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김홍성(Hongsung Kim),박정서(Jungseo Park),김문헌(Munheon Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
It was established to the system, which adapted combustion system not following spark ignition system without any ignition apparatus. It was heated and controlled inlet-air into conventional single cylinder engin. Adapting the method of increasing inlet-air heating temperature made possible enhanced the compression ignition cbaIacteristics of gasoline fuel injected to intake-port. It was established the compression ignition gasolin engin. So, the system was investigated the emission characteristics of compression ignition gasolin engine. The conclusions of combustion emission chracteristics are as followed.<br/> The gasoline compression ignition system made possible to run lean bum(over air-fuel ratio 30) the engine, and emission of carbon monoxide was emitted little about the changes of air-fuel ratio. Inlet-air heating temperature and the changes of engine speed were hardly got influenced. The emission of hydrocaIbon was increased as much as air-fuel ratio's increased<br/> But the ranges of changes was very narrow. It was emitted little only as much as 2 ppm and 4 ppm within the changes of inlet-air heating temperature and engine speed. The emission of nitrogen oxide was decreased greatly as much as air-fuel ratio was decreased. When air-fuel ratio was over 45, the emission of nitrogen oxide was emitted little in case that the changes of inlet-air heating temperature and engine speed.<br/> The achievements of gasoline compression ignition system could improved that the emission concentrations of carbon monoxide, hydrocarbon and nitrogen oxide were reduced greatly.
Production of alpha 1-3-galactosyltransferase knock out micropig® by somatic cell nuclear transfer
HyunYong Choi,ChunGyu Park,YoungJune Kim,HyeYeong Yang,SeungWon Yoon,SeulGi Lee,HongSung Kim,JunWoo Kim,HyeongSeok Choi,SangJin Hwang,ChangGeun Suk,Chang-Gi Hur 한국실험동물학회 2018 한국실험동물학회 학술발표대회 논문집 Vol.2018 No.7
최윤종(Yunjong Choi),김홍성(Hongsung Kim),박정서(Jungseo Park),김문헌(Munheon Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
This study introduced the bulk combustion systems instead of the conventional gasoline spark ignition system and diesel compression ignition system. To achieving both high efficiency, without ignition systems to the conventional single cylinder diesel engine, established the inlet-air heating and control systems for the heating and controlling of inlet-air.<br/> The lean limit of air-fuel ratio improved by the inlet-air heating with the compression ignition combustion systems' and the allowable air-fuel ratio extended to 63 when the temperature of the inlet-air was 170 ℃ and the engine speed 1000 rpm.<br/> The cycle maximum pressure and the brake mean effective pressure increased to proportional, when the air-fuel ratio was richer.<br/> The brake specific fuel consumptions increased largely at the air-fuel ratio was above 45 and affected strongly by the inlet-air heating temperature.<br/> The maximum brake thermal efficiency showed at the air-fuel ratio was 35 and decreased in case the leaner region and improved the higher inlet-air heating temperature.<br/> The maximum heat release rate increased in according to decreased and advanced the<br/> accurance period of the maximum heat release rate.<br/> Also, as showed the mass burned rate, the burning period shorted and established the rapid combustion in according to the air-fuel ratio decreasing.<br/>
정적연소실내에서의 플라즈마 제트 점화에 대한 연소기간중의 열손실산정
김문헌(Munheon Kim),문경태(Kyungtae Mun),박정서(Jungseo Park),김홍성(Hongsung Kim) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.2
wall was investigated using instantaneous heat flux sensor, schlieren visualization, pressure rise curve. And the heat loss characteristics of plasma jet ignition were compared with conventional spark ignition. In case of plasma jet ignition, the flame kernel moves toward the center of combustion vessel in the initial period of combustion, and the flame surface spread out to the vessel wall. However, in case of conventional spark ignition, the flame surface contact with combustion vessel wall in the initial period of combustion. As a result, heat loss in the combustion duration for conventional spark ignition increase faster than that of plasma jet ignition. And the combustion enhancement rate of plasma jet ignition is higher than that of conventional spark ignition, and it was found that the heat loss rate is inversely proportional to the combustion enhancement rate.<br/>
김석훈,김철홍,장홍성,유인태,박성수,이동학,정원석,조진성,Kim Seokhoon,Kim Cheolhong,Chang Hongsung,Ryoo Intae,Park Sung-Soo,Lee Donghauk,Chung Wonsuk,Cho Jinsung 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.5B
최근 들어 무선 네트워크 연동이 중요한 이슈로 부각되고 있으며, 대표적으로 3G 네트워크와 곧 도입될 예정인 WiBro 네트워크와의 연동에 관심이 집중되고 있다. 3G-WiBro 연동망이 구성될 경우 사용자는 서비스 지역에 따라 최적의 서비스를 제공받을 수 있으며, 사업자는 망 구축 및 운용비용을 절감할 수 있기 때문이다. 이를 위해 본 논문에서는 3G-WiBro 연동망에서 고속 핸드오프 지원을 위한 효율적인 연동 구조 및 세부적인 연동 방안을 제안한다. 본 논문에서 제안한 Smoothly Coupled Integration 방안은 Loosely Coupled Integration 방안과 Tightly Coupled Integration 방안의 장점을 수용할 수 있으며, 아울러 3G 네트워크와 WiBro 네트워크가 개별적으로 동작하면서도 고속 핸드오프 지원을 통한 Seamless 서비스와 이동성을 제공할 수 있는 구조를 갖고 있다. 제안한 방안의 성능을 검증하기 위해 OPNET을 이용한 컴퓨터 시뮬레이션을 수행하였으며, 이를 통해 제안한 방안의 우수성이 검증되었다. Nowadays the integration of heterogeneous wireless networks become a hot issue in communications research area. Especiall,y, 3G and WiBro interworking will be introduced soon as users can be offered the most suitable service according to service area and service providers can reduce network construction and operation expenses. In this paper, we propose an interworking scheme for fast handoff between 3G and WiBro networks. The SCI (Smoothly Coupled Integration) scheme proposed in this paper takes advantages of the existing LCI (Loosely Coupled Integration) and TCI (Tightly Coupled Integration) scheme and can offer seamless services by providing fast handoff between 3G and WiBro although each network may work independently. Through extensive computer simulations using OPNET, the efficiency of the proposed scheme has been validated.