Дисертації з теми "Fourier transformations"
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Schardt, Michael [Verfasser]. "Statisches Einzelspiegel-Fourier-Transformations-Infrarotspektrometer / Michael Schardt." Aachen : Shaker, 2018. http://d-nb.info/1162794135/34.
Shenoy, Pranab Johnson Jeremy. "Universal FFT core generator/." Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/2535.
Yeung, Clifford Po Shek Carleton University Dissertation Engineering Electrical. "A cascadeable pipelined fast Fourier transform switch with built-in self-test." Ottawa, 1992.
Yu, Sungwook. "VLSI implementation of multidimensional discrete Fourier transform and discrete cosine transform /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
Weber, Stefan. "Fourier-Transformations-Infrarotspektroskopie an seltenen Erd-Hydriden und Manganaten." Aachen Shaker, 2009. http://d-nb.info/994464428/04.
Wu, Si Fan. "Speech analysis by AFD." Thesis, University of Macau, 2012. http://umaclib3.umac.mo/record=b2592945.
Salomão, Luiz Roberto [UNESP]. "Estimativa do expoente de Hurst, por meio da transformada Wavelet, de séries temporais de precipitação de chuvas das regiões climáticas do estado de São Paulo no período de 1978 a 1997." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/91934.
Este trabalho pode ser separado em duas partes. Na primeira apresentamos, de forma resumida, a natureza fractal das séries de precipitação de chuvas, a estimativa do expoente de Hurst (H), a transformada wavelet, o seu uso na estimativa de H e a comprovação, por meio de testes com séries de movimento browniano fracionário geradas com H estabelecido a priori, que temos um bom método para estimar H com a transformada wavelet. Na segunda parte é feita uma análise das séries temporais de precipitação de chuvas (séries de chuva). As séries de chuvas foram obtidas junto ao Departamento de Águas e Energia Elétrica (DAEE) do estado de São Paulo e são constituídas de medições diárias, em milímetros, da quantidade de chuva em postos meteorológicos distribuídos em todo o estado. Algumas séries apresentam ausências de medições que acabam transformando uma série longa em duas ou mais séries menores. Em função disso foi estabelecido um procedimento que permite aproveitar essas séries com ausências (dias sem medições) para estimar o expoente de Hurst. A partir de considerações climáticas o estado foi dividido em nove regiões. Foram selecionadas séries com 20 anos de registros de chuva (de janeiro de 1978 a dezembro de 1997). Dos valores de H encontrados foi feita uma média para cada região climática do estado de São Paulo.
This work can be separated into two parts. In the first part is briefly presented the fractal nature of the rain precipitation series, the estimate of the Hurst exponent (H), the wavelet transform, its use in the estimate of H and the evidence, by tests with generated series of fractional brownian motion with H established a priori, that we have a good method to estimate H with wavelet transform. In the second part an analysis of rain precipitation series is made. The rain series had been obtained from the Departmento de Águas e Energia Elétrica (DAEE) of the state of São Paulo and contain daily measurements, in milimeters, of the amount of rain in distributed meteorological stations all over the state. Some series present absences of measurements, transforming a long series into two or more lesser series. A procedure was established, allowing to use these series with absences (days with no measurements) to estimate the Hurst exponent. From climatic considerations the state was divided into nine regions. The regions with rain data over a period of 20 years have been selected as rain series (from january 1978 to december 1997). From the several values of H, we computed an averaged value of H for each climatic regions of the state of São Paulo.
Maheswaran, Arulnesan. "A new Hilbert time warping principle for pattern matching /." Title page, contents and abstract only, 1985. http://web4.library.adelaide.edu.au/theses/09PH/09phm214.pdf.
Salomão, Luiz Roberto. "Estimativa do expoente de Hurst, por meio da transformada Wavelet, de séries temporais de precipitação de chuvas das regiões climáticas do estado de São Paulo no período de 1978 a 1997 /." Rio Claro : [s.n.], 2006. http://hdl.handle.net/11449/91934.
Banca: Hari Mohan Gupta
Banca: Roberto Nicolau Onody
Resumo: Este trabalho pode ser separado em duas partes. Na primeira apresentamos, de forma resumida, a natureza fractal das séries de precipitação de chuvas, a estimativa do expoente de Hurst (H), a transformada wavelet, o seu uso na estimativa de H e a comprovação, por meio de testes com séries de movimento browniano fracionário geradas com H estabelecido a priori, que temos um bom método para estimar H com a transformada wavelet. Na segunda parte é feita uma análise das séries temporais de precipitação de chuvas (séries de chuva). As séries de chuvas foram obtidas junto ao Departamento de Águas e Energia Elétrica (DAEE) do estado de São Paulo e são constituídas de medições diárias, em milímetros, da quantidade de chuva em postos meteorológicos distribuídos em todo o estado. Algumas séries apresentam ausências de medições que acabam transformando uma série longa em duas ou mais séries menores. Em função disso foi estabelecido um procedimento que permite aproveitar essas séries com ausências (dias sem medições) para estimar o expoente de Hurst. A partir de considerações climáticas o estado foi dividido em nove regiões. Foram selecionadas séries com 20 anos de registros de chuva (de janeiro de 1978 a dezembro de 1997). Dos valores de H encontrados foi feita uma média para cada região climática do estado de São Paulo.
Abstract: This work can be separated into two parts. In the first part is briefly presented the fractal nature of the rain precipitation series, the estimate of the Hurst exponent (H), the wavelet transform, its use in the estimate of H and the evidence, by tests with generated series of fractional brownian motion with H established a priori, that we have a good method to estimate H with wavelet transform. In the second part an analysis of rain precipitation series is made. The rain series had been obtained from the Departmento de Águas e Energia Elétrica (DAEE) of the state of São Paulo and contain daily measurements, in milimeters, of the amount of rain in distributed meteorological stations all over the state. Some series present absences of measurements, transforming a long series into two or more lesser series. A procedure was established, allowing to use these series with absences (days with no measurements) to estimate the Hurst exponent. From climatic considerations the state was divided into nine regions. The regions with rain data over a period of 20 years have been selected as rain series (from january 1978 to december 1997). From the several values of H, we computed an averaged value of H for each climatic regions of the state of São Paulo.
Mestre
Stickler, Daniel [Verfasser]. "Abbildung von magnetischen Mikrostrukturen mittels Fourier-Transformations-Holografie / Daniel Stickler." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2010. http://d-nb.info/1236927419/34.
Mekarnia, Djamel. "Imagerie différentielle infrarouge à sélectivité spectrale de Fourier." Nice, 1986. http://www.theses.fr/1986NICE4001.
Pan, Ruimin Reeves Stanley J. "Efficient image restoration algorithms for near-circulant systems." Auburn, Ala., 2007. http://repo.lib.auburn.edu/Send%2011-10-07/PAN_RUIMIN_55.pdf.
Yaskin, Vladyslav. "Applications of the fourier transform to convex geometry." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4464.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (March 1, 2007) Vita. Includes bibliographical references.
Saesor, Yaowaluk. "Quelques contributions aux problèmes inverses de synthèse de Fourier." Montpellier 2, 2007. http://www.theses.fr/2007MON20155.
Mai, Wei Xiong. "Time frequency distribution associated with adaptive Fourier decomposition and its variation." Thesis, University of Macau, 2012. http://umaclib3.umac.mo/record=b2590643.
Weber, Stefan [Verfasser]. "Fourier-Transformations-Infrarotspektroskopie an Seltenen Erd-Hydriden und Manganaten / Stefan Weber." Aachen : Shaker, 2009. http://d-nb.info/115651777X/34.
Boisly, Martin. "Modellierung des Materialverhaltens Magnetorheologischer Fluide unter Verwendung der Fourier-Transformations Rheologie." Doctoral thesis, Logos Verlag Berlin GmbH, 2017. https://tud.qucosa.de/id/qucosa%3A32282.
Palmer, Joseph McRae. "The Hybrid Architecture Parallel Fast Fourier Transform (HAPFFT) /." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd855.pdf.
Letellier, Emmanuel. "Transformation de Fourier des fonctions invariantes sur une algèbre de Lie finie." Paris 6, 2003. http://www.theses.fr/2003PA066191.
Hutchison, Luke A. D. "Fast registration of tabular document images using the Fourier-Mellin Transform /." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd404.pdf.
Chen, Long. "Optimizing the Fast Fourier Transform on a many-core architecture." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 66 p, 2008. http://proquest.umi.com/pqdweb?did=1459924761&sid=28&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Breimyer, Paul. "The Fast Fourier Transform in the MPEG encoding algorithm." Diss., Connect to the thesis, 2001. http://hdl.handle.net/10066/1488.
Khosravi, Mehrdad. "PSEUDOQUOTIENTS: CONSTRUCTION, APPLICATIONS, AND THEIR FOURIER TRANSFORM." Doctoral diss., Orlando, Fla. : University of Central Florida, 2008. http://purl.fcla.edu/fcla/etd/CFE0002186.
Letellier, Emmanuel. "Fourier transforms of invariant functions on finite reductive Lie algebras /." Berlin [u.a.] : Springer, 2005. http://www.loc.gov/catdir/toc/fy0715/2004115717.html.
Groß, Ralf [Verfasser]. "Untersuchung photochemischer Radikalreaktionen in Lösung mit zeitaufgelöster Fourier-Transformations-EPR / Ralf Groß." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2002. http://d-nb.info/1001559126/34.
Wong, Ming Lai. "Q-Fourier transform, q-Heisenberg algebra and quantum group actions /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?MATH%202003%20WONG.
Milar, Kendall. "Fast Fourier transform analysis of oboes, oboe reeds and oboists : what matters most to timbre." South Hadley, Mass. : [s.n.], 2008. http://ada.mtholyoke.edu/setr/websrc/pdfs/www/2008/257.pdf.
Charfi, Maher. "Auto-focalisation par transformations orthogonales : automatisation d'un système de mesure de la longueur de fissure sur un faciès de rupture." Metz, 1992. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1992/Charfi.Maher.SMZ9231.pdf.
The different steps for obtaining industrial images are presented. Usual light conditions are discussed. We deal with subpixel measurement technics, wich improve the measurement accuracy by further processing image data. After a brief overview of the usual auto-focusing technics, new procedures using orthogonal transforms are presented and their ability to characterize various morphologies are studied. By comparing the two proposed transformations and the structure of their computing algorithms, provisional conclusions are proposed. The implementation of autofocusing camera technics in metrology systems is dealt with in the third chapter, and the set of the parameters determining the accuracy measurement is studied. In the last chapter, an automatic vision system for the automatic measurement in Crack Opening Displacement (COD) test is proposed. The system uses the ability of the orthogonal transforms studied to recognize a texture. Hardware and software devices are presented ; the different steps of the processing procedure are exposed
Allix, Olivier. "Modélisation du comportement des composites stratifiés : application à l'analyse du délaminage." Paris 6, 1989. http://www.theses.fr/1989PA066011.
N'da, Ettien Yves-Fernand. "Théorème de Paley-Wiener suivant le dual unitaire d'un groupe compact." Doctoral thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/66449.
Demange, Bruno. "Principes d'incertitude associés à des formes quadratiques non dégénérées." Orléans, 2004. http://www.theses.fr/2004ORLE2069.
Lourenço, Júnior Edgard [UNESP]. "Transformada de Fourier: teoria como base para aplicações em mecânica celeste." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/123156.
O objetivo principal deste trabalho é mostrar a importância da Teoria da Transformada de Fourier Discreta como ferramenta nas análises de dados obtidos de simulações numéricas com modelos de Sistemas Dinâmicos em Mecânica Celeste. Mostraremos as principais motivações e justi cativas presentes no desenvolvimento das Transformada de Fourier contínua, discreta, e de algoritmos computacionais para Fast Fourier Transform. Esse desenvolvimento será aplicado na dinâmica de rotação de satélites naturais
The main objective of this work is to show the importance of Discrete Fourier Transformation as a tool in the analyses of data obtained from numerical simulations of Dynamical Systems models in Celestial Mechanics. We will show the main motivations and justi- cations presented in development of continuous and discrete Fourier Transform, and computational algorithms to Fast Fourier Transform. We will apply these theoretical development in dynamics of rotation of naturals satellites
Lourenço, Júnior Edgard. "Transformada de Fourier : teoria como base para aplicações em mecânica celeste /." Rio Claro, 2014. http://hdl.handle.net/11449/123156.
Banca: Ernesto Vieira Neto
Banca: Marta Cilene Gadotti
Resumo: O objetivo principal deste trabalho é mostrar a importância da Teoria da Transformada de Fourier Discreta como ferramenta nas análises de dados obtidos de simulações numéricas com modelos de Sistemas Dinâmicos em Mecânica Celeste. Mostraremos as principais motivações e justi cativas presentes no desenvolvimento das Transformada de Fourier contínua, discreta, e de algoritmos computacionais para Fast Fourier Transform. Esse desenvolvimento será aplicado na dinâmica de rotação de satélites naturais
Abstract: The main objective of this work is to show the importance of Discrete Fourier Transformation as a tool in the analyses of data obtained from numerical simulations of Dynamical Systems models in Celestial Mechanics. We will show the main motivations and justi- cations presented in development of continuous and discrete Fourier Transform, and computational algorithms to Fast Fourier Transform. We will apply these theoretical development in dynamics of rotation of naturals satellites
Mestre
Xue, Liping. "Efficient mapping of fast Fourier transform on the Cyclops-64 multithreaded architecture." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 88 p, 2007. http://proquest.umi.com/pqdweb?did=1397913041&sid=16&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Camarda, Florent. "Développement d'une architecture reconfigurable pour transformée de Fourier rapide." Rennes, INSA, 2012. http://www.theses.fr/2012ISAR0036.
This manuscript deals with the implementation of a reconfigurable Fast Fourier Transform architecture. The architecture is suitable for almost all the digital communication systems h using OFDM modulation. The first chapter starts with a reminder of the OFDM signal theories for which an Inverse Discrete Fourier Transform (lOFT) is required on the transmitter side as well as a Direct Discrete Fourier Transform (DFT) on the receiver side. This operation involves one of the greatest complexities of hardware implementation so that its optimization has a great importance. This chapter also presents the multiple ways in which the DFT and its inverse can be used in advanced OFDM modulations and demodulations. The goal of the second chapter is to explore the different ways of implementing the FFT. First, some general principles of the digital architectures are presented as well as the reconfiguration possibilities. Then, several FFT architectures are compared and classified depending on the way the operation is computed and whether the architecture is reconfigurable or not. The third chapter presents two algorithms of Fast Fourier Transform (FFT) which are computable via the proposed architecture. After a quick presentation and classification of the main different FFT algorithms, both the Radix algorithm and the Winograd Fourier Transform Algorithm (WFTA) are studied in depth. This study leads to the possibility of a clever combination of these two algorithms allowing then to compute a larger group of FFT sizes. Chapter four presents the proposed architecture, which is the major contribution of this PhD thesis. This architecture involves three main elements: the reconfigurable butterfly, the twiddle factors computation and data storage in memories. Two configurations of the architecture are proposed. The first allows high throughput for the results of the operation while the second one is optimized in resources use and power consumption. A control architecture for the computation units is also presented. The following chapter introduces the issue of number representations in hardware descriptions. The two most important data representation forms (fixed point and floating point) are presented. As the fixed-point representation is retained in order to reduce the hardware complexity, a study presents the impact of the imperfect representation of real values. Results are given in order to choose the best compromises between the computing precision and the resources needs. These results are given in terms of Signal to Quantization Noise Ratio for several given data widths. The last chapter provides results of the implementation of the architecture for the Digital Terrestrial Television Broadcasting (DTIB) application. Lt first evokes the main features of the three DTIB standards that are considered (DVB, DMB and ISDB). Then the implementations parameters are presented for the two configurations presented in the fourth chapter. Results are then given in terms of resources use for many data widths as well as for time performances. A general conclusion sums up all the results and lists all the advantages and drawbacks of the proposed architecture. Some perspectives are given in order to lead to many optimizations as well as an implementation on an Application Specifie lntegrated Circuit (ASIC) target
Legrand, Louis. "Application de la transformation de Hartley au traitement d'images numériques." Nancy 1, 1989. http://www.theses.fr/1989NAN10472.
Fadina, Tolulope Rhoda. "Fourier methods for pricing early-exercise options under levy dynamics." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71860.
ENGLISH ABSTRACT: The pricing of plain vanilla options, including early exercise options, such as Bermudan and American options, forms the basis for the calibration of financial models. As such, it is important to be able to price these options quickly and accurately. Empirical studies suggest that asset dynamics have jump components which can be modelled by exponential Lévy processes. As such models often have characteristic functions available in closed form, it is possible to use Fourier transform methods, and particularly, the Fast Fourier Transform, to price such options efficiently. In this dissertation we investigate and implement four such methods, dubbed the Carr- Madan method, the convolution method, the COS method and the Fourier spacetime stepping method. We begin by pricing European options using these Fourier methods in the Black-Scholes, Variance Gamma and Normal Inverse Gaussian models. Thereafter, we investigate the pricing of Bermudan and American options in the Black-Scholes and Variance Gamma models. Throughout, we compare the four Fourier pricing methods for accuracy and computational efficiency.
AFRIKAANSE OPSOMMING: Die prysbepaling van gewone vanilla opsies, insluitende opsies wat vroeg uitgeoefen kan word, soos Bermuda-en Amerikaanse opsies, is grondliggend vir die kalibrering van finansiële modelle. Dit is daarom belangrik dat die pryse van sulke opsies vinnig en akkuraat bepaal kan word. Empiriese studies toon aan dat batebewegings sprongkomponente besit, wat gemodelleer kan word met behulp van exponensiëele Lévyprosesse. Aangesien hierdie modelle dikwels karakteristieke funksies het wat beskikbaar is in geslote vorm, is dit moontlik om Fourier-transform metodes, en in besonders die vinnige Fourier-transform, te gebruik om opsiepryse doeltreffend te bepaal. In hierdie proefskrif ondersoek en implementeer ons vier sulke metodes, genaamd die Carr-Madan metode, die konvolusiemetode, die COS-metode en die Fourier ruimte-tydstap metode. Ons begin deur die pryse van Europese opsies in die Black-Scholes, Gammavariansie (Engels: Variance gamma) en Normaal Invers Gauss (Engels: Normal Inverse Gaussian)-modelle te bepaal met behulp van die vier Fourier-metodes. Daarna ondersoek ons die prysbepaling van Bermuda-en Amerikaanse opsies in die Black-Scholes en Gammavariansiemodelle. Deurlopend vergelyk ons die vier Fourier-metodes vir akkuraatheid en berekeningsdoeltreffendheid.
Sitter, David Norbert. "Space invariant modeling in three-dimensional optical image formation." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/13450.
Nadir, Bouchaïd. "Opérateurs para différentiels et régularité dans les problèmes aux limites elliptiques non linéaires." Nice, 1985. http://www.theses.fr/1985NICE4025.
Betser, Michaël. "Modélisation sinusoïdale et applications à l’indexation sonore." Paris, ENST, 2008. http://pastel.archives-ouvertes.fr/pastel-00004089/fr/.
The goal of the thesis is the analysis of audio signals using sinusoidal modeling. The first part of the thesis deals with the estimation of the sinusoidal parameters, and in particular with the methods based on the Fourier Transform. The advantages of this family of methods are a low algorithmic complexity and an ease of use. A complete state of the art of these methods is presented. Then, we describe the new estimators which have been developped during the thesis. In particular, we present two original methods allowing to estimate all the parameters of a sinusoid modulated both in amplitude and frequency. Their performances are shown to be better than the only quivalent method in the litterature, namely the quadratically interpolated fast Fourier transform (QIFFT). Audio indexing is a large domain whose purpose is to answer the needs for content access in the audio documents. In the second part of the thesis, we applied the sinusoidal modeling to two audio indexing tasks for which this modeling is particularly appropriate: pitch estimation and sound object detection. The two algorithms developped involve similar ideas: a matching of the sinusoidal peaks estimated in the audio stream with those of the reference sound object, and a likelihood measure of the matching
Al, Jaabari Mohamed El Mokhtar. "Opérateurs différentiels quasi-invariants et représentation exceptionnelle de SL3(R)." Poitiers, 1993. http://www.theses.fr/1993POIT2273.
Dupré, Jean-Christophe. "Traitement et analyse d'images pour la mesure de grandeurs cinématiques, déplacements et déformations à partir de la granularité laser et de réseaux croises, et pour l'étude de couplages thermomécaniques." Poitiers, 1992. http://www.theses.fr/1992POIT2262.
Basmaji, Riad. "Etude des réseaux géodésiques réguliers : matrice de covariance des réseaux réguliers finis de type nivellement : application de la méthode de la transformée de Fourier à l'analyse : application de la méthode de la transformée de Fourier à l'analyse des réseaux réguliers infinis à une et deux variables." Observatoire de Paris, 1989. https://tel.archives-ouvertes.fr/tel-01958574.
Halaq, Hanan. "Interférométrie holographique numérique en temps réel." Strasbourg, 2010. http://www.theses.fr/2010STRA6008.
Kearney, John R. "A unique instrumentation system design for measuring forces on a rotating shaft." abstract and full text PDF (free order & download UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1453646.
Lolla, Rama Krishna. "Fast Fourier Transform implementation using Field Programmable Gate Array technology for Orthogonal Frequency Division Multiplexing systems." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE0000563.
Larkin, Kieran Gerard. "Topics in multi-dimensional signal demodulation." Connect to full text, 2000. http://hdl.handle.net/2123/367.
Title from title screen (viewed Apr. 23, 2008). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Physics, Faculty of Science. Includes bibliography. Also available in print form.
Buse, Oliver [Verfasser]. "Entwicklung eines statischen low-cost Fourier-Transformations-Spektrometers für den sichtbaren Wellenlängenbereich / Oliver Buse." Aachen : Shaker, 2010. http://d-nb.info/1081887281/34.
Lee, Yim Kul. "Nonlinear image processing and pattern analysis by rotating kernel transformation and optical fourier transform." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/14717.
Blagosklonov, Oleg. "Applications de transformations linéaires en cardiologie nucléaire." Besançon, 2002. http://www.theses.fr/2002BESA3009.