "abstract": "No abstract." }, { "name": "Jamele, Patrick Robert", "degree": "Masters", "year": "1946", "title": "3000 Dynamic Meter Ideal Charts Corresponding to the Ideal Surface Types for Zones 3 and 4: Progress Report", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:07172023-184648834", "creators": [ { "name": { "family": "Jamele", "given": "Patrick Robert" }, "id": "Jamele-Patrick-Robert", "display_name": "Jamele, Patrick Robert" }, { "name": { "family": "Lewis", "given": "Charles Hadley" }, "id": "Lewis-Charles-Hadley", "display_name": "Lewis, Charles Hadley" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/e9qp-1k67", "abstract": "This project was initiated in order to determine the correlation between the 3000 dynamic meter charts and corresponding surface charts which were used in formulating the ideal surface types as described in Report No. 2 CITAAF Research Unit (Project #32) October 31, 1945 entitled: \"Preparation of a Catalogue of Synoptic Weather Sequences for North America, January 1899 through June 1939.\"
\r\n\r\nThe patterns established by this work provide an additional aid in identification of weather types as well as giving some indication of wind directions and velocities to be expected aloft with a given surface type. These patterns reduced to slides for projection on a screen can also be used as a visual aid in presenting the characteristics of the various ideal types and especially to illustrate the steering effect of the upper winds.
" }, { "name": "Hege, Jeremiah Collins", "degree": "Masters", "year": "1945", "title": "An Experimental Investigation of the Effect of Lip on the Column Strength of Rolled Sheet Zee and Angle Sections", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechTHESIS:05242011-153838445", "creators": [ { "name": { "family": "Hege", "given": "Jeremiah Collins" }, "id": "Hege-Jeremiah-Collins", "display_name": "Hege, Jeremiah Collins" }, { "name": { "family": "Goebel", "given": "Thomas Parker" }, "id": "Goebel-Thomas-Parker", "display_name": "Goebel, Thomas Parker" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/HM7P-CK04", "abstract": "The hat section used by certain of the aircraft companies has been quite widely accepted as the most efficient compression carrying member when stiffened by a sheet. However, due to the difficulty of inspection and corrosion control, which is particularly important in naval aircraft, the Consolidated Vultee Aircraft Corporation has for some time been using open angle and zee sections formed from dural sheet. For this reason the members of the engineering staff of Consolidated Vultee became interested in the effect of lips on zee and angle sections such as are frequently used to stiffen panels occurring in the compression side of semi-monocoque structures subjected to bending loads.
\r\n\r\nThis paper is an attempt to determine experimentally the optimum amount of lip for the sections under consideration. Sufficient tests are made to locate the column curves for these sections, and from the curves the strengthening effect of the lip noted.
" }, { "name": "Curtis, Thomas Grey", "degree": "Masters", "year": "1944", "title": "A Model Study of Horizontal Pressures on a Retaining Wall Due to Concentrated Surface Loads and Electrical Strain Gauge Pressure Measurement", "advisor": "Converse, Frederick James; Hudson, Donald E.", "url": "https://resolver.caltech.edu/CaltechTHESIS:03312025-202919862", "creators": [ { "name": { "family": "Curtis", "given": "Thomas Grey" }, "id": "Curtis-Thomas-Grey", "display_name": "Curtis, Thomas Grey" }, { "name": { "family": "French", "given": "John Martin" }, "id": "French-John-Martin", "display_name": "French, John Martin" } ], "advisors": [ { "name": { "family": "Converse", "given": "Frederick James" }, "id": "Converse-F-J", "role": "advisor", "display_name": "Converse, Frederick James" }, { "name": { "family": "Hudson", "given": "Donald E." }, "id": "Hudson-D-E", "role": "advisor", "display_name": "Hudson, Donald E." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/f77f-tj19", "abstract": "No abstract." }, { "name": "Fox, Elmer Joseph", "degree": "Masters", "year": "1944", "title": "Forecasting Santa Ana Winds", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:05052025-165318444", "creators": [ { "name": { "family": "Fox", "given": "Elmer Joseph" }, "id": "Fox-Elmer-Joseph", "display_name": "Fox, Elmer Joseph" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/ame5-7042", "abstract": "No abstract." }, { "name": "Gayer, Martin Roger", "degree": "Masters", "year": "1944", "title": "Bolted Timber Joints", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:03312025-212000717", "creators": [ { "name": { "family": "Gayer", "given": "Martin Roger" }, "id": "Gayer-Martin-Roger", "display_name": "Gayer, Martin Roger" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/nnqs-1w59", "abstract": "No abstract." }, { "name": "Janes, Robert Lee", "degree": "Masters", "year": "1944", "title": "An Investigation of the Transverse Strength of Anchor Bolts in Concrete", "advisor": "Martel, Romeo Raoul; Converse, Frederick James", "url": "https://resolver.caltech.edu/CaltechTHESIS:05052025-182845559", "creators": [ { "name": { "family": "Janes", "given": "Robert Lee" }, "id": "Janes-Robert-Lee", "display_name": "Janes, Robert Lee" }, { "name": { "family": "Johnson", "given": "Carl Burdett" }, "id": "Johnson-Carl-Burdett", "display_name": "Johnson, Carl Burdett" } ], "advisors": [ { "name": { "family": "Martel", "given": "Romeo Raoul" }, "id": "Martel-R-R", "role": "advisor", "display_name": "Martel, Romeo Raoul" }, { "name": { "family": "Converse", "given": "Frederick James" }, "id": "Converse-F-J", "role": "advisor", "display_name": "Converse, Frederick James" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/315y-f858", "abstract": "No abstract." }, { "name": "Minasian, John Kachig", "degree": "Masters", "year": "1944", "title": "Comparative Results of Co-Operating Laboratories on the Shearing Resistance of Ottawa Sand", "advisor": "Converse, Frederick James", "url": "https://resolver.caltech.edu/CaltechTHESIS:03282025-184928531", "creators": [ { "name": { "family": "Minasian", "given": "John Kachig" }, "id": "Minasian-John-Kachig", "display_name": "Minasian, John Kachig" } ], "advisors": [ { "name": { "family": "Converse", "given": "Frederick James" }, "id": "Converse-F-J", "role": "advisor", "display_name": "Converse, Frederick James" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/yg5j-1643", "abstract": "No abstract." }, { "name": "Wayne, Jay C.", "degree": "Masters", "year": "1944", "title": "Flight Testing : Report", "advisor": "Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechTHESIS:06102025-185052730", "creators": [ { "name": { "family": "Wayne", "given": "Jay C." }, "id": "Wayne-Jay-C.", "display_name": "Wayne, Jay C." }, { "name": { "family": "Walkowicz", "given": "Teddy F." }, "id": "Walkowicz-Teddy-F.", "display_name": "Walkowicz, Teddy F." } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/xez2-cg73", "abstract": "No abstract." }, { "name": "Obenhaus, Gus F., Jr.", "degree": "Masters", "year": "1943", "title": "Construction of a Model Monogram to Show the Variation of Insolation with Season and Latitude", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:03102025-221810941", "creators": [ { "name": { "family": "Obenhaus", "given": "Gus F., Jr." }, "id": "Obenhaus-Gus-F", "display_name": "Obenhaus, Gus F., Jr." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/ffbp-s465", "abstract": "No abstract." }, { "name": "Caldwell, Norman Hubert", "degree": "Masters", "year": "1941", "title": "The Effect of Frontal Passages on Flight Restrictions at the Chicago, Omaha and Kansas City Terminals", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:02102025-224208680", "creators": [ { "name": { "family": "Caldwell", "given": "Norman Hubert" }, "id": "Caldwell-Norman-Hubert", "display_name": "Caldwell, Norman Hubert" }, { "name": { "family": "Oder", "given": "Frederic Carl Emil" }, "id": "Oder-Frederic-Carl-Emil", "display_name": "Oder, Frederic Carl Emil" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/82ey-9d50", "abstract": "No abstract." }, { "name": "Carlmark, Carl Wilbert", "degree": "Masters", "year": "1941", "title": "Types and Cycles of Summer Weather", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:02102025-213843694", "creators": [ { "name": { "family": "Carlmark", "given": "Carl Wilbert" }, "id": "Carlmark-Carl-Wilbert", "display_name": "Carlmark, Carl Wilbert" }, { "name": { "family": "Whitfield", "given": "Hervey Haydon" }, "id": "Whitfield-Hervey-Haydon", "display_name": "Whitfield, Hervey Haydon" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/143t-fb38", "abstract": "No abstract." }, { "name": "Ellsworth, Richard Elmer", "degree": "Masters", "year": "1941", "title": "Classification of 1937 Synoptic Charts and Type \"A\" Synoptic Situations", "advisor": "Krick, Irving Parkhurst", "url": "https://resolver.caltech.edu/CaltechTHESIS:02102025-193029564", "creators": [ { "name": { "family": "Ellsworth", "given": "Richard Elmer" }, "id": "Ellsworth-Richard-Elmer", "display_name": "Ellsworth, Richard Elmer" }, { "name": { "family": "Shores", "given": "Von Roy, Jr." }, "id": "Shores-Von-Roy-Jr.", "display_name": "Shores, Von Roy, Jr." } ], "advisors": [ { "name": { "family": "Krick", "given": "Irving Parkhurst" }, "id": "Krick-I-P", "role": "advisor", "display_name": "Krick, Irving Parkhurst" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/wpe9-j350", "abstract": "No abstract." }, { "name": "Fleming, Robert Ernst", "degree": "Masters", "year": "1941", "title": "The Mechanical and Nomographic Solution of RAOB and APOB Data", "advisor": "Stewart, Homer Joseph", "url": "https://resolver.caltech.edu/CaltechTHESIS:02122025-164242576", "creators": [ { "name": { "family": "Fleming", "given": "Robert Ernst" }, "id": "Fleming-Robert-Ernst", "display_name": "Fleming, Robert Ernst" } ], "advisors": [ { "name": { "family": "Stewart", "given": "Homer Joseph" }, "id": "Stewart-H-J", "role": "advisor", "display_name": "Stewart, Homer Joseph" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/dt2n-vj73", "abstract": "No abstract." }, { "name": "Hales, James Vern", "degree": "Masters", "year": "1941", "title": "Hourly Variation of the Total Insolation Incident Since Sunrise by Months for the Northern Hemisphere", "advisor": "Krick, Irving Parkhurst; Stewart, Homer Joseph", "url": "https://resolver.caltech.edu/CaltechTHESIS:02252025-191822008", "creators": [ { "name": { "family": "Hales", "given": "James Vern" }, "id": "Hales-James-Vern", "display_name": "Hales, James Vern" } ], "advisors": [ { "name": { "family": "Krick", "given": "Irving Parkhurst" }, "id": "Krick-I-P", "role": "advisor", "display_name": "Krick, Irving Parkhurst" }, { "name": { "family": "Stewart", "given": "Homer Joseph" }, "id": "Stewart-H-J", "role": "advisor", "display_name": "Stewart, Homer Joseph" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/x1aa-3826", "abstract": "No abstract." }, { "name": "Hill, Preston Louis", "degree": "Masters", "year": "1941", "title": "Micro-Photographic Record of Weather Maps", "advisor": "Krick, Irving Parkhurst", "url": "https://resolver.caltech.edu/CaltechTHESIS:05042012-114007483", "creators": [ { "name": { "family": "Hill", "given": "Preston Louis" }, "id": "Hill-Preston-Louis", "display_name": "Hill, Preston Louis" }, { "name": { "family": "Smith", "given": "Herman Walton" }, "id": "Smith-Herman-Walton", "display_name": "Smith, Herman Walton" } ], "advisors": [ { "name": { "family": "Krick", "given": "Irving Parkhurst" }, "id": "Krick-I-P", "role": "advisor", "display_name": "Krick, Irving Parkhurst" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/W9X0-6A94", "abstract": "No abstract." }, { "name": "Hubbard, Jack M.", "degree": "Masters", "year": "1941", "title": "Pressure as a Factor in the Prediction of Fog Formation", "advisor": "Krick, Irving Parkhurst", "url": "https://resolver.caltech.edu/CaltechTHESIS:01312025-171246433", "creators": [ { "name": { "family": "Hubbard", "given": "Jack M." }, "id": "Hubbard-Jack-M", "display_name": "Hubbard, Jack M." } ], "advisors": [ { "name": { "family": "Krick", "given": "Irving Parkhurst" }, "id": "Krick-I-P", "role": "advisor", "display_name": "Krick, Irving Parkhurst" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/dasg-d125", "abstract": "No abstract." }, { "name": "Kolb, Louis Lawrence", "degree": "Masters", "year": "1941", "title": "Cold Wave Phenomena : a 16 mm. Kodachrome Motion Picture of Clouds, Miniatures, and Weather Maps", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:01312025-172432116", "creators": [ { "name": { "family": "Kolb", "given": "Louis Lawrence" }, "id": "Kolb-Louis-Lawrence", "display_name": "Kolb, Louis Lawrence" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/0zv6-2r53", "abstract": "No abstract." }, { "name": "Levin, Gerald Balfour", "degree": "Masters", "year": "1941", "title": "Thunderstorm Mechanics", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:03042025-183312396", "creators": [ { "name": { "family": "Levin", "given": "Gerald Balfour" }, "id": "Levin-Gerald-Balfour", "display_name": "Levin, Gerald Balfour" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/wz0f-zp56", "abstract": "No abstract." }, { "name": "Stone, William Welch, Jr.", "degree": "Masters", "year": "1941", "title": "The Preparation of Monthly Streamlined Charts", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:02192025-225321818", "creators": [ { "name": { "family": "Stone", "given": "William Welch, Jr." }, "id": "Stone-William-Welch", "display_name": "Stone, William Welch, Jr." }, { "name": { "family": "Weir", "given": "Gordon Bruce" }, "id": "Weir-Gordon-Bruce", "display_name": "Weir, Gordon Bruce" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/ybrt-x588", "abstract": "No abstract." }, { "name": "Tiemann, Cordes Fredrich", "degree": "Masters", "year": "1941", "title": "A Study of the Type \"B\" Weather Situations", "advisor": "Krick, Irving Parkhurst", "url": "https://resolver.caltech.edu/CaltechTHESIS:01282025-185619009", "creators": [ { "name": { "family": "Tiemann", "given": "Cordes Fredrich" }, "id": "Tiemann-Cordes-Fredrich", "display_name": "Tiemann, Cordes Fredrich" }, { "name": { "family": "Miller", "given": "Joseph Alfred, Jr." }, "id": "Miller-Joseph-Alfred-Jr.", "display_name": "Miller, Joseph Alfred, Jr." } ], "advisors": [ { "name": { "family": "Krick", "given": "Irving Parkhurst" }, "id": "Krick-I-P", "role": "advisor", "display_name": "Krick, Irving Parkhurst" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/rkrn-q242", "abstract": "No abstract." }, { "name": "Weaver, Robert Lee", "degree": "Masters", "year": "1941", "title": "Cyclogenesis and Effect of Turbulence on Fronts in the Northern Great Plains: Part I. Cyclogenesis in the Northern Great Plains. II. Turbulence in the Frontogenetical Field", "advisor": "Krick, Irving Parkhurst", "url": "https://resolver.caltech.edu/CaltechTHESIS:04262025-235203883", "creators": [ { "name": { "family": "Weaver", "given": "Robert Lee" }, "id": "Weaver-Robert-Lee", "display_name": "Weaver, Robert Lee" }, { "name": { "family": "Johnson", "given": "Charles Benjamin" }, "id": "Johnson-Charles-Benjamin", "display_name": "Johnson, Charles Benjamin" } ], "advisors": [ { "name": { "family": "Krick", "given": "Irving Parkhurst" }, "id": "Krick-I-P", "role": "advisor", "display_name": "Krick, Irving Parkhurst" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/f2ag-se23", "abstract": "The aim of this paper is to classify certain types of weather developments that arise in the region east of the Rocky Mountains in Southern Canada, Montana, Wyoming, and Colorado, and to correlate their frequency and intensity with various factors which seem most important in their development.
\r\nAfter discussing briefly the importance of the Rocky Mountain chain as an air mass boundary, synoptic situations most favorable for fronto- and cyclogenesis are illustrated. The variation of these favorable situations with season is then compared with the frequency of occurrence of the several types of developments which they produce.
\r\nThe dates of initial eastward movement of secondary cyclone developments are correlated with dates of peaks in 14,000-foot pressure over the region. The influence of such wave developments on the buildup and dissipation of the Polar Canadian (Pc) high is studied.
\r\nFinally, a table of departure from normal temperatures is given for certain East Slope stations, during foehn wind frontogenesis.
" }, { "name": "Belsley, Steven Eric", "degree": "Masters", "year": "1940", "title": "The Determination of Two Parameters Dealing with Power-On Stability for a Model with Right Hand Propellers", "advisor": "Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechETD:etd-11142008-131655", "creators": [ { "name": { "family": "Belsley", "given": "Steven Eric" }, "id": "Belsley-Steven-Eric", "display_name": "Belsley, Steven Eric" } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/RPDT-VM86", "abstract": "This work presents expressions for determining the down-wash over the tail and the tail efficiency power-on and off. A method for the determination of empirical constants used by Millikan is presented. The method gives excellent agreement for the multiplicative factor Ap and good agreement for Bp. The theory checks experiment very well as Ap and Bp are nearly independent of Tc. " }, { "name": "Cabell, John Bell", "degree": "Masters", "year": "1940", "title": "Skewed Rigid Frame Bridge", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:12072024-132454125", "creators": [ { "name": { "family": "Cabell", "given": "John Bell" }, "id": "Cabell-John-Bell", "display_name": "Cabell, John Bell" }, { "name": { "family": "Gant", "given": "Edward Victor" }, "id": "Gant-Edward-Victor", "display_name": "Gant, Edward Victor" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/m5y6-hd75", "abstract": "No abstract." }, { "name": "Fischer, Harold S.", "degree": "Masters", "year": "1940", "title": "An Application of Matrix Methods to Wing Theory", "advisor": "von K\u00e1rm\u00e1n, Theodore; Sears, William Rees", "url": "https://resolver.caltech.edu/CaltechETD:etd-11142008-094640", "creators": [ { "name": { "family": "Fischer", "given": "Harold S." }, "id": "Fischer-Harold-S", "display_name": "Fischer, Harold S." } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Sears", "given": "William Rees" }, "id": "Sears-W-R", "role": "advisor", "display_name": "Sears, William Rees" } ], "committee": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "chair", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Stewart", "given": "Homer Joseph" }, "id": "Stewart-H-J", "role": "member", "display_name": "Stewart, Homer Joseph" }, { "name": { "family": "Rannie", "given": "W. Duncan" }, "id": "Rannie-W-D", "role": "member", "display_name": "Rannie, W. Duncan" }, { "name": { "family": "Sears", "given": "William Rees" }, "id": "Sears-W-R", "role": "member", "display_name": "Sears, William Rees" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/E1VN-SQ19", "abstract": "The calculation of spanwise lift distribution of a wing by a new method proposed by Theodore von Karman and W. R. Sears* depends on knowledge of certain \"characteristic values\" (eigenvalues) and \"characteristic functions\" (eigenfunctions) of the wing planform. These functions are solutions of a homogeneous boundary-value problem of the third kind.
\r\n\r\nIn the present paper the eigenvalues and the eigenfunctions, in series form, are calculated for a class of planforms by the method of successive multiplication of matrices.
\r\n\r\nThe class of planforms considered is that of trapezoidal wings with rounded tips. The eigenvalues and eigenfunctions are calculated for taper ratios 1:1, 2:1, 3:1, and 4:1; they are independent of aspect ratio. It is found, that for intermediate taper ratios they can be determined with reasonable accuracy by graphical interpolation.
\r\n\r\n* To be published shortly.
" }, { "name": "Fredrick, Joseph Louis", "degree": "Masters", "year": "1940", "title": "The Failure of Thin-Walled Semi-Elliptical Cylinders Under Torsion", "advisor": "von K\u00e1rm\u00e1n, Theodore; Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-11132008-142412", "creators": [ { "name": { "family": "Fredrick", "given": "Joseph Louis" }, "id": "Fredrick-Joseph-Louis", "display_name": "Fredrick, Joseph Louis" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/31X1-Q070", "abstract": "This paper constitutes a report on one phase of an investigation sponsored by the National Advisory Committee for Aeronautics at the California Institute of Technology, namely, the determination of the allowable loads in wing nose-sections under the action of combined loading conditions. As intimated by the title, the material presented here has been limited to the case of pure torsion only, this choice being dictated by the present state of the experimental program and the interpretation of its results.\r\n\r\nThe experimental program itself consisted of the testing of specimens made up of two semi-elliptical (or semi-circular) segments of sheet supported and clamped at the ends of the minor axis of the ellipse, thus simulating two wing nose-sections mounted to a common spar and tested as a single unit. As a result of the testing of these specimens with varying ellipticity, sheet thickness, and length, sufficient experimental data was obtained to establish rational design curves for both the buckling and ultimate failure of semi-elliptical cylinders under torsion.\r\n\r\nSince the type of specimens used only approximated the shape of an actual wing nose-section, it was necessary to devise a means of relating the two structures, in order that the criteria presented in this paper could be used for actual design practice.\r\n\r\nSince a limited amount of torsion tests on actual wing assemblies was available to this author, it was used to check the validity of both the geometric relation devised between the two types of structures as mentioned above and the actual design criteria developed from the experimental results. The agreement obtained was quite good, thus substantiating the usefulness and reliability of the results presented in this paper.\r\n\r\nIn the light of the above results, it is believed that the experimental portion of the investigation has been satisfactorily completed, with the possible exception of determining the affect of stiffeners upon the strength of the cylinders under discussion. However, since this represents an entirely different field of study, it is beyond the scope of this present investigation and must be relegated to the future.\r\n\r\nAttempts were made to develop a theoretical verification of the results obtained, but due to the complexities of the problem, they met with little success for the present. Therefore, this task also remains as one to be completed as a part of any future work which may be undertaken.\r\n" }, { "name": "Gentner, William Ellis", "degree": "Masters", "year": "1940", "title": "A Study of the Effect of Repeated Tension Impact Loads Upon Certain Metals Used in Aircraft Construction", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechTHESIS:04252011-080056433", "creators": [ { "name": { "family": "Gentner", "given": "William Ellis" }, "id": "Gentner-William-Ellis", "display_name": "Gentner, William Ellis" }, { "name": { "family": "Biglow", "given": "James Otis" }, "id": "Biglow-James-Otis", "display_name": "Biglow, James Otis" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/93VQ-ED36", "abstract": "The Impact Endurance Limit is evaluated for several materials used in aircraft construction. The Impact Endurance Limit is defined as the energy per blow in tension impact below which the specimen will withstand an indefinitely large number of blows without fracture.\r\n\r\nThe effect of grain orientation on the Impact Endurance Limit is shown.\r\n\r\nEvidence is presented that the Impact Endurance Limit may be a function of the ultimate tensile strength but not of the elongation or the yield point.\r\n\r\nThe effect of service stresses on the Impact Endurance Limit is discussed.\r\n" }, { "name": "Hatton, George Anthony", "degree": "Masters", "year": "1940", "title": "The Longitudinal Stability of a Flying-Boat in the Planing Condition as Computed from Tank Test Data of a Hull Model", "advisor": "von K\u00e1rm\u00e1n, Theodore; Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechETD:etd-11142008-082321", "creators": [ { "name": { "family": "Hatton", "given": "George Anthony" }, "id": "Hatton-George-Anthony", "display_name": "Hatton, George Anthony" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/JR58-MH75", "abstract": "The question of \u201cporpoising\u201d of flying-boats has been the subject of investigation both abroad and in the United States. In Germany and England recourse has been had to the use of dynamically similar models, duplicating in the model as closely as possible all the features of the full scale flying-boat. In the towing tanks of the United States, usually a bare hull is tested, where measurements are made of resistance, load, trimming moment, and trim angle at various speeds. The results are usually furnished in the form of curves of trimming moment and draft against speed at various loadings and trim angles. Conclusions regarding \u201cporpoising\u201d of the full scale flying-boat cannot be drawn from the behavior of the hull alone, but it is considered possible to evaluate certain hydrodynamic stability derivatives, which, in conjunction with aerodynamic derivatives obtained from wind-tunnel tests, may be used in the stability equation to determine the behavior of the flying-boat in the planning condition.\r\n\r\nIn the following discussion the aerodynamic and hydrodynamic derivatives are deduced. The aerodynamic derivatives are similar to those normally used for airplanes, but they are evaluated in terms of beam, trim angle, and other hydrodynamic terms; then the hydrodynamic derivatives are deduced, also in terms of hull dimensions and attitudes. This permits direct addition of the hydrodynamic and aerodynamic derivatives for use in the longitudinal stability equation. The criteria of stability then are applied. In addition, a factorization of the stability quartic, formulated by Dr. Millikan, is applied to determine periods of the oscillations, as well as damping factors.\r\n\r\nAn example following the procedure above outlined and devised by Dr. Millikan is presented, using tank test data of a model 36 hull for hydrodynamic quantities. The aerodynamic quantities are based on an average of many modern flying-boats. The model 36 hull is selected as being fairly representative of present day flying boats.\r\n" }, { "name": "Koch, Walter Louis", "degree": "Masters", "year": "1940", "title": "An Experimental Investigation of Wind Tunnel Wall Interference on Rolling and Yawing Moments Due to Deflected Ailerons", "advisor": "von K\u00e1rm\u00e1n, Theodore; Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechETD:etd-10282005-141733", "creators": [ { "name": { "family": "Koch", "given": "Walter Louis" }, "id": "Koch-Walter-Louis", "display_name": "Koch, Walter Louis" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/MN6W-EB71", "abstract": "Wind tunnel tests were made on a model wing with deflected ailerons in both open- and closed-jet configurations of a small wind tunnel. Rolling and yawing moments and lift were measured at various angles of attack. The wind tunnel wall interference on rolling and yawing moments is determined by comparison of the open- and closed-jet results. An approximate comparison with available theories is included. It appears that the interference effects measured are somewhat smaller than predicted by the theories.\r\n" }, { "name": "Kybal, Dalimil", "degree": "Masters", "year": "1940", "title": "The Aileron Influence on Wing Flutter", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechTHESIS:08212024-205858806", "creators": [ { "name": { "family": "Kybal", "given": "Dalimil" }, "id": "Kybal-Dalimil", "display_name": "Kybal, Dalimil" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/46zn-zn97", "abstract": "No abstract." }, { "name": "Moyers, Frank Neff", "degree": "Masters", "year": "1940", "title": "A Comparison of Theoretical and Experimental Pressure Distributions at High Speed About the N.A.C.A. 4412 Airfoil", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-09152005-142724", "creators": [ { "name": { "family": "Moyers", "given": "Frank Neff" }, "id": "Moyers-Frank-Neff", "display_name": "Moyers, Frank Neff" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/YTRV-NM88", "abstract": "The general problem of aerodynamics is the determination of the forces and moments imposed on a stationary body immersed in a moving fluid. The problem is soluble if a mathematical calculation of the velocity distribution throughout the fluid can be made. The application of certain restrictions facilitates the calculation. Without great loss of usefulness we may restrict the motion to a steady, uniform, and rectilinear flow from infinity. With considerable loss of usefulness but with tremendous simplification in calculation we may add the further restrictions that the fluid be non-viscous and incompressible. Upon these assumptions the problem may be solved by utilizing two physical relationships, namely, the equations of motion and continuity." }, { "name": "Nagamatsu, Henry Takeshi", "degree": "Masters", "year": "1940", "title": "Experimental Investigation of Ultimate Loads Carried by Flat, Unstiffened Panels Under Combined Shear and Compression", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-11142008-140614", "creators": [ { "name": { "family": "Nagamatsu", "given": "Henry Takeshi" }, "id": "Nagamatsu-Henry-Takeshi", "display_name": "Nagamatsu, Henry Takeshi" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/FNQF-4Q12", "abstract": "NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.\r\n\r\nThe behavior of flat, unstiffened panels was investigated for two length over width ratios and five thicknesses. In each case the panels were loaded until they failed. An empirical relation was developed for the variation of the ultimate combined shear and compression stress of the form [...].\r\n\t\r\nThe values of m and n were found to be: m = 1.65 and n = .9 for panels with length over width ratio equal to 2, and m = 1.4 and n = 1.3 for panels with length over width ratio equal to 1 1/3. The above equations agree very closely with the experimental results.\r\n\r\nThere was a variation in the apparent shear modulus under different combined loading conditions, but no definite result was obtained.\r\n" }, { "name": "Powell, Walter Brown", "degree": "Masters", "year": "1940", "title": "An Investigation of Some Problems in the Design of Tailless Airplanes", "advisor": "Millikan, Clark Blanchard; Sears, William Rees", "url": "https://resolver.caltech.edu/CaltechETD:etd-11252008-112304", "creators": [ { "name": { "family": "Powell", "given": "Walter Brown" }, "id": "Powell-Walter-Brown", "display_name": "Powell, Walter Brown" } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" }, { "name": { "family": "Sears", "given": "William Rees" }, "id": "Sears-W-R", "role": "advisor", "display_name": "Sears, William Rees" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/PZW5-2085", "abstract": "Some problems in the design of tailless airplanes are discussed. The conditions essential to the flight of such airplanes are determined, and a survey of methods of calculating the aerodynamic characteristics of plain wings and wings with flaps and ailerons deflected is presented. The effect of adding a fuselage and ring nacelles to a wing to form a practical airplane is discussed.
\r\n\r\nConsideration is given to the problem of damping of longitudinal oscillations, and a method of calculating the damping in pitch of a sweptback wing alone is presented.
\r\n\r\nAn example is carried through to illustrate the application of all the material covered in the paper. In all respects considered, the tailless airplane is shown to be comparable to normal type airplanes.
" }, { "name": "Sparks, Brian Orville", "degree": "Masters", "year": "1940", "title": "The Effects of Vertical Gusts on an Elastic Wing", "advisor": "Sears, William Rees", "url": "https://resolver.caltech.edu/CaltechETD:etd-11142008-144847", "creators": [ { "name": { "family": "Sparks", "given": "Brian Orville" }, "id": "Sparks-Brian-Orville", "display_name": "Sparks, Brian Orville" } ], "advisors": [ { "name": { "family": "Sears", "given": "William Rees" }, "id": "Sears-W-R", "role": "advisor", "display_name": "Sears, William Rees" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/20SK-0031", "abstract": "The case of a wing flexible in bending and rigid in torsion entering a vertical gust is treated by consideration of the corresponding two-dimensional case. The bending stiffness of the wing is expressed as a spring constant, the aerodynamic forces acting are taken from the two-dimensional theory of airfoils in non-uniform motion, and the differential equation of motion of the wing is solved by operational methods.
\r\n\r\nCases of sharp-edged and exponentially graded gusts are considered, and in each case the deflection is calculated in dimensionless form for three values of a dimensionless stiffness parameter. As a numerical example these results are put into dimensional form for a wing whose elastic properties are supposed to be typical of modern airplane wings.
\r\n\r\nThe results obtained for the cases considered show only in one instance a maximum deflection greater than the steady-state value. Even in the sharp-gust case the deflection increases comparatively slowly following the entrance of the wing into the gust. The effects of grading the gust are to decrease slightly the rate of deflection and to reduce the amplitude of the oscillations produced by the gust.
" }, { "name": "Ashkenas, Irving Louis", "degree": "Masters", "year": "1939", "title": "Wind Tunnel Model Tests to Investigate the Effects of Boundary Layer Control", "advisor": "Millikan, Clark Blanchard; Sears, William Rees", "url": "https://resolver.caltech.edu/CaltechETD:etd-05222007-104409", "creators": [ { "name": { "family": "Ashkenas", "given": "Irving Louis" }, "id": "Ashkenas-Irving-Louis", "display_name": "Ashkenas, Irving Louis" }, { "name": { "family": "Smith", "given": "Robert Beaton" }, "id": "Smith-Robert-Beaton", "display_name": "Smith, Robert Beaton" } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" }, { "name": { "family": "Sears", "given": "William Rees" }, "id": "Sears-W-R", "role": "advisor", "display_name": "Sears, William Rees" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/FE14-GP68", "abstract": "This thesis presents a study of the results obtained with the Boundary Layer Removal Model of the Guggenheim Aeronautics Laboratory, California Institute of Technology (GALCIT). It is a continuation of work begun here some time past and, as such, contains very little in the way of historical review, the origin of the project, preliminary studies of the problem and experimental technique being contained in previous reports.
\r\n\r\nThe attempt, in this series of tests, to find a definite scale effect on the power required to produce a given change in airfoil characteristics has been somewhat unsuccessful because the test Reynolds Numbers unfortunately fell in the region of critical Reynolds Number. There has, however, been some success in finding the definite mechanism by which boundary layer removal is effective, a logical explanation being given for the nature and magnitude of various changes in airfoil characteristics incurred by the use of a given amount of suction.
" }, { "name": "Beardsley, George Francis", "degree": "Masters", "year": "1939", "title": "A Study of the Effect of Repeated Tension Impact Loads Upon Certain Metals Used in Aircraft Construction", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-01102006-132339", "creators": [ { "name": { "family": "Beardsley", "given": "George Francis" }, "id": "Beardsley-George-Francis", "display_name": "Beardsley, George Francis" }, { "name": { "family": "Coates", "given": "Leonidas Dixon" }, "id": "Coates-Leonidas-Dixon", "display_name": "Coates, Leonidas Dixon" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/R4GM-7G81", "abstract": "A test method is developed for evaluating the Impact Endurance Limit of a material. The Impact Endurance Limit is defined as the energy per blow in tensile impact loading below which the specimen will withstand an indefinitely large number of blows without rupture, and this value is given for ALCOA 24ST and 14ST, with and across the grain, and Dowmetals X and Z-1 with the grain. Evidence is presented that this value probably does not depend directly either on the energy absorbed in breaking in one blow or on the brittleness of the material.\r\n\r\nThe ability to absorb energy in failure under static loading is shown to decrease nearly linearly with dynamic strain, while the ability to carry design static load is not adversely affected by any amount of dynamic strain short of failure.\r\n\r\nSome shortcomings of the present test methods are pointed out and a new machine is briefly described which will be used in further investigation of repeated tension impact.\r\n\r\nCo-author: L.D. Coates" }, { "name": "Fan, Hsu-Tsi", "degree": "Masters", "year": "1939", "title": "A Study of \"Shear Lag\" Phenomenon in a Stiffened Flat Panel by Photoelastic Methods", "advisor": "von K\u00e1rm\u00e1n, Theodore; Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-12282005-161537", "creators": [ { "name": { "family": "Fan", "given": "Hsu-Tsi" }, "id": "Fan-Hsu-Tsi", "display_name": "Fan, Hsu-Tsi" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/WANC-TP12", "abstract": "In the construction of modern metal airplanes there are many locations where a more or less concentrated load is transferred to a large area of material. Therefore the design-engineer is frequently confronted with the problem of \u201cshear lag.\u201d This problem can be treated in a few simple cases by the mathematical theory of elasticity, especially by Airy\u2019s stress functions, but in many other cases, in order to avoid mathematical complexities, certain assumptions must be made which will simplify the analytical solution of the problem. These assumptions usually do not agree with the actual conditions therefore the results are not adequate. By the photoelastic method, however, the results obtained by the mathematical theory can be checked. It is the purpose of this experiment to check the results which have been obtained by the theoretical investigation for a few simple cases." }, { "name": "Folkins, Richard Wilson", "degree": "Masters", "year": "1939", "title": "Experimental Research on the Problem of Determining the Maximum Moisture Content of Soils Under Footings by Means of Laboratory Vacuum Tests", "advisor": "Converse, Frederick James", "url": "https://resolver.caltech.edu/CaltechTHESIS:04152025-203756236", "creators": [ { "name": { "family": "Folkins", "given": "Richard Wilson" }, "id": "Folkins-Richard-Wilson", "display_name": "Folkins, Richard Wilson" }, { "name": { "family": "Sidler", "given": "Arthur William" }, "id": "Sidler-Arthur-William", "display_name": "Sidler, Arthur William" } ], "advisors": [ { "name": { "family": "Converse", "given": "Frederick James" }, "id": "Converse-F-J", "role": "advisor", "display_name": "Converse, Frederick James" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/56mm-bp36", "abstract": "No abstract." }, { "name": "Gringorten, Irving I.", "degree": "Masters", "year": "1939", "title": "Upper Wind Components and Forecasting", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:12172024-170211031", "creators": [ { "name": { "family": "Gringorten", "given": "Irving I." }, "id": "Gringorten-Irving-I", "display_name": "Gringorten, Irving I." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/4s8z-st73", "abstract": "No abstract." }, { "name": "Jackson, Andrew McBurney", "degree": "Masters", "year": "1939", "title": "An Investigation of Forced Flexural Torsional Oscillations of a Wing and the Phenomenon of Flutter", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-03252005-082813", "creators": [ { "name": { "family": "Jackson", "given": "Andrew McBurney" }, "id": "Jackson-Andrew-McBurney", "display_name": "Jackson, Andrew McBurney" }, { "name": { "family": "Parish", "given": "Elliott Walter" }, "id": "Parish-Elliott-Walter", "display_name": "Parish, Elliott Walter" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/V7TP-Q228", "abstract": "In this thesis the torsional-flexural response of a two-dimensional airfoil to forced oscillations of various frequencies and at various airspeeds is investigated. The airfoil chosen has characteristics which are typical of modern American transport wings, and the speeds cover the range from zero airspeed up through the speeds for torsional-flexural flutter and torsional divergence.
\r\n\r\nIn the latter part of this thesis, curves are plotted showing the effects which changes in the assumed wing parameters have on the torsional-flexural flutter speed and the torsional divergence speed.
" }, { "name": "Kanemitsu, Sunao", "degree": "Masters", "year": "1939", "title": "Axial Compression Test of Thin Circular Cylinders. A. Length Effect. B. Visual Study of Buckling", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-12052005-105325", "creators": [ { "name": { "family": "Kanemitsu", "given": "Sunao" }, "id": "Kanemitsu-Sunao", "display_name": "Kanemitsu, Sunao" }, { "name": { "family": "Nojima", "given": "Noble M." }, "id": "Nojima-Noble-M", "display_name": "Nojima, Noble M." } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/HBZ9-MZ48", "abstract": "A: This portion of the report contains results obtained from compression tests on 95 thin-walled steel circular cylinder. The tested cylinders were mainly of very small L/R ratio and large R/t ratio.
\r\n\r\nThe results are compared with the existing theoretical failing stresses and are also presented in a non dimensional form, \u03b4/E. The failure stress is best given by the equation \u03b4/E = 9(t/R)1.6 + .16(T/L)1.3. This equation shall be limited for use for L/R greater than 0.1 and for L/R greater than 1.5 assume L/R = 1.5.
\r\n\r\nB: A visual study of buckle formation is presented to aid future research which may be done on compression of thin cylinders.
" }, { "name": "Piper, Clark Neil", "degree": "Masters", "year": "1939", "title": "Experimental Investigation of the Profile Drag and Boundary Layer of a Wing Section During Free Flight and in the Wind Tunnel", "advisor": "Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechETD:etd-01092006-142449", "creators": [ { "name": { "family": "Piper", "given": "Clark Neil" }, "id": "Piper-Clark-Neil", "display_name": "Piper, Clark Neil" } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/DSRZ-HZ95", "abstract": "A general report covering the method used in obtaining flight test and wind tunnel data for the investigation of profile drag and the thickness of the boundary layer with its transition point is presented, together with some of the results and conclusions reached.\r\n\r\nMethods of data reduction with the difficulties encountered are given. After final results of the profile drag for flight test are obtained, they are compared with T. N. 695.\r\n\r\nA detailed description of the apparatus with the technique used for both the flight tests and the wind tunnel is also presented.\r\n" }, { "name": "Serrell, Peter Van Horne", "degree": "Masters", "year": "1939", "title": "The Design of a Remote Reading Extensometer", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-10282005-144806", "creators": [ { "name": { "family": "Serrell", "given": "Peter Van Horne" }, "id": "Serrell-Peter-Van-Horne", "display_name": "Serrell, Peter Van Horne" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "mecheng" ], "doi": "10.7907/FDWF-JQ52", "abstract": "No abstract submitted." }, { "name": "Sheppard, Herbert Ramsey", "degree": "Masters", "year": "1939", "title": "Experimental Determination of Pressure Distribution Under a Combined Footing", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:12132024-170046744", "creators": [ { "name": { "family": "Sheppard", "given": "Herbert Ramsey" }, "id": "Sheppard-Herbert-Ramsey", "display_name": "Sheppard, Herbert Ramsey" }, { "name": { "family": "Carrick", "given": "Harry Hall, Jr." }, "id": "Carrick-Harry-Hall", "display_name": "Carrick, Harry Hall, Jr." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/qrds-yr03", "abstract": "No abstract." }, { "name": "Tsubota, George Yoshio", "degree": "Masters", "year": "1939", "title": "Experimental Investigation of Ultimate Loads Carried by Flat, Unstiffened Panels Under Combined Shear and Compression", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-12222005-104133", "creators": [ { "name": { "family": "Tsubota", "given": "George Yoshio" }, "id": "Tsubota-George-Yoshio", "display_name": "Tsubota, George Yoshio" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/ZDZH-Y940", "abstract": "NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.\r\n\r\nThe problem of the behavior of flat, unstiffened panels under combined shear and compression load was investigated for one length over width ratio and three thicknesses. Due to the lack of data obtained in a limited amount of time, no definite conclusion was reached. Until further investigation is carried out, the ultimate failure stress relationship of [...] is recommended. The effect of shear load on the modulus of elasticity and compression load on the shear modulus was found to be nonexistent.\r\n" }, { "name": "Wang, Tsun-Kuei", "degree": "Masters", "year": "1939", "title": "A Theoretical Investigation of the Distribution of Maximum Shearing Stresses in a Stiffened Flat Panel", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-04142008-083306", "creators": [ { "name": { "family": "Wang", "given": "Tsun-Kuei" }, "id": "Wang-Tsun-Kuei", "display_name": "Wang, Tsun-Kuei" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/A1JY-DH94", "abstract": "No abstract submitted.\r\n" }, { "name": "Bell, Willard Newton", "degree": "Masters", "year": "1938", "title": "A Photoelastic Investigation of the Distribution of Shearing Stresses in a Stiffened Flat Panel", "advisor": "Sechler, Ernest Edwin; von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-01102006-131047", "creators": [ { "name": { "family": "Bell", "given": "Willard Newton" }, "id": "Bell-Willard-Newton", "display_name": "Bell, Willard Newton" }, { "name": { "family": "Bussey", "given": "John Kenneth" }, "id": "Bussey-John-Kenneth", "display_name": "Bussey, John Kenneth" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" }, { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/9JFS-SF60", "abstract": "No abstract.\r\n" }, { "name": "Berler, Irving", "degree": "Masters", "year": "1938", "title": "The Elastic Properties of 17ST Aluminum Alloy Tubing Including the Effects of Prestressing", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechTHESIS:02272025-192811948", "creators": [ { "name": { "family": "Berler", "given": "Irving" }, "id": "Berler-Irving", "display_name": "Berler, Irving" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/cz5j-jz92", "abstract": "No abstract." }, { "name": "Bowen, William Harold", "degree": "Masters", "year": "1938", "title": "Tests of Axial Flow Fans Designed by Lattice Theory", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-02122007-144119", "creators": [ { "name": { "family": "Bowen", "given": "William Harold" }, "id": "Bowen-William-Harold", "display_name": "Bowen, William Harold" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/M6E1-0T44", "abstract": "This paper presents the tests and calibrations which were made on three axial flow fan units of the G.A.L.C.I.T. Boundary Layer Removal Model in order that operating parameters might be developed from the data. The tests serve also as a check on the success achieved in the design of fans using the Lattice Theory. (cf. Theoretical Aerodynamics Lecture Notes of Dr. Clark B. Millikan).\r\n" }, { "name": "Butterworth, Wesley Theodore", "degree": "Masters", "year": "1938", "title": "Experimental Investigation of Ultimate Loads Carried by Flat, Unstiffened Panels Under Combined Shear and Compression", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-12282005-095455", "creators": [ { "name": { "family": "Butterworth", "given": "Wesley Theodore" }, "id": "Butterworth-Wesley-Theodore", "display_name": "Butterworth, Wesley Theodore" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/C57T-2C92", "abstract": "Four series of tests were made on flat, unstiffened panels under combined shear and compression loading for two thicknesses and two length over width ratios. In each case, the panels were carried to their ultimate loads. An empirical relation was developed for the variation of shear and compressive stresses of the form: (Pc/Pco) + (Ps/Pso)4 = 1,
\r\nwhere:
\r\nPco = failure stress, pure compression,
\r\nPso = failure stress, pure shear.
\r\nThe above equation was found to hold for the entire range of thicknesses and length over width ratios investigated.
The extensive use of reinforced duralumin sheet in aircraft construction makes it desirable to know the behaviour of such structures under load. This paper deals principally with the experimental results obtained by testing a large number of reinforced panels of various lengths under direct compression.
\r\n\r\nThe main purpose of the investigation was to determine the ultimate stresses in the reinforcing members, which in this case were bulb-angles of a size commonly used in aircraft constrution. It was, however, felt that it would be desirable to obtain as much information from the tests as possible. Consequesntly the stresses in the bulb-angles were measured at intermediate loads for a number of panels. From this data it was possible to determine that portion of the total load carried by either the skin or the bulb-angles throughout the entire range of load.
\r\n" }, { "name": "Dykes, John Christopher", "degree": "Masters", "year": "1938", "title": "Stability Derivatives of Helicopter Rotors", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-10282005-161504", "creators": [ { "name": { "family": "Dykes", "given": "John Christopher" }, "id": "Dykes-John-Christopher", "display_name": "Dykes, John Christopher" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/N0GE-EA65", "abstract": "At present there are only three published papers dealing with the stability of helicopters, all based on helicopters with rigid rotors. Since all rotors are, in practice, constructed with the blades free to \"flap\", these analyses are not sufficiently general.
\r\n\r\nBelow, the blade motion equation has been written in terms of small incremental accelerations and velocities; for which an approximate solution is obtained. This is then used to calculate the actual forces and moments that are produced on the rotor; by taking suitable mean values, it has been found possible to express these forces and moments without reference to the actual position of the blades at that instant, but only as functions of the position of the whole helicopter. The aerodynamic mechanism of the rotor has therefore been expressed in a a series of equations, and the stability of the helicopter now becomes solely a dynamical problem.
\r\n\r\nIt appears that a helicopter is most likely to become unstable when hovering; this analysis is confined to this case.
\r\n\r\nCalculated values for a helicopter of the same size as the \"C.30\" autogyro, are given to show the dimensions of the various forces and moments.
" }, { "name": "Mechling, Wallace Bristol", "degree": "Masters", "year": "1938", "title": "An Evaluation of the Tension Impact Test by Correlation With the Physical Properties of Aluminum Alloys", "advisor": "von K\u00e1rm\u00e1n, Theodore; Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-07192007-104706", "creators": [ { "name": { "family": "Mechling", "given": "Wallace Bristol" }, "id": "Mechling-Wallace-Bristol", "display_name": "Mechling, Wallace Bristol" }, { "name": { "family": "Jack", "given": "Samuel Sloan" }, "id": "Jack-Samuel-Sloan", "display_name": "Jack, Samuel Sloan" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "co-advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/7XWB-QP81", "abstract": "No abstract.\r\n\r\n" }, { "name": "Mellinger, George Rolland", "degree": "Masters", "year": "1938", "title": "Shear Transfer of Load From Main Beams to Intermediate Corrugations in Metal Sheet Covered Box Beams", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-01262006-140318", "creators": [ { "name": { "family": "Mellinger", "given": "George Rolland" }, "id": "Mellinger-George-Rolland", "display_name": "Mellinger, George Rolland" }, { "name": { "family": "Kurihara", "given": "Hisayuki" }, "id": "Kurihara-Hisayuki", "display_name": "Kurihara, Hisayuki" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/5751-Y722", "abstract": "NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.\r\n\r\nA program of experimental investigation for three combinations of sheet reinforced with corrugations has been carried out.
\r\n\r\nAn assumption has been made for the transverse neutral axis of such a system.
\r\n\r\nFor an open section box beam, the conventional assumption of the neutral axis on the center of gravity plane indicates an error.
\r\n\r\nAn attempt has been made to calculate the compressive stress in each corrugation due to shear transfer of load.
\r\n\r\nAn effective shear modulus for each corrugation and its share of the skin under bending loads has been found by experimental methods.
\r\n\r\nFor the combinations tested, it was found that the effective shear modulus, G/E, decreases with increasing \u03c4, which corresponds to increasing G/E with distance from the free end of the panel.
\r\n\r\nPanel curvature was found to have a marked effect on G/E, in that the curved panel had a larger value of G/E for the same \u03c4.
\r\n\r\nContour maps of \u03c4, the shearing stress, have been constructed for the three panels.
" }, { "name": "Morse, Charles Adelbert", "degree": "Masters", "year": "1938", "title": "Concrete Mix Design : A Summary", "advisor": "Converse, Frederick James", "url": "https://resolver.caltech.edu/CaltechTHESIS:11252024-185950309", "creators": [ { "name": { "family": "Morse", "given": "Charles Adelbert" }, "id": "Morse-Charles-Adelbert", "display_name": "Morse, Charles Adelbert" } ], "advisors": [ { "name": { "family": "Converse", "given": "Frederick James" }, "id": "Converse-F-J", "role": "advisor", "display_name": "Converse, Frederick James" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/ab53-yv81", "abstract": "No abstract." }, { "name": "Okun, Daniel Alexander", "degree": "Masters", "year": "1938", "title": "The Aeration of Activated Sludge Mixtures", "advisor": "Thomas, Franklin", "url": "https://resolver.caltech.edu/CaltechTHESIS:07182023-191820603", "creators": [ { "name": { "family": "Okun", "given": "Daniel Alexander" }, "id": "Okun-Daniel-Alexander", "display_name": "Okun, Daniel Alexander" }, { "name": { "family": "Bonell", "given": "John Arthur" }, "id": "Bonell-John-Arthur", "display_name": "Bonell, John Arthur" } ], "advisors": [ { "name": { "family": "Thomas", "given": "Franklin" }, "id": "Thomas-Franklin", "role": "advisor", "display_name": "Thomas, Franklin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/9g8w-eq70", "abstract": "The purpose of this investigation is to establish, to the extent possible, the effect of degree aeration on several characteristics of a sewage-sludge mixture: principally, the oxygen utilization by an activated sludge after varying periods of aeration, with varying amounts of air supplied;\r\nand secondly, the effect of aeration periods of activated sludges on clarification and dissolved oxygen content.
\r\n\r\nThe work was performed at the Tri-City Sewage Treatment Plant, in Alhambra, California (commonly referred to as the Pasadena Sewage Treatment Plant). Tests were run on samples taken from the new aeration and clarification unit used in conjunction with the original activated sludge plant. These tests were made in the laboratory of the plant.
\r\n\r\nTests were begun in January, 1938 and continued until May, 1938, with one interruption, that caused by the floods of early March. The operation of the plant was affected considerably by this flood, and normalcy was not restored until the middle of May. However, the school year necessitated the termination of testing in early May.
\r\n\r\nUnlike most experimental work, the time the tests are performed is in the case of tests run on actual sewage flows extremely important. Early morning flows are small and weak, rising sharply during later morning hours in both quantity of flow and strength of sewage. But due to the exigencies\r\nof scheduled work at the Institute, it was not possible to be at the plant at the requisite hours regularly. \r\nThere were several occasions where we deemed it necessary to run our tests for twelve consecutive hours, but these were seldom possible. \r\nThe effect of the change in flow and strength, together with other time factors are treated later in the paper.
" }, { "name": "Putt, Donald Leander", "degree": "Masters", "year": "1938", "title": "Experimental Investigation of the Thickness of the Boundary Layer and the Location of the Transitional Region Along a Wing Section", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-01092006-152711", "creators": [ { "name": { "family": "Putt", "given": "Donald Leander" }, "id": "Putt-Donald-Leander", "display_name": "Putt, Donald Leander" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "chair", "display_name": "Sechler, Ernest Edwin" }, { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "member", "display_name": "Millikan, Clark Blanchard" }, { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "member", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/ZZVX-7082", "abstract": "A general review of the investigation of the thickness of the boundary layer and the location of the transition point on an airplane wing in free flight that have been published to date is presented, along with some of the conclusions that have been reached from the results of the investigations.
\r\n\r\nThe development and design of apparatus for the experimental determination of the thickness of the boundary layer, and the location of the point of transition from laminar to turbulent flow in the boundary layer which can be readily attached to the surface of a metal airplane wing is described.
\r\n\r\nAlso the method and technique developed for recording the data and the interpretation of the test results are described in detail.
" }, { "name": "Scoles, Albert Buddy", "degree": "Masters", "year": "1938", "title": "Range Calculations for Airplanes With Continuously Controllable Pitch Propellers, and the Effect of Certain Geometric Parameters of the Airplane on Range", "advisor": "Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechETD:etd-02082006-090132", "creators": [ { "name": { "family": "Scoles", "given": "Albert Buddy" }, "id": "Scoles-Albert-Buddy", "display_name": "Scoles, Albert Buddy" }, { "name": { "family": "Schoech", "given": "William Alton" }, "id": "Schoech-William Alton", "display_name": "Schoech, William Alton" } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/CMHQ-E314", "abstract": "This investigation was undertaken to develop a satisfactorily exact method for the calculation of range of airplane; and with such method, to determine the effect of certain geometrical parameters of the airplane on range, namely, span, aspect ratio, and wing loading.
\r\n\r\nWith satisfactory aerodynamic data from wind tunnel reports, and with satisfactory engine performance data from test stand reports, the method developed permits determination of range, optimum speeds to use, and optimum propeller rpm to use for each speed. It further permits determination of endurance.
\r\n\r\nIn general, increasing aspect ratio for constant span will increase maximum range if reasonable upper limits are placed on wing loading. The gain is but slight for aspect ratios in excess of 11. Similarly, decreasing span for constant aspect ratio will increase maximum range. Both of these variations results in increased wing loading, which can therefore be considered as the fundamental factor giving the increase. There will in general be an optimum combination of aspect ratio and span for a given wing loading which will give maximum range. Satisfactory takeoff and sea-level rate of climb will limit the wing loading; however, for wing loadings in excess of 50, the maximum gain obtainable is of the order of 5%.
\r\n" }, { "name": "Smith, Apollo Milton Olin", "degree": "Masters", "year": "1938", "title": "A Preliminary Study of the Problem of Boundary Layer Control", "advisor": "Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechETD:etd-12052007-091749", "creators": [ { "name": { "family": "Smith", "given": "Apollo Milton Olin" }, "id": "Smith-Apollo-Milton-Olin", "display_name": "Smith, Apollo Milton Olin" } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/STNT-3N37", "abstract": "This thesis presents a study of the problem of securing high lifts by means of boundary layer removal, together with first results of tests on the Boundary Layer Model of the Guggenheim Aeronautics Laboratory, California Institute of Technology (hereinafter called GALCIT). It is divided into two parts: first, a review and discussion of previous work, and second, presentation and development of methods used for carrying out tests upon the GALCIT model, together with experimental results obtained from the tests upon the model.
\r\n\r\nPrevious researches show that boundary layer removal is indeed successful in securing high lift coefficients. Study reveals also that results from one experiment may differ greatly from those of another. Consequently, previous work is of little help in predicting results to be obtained for a design different from the model tested.
\r\n\r\nResults on the GALCIT model have not been favorable, but it is believed that flow tests have found the difficulty. Consequently, the experimental work has value only for the light it sheds upon the future course of this research at the Institute.
\r\n\r\n\r\n" }, { "name": "Allardt, Frederick Hamilton", "degree": "Masters", "year": "1937", "title": "The Brinelling of Small Ball Bearings", "advisor": "Klein, Arthur Louis; Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-10132005-103946", "creators": [ { "name": { "family": "Allardt", "given": "Frederick Hamilton" }, "id": "Allardt-Frederick-Hamilton", "display_name": "Allardt, Frederick Hamilton" } ], "advisors": [ { "name": { "family": "Klein", "given": "Arthur Louis" }, "id": "Klein-A-L", "role": "advisor", "display_name": "Klein, Arthur Louis" }, { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/K872-W635", "abstract": "The brinelling of ball bearings is a subject which has had comparatively little study. Since ball bearings have found most of their applications in such things as rotating shafts, there has been little reason to study their action under static loading conditions. This research was suggested by the Fafnir Ball Bearing Company because of the increasing use of ball bearings for static loads in aircraft. In the aircraft business, the designers, because of strict weight requirements, have used ball bearings up to their rated loads. Not infrequently these bearings brinelled. (A brinelled bearing is one in which a dent has been formed in one of the races by a ball). It is therefore evident that more should be known about the brinelling of bearings." }, { "name": "Alwart, Harold John", "degree": "Masters", "year": "1937", "title": "Test Procedure for the Determination of Maximum Moisture Content to be Expected under Footings Located in Permeable Soil Above Water Table.", "advisor": "Converse, Frederick James", "url": "https://resolver.caltech.edu/CaltechTHESIS:03252025-201053142", "creators": [ { "name": { "family": "Alwart", "given": "Harold John" }, "id": "Alwart-Harold-John", "display_name": "Alwart, Harold John" }, { "name": { "family": "Servet", "given": "Abdurrahim" }, "id": "Servet-Abdurrahim", "display_name": "Servet, Abdurrahim" } ], "advisors": [ { "name": { "family": "Converse", "given": "Frederick James" }, "id": "Converse-F-J", "role": "advisor", "display_name": "Converse, Frederick James" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/k6ad-2w08", "abstract": "The problem of determining the bearing value of a soil has long caused considerable trouble among foundation engineers. One of the main features of this problem is the determination of the probable minimum bearing value of a California soil when tested during the summer or dry season. It is a known fact that the bearing value of the soil will vary with the moisture content. It is also quite generally known that the present tests of bearing value do not give true results. By true results are meant, results which accurately check field determinations. There are certain cases in which the saturated tests now in use give value far too low as well as inconsistent values. By means of the tests outlined, the authors believe that more accurate and reliable results may be obtained in the future.
\r\n\r\nThese tests are mainly concerned with the bearing values of soils under shallow footings. Deep footing, cassions and piles are eliminated from the tests. The reason for this being that the authors believe that the more specialized cases should be more thoroughly investigated. However, in the case of the shallow footings, as used for school buildings and homes, a limited amount of investigation and time for testing is required. With this point in mind, work has been concentrated on this point.
\r\n\r\nAs a preliminary step along this line, moisture contents were taken at a number of places before the rainy season began. This was done so that the increase in moisture of a number of definite soils could be obtained and checked in the laboratory. Samples were taken at various depths and places, concentration being in the poorer soils of the district. Later after an unusually heavy rainy season, which it was fortunate to encounter, the sampled places were revisited and the moisture content of the soil again obtained. With this data it was assumed that laboratory checks for these values would hold for any similar soil.
\r\n\r\nThe laboratory work was divided into two main categories. First being the determination of the type of soil in use and its various properties, and the second, the technique and type of test suited for this subject. This first part\r\nconsisted of the standard tests which are hydrometer and sieve analysis, liquid and plastic limits, shear, compression, shrinkage and sp-gravity. The second part was split up into three divisions, per collation, rainfall and\r\ncapillary rise tests. All results were reduced to a common base, but due to the large number of variables, such as compaction, types of soil, density, etc. and the limited time, this could not be carried to the completion desired by the authors.
" }, { "name": "Boothe, Raymond Hudson Ferris", "degree": "Masters", "year": "1937", "title": "A Study of High Velocity Flow Around a Sharp Bend of a Rectangular Open Channel", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:11112024-225842245", "creators": [ { "name": { "family": "Boothe", "given": "Raymond Hudson Ferris" }, "id": "Boothe-Raymond-Hudson-Ferris", "display_name": "Boothe, Raymond Hudson Ferris" }, { "name": { "family": "Wagner", "given": "Warren O." }, "id": "Wagner-Warren-O", "display_name": "Wagner, Warren O." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/qg6j-8k23", "abstract": "No abstract." }, { "name": "Levinton, Harold Leon", "degree": "Masters", "year": "1937", "title": "Hunting and its Cure in a Precision Dynamometer Automatic Torque Mechanism", "advisor": "Knapp, Robert T.", "url": "https://resolver.caltech.edu/CaltechTHESIS:11242024-003442601", "creators": [ { "name": { "family": "Levinton", "given": "Harold Leon" }, "id": "Levinton-Harold-Leon", "display_name": "Levinton, Harold Leon" } ], "advisors": [ { "name": { "family": "Knapp", "given": "Robert T." }, "id": "Knapp-R-T", "role": "advisor", "display_name": "Knapp, Robert T." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/7khn-5a05", "abstract": "This thesis deals with the problem of eliminating hunting in the precision dynamometer torque mechanism of the Hydraulic-Machinery Laboratory of the Metropolitan Water District of Southern California at the California Institute of Technology, and its solution by apparatus built by and from plans proposed by the author.
\r\n\r\nIn addition to solving the particular problem here-in presented, the author, as part of his duties as a member of the laboratory staff, designed and built other apparatus for use in the laboratory. Some of these devices were built purely as experimental apparatus, while others were incorporated as permanent and necessary additions to the laboratory equipment. The following examples will serve as illustrations. The contacts of the automatic precision pressure gauges and venturi manometer required too frequent maintenance due to the delicacy of the instruments and the currents necessary for the contacts to control. A device using eight vacuum tubes solved this problem. It was desired to have a visual check of the laboratory \u201cconstant\u201d frequency against a known standard radio station frequency. By utilizing a cathode ray tuning device such as the popular radio \u201cMagic Eye\u201d, an instrument was designed and constructed which showed deviations in frequency from zero cycles per second upwards.
\r\n\r\nIt is felt by the author that the following pages describing the elimination of dynamometer hunting show the manner in which he attacked and solved those problems presented to him.
" }, { "name": "Losey, Robert M.", "degree": "Masters", "year": "1937", "title": "A Theoretical Investigation of the Possibilities of Internal Cooling of Aircraft Engines by Water Injection to the Cylinder", "advisor": "Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechETD:etd-04112008-132848", "creators": [ { "name": { "family": "Losey", "given": "Robert M." }, "id": "Losey-Robert-M", "display_name": "Losey, Robert M." } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/3PXW-GF19", "abstract": "No abstract." }, { "name": "Miller, Shirley Snow", "degree": "Masters", "year": "1937", "title": "Wind Tunnel Tests on a Low-Wing Monoplane With Propeller Running", "advisor": "Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechTHESIS:11122024-214212298", "creators": [ { "name": { "family": "Miller", "given": "Shirley Snow" }, "id": "Miller-Shirley-Snow", "display_name": "Miller, Shirley Snow" }, { "name": { "family": "Albach", "given": "Walter Henry" }, "id": "Albach-Walter-Henry", "display_name": "Albach, Walter Henry" } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/y5vw-2z26", "abstract": "Various tests have been conducted on airplane wind tunnel models with an operating propeller in an endeavor to furnish the industry data as an aid in design and performance predictions. At the GALCIT, these investigations have comprised the material set forth in references 1, 2 and 4.
\r\n\r\nThe tests conducted by the authors of this paper represent a continuation of the above-mentioned investigations. The purpose of the present tests was to determine l) the effect of power on static longitudinal stability (elevator free); 2)\u00b7the effect of power on hinge moments (at various tab angles); and 3) the effect of power on static directional stability with the model operating at high and low angle of attack.
" }, { "name": "Moore, Charles Kenneth", "degree": "Masters", "year": "1937", "title": "Age Hardening of Heat Treated Aluminum Alloy. An Investigation of the Fluctuation of Hardness with Time of Ageing of Heat Treated Aluminum Alloy Sheet", "advisor": "Sechler, Ernest Edwin; von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-03212005-103521", "creators": [ { "name": { "family": "Moore", "given": "Charles Kenneth" }, "id": "Moore-Charles-Kenneth", "display_name": "Moore, Charles Kenneth" }, { "name": { "family": "Nollan", "given": "John Lloyd" }, "id": "Nollan-John-Lloyd", "display_name": "Nollan, John Lloyd" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" }, { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics", "mecheng" ], "doi": "10.7907/3G1Z-F889", "abstract": "The authors have found what they believe to be a tendency for a certain Aluminum Alloy, namely 24-SO, to fluctuate in strength, and hardness, during the process of age hardening, after heat treatment.
\r\n\r\nThis variation in hardness of the material, while the ageing process is going on, is accompanied by a change in ultimate strength, and in the stress-strain relationship of the material; and in general the condition of the alloy is indicated by the hardness number.
\r\n\r\nThe limited scope of this research does not indicate that this phenomenon of fluctuation of hardening is constant in occurrence; as the number of tests made were insufficient to determine the regularity, or irregularity, of this characteristic of the material.
\r\n\r\nAll of the metal tested became stable within the commonly accepted range of ultimate strength for this alloy.
\r\n\r\nFrom these few experiments it appears that although the hardness varies with time, the alloy, if allowed to age sufficiently, will develop its rated strength.
\r\n\r\nVarious reports have been made to the effect that sheet aluminum alloy, after being heat treated, quenched, and allowed to begin normal age hardening, did not respond to ageing as might be expected, nor did it follow the theoretical hardening curve with reasonable agreement. It was found that sheet material, although apparently properly heat treated, had not hardened, or acquired its full strength, when inspected by hardness testing methods.
\r\n\r\nFrom observations it was found that the same piece, which was observed to be soft, when allowed to age for a longer period and tested again for hardness, had in some cases come up to the required standard, and in others had exceeded the inspection limits.
\r\n\r\nTo the best of the authors knowledge no systematic investigation of this phenomenon has been undertaken, and as a preliminary quest in this field of research a periodic measurement of hardness, and tensile strength, was carried out to determine the actual manner in which the selected material would harden with time, and to correlate its indicated hardness with the strength of the piece at the time of measurement.
" }, { "name": "Smith, Joe Nelson", "degree": "Masters", "year": "1937", "title": "Investigation of Extended Bulb Angle Sections Under Compression: Part One. As Euler Columns ; Part Two. As Stiffeners Attached to Sheet", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-04252008-093950", "creators": [ { "name": { "family": "Smith", "given": "Joe Nelson" }, "id": "Smith-Joe-Nelson", "display_name": "Smith, Joe Nelson" }, { "name": { "family": "Murphy", "given": "Joseph Nathaniel" }, "id": "Murphy-Joseph Nathaniel", "display_name": "Murphy, Joseph Nathaniel" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "None", "given": "None" }, "display_name": "None, None" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/R62Z-6P10", "abstract": "No abstract.\r\n" }, { "name": "Young, Bradley Hobart", "degree": "Masters", "year": "1937", "title": "A Two-Parameter Wind Tunnel Rigging System", "advisor": "Klein, Arthur Louis", "url": "https://resolver.caltech.edu/CaltechETD:etd-03242005-100937", "creators": [ { "name": { "family": "Young", "given": "Bradley Hobart" }, "id": "Young-Bradley-Hobart", "display_name": "Young, Bradley Hobart" } ], "advisors": [ { "name": { "family": "Klein", "given": "Arthur Louis" }, "id": "Klein-A-L", "role": "advisor", "display_name": "Klein, Arthur Louis" } ], "committee": [ { "name": { "family": "Klein", "given": "Arthur Louis" }, "id": "Klein-A-L", "role": "chair", "display_name": "Klein, Arthur Louis" }, { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "member", "display_name": "Millikan, Clark Blanchard" }, { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "member", "display_name": "Sechler, Ernest Edwin" }, { "name": { "family": "Bowen", "given": "William H." }, "id": "Bowen-W-H", "role": "member", "display_name": "Bowen, William H." } ], "option_major": [ "aeronautics" ], "doi": "10.7907/CVB4-7510", "abstract": "In January of 1935, definite steps were taken in a two part program to modernize the ten-foot wind tunnel of the Guggenheim Aeronautical Laboratory at the California Institute of Technology. Part one of the program was the design and construction of a new wind tunnel rigging system based on concepts originally laid down by Dr. A. L. Klein, Associate Professor at the same institution. Part two of the program, to be carried on intensively immediately after completion of part one, will be the development of an entirely new force measuring system to replace the present modified steelyard type balances.
\r\n\r\nIn this paper the general problem of wind tunnel testing and equipment will be briefly outlined with the bulk of the discussion then given over to the problems concerning the evolution and design of a specific wind tunnel rigging system. As the system is not yet complete in its final form obviously there can be no description of the project as a finished piece of work. Also, it has been thought inadvisable to present only the system as it exists at present, therefore all the various features or principles that have been considered will be discussed and reason for their discard or adoption made clear. The result should then be a guide or at least an aid to the completion of part one of the modernizing program
\r\n\r\nIn a latter section of the paper some of the desired features of the contemplated force measuring system will be set down in the hope that they may be a skeletal set of requirements for the second part of the modernizing program.
\r\n" }, { "name": "Bolster, Calvin Mathews", "degree": "Masters", "year": "1936", "title": "Wind Tunnel Tests on the Effect of Power on the Stability of a Low Wing Monoplane with Three Vertical Positions of Horizontal Tail Surfaces", "advisor": "Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechETD:etd-01102006-161025", "creators": [ { "name": { "family": "Bolster", "given": "Calvin Mathews" }, "id": "Bolster-Calvin-Mathews", "display_name": "Bolster, Calvin Mathews" } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/QRHQ-FP49", "abstract": "A great majority of present day airplanes are of the low wing cantilever type. An investigation into the effect of power and vertical location of the horizontal tail surfaces on the longitudinal static stability of such airplanes is therefore of interest.
\r\n\r\nThe present investigation was carried out on a one-sixth scale model of a low wing single engine tractor monoplane. The results are probably most directly applicable to airplanes of this type. However, the tendencies and general effects should also be fairly indicative of what may be expected in multiple engine low wing monoplanes of conventional design.
" }, { "name": "Childers, Milford Carlson", "degree": "Masters", "year": "1936", "title": "Stresses in Metal Beams with Flat Sheet Webs of Medium Thickness", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-04242008-111115", "creators": [ { "name": { "family": "Childers", "given": "Milford Carlson" }, "id": "Childers-Milford-Carlson", "display_name": "Childers, Milford Carlson" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "chair", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Klein", "given": "Arthur Louis" }, "id": "Klein-A-L", "role": "member", "display_name": "Klein, Arthur Louis" }, { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "member", "display_name": "Millikan, Clark Blanchard" }, { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "member", "display_name": "Sechler, Ernest Edwin" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/Y3QT-J764", "abstract": "This paper develops a method by which the stresses in the component parts of a solid web beam may be computed when the dimensions of the web thickness, beam height, and distance between stiffeners are such that the web does not go into the wave state immediately upon applying a small load. The stress in the web itself is calculated by a consideration of the buckling load of the web. The load in the stiffeners and flanges is computed by assuming an effective width of sheet as acting with them. This effective width is obtained by a consideration of the buckling properties of thin sheet in shear.
\r\n\r\nThe results are in the same form as the familiar Wagner beam equations except that certain terms must be modified and corrections made. The results herein obtained are not to be considered as superseding the Wagner Equations as derived in Ref. I, but supplement them to take care of cases out of the range of the Wagner assumptions.
\r\n" }, { "name": "Colman, Philip Abbey", "degree": "Masters", "year": "1936", "title": "The Oscillating Vane-Type Fan", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-07172007-145903", "creators": [ { "name": { "family": "Colman", "given": "Philip Abbey" }, "id": "Colman-Philip-Abbey", "display_name": "Colman, Philip Abbey" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/0TZ7-7Q11", "abstract": "The investigation herein described was undertaken to determine the performance characteristics of the oscillating vane-type fan. The fan was the invention of Mr. Van Dorn and Mr. Cornwell, primarily for use in circulating air in railroad refrigerator cars. In the present system of railroad refrigeration for the transportation of perishable foodstuffs, the refrigerator car is a heat insulated car, with bunkers at each end for the cakes of ice. When the car is loaded and the doors shut, cooling is obtained only due to the natural circulation of air in the car, caused by the difference in temperature between the ice in the bunker and the fruit. This circulation has not been found sufficient, in that there is a large temperature difference between the top and bottom fruit (see Appendix B) and the top half is too warm, often spoiling during transportation. Also, because of this, the car cannot be filled to its volumetric capacity. Therefore the requirements which led to the invention of this type of fan were as follows:
\r\n\r\n1. To provide a sufficient volume of air, against the resistance developed in passing through the fruit, to obtain the cooling characteristics required.
\r\n\r\n2. To provide a fan which would not require major changes in the structural design of the car, or lessen the amount of fruit which could be carried.
\r\n\r\n3. To provide a fan, simple in construction and installation, and in its drive mechanism from the car axle.
The oscillating vane-type fan met conditions 2 and 3 in that it could be situated in the four and one half inch space between the floor racks and the floor of the car, through which the air naturally circulated, and in that it could be driven by a simple wheel and crank drive directly off the axle. This thesis presents the results of the investigation of the first condition.
\r\n" }, { "name": "Fleming, Morton Klyne", "degree": "Masters", "year": "1936", "title": "Experimental Investigation of the Effect Of Power Upon the Static Longitudinal Stability of a Low Winged Monoplane and a Method for its Calculation", "advisor": "Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechETD:etd-04152008-085638", "creators": [ { "name": { "family": "Fleming", "given": "Morton Klyne" }, "id": "Fleming-Morton-Klyne", "display_name": "Fleming, Morton Klyne" } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/JKVP-P690", "abstract": "To obtain the change in the longitudinal moment of a low winged monoplane caused by the addition of the propulsive unit operating at various conditions of power.
\r\n\r\nTo construct possible working charts for use in calculating this change from power off wind tunnel tests of scale models.
\r\n" }, { "name": "Fox, James May", "degree": "Masters", "year": "1936", "title": "Flood Frequencies on the San Gabriel River", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:10092024-213837010", "creators": [ { "name": { "family": "Fox", "given": "James May" }, "id": "Fox-James-May", "display_name": "Fox, James May" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/gacm-2y50", "abstract": "No abstract." }, { "name": "Griffiths, Thomas William", "degree": "Masters", "year": "1936", "title": "Flow Characteristics of the Santa Ana River", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:10102024-162658089", "creators": [ { "name": { "family": "Griffiths", "given": "Thomas William" }, "id": "Griffiths-Thomas-William", "display_name": "Griffiths, Thomas William" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/8sfb-dj41", "abstract": "No abstract." }, { "name": "Howland, Walter Lavern", "degree": "Masters", "year": "1936", "title": "Effect of Rivet Spacing on Stiffened Thin Sheet Under Compression", "advisor": "von K\u00e1rm\u00e1n, Theodore; Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-07182007-093403", "creators": [ { "name": { "family": "Howland", "given": "Walter Lavern" }, "id": "Howland-Walter-Lavern", "display_name": "Howland, Walter Lavern" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/KCDP-9732", "abstract": "This thesis discusses an experimental investigation of the stress distribution across a stiffened thin sheet panel under compression. The effect of bending stresses and curvature of the sheet on extensometer readings is also dealt with. An attempt is made to determine a rational design criteria for rivet spacing on stiffened thin sheet under compression. Design curves of rivet spacing against thickness are developed. The effect of changing the rivet spacing or size on the ultimate load of a compression panel is discussed in view of some experiments." }, { "name": "Jennison, James Henry", "degree": "Masters", "year": "1936", "title": "Dynamic Studies of the Displacements of Buildings Frames Due to Vibrations", "advisor": "Martel, Romeo Raoul", "url": "https://resolver.caltech.edu/CaltechTHESIS:07282025-150624673", "creators": [ { "name": { "family": "Jennison", "given": "James Henry" }, "id": "Jennison-James-Henry", "display_name": "Jennison, James Henry" } ], "advisors": [ { "name": { "family": "Martel", "given": "Romeo Raoul" }, "id": "Martel-R-R", "role": "advisor", "display_name": "Martel, Romeo Raoul" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/ed6a-3886", "abstract": "No abstract." }, { "name": "Lovett, Benjamin Barnes Compton", "degree": "Masters", "year": "1936", "title": "Transfer of Stress from Main Beams to Intermediate Stiffeners in Metal Sheet Covered Box Beams", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-01272006-091759", "creators": [ { "name": { "family": "Lovett", "given": "Benjamin Barnes Compton" }, "id": "Lovett-Benjamin-Barnes-Compton", "display_name": "Lovett, Benjamin Barnes Compton" }, { "name": { "family": "Rodee", "given": "Walter Fred" }, "id": "Rodee-Walter-Fred", "display_name": "Rodee, Walter Fred" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/MAAF-MM48", "abstract": "The authors have obtained by experimental methods an effective sheer modulus for the sheet in a stiffened plane sheet beam combination under bending loads. For the combinations tested it was found that the modulus decreases rapidly under light loadings from the elastic value to some asymptotic value depending upon the sheet thickness. The thick sheet combination gave higher values of the effective shear modulus than the thin sheet." }, { "name": "Malina, Frank Joseph", "degree": "Masters", "year": "1936", "title": "Characteristics of Braked, Locked and Free-Wheeling Two- and Three-Bladed Propellers", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-02092007-153045", "creators": [ { "name": { "family": "Malina", "given": "Frank Joseph" }, "id": "Malina-Frank-Joseph", "display_name": "Malina, Frank Joseph" }, { "name": { "family": "Jenney", "given": "William W." }, "id": "Jenney-William-W", "display_name": "Jenney, William W." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/HYXB-6T51", "abstract": "The use of multi-engined aircraft has introduced the problem of aircraft performance when one or more power units have either become unusable or voluntarily shut down during cruising flight. If the use of the engine is to be discontinued because of mechanical failure, the desirable procedure is obviously to stop it altogether, so as to prevent possible destruction to the engine. This can be accomplished by locking the propeller, by a free-wheeling arrangement, or by feathering a variable pitch propeller. If the use of the engine is to be discontinued merely to reduce fuel consumption, the propeller may be allowed to turn the engine, in which case the propeller is braked by a torque equal to the friction of the engine.
\r\n\r\nAnother recent development connected with braked propellers is the fact that the variable pitch propeller now offers the possibility of using the large increment in drag at low blade angles of braked and free-wheeling propellers for reduction in landing speed or landing run of clean, highly powered, multi-engined aircraft.
\r\n\r\nIt was the purpose of the present investigation to provide information not already made available by researches listed under the references at the end of this paper. Therefore the following thesis will be concerned chiefly with the three-bladed propeller and its effect on airplane characteristics, the two-bladed propeller being used principally for comparison purposes with other available data. The tests were performed at model scale, but their acceptance as applicable to full scale is supported by the favorable comparisons made in Reference 5.
\r\n\r\n" }, { "name": "Martin, Victor John", "degree": "Masters", "year": "1936", "title": "Airplane Takeoff Performance", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-03142005-145716", "creators": [ { "name": { "family": "Martin", "given": "Victor John" }, "id": "Martin-Victor-John", "display_name": "Martin, Victor John" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/JQD0-EW36", "abstract": "In this paper a general equation for calculating the takeoff performance of landplanes is developed in terms of the usual airplane parameters.
\r\n\r\nThe analysis enables the ground effect, wind and atmospheric conditions, altitude, and the use of flaps to be taken into account. A simple and rapid method is presented for the determination of the best flap angle to be used for takeoff.
\r\n\r\nVariation in takeoff performance due to changes in any of the airplane or engine-propeller characteristics is readily determined through the introduction of a new takeoff acceleration parameter.
\r\n\r\nA method for calculating the propeller speed, engine power, and thrust variation for both fixed-pitch and constant-speed propellers is included, and a new significance is given to the thrust versus square of velocity curve for takeoff computations.
\r\n\r\nExamples are included to illustrate the use of the analysis in solving the various takeoff problems.
\r\n" }, { "name": "McKillip, John C. Siemer", "degree": "Masters", "year": "1936", "title": "The Causes and Forecasting of the Fog and Stratus Clouds of the California Coastal Regions and the Temperature Inversions Associated with Them", "advisor": "Krick, Irving Parkhurst", "url": "https://resolver.caltech.edu/CaltechTHESIS:11072024-210419082", "creators": [ { "name": { "family": "McKillip", "given": "John C. Siemer" }, "id": "McKillip-John-C-Siemer", "display_name": "McKillip, John C. Siemer" }, { "name": { "family": "Oberholtzer", "given": "William Edward" }, "id": "Oberholtzer-William-Edward", "display_name": "Oberholtzer, William Edward" } ], "advisors": [ { "name": { "family": "Krick", "given": "Irving Parkhurst" }, "id": "Krick-I-P", "role": "advisor", "display_name": "Krick, Irving Parkhurst" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/mhck-3a74", "abstract": "No abstract." }, { "name": "Whelan, Thomas Murray", "degree": "Masters", "year": "1936", "title": "The Calculated Flight Path of the U.S.S. Macon", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-12222005-112942", "creators": [ { "name": { "family": "Whelan", "given": "Thomas Murray" }, "id": "Whelan-Thomas-Murray", "display_name": "Whelan, Thomas Murray" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/PC07-4F03", "abstract": "These calculations are concerned with the flight path of the Macon after the loss of the upper fin and the deflation of the three after gas cells. Taking into account the actual flight conditions, the question was raised whether the ship would rise to an altitude of 4800 feet. For at this altitude, which the record shows was actually reached, the ship had exceeded pressure height by about 2000'. In going over pressure height, the ship loses approximately 3% of her lift for every 1000 feet. Hence 4800 feet corresponds to a heaviness of nearly 11 tons. It was felt that if this additional heaviness could have been avoided, the ship might have been flown safely in spite of the loss of some 20 tons of lift from the three after cells. The calculations were undertaken to determine whether the aerodynamic and aerostatic forces alone were sufficient to force the ship up to 4800 feet or whether there were external forces acting, i. e. gust forces." }, { "name": "Zimmerman, Don Zabriskie", "degree": "Masters", "year": "1936", "title": "Part I. Determination of Wind Direction from Cloud Forms. Part II. Notes on Weather in the Los Angeles Basin with Special Reference to Topographic Effects", "advisor": "Krick, Irving Parkhurst", "url": "https://resolver.caltech.edu/CaltechTHESIS:07102025-155542450", "creators": [ { "name": { "family": "Zimmerman", "given": "Don Zabriskie" }, "id": "Zimmerman-Don-Zabriskie", "display_name": "Zimmerman, Don Zabriskie" } ], "advisors": [ { "name": { "family": "Krick", "given": "Irving Parkhurst" }, "id": "Krick-I-P", "role": "advisor", "display_name": "Krick, Irving Parkhurst" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/tsr8-jz20", "abstract": "No abstract." }, { "name": "Chan, Glenn Chew", "degree": "Masters", "year": "1935", "title": "Economical Design of Building Frames", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:10092024-171559234", "creators": [ { "name": { "family": "Chan", "given": "Glenn Chew" }, "id": "Chan-Glenn-Chew", "display_name": "Chan, Glenn Chew" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/d779-h927", "abstract": "No abstract." }, { "name": "Howard, Ernest Russell", "degree": "Masters", "year": "1935", "title": "Residual Stresses in Bimetallic Strips", "advisor": "Converse, Frederick James", "url": "https://resolver.caltech.edu/CaltechTHESIS:12072024-122445532", "creators": [ { "name": { "family": "Howard", "given": "Ernest Russell" }, "id": "Howard-Ernest-Russell", "display_name": "Howard, Ernest Russell" } ], "advisors": [ { "name": { "family": "Converse", "given": "Frederick James" }, "id": "Converse-F-J", "display_name": "Converse, Frederick James" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "mecheng" ], "doi": "10.7907/4n8a-nr57", "abstract": "It is concluded (1) that under the assumption mentioned on\r\npage 56 the residual initial stress at room temperature in the\r\nouter fiber of the invar side of the bimetallic strip ranges from\r\n35,000 lb. per sq. in. tension to zero stress depending on the\r\nrolling hardness of the strip. The residual stress distribution\r\nover the entire cross section, was not determined. (2) With subjection\r\nof the bimetallic strip to a temperature of 600\u00b0 F. for\r\n504 hours the residual stress in the invar outer fiber is in general\r\nreduced. (3) When the bimetallic strip is considered as a\r\nhomogeneous material, the proportional elastic limit in bending\r\nranges from 39,000 to 126,000 pounds per square inch in the outer\r\nfiber if the strip is bent so as to put the steel side in tension,\r\nand ranges from 28,000 to 70,000 pounds _per square inch in the\r\nouter fiber if the strip is bent so as to put the invar in tension.\r\nThe proportional elastic limit varies with the rolling hardness of\r\nthe strip." }, { "name": "Kartzke, Paul Louis", "degree": "Masters", "year": "1935", "title": "A Comparison and Experimental Test of the Types of Analysis of the Motions of Buildings Effected by Transient Oscillations", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:10072024-173129922", "creators": [ { "name": { "family": "Kartzke", "given": "Paul Louis" }, "id": "Kartzke-Paul-Louis", "display_name": "Kartzke, Paul Louis" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/fjg5-vk82", "abstract": "No abstract." }, { "name": "Kitsuda, Kaname", "degree": "Masters", "year": "1935", "title": "Investigation of Stress Distribution on Thin Metal Sheet With Holes", "advisor": "Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-03112005-134957", "creators": [ { "name": { "family": "Kitsuda", "given": "Kaname" }, "id": "Kitsuda-Kaname", "display_name": "Kitsuda, Kaname" } ], "advisors": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/921K-MD80", "abstract": "This paper presents the investigation of the ultimate strength of a plate under shearing stresses when the plate contains lightening holes. The optimum arrangement of holes and the most desirable size of hole has also been investigated. Stress-strain curves have been made which show the points at which the plates reach the buckling point, the elastic limit, and the point of permanent deformation.\r\n" }, { "name": "McCann, Gilbert Donald", "degree": "Masters", "year": "1935", "title": "Construction and Operation of a Million Volt Surge Generator", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:10282024-210247502", "creators": [ { "name": { "family": "McCann", "given": "Gilbert Donald" }, "id": "McCann-Gilbert-Donald", "display_name": "McCann, Gilbert Donald" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/xc96-gk14", "abstract": "No abstract." }, { "name": "McNeal, Don", "degree": "Masters", "year": "1935", "title": "Ice Formation in the Atmosphere", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-04222008-104429", "creators": [ { "name": { "family": "McNeal", "given": "Don" }, "id": "McNeal-Don", "display_name": "McNeal, Don" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "meteor" ], "doi": "10.7907/SX19-PN27", "abstract": "No abstract.\r\n" }, { "name": "Parr, Warren Sherman", "degree": "Masters", "year": "1935", "title": "Investigation of Duralumin Channel Section Strut Under Compression", "advisor": "von K\u00e1rm\u00e1n, Theodore; Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-12222005-115855", "creators": [ { "name": { "family": "Parr", "given": "Warren Sherman" }, "id": "Parr-Warren-Sherman", "display_name": "Parr, Warren Sherman" }, { "name": { "family": "Beakley", "given": "Wallace Morris" }, "id": "Beakley-Wallace-Morris", "display_name": "Beakley, Wallace Morris" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/9VQN-K047", "abstract": "This investigation has clearly established the fact that, for sections built up of straight line elements, theoretical calculations can be made with a degree of accuracy sufficient for practical application and will be on the conservative side." }, { "name": "Russell, James Sargent", "degree": "Masters", "year": "1935", "title": "Propeller Characteristics and Slipstream Effects on a High Wing Monoplane from Wind Tunnel Tests", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:08182010-095214810", "creators": [ { "name": { "family": "Russell", "given": "James Sargent" }, "id": "Russell-James-Sargent", "display_name": "Russell, James Sargent" }, { "name": { "family": "McCoy", "given": "Howard Monroe" }, "id": "McCoy-Howard-Monroe", "display_name": "McCoy, Howard Monroe" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/91VQ-DG62", "abstract": "No abstract." }, { "name": "White, Roland James", "degree": "Masters", "year": "1935", "title": "The Stress Distribution in Reinforced Plates Under Concentrated Edge Loads", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-12282005-152042", "creators": [ { "name": { "family": "White", "given": "Roland James" }, "id": "White-Roland-James", "display_name": "White, Roland James" }, { "name": { "family": "Antz", "given": "Hans Martin" }, "id": "Antz-Hans-Martin", "display_name": "Antz, Hans Martin" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/1Q4M-AS93", "abstract": "As part of the investigation of the stress distribution in metal covered wings leading to the most efficient distribution of materials, experiments have been made with flat plates reinforced with stiffeners under concentrated edge loads. Two theoretical solutions have been proposed: one by means of differential equations, considering the sheet between the stiffeners as the medium of transfer and the amount of load transferred to be proportional to the differences in the deflections; the other method, using the principle of the minimum of energy, approximates the accurate solution by considering the loaded system to be composed of columns (stiffeners acting with an effective width of sheet) under compression, the sheet being under shear." }, { "name": "Wood, Carlos Claude", "degree": "Masters", "year": "1935", "title": "Axial Flow Fan Design by Lattice Theory", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-10282005-132754", "creators": [ { "name": { "family": "Wood", "given": "Carlos Claude" }, "id": "Wood-Carlos-Claude", "display_name": "Wood, Carlos Claude" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/6H0T-G579", "abstract": "This thesis takes the much discussed and comparatively little used lattice theory and applies it to the design of fans. The application is made through the use of charts coming out of the theory. It is felt that by the use of the charts that the design of confined fans, that is those where end effects on the blades need not be considered, will be made considerably simpler and easier.
\r\n\r\nThe use of the lattice theory in the design of fairly complicated vane systems is discussed, and an approximate method of analysis is given. This subject requires more study in the near future.
\r\n\r\nAs yet, at the time of writing, the method has not been checked by experiment, and as a result not much may be said concerning the accuracy of the results as actually applied to design. However, the use of the lattice theory gives designs that appear to be reasonable, and it is hoped that the method will prove to be fairly accurate in actual practice. At present a fan and vane installation as shown in Fig. XIII and Fix. XV is being constructed, and it is hoped that it will be possible to present some experimental data on the design in the near future.
" }, { "name": "Bridget, Francis Joseph", "degree": "Masters", "year": "1934", "title": "Buckling of Thin Walled Cylinders under Compression of Tension and Torsion", "advisor": "Donnell, Lloyd Hamilton", "url": "https://resolver.caltech.edu/CaltechTHESIS:09182024-203332146", "creators": [ { "name": { "family": "Bridget", "given": "Francis Joseph" }, "id": "Bridget-Francis-Joseph", "display_name": "Bridget, Francis Joseph" } ], "advisors": [ { "name": { "family": "Donnell", "given": "Lloyd Hamilton" }, "id": "Donnell-Lloyd-Hamilton", "role": "advisor", "display_name": "Donnell, Lloyd Hamilton" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/3nqj-9h59", "abstract": "No abstract." }, { "name": "Byrne, Ralph Edward", "degree": "Masters", "year": "1934", "title": "A Modification of the Moment Distribution Method to Take Into Account the Depth of Members", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-06182007-160253", "creators": [ { "name": { "family": "Byrne", "given": "Ralph Edward" }, "id": "Byrne-Ralph-Edward", "display_name": "Byrne, Ralph Edward" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/R6FJ-YC59", "abstract": "No abstract.\r\n\r\n" }, { "name": "Christensen, Nephi Albert", "degree": "Masters", "year": "1934", "title": "The Effect of Openings on the Lateral Stiffness of Walls Between Continuous, Rigid Floor", "advisor": "Martel, Romeo Raoul", "url": "https://resolver.caltech.edu/CaltechTHESIS:10072024-224020004", "creators": [ { "name": { "family": "Christensen", "given": "Nephi Albert" }, "id": "Christensen-Nephi-Albert", "display_name": "Christensen, Nephi Albert" } ], "advisors": [ { "name": { "family": "Martel", "given": "Romeo Raoul" }, "id": "Martel-R-R", "role": "advisor", "display_name": "Martel, Romeo Raoul" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/bn1m-4p30", "abstract": "No abstract." }, { "name": "Descamps, Alphonse Maurice", "degree": "Masters", "year": "1934", "title": "Photographic Study of Vortex Motions", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-04142008-151832", "creators": [ { "name": { "family": "Descamps", "given": "Alphonse Maurice" }, "id": "Descamps-Alphonse-Maurice", "display_name": "Descamps, Alphonse Maurice" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/6QH1-R015", "abstract": "No abstract.\r\n" }, { "name": "Goldstein, Julian Richard", "degree": "Masters", "year": "1934", "title": "Investigation of Turbulence in Circular Tubes by Means of a Hot-Wire Anemometer", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-04152008-111221", "creators": [ { "name": { "family": "Goldstein", "given": "Julian Richard" }, "id": "Goldstein-Julian-Richard", "display_name": "Goldstein, Julian Richard" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/A5KY-WY52", "abstract": "It is the purpose of this paper to present the results of some investigation of turbulent flow in straight circular tubes, conducted at the suggestion of Dr. Th. Von Karman, and to give a detailed description of the method of using the hot-wire anemometer to measure fluctuations of the air velocity in a direction parallel to the mean flow." }, { "name": "Housner, George William", "degree": "Masters", "year": "1934", "title": "An Investigation of the Effect of Bearing Area and Depth upon the Settlements of Footings", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09182024-211238173", "creators": [ { "name": { "family": "Housner", "given": "George William" }, "id": "Housner-George-William", "display_name": "Housner, George William" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/2bkd-2s20", "abstract": "No abstract." }, { "name": "Johnson, Samuel Yorks", "degree": "Masters", "year": "1934", "title": "Experimental Determination of Pressure Distribution Under a Combined Footing", "advisor": "Converse, Frederick James", "url": "https://resolver.caltech.edu/CaltechTHESIS:09272024-182827005", "creators": [ { "name": { "family": "Johnson", "given": "Samuel Yorks" }, "id": "Johnson-Samuel-Yorks", "display_name": "Johnson, Samuel Yorks" }, { "name": { "family": "Scott", "given": "Homer Judkins" }, "id": "Scott-Homer-Judkins", "display_name": "Scott, Homer Judkins" } ], "advisors": [ { "name": { "family": "Converse", "given": "Frederick James" }, "id": "Converse-F-J", "role": "advisor", "display_name": "Converse, Frederick James" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/37jm-wc42", "abstract": "No abstract." }, { "name": "Magden, John Leslie", "degree": "Masters", "year": "1934", "title": "A Preliminary Investigation of Rivets and Riveted Joints in Metal Airplane Construction", "advisor": "Klein, Arthur Louis; Sechler, Ernest Edwin", "url": "https://resolver.caltech.edu/CaltechETD:etd-07172007-081411", "creators": [ { "name": { "family": "Magden", "given": "John Leslie" }, "id": "Magden-John-Leslie", "display_name": "Magden, John Leslie" } ], "advisors": [ { "name": { "family": "Klein", "given": "Arthur Louis" }, "id": "Klein-A-L", "role": "advisor", "display_name": "Klein, Arthur Louis" }, { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-E-E", "role": "advisor", "display_name": "Sechler, Ernest Edwin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/MWT3-P557", "abstract": "No abstract." }, { "name": "Rassieur, William Theodore", "degree": "Masters", "year": "1934", "title": "Hinge Moments", "advisor": "von K\u00e1rm\u00e1n, Theodore; Klein, Arthur Louis", "url": "https://resolver.caltech.edu/CaltechETD:etd-04152008-090606", "creators": [ { "name": { "family": "Rassieur", "given": "William Theodore" }, "id": "Rassieur-William-Theodore", "display_name": "Rassieur, William Theodore" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Klein", "given": "Arthur Louis" }, "id": "Klein-A-L", "role": "advisor", "display_name": "Klein, Arthur Louis" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/5P3S-7022", "abstract": "The matter herein presented represents the results of an investigation on hinge moments of ailerons on a 1/12.5 scale model of a main wing airfoil of the XP3D-l Navy Patrol Boat.
\r\n\r\nThe data obtained were then employed in the calculation of stick forces due to aileron moments on the full scale airplane, the calculations covering a flying range of eighty to one hundred eighty miles per hour.
\r\n" }, { "name": "Rockefeller, William Curtis", "degree": "Masters", "year": "1934", "title": "A Study of the Selection of Flight Paths in Air Transport Operations", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:10242017-090415553", "creators": [ { "name": { "family": "Rockefeller", "given": "William Curtis" }, "id": "Rockefeller-William-Curtis", "display_name": "Rockefeller, William Curtis" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/2ZSP-A355", "abstract": "1. GENERAL:
\r\n\r\nWith the introduction of the modern high perfor\u00admance airplane \r\ninto the air transportation systems of the country it has become \r\nincreasingly necessary to make some study of the variables which \r\ninfluence the proper selection of flight paths for the efficient \r\noperation of the aircraft.
\r\n\r\nIn the past it has been the practice in the air transport \r\nindustry to make a very rough estimate of the ef\u00adfect of the winds \r\nand thus determine the best altitude at which to fly on the course.\t\r\nThere has been a complete neg\u00adlect of the possibilities which \r\nare presented by a considera\u00adtion of the airplane performance.
\r\n\r\nIt is the purpose of this thesis to analize the effects of all\r\nof these variables with a view to obtaining some practical\r\nknowledge which may be valuable to the air transportation industry.
\r\n\r\n2. STATEMENT OF THE PROBLEM:
\r\n\r\nThe problem in general is the following: To provide a means of \r\nquickly determining before the start of a flight the path which the \r\npilot should follow in order to fly between any two points in the \r\nminimum possible time. Thus for a given set of cruising specifications \r\nfor the air\u00adplane, this path becomes the optimum, not only for time \r\nelapsed, but also for economy of operation. The method must take into \r\naccount both aerodynamic and meteorological varia\u00adtions.
\r\n\r\nTo be of practical use in air transport operation the method\r\nprovided must have three definite qualifications.
\r\n\r\n1. It must be such as to be readily calculated for a given\r\nflight by a person completely unfamiliar with aerodynamics and\r\nairplane performance.
\r\n\r\n2. It must not require more than a few minutes to calculate for\r\na given flight.
\r\n\r\n3. It must be such that the data can be presented to the pilot\r\nin a brief and useful form.
\r\n\r\nIn addition to the above it is highly desirable to provide information \r\nwhich will be of use to the pilot in properly navigating the airplane \r\nalong the course.
\r\n\r\nAll of the above requirements have been carefully considered throughout \r\nthe analysis and the attempt has been made to incorporate them into \r\nthe resulting method to as great an extent as possible.
\r\n" }, { "name": "Root, Leonard Eugene", "degree": "Masters", "year": "1934", "title": "A Study of the Dynamic Longitudinal Stability of Airplanes with Special Application to Design", "advisor": "Millikan, Clark Blanchard; von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechTHESIS:09302024-220529723", "creators": [ { "name": { "family": "Root", "given": "Leonard Eugene" }, "id": "Root-Leonard-Eugene", "display_name": "Root, Leonard Eugene" } ], "advisors": [ { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" }, { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/an7m-3j68", "abstract": "No abstract." }, { "name": "Vosseller, Aurelius Bartlett", "degree": "Masters", "year": "1934", "title": "Investigation of Relation Between Euler and Flat Plate Buckling of \"L\" Section Struts", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechETD:etd-04242008-084758", "creators": [ { "name": { "family": "Vosseller", "given": "Aurelius Bartlett" }, "id": "Vosseller-Aurelius-Bartlett", "display_name": "Vosseller, Aurelius Bartlett" }, { "name": { "family": "Jerome", "given": "Clayton Charles" }, "id": "Jerome-Clayton-Charles", "display_name": "Jerome, Clayton Charles" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/6HFP-5R14", "abstract": "No abstract.\r\n\r\n" }, { "name": "Applegate, Lindsay Moritz", "degree": "Masters", "year": "1933", "title": "Current Balance and Voltage Compensated Protection Systems", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09162024-173342826", "creators": [ { "name": { "family": "Applegate", "given": "Lindsay Moritz" }, "id": "Applegate-Lindsay-Moritz", "display_name": "Applegate, Lindsay Moritz" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/d7a9-9d72", "abstract": "No abstract." }, { "name": "Atwood, Albert William, Jr.", "degree": "Masters", "year": "1933", "title": "A Free Quartz Pendulum: Electrostatically Driven and Photoelectrically Controlled as a Means of Precision Timekeeping", "advisor": "Mackeown, Samuel Stuart", "url": "https://resolver.caltech.edu/CaltechTHESIS:10272024-015633448", "creators": [ { "name": { "family": "Atwood", "given": "Albert William, Jr." }, "id": "Atwood-Albert-William-Jr", "display_name": "Atwood, Albert William, Jr." } ], "advisors": [ { "name": { "family": "Mackeown", "given": "Samuel Stuart" }, "id": "Mackeown-S-S", "role": "advisor", "display_name": "Mackeown, Samuel Stuart" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/c5s0-qx08", "abstract": "After making a careful study of the field of timekeeping the pendulum was found to be the best timekeeper. A lengthy investigation was made of all the factors that affect the period of a pendulum, and these are outlined in the report. Choosing a free pendulum in preference to the compensated compound pendulum, the period of one half second was taken, and the physical dimensions of a pendulum worked out. It was decided to make the pendulum entirely of quartz, and to operate it in a vacuum. An original electrostatic drive was adopted as the means of keeping the pendulum in motion. This drive required the design of a special circuit which has been worked out, and the constants of this circuit calculated with an assumed damping factor.
\r\n\r\nConstruction was started, but much difficulty was encountered, especially in the making and fastening of a fine quartz spring to the rod. A strong mounting and the driving condenser have also been built. A good bibliography has been worked up for t he aid of the person who carries on this work.
" }, { "name": "Bowman, Frederic Berkeley", "degree": "Masters", "year": "1933", "title": "Investigation and Discussion of Phenomena Affecting the Settling Characteristics of \"Activated Sludge\" in Light of Current Theory", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09272024-220237691", "creators": [ { "name": { "family": "Bowman", "given": "Frederic Berkeley" }, "id": "Bowman-Frederic-Berkeley", "display_name": "Bowman, Frederic Berkeley" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/j88a-ax58", "abstract": "No abstract." }, { "name": "Cawley, Clifford Comer", "degree": "Masters", "year": "1933", "title": "Experimental Verification of Dr. Biot's Method of Prediction of Earthquake Stresses in a Building", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09242024-163130625", "creators": [ { "name": { "family": "Cawley", "given": "Clifford Comer" }, "id": "Cawley-Clifford-Comer", "display_name": "Cawley, Clifford Comer" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/vb95-d527", "abstract": "No abstract." }, { "name": "Evans, William Morris", "degree": "Masters", "year": "1933", "title": "A Study of Relaying for the Primary Transmission System of the Municipal Light and Power Development, City of Pasadena", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09262024-175529369", "creators": [ { "name": { "family": "Evans", "given": "William Morris" }, "id": "Evans-William-Morris", "display_name": "Evans, William Morris" }, { "name": { "family": "Newmeyer", "given": "William Lawrence" }, "id": "Newmeyer-William-Lawrence", "display_name": "Newmeyer, William Lawrence" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/3rqc-dw75", "abstract": "No abstract." }, { "name": "Hawley, Paul Frederick", "degree": "Masters", "year": "1933", "title": "Determination of the Mutual Inductance of End Turns of Induction Motors", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:01302017-160837563", "creators": [ { "name": { "family": "Hawley", "given": "Paul Frederick" }, "id": "Hawley-Paul-Frederick", "display_name": "Hawley, Paul Frederick" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/KCRV-9C92", "abstract": "The object in making the following investigation\r\nwas to facilitate the obtaining of a more accurate\r\ndetermination of the reactance of the end turns of\r\nrotating alternating current machinery. Such formulae\r\nas are available at present are, as far as the author\r\nknows, based on incorrect assumptions, or fail to\r\nconsider the various factors present. The accuracy of\r\nthe results obtained when using such formulae is very\r\nsmall. Often the calculated reactance will not be\r\nwithin 400% of the correct value. Because of this, it\r\nwas felt that a more accurate analysis of this problem\r\nwould be of value, chiefly to the designing engineer.
\r\n\r\nIn this report, the \"end turns\" of the machine\r\nwindings are considered to be the part of the turns of\r\nthe coils on the armature of the machine not lying in\r\narmature slots. These turns, the connecting conductors\r\nbetween the armature bars, lie against each other in a\r\nbelt extending around the circumference of the armature.\r\nIn nearly all motor coils, the end turns consist of a\r\nshort section extending straight out from the armature\r\nslot, a much longer section bent nearly parallel with the\r\ncore, an abruptly curved end section, and two lengths\r\nsimilar to the first two. It is obvious that the accurate\r\ndetermination of the inductance of such coils must take\r\ninto account the peculiar shape of the coils and the effect\r\nof the coils upon each other. It is this second effect\r\nwhich is usually neglected in determinations of the\r\nreactance. Actually this mutual inductance is of greater\r\nimportance than the self inductance of the coils.
\r\n" }, { "name": "Murdock, Keith", "degree": "Masters", "year": "1933", "title": "Investigations on the Performances of Centrifugal Pumps with Various Alterations of the Impeller", "advisor": "Knapp, Robert T.", "url": "https://resolver.caltech.edu/CaltechTHESIS:10302017-100813657", "creators": [ { "name": { "family": "Murdock", "given": "Keith" }, "id": "Murdock-Keith", "display_name": "Murdock, Keith" } ], "advisors": [ { "name": { "family": "Knapp", "given": "Robert T." }, "id": "Knapp-R-T", "role": "advisor", "display_name": "Knapp, Robert T." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "mecheng" ], "doi": "10.7907/QNC1-NQ05", "abstract": "Several years ago the writer conferred in settling the problem of changing the operation of a pump delivering 5500 gal. per minute at 168 feet head to that of delivering 3000 gal. per minute at 146 feet head. The driving motor was a 2200 volt A.C. synchronous motor.
\r\n\r\nThe driving speed could not be altered, and the diameter of the impeller could be cut down only a certain amount before the delivery head would be below that required. At the lowest permissible head of operation the delivery was still excessive unless throttling was resorted to. The head delivery curve was so flat at that operating range, throttling of considerable extent would have to be resorted to in order to have sufficient delivery head leaway to meet the slightly fluctuating operating conditions.
\r\n\r\nThe writer made the suggestion that the impeller be altered by blocking off part of the ports, having in mind that such an alteration would permit the pump to continue delivering at sufficient head to meet the requirements, but the capacity would be reduced to the desired amount without the necessity of throttling. It was hoped to gain a substantial savings in operating power by such a procedure.
\r\n\r\nInquiry was made of the pump manufacturers to get all possible information concerning any such alterations as might he made to so change the operating characteristics of the pump. They had no information on that phase of the subject they said, and suggested a different impeller. Inasmuch as the change was deemed to be but temporary, it was thought inadvisable to purchase a different impeller, and further, inasmuch as the suggested alteration of the impeller was apparently in a strange field with no information available on the subject, and continuity of service of the pump was of paramount importance, it was thought inadvisable to alter the impeller other than turning down the diameter as far as the delivery head would permit, a good margin of safety being necessary on account of the almost horizontal characteristic of the head-delivery curve at that operating condition.
\r\n\r\nDue to the experience recounted the following research was conducted to obtain the information desired concerning the alteration of the impeller of a centrifugal pump, such that in the field the impeller may be readily and cheaply altered so the pump will deliver more economically, with the desired factor of safety, at operating conditions of lesser capacity than those for which the pump was originally designed.
" }, { "name": "Omsted, Harald", "degree": "Masters", "year": "1933", "title": "Economic Spacing of Counterforts in Reinforced Concrete Retaining Walls", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09252024-201318055", "creators": [ { "name": { "family": "Omsted", "given": "Harald" }, "id": "Omsted-Harald", "display_name": "Omsted, Harald" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/gp56-k182", "abstract": "No abstract." }, { "name": "Roach, Harold", "degree": "Masters", "year": "1933", "title": "The Economic Design of Water Pipe Lines in Southern California", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09242024-221223157", "creators": [ { "name": { "family": "Roach", "given": "Harold" }, "id": "Roach-Harold", "display_name": "Roach, Harold" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/rm0g-1589", "abstract": "No abstract." }, { "name": "Smits, Howard Gardner", "degree": "Masters", "year": "1933", "title": "The Stress Determination by the Photo Elastic Method of the Shrinkage Stresses in a Gravity Dam", "advisor": "von K\u00e1rm\u00e1n, Theodore", "url": "https://resolver.caltech.edu/CaltechTHESIS:09232024-220037743", "creators": [ { "name": { "family": "Smits", "given": "Howard Gardner" }, "id": "Smits-Howard-Gardner", "display_name": "Smits, Howard Gardner" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/g3vr-5d04", "abstract": "No abstract." }, { "name": "Wong, David Yue-Kwong", "degree": "Masters", "year": "1933", "title": "The Economical Spacing of Roof Trusses", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:10112024-180914262", "creators": [ { "name": { "family": "Wong", "given": "David Yue-Kwong" }, "id": "Wong-David-Yue-Kwong", "display_name": "Wong, David Yue-Kwong" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/hyhf-hy15", "abstract": "No abstract." }, { "name": "Batchelder, Dean Eildermann", "degree": "Masters", "year": "1932", "title": "A Study of the Pasadena Power and Light System", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09172024-204614121", "creators": [ { "name": { "family": "Batchelder", "given": "Dean Eildermann" }, "id": "Batchelder-Dean-Eildermann", "display_name": "Batchelder, Dean Eildermann" }, { "name": { "family": "Butler", "given": "Albert" }, "id": "Butler-Albert", "display_name": "Butler, Albert" }, { "name": { "family": "Olmsted", "given": "Ennis Gunning" }, "id": "Olmsted-Ennis-Gunning", "display_name": "Olmsted, Ennis Gunning" }, { "name": { "family": "Wright", "given": "Lowell John" }, "id": "Wright-Lowell-John", "display_name": "Wright, Lowell John" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/vggb-gt59", "abstract": "No abstract." }, { "name": "Boothe, Perry Mattison", "degree": "Masters", "year": "1932", "title": "The Operation of Centrifugal Pumps Under Abnormal Conditions", "advisor": "Knapp, Robert T.", "url": "https://resolver.caltech.edu/CaltechETD:etd-07172007-153248", "creators": [ { "name": { "family": "Boothe", "given": "Perry Mattison" }, "id": "Boothe-Perry-Mattison", "display_name": "Boothe, Perry Mattison" }, { "name": { "family": "Lewis", "given": "Charles K." }, "id": "Lewis-Charles-K", "display_name": "Lewis, Charles K." } ], "advisors": [ { "name": { "family": "Knapp", "given": "Robert T." }, "id": "Knapp-R-T", "role": "advisor", "display_name": "Knapp, Robert T." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/PBM1-G869", "abstract": "No abstract.\r\n\r\n" }, { "name": "Cravitz, Philip", "degree": "Masters", "year": "1932", "title": "The Derivation and Graphical Representation of Stress Factors in an Arch Dam, Including the Effect of Foundation Yield", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09162024-185753190", "creators": [ { "name": { "family": "Cravitz", "given": "Philip" }, "id": "Cravitz-Philip", "display_name": "Cravitz, Philip" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/p2zs-1j93", "abstract": "No abstract." }, { "name": "Leeper, Laverne Davidson", "degree": "Masters", "year": "1932", "title": "The Effect of a Varying Moisture Content on the Settlement of Soil Subjected to a Constant Load", "advisor": "Converse, Frederick James", "url": "https://resolver.caltech.edu/CaltechTHESIS:09182024-183742361", "creators": [ { "name": { "family": "Leeper", "given": "Laverne Davidson" }, "id": "Leeper-Laverne-Davidson", "display_name": "Leeper, Laverne Davidson" } ], "advisors": [ { "name": { "family": "Converse", "given": "Frederick James" }, "id": "Converse-F-J", "role": "advisor", "display_name": "Converse, Frederick James" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/dn6n-z437", "abstract": "No abstract." }, { "name": "Vanoni, Vito August", "degree": "Masters", "year": "1932", "title": "Secondary Wind Moments in a Five-Bay Ten Story Building Bent", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09232024-200641053", "creators": [ { "name": { "family": "Vanoni", "given": "Vito August" }, "id": "Vanoni-Vito-August", "display_name": "Vanoni, Vito August" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/dssp-ea18", "abstract": "No abstract." }, { "name": "White, Merit Penniman", "degree": "Masters", "year": "1932", "title": "Part One. Secondary Moments in Building Bents Due to Column Shortening. Part Two. Primary and Secondary Moments in a Building Bent Due to Foundation Settlement", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09172024-160304878", "creators": [ { "name": { "family": "White", "given": "Merit Penniman" }, "id": "White-Merit-Penniman", "display_name": "White, Merit Penniman" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/592c-ed45", "abstract": "No abstract." }, { "name": "Levine, Ernest", "degree": "Masters", "year": "1931", "title": "Concrete and Concrete Aggregates", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09092024-224804551", "creators": [ { "name": { "family": "Levine", "given": "Ernest" }, "id": "Levine-Ernest", "display_name": "Levine, Ernest" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/dck6-bj68", "abstract": "No abstract." }, { "name": "Nagashi, Masahiro Howard", "degree": "Masters", "year": "1931", "title": "A Study of Fully Developed Turbulent Flow at a Very High Reynolds Number", "advisor": "von K\u00e1rm\u00e1n, Theodore; Millikan, Clark Blanchard", "url": "https://resolver.caltech.edu/CaltechETD:etd-06142006-110528", "creators": [ { "name": { "family": "Nagashi", "given": "Masahiro Howard" }, "id": "Nagashi-Masahiro-Howard", "display_name": "Nagashi, Masahiro Howard" } ], "advisors": [ { "name": { "family": "von K\u00e1rm\u00e1n", "given": "Theodore" }, "id": "von-K\u00e1rm\u00e1n-Th", "role": "advisor", "display_name": "von K\u00e1rm\u00e1n, Theodore" }, { "name": { "family": "Millikan", "given": "Clark Blanchard" }, "id": "Millikan-C-B", "role": "advisor", "display_name": "Millikan, Clark Blanchard" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/815A-2M78", "abstract": "The object of this experiment is to make a study of a fully developed turbulent flow at a very high Reynolds Number, using a large circular tube, through with air was drawn. In determining the behavior of the air stream, Pitot tubes were used in the present experiment. This investigation is a preliminary study of the turbulence and other characteristics of the tunnel for the subsequent experiment to be conducted by Mr. A. M. Kuethe of the California Institute of Technology. In the subsequent experiment, a direct measurement of the eddying motion and a determination of the values of mischungsweg distribution of the turbulent flow will be made at the same measuring sections in the same tunnel, using an electric anemometer and oscillograph method." }, { "name": "Noland, Thomas Jefferson, Jr.", "degree": "Masters", "year": "1931", "title": "A New Method of Stress Analysis for Arch Dams", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09112024-185103473", "creators": [ { "name": { "family": "Noland", "given": "Thomas Jefferson, Jr." }, "id": "Noland-Thomas-Jefferson", "display_name": "Noland, Thomas Jefferson, Jr." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/yc44-1j62", "abstract": "No abstract." }, { "name": "Robinson, Harlan Baird", "degree": "Masters", "year": "1931", "title": "Stress Analysis in a Gravity Dam through the Use of a Model: A Report Upon Experiments Performed", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:09102024-210324493", "creators": [ { "name": { "family": "Robinson", "given": "Harlan Baird" }, "id": "Robinson-Harlan-Baird", "display_name": "Robinson, Harlan Baird" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/9md8-r580", "abstract": "No abstract." }, { "name": "Zahorski, Adam Teodor", "degree": "Masters", "year": "1931", "title": "On the Torsion of Wings", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-04172008-075520", "creators": [ { "name": { "family": "Zahorski", "given": "Adam Teodor" }, "id": "Zahorski-Adam-Teodor", "display_name": "Zahorski, Adam Teodor" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/E0T0-P929", "abstract": "Methods of investigation of pure torsion differ in many ways from the general method of procedure for other types of stresses. First it is very difficult to subject a body to a pure torsion without superposing bending moments; second the exact determination of twisting moment is in most cases very doubtful; third, a body subjected to torsional shearing stresses in general does not deform according to a simple law, but this deformation is usually a function of the geometry of the body." }, { "name": "Cline, Frederick R.", "degree": "Masters", "year": "1930", "title": "A Report on the Water Supply of the Owens Valley, California", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:08212024-200109874", "creators": [ { "name": { "family": "Cline", "given": "Frederick R." }, "id": "Cline-Frederick-R.", "display_name": "Cline, Frederick R." } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/wc33-9c87", "abstract": "No abstract." }, { "name": "Evans, Thomas Hayhurst", "degree": "Masters", "year": "1930", "title": "Investigation of Probable Power Variation of Black Canyon Reservoir", "advisor": "Thomas, Franklin", "url": "https://resolver.caltech.edu/CaltechTHESIS:08202024-180057426", "creators": [ { "name": { "family": "Evans", "given": "Thomas Hayhurst" }, "id": "Evans-Thomas-Hayhurst", "display_name": "Evans, Thomas Hayhurst" } ], "advisors": [ { "name": { "family": "Thomas", "given": "Franklin" }, "id": "Thomas-Franklin", "role": "advisor", "display_name": "Thomas, Franklin" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/1ntd-ma81", "abstract": "No abstract." }, { "name": "Hugg, Ernest Branch", "degree": "Masters", "year": "1930", "title": "Analysis of Hingeless Arches by Deflection Measurements of Elastic Models with Mathematical Analyses Based on the Theory of Elasticity", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:08272024-224146708", "creators": [ { "name": { "family": "Hugg", "given": "Ernest Branch" }, "id": "Hugg-Ernest-Branch", "display_name": "Hugg, Ernest Branch" }, { "name": { "family": "Olman", "given": "Samuel" }, "id": "Olman-Samuel", "display_name": "Olman, Samuel" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/qn7e-1588", "abstract": "No abstract." }, { "name": "Sechler, Ernest Edwin", "degree": "Masters", "year": "1930", "title": "Problems Relating to the Use of Sheet Metal in Airplane Construction", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-10142005-081946", "creators": [ { "name": { "family": "Sechler", "given": "Ernest Edwin" }, "id": "Sechler-Ernest-Edwin", "display_name": "Sechler, Ernest Edwin" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "aeronautics" ], "doi": "10.7907/RP44-R311", "abstract": "Sheet metal as used in present airplane construction may have two separate and distinct functions. The first of these is merely to supplant fabric or other covering material on the airplane. The structure of the airplane is not altered and the load is completely taken by the framework. The added strength and durability of this type of covering is usually connected with an increase in weight which makes the practice uneconomical. This use of metal is not a very serious design problem since it is only used as a covering and fairing and its strength is not included in the calculated strength of the structure.
\r\n\r\nSecondly, the sheet metal can be designed so it will take part or all of the loads on the airplane. It is this use of sheet metal, and its attendant problems, that will be discusssed here. Those problems that have been solved will be mentioned first and those yet undetermined will then be outlined. To be solved the answer to a problem must be in such a form as to be available and understandable to the average airplane designer without the use of long and intricate mathematical calculations. This means that those problems are solved which could be incorporated in a handbook for designers and those which could not be so incorporated are not solved for the designer.
" }, { "name": "Thatcher, John William", "degree": "Masters", "year": "1930", "title": "Flashover of Cylindrical Insulators in Homogenous Electric Fields with Variable Temperature and Humidity", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:08272024-163746001", "creators": [ { "name": { "family": "Thatcher", "given": "John William" }, "id": "Thatcher-John-William", "display_name": "Thatcher, John William" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/1rq6-ca21", "abstract": "No abstract." }, { "name": "Gramatky, Ferdinand Gunner", "degree": "Masters", "year": "1929", "title": "Siphon Spillway", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-02252005-160805", "creators": [ { "name": { "family": "Gramatky", "given": "Ferdinand Gunner" }, "id": "Gramatky-Ferdinand-Gunner", "display_name": "Gramatky, Ferdinand Gunner" }, { "name": { "family": "Robinson", "given": "Kenneth Hall" }, "id": "Robinson-Kenneth-Hall", "display_name": "Robinson, Kenneth Hall" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/972C-WG13", "abstract": "A brief summary of conclusions drawn from this work is as follows:
\r\n\r\n1. The coefficient of discharge increases directly as the operating head on a siphon spillway while discharging into deep water, and decreases rapidly with increase of head when discharge is in shallow water and air.
\r\n\r\nThe rate of discharge increases with the head, and approaches a nearly constant value for higher heads.
\r\n\r\nSimilar tests made on the model without the air trap seal has the effect of increasing the rate of discharge when discharging into air, and a slight increase of the coefficient of discharge at lower heads.
\r\n\r\n2. Better means of measuring pressure must be sought, and until then, accurate means of obtaining losses from point to point are not available. A Pitot tube exploration seems the best suggestion. The maximum losses are in the entrance, throat, and bend over the crest. Q = AV does not hold for ordinary piezometer tube measurements, and Bernoulli's theorem may not be applied.
\r\n\r\n3. The principles of similitude my be applied to the siphon, and the scale factor may be increased to 4, with all characteristics remaining the same. The discharge varies as the five halves power of the scale factor.
" }, { "name": "Kingman, Douglas George", "degree": "Masters", "year": "1929", "title": "Design of a Seismometer for Local Earthquakes", "advisor": "Martel, Romeo Raoul", "url": "https://resolver.caltech.edu/CaltechTHESIS:08202024-215722798", "creators": [ { "name": { "family": "Kingman", "given": "Douglas George" }, "id": "Kingman-Douglas-George", "display_name": "Kingman, Douglas George" } ], "advisors": [ { "name": { "family": "Martel", "given": "Romeo Raoul" }, "id": "Martel-R-R", "role": "advisor", "display_name": "Martel, Romeo Raoul" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "mecheng" ], "doi": "10.7907/776b-hm65", "abstract": "No abstract." }, { "name": "Banta, Arthur Perry", "degree": "Masters", "year": "1928", "title": "The Water Permeability of Concrete and Some Factors Which Affect It", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-02252005-134411", "creators": [ { "name": { "family": "Banta", "given": "Arthur Perry" }, "id": "Banta-Arthur-Perry", "display_name": "Banta, Arthur Perry" }, { "name": { "family": "Renz", "given": "Carl Fred" }, "id": "Renz-Carl-Fred", "display_name": "Renz, Carl Fred" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/J72P-9P59", "abstract": "For a subject which has so great and vital a bearing on a large number of different types of engineering structures, the factors which govern the water permeability of concrete have received surprisingly little consideration, at least from a concerted research standpoint. Results of a few studies, on one or more of the factors which influence this property, have appeared in the literature, but with the exception of some work published by the Bureau of Standards in 1911, there has been no publication of results covering a complete or satisfactory study.
\r\n\r\nThe importance of the water permeability of concrete has long been realized, and statements by engineers have appeared which attribute many failures and unsatisfactory conditions to this factor. The evidence seems to point to a field of application for definite (though relative) data to all classes of concrete structures.
" }, { "name": "Hoover, Vaino Alexander", "degree": "Masters", "year": "1928", "title": "Condenser Motor with High Starting Torque and Low Capacitance", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-03032005-164020", "creators": [ { "name": { "family": "Hoover", "given": "Vaino Alexander" }, "id": "Hoover-Vaino-Alexander", "display_name": "Hoover, Vaino Alexander" }, { "name": { "family": "Mesenkop", "given": "Louis Henry" }, "id": "Mesenkop-Louis-Henry", "display_name": "Mesenkop, Louis Henry" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/H7V5-R649", "abstract": "The theory of the condenser motor is the operation of a poly-phase motor on a single-phase source. If we consider the current in one phase of a two-phase motor the IR drop is in phase with the current I and the reactance drop is at right angles to it. The voltage OB across the phase is the vector sum of these two. Now if a condenser is connected in series with this phase the reactance drop across the condenser will be opposite to that in the winding. The voltage across the condenser is BC and the total voltage across the condenser and the phase in series with it is OC. This is the line voltage. If the other phase of a two-phase motor is connected directly across the line the two phases will have voltages impressed on them which are electrically displaced by the angle BOC. By assigning a proper value to the capacitance of the condenser this angle can be made equal to 90 degrees. The voltage OB, however, will not be equal to the line voltage unless the angle BOA is equal to 45 degrees, that is, the power factor of the phase must be 70.7 per cent. It is not necessary to design both phases of the motor for the same voltage so that this condition does not present any great difficulty." }, { "name": "Morgan, Stanley Chapin", "degree": "Masters", "year": "1928", "title": "Resistance of High Tension Porcelain Insulators", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-02252005-151849", "creators": [ { "name": { "family": "Morgan", "given": "Stanley Chapin" }, "id": "Morgan-Stanley-Chapin", "display_name": "Morgan, Stanley Chapin" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/4VJ1-EW85", "abstract": "High tension insulators are generally built of several porcelain discs in series, the discs being connected by galvanized steel hardware. When alternating voltage is impressed across such a string the voltage is not distributed symmetrically because the charging current is not the same through the string. There is capacitance from each connector to the next, from each connector to the ground and to the line wire, as well as capacitance from one connector to one which is not adjacent. If the voltage impressed is direct and all the units or discs are exactly alike, then such an air insulator string would have across each unit the same value of voltage. A certain leakage current flows through each insulator, and the d.c. voltage across each unit will be the leakage current multiplied by the resistance of each unit.
\r\n \r\nIn the transmission of high-voltage direct current, such as the Thury system found in Europe, high-tension porcelain insulators can be used to insulate the line from the ground. Such insulators are exposed to changing weather conditions of humidity and temperature. Also, these insulators on account of being subjected to mechanical stresses, electrical stresses, and repeated temperature cycles, depreciate in resistance, become faulty, and unless detected may interfere with the operation of the transmission system. If the resistance of the insultors forming the string, and the effect produced on the resistance by temperature, humidity, etcetera, are known then it is possible to predict to a certain degree of approximation what service the insulators can give. Besides determining the condition of such insulators, a knowledge of the resistance would give a basis for comparing different types of insulators, and likewise would furnish a means for arriving at the voltage distribution of different makes and types and the uniformity with which a given type could be expected to run.
\r\n\r\nIn the investigation carried out, the results of which are tabulated below, particular attention was given to the determination of the surface and interior resistance, and the effect of change of temperature and humidity on the electrical resistance of various types and makes of high-tension porcelain insulators. The humidity effect is not an internal one, but manifests itself by changing the surface of the insulator so that a greater freedom is given to the flow of current over the surface between the cap and the pin of the insulator.
" }, { "name": "Swedlund, Lloyd Edward", "degree": "Masters", "year": "1928", "title": "A Study of an Artificial Telephone Line", "advisor": "Maxstadt, Francis W.", "url": "https://resolver.caltech.edu/CaltechETD:etd-02252005-132801", "creators": [ { "name": { "family": "Swedlund", "given": "Lloyd Edward" }, "id": "Swedlund-Lloyd-Edward", "display_name": "Swedlund, Lloyd Edward" } ], "advisors": [ { "name": { "family": "Maxstadt", "given": "Francis W." }, "id": "Maxstadt-F-W", "role": "advisor", "display_name": "Maxstadt, Francis W." } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/KARN-PM22", "abstract": "No abstract." }, { "name": "Watson, Ralph Mayhew", "degree": "Masters", "year": "1928", "title": "The Development of an Engine with a Higher Compression Ratio", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-02282005-104223", "creators": [ { "name": { "family": "Watson", "given": "Ralph Mayhew" }, "id": "Watson-Ralph-Mayhew", "display_name": "Watson, Ralph Mayhew" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "mecheng" ], "doi": "10.7907/WVTB-5T08", "abstract": "No abstract." }, { "name": "Diamos, George K. Surrapas", "degree": "Masters", "year": "1927", "title": "Flashover of Insulation in Homogenous Electric Fields", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-04232004-141712", "creators": [ { "name": { "family": "Diamos", "given": "George K. Surrapas" }, "id": "Diamos-George-K-Surrapas", "display_name": "Diamos, George K. Surrapas" }, { "name": { "family": "Lewis", "given": "William Abbett" }, "id": "Lewis-William-Abbett", "display_name": "Lewis, William Abbett" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/QVT8-2G06", "abstract": "No Abstract." }, { "name": "Maxstadt, Francis William", "degree": "Masters", "year": "1925", "title": "Obtaining Steady High-Voltage Direct Current from a Thermionic Rectifier, Without a Filter", "advisor": "Millikan, Robert Andrews", "url": "https://resolver.caltech.edu/CaltechETD:etd-06102004-134750", "creators": [ { "name": { "family": "Maxstadt", "given": "Francis William" }, "id": "Maxstadt-Francis-William", "display_name": "Maxstadt, Francis William" } ], "advisors": [ { "name": { "family": "Millikan", "given": "Robert Andrews" }, "id": "Millikan-R-A", "role": "advisor", "display_name": "Millikan, Robert Andrews" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "eleceng" ], "doi": "10.7907/V4MZ-YR84", "abstract": "The usual polyphase high-voltage rectifier produces a potential essentially constant out having superposed on it a \"ripple\" or alternating component whose amplitude on each side of the mean is from five to seven per cent of the total d-c. voltage. Condensers and reactors are used to filter the ripple out. The paper describes a special type of a-c. generator which will give the proper low-voltage wave form for rectification as a more nearly smooth direct potential. A method of manually or automatically varying the low-voltage wave form according to load demands is provided so as to keep the rectified potential steady, thus avoiding the necessity for the filter which in sets for 100,000 volts or more would be quite expensive and troublesome." }, { "name": "Cheng, Ching Yun", "degree": "Masters", "year": "1924", "title": "A Study of the Proposed Diamond Creek Reservoir", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechTHESIS:06162015-113550836", "creators": [ { "name": { "family": "Cheng", "given": "Ching Yun" }, "id": "Cheng-Ching-Yun", "display_name": "Cheng, Ching Yun" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/ZJ6X-1G98", "abstract": "Politically the Colorado river is an\r\ninterstate as well as an\r\ninternational stream. Physically the basin divides\r\nitself\r\ndistinctly into three sections. The upper section from head\r\nwaters to the mouth of San Juan comprises about 40 percent of\r\nthe total of the basin and affords about 87 percent of the\r\ntotal runoff, or an average of about 15 000 000 acre feet per\r\nannum. High mountains and cold weather are found in this\r\nsection. The middle section from the mouth of San Juan to the\r\nmouth of the Williams comprises about 35 percent of the total\r\narea of the basin and supplies about 7 percent of the annual\r\nrunoff. Narrow canyons and mild weather prevail in this\r\nsection. The lower third of the basin is composed of mainly\r\nhot arid plains of low altitude. It comprises some 25 percent\r\nof the total area of the basin and furnishes about 6 percent\r\nof the average annual runoff.
\r\n\r\n\r\nThe proposed Diamond Creek reservoir is located in the\r\nmiddle section and is wholly within the boundary of Arizona.\r\nThe site is at the mouth of Diamond Creek and is only 16 m.\r\nfrom Beach Spring, a station on the Santa Fe railroad. It is\r\nsolely a power project with a limited storage capacity. The\r\ndam which creats the reservoir is of the gravity type to be\r\nconstructed across the river. The walls and foundation are\r\nof granite. For a dam of 290 feet in height, the back water\r\nwill be about 25 m. up the river.
\r\n\r\nThe power house will be placed right below the dam\r\nperpendicular to the axis of the river. It is entirely a \r\nconcrete structure. The power installation would consist of\r\neighteen 37 500 H.P. vertical, variable head turbines, directly\r\nconnected to 28 000 kwa. 110 000 v. 3 phase, 60 cycle generators\r\nwith necessary switching and auxiliary apparatus. Each unit is\r\nto be fed by a separate penstock wholly embedded into the masonry.
\r\n\r\nConcerning the power market, the main electric transmission\r\nlines would extend to Prescott, Phoenix, Mesa, Florence etc.\r\nThe mining regions of the mountains of Arizona would be the\r\nmost adequate market. The demand of power in the above named\r\nplaces might not be large at present. It will, from the \r\nobservation of the writer, rapidly increase with the wonderful\r\nadvancement of all kinds of industrial development.
\r\n\r\nAll these things being comparatively feasible, there is one\r\ndifficult problem: that is the silt. At the Diamond Creek dam\r\nsite the average annual silt discharge is about 82 650 acre\r\nfeet. The geographical conditions, however, will not permit\r\nsilt deposites right in the reservoir. So this design will be\r\nmade under the assumption given in Section 4.
\r\n\r\nThe silt condition and the change of lower course of the\r\nColorado are much like those of the Yellow River in China. But\r\none thing is different. On the Colorado most of the canyon\r\nwalls are of granite, while those on the Yellow are of alluvial\r\nloess: so it is very hard, if not impossible, to get a favorable\r\ndam site on the lower part. As a visitor to this country, I\r\nshould like to see the full development of the Colorado: but\r\nhow about THE YELLOW!
\r\n\r\n" }, { "name": "Cheng, Ching Yun", "degree": "Masters", "year": "1924", "title": "Control of the Yellow River in China", "advisor": "Unknown, Unknown", "url": "https://resolver.caltech.edu/CaltechETD:etd-04142004-152823", "creators": [ { "name": { "family": "Cheng", "given": "Ching Yun" }, "id": "Cheng-Ching-Yun", "display_name": "Cheng, Ching Yun" } ], "advisors": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "committee": [ { "name": { "family": "Unknown", "given": "Unknown" }, "display_name": "Unknown, Unknown" } ], "option_major": [ "civileng" ], "doi": "10.7907/470N-S596", "abstract": "No Abstract." } ]