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caltechETD 檢索結果共 5156 筆,本頁資料從第 25 筆到第 36 筆

The research that led to this thesis was inspired by Sudan's breakthrough that demonstrated that Reed-Solomon codes can correct more errors than previously thought. This breakthrough can render the current state-of-the-art Reed-Solomon decoders obsolete. Much of the importance of Reed-Solomon codes stems from their ubiquity and utility. This thesis takes a few steps tow....

By Mostafa El-Khamy-Electrical Engineering-California Institute of Technology-doctoral-2006-09-06
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Telomerase is an enzyme responsible for the maintenance of eukaryotic chromosome ends. The two main components required for activity are a protein subunit, the human telomerase reverse transcriptase (hTERT), and an RNA subunit, the human telomerase RNA (hTR). While telomerase is not active in most normal human cells, roughly 85% to 90% of oncogenic cells display increas....

By Christine Terumi Ueda-Chemistry-California Institute of Technology-doctoral-2006-09-05
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The increasing utilization of networks, especially wireless networks, for different applications and in different aspects of modern life, has directed a great deal of attention towards the analysis and optimal design of networks. Distinguishing features of the wireless environment and the distributed nature of the network setup have raised many important challenges in f....

By Amir Farajidana-Electrical Engineering-California Institute of Technology-doctoral-2006-09-05
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A new technique for measuring the hydrogen isotopic compositions of small quantities of hydrous and nominally anhydrous silicate materials was developed. The hydrogen isotopic composition of mantle derived basalts and nominally anhydrous minerals were measured to examine the systematics of the hydrogen isotope geochemistry of the mantle and to better constrain the mantl....

By Julie Ann O'Leary-Geological and Planetary Sciences-California Institute of Technology-doctoral-2006-09-05
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Coordination in networked multi-agent systems attracts significant interest in the realm of engineering. Typical examples include formations of unmanned aerial vehicles, automated highway systems, and sensor networks. One common feature for these systems is that coordinated behaviors are exhibited by interactions among agents where information exchange and manipulation ....

By Zhipu Jin-Electrical Engineering-California Institute of Technology-doctoral-2006-09-01
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This thesis explores the feasibility of using synthetic jet actuators for the propulsion of small underwater vehicles. This work was inspired by the widespread use of pusatile jet propulsion by sea creatures such as squid, salp, and jellyfish. The jets created by these animals utilize vortex rings for thrust production. A method for creating similar vortex ring-based je....

By AnnMarie Polsenberg Thomas-Mechanical Engineering-California Institute of Technology-doctoral-2006-08-25
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The work presented in this thesis is mainly divided in two parts. In the first part we study the problem of distributed averaging, which has attracted a lot of interest in the research community in recent years. Our work focuses on the issues of implementing distributed averaging algorithms on peer-to-peer networks such as the Internet. We present algorithms that elimin....

By Mortada Mehyar-Electrical Engineering-California Institute of Technology-doctoral-2006-08-21
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Rotating Rayleigh-Benard convection (rRBC) is studied as a paradigmatic example of pattern formation and spatiotemporal chaos. For large enough rotation rates, this system undergoes a supercritical bifurcation from the uniform state to a state known as domain chaos. In domain chaos, domains of straight parallel rolls change their orientation and size discretely. This ro....

By Janet D Scheel-Physics-California Institute of Technology-doctoral-2006-08-14
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Wireless communications have gained much currency in the last few decades. In this thesis we present results regarding several wireless communication systems, in particular, wireless networks. For some time now, it has been known that in an ad hoc network in which nodes share the wireless medium, and the connection strengths between nodes follow a distance-based decay l....

By Radhika Gowaikar-Electrical Engineering-California Institute of Technology-doctoral-2006-07-25
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This thesis reports the results of investigations intended to further the understanding of the formation and evolution of spheromak plasmas via the use of laser induced fluorescence (LIF) measurements of laboratory plasmas. LIF is a spectroscopic technique in which laser radiation induces atomic energy level transitions in a target species within a specified volume. LIF....

By Steven Edmund Pracko-Applied Physics-California Institute of Technology-doctoral-2006-07-25
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Soils play a large role in the cycling of atmospheric trace gases and are an important component of the climate system. The bulk of my thesis was directed at the role of soils in the global molecular hydrogen (H2) cycle. I conducted field measurements of H2 uptake in three Southern California ecosystems, and found that both the diffusion of H2 into soils and the distrib....

By Nicole V. Smith Downey-Geological and Planetary Sciences-California Institute of Technology-doctoral-2006-07-20
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The circuitries within the spinal cord are remarkably robust and plastic. Even in the absence of supraspinal control, such circuitries are capable of generating functional movements and changing their level of excitability based on a specific combination of properceptive inputs going into the spinal cord. This has led to an increase in locomotor training, such as Body W....

By Lance Lin-Lan Cai-Bioengineering-California Institute of Technology-doctoral-2006-07-19
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