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이기성(K.S. Lee),정효기(H.K. Jung),김종봉(J.B. Kim),김종호(J.H. Kim) 한국소성가공학회 2010 금형가공 심포지엄 Vol.2010 No.11
Meso-scale or micro-scale forming of sheet metal parts has been recently considered as one of the important forming technologies with growing demand on meso/micro products for electric or medical devices. Experimental investigation on the cylindrical meso-cup drawing with hemispherical punch is carried out to examine the limit drawing ratio and thickness distribution of drawn cups. The working parameters chosen in this study are blank diameter, die-corner radius and blankholding force. It was found from experiments that the limit drawing ratio of 2.4 can be achieved in case of hemispherical cup drawing and the thickness distribution can be more widely uniformed as compared with the results of conventional cup drawing.
고감도 압저항 외팔보 센서를 이용한 Liposome의 검침
현석정 ( S. J. Hyun ),김현석 ( H. S. Kim ),김용준 ( Y. J. Kim ),정효일 ( H. I. Jung ) 한국센서학회 2005 센서학회지 Vol.14 No.3
N/A Liposomes are microscopic spherical vesicles that form when lipids are hydrated and have been widely used for biochemical assay, drug delivery and molecular imaging. In particular, they are well known for artificial cell membranes to study cellular functions such as cell fusions and membrane proteins. Here, we firstly report the detection of liposomes by the highly sensitive microfabricated piezoresistive cantilever sensor chip and the phosphatidylserine recognition protein C2A which is chemically immobilized on the sensor surface. The signal created from the bending motion of piezoresistive cantilever after the liposome attachment has been monitored in real time.
생체내 미소의료기기에 대한 Biotribology 기초연구
김영태(Y. T. Kim),권은영(E. Y. Kwon),정효일(H. I. Jung),김대은(D. E. Kim) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
There is a need for fundamental understanding of biotribological characteristics of various biomaterials sliding against biological materials in order to develop a moving mechanism of medical microsystems having high energy efficiency. A special experimental equipment was designed and built to study the frictional behavior of various biomaterials sliding against a small intestine specimen of a pig. Friction experiments for six biomaterials were performed. Particularly, the effects of load and speed on frictional behavior were investigated. The results of this work will aid in the development of the actuator for a self-propelling micro-endoscope.