Results 1 to 10 of about 84,950 (295)

Improved anomaly diagnosis of production facilities by combining Autoencoder with spectral characteristics

open access: yesNihon Kikai Gakkai ronbunshu
In a previous study, we had proposed a method for detecting abnormalities using an Autoencoder. It considers the amplitude value of each frequency spectrum while performing the FFT analysis of time-series data.
Fuki SAKA   +5 more
doaj   +1 more source

Electroencephalogram (EEG) Alpha Power as a Marker of Visuospatial Attention Orienting and Suppression in Normoxia and Hypoxia. An Exploratory Study

open access: yesBrain Sciences, 2020
While electroencephalogram (EEG) alpha desynchronization has been related to anticipatory orienting of visuospatial attention, an increase in alpha power has been associated to its inhibition.
Alberto Zani   +2 more
doaj   +1 more source

Power spectral analysis of occipital area during eyes-closed and eyes-open

open access: yesLiberabit
Background: Power spectral analysis of the occipital cortex is essential for characterizing brain activity during attentional and relaxed states. Objectives: This study aims to develop a predictive model capable of distinguishing between eyes-closed (EC)
Adolfo González-González   +3 more
doaj   +1 more source

ANÁLISIS ESPECTRAL PARA EL RECONOCIMIENTO DE HUELLAS ACÚSTICAS

open access: yesRevista de Investigaciones Universidad del Quindío, 2016
Este artículo presenta los resultados del proceso de reconocimiento de huellas digitales acústicas utilizando características espectrales de la señal.
Eduardo E. Zurek   +6 more
doaj   +1 more source

A simplification to the fast FIR-FFT filtering technique in the DSP interpolation process for band-limited signals

open access: yesRevista Facultad de Ingeniería Universidad de Antioquia, 2013
En ocasiones cuando se manipula una gran cantidad de datos muestreados, se requiere reducir dicha cantidad para conservar solo una representación de estos. Aquí dos aspectos son importantes; por un lado no se quiere que la cantidad de datos sea demasiado
Francisco Rubén Castillo Soria   +3 more
doaj  

Real-Time Detection of Power Quality Disturbance Using Fast Fourier Transform and Adaptive Neuro-Fuzzy Inference System

open access: yesJurnal Rekayasa Elektrika
Power quality disturbances cause equipment damage or financial losses. Therefore, the electric power system needs to identify and distinguish any power quality disturbances to reduce problems.
Ahmad Alvi Syahrin   +6 more
doaj   +1 more source

Caracterización mediante HRTEM de un acero AISI4140 nitrurado por postdescarga micro-ondas

open access: yesRevista de Metalurgia, 2005
Un análisis de las fases de nitruros formados en un acero AISI 4140, nitrurado mediante condiciones de postdescarga micro-ondas, se llevó a cabo por microscopía electrónica de transmisión de alta resolución (HRTEM), rápida transformada de Fourier (FFT) y
L. Béjar-Gómez   +3 more
doaj   +1 more source

PERBANDINGAN HASIL EKSPERIMEN SUPERPOSISI GELOMBANG BUNYI BONANG BARUNG SECARA SIMULTAN DAN MIXING BERBANTUAN AUDACITY DAN MATLAB

open access: yesSpektra: Jurnal Fisika dan Aplikasinya, 2017
Abstrak Bonang dapat dimainkan secara simultan dari dua nada yang sama dengan satu oktaf terpisah, sehingga muncul fenomena superposisi. Untuk mengamati perbedaan dalam waveform dan spektrum superposisi untuk berbagai warna suara bonang barung ...
Lusi Widayanti, Yudhiakto Pramudya
doaj   +1 more source

Reconocimiento de Huellas Dactilares Usando Características Locales

open access: yesRevista Facultad de Ingeniería Universidad de Antioquia, 2008
El reconocimiento de huellas dactilares es uno de los métodos más populares usados con mayor grado de éxito para la identificación de personas. La huella dactilar tiene características únicas llamadas minucias, las cuales son puntos donde los bordes ...
Gualberto Aguilar   +4 more
doaj  

Implementing FFTs in Practice

open access: yesCoRR
This review article was first published in 2008 as chapter 11 in the book "Fast Fourier Transforms," edited by C. S. Burrus, for the Connexions project at Rice University, which is sadly no longer online. It gives a high-level overview of some of the engineering considerations that arise in high-performance implementations of fast Fourier trasnforms ...
Steven G. Johnson, Matteo Frigo
openaire   +2 more sources

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