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김형식(Hyeong-sig Kim),권순태(Soon-tai Kwon),이재원(Jae-won Lee),박찬준(Chanjun Park),엄인용(Inyoung Ohm) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
To securing basic data for intake port design, effects of a port masking on the part load performance were investigated in a 4 valve SI engine. For this purpose, 9 kinds of masking, which have different shapes and masking ratio, are applied to the engine intake system. The characteristics of the performance were estimated through mixture response test at various engine load and speed. The results show that lean misfire limit is expanded considerably and fuel consumption is improved due to the stratification which is caused by unequal flow distribution between the two intake ports. Another results show that NOx emission, one of indexes for stratification, increases considerably in spite of retarded spark timing due to the stratification which is caused by unequal flow distribution between the two intake ports. The mechanism of stratification by masking is different from axial stratification and the fuel entering through masked port plays a very important role in this stratification process. In conclusion, the port masking method could be easily applied to engine intake system and be very effective for inducing the stratified charging without the change of port design.
권순태(Soontai Kwon),김형식(Hyeong Sig Kim),이재원(Jaewon Lee),박찬준(Chanjun Park),엄인용(Inyong Ohm) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To securing basic data for intake port design, effects of a port masking on the part load performance were investigated in a 4 valve SI engine. For this purpose, 9 kinds of masking, which have different shapes and masking ratio, are applied to the engine intake system. The characteristics of the performance were estimated through mixture response test at various engine load and speed. The results show that NOx emission, one of indexes for stratification, increases considerably in spite of retarded spark timing due to the stratification which is caused by unequal flow distribution between the two intake ports. The mechanism of stratification by masking is different from axial stratification and the fuel entering through masked port plays a very important role in this stratification process. In conclusion, the port masking method could be easily applied to engine intake system and be very effective for inducing the stratified charging without the change of port design.
장열성(Yeolsung Jang),우성동(Sungdong Woo),김형식(Hyeong Sig Kim),박찬준(Chanjun Park),엄인용(Inyong Ohm) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper is second of 2 companion papers, which investigate the basic characteristics of gaseous LPG Injection. In this study, butane 100% was used as fuel to verify the real fuel effect such as vapor pressure variation due to temperature change. A MPI fuel injection system for v-6 engine, which has reverse "L" type cross section to minimize the possibility of liquid phase injection, was composed and one bank was operated under sequential injection scheme. Flow rate were measured according to injection duration, interval, and pressure. Also occurring of liquid phase injection was monitored with varying vaporizer and fuel rail temperature. The result shows that basic characteristics of injection is a relatively difference between air and LPG injection. Under cold start condition, however, the occurrence of liquid injection becomes more severe as the pressure increases, and sufficiently high temperature both in vaporizer and fuel rail is very important to insure gaseous injection. In addition, the temperature of vaporizer plays more important role in keeping LPG vapor state and the reverse "L" type cross section of the rail is available to prevent liquid injection.
우성동(Sungdong Woo),장열성(Yeolsung Jang),김형식(Hyeong Sig Kim),박찬준(Chanjun Park),엄인용(Inyong Ohm) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This is a first part of 2 companion papers, which investigate the basic characteristics of gaseous LPG injection. For examining gas injection features only and more clearly, air is injected instead of real LPG to eliminate all real fuel effects such as vapor pressure variation due to temperature change. Two fuel injection systems for v-6 engine, one of which is remote rail system and the other is similar to gasoline MPI, were composed and one bank was operated under sequential injection scheme. Flow rates and pressure fluctuations in the rail were measured with varying fuel supplying pressure, interval of injection, injection duration, and fuel supply method. Results show that the flow rate has acceptable linear relationship with injection duration within 33 msec injection interval, however, the linearity is guaranteed over 33msec due to shortage of vaporizer supply. In addition, unbalance of flow rate is observed when 3 injectors work sequentially and the lowest-flow-rate injector is always same in spite of changing fuel supply method. Also the results show that the pressure fluctuation characteristics is not affected by independent fuel rail but by fuel supply system from vaporizer to fuel rail. Lastly, large rail volume improves the pressure fluctuation and flow rate unbalance.
고지혈증 환자에서 Statin과 Fibrate 약물요법의 산화질소 생활성과 동맥경화반 안정화 표식자에 대한 효과
고광곤 ( Go Gwang Gon ),안정열 ( An Jeong Yeol ),진동규 ( Jin Dong Gyu ),한승환 ( Han Seung Hwan ),김형식 ( Kim Hyeong Sig ),최인석 ( Choe In Seog ),안태훈 ( An Tae Hun ),신익균 ( Sin Ig Gyun ),정의명 ( Jeong Ui Myeong ) 한국지질동맥경화학회 ( 구 한국지질학회 ) 2003 韓國脂質學會誌 Vol.13 No.2
고콜레스테롤혈증 환자에서 Simvastatin 단독 또는 Ramipril과 병합요법의 혈관내피세포 의존성 이완능에 대한 효과
고광곤 ( Go Gwang Gon ),손지원 ( Son Ji Won ),안정열 ( An Jeong Yeol ),류운석 ( Lyu Un Seog ),한승환 ( Han Seung Hwan ),김대성 ( Kim Dae Seong ),김형식 ( Kim Hyeong Sig ),신미승 ( Sin Mi Seung ),인태훈 ( In Tae Hun ),최인석 ( Choe 한국지질동맥경화학회(구 한국지질학회) 2002 韓國脂質學會誌 Vol.12 No.4
Objective: Because the mechanisms of the biological effects of statin and angiotensin converting enzyme inhibitor therapies differ, we studied the vascular responses to these therapies in hypercholesterolemic patients. Methods: We administered simvastatin