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정낙영,최동훈,서일홍 대한기계학회 1994 대한기계학회논문집 Vol.18 No.8
A hierarchical planning strategy for dextrous manipulation of multifingered hands with soft finger contact model is proposed. Dextrous manipulation planning can be divided into a high-level stage which specifies the position/orientation trajectories of the fingertips on the object and a low-level stage which determines the contact forces and joint trajectories for the fingers. In the low-level stage, various nonlinear optimization problems are formulated according to the contact modes and integrated into a manipulation planning algorithm to find contact forces and joint velocities at each time step. Montana's contact equations are used for the high-level planning. Quasi-static simulation results are presented and illustrated by employing a three-fingered hand manipulating a sphere to demonstrate the validity of the proposed low-level planning strategy.
한국 청소년 여학생의 신체이미지 왜곡 실태와 영향요인- 제14차 청소년건강행태조사 이용 -
정낙영,계승희 한국식생활문화학회 2022 韓國食生活文化學會誌 Vol.37 No.3
This study was undertaken to examine body image distortion among female adolescents and identify related factors. Rawdata from the 14th Korean Youth Health Behavior Survey were used. The proportion of participants exhibiting body imagedistortion was 39.5%, with the ratio being higher among female students of normal weight as compared to underweightfemale students. Logistic regression revealed that the risk of having a distorted body image was higher among high schoolfemales than in middle school females having lower subjective academic performance and household economic status. Inaddition, the risk of having a distorted body image was higher for students who drank alcohol when compared to studentswho did not drink, for the group engaging vigorously in physical activity (exercise) more than three times per week asopposed to the group exercising less than three times per week, and for the group consuming less than one serving of fruitper day as compared to the group consuming more than one serving of fruit per day. Taken together, the results of this studyindicate that continuous nutrition education needs to be provided so that adolescents can correctly perceive their bodyimages and form desirable eating habits.