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A unified theory of flow control and routing in data communication networks

Golestaani, Seyyed Jamaaloddin
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 94 leaves; 5064620 bytes; 5064383 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
75.5%
by Seyyed Jamaaloddin Golestaani.; Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1980.; MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.; Includes bibliographical references.

Computer control of stochastic distributed systems with applications to very large electrostatically figured satellite antennas

Lang, Jeffrey (Jeffrey H.)
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 366 leaves; 17591355 bytes; 17591115 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
75.49%
by Jeffrey Hastings Lang.; MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.; Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1980.; Includes bibliographical references.

Theory and practice of text editors, or, A cookbook for an Emacs

Finseth, Craig A
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 103 leaves; 6999849 bytes; 6999609 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
75.47%
by Craig Alan Finseth.; Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1980.; MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.; Bibliography: leaves 88-96.

Analysis of a tandem queue model of a transfer line

Wiley, Richard Paul
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: x, 189 leaves; 7224478 bytes; 7224233 bytes; application/pdf; application/pdf
ENG
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75.47%
by Richard Paul Wiley.; Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1982.; MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.; Bibliography: leaves 186-189.

Theory and applications of image motion estimation

Hinman, Brian Lee
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 168 leaves; 10799101 bytes; 10798859 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
75.47%
by Brian Lee Hinman.; Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1984.; MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.; Bibliography: leaves 131-135.

System theory for two point boundary value descriptor systems

Nikoukhah, Ramine
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 133 p.; 5179117 bytes; 5178877 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
75.47%
by Ramine Nikoukhah.; Thesis (Elec. E.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1986.; MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING; Bibliography: p. 131-133.

Laser radar tracking theory : track-while-image operation

Enders, Robert H
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 112 leaves; 6640396 bytes; 6640151 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
75.47%
by Robert Hay Enders.; Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.; Vita.; Includes bibliographical references.; Supported by U.S. Army Research Office. DAAL03-87-K-0117

A deterministic and stochastic theory for two-point boundary-value descriptor systems

Nikoukhah, Ramine
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 250 p.; 11292634 bytes; 11292390 bytes; application/pdf; application/pdf
ENG
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75.47%
by Ramine Nikoukhah.; Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.; Includes bibliographical references (p. 247-250).

Property testing : theory and applications

Raskhodnikova, Sofya, 1976-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 111 p.; 6735684 bytes; 6749236 bytes; application/pdf; application/pdf
EN_US
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75.47%
(cont.) We show upper and lower bounds for the general problem and for specific partial orders. A few of our intermediate results are of independent interest. 1. If strings with a property form a vector space, adaptive 2-sided error tests for the property have no more power than non-adaptive 1-sided error tests. 2. Random LDPC codes with linear distance and constant rate are not locally testable. 3. There exist graphs with many edge-disjoint induced matchings of linear size. In the final part of the thesis, we initiate an investigation of property testing as applied to images. We study visual properties of discretized images represented by n x n matrices of binary pixel values. We obtain algorithms with the number of queries independent of n for several basic properties: being a half-plane, connectedness and convexity.; Property testers are algorithms that distinguish inputs with a given property from those that are far from satisfying the property. Far means that many characters of the input must be changed before the property arises in it. Property testing was introduced by Rubinfeld and Sudan in the context of linearity testing and first studied in a variety of other contexts by Goldreich, Goldwasser and Ron. The query complexity of a property tester is the number of input characters it reads. This thesis is a detailed investigation of properties that are and are not testable with sublinear query complexity. We begin by characterizing properties of strings over the binary alphabet in terms of their formula complexity. Every such property can be represented by a CNF formula. We show that properties of n-bit strings defined by 2CNF formulas are testable with O([square root of]n) queries...

Stochastic realization theory for exact and approximate multiscale models

Tucker, Dewey S. (Dewey Stanton)
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 252 p.; 18968580 bytes; 18980961 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
75.47%
The thesis provides a detailed analysis of the independence structure possessed by multiscale models and demonstrates that such an analysis provides important insight into the multiscale stochastic realization problem. Multiscale models constitute a broad class of probabilistic models which includes the well--known subclass of multiscale autoregressive (MAR) models. MAR models have proven useful in a variety of different application areas, due to the fact that they provide a rich set of tools for various signal processing tasks. In order to use these tools, however, a MAR or multiscale model must first be constructed to provide an accurate probabilistic description of the particular application at hand. This thesis addresses this issue of multiscale model identification or realization. Previous work in the area of MAR model identification has focused on developing algorithms which decorrelate certain subsets of random vectors in an effort to design an accurate model. In this thesis, we develop a set-theoretic and graph-theoretic framework for better understanding these types of realization algorithms and for the purpose of designing new such algorithms.; (cont.) The benefit of the framework developed here is that it separates the realization problem into two understandable parts - a dichotomy which helps to clarify the relationship between the exact realization problem...

Dielectric Resonator Antennas : theory and design; DRA : theory and design

Lim, Beng-Teck, 1974-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 122 leaves
ENG
Relevância na Pesquisa
75.51%
Theoretical models for the analysis of Dielectric Resonator Antenna (DRA) are developed. There are no exact solutions to many of the problems in analytical form, therefore a strong focus on the physical interpretation of the numerical results is presented alongside theoretical models. I have used the physical interpretation of the numerical results to lay down some important design rules. A few new inventions associated with the DRA are also included. These are the elliptical DRA, the DRA with a rectangular slot, the adjustable reactance feed, the triangular DRA and the dual band DRA-patch antenna.; by Beng-Teck Lim.; Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.; Includes bibliographical references (leaves 117-122).

Theory and simulation of amorphous organic electronic devices

Madigan, Conor (Conor Francis), 1978-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 478 p.
ENG
Relevância na Pesquisa
75.47%
The electronic properties of amorphous organic thin films are of great interest due to their application in devices such as light emitting devices, solar cells, photodetectors, and lasers. Compared to conventional inorganic semiconductors, amorphous organic thin films have the potential to enable entirely new functionality, larger areas, higher efficiencies, flexible substrates, and inexpensive fabrication. The development of amorphous organic electronic devices requires a deep understanding of the physics of the underlying electronic processes, which are controlled by the behavior of polarons (charged molecular states), and excitons (neutral molecular excited states). In this thesis we employ microscopic models of polaron and exciton processes to calculate macroscale phenomena in amorphous small molecular weight organic thin films using Monte Carlo (MC) simulations. The principle results that we report are: (1) the experimental demonstration and theoretical analysis of the previously neglected phenomenon of solid state solvation; (2) the identification of significant errors in existing models of molecular energy level disorder in polarizible media;; (cont.) (3) the most rigorously self-consistent quantitative fit of a dispersive exciton diffusion model to experimental data from a small molecular weight amorphous organic solid; (4) MC simulations of equilibrium polaron mobilities in amorophous organic solids as a function of both field and carrier concentration; and (5) MC simulations of space charge limited (SCL) currents through thin films as a function of voltage under typical operating device conditions. To our knowledge...

Computational learning theory : new models and algorithms

Sloan, Robert Hal
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 120 leaves
ENG
Relevância na Pesquisa
75.47%
by Robert Hal Sloan.; Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.; Includes bibliographical references (leaves 116-120).

Steps towards a theory of representation design

Van Baalen, Jeffrey
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 230 leaves
ENG
Relevância na Pesquisa
75.47%
by Jeffrey Van Baalen.; Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.; Includes bibliographical references.; Supported by the Advanced Research Projects Agency of the Department of Defense under Office of Naval Research. N00014-85-K-0124

General linear cameras : theory and applications; GLC : theory and applications

Yu, Jingyi, 1978-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 149 leaves
ENG
Relevância na Pesquisa
75.54%
I present a General Linear Camera (GLC) model that unifies many previous camera models into a single representation. The GLC model describes all perspective (pinhole), orthographic, and many multiperspective (including pushbroom and two-slit) cameras, as well as epipolar plane images. It also includes three new and previously unexplored multiperspective linear cameras. The GLC model is general and linear in the sense that, given any vector space where rays are represented as points, it describes all 2D affine subspaces (planes) formed by the affine combination of 3 rays. I also present theories of projection and collineation for GLCs and use these theories to explain various multiperspective distortions. Given an arbitrary multiperspective imaging system that captures smoothly varying set of rays, I show how to map the rays onto a 2D ray manifold embedded into a 4D linear vector space. The GLC model can then be use to analyze the tangent planes on this manifold. Geometric structures associated with the local GLC model of each tangent plane provide an intuitive physical interpretation of the imaging system, and they are closely related to the caustics of reflected rays. These geometric structures are characteristic of only 4 of the 8 GLC types. I also prove that the local GLC type at each tangent plane is invariant to the choice of parametrization...

Theory and design of high-index-contrast microphotonic circuits; Theory and design of HIC microphotonic circuits

Popović, Miloš, 1977-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 358 p.
ENG
Relevância na Pesquisa
75.51%
Advanced microphotonic device designs in strongly confining silicon and silicon nitride waveguides, novel photonic device concepts, and the first experimental demonstrations of these structures are described. They show a progression of new optical signal processing capabilities that enable chip-scale microphotonic routers for high bandwidth and fine granularity optical wavelength routing networks. Rigorous theoretical models are developed that enable the design of efficient high-index-contrast (HIC) microphotonic components and set theoretical bounds for their capabilities. They take into account new, coupling induced resonance-frequency shifting and parasitic loss effects. Based on microring resonators and HIC silicon and silicon nitride waveguides, the first telecom-grade microphotonic channel add-drop filters are demonstrated, including novel, dispersion-free switchable and widely tunable designs. Several new classes of optical devices are proposed. The first, universally balanced interferometers, enable filters capable of "fully transparent" tuning and increased accessible wavelength range, facilitate a novel proposed photonic-circuit "hot-swapping" functionality, and approximate an optical nearinverse operator in a general way. The second...

Research in Computer Science and Computer Engineering

Feldman, J. A. ; Merriam, C. W.
Fonte: University of Rochester. Computer Science Department. Publicador: University of Rochester. Computer Science Department.
Tipo: Relatório
ENG
Relevância na Pesquisa
85.53%
This report describes many of the computer related research efforts at the University of Rochester. The Department of Computer Science is involved in research in automatic programming, including very high level languages and data structures; machine perception; and in problem solving using combinations of traditional heuristic methods, artificial intelligence,and utility theory. The research of the Department of Electrical Engineering includes basic computer engineering research in the construction of computer systems and operating systems, research in image processing and in numerical methods, and research in production automation which is concerned with mechanical manufacturing and assembly, and is currently developing mathematical models of parts, raw materials and tools. In conjunction with other departments, Electrical Engineering is also using computers for biomedical applications including ultrasound diagnostic techniques for heart disease, and pattern recognition techniques for detection of cancer from PAP smears.

Research in Computer Science and Computer Engineering

Feldman, J. A. ; Merriam, C. W.
Fonte: University of Rochester. Computer Science Department. Publicador: University of Rochester. Computer Science Department.
Tipo: Relatório
ENG
Relevância na Pesquisa
85.53%
This report describes many of the computer related research efforts at the University of Rochester. The Department of Computer Science is involved in research in automatic programming, including very high level languages and data structures; machine perception; and in problem solving using combinations of traditional heuristic methods, artificial intelligence,and utility theory. The research of the Department of Electrical Engineering includes basic computer engineering research in the construction of computer systems and operating systems, research in image processing and in numerical methods, and research in production automation which is concerned with mechanical manufacturing and assembly, and is currently developing mathematical models of parts, raw materials and tools. In conjunction with other departments, Electrical Engineering is also using computers for biomedical applications including ultrasound diagnostic techniques for heart disease, and pattern recognition techniques for detection of cancer from PAP smears.

Stochastic chaos and thermodynamic phase transitions : theory and Bayesian estimation algorithms

Deng, Zhi-De
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 200 p.
ENG
Relevância na Pesquisa
75.54%
The chaotic behavior of dynamical systems underlies the foundations of statistical mechanics through ergodic theory. This putative connection is made more concrete in Part I of this thesis, where we show how to quantify certain chaotic properties of a system that are of relevance to statistical mechanics and kinetic theory. We consider the motion of a particle trapped in a double-well potential coupled to a noisy environment. By use of the classic Langevin and Fokker-Planck equations, we investigate Kramers' escape rate problem. We show that there is a deep analogy between kinetic rate theory and stochastic chaos, for which we propose a novel definition. In Part II, we develop techniques based on Volterra series modeling and Bayesian non-linear filtering to distinguish between dynamic noise and measurement noise. We quantify how much of the system's ergodic behavior can be attributed to intrinsic deterministic dynamical properties vis-a-vis inevitable extrinsic noise perturbations.; by Zhi-De Deng.; Thesis (M. Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.; Includes bibliographical references (p. 177-200).

Applications of group theory to few-body physics

Chaudhary, Irfan Ullah, 1970-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 262 leaves; 8578703 bytes; 8613279 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
75.53%
Over the past fifteen years, there have been persistent claims of anomalous nuclear reactions in condensed matter environments. A Unified Model [38] has been proposed to systematically account for most of these anomalies. However, all the work done so far has used simple scalar nuclear Hamiltonians. In this thesis, we develop the tools necessary to use a realistic nuclear Hamiltonian in the Unified Model. A natural way to include a realistic nuclear potential in the Unified Model is via the method of coupled-channel equations. The phenomenological nuclear interaction chosen is the Hamada-Johnston potential [40]. The major portion of the thesis is devoted to deriving the coupled-channel equations with explicit symmetry constraints for the Hamada-Johnston potential. A critical input in this derivation is the calculation of the matrix elements of the various channels. We develop a systematic method, based on group theory, for calculating matrix elements of few-body correlated spatial wavefunctions. This method can, in some sense, be considered a generalization of Racah's viewpoint [17] of calculating shell-model matrix elements. Towards the end, two related, but somewhat different topics are explored. Firstly, a simple phonon-coupled nuclear reaction...