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강병문(Byungmun Kang),김대은(DaeEun Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 논문에서는 자기장 센서 기반으로 구성된 자기장 센싱 시스템을 이용하여 외부 자기장에 따른 위치 추정하기 위한 자기장 센서 보정 기법과 외부 자기 물체에 따른 자기장 변화를 이론적인 모델링을 소개한다. 자기장 센서의 정확한 보정 기법을 기반으로 외부 자기 물체의 위치에 따라 자기장 센서에 미치는 영향을 이론적으로 해석 할 수 있는 모델링을 통해서 자기장 센서 주변의 외부 자기 물체의 위치를 정확히 추정할 수 있다.
전형규(Hyung Gyu Jeon),정경환(Kyunghwan Jung),강병문(Byungmun Kang),김대은(DaeEun Kim),임윤묵(Yun Mook Lim),김광준(Kwang Joon Kim),김창오(Chang Oh Kim),이황재(Hwang-Jae Lee),김경록(Kyungrock Kim),김윤명(Yoon-Myung Kim) 대한운동학회 2022 아시아 운동학 학술지 Vol.24 No.4
OBJECTIVES The purpose of this study was to investigate the effects of assist and resistance torque on the spatiotemporal gait characteristics, and the symmetry and asymmetry of gait using a Gait Enhancing and Motivating System (GEMS) in the elderly. METHODS A cross-sectional and repeated measure design was used. A total of 18 participants (9 males, 9 females; age: 63.5 ± 5.02 years; mass: 64.26 ± 6.87 kg; height: 164.06 ± 7.15 cm) were recruited from a local community, and spatiotemporal gait data were collected with OptoGait system and GEMS. Spatiotemporal gait variables and differences between the dominant and non-dominant legs of these variables were assessed (step length, step time, stance phase, swing phase, single support, load response, pre swing phase, stride time, stride length, double support, cadence, and gait speed). The effects of three modes including normal, assist, and resist modes using GEMS were investigated twice for each participant on a 9-meter walkway. A one-way repeated measure analysis of variance followed by Bonferroni post-hoc tests was conducted. RESULTS The assist mode increased step time, swing phase, stride time and reduced stance phase, pre-swing phase, double support, cadence, and gait speed as compared to normal mode. The resist mode increased stance phase, load response, pre-swing phase, double support, cadence, and reduced step time, swing phase, and stride time. In dominant leg, assist mode showed increased step time and reduced pre-swing phase than normal mode, and greater step time than resist mode (p < 0.05). However, there was no effect of external torque on symmetry and asymmetry between both legs (p > 0.05). CONCLUSIONS The resistance and assist torque of GEMS alter spatiotemporal characteristics during the stance and swing phase of gait in the elderly. However, the resistance torque and assist torque of GEMS did not increase or decrease the gait asymmetry between the dominant and non-dominant legs.