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불확실한 수요를 고려한 공급사슬의 공장생산용량 결정에 관한 연구
지요한,임석진,김경섭 한국시뮬레이션학회 2003 한국시뮬레이션학회 논문지 Vol.12 No.1
This paper suggests the long-term strategy of the production distribution planning considering the capacity of factory production and the uncertain demand in a supply chain. This paper determines the near optimal capacity of factory production by using the advantages of mathematical and simulation models. Also, the relationship between the capacity from the suggested model and the strategy of production and distribution in a supply chain is studied. Arena is used for modeling and analysis.
[論文] 디젤 분무의 분무 형태와 입경 분포에 관한 실험적 연구
지요한(Y.H.Chi),이종화(J.H.Lee),김응서(E.S.Kim) 한국자동차공학회 1992 오토저널 Vol.14 No.3
To clarify the structure of a diesel spray, a transient non-evaporating diesel spray injected under<br/> different ambient pressure and different injection pressure was studied.<br/> Spray tip penetration and spray angle were measured by taking the high speed shadowgraph of spray and Sauter mean Diameter(SMD) was also measured by light scattering technique at different positions along the spray axis and at different time from the start of injection.<br/> The effects of the operating parameters on the spray shape and SMD were investigated. By increasing the injection pressure, the spray tip penetration and the spray angle increased and the change of the ambient pressure also resulted in the considerable change in the shape of the spray.<br/> The analysis of SMD measurement showed that the atomization is a process that continues in space and time. As the injection pressure increses SMD decreases rapidly and with the increase of the ambient pressure the atomization process ends faster than the lower ambient pressure and at lower ambient pressure the atomization process continues to much farther downstream and far afterward.
지요한(Y.H.Chi),김응서(E.S.Kim) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To clarify the structure of a diesel spray, a transient non - evaporating diesel spray injected into different ambient pressure with different inj ection pressure was studied.<br/> Size of the droplets comprising diesel spray was measured by laser light scattering method at different positions along the spray axis and at different time from the start of injection. Sauter mean diameter ( SMD ) and arithmetic mean diameter ( AMD ) were also calculated.<br/> Ttc effects of the operating parameters on the droplet size distribution and SMD were investigated. The analysis of SMD calculation showed that the atomization is a process that continues in space and time. As the injection pressure increases SMD decreases rapidly and with the increase of the ambient pressure the atomization process ends faster than the lower ambient pressure. At lower ambient pressure the atomization process continues to much fan her downstream and far afterward.<br/>
[論文] 멀티존 모델에 의한 改質메탄올을 燃料로 하는 電氣點火機關의 燃燒過程 및 排出物의 豫測
지요한(Yo Han Chi),김응서(Eung Seo Kim) 한국자동차공학회 1988 오토저널 Vol.10 No.1
Multi-zone model is applied to the spark ignition engine fueled with neat methanol and reformed methanol, which is formed by mixing pure reformed methanol obtained by dissociating liquid methanol into hydrogen and carbon monoxide, and neat methanol, to model the combustion process in the cylinder and predict the concentration of NO emissions.<br/> Exhaust gas was used as heat source for dissociating neat methanol into reformed methanol and the modeling was performed by comparing the cylinder pressure and combustion rate obtained from experiments and calculation.<br/> Calculated temperature distribution in the cylinder indicates that there is temperature difference between the spark plug and the opposite sides, the former is about 350-450 K higher than the latter.<br/> Flame propagation velocity of reformed methanol is 1-3 m/sec faster than that of neat methanol as a result of the combustion of the hydrogen in the reformed methanol.<br/> Calculated NO concentration is about 10% higher than that of experiments.
Common Rail HSDI 엔진에서 각종 변수가 엔진성능에 미치는 영향
지요한(Yohan Chi),김창호(ChangHo Kim) 한국자동차공학회 2001 한국자동차공학회 Workshop Vol.2001 No.-
Diesel engine powered passenger cars and light commercial vehicles are gaining increasing attentions from most of European countries and some other countries such as Japan and Korea. One of the most important technological advances in these recent move is attributed to the inovation of high pressure direct fuel injection system (FIE) which can be further represented by so called "Common Rail" FIE system. Another very dominant trend of the high speed direct injection (HSDI) engines on the market demand is the variable geometry turbocharger (VGT) which can overcome the typical weak point of most of turbocharged engines.<br/> In this paper some aspects of VGT parmaters and the fuel injection variables are discussed to see their potential for further improvement and refinement of HSDI engine perfonnance and emissions.