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[가솔린엔진부문] CNG 전소엔젠에서의 연소특성에 관한 연구
김진영(J.Y. Kim),이중순(J.S. Lee),정성식(S. S. Chung),하종률(J. Y. Ha) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
In the view of exhaust emission reduction, in order to meet stricter regulation, the efficient supply and use of energy, researches and developments of the alternative fueled engine have been conducted over the world. The necessity of CNG engine development has been also increased domestically.<br/> In the present study, a conventional gasoline engine was modified to a CNG engine, which can be operated with CNG only, and an engine bench test was performed to calibrate the operating parameters of the engine such as air fuel ratio, spark advance and etc. under various operating conditions. Then, the CNG engine installed on engine dynamo-meter was performed to examine the combustion pressure and exhaust emission characteristics.
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.
사진식각공정과 물방울 형틀을 이용한 PDMS 렌즈 제작
김진영 ( Jin Young Kim ),성중우 ( Jung Woo Sung ),조성진 ( Seong J Cho ),김철홍 ( Chul Hong Kim ),임근배 ( Geun Bae Lim ) 한국센서학회 2013 센서학회지 Vol.22 No.5
We developed a novel fabrication method of polydimethylsioxane (PDMS) lens, which can easily control the shapes of the lens using soft lithography with common photolithography and water droplet molding. A mold for PDMS lens was prepared by patterning of hydrophobic photoresist on the hydrophilic substrate and dispensing small water droplets onto the predefined hydrophilic patterns. The size of patterns determined the dimension of the lens and the dispensed volume of the water droplet decided the radius of curvature of the PDMS lens independently. The water droplet with photoresist pattern played a robustly fixed mold for lens due to difference in wettability. The radius of curvature could be calculated theoretically because the water droplets could approximate spherical cap on the substrate. Finally, concave and convex PDMS lenses which could reduce or magnify optically were fabricated by curing of PDMS on the prepared mold. The measured radii of the fabricated PDMS lenses were well matched with the estimated values. We believe that our simple and efficient fabrication method can be adopted to PDMS microlens and extended to micro optical device, lab on a chip, and sensor technology.
혼합기의 유동 및 점화에너지 방전특성이 초기화염의 전파에 미치는 영향
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.5_1
Ignition instabilities and reduced flame propagation rates result in the increased cycle-to-cycle combustion variations associated in lean burn.<br/> Combustion stability under lean mixture conditions could be improved by increasing burning rates through enhanced flow characteristics and by securing ignitability with newly developed ignition systems.<br/> Inclined tumble(swirl) flows were induced by three different swirl control valves. The initial flame propagation was visualized by an ICCD camera and its image were analyzed to compare the enflamed area and displacement of intial flames<br/> It was found that there is a correlation between the stronger tumble during induction and comparison and turbulence levels at the time of ignition resulting in faster flame development. Inclined tumble was proved to be more beneficial than the pure tumble for shorter combustion duration and stable combustion under lean mixture conditions, which was confirmed by faster propagation flame image.<br/>