Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 74 for “"Performance Limits"”.
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Performance limits on chemical computation
… relation between the design tuple, and the "performance tuple": (operating frequency, signal density, error rate). I give a lower bound on the probability of a logic error in one computation step, and an upper bound on the frequency of operation, both as functions of the design tuple. I …
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Performance limits of RF power CMOS
… = 2 GHz on 45 nm CMOS devices. This record power performance was made possible through careful device layout for minimized parasitic resistances and capacitances. Total output power approaching 70 mW was measured on 45 nm CMOS devices by increasing the device width to 640 gm. However, we find that …
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Performance limits of axial turbomachine stages
This thesis assesses the limits of stage efficiency for axial compressor and turbine stages. A stage model is developed, consisting of a specified geometry and a surface velocity distribution with turbulent boundary layers. The assumptions and parameterization of the stage geometry allow for …
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Understanding Performance Limits in Wireless Sensor Networks
Finally, we study the minimum energy required for transporting packets between two arbitrarily chosen source and destination in a random wireless network. We prove both an upper bound and a lower bound of the minimum transporting energy. We also show several results of network transport capacity …
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Performance limits of silicon solar cells due to structural defects
… analysis of the material properties and device performance of silicon solar cells containing structural defects. TCAD simulations across a wide range of defect concentrations and distributions are used to determine the material requirements for low-cost silicon containing structural defects to …
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Exploring Performance Limits of Wireless Networks with Advanced Communication Technologies
… of these new technologies on network throughput performance. Such investigation is critical not only for theoretical understanding, but also can be used as a guideline to design algorithms and network protocols in the field. The goal of this dissertation is to understand the impact of some …
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Distributed Estimation and Performance Limits in Resource-constrained Wireless Sensor Networks
… (FIM) at any given time step is maximized. The performance of the proposed compressive sensing based sensor management methodology in terms of accuracy of inference is investigated.</p> <p>For the Bayesian parameter estimation problem, a framework is proposed where quantized observations from …
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Inelastic web crushing performance limits of high-strength-concrete structural walls
… investigates the feasibility of defining new limits for a seldomly considered failure mode that could lead to more slender cross sections with the use of high-strength-concrete (HSC).The possibility of web crushing failure in shear dominated reinforced concrete element rises when the …
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Performance limits of linear variable reluctance motors in controlled linear motion applications
Improved actuator point-to-point positioning performance, as measured by settling time, has been demonstrated in the context of manufacturing automation applications such as circuit board assembly and other product-transfer operations. The control objective is to move a single mass in a single axis …
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Performance limits for colloidal quantum dot and emerging thin-film solar cells
… emerging thin-film PV technologies, focusing on performance limits for QD solar cells in the face of inefficient charge extraction and energetic disorder. First, we introduce material complexity as a framework for analyzing PV technologies and assess the performance and scalability of all leading …
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Performance limits and robustness issues in the control of flexible link manipulators
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Noise-Enhanced and Human Visual System-Driven Image Processing: Algorithms and Performance Limits
… as well as the method to estimate the performance limit of image segmentation algorithms are developed.</p> <p>Object detection in images is a fundamental problem whose goal is to make a decision if the object of interest is present or absent in a given image. We develop a framework and …
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Electro-Thermal Codesign in Liquid Cooled 3D ICs: Pushing the Power-Performance Limits
The performance improvement of today's computer systems is usually accompanied by increased chip power consumption and system temperature. Modern CPUs dissipate an average of 70-100W power while spatial and temporal power variations result in hotspots with even higher power density (up to …
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Performance Limits of Active Noise Control for Nonlinear Systems: A Machine Learning Perspective
… and comfort. This thesis investigates the performance limits of ANC systems in nonlinear dynamical systems, with a particular emphasis on automotive and headphone applications. Both feedback and feedforward ANC systems are considered, and their limitations are analysed from a machine …
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A closed-loop driver/vehicle directional dynamics predictor
… not only its directional stability and control limits, but also the control performance limits of the driver. In view of their lower stability limits, the directional dynamics of articulated freight vehicles have been extensively investigated assuming either negligible contributions due to …
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Capacity Analysis for Gaussian and Discrete Memoryless Interference Networks
… the impact of interference on communication performance as well as optimal ways to handle interference. From the theoretical point of view, we examine how interference affects the fundamental performance limits, and provide insights on how interference should be treated for various channel …
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Cryogenic operation of silicon-germanium heterojunction bipolar transistors and its relation to scaling and optimization
… cryogenic behavior also helps to investigate the performance limits of SiGe HBTs and provides essential information for further device scaling. Technology computer aided design (TCAD) and sophisticated on-wafer DC and RF measurements are essential in this research. Drift-diffusion (DD) theory is …
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Essays in Consumer Choice Driven Assortment Planning
… maximizing consumers, we establish fundamental limits on the performance of any assortment policy whose aim is to maximize long run revenues. In addition, we propose adaptive assortment policies that attain such performance limits. Our results highlight salient features of this dynamic …
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Flight performance testing of ethanol/100LL fuel blends during cruise flight.
… transition period. This thesis focused on engine performance associated with multiple engine power settings on a Cessna 152 /Lycoming O-235 airframe/power plant combination. Flight performance data was collected with an engine data monitor (EDM) augmented by flight crew observations. Results …
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