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] 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.

[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.

크랭크축 각속도의 변동을 이용한 실화 판정(1)

배상수(S.S.Pae),임병진(B.J.Lin),김세웅(S.W.Kim),김응서(E.S.Kim) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.2

The crankshaft speed fluctuation was measured every crank angle. In order to detect the misfire, the engine and the dynamometer were considered as a single-degree of freedom system. From this modeling, the detection criteria were derived and examined by the engine test. By this method the single misfire or multiple misfires can be detected. Even on tho condition of low load and highr speed than 3000rpm. where it was difficult through the other methods, misfire detection was carried out steadily. From this results, the method proposed by this paper proved reasonable.

공기 보조 연료 분사 장치가 있는 가솔린 기관의 희박 연소에 관한 연구

김세웅(S. W. Kim),김응서(E. S. Kim) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.2

This paper describes the effect of air assisted fuel injection system(AAr) using compressed air to improve the performance of lean combustion engine. AAI is designed to promote fuel atomization and intake flow. In order to investigate the performance of engine with AAI, experiments are conducted varying the engine revolution speed, lean air-fuel ratio and intake manifold pressure.<br/> Compared with the original engine, the performance of the engine with AAI is improved as the air-fuel mixture becomes leaner or the engine load becomes lower. The descreasing rate of BSFC is propotional to the relative air-fuel ratio and the lean misfire limit extended more than 0.2 relative air fuel ratio.<br/> This paper describes the effect of air assisted fuel injection system(AAr) using compressed air to improve the performance of lean combustion engine. AAI is designed to promote fuel atomization and intake flow. In order to investigate the performance of engine with AAI, experiments are conducted varying the engine revolution speed, lean air-fuel ratio and intake manifold pressure.<br/> Compared with the original engine, the performance of the engine with AAI is improved as the air-fuel mixture becomes leaner or the engine load becomes lower. The descreasing rate of BSFC is propotional to the relative air-fuel ratio and the lean misfire limit extended more than 0.2 relative air fuel ratio.<br/> This paper describes the effect of air assisted fuel injection system(AAr) using compressed air to improve the performance of lean combustion engine. AAI is designed to promote fuel atomization and intake flow. In order to investigate the performance of engine with AAI, experiments are conducted varying the engine revolution speed, lean air-fuel ratio and intake manifold pressure.<br/> Compared with the original engine, the performance of the engine with AAI is improved as the air-fuel mixture becomes leaner or the engine load becomes lower. The descreasing rate of BSFC is propotional to the relative air-fuel ratio and the lean misfire limit extended more than 0.2 relative air fuel ratio.<br/>

[論文] 흡기 밸브 주위의 정상 상태 유동에 관한 실험적 연구

이상석(S.S.Lee),이석재(S.J.Lee),김응서(E.S.Kim) 한국자동차공학회 1991 오토저널 Vol.13 No.6

In order to investigate the characteristics of flow around the intake valve exit, discharge coefficient and the velocity near the valve exit in steady state were measured using X-type hot­wire. Valve and valve seat insert used in experiment were constructed as the same shape of pro­duction engine and the flow characteristics at various flow rates and valve lifts were investigated.<br/> From the results of discharge coefficient measurements, it is observed that there exists a similarity between the flow characteristics around the production engine valve and the typical poppet valve. Measurement of the velocity at the valve exit shows that the normalized radial velocity distribution is independent of the flow rate. When the mass flow rate is small, the dif­ference between the primary direction of flow and the valve angle is large, but the difference becomes smaller as the flow rate increases.

사이클 내 크랭크축 각속도의 변동 해석

배상수(S.S.Pae),임인건(I.K.Lim),김세웅(S.W.Kim),김응서(E.S.Kim) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.2

This paper presents the characteristics of the crankshaft speed fluctuations. To analyze them, the speed waveforms were measured both at the flywheel and at the front end of the engine. The speed waveform measured at the flywheel shows better result than at the front end one, because of the torsional vibration and the auxiliary components. And the patterns of the speed fluctuations are classified into three region, such as low load, middle load and high load region with the variations of the loads. Additionally, as the engine speeds increase and the loads decrease, the analysis of the speed becomes more difficult due to lower variation of the speed. And in an the regions, the main frequency component of the speed fluctuation is firing frequency.

[論文] 흡배기 관내의 비정상 유동을 고려한 4사이클, 4기통 전기·점화 기관의 성능 예측에 관한 연구

박성서(S.S.Park),김응서(E.S.Kim) 한국자동차공학회 1991 오토저널 Vol.13 No.6

In this study, the analytic investigation of the unsteady flow in the intake and exhaust pipes has been carried out using the method of characteristics in one direction to predict volumetric efficiency. Based on the calculated volumetric efficiency, three zone predictive analysis using Wiebe function was applied to predict the engine performance and the results were compared with experiment. Mixture in the cylinder is subdivided into three zones during combustion process in this analysis; adiabatic core zone, thermal boundary layer zone and unburned zone. In each zone, pressure, temperature and gas composition have been calculated.<br/> In conclusion, it is possible to take account of the intake and exhaust pipe tuning effect in predicting the engine performance, by the analytic solution of the unsteady flow in the pipes, and comparison of prediction with experimental results shows a good agreement on the pressure variation in the intake and exhaust pipes which has a direct influence on the volumetric efficiency and performance of the engine.

크랭크축 각속도의 변동을 이용한 실화 판정(2)-실차 실험-

배상수(S.S.Pae),남하욱(B.J.Lim),김세웅(S.W.Kim),김응서(E.S.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2

To keep up with the regulation of OBD Ⅱ ( on board diagnostics Ⅱ ). many detection methods have been developed. Among them. the method of using the crankshaft speed fluctuation is most noticeable in the point of<br/> view of lower cost and easily-equipped charateristics. On the basis of the results obtained by the experiment of the engine and dynamometer. the integrating torque index (ITI) has been introduced.<br/> In this research, the instrumental and the interfacing systems to engine control unit ( ECU ) are developed for the vehicle test. So the vehicle and chassy-dynamometer test can be carried out in addition to the rough road test.<br/> From this test. the method proposed before proved to be applicable to the real vehicle<br/>

사이클 내 크랭크축 각속도의 변동 해석

배상수(S.S. Pae),임병진(B.J. Lim),임인건(I.K. Lim),박종범(J.B. Park),김응서(E.S. Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1

This paper presents the characteristics of the crankshaft speed fluctuations. To do this, the speed waveforms were measured both at the flywheel and the front end of the engine. The speed waveform measured at the flywheel shows better result than at the front end one, because of the torsionai vibration and the auxiliary components. And the patterns of the speed fluctuations are classified into three region, such as low load, middle load and high load region with the variations of the loads. Additionally, as the engine speeds increase and the loads decrease, the analysis of the speed becomes more difficult due to the lower variation of the speed. And in all the regions, the main frequency component of the speed fluctuation is firing frequency.<br/>