Coastal freak waves are dangerous to people, ships and buildings in the coastal zone. Their mechanism thus is a very important issue. In this study, the data of around eight million waves collected by Harbor and Marine Technology Center in Taichung are analyzed. The statistical analysis shows that the occurrence probability of freak wave is lower than Rayleigh¡¦s distribution. The corresponding sea-state parameters show freak waves tend to occur more frequently when the nonlinearity are higher, the wave groupiness are higher, or the FFT spectrum from wave records are more narrow-banded. HHT analysis shows wave superposition and wave nonlinearity are both possible mechanisms. Freak waves propagating from a wave source are also simulated based on the linear dispersion relation. In half of the simulations, the maximum wave height decreases to only 70% of the original value.

Psicólogo / Autor No Autoriza la publicación de su tesis a texto completo en el Portal de Tesis Electrónicas de la Universidad de Chile / A través de la presente investigación, se propone comprender el Circo Freak Contemporáneo y su puesta en escena como la exhibición de corporalidades monstruosas o designadas como anormales desde las nociones que articulan y construyen la relación entre cuerpo y poder, que través de su configuración como escenario liminal, tiene la capacidad de transgredir la posición de seguridad de los espectadores. Esta investigación cualitativa ha sido desarrollada con un enfoque interpretativo, a través del método autoetnográfico y con técnicas de análisis visual. Tiene características de investigación liminal, en tanto transita por los bordes de las ciencias sociales, promoviendo una producción de conocimiento que funde la posición del investigador y lo investigado. Así, esta memoria da cuenta de un proceso investigativo que comienza con el investigador como espectador, y termina con él ejecutando un acto de suspensión corporal. Los resultados producidos apuntan a una puesta en escena en la que tanto las disposiciones espaciales y ambientales como la utilización de recursos como el dolor, perforación y sangrado configuran una experiencia liminal que tiene la capacidad de poner en tensión la norma sobre el cuerpo

Thesis (Ph. D.)--University of Washington, 2001. / Vita. Includes bibliographical references (leaves 233-244).

No description available.

A comprehensive experimental study was conducted to produce benchmark wave kinematics data for five different regular waves and the maxima of four different irregular wave trains. Two of the irregular waves generated are in the category of rogue waves. A series of experiments were conducted in a 2-D wave tank at Texas A&M University to measure wave velocities and accelerations using LDV and PIV systems. The wave crests of regular and rogue waves are the focus of this study. With the measured wave velocity field, the wave accelerations were computed using a centered finite difference scheme. Both local and convective components of the total accelerations are obtained from experimental data. Also, the nonlinear wave forces on a truncated slender cylinder are computed by applying the obtained wave kinematics to the Morison equation. The force results based on measured wave kinematics are compared with those based on the kinematics of linear extrapolation, Wheeler stretching, and modified stretching. The Wheeler stretching method generally underestimates the actual wave kinematics. The linear extrapolation method is very sensitive to the cutoff frequency of the wave spectrum. The modified stretching method tends to predict the maximum value of wave kinematics above the still water level (SWL) well except for the convective acceleration. The magnitude of convective acceleration in the regular waves was negligibly small, whereas the magnitudes of horizontal and vertical convective accelerations in the rogue wave were increased rapidly above the SWL.

Thesis (doctoral)--Ludwig-Maximilians-Universität München, 2003. / Includes bibliographical references.

Computer vision has been developed rapidly in the last few decades and it has been used in a variety of fields such as robotics, autonomous vehicles, traffic surveillance camera etc. nowadays. However, when we process these high-resolution raw materials from the cameras, it brings a heavy burden to the processors. Because of the physical architecture of the CPU, the pixels of the input image should be processed sequentially. So even if the computation capability of modern CPUs is increasing, it is still unable to make a decent performance in repeating one single work millions of times. The objective of this thesis is to give an alternative solution to speed up the execution time of processing images through integrating popular image recognition algorithms (SURF and FREAK) on GPUs with the help of CUDA platform developed by NVIDIA, to speed up the recognition time. The experiments were made to compare the performances between traditional CPU-only program and CUDA program, and the result show the algorithms running on CUDA platform have a significant speedup. / Thesis / Master of Applied Science (MASc)

Thesis (Ph. D.)--University of Chicago, Department of History, June 2000. / Includes bibliographical references. Also available on the Internet.

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No description available.