3차원 모션 캡쳐 시스템과 IMU 센서 간 절대 오차율 비교를 통한 동적 균형 측정 시 IMU 센서 최적 위치 판별에 대한 연구 (A Study on the Determining the Optimal Location of IMU Sensors in Dynamic Balance Measurement by Comparing Absolute Percentage Error between the 3D Motion Capture System and IMU Sensor)

서지정보

· 발행기관 : 대한인간공학회
· 수록지 정보 : 대한인간공학회지 / 38권 / 6호 / 419 ~ 434페이지
· 저자명 : 고정배, 윤정식, 이창기, 변태민, 홍재수

초록

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.

영어초록

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.

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