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주행속도와 제동력의 변화에 의한 디스크 브레이크의 스퀼 소음에 미치는 영향
김정훈(J. H. Kim),김경훈(K. H. Kim),최명진(M. J. Choi) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Brake noise is classified according to frequency territory: judder, groan and squeal. Squeal noise of disk brake is a noise and self excited vibration with frequency of 1~10Khz caused by the friction force between the disk and the pad of the automobile. Passengers in a vehicle feel uncomfortable. It causes unstable characteristic to the brake system when you try to stop the vehicle. Thus this study aims to find in which conditions the vehicles are stable during the braking hour and find ways to decrease a squeal noise and the vibration by measuring various factors including squeal noise and self excited vibration between the pad and disk brake system during the braking hour. From the result the countermeasure for a squeal noise and a vibration decrease is established. Also the analyzed data is found to be useful and can be applied to the actual brake model.
남윤성,김남근,최명진,박상희,정기화,이숙환,윤태기,차광열,Nam, Y.S.,Kim, N.K.,Choi, M.J.,Park, S.H.,Chung, K.W.,Lee, S.H.,Yoon, T.K.,Cha, K.Y. 대한생식의학회 1998 Clinical and Experimental Reproductive Medicine Vol.25 No.3
Premature ovarian failure is a condition causing amenorrhea, hypoestrogenism, and elevated gonadotropins in women younger than 40 years. Many causes of premature ovarian failure were reported, including genetic abnormalities, enzymatic defects, defects in gonadotropin secretion or action, autoimmune disorders, physical and idiopathic causes. Recently, Finnish group reported a point mutation in the follicle stimulating hormone (FSH) receptor gene in premature ovarian failure patients. But it was reported that the group from United States could not find any mutation in FSH receptor gene. So we analysed C566T point mutation of FSH receptor gene using restriction fragment length polymorphism (RFLP) and compared the result between premature ovarian failure patient with idiopathic and known causes. But we did not find 556C${\rightarrow}$T mutation in the FSH receptor gene in both groups. These findings suggest that the missense mutation in the human FSH receptor gene reported in Finnish women with premature ovarian failure is uncommon in Korean women with premature ovarian failure.
심동혁(D. H. SHIM),최명진(M. J. Choi) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
A femur occurs a fracture easily as it is broken, since it is surrounded at a thick muscle etc. But a problem of impediment by a reduction and a fixing still remains. An augumentation is recently used as a method of a fracture. We analyzed a various stress and displacement of a femur as a finite element analysis in this project. And we make certain that a profit of an augumentation existed from the result.
심동혁(D. H. Shim),김정훈(J. H. Kim),고석훈(S. H. Ko),김경훈(K. H. Kim),김대열(D. Y. Kim),최명진(M. J. Choi) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
According to development of medical science and engineering, people has made efforts to solve the discomfort of body accident as well as the life span. Many cases that reduce pain of a hip joint or limitation of motion using Revision Total Hip Replacement are getting increased. However it has not proved which material is the most appropriate. Scientists are still studying about materials of the artificial joint. In accordance with advance of science, the materials are getting better. Recently, when Revision Total Hip Replacement is performed, typical materials sre Ti-alloys Ceramics. We have studied materials of artificial joints and analyzed which one is better for human"s body.