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박정홍(Jung Hong Park),손권(Kwon Son),서국웅(Kuk Woong Seo),박영훈(Young Hoon Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
To quantify irregular body motions the time series analysis was applied to the gait study. The motions obtained from gait experiment are complex to exhibit nonlinear behaviors. The purpose of this study is to measure quantitatively the characteristics of the major six joints of the body during walking. The gait experiments were carried out for eighteen young males walking on a motor driven treadmill. Joint motions were captured using eight video cameras, and then three dimensional kinematics of the neck and the upper and lower extremities were computed by KWON 3D motion analysis software. The largest Lyapunov exponent was calculated from the time series to quantify stabilities of each joint. The results provides a data set of nonlinear dynamic characteristics for six joints engaged in normal walking.
외발서기를 통한 정적균형능력 평가 시 압력중심점 변인의 적정 샘플링 시간에 관한 연구
염창홍 ( Chang Hong Youm ),박영훈 ( Young Hoon Park ),서국웅 ( Kuk Woong Seo ) 대한무용학회 2007 대한무용학회논문집 Vol.50 No.-
The purpose of this study was to investigate of the proper sampling time on center of pressure variables while executing a single-leg stance with eyes open and eyes closed through 3D video analysis and GRF system. The subjects participated in this study were 12 female yoga group and 8 female control group. The conclusions are as follows: 10~20s was appropriate for the sampling time during a single-leg stance with eyes open and 20~30s was appropriate for the sampling time during single-leg stance with eyes closed. The effect of the visual information block was revealed as the sampling time difference between single-leg stance with eyes open and eyes closed. The study found out that difference of sampling time between single-leg stance with eyes open and eyes closed because the visual information was blocked. This study suggests to analyze the dynamic and static phase separately during the static balance measurement and needs additional study which requires to subdivide sampling time in detail.
보행에서 남성과 여성에 대한 주요 관절 운동의 통계학적 분석
김민경(Min Kyoung Kim),박정홍(Jung Hong Park),손권(Kwon Son),서국웅(Kuk Woong Seo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Statistical differences between men and women are investigated for a total of eleven joint motions during level walking. Human locomotion which exhibits nonlinear dynamical behaviors is quantified by the chaos analysis. Time series of joint motions was obtained from gait experiments with ten young males and ten young females. Body motions were captured using eight video cameras, and the corresponding angular displacements of the neck and the upper body and lower extremity were computed by motion analysis software. The maximal Lyapunov exponents for eleven joints were calculated from attractors constructed and then were analyzed statistically by one-way ANOVA test to find any difference between the genders. This study shows that sexual differences in joint motions were statistically significant at the shoulder, knee and hip joints.