<span>La Telemedicina hace posible realizar de forma remota, varios procedimientos médicos y clínicos como: exámenes, diagnósticos y supervisión de tratamientos, utilizando recursos tele informáticos como computadores, servidores, equipos de procesamiento de imágenes, Internet y equipos de transmisión y recepción de información. La transmisión de la información de los pacientes crece día con día, vinculando otra serie de problemas relacionados con el tráfico y seguridad de los datos. En el tema de la seguridad, aún existe divergencia en los criterios de almacenamiento, acceso y transmisión de información de los pacientes porque los requerimientos físicos y lógicos varían para cada empresa, equipo desarrollador o intereses particulares. El presente trabajo hace un análisis respecto del tema de la seguridad informática sobre una red de Telemedicina. Incluye un análisis sobre los procedimientos de los servicios de Telemedicina más característicos y sus requerimientos de seguridad. Los requerimientos fueron estudiados y seleccionados a partir de los estándares internacionales regulatorios que se adapten a las necesidades básicas de seguridad de los servicios de Telemedicina.</span>
Este artículo presenta un análisis de uso de canales y la medición de ocupación espectral sobre la banda GSM-850 para el enlace downlink mediante dos escenarios de medición; Se definió un sector de Bogotá, Zona norte, sobre el cual se trazó una trayectoria de sensado; identificando parámetros como BSIC, NCC, LAI, MNC, LAC, CI, canal BCCH, frecuencia Uplink, nivel de potencia entre otros; a través del equipo Qualipoc. Se evidenció una cobertura con 17 celdas a lo largo del recorrido de 2.96 Km, con reconexión en dos de las celdas identificadas, resaltando la modulación GMSK como predominante y niveles de potencia aceptables para las estaciones móviles según la norma 3GPP GSM05.05. Posteriormente se realizó la captura del espectrograma en esta misma banda identificando la convivencia de diferentes tecnologías de telefonía móvil y el uso de GSM en varios canales de frecuencias y espacios temporales, con ocupación espectral del 95.2%
This article comparatively shows the evolution of parameters of three types of arrays for MIMO microstrip antennas, to which the number of ports is gradually incremented until reaching 32. The three arrays have a 1 × 2 configuration in each port and present different geometry or type of coupling in the next way: square patch with quarter-wave coupling (Antenna I), square patch with inset feed (Antenna II) and circular patch with quarter-wave coupling (Antenna III). The arrays were designed and simulated to operate on the millimetric wave band, specifically in the 60 GHz frequency to be used in wireless technologies such as IEEE 802.11 ad. A method of rapid prototyping was formulated to increase the number of elements in the array obtaining dimensions and coordinates of location in the layout in short periods of time. The simulation was conducted through ADS software, and the results of gain, directivity, return loss, bandwidth, beamwidth, and efficiency were evaluated. In terms of array results of 32 ports, Antenna III obtained the lowest return loss with −42.988 dB, being more than 19 dB lower than the others. The highest gain is also obtained by Antenna III with 24.541 dBi and an efficiency of 66%. Antenna II obtained better efficiency, reaching 71.03%, but with a gain of more than 2dB below the Antenna III. Antenna I obtained the best bandwidth.
This article presents a radar testbed for speed detection through micro-doppler effect in a controlled environment using software defined radio (SDR) technology. The target moves along a conveyor belt with software-controlled speed. The speed is detected by an SDR radar, and it is possible to compare it to an encoder-based sensor implemented on the testbed. The testbed as well as the SDR radar are reconfigurable and a (continuous wave) CW radar was implemented for the validation of the testbed; however, the testbed is not limited to this implementation. The testbed can be remotely operated because it includes the mechanism to move the target and control its velocity. The article shows the way in which the testbed was designed and implemented, the generation and processing of the radar signal using a limeSDR, and the validation of the radar measurements compared to the encoder-based speed sensor. The maximum speed obtained by the target in the testbed is 15.69cm/s. Results show a difference in the speed measured with the SDRadar of no more than 5% compared to the sensor measurememt. Results obtained allow characterizing the behavior of the SDR platform in the detection of low speeds.
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