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Interactive Text Processor의 구현
김응서(E.S.Kim),김경수(G S Kim),김기원(G W Kim),유재우(C.W.Yoo),송후봉(H B Song) 한국정보과학회 1989 한국정보과학회 학술발표논문집 Vol.16 No.1
Text processor란 컴퓨터를 이용하여 문서의 작성, 편집을 수행할 수 있는 software를 말한다. 현재 우리가 사용하는 대 부분의 text processor는 문서의 중간 중간에 문서 편집 명령을 넣어 출력시 작용하게하는 batch-oriented text processor로서, 문서를 작성, 편집을 할 때 사용자의 의도를 반영하기 위하여 몹시 귀찮은 작업을 많이 해야 한다. 따라서, 기존의 방식에서 나타나는 문제점을 해결하고, 사용자에게 보다 편리한 interactive text processor를 설계하고자 한다. 본 연구에서는 프로그래밍 언어 분야에서 많이 연구되고 있는 attribute grammar를 이용하여 문서들을 attributed tree로 표현하고, 대화적으로 수정 및 편집을 수행하기 위하여 점진적인 평가 기술을 text processor에 적용하는 방법을 설계, 구현하였다.
[論文] Methanol을 燃料로 한 電氣點火 機關의 排出物 濃度豫測에 관한 硏究
김응서(E. S. Kim),김상호(S. H. Kim) 한국자동차공학회 1983 오토저널 Vol.5 No.1
A prediction of emission concentrations was made by calculating chemical equilibrium on the basis of an indicated pressure diagram in spark ignition engine using methanol as a fuel.<br/> A prediction according to Otto cycle was also made and for carbon dioxide, carbon monoxide and nitric oxide, emission test was performed using a conventional SI engine that was modified a little considering fuel characteristics.<br/> An investigation was made for those three cases-results from an indicated pressure diagram, Otto cycle and emission test.<br/> A good agreement between the measured values and the predicted ones existed for carbon dioxide and carbon monoxide, but not for nitric oxide. And good results existed for the other emission concentrations.
[論文] 메탄올-물 混合燃料機關에 關한 硏究(사이클 시뮬레이션에 의한 예측)
김응서(E.S.Kims),정진은(J.E.Chung) 한국자동차공학회 1981 오토저널 Vol.3 No.3
A cycle simulation of 4 cycle spark ignition engine using methanol-water blend as a fuel has been developed for study of prediction of power, specific fuel consumption, mean effective pre- ssure and thermal efficiency. One-dimensional flow model for intake process and thermodynamic model for combustion process were selected.<br/> After, performance test was made with conventional engine which was modified in considera tion of fuel properties. And computational results by simulation have been compared with experi mental results.<br/> As the agreement between computational and experimental results was good, prediction of engine performance by model was possible.
디젤 입자상물질 후처리 장치에서 입자상물질의 연소에 미치는 재생 인자의 영향
김재업(J. U. Kim),조훈(H. Cho),김형욱(H. U. Kim),박동선(D. S. Park),유천(C. You),김응서(E. S. Kim) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.2
The effects of the regeneration parameters such as inlet gas temperature, space velocity, oxygen concentration of the exhaust gas, and initial particulate loading on the oxidation of the particulate inside ceramic cordierite filter have been investigated through an engine experiment. As the inlet gas temperature increases, the remarkable filter temperature occurs owing to the rapid combustion rate. Though the higher space velocity affirms the safe regeneration, it also requires much fuel consumption of the burner. For that reason, the space velocity should be compromised considering the fuel economy. The excessive accumulation of the particulate may cause undesirable regeneration temperatures inside filter even under the optimized regeneration condition.<br/> The inlet gas temperature should be selected to overcome the variation of the oxygen concentration which is inherent feature of the diesel engine. It is the most important factor in the regeneration control techniques.<br/>
김상호(S. H. Kim),이용규(Y. G. Lee),김재업(J. U. Kim),김응서(E. S. Kim) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.6
An injection control valve(ICV) was designed to control the fuel flow between a common rail and an injector with two commercial solenoids. To improve the performance of ICV, the characteristic method was applied. With this method, the flow characteristics in the ICV and the injector were studied and the parameters which affect the injection characteristics were also studied. From this study, following results were obtained.<br/> The injection duration can be controlled and with modifications of the effective valve stroke of ICV, the injection quantity and duration can be reduced to desired amount. Also the injection quantity and pressure can be controlled by reducing the hole size of the injector without the variation of the injection duration. For some conditions, the desired injection characteristics can be obtained by the changes of the valve timing, the effective valve stroke, the open pressure of the injector and the hole size of the injector.
디젤 입자상물질 후처리 장치에서 입자상물질의 연소에 미치는 재생 인자의 영향
김재업(J.U.Kim),조훈(H.Cho),김형욱(H.U.Kim),박동선(D.S.Park),김응서(E.S.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The effects of the regeneration parameters such as inlet gas temperature, space velocity, oxygen concentration of the exhaust gas, and initial particulate loading on the oxidation of the particulate inside ceramic cordierite filter have been investigated through an engine experiment. As the inlet gas temperature increases, the remarkable filter temperature occurs owing to the rapid combustion rate. Though the higher space velocity affirms the safe regeneration, it also requires much fuel consumption of the burner. For that reason, the space velocity should be compromised considering the fuel economy. The excessive accumulation of the particulate may cause undesirable regeneration temperatures inside filter even under the optimized regeneration condition.<br/> The inlet gas temperature should be selected to overcome the variation of the oxygen concentration which is inherent feature of the diesel engine. It is the most important factor in the regeneration control techniques.<br/>
김상호(S. H. Kim),김석준(S. J. Kim),이만복(M. B. Lee),김응서(E. S. Kim) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.6
As a fundamental study to apply high pressure injection system to direct injection diesel engine, fuel injection system and constant volume combustion chamber were made and the behaviors of evaporating spray with the variation of injection pressure and the ambient gas temperature were observed by using high speed camera, and the combusion characteristics with the variation of injection pressure and A/F ratio were analyzed.<br/> As injection pressure increases, spray tip penetration and spray angle increase and, as a results spray volume increases. This helps an uniform mixing of fuel and air. Spray liquid core length decreases as ambient gas temperature increases, while it decreases as injection pressure increases but the effect of ambient gas temperature is dorminant.<br/> As injection pressure increases, ignition delay is shortened and combustion rate being raised, maximum heat release rate increases. It become clear that High injection pressure has high level of potential to improve the performance of DI-diesel engine.<br/>
가위형 링크 기구를 이용한 기관의 피스톤 온도 분포 측정
김재업(J. U. Kim),이종화(J. H. Lee),김세웅(S. W. Kim),김응서(E. S. Kim) 한국자동차공학회 1993 한국 자동차공학회논문집 Vol.1 No.2
The program for the development of linkage system was made and the scissors-type linkage system was designed. The piston temperature distribution under steady state was measured by the linkage system and thermocouple. The effects of engine speed, coolant outlet temperature, and torque on the piston tempera-ture were investigated.<br/> The peak temperature finds itself at the center of piston crown and the temperature of the exhaust valve side is about 10℃ higher than that of the intake valve side. As engine speed increases, piston temperature goes up almost linearly and the increasing rate was lower in the skirt than in the crown. As coolant outlet temperature increases by 10℃, piston temperature increases by 6~7°C at each measuring point In case of torque the increasing rate is higher in the lower load than in higher load.<br/> The scissors-type linkage system is useful for temperature measurements and can be used in other physical property measurements in the moving parts, such as piston and connecting rod assembly.<br/>
[論文] 스월이 정적연소실의 난류연소에 미치는 영향에 관한 수치해석
정진은(J. E. Chung),김응서(E. S. Kim) 한국자동차공학회 1991 오토저널 Vol.13 No.1
A multidimensional numerical simulation of turbulent combustion in a constant volume bomb is implemented to clarify the effects of swirl on combustion. This simulation includes the ICED-ALE numerical technique, the skew - upwind differencing scheme, the modifIed k-ε turbulence model, and the combustion model of the Arrhenius type and the turbulence mixing-control type. The calculations of the turbulent combustion with swirl are carried out. It shows that the results agree with the measurements allowably. Therefore, the effects of swirl on tubulent combustion are examined through the parametric study of swirl.