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Implementation of Falls Detection System Using 3-axial Accelerometer Sensor

3축 가속도 센서를 이용한 낙상 검출 시스템 구현

  • Jeon, Ah-Young (Department of Interdisciplinary program in Biomedical engineering, Pusan National University) ;
  • Yoo, Ju-Yeon (Department of Interdisciplinary program in Biomedical engineering, Pusan National University) ;
  • Park, Geun-Chul (Department of Interdisciplinary program in Biomedical engineering, Pusan National University) ;
  • Jeon, Gye-Rok (Department of Biomedical engineering, School of Medicine, Pusan National University)
  • 전아영 (부산대학교 대학원 의공학협동과정) ;
  • 유주연 (부산대학교 대학원 의공학협동과정) ;
  • 박근철 (부산대학교 대학원 의공학협동과정) ;
  • 전계록 (부산대학교 의학전문대학원 의공학교실)
  • Received : 2010.04.01
  • Accepted : 2010.05.13
  • Published : 2010.05.31

Abstract

In this study, the falls detection and direction classification system was implemented using 3-axial acceleration signal. The acceleration signals were acquired from the 3-axial accelerometer(MMA7260Q, Freescale, USA), and then transmitted to the computer through USB interface. The implemented system can detect falls using the newly proposed algorithm, and also classify the direction of falls using fuzzy classifier. The 6 subjects was selected for experiment and the accelerometer was attached on each subject's chest. Each subject walked in normal pace for 5 seconds, and then the fall down according to the four direction(front_fall, back_fall, left_fall and right_fall) during at least 2 second. The falls was easily detect using the newly proposed algorithm in this study. The acquired signals were analyzed after 1 second from generating falls. The fuzzy classifier was used to classify the direction of falls. The mean value of the falls detection rate was 94.79%. The classifier rate according to falls direction were 95.83% in case of front falls, 100% incase of back falls, 87.5% in case of left falls, and 95.83% in case of right falls.

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