Wavelets
Mostrando 1-12 de 214 artigos, teses e dissertações.
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1. Reasons behind declining of cases during the COVID-19 wavelets in Pakistan: public healthcare system or government smart lockdown policy?
Resumo As últimas estatísticas mostram que a COVID-19 ainda está muito ativa, e os casos estão aumentaando em vários países e regiões. Por outro lado, as estatísticas do Paquistão mostram uma tendência decrescente, em especial durante a primeira onda da pandemia de COVID-19. Para compreender esta tendência decrescente e responder à nossa pergunta
Ciência & Saúde Coletiva. Publicado em: 2022
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2. 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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3. Plasticity in the shape and growth pattern of asteriscus otolith of black prochilodus Prochilodus nigricans (Teleostei: Characiformes: Prochilodontidae) freshwater Neotropical migratory fish
RESUMO Medidas e funções wavelets dos otólitos asteriscus de curimatã, Prochilodus nigricans foram analisados para identificar a variação da forma e do incremento de crescimento dos indivíduos dos rios Solimões, Japurá e Negro da bacia Amazônica, Brasil. As análises morfométricas e morfológicas não revelaram evidências de segregação populaci
Neotrop. ichthyol.. Publicado em: 06/12/2018
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4. 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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5. 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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6. Matrix Damage Detection in Laminated Composite Structures by Discrete and Continuous Wavelet Transforms Using Vibration Modes
ABSTRACT: In this paper it was sought to enhance the potential damage detection, location and quantification of the Discrete and Continuous Wavelet Transforms in thin damaged laminated composite plates by a signal derived from vibration modes. To evaluate the ability of both transforms in the damage prognostic it was also proposed the use of Damage Indexes.
J. Aerosp. Technol. Manag.. Publicado em: 21/09/2017
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7. Influences of the signal border extension in the discrete wavelet transform in EEG spike detection
Abstract Introduction The discrete wavelet transform is used in many studies as signal preprocessor for EEG spike detection. An inherent process of this mathematical tool is the recursive wavelet convolution over the signal that is decomposed into detail and approximation coefficients. To perform these convolutions, firstly it is necessary to extend signal
Res. Biomed. Eng.. Publicado em: 12/09/2016
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8. 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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9. 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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10. Pulmonary crackle characterization: approaches in the use of discrete wavelet transform regarding border effect, mother-wavelet selection, and subband reduction
Introduction Crackles are discontinuous, non-stationary respiratory sounds and can be characterized by their duration and frequency. In the literature, many techniques of filtering, feature extraction, and classification were presented. Although the discrete wavelet transform (DWT) is a well-known tool in this area, issues like signal border extension, moth
Res. Biomed. Eng.. Publicado em: 2015-04
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11. Numerical calculations of Hölder exponents for the Weierstrass functions with (min, +)-wavelets
Lembrando que para todas as funções f : n → , as chamadas (min, +)-wavelets são construções do fecho inferior e superior, vindos da análise (min, +) [12, 13]. Mostr
TEMA (São Carlos). Publicado em: 2014-12
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12. 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