Wavelets Analysis
Mostrando 1-12 de 85 artigos, teses e dissertações.
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1. Optical Fiber Coupler Analysis Using Daubechies Wavelets
Abstract This article presents the theoretical analysis of a signal coupling between a proposed Photonic Crystal Fiber (PCF) and a Conventional Fiber with Step Index (CFSI) system. In this analysis, the Finite Element Method (FEM) and Beam Propagation Method (BPM) are applied together with Daubechies wavelets as basis function and described in the mathematic
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-09
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2. Wavelet-domain elastic net for clustering on genomes strains
Abstract We propose to evaluate genome similarity by combining discrete non-decimated wavelet transform (NDWT) and elastic net. The wavelets represent a signal with levels of detail, that is, hidden components are detected by means of the decomposition of this signal, where each level provides a different characteristic. The main feature of the elastic net i
Genet. Mol. Biol.. Publicado em: 29/11/2018
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3. Non-decimated Wavelet Transform for a Shift-invariant Analysis
RESUMO Devido sua habilidade de localização tempo-frequência, a Transformada wavelet tem sido aplicada em várias áreas de pesquisa envolvendo análise e processamento de dados, frequentemente substituindo a convencional Transformada de Fourier. A TransformadaWavelet Discreta tem um grande potencial de aplicação¸ destacando-se como uma importante ferr
TEMA (São Carlos). Publicado em: 2018-01
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4. Multi-fractal Analysis for Riemann Serie and Mandelbrot Binomial Measure with (min,+)-Wavelets
RESUMO Em primeiro lugar, introduz-se os chamados (min, +)-wavelets que são limitantes inferior e superior construídos para análise (min, +), utilizados em análise multi-fractal.Em segundo lugar, esta análise é aplicada a funções tais como série de Riemann e medida binomial de Mandelbrot, para o cálculo numérico do espectro de singularidades, e co
TEMA (São Carlos). Publicado em: 2016-08
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5. Multiscale Analysis of GPS Time Series from Non-decimated Wavelet to Investigate the Effects of Ionospheric Scintillation
Devido às inúmeras possibilidades de aplicação, a teoria de wavelets tem sido utilizada nas mais diversas áreas de pesquisa. A Transformada Wavelet Discreta é a versão mais conhecida. Porém, o processo de decimação necessário para seu cálculo, faz com que ela seja sensível à origem, o que para algumas aplicações não é o ideal, principalment
TEMA (São Carlos). Publicado em: 2015-08
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6. Optimum dynamic analysis of 2D frames using free-scaled wavelet functions
This paper presents a wavelet-based scheme for dynamic analysis of 2-dimensional (2D) frames. In the proposed approach, free-scaled wavelet functions are developed for Multi-Degrees-of-Freedom (MDOF) structures, particularly, complex Chebyshev and simple Haar wavelets are implemented. A simple step-by-step and explicit algorithm is presented to calculate the
Lat. Am. j. solids struct.. Publicado em: 2014-11
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7. Damage identification from uniform load surface using continuous and stationary wavelet transforms
Derived from flexibility matrix, Uniform Load Surface (ULS) is used to identify damages in beam-type structures. This method is beneficial in terms of more participating the lower order modes and having less prone to noise and irregularities in the measured data in comparison with the original flexibility matrix technique. Therefore, these characteristics ma
Lat. Am. j. solids struct.. Publicado em: 2014-10
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8. A wavelets-based analysis of the phillips curve hypothesis for the Brazilian economy, 1980-2011
Este artigo desenvolve uma análise da hipótese da curva de Phillips — de acordo com a formulação de Phelps-Friedman — para a economia brasileira dos últimos 30 anos através da metodologia de ondaletas. Uma introdução às ideias fundamentais do argumento de Phillips é seguida por uma breve exposição dos principais desenvolvimentos teóricos no
Econ. Apl.. Publicado em: 2013-03
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9. Cutting force response in milling of Inconel: analysis by wavelet and Hilbert-Huang Transforms
We study the milling process of Inconel. By continuously increasing the cutting depth we follow the system response and appearance of oscillations of larger amplitude. The cutting force amplitude and frequency analysis has been done by means of wavelets and Hilbert-Huang transform. We report that in our system the force oscillations are closely related to th
Lat. Am. j. solids struct.. Publicado em: 2013-01
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10. Detecção e classificação de arritmias em eletrocardiogramas usando transformadas wavelets, máquinas de vetores de suporte e rede Bayesiana
The cardiopathies are currently, according the Ministério da Saúde, the second biggest cause of mortality among the Brazilians, behind only the brain vascular diseases. The motivation for the work here presented is the identification and classification of cardiopathies registered in Electrocardiogram exams, ECG, such as premature contractions, branches blo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2012
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11. Inertial Measurement Unit Calibration Procedure for a Redundant Tetrahedral Gyro Configuration with Wavelet Denoising
Abstract: The aim of this paper was to present a calibration procedure applied to an inertial measurement unit composed of a triad of accelerometers and four gyros in a tetrad configuration. The procedure has taken into account a technique based on least-square methods and wavelet denoising to perform the best estimate of the sensor axis misalignments. The w
J. Aerosp. Technol. Manag.. Publicado em: 2012-06
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12. Processamento de sinais de descargas parciais em tempo real com base em wavelets e seleção de coeficientes adaptativa espacialmente
On-line partial discharge (PD) analysis is a highly pursued feature due to the economy related to scheduled shutdowns, disassembling and transport. Nevertheless, on-site PD measurements are frequently limited by interferences found in high-voltage facilities, a situation that imposes the continued development of PD signal processing methods. In the last year
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/11/2011