Search

Copyright of Revista Electrónica Redes de Ingeniería is the property of Universidad Distrital Francisco Jose de Caldas, Facultad de Ingenieria and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper presents the results obtained by applying some digital filtering strategies for characterizing noise in astronomical images captured from the astronomical observatory of the Universidad Tecnológica de Pereira. The algorithms used were implemented using the OpenCV library and Eclipse development environment on Ubuntu operating system. To the set images as sample, we found the value of the signal to noise ratio in order to determine the individual contributions of the dark current, pedestal noise and background interference, thereby obtaining SNR's ranging from 0,21 and 0,40, for mounting instruments with which account the observatory. [ABSTRACT FROM AUTHOR]

Copyright of Revista Electrónica Redes de Ingeniería is the property of Universidad Distrital Francisco Jose de Caldas, Facultad de Ingenieria and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This article presents the results obtained by performing the design and simulation of a system based on power line communication (PLC) using frequency hopping spread spectrum modulation (FHSS), in Simulink® tool for the integrated development environment Matlab®. It also shows the behavior of the bit error rate (BER) against external disturbances of different energy values for different simulation times, which can prove the linear behavior of the communications system. Finally, a spectral analysis is performed of the signals involved in the transmission, in order to verify the spread spectrum characteristic of the FHSS modulation. [ABSTRACT FROM AUTHOR]

Copyright of Revista de Logopedia, Foniatria y Audiologia (Grupo ARS XXI de Comunicacion, S.A.) is the property of Grupo ARS XXI de Comunicacion, S.A. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article presents a study which examines the various configurations of surface coil that is used in the RMI equipments. The researcher used signal to noise ratio as the basic parameter and verified using calculus method being utilized in finding the distribution of magnetic field that the intervening experimental map from onward obtained images in the Cuban tomography Giroimag 01 reproduces its spatial behavior.