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사용자 인터페이스에서 비즈니스 이벤트의 가시적 응집도 향상 모델과 측정 방법
김진영(J.Y kim),김정옥(Jeong-Ok Kim),유철중(Cheol-Jung Yoo),장옥배(Ok-Bae Chang) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1B
사용자 인터페이스에서 비즈니스 이벤트의 가시적 응집도 향상을 위하여 의미적으로 서로 관련성을 갖도록 4단계로 클러스터링함으로써 비즈니스 업무의 이해도를 향상시키고, 사용성이 향상되도록 설계하는 방법을 제안한다. 이것은 클러스터링 단계별로 가시적 응집도를 향상시킬 수 있었다. 또한 사용자 인터페이스에서 비즈니스 이벤트의 기능적, 통신적, 순차적 응집도를 높여준다.
김진영(J.Y.Kim),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Initial flame development and propagation were visualized under newly developed ignition system to estimate the effects of ignition characteristics on the engine performance in a port injection SI engine. Effects of intake flow was also investigated by three different swirl control valves.<br/> Experiments were performed in an optical single cylinder engine modified from production engine. Flame images were captured through the quartz window mounted in the piston by high speed video camera and its image were analyzed to compare the intial flame area<br/> Results show that IMEP tends to rise slightly as the ignition duration gets longer. The direction of flame propagation is decisively governed by the in-cylinder flow motion. Every flame grows toward the exhaust valve, forming a kind of turbulent flame. The observed flame through the result of visualization is very similar to the result of analyzed from pressure data.<br/>
혼합기 유동 특성과 점화에너지 해석을 통한 신점화시스템 설계
김진영(J.Y.Kim),이종숭(J.S.Lee),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The combustion process of spark-ignition engine takes places in a turbulent flow field has been influenced by the flow characteristics of mixture and discharge energy. Experiments were carried out with parameters such as the shape of swirl control valves. discharge pattern and distribution of ignition energy.<br/> This study aims to development of ignition system by analysis of flow characteristics of mixture flow in an engine and ignition energy for enhancement of the ignitability of lean mixture.<br/>
김진영(J.Y.KIm),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha),배충식(C.S.Bae) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Lean burn combustion became an important concept for improving fuel economy and reducing exhaust emissions. However, lean burning is associated with increased cycle-to-cycle combustion variations due to the ignition instabilities and reduced propagation rates. Engine stability under lean mixture conditions could be improved by increasing burning rates through enhanced flow characteristics and by securing ignitability with better ignition systems.<br/> The effects of flow and ignition characteristics on the combustion performances are investigated in a 4-yalve SI engine. Flow characteristics of tumble-swirl were varied with swirl control valve attached at the inlet ports, while ignition energy and its distribution were controlled in a high-frequency ignition system by changing spark duration and spark frequency. The improvement of lean burn performance by the optimum flow and ignition characteristics was discussed.<br/>