Examinando por Autor "Marín-Correa, J. M. (Juan Manuel)"

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  • Miniatura
    PublicaciónAcceso abierto
    SpeedMed: device for measuring velocity in track sports
    (2014-04-20) Sánchez-Aldana, N. (Natalia); Velásquez-Gómez, J. (Juliana); Villa-Bedoya, J. (Juliana); Marín-Correa, J. M. (Juan Manuel)
    Everyday, industries make use of economic resources to carry on research studies of products to improve the athletic performance of people. This is the main reason why it is believed that the development of an inexpensive and portable device capable of measuring times and speeds in track sports in general will provide useful information to study the performance of not only sportsmen, but also of ordinary people under stress situations allowing them to determine their weaknesses. In this project, two very simple sensors (photocells) are used to develop a device capable of measuring speed. A microcontroller was programmed to measure the time between the interruptions of two laser beams which lighten the surfaces of photocells, and it was also programmed to calculate velocity for a given distance. These values are sent to a Liquid Crystal Display (LCD) where they can be visualized and interpreted.
  • Miniatura
    PublicaciónAcceso abierto
    VirtualEar: Diseño y construcción de un audiómetro virtual
    (2014-04-20) Gallego-Ortiz, C. (Cristina); Ángel-Vélez, J. (Juliana); Zapata-Vanegas, C. (Catalina); Marín-Correa, J. M. (Juan Manuel)
    A virtual audiometer was developed using the virtual instrumentation platform Labview7.1. VirtualEar is a system that permits the evaluation of the audible capacity of a person, through an audiometric prove by air, with masking, to detect the crossed audition. The audiometry is done producing pure tones in the audible frequency’s range (125Hz-8000Hz) with pressure intensity that varies in a range from 0dB to 100dB. Masking consists on sending a white noise signal to the opposite ear of the one that is being tested. Both signals are emitted through two separate channels, and in that way, the threshold of minimum audible pressure is detected. VirtualEar also permits to generate and save the information in tables, graphics and reports. Furthermore, it’s possible to control each patient’s files and print the results.