Wavelet Transforms
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. Projeto de novos sistemas-wavelet com aplicaÃÃes na anÃlise de sinais do sistema elÃtrico / Design of new wavelet systems with applications in power system signal analysis
The wavelet transform equipped with the multiresolution analysis has been offered as an efficient tool in the investigation of non stationary signals derived from a plenty of areas. The development of new âbasisâ so as to implement such techniques has the aim of enlarging the span of suitable choices for a particular purpose. This thesis introduces new fam
Publicado em: 2006
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14. The utilization of Wavelets transforms in the extraction of characteristics and patterns recognition in ECG signals / Utilização das transformadas Wavelets na extração de características e no reconhecimento de padrão em um sinal de ECG
Presently doctors and medical professionals are having the aid of support systems for diagnosis which include in their data base expertise knowledge, acquired mainly through empirical observation of heuristics applied to their diagnosis which translate partially, to the technical application used. In the systems which aid diagnosis, more specifically in elec
Publicado em: 2006
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15. ENHANCEMENT OF IMAGES IN THE TRANSFORM DOMAIN / REALCE DE IMAGENS NO DOMÍNIO DA TRANSFORMADA
This Dissertation is aimed at the development of new enhancement techniques applied in the transform domain. The study of the bidimensional transforms motivated the development of techniques based on these mathematical tools. The comparative analysis between the enhancement methods in the spatial domain and in the transform domain revealed the advantages of
Publicado em: 2006
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16. AproximaÃÃo espectral e construÃÃo de wavelets com aplicaÃÃes em eletrogastrografia / Spectrum approximation and wavelet design with applications in electrogastrography
Signal analysis is one of the most important areas of Signal Processing. This thesis is divided in three parts, each one addressing a specific topic of signal analysis. The sub-areas were: (i) approximate methods for spectrum evaluation; (ii) wavelet design; and (iii) biomedical signal analysis. The problem of spectrum estimation under constraints of minimal
Publicado em: 2005
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17. Um estudo sobre características do subdomínio inercial da turbulência desenvolvida em escoamento acima e dentro da copa da Floresta Amazônica de terra firme e acima do Pantanal Matogrossense / An study about statistical characteristics of inertial subrange of developed turbulence in flows above and below of Amazonia Forest canopy and above Pantanal Matogrossense
In this work turbulent data measured in two micrometeorologicaly different regions, sampled at 60 Hz, were used. The first data set was obtained at a tower in the Rebio-Jaru Reserve, during an intensive campaign of the Large Scale Biosphere Atmosphere Experiment in Amazonia - (LBA) in 1999. The second set was obtained in the Pantanal Matogrossense, Interdisc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/06/2002
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18. An study about statistical characteristics of inertial subrange of developed turbulence in flows above and below of Amazonia Forest canopy and above Pantanal Matogrossense / Um estudo sobre características do subdomínio inercial da turbulência desenvolvida em escoamento acima e dentro da copa da Floresta Amazônica de terra firme e acima do Pantanal Matogrossense
Neste trabalho foram utilizados dados turbulentos medidos em duas regiões micrometeorologicamente distintas, amostrados a uma frequência de 60 Hz. O primeiro conjunto de dados refere-se à torre da Reserva Rebio-Jaru, quando da realização da campanha intensiva do Experimento Científico de Grande Escala da Biosfera-Atmosfera na Amazônia - (LBA) em 1999.
Publicado em: 2002
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19. Um estudo sobre características do subdomínio inercial da turbulência desenvolvida em escoamento acima e dentro da copa da Floresta Amazônica de terra firme e acima do Pantanal Matogrossense / An study about statistical characteristics of inertial subrange of developed turbulence in flows above and below of Amazonia Forest canopy and above Pantanal Matogrossense
Neste trabalho foram utilizados dados turbulentos medidos em duas regiões micrometeorologicamente distintas, amostrados a uma frequência de 60 Hz. O primeiro conjunto de dados refere-se à torre da Reserva Rebio-Jaru, quando da realização da campanha intensiva do Experimento Científico de Grande Escala da Biosfera-Atmosfera na Amazônia - (LBA) em 1999.
Publicado em: 2002
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20. Estudo comparativo sobre filtragem de sinais instrumentais usando transformadas de Fourier e Wavelet
A comparative study of the Fourier (FT) and the wavelet transforms (WT) for instrumental signal denoising is presented. The basic principles of wavelet theory are described in a succinct and simplified manner. For illustration, FT and WT are used to filter UV-VIS and plasma emission spectra using MATLAB software for computation. Results show that FT and WT f
Química Nova. Publicado em: 2001-12
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21. MATHEMATICAL AND EXPERIMENTAL APPROACHES IN SHAPE-ADAPTATIVE VIDEO CODING / ABORDAGENS MATEMÁTICAS E EXPERIMENTAIS EM CODIFICAÇÃO DE VÍDEO ADAPTATIVA À FORMA
This thesis investigates shape adaptative coding of arbitrarily shaped segments. The texture and contour coding efficiency is discussed and solutions to tackle the associated problems are proposed. The presented methods are evaluated using standard image sequences. A mathematical approach for shape-adaptative transforms using linear operators is developed, f
Publicado em: 2000
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22. SUPRESSION GROUND ROLL BY EMPLOYING WAVALET / SUPRESSÃO DE RUÍDO DE ROLAMENTO SUPERFICIAL UTILIZANDO WAVELETS
Surface waves are a common source of unwanted noise in the seismic record. Ground roll can be defined as a group of events that contaminates seismic data and makes a high dip (low velocity) and high amplitude cone, this can dominate near-source on seismic records. Surface waves are such a problem in land seismic record acquisition that the design of acquisit
Publicado em: 1999
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23. Universality in the brain while listening to music.
The human brain, which is one of the most complex organic systems, involves billions of interacting physiological and chemical processes that give rise to experimentally observed neuroelectrical activity, which is called an electroencephalogram (EEG). The presence of non-stationarity and intermittency render standard available methods unsuitable for detectin