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박상봉(S.B.Park),이은현(E.H.Lee),유정열(J.Y.Yoo),이준식(J.S.Lee),최해천(H.Choi) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
To understand in-cylinder flow characteristics in a lean bum engine. flow experiments under steady conditions without a piston are carried out. Three-dimensional velocity fields at various valve lifts are measured using an LDV. Non-dimensional swirls for the standard and helical ports are obtained from the measured velocities and compared.<br/>
에틸렌글리콜 부동액과 프로필렌글리콜 부동액의 엔진 및 차량 냉각성능 비교
류택용(T.Y.Ryu),이은현(E.H.Lee),최재권(J.K.Choi) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In this paper, we studied about the effects of coolant temperature, altered coolants and their composition rates(100% of water. 50% of EG. 50% of PG. 100% of EG. 100% of PG. respectively) on the engine metal temperature, heat balance and engine knock characteristics. Also, we studied cooling performance difference between PG coolant and EG coolant in vehicle.<br/> The highest metal temperature was obtained with 100% EG, and followed by 100% PG. 50% PG. 50% EG and 100% water.<br/> The increment of antifreeze concentration and coolant temperature reduced the heat rejection rate to coolant. And the reduced heat rejection rate to coolant resulted to increase the heat rejection rate to oil and energy loss to exhaust gas. However, the engine knock characteristics was not affected until 50% antifreeze concentration but spark timing was retarded 3° CA for 100% antifreeze as coolant.<br/> 50% PG coolant was less effective than 50% EG coolant in the vehicle cooling performance because its boiling temperature is lower than EG coolant and the coolant temperature in the vehicle was higher than when the EG coolant was used for the same operating condition.<br/>
한국인에서 B형간염의 임상경과와 HLA DRB1*13 및 TNF - α promoter 유전자 다형성과의 상관관계에 대한 고찰
정재연 ( J. Y. Cheong ),한광협 ( K. H. Han ),송건훈 ( K. H. Song ),신전수 ( J. S. Shin ),장혜영 ( H. Y. Chang ),전은현 ( E. H. Chun ),이관식 ( K. S. Lee ),전재윤 ( C. Y. Chon ),문영명 ( Y. M. Moon ) 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-
<목적> B형간염은 감염후에 다양한 임상경과를 갖는데 MHC classⅡ 대립유전자인 HLA-DRB1*1302가 바이러스 제거에 관여함이 제기되었고, 본교실에서는 1272명의 분석을 통해 HLA-DR13과 HBV의 제거와의 상관관계를 보고하였다. 본연구는 B형간염의 임상경과와 HLA-DR 및 TNF-α promoter 유전자 다형성과의 상관성을 알아보고자 하였다. <대상 및 방법> 1999년 1월부터 2001년 8월까지 세브란스병원에 내원한 176명을
엔진 및 차량냉각계의 냉각수유량 측정실험 및 계산방법에 관한 연구
오창석(C.S.Oh),류택용(T.Y.Ryu),이은현(E.H.Lee),최재권(J.K.Choi) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In this study, the prediction method of coolant flow rates has been developed and applied to an engine and vehicle cooling system. The flow rate passing through each component of the system is very important parameter to evaluate the heat release process from the combustion gas to the coolant and the heat rejection process from the radiator/heater to the ambient air. However, the present study reveals that the measurement using the flowmeter fails to give practical flow rates due to its additive resistance. In contrast, the present method which uses the parellel and serial relationship of flow resistance proved to be a good tool to predict the real flow rates. It can be also used to design the cooling system in the incipient stage of engine/vehicle development. The procedure was coded to the computer program so as to use it flexibly and, in the future, to expand it into an independent design tool of the whole cooling system including the heat release and rejection.<br/>
류택용(T. Y. Ryu),신승용(S. Y. Shin),이은현(E. H. Lee),최재권(J. K. Choi) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
This paper is purposed on improving the characteristics of knock, emission and fuel consumption rate by optimizing the location and size of water transfer holes in cylinder head gasket without change of engine water jacket design. The cooling system was modified in the direction of reducing the metal surface temperature in the head and increasing the metal surface temperature in the block.<br/> The optimization of water transfer holes in cylinder head gasket was obtained by "flow visualization test". The water transfer holes were concentrated in front side of the engine in order to reduce thermal boundary layer in the water jacket of No.2 and No.3 combustion chamber in the cylinder head, which would have a large knock intensity, and increase thermal boundary layer in the water jacket of the cylinder block.<br/> When. the modified coolant flow pattern was applied as mentioned in this paper, the knock characteristic was improved. The spark timing was advanced up to 2' in low and middle speed range at a full load. Also, HC emission at MBT was reduced by 5.2%, and the fuel consumption rate was decreased up to 1% in the driving condition of 2400 rpm and 250 kpa. However, since this coolant flow pattern mentioned in this paper might deteriorate the performance of vehicle cooling system due to the coolant flow rate reduction, a properly optimized point should be obtained.<br/>