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 12 of 12 for “"frequency decomposition"”.
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Some tools for event frequency decomposition and heterogeneous transfer line analysis
Thesis: M.S., Massachusetts Institute of Technology, Sloan School of Management, 1995
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Broadband Multilevel Fast Multipole Methods
… communication systems, optical systems, high-frequency circuits and so on. As a consequence, there is much interest in finding algorithms that make these simulations as computationally efficient as possible. One of the leading classes of algorithms consists of the so-called Fast Multipole …
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Bounds on the growth of high Sobolev norms of solutions to nonlinear Schrödinger equations
… gives a quantitative estimate on the low-to high frequency cascade which can occur due to the nonlinear evolution. In our work, we present two possible frequency decomposition methods which allow us to obtain polynomial bounds on the high Sobolev norms of the solutions to the equations we are …
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A time and frequency domain analysis of contrarian trading strategies/
This thesis applies time and frequency domain analyses to a high-frequency market making strategy to study the profitability of liquidity provision over multiple time horizons from 1964 to 2013. Using daily returns and inside quotes, we provide evidence that widening spreads on the NASDAQ National …
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Automated auscultation : using acoustic features to diagnose mitral valve prolapse
… We support our decision with a visual time-frequency decomposition of a patient's prototypical beat and relevant features. Of the 51 subjects in our test set, we report three false negatives and five false positives. We achieve 82% sensitivity while reducing the false-positive rate to 15%.
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Wavelet Scattering Transforms Applied to Whale Vocalisations
… transforms can provide an alternative time-frequency decomposition for use in signal detectors. Detectors typically utilise the short-time Fourier transform (STFT), for which the continuous wavelet transform (CWT) serves as a suitable alternative. As an additional contribution, we improve …
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Spectral analysis of high-frequency finance
… a set of spectral techniques, including a frequency-specific correlation and a frequency decomposition of trading strategy profits. Then, we demonstrate the application of these techniques in an empirical analysis of high-frequency dynamics over the years 1995-2014. Our results consist of …
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Sex-related differences in perception and discrimination of different speakers: An analysis of the auditory dorsal stream via EEG
… alpha/beta and alpha peaks, respectively. Time- frequency decomposition revealed no significant differences between male and female groups in any testing conditions. Within the male group, stronger mu activity was found in active discrimination conditions compared to passive listening in only the …
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Nonlinear dispersive equations with random initial data
… The proof is based upon Bourgain's high-low frequency decomposition and improved averaging effects for the free evolution of the randomized initial data. In the second part of this thesis, we consider the periodic defocusing cubic nonlinear Klein- Gordon equation in three dimensions in the …
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A study of stock market liquidity from 1973 to 2015
… price impact, turnover ratio, and trading frequency. We use the Center for Research in Security Prices (CRSP) and Trade and Quotes (TAQ) databases to acquire stock data across different time spans to perform analysis across different time horizons, including stock listing and de-listing …
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Airflow sensing with arrays of hydrogel supported artificial hair cells
… a spatial sensing strategy that involves mapping frequency content to stimulus location by "tuning" linear, three-unit arrays of AHCs. Individual AHC sensors characterization results demonstrate peak current outputs in the nanoamp range and measure flow velocities as high as 72 m/s. …
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Attributes and their potential to analyze and interpret 3D GPR data
… the centimeter trace accuracy required by high-frequency and/or three-dimensional (3D) GPR surveys. Having introduced this flexible high-precision surveying setup, I successfully demonstrated the application of attribute-based processing to GPR specific problems, which may differ significantly …