Wavelet Transform
Mostrando 1-12 de 158 artigos, teses e dissertações.
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1. A Novel Run-length based wavelet features for Screening Thyroid Nodule Malignancy
Abstract: Thyroid nodules are cell growths in the thyroid which might be for in one of two categories benign or malignant. Nodular thyroid disease is common and because of the associated risk of malignancy and hyper-function; these nodules have to be examined thoroughly. Hence diagnosing thyroid nodule malignancy in the early stage can mitigate the possibili
Braz. arch. biol. technol.. Publicado em: 25/11/2019
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2. Effects of small hydropower plants in cascade arrangement on the discharge cyclic patterns
RESUMO Por assumir que os impactos nos regimes naturais de vazão de Pequenas Centrais Hidrelétricas (PCHs) são desprezíveis, os licenciamentos ambientais para esses empreendimentos são relativamente fáceis de serem obtidos. Contudo, estudos recentes têm mostrado que a operação de PCHs pode afetar as condições naturais de escoamento especialmente q
RBRH. Publicado em: 18/07/2019
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3. Time-space characterization of droughts in the São Francisco river catchment using the Standard Precipitation Index and continuous wavelet transform
RESUMO Este artigo enfatiza a caracterização espaço-temporal de secas na bacia do rio São Francisco, com base na análise de ondaletas de séries temporais do Índice Padronizado de Precipitação (SPI). Para melhorar a estimação do SPI, os procedimentos para análise regional por momentos-L foram empregados na delimitação de regiões estatisticament
RBRH. Publicado em: 13/06/2019
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4. Análise da Relação entre a Precipitação Média do Reservatório Orós, Brasil - Ceará, e os índices PDO e AMO Através da Análise de Changepoints e Transformada de Ondeletas
Resumo Os riscos de extremos hidrológicos para um local ou região estão associados aos modos de variação do clima, em suas diversas escalas temporais. A compreensão da variabilidade de baixa frequência ganha uma elevada importância em regiões onde eventos de seca são frequentes, por estar associada a longos períodos de secas consecutivas. O presen
Rev. bras. meteorol.. Publicado em: 30/05/2019
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5. 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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6. Topoclimate in Morlet, Cross and Coherence Wavelet Analyses in the Brazilian Cerrado
ABSTRACT In recent years, the Traditional Morlet Transform, Cross and Wavelet Coherence have been used as techniques to analyze time series from meteorological and climatic data, obtaining useful information. These techniques were used to study air temperature and relative air humidity, air pressure and wind variables from 2015 to 2017. The data was collect
Floresta Ambient.. Publicado em: 13/09/2018
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7. Real-time premature ventricular contractions detection based on Redundant Discrete Wavelet Transform
Abstract Introduction Premature Ventricular Contraction (PVC) is among the most common types of ventricular cardiac arrhythmia. However, it only poses danger if the person suffers from a heart disease, such as heart failure. Hence, this is an important factor to consider in heart disease people. This paper presents an ECG real-time analysis system for PVC
Res. Biomed. Eng.. Publicado em: 26/07/2018
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8. Nondestructive ultrasonic testing in rod structure with a novel numerical Laplace based wavelet finite element method
Abstract Rod structure has been widely used in aerospace engineering and civil engineering. Nondestructive testing is a very important method applied to detect unseen flaws in structures, ultrasonic wave nondestructive testing has been used in many areas. Finite Element Method is one of the most widely used numerical methods but would have a high cost when d
Lat. Am. j. solids struct.. Publicado em: 16/07/2018
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9. 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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10. A wavelet-based method for power-line interference removal in ECG signals
Abstract Introduction The analysis of electrocardiogram (ECG) signals allows the experts to diagnosis several cardiac disorders. However, the accuracy of such diagnostic depends on the signals quality. In this paper it is proposed a simple method for power-line interference (PLI) removal based on the wavelet decomposition, without the use of thresholding t
Res. Biomed. Eng.. Publicado em: 2018-01
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11. 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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12. Continuous wavelet transform methods for the simultaneous determinations and dissolution profiles of valsartan and hydrochlorothiazide in tablets
ABSTRACT Continuous wavelet transform (CWT) was proposed for the simultaneous determination and dissolution profiles of valsartan (VAL) and hydrochlorothiazide (HCT) in tablets, without the use of a chemical separation procedure. The CWT approach was applied to the original UV spectra and their ratio spectra in the optimal wavelength ranges. After testing se
Braz. J. Pharm. Sci.. Publicado em: 20/04/2017