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654  Articles
In a power system, the analysis of transient signals is the theoretical basis of fault diagnosis and transient protection theory. Shannon wavelet entropy (SWE) and Shannon wavelet packet entropy (SWPE) are powerful mathematics tools for transient signal a... see more

The Campanian volcanism develops near the sea. Therefore, the geophysical study of the marine environment is a key to a better understanding of the tectonic evolution and the origin of volcanism in the area. An abundance of high quality seismic data in th... see more

En este trabajo se muestra que la utilización de filtros basados en la transformada wavelet discreta (DWT) mejora la sensibilidad de sistemas fotoacústicos para medición de gases traza bajo condiciones de relación señal a ruido (SNR) desfavorables. Para l... see more

El pronóstico de series de tiempo que exhiben una estructura de segundo orden que vara en función del tiempo ha recibido especial atención debido a la dificultad de obtener buenos pronósticos, especialmente cuando existe una estructura poco homogénea al f... see more

Fitur ekstraksi merupakan langkah penting dalam pengenalan karakter. Hasil dari keseluruhan sistem pengenalan karakter sangat tergantung pada keberhasilanya suatu sistem mengekstrak fitur-fitur tiap objek yang akan dikenali. Wavelet Transform dapat diguna... see more

In this work we use discrete wavelet transform for analyzes the frequency structure of EEG signal with evoked potentials after effect of stimulus. The method for determining the response time to a stimulus, based on the evaluation of the wavelet entropy a... see more

Diagnostic model for gas turbine elements based on wavelet spectral analysis method of vibration signals and S-discriminant is proposed in the work. The developed model could be used in construction of perspective control systems of aircraft engine units ... see more

Este documento analiza la estructura de correlación entre los índices accionarios representativos de Estados Unidos como el s&p500 y djia, así como de América Latina, como el ipc de México, ibovespa de Brasil y Merval de Argentina, para diferentes niveles... see more

This paper demonstrates an application of discrete wavelet transform as a feature extractor as applicable to natural language processing. The procedure discussed in this paper extracts important features of the printed characters of Gujarati and Amharic s... see more

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