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지면효과를 받는 NACA0012 익형주위 유동장의 실험적 연구
조정현,김윤제,Cho, J.-H.,Kim, Youn J. 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.2
Experimental and numerical studies are conducted to investigate the flow field over a NACA0012 airfoil with ground effects. In experiment, the ground is simulated by a moving belt system. From the comparison between the experimental and numerical results, it is concluded that the velocity gradient over the ground plane causes the increments in pressure coefficient on lower surface of the airfoil and reduces the suction peak at the leading edge.
비폐쇄성 무정자증 환자에서 난자내 원형정세포 주입에 의한 임신 및 분만 1례
조정현,심현남,서주태,이동률,윤현수,백혜란,노성일,Cho, J.H.,Shim, H.N.,Seo, J.T.,Lee, D.R.,Yoon, H.S.,Paik, H.R.,Roh, S.I. 대한생식의학회 1996 Clinical and Experimental Reproductive Medicine Vol.23 No.3
Normal fertilization and pregnancy by round spermatid was achieved from nonobstructive azoospermia patient to be believed untreatable. Therefore, it is suggested that application of round spermatid in human ART program seems to be new treatment of male infertility. Also, it will be needed further research for evaluated fertilization mechanism by round spermatid injection.
[안전/타이어운동특성부문] 무부하 상태하 회전하는 타이어의 내부유동 특성 고찰
조정현(J.H.Cho),김윤제(Youn J. Kim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Experimental investigations were presented to determine the flow characteristics inside a rolling pneumatic tire driven under unloaded condition. A hot-wire anemometer was used to measure the flow velocity inside the tire cavity. Experimental system was designed to acquire and process the velocity signals in real time. It is observed that the magnitude of mean velocity in the cavity air shows increasing natures with the increasing of the inflation pressures and rolling speeds. In addition, the increasing rate of velocity for the change of pressure is increased as the tire rolls faster. The experiments were insufficient to determine the exact flow structure inside the tire. The result shows, however, that viscous force and inertia force play important roles in constructing the flow structure inside the rolling tire.