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섭동기법을 이용한 자동차용 브레이크 시스템의 열탄성 불안정성 해석
하태원(Taewon Ha),조용구(Yonggoo Joe),김흥섭(Hungsub Kim),이정윤(Jungyun Lee),오재응(Jaeeung Oh) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Frictional heating in brakes causes thermoelastic distortion of the contacting bodies and hence affects the contact pressure distribution. The resulting thermo-mechanical coupling can cause thermoelastic instability (TEI) if the sliding speed is sufficiently high, leading to non-uniform heating called hot spots and low frequency vibration known as hot judder. Thermoelastic instability in automotive brake systems is investigated using analytical simple finite layer model. Critical speeds of the automotive disc brakes and drum brakes were predicted and the effects of the friction coefficient and material properties on the predicted critical speeds are calculated .
구순비 변형에서 인중부 구륜근판을 이용한 인중재건 및 비익기저 함몰의 교정
한기환,하태원,최동원 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.4
The philtrum of the upper lip is important to the facial contour and general appearance of individuals. In patients who have undergone cleft lip surgery, reconstruction of the philtrum is important in restoring the normal appearance of the upper lip and it also helps in diverting people`s attention away from the surgical scar. Several methods of philtral dimple creation have been used, but the postoperative results have not always been satisfactory. Between 1991 and 1997, reconstruction of the philtrum with unilateral cleft nasal deformity was performed in 43 patients, transposing the orbicularis oris muscle of the central upper lip to the depressed alar base. Using this method, efforts were made to achieve reconstruction of the philtrum and correction of alar base depression simultaneously. The results were rated good to excellent by a panel of judges using the ordinary scale method. Although reconstruction of the philtral dimple and correction of the depressed alar base were very successful, reconstruction of philtral column(especially the upper portion) was not satisfactory. Therefore, other procedures such as temporal fascial grafts in the upper portion of the philtral column should also be considered at the time of primary surgery or revisional surgery.