http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
[가솔린엔진부문] UEGI 기술을 이용한 촉매온도제어에 관한 연구
조용석(Yongseok Cho),이윤석(Yunseok Lee),김충식(Choongsik Kim),최진욱(Jinwook Choi),천준영(Junyoung Chun) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Reduction of catalyst light-off time in the cold start period is crucial to reduce the HC and CO emissions and to meet the ULEV emission regulation. In this study, a new approach to solve this problem has been studied experimentally. The UEGI (Unburned Exhaust Gas Ignition) technology developed in this study ignites the unburned fuel-air mixture at the exhaust manifold to warmup a CCC (Close-coupled Catalytic Converter) during cold start. The experimental results showed that the UEGI technology can effectively shorten the catalyst light-off time and reduce the HC and CO emissions.
[가솔린엔진부문] 냉시동시 미연 배기가스 점화 기술이 촉매 온도 상승 및 분포에 미치는 영향
조용석(Yongseok Cho),엄인용(Inyong Ohm),김인탁(Intak Kim),김충식(Choongsik Kim),최진욱(Jinwook Choi),천준영(Junyoung Chun) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To make close-coupled catalytic converter (CCC) reach light-off temperature within a few seconds after cold-start, UEGI technology was developed to warm up the CCC. The unburned exhaust mixture is ignited by four glow plugs installed upstream of the catalyst. To verify the temperature rise effect by UEGI technology, CCC temperature distribution was measured with thermocouples. The results con finned that UEGI system makes easier for CCC to reach light-off temperature and shortens light-off time. The results also showed that UEGI system doesn't affect CCC temperature distribution so much, but the shape of exhaust manifold strongly affects the temperature distribution.
조용석 ( Yongseok Cho ),황문태 ( Moontae Hwang ),김상헌 ( Sangheon Kim ) 서울대학교 한국행정연구소 2018 行政論叢 Vol.56 No.2
정부의 예산은 시민의 세금을 기반으로 한다는 점에서 공적인 목적을 위해서 활용되어야 한다. 하지만 재량수준이 매우 높은 업무추진비에 대한 감시와 통제는 미약한 실정이다. 그 결과 선출된 공직자들이 업무추진비를 사적 혹은 정치적 목적으로 유용하고 있다는 문제가 지속적으로 제기되고 있다. 이번 연구는 정치적 요인이 업무추진비에 영향을 미치는지에 대하여 광역자치단체장 수준에서의 분석을 목표로 했다. 분석결과에 따르면 정치적 경쟁 수준, 3선 여부 등의 변수가 전체 예산에서 업무추진비가 차지하는 비중과 연관이 있는 것으로 나타났다. 또한 자치단체장을 견제해야할 지방의회는 적어도 업무추진비에 대해서는 그 역할이 미흡한 것으로 보인다. 이러한 연구결과는 업무추진비에 대한 더 높은 수준의 정보공개와 제도적 통제가 필요함을 시사한다. The business promotion expense is a budget item in Korea that has rarely been investigated empirically so far. One of the critical issues concerning the business promotion expense is its misuse by the chief executives of local governments. The executives might have room to exercise a fair amount of discretion in planning and budgeting of the promotion expense. By constructing a panel data set, we try to estimate the impact of political factors on the business promotion expense budgeting in the metropolitan cities and provinces in Korea. The empirical results show that a mayor (or governor) tends to expand the expense budget when she faces tough competition in the next election. We also find that the local councils are not successful in checking mayors’ (or governors’) discretion in the business promotion expense budgeting. These findings support the doubt widely spread among the public that local government chief executives misuse the business promotion expense and that the local councils fail to correct the executives’ behavior regarding it. We therefore recommend that a new system should be introduced to monitor the business promotion expense in the local governments of Korea.
[가솔린엔진부문] 냉시동시 미연 배기가스 점화 기술을 이용한 배기저감
조용석(Yongseok Cho),김충식(Choongsik Kim),최진욱(Jinwook Choi),천준영(Junyoung Chun),김인탁(Intak Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To alleviate the problems of air pollution caused by vehicles, many researchers are trying to develop new emission reduction technologies. In this study, UEGI technology was developed to help three way catalyst's fast light-off. A HC adsorber was applied to UEGI system to improve emission reduction perfo그ance of the system. Experimental results showed that closed-coupled catalyst's light-off time and HC and CO emissions are significantly more reduced by UEGI technology with the HC adsorber. There were 50.8% reduction of THC and 94.4% reduction of CO by the UEGI system, and 78.1% of THC and 96.6% of CO were reduced by the UEGI system with the HC adsorber
분사방식에 따른 단실린더 수소기관 성능 및 배출가스 특성에 관한 연구
조인억(Ineok Cho),박경균(Kyounggyun Park),이성욱(Seangwock Lee),조용석(Yongseok Cho),오상기(Sangki Oh),백두성(Doosung Baik),엄명도(Myoungdo Eom) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As an alternative energy in future hydrogen has been attracted since it might be a long-term solution to the limited global fossil energy. In particular, in automobile industries the technology of hydrogen fueled engine can bridge hybrid or fuel cell vehicles, and hydrogen fuel gives merits in wide ranges of combustion, improved thermal efficiency, close to zero harmful emissions except NOx and improved compression ratio by a higher octane number of hydrogen fuel itself. Despite many researches have conducted actively on the technique of directly injected hydrogen fuel rather than a pre-mixed type in order to reduce emissions and improve a power and response of combustion control, so far there are few comparison study on the performance and emission characteristics among direct injection and pre-mixed hydrogen engines and gasoline engines. This research aims to provide fundamentals of performance and emission characteristics between direct injection and pre-mixed type hydrogen engines comparing with gasoline engines, and may contribute in the development of a hydrogen engine in future.