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용종제거용 스네어의 회전 제어력 향상을 위한 NiTi 코어드 와이어(cored-wire) 개발
김정한(J.H. Kim),김성웅(S.W. Kim),김복동(B.D. Kim),오윤석(Y.S. Oh) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
Transmission of the rotation at the proximal end to the distal tip in real time is very important in determining the operability of medical devices such as guide-wires, catheters, and endoscopic accessories. Conventional stainless steel wire cannot meet requirement issued from medical doctors. In present work, NiTi cored guide wire was developed for the application in polypectomy snare. NiTi wire was drawn down to have a diameter of 0.3 mm. Stainless steel wire with a diameter of 0.1mm was coiled two times around the NiTi wire. Frist, the stainless steel wire was coiled in clockwise direction. After finish the coiling completely, coiling was conducted again in counterclockwise direction. Through this coiling method, the developed NiTi cored wire could demonstrate very improved rotation tracking ability. The high maneuverability of the wire is expected to be widely used in medical sectors.
金貞漢(J.H.Kim),金尙國(S.K.Kim) 한국체육학회 1974 한국체육학회지 Vol.9 No.-
This study, the dynamic analysis in back handspring was investigated in order to give effective techniques to many gymnasts.I made six tumbling-players choose as an object of the study. Each players won from the first prize to the sixth price in the Gymnastic Championship series in autumn, 1973. Practically I had taken photographs at that time.1. LeverageBack handspring is a kind of leverage: bones, joints and muscles act function as a pair of the lever. We know that the distance between the Point of working and fulcrum is shorter than that between the point of carrying a burden and fulcrum.I have proved in this study that the working of "body-lever" is influenced by the working power and working speed.2. The power with feet that kick over the atmosphere are variable according to the body-weight, the height, and the angle of sitting posture in handspring.For example, (1) Mr. Kim O Cheul gives power as much as 2337.7 newton in standing jump in back handspring and 6996.2 newton in on time in continuous action.(2) Mr. Lee O Teak gives power as much as much as 2027.77 newton in standing jump in back handspring and 5712.04 newton in one time in continuous action.(3) Mr. Park O Kill gives power as much as 2002.95 newton in standing jump in back handspring and 5168.2 newton in one time in continuous action.(4) Mr. Shin O Soon gives power as much as 2128.81 newton in standing jump in back handspring and 5185 newton in one time in continuous action.(5) Mr. Choe O Ho gives power as much as 2128.81 newton in standing jump in back handspring and 5545.69 newton in one time in continuous action.(6) Mr. Lee O Yeoul gives power as much as 1986.19 newton in standing jump in back handspring and 4730.2 newton in one time in continuous action.By looking into the power that above six players give in back handspring, we can learn that the power in jumping successive handspring is much more powerful than in standing jump. Therefore, back handspring has been in often use as another event.In this study, back handspring shows us leverage.