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caltechETD 檢索結果共 5156 筆,本頁資料從第 109 筆到第 120 筆

A number of nanophotonic integrated circuits are presented, which take advantage of the unique properties that light has when guided in very small waveguides to achieve novel functionality. The devices studied are designed to operate with light in the 1400-1600 nm range. Nanophotonic integrated circuits are tiny waveguides and other optical devices that are fabricated o....

By Tom Wetteland Baehr-Jones--California Institute of Technology--2006-05-04
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Every day we are inundated with a mass of sensory inputs providing a continual stream of relevant and irrelevant, redundant and conflicting, information about the external world. Mature brains are very capable in integrating this confusion of input into a unified percept, but this is a non-trivial task for infants, whose brains and sensory systems are still immature at ....

By Patricia Ann Neil-Computation and Neural Systems-California Institute of Technology-doctoral-2006-05-03
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This thesis investigates the application of formal engineering design synthesis methodologies to the development of sensor and control systems for intelligent vehicles. A formal engineering design synthesis methodology based on evolutionary computation is presented, with special emphasis on dealing with modern engineering design challenges, such as high or variable comp....

By Yizhen Zhang--California Institute of Technology--2006-05-03
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We have studied the mechanisms of mitochondrial fusion and fission in S. cerevisiae. Using a proteomics-based approach, we have identified the WD domain protein Caf4p as a Fis1p binding partner that, along with its paralog Mdv1p, functions as a molecular adaptor between Fis1p and Dnm1p. This work defines a role for Mdv1p and Caf4p in the recruitment of Dnm1p to mitochon....

By Erik Edmund Griffin--California Institute of Technology--2006-05-03
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Homogeneity of price is an implicit yet fundamental assumption underlying price based resource allocation theory. In this thesis, we study the effects of relaxing this assumption by examining a concrete engineering system (network with heterogeneous congestion control protocols). The behavior of the system turns out to be very different from the homogeneous case and can....

By Ao Tang--California Institute of Technology--2006-05-03
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Optical microcavities can be characterized by two key quantities: an effective mode volume Veff, which describes the per photon electric field strength within the cavity, and a quality factor Q, which describes the photon lifetime within the cavity. Cavities with a small Veff and a high Q offer the promise for applications in nonlinear optics, sensing, and cavity quantu....

By Kartik Srinivasan--California Institute of Technology--2006-05-03
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Stochastic partial differential equations (SPDEs) are important tools in modeling complex phenomena, and they arise in many physics and engineering applications. Developing efficient numerical methods for simulating SPDEs is a very important while challenging research topic. In this thesis, we study a numerical method based on the Wiener chaos expansion (WCE) for solvin....

By Wuan Luo--California Institute of Technology--2006-05-02
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The dynamic interaction of mantle plumes with subducted slabs and plate-scale flow is studied in Part I. We found that plumes preferentially develop on the edge of slabs and that a substantial amount of hot mantle can be trapped beneath slabs over long periods of time, leading to "mega-plume" formation. We used the solver-coupling technique to study the deflection of pl....

By Eh Tan--California Institute of Technology--2006-05-02
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This thesis is a theoretical investigation of the classical and quantum information processing enabled by the advent of modern ultrafast nonlinear optics. Chapter 2 and 3 study the propagation of ultrashort optical pulses in optical fibers, and propose two methods of compensating the linear and nonlinear distortions experienced by the pulses, namely, reverse propagation....

By Mankei Tsang--California Institute of Technology--2006-05-02
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This thesis explores how natural selection acts on organisms such as viruses that have either highly error-prone reproduction or face variable environmental conditions or both. By modeling population dynamics under these conditions, we gain a better understanding of the selective forces at work, both in our simulations and hopefully also in real organisms. With an under....

By Robert Burke Forster--California Institute of Technology--2006-04-21
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The patterns in which individuals interact have important consequences. One notable phenomenon is social learning, which occurs when asymmetrically informed individuals observe the choices of others before making their own choices. This process can lead to information cascades in which the ability to learn from others ceases quickly, implying little information aggregat....

By Brian W. Rogers--California Institute of Technology--2006-04-20
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The aim of this thesis is to analyze various effects of informational constraints. In chapters 1 and 2 we consider a robust model of bilateral trade where traders have private reservation values and utility functions are common knowledge. In chapter 1 we study direct-revelation mechanisms. Under incentive and participation constraints, we define the notion of ex-post co....

By Jernej Copic--California Institute of Technology--2006-04-19
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