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3차원 모션 캡쳐 시스템과 IMU 센서 간 절대 오차율 비교를 통한 동적 균형 측정 시 IMU 센서 최적 위치 판별에 대한 연구
고정배(Jeong Bae Ko),윤정식(Jeong Shick Yoon),이창기(Chang Ki Lee),변태민(Tae Min Byeon),홍재수(Jae Soo Hong) 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.6
Objective: Based on the 3D motion capture system, this study aims to determine the optimum position of IMU sensor used in dynamic balance evaluation. Background: Dynamic balancing ability refers to the ability to balance while maintaining the center of gravity while the body is moving. Low dynamic balancing capabilities increase the likelihood of falls. Recently, research on the dynamic balance of the body using the miniaturized IMU sensor is actively underway. However, the existing dynamic balance studies have different IMU sensor attachment locations, and the study comparing and evaluating the accuracy of the evaluation results according to the IMU sensor attachment location is few. Method: Timed Up and Go (TUG) evaluation was performed on six adults of different body sizes. The location of IMU sensors was selected from the literature survey by seven places (Sternum, L2, S2, Wrist and Shank) which are mainly used for dynamic balance assessment. The comparative analysis was performed by deriving the absolute error rate of the TUG evaluation between the 3D motion capture system and the 7 IMU sensors, the performance time of each stage of the TUG evaluation, walking speed, average walking time, and average walking time. Results: TUG evaluation overall performance time absolute percentage error was the lowest at 1.4% in the middle of the sternum. The absolute percentage error for performing sub-task of the TUG evaluation was similar to 7.9% and 7.5%, respectively, at the sternum and at the L2. The absolute percentage error of the mean walking speed was the lowest on L2 (4.6%). The mean step time absolute percentage error was similar to 2.7%, 2.8%, and 2.9%, respectively, in the trunk (Sternum, L2 and S2). The absolute percentage error of the mean stride time was the lowest at 1.7 percent at L2. Conclusion: The absolute percentage error tends to be relatively small when attaching an IMU sensor to the trunk (Sternum, L2 and S2) during dynamic balance evaluation in laboratory environments. Application: The results of this study can be used as a basic data for considering the location of IMU sensors in the study of dynamic balance based on IMU sensor.
고령자 실내 이승·이동 지원기기 개발을 위한 인체 치수 분석 연구
고정배(Jeong Bae Ko),김종현(Jong Hyun Kim),변태민(Tae Min Byeon),홍재수(Jae Soo Hong) 한국HCI학회 2020 한국HCI학회 학술대회 Vol.2020 No.2
본 연구는 인체 치수 분석을 통해 실내에서 고령자의 일상생활 중 이승과 이동을 지원해줄 수 있는 기기 개발을 위한 설계 가이드라인 도출을 목적으로 수행되었다. 한국인 인체 측정 데이터를 기반으로 실내 이승·이동 지원 기기 개발 시 필요한 주요 인체 측정 항목을 도출하고 주요 인체 측정 항목에 대한 데이터를 수집하였다. 이를 기반으로 실제 개발된 실내 이승·이동 지원기기의 설계 치수와 비교하여 개선 방향에 대해 제안하였다. 향후 본 연구에서 도출된 인체 치수 가이드라인을 적용한 실내 이승·이동 지원 기기에 대한 사용성 평가를 수행할 계획이다.