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 779 for “"waveform"”.
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Machine learning methods modeling waveform, multi-parameter full waveform inversion, and uncertainty quantification
Full waveform inversion (FWI) is a potent technology capable of estimating subsurface parameters using seismic records. However, several challenges hinder its widespread application in large-scale field operations. In this thesis, I introduce strategies that leverage machine learning techniques to …
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Complex Waveform Phonetic Speech Synthesis
Made available in DSpace on 2014-12-10T19:07:23Z (GMT). No. of bitstreams: 1 7511692.pdf: 5802945 bytes, checksum: 48625785c12e8319a6404f2f0e422568 (MD5) Previous issue date: 1974
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Stored waveform adaptive motor control
This study investigates an adaptive control scheme designed to maintain accurate motor speed control in spite of high-frequency periodic variations in load torque, load inertia, and motor parameters. The controller adapts, stores and replays a schedule of torques to be delivered at discrete points …
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Characterizing vegetation structure using waveform LiDAR
… influence light and vegetation interaction. Waveform airborne LiDAR data contains large amounts of vegetation structural information, and is the best tool available for providing detailed physical information for large areas of vegetation. In this thesis, we first provide a complete work flow …
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Coding Theorems for Filtered-Waveform Channels
Made available in DSpace on 2014-12-11T18:23:41Z (GMT). No. of bitstreams: 1 7114879.pdf: 5669268 bytes, checksum: 796f12cbb8a31f3002269237b1da5d5a (MD5) Previous issue date: 1970
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Waveform methods for ordinary differential equations
… large dynamical systems is time consuming. Waveform method, an iterative technique for solving systems of differential equations, can be used to reduce the processing time. Waveform method has been shown to converge superlinearly on finite intervals. In this thesis, a measure of speed of …
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Airborne radar altimeter return waveform computations
… of the sensitivity of the average return waveforms to pointing errors is necessary. These waveforms are computed using a convolutional model, including the effects of asymmetric antenna patterns, which is representative of NASA’s Multimode Airborne Radar Altimeter. The necessary …
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Frequency Domain Ultrasound Waveform Tomography Breast Imaging
… of disease. Using the principles of full waveform inversion, high-resolution quantitative sound speed and attenuation maps of the breast can be created. In this thesis, we introduce some basic principles of imaging breast disease and the formalism of sound wave propagation. We present …
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ARTERIAL WAVEFORM MEASUREMENT USING A PIEZOELECTRIC SENSOR
… of the sensor at producing a reliable pulse waveform, a monitoring system, including the PZT sensor, ECG, pulse-oximeter, respiratory sensor, and accelerometer was setup. Signal analysis from the system helped discover that the PZT waveform is relative to the 1st derivative of the artery …
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Gate-level timing analysis and waveform evaluation
… output signals can be accurately modeled as ramp waveforms, are no longer satisfactory to meet the increasing demand of accuracy for new technologies. In this dissertation, we discuss several crucial issues that conventional STA has not taken into consideration, and propose new methods to handle …
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Non-orthogonal random waveform based multiuser communications
… a unified treatment of non-orthogonal random waveform based multiuser communications, commencing from the underlying theory and providing the way to sophisticated applications. In Chapter 2, we introduce the general framework of non-orthogonal random waveform based multiuser communications, …
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Born Waveform Inversion in Shot Coordinate Domain
The goal of this thesis is to integrate Born waveform inversion, variable projection algorithm and model extension concept to get a method that can improve the long scale background model updates reliably and efficiently from seismic data. Born waveform inversion is a partially linearized version …
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Toward the Optimal Waveform for Electrical Stimulation
… comfort and physiological responses to different waveforms, including Russian, interferential, sine, and square. Frequency remained constant at 30pps. The pulse width for the Russian waveform was 200ps, while the sine, square, and interferential waveforms used a lOOps pulse width. The amplitude of …
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Imaging the D" Structure using Waveform Modelling
… prior poor data coverage. Through forward waveform modelling, we observe a D'' discontinuity with varying depth and sharpness along a high velocity corridor from north to south beneath the Central Atlantic. Our results also provide evidence on the potential origin of the D'' discontinuity, …
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Imaging the D" Structure using Waveform Modelling
… prior poor data coverage. Through forward waveform modelling, we observe a D'' discontinuity with varying depth and sharpness along a high velocity corridor from north to south beneath the Central Atlantic. Our results also provide evidence on the potential origin of the D'' discontinuity, …
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High-energy sub-cycle optical waveform synthesizer
… physical processes ask for the capability of waveform shaping on sub-cycle time scales, which requires a fully phase-controlled multiple-octave-spanning spectrum. To date, no single laser source can support a bandwidth of more than an octave. Coherent synthesis of pulses with different …
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Optimized Harmonic Stepped-Waveform for Multilevel Inverter
… The concept of the Optimized Harmonic Stepped-Waveform (OHSW) technique for a multilevel inverter is presented. By applying this concept, specific harmonics can be eliminated, and the output voltage THD can be improved. A procedure to achieve the appropriate switching angles of the OHSW is …
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Resilient Waveform Design for OFDM-MIMO Communication Systems
… null space projected overlapped-MIMO radar waveform for spectrum sharing between radar and communications system. First, we consider OFDM systems under various jamming attacks. Previous research is focused on jamming OFDM data transmissions. We focus on energy efficient attacks that can …
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Automated seismic event location by waveform coherence analysis
… be retrieved by robust and linear approach of waveform comparison between stations within a network using seismic sources outside the network (chapter 2). To locate the seismic event, we scan the space of possible hypocentral locations and origin times, and stack the STA/LTA traces along the …
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