Journal of rehabilitation welfare engineering & assistive technology (재활복지공학회논문지)

Rehabilitation Engineering And Assistive Technology Society of Korea (한국재활복지공학회)
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A Study on Gait Imbalance Estimation System using 3-axis Accelerometer

3축 가속도 센서를 이용한 보행 불균형 평가 시스템에 관한 연구

  • Received : 2015.01.14
  • Accepted : 2015.02.28
  • Published : 2015.02.28
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Abstract

In this paper, an efficient system using 3-axis accelerometer is proposed to diagnose the gait imbalance. The proposed hardware system consists of two 3-axis accelerometers to measure 3 directional acceleration of ankles and an embedded system to transfer the data. The acquired data were normalized and then compared to analyze the symmetry between normal and abnormal gait with ROCC (ratio of correlation coefficient). 10 healthy subjects were participated and each subject repeated the experiment 5 times. To make unbalanced ambulation, the height of the heel of one foot was changed during experiments. From the results, it is verified that ROCC index grew apart from the reference according to growing imbalance and the proposed system could be available for estimation of gait imbalance.

본 논문에서는 3축 가속도 센서를 이용하여 보행 불균형을 진단하는 효율적 시스템을 제안한다. 제안된 하드웨어 시스템은 주로 보행시 발목 세 방향의 가속도를 무선으로 측정할 수 있는 3축 가속도 센서와 데이터 전송을 위한 임베디드 시스템으로 구성되어 있다. 획득된 데이터를 정규화 처리한 후, ROCC (ratio of correlation coefficient)를 이용하여 정상적인 보행의 대칭성과 비정상적인 보행의 대칭성을 비교 분석하였다. 건강한 성인 10명을 대상으로 실험을 실시하였고 개인당 총 5회 반복 실험을 하였다. 비정상 보행을 만들기 위해 한쪽 발의 굽의 높이를 변화시켰다. 결과를 보면 보행 불균형이 커질수록 ROCC의 값이 점차 기준에서 멀어지는 것을 알 수 있었으며 제안된 시스템이 보행 불균형 평가에 사용가능한 것이 확인되었다.

Keywords

References

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