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.
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Showing 1 to 20 of 67 for “"Performance limitations"”.
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Performance limitations of vibratory gyroscopes.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1965. Sc.D.
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Performance limitations and design considerations for FDNR implemented filters.
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1978.
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An Investigation of Performance Limitations in Active Noise Reduction Headsets
Closed-loop performance of an active noise reduction (ANR) headset is limited by phase lag. Speaker dynamics, control hardware, and acoustic wave propagation from the control speaker to the error microphone all contribute to this phase lag. Understanding these sources of phase lag and their …
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Phase Shift Control: Application and Performance Limitations With Respect to Thermoacoustic Instabilities
… employed but often does not provide good performance in that controller induced secondary instabilities are generated with increasing loop gain. This thesis investigates the general underlying cause of the secondary instabilities and shows that high average group delay through the …
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Numerical Investigation of Scaling Effects of a Ramjet-Powered Projectile
… this effort is to numerically characterize the performance of a miniature hydrogen-fueled and ethylene-fueled ramjet flowpath during Mach 3 and Mach 3.5 sea-level flight. The effect of geometric scale on ramjet performance is evaluated using high-fidelity RANS CFD models. Sensitivity to …
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Routing and Transport Layer Protocols for Wireless Networks
We study the performance limitations of TCP's (Transmission Control Protocol) congestion control mechanism on Wide Area Wireless Networks (WWANs) and also on ad hoc networks. We identify the properties of typical WWANs based on studies on the CDPD (Cellular Digital Packet Data) network, simulate …
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Design optimization of articulated vehicles with autonomous steering control
… using Monte-Carlo method to evaluate the performance limitations of AV dynamics. For enhancing the performance of the selfsteering AV, the design synthesis is formulated as a bi-layer design optimization problem. Particle Swarm Optimization (PSO) and Differential Evolution (DE) are …
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Using an empirical model of human turning motion to aid heading estimation in a personal navigation system
… navigation systems as well as current IMU performance limitations, the gyroscopes used to determine heading exhibit significant drift limiting the performance of the navigation system. In this thesis biomechanical signals are used to predict the onset of pedestrian turning motion. …
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ParaView: Performance debugging through visualization of shared data
Performance debugging is the process of isolating and correcting performance problems in an otherwise correct parallel program. Problems not immediately visible to the parallel programmer often lead to poor application performance. This thesis describes the design, implementation, and use of …
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Standalone Antenna Demonstration System
… includes rotational axes to illustrate antenna performance limitations and requirements. It provides a visual indication of wireless signal strength and demonstrates several antenna performance characteristics including polarization, gain and directivity, radiation patterns - nulls and maximums, …
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Investigating the Impact of Specific, Global, and Social Comparison Feedback on Safety Behaviors
… of work-related injuries. Improvements in safety performance have been demonstrated in numerous settings following behavior-based (BB) safety feedback. The relative impact of global, specific, and social comparison BB feedback on safety behaviors was assessed in the current study. A 2 Feedback …
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Point-Spread Function Assessment of SG-DBR Based Swept Source for OCT Imaging
… to specify the requirements to obtain a given performance. </p> <p> Next, experimental tests are performed on a JDS Uniphase C-band SG-DBR laser to assess its performance limitations. Finally, by comparing theory and experiment, recommendations are made on acceptable systematic and random noise …
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Modeling and control of undesirable dynamics in atomic force microscopes
… a major impact on image quality and feedback performance. Further, compensation for scanner creep was experimentally tested yielding a reduction in creep by a factor of 3 to 4 from the uncompensated system. Moreover, fundamental performance limitations in the AFM feedback system were …
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Characterization of tellurium back contact layer for CdTe thin film devices
… the back contact being a main source of CdTe performance limitations. Tellurium (Te) applied as a back contact has led to significant increases in fill factor and an overall progress in device efficiency. Devices deposited with Te show significant improvement in uniformity, even without …
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Numerical and experimental analysis of circularly polarized radiating line antennas
… arrays are given. The relative merits and performance limitations of elevated ANSERLIN elements, one-arm spirals, and two-arm spirals are discussed. The two-arm spiral appears to be the most suitable of these elements for use in a moderate bandwidth corporate-fed array. Finally, techniques …
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Vision-based Proprioceptive and Force Sensing for Soft Robotic Actuator
… However, current soft robotic sensors pose many performance limitations, and available materials and manufacturing techniques complicate the design of sensorized soft robots. To address these needs, we introduce a vision-based method to sensorize robust, electrically-driven soft robotic actuators …
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Microarchitectural Level Power Analysis And Optimization In Single Chip Parallel Computers
… into Deep Submicron (DSM) feature sizes, high-performance power-efficient computer architectures that keep pace with improving technologies need to be explored. Technology scaling increases the effects of wire latencies, inductive effects, noise and crosstalk in on-chip communication, limiting …
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Facial hacking: the twisted logic of electro-facial choreography
… External facial control transgresses the neural performance limitations and enables us to think about facial movement from a digital computational choreographic paradigm. 2) A facial language, the Language of Facial E-motion, that allows systematic computational exploration of possible facial …
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