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동역학적 해석 기법을 이용한 댐퍼 스토퍼 형상 최적화에 대한 연구
서중교(Junggyo Seo),홍순석(Soonseok Hong),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Torque converter in automatic transmission transfers the engine power to transmisson by ATF and lock-up clutch. The lock-up clutch connects the engine torque directly to transmission. At this moment, the relative rotational speed difference between engine and transmission, so the impact may occur. Because of this resistance and durability are required. In an effort to compensate for the impact of mechanical stopper is applied. The shape of the mechanical stopper affects the stress distribution of lock-up clutch. In this work, Using Dynamic Analysis of stress distribution on the shape of the mechanical stopper and safety confirmed, and studied its optimal shape.
유한요소 해석을 이용한 토션 댐퍼의 온도 분포와 열응력에 대한 연구
서중교(Junggyo Seo),홍순석(Soonseok Hong),장재덕(Jaeduk Jang),주인식(Insik Joo) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The current automotive market, competition for the development of a hybrid car is accelerating. Due to stricter environmental regulations and development of alternative energy vehicles is required. Hybrid vehicles significantly reduce fuel consumption and harmful gas emissions. In hybrid vehicle system, torsion damper makes the powertrain system stabilized by reducing the fluctuation torque of various engine system when the engine using. Torsion damper structure in the present study sensor wheel and ring gear is manufactured by welding. At this time, the temperature will rise temporarily when combined torsion damper welded. Due to the temperature rise, it is important to design the thermal deformation of the torsion damper internal parts and does not exceed the allowable temperature. In this work, the torsion damper thermal deformation and thermal stress analysis was used for ANSYS.
간 유입혈류 차단 후 간절제술 시 Isoflurane 과 Propofol 이 술 후 간기능에 미치는 영향 비교
임동건,백운이,박진웅,홍정길,서중교,정석현 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.38 No.3
Background : Anesthesia and surgery may exacerbate liver function in patients with pre-existing liver disease so it is important to choose less hepatotoxic anesthetics in patients with chronic liver disease. Methods : This study was designed to examine the postoperative liver function test in 150 patients after hepatectomy with portal triad clamping through retrospective chart review. Patients were divided into an isoflurane group (group I, n= 56) and a propofol group (group P, n = 57) by used anesthetics for maintaining anesthesia. Aspartate aminotransferase (AST), alanine aminotransferase (ALT), lactate dehydrogenase, alkaiine phosphatase, total bilirubin, albumin, and prothrombin time were checked at preoperation, and postoperatively at 1, 3, 7 and 14 days in the two groups. Indocyanine retention rate (ICG-R15) was measured at preoperation, and postoperatively at 1 and 7 days. Results : AST values increased postoperatively at 1, 3, 7, and 14 days compared with preoperation. ALT values increased postoperatively at 1, 3 and 7 days compared with preoperation and there was difference between group I (443.8 ± 52,1 U/L) and group P (202.7 ± 24.7 U/L) at postoperative 1 day. Other values had no significant difference between the two groups. Conclusions : Though it might need a well controlled study to find the differences in effect between isoflurane and propofol on the postoperative liver function test, we concluded that total intravenous anesthesia using propofol is also one of the safest anesthetic methods for hepatic resection with minimal hepatotoxicity. (Korean J Anesthesiot 2000; 38: 463-468)
내독소로 유도된 흰쥐 대동맥에서 Halothane 투여시 혈관반응에 대한 L-NAME, Aminoguanidine 및 Hydroxocobalamin의 수축력의 비교
임동건,김병권,백운이,박진웅,홍정길,서중교 대한마취과학회 1999 Korean Journal of Anesthesiology Vol.36 No.5
Background : Recent studies demonstrated that volatile anesthetics suppress the NO-cGMP system in the vascular system. It has been known that the hemodynamic changes produced by volatile anesthetics in septic patients are mediated by upregulation of iNOS leading to excessive release of NO. The mechanisms underlying suppression of the NO-cGMP system by anesthetics are still controversial. It has been elucidated that nitric oxide synthase (NOS) plays a major role in the regulatory function in the L-arginine-NO system. So we examined the effects of NOS inhibitor (L-NAME, aminoguanidine) and NO scavenger (hydroxocobalamin) on vascular smooth muscle contractile function in lipopolysaccharide (LPS)-treated rat aorta during halothane administration. Methods : Aortic ring preparations were obtained from LPS-treated (1.5 mg/kg, ip, for 18 h) rats. We evaluated the effects of hydroxocobalamin, L-NAME and aminoguanidine on contractile responses to phenylephrine during halothane (1 & 2 MAC) administration respectively. Statistical significances (P<0.05) were analyzed according to data characterictics by repeated measures ANOVA test and student's t-test. Results : The contractile responses to phenylephrine in LPS-treated rats aorta were significantly (P<0.05) increased in the presence of hydroxocobalamin and L-NAME. During the halothane (1 and 2 MAC) administration, the contractile responses to phenylephrine in LPS-treated rats aorta were increased significantly (P<0.05) in the presence of hydroxocobalamin and L-NAME. Conclusions : From these results, it is suggested that hydroxocobalamin and L-NAME may be useful in the therapy of septic shock. (Korean J Anesthesiol 1999; 36: 876∼882)