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2회선 1도약 줄넘기 동작에 대한 숙련자와 비숙련자간의 운동역학적 비교 분석
전기수(Jeon, Ki-soo),정익수(Jeong, Ik-Soo),이진(Lee, Jin) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.5
This study examined kinematics variables of body segment at double-under skipping rope by three dimensional image analysis as well as comparative study on ground reaction force to give sports players new information and to provide instructors with basic and scientific material that was needed to teach double-under skipping rope. The subject was six experts and six novices. Experts group took longer time to complete skipping rope than novices group did. And, novices group had larger front and rear inclination at each phase. The author investigated joint of both upper extremity (shoulder joint, elbow joint and wrist joint) and lower extremity (hip joint, knee joint and ankle joint) to investigate body segments exactly, and estimated not only movement displacement of body center but also maximum value of vertical axis (Fz). The study is likely to help promote skipping rope that has been recently popular, and to provide sportsmen and/or players of skipping rope with quantitative data.
광학입자센서 내 유동장과 측정영역이 측정효율에 미치는 영향
김영길(Young-Gil Kim),전기수(Ki-Soo Jeon),김태성(Tae-Sung Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The OPS (Optical Particle Sensor) using light scattering from the particles (real-time measurement without physical contact to the particles) can be used for cleanroom or atmospheric enviro㎚ent monitoring. For particles smaller than 300 ㎚, the detection efficiency becomes lower as scattered light decreases with particle size. To obtain higher detection efficiency with small particles, the flow field in particle chamber and the detection volume should be designed optimally to achieve maximum scattered light from the particles. In this study, a commercial computational fluid dynamics software FLUENT was used to simulate the gas flow field and particle trajectories with various optical chamber designs for 300 ㎚ PSL particle. For estimation of laser viewing volume, we used a commercial computational optical design program ZEMAX. The results will be a great help in the development of OPS which can measure small particles with higher detection efficiency.