http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Gyeung Ho Choi,Sung Bin Han,Yon Jong Chung 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.8
The concept of hydrogen enriched LPG fuelled engine can be essentially characterized as low emissions and reduction of backfire for hydrogen engine. The purpose of study is obtaining low-emission and high-efficiency in LPG engine with hydrogen enrichment. In order to determine the ideal compression ratio, a variable compression ratio single cylinder engine was developed. The objective of this paper is to clarify the effects of hydrogen enriched LPG fuelled engine on exhaust emission, thermal efficiency and performance. The compression ratio of 8 was selected to minimize abnormal combustion. To maintain equal heating value, the amount of LPG was decreased, and hydrogen was gradually added. In a similar manner, the relative air-fuel ratio was increased from 0.8 to 1.3 in increment of 0.1. and the ignition timing was controlled to be at MBT each case.
김경호(Gyeung Ho Kim),성도경(Do Kyung Sung) 한국정부학회 2011 한국행정논집 Vol.23 No.1
최근 사회가 다원화, 복잡화됨에 따라 재난유형이 다양화·대형화되고 있어 체계적이고 효율적인 재난관리시스템을 구축해야 할 필요성이 증대하고 있다. 본 연구에서는 효율적인 재난관리체계를 제시하기 위하여 재난관리체계의 운영 효율화 요인인 유기적 통합성, 선제적 학습성, 연계적 협력성을 주요 변수로 하여 재난관리체계를 분석하였다. 특히 우리나라 재난관리체계의 실제 운용사례를 재난관리 선진국인 미국과 일본의 사례와 비교·분석함으로써 시사점을 도출하고, 우리나라 재난관리체계가 갖고 있는 문제점을 파악하여 효율적 운영방안을 제시하였다. As societies become more diversified and complex, the types of disaster are also become diversified and large-sized, and the effective operation of disaster management plan is required both national and local governments. Thus, this study analyzed the operation of disaster management system using factors such as organic integrity, anticipative learnability, and connective cooperation. To suggest the effective operation of disaster plan, comparison of disasters among the United States, Japan, and Korea was conducted using those three variables, and some implications were proposed.
Choi, Gyeung-Ho,Kim, Tae-Kwon,Cho, Ung-Lae,Chung, Yon-Jong,Caton, Jerald,Han, Sung-Bin The Korean Society for Energy 2007 에너지공학 Vol.16 No.1
The purpose of this study was to investigate the reduction of exhaust gas temperature in a LPG engine that had been converted from a diesel engine. A conventional diesel engine was modified to a LPG (Liquefied Petroleum Gas) engine by replacing the diesel fuel injection pump with a LPG fuel system. The research was performed by measuring the exhaust gas temperature upon varying spark ignition timing, airfuel ratio, compression ratio, and different compositions of butane and propane. Engine power and exhaust temperature were not influenced by various butane/propane fuel compositions. Finally, among the parameters studied in this investigation, spark ignition timing is one of the most important in reducing exhaust gas temperature.
A Study on Evaporative Emissions in a Spark Ignition Engine with a Carbon Canister
Park, Gyeung-Ho,Cho, Gyu-Sang The Korean Society for Energy 2004 에너지공학 Vol.13 No.2
Evaporative emissions from gasoline powered vehicles continue to be a major concern. The performance of carbon canister in evaporative emission control systems has become an important aspect of overall fuel system development and design. A vehicle's evaporative emission control system is continuously working, even when the vehicle is not running, due to generation of vapors from the fuel tank during ambient temperature variations. In this study, the effects of evaporative emissions on the engine performance were investigated. The experimental results show the effectiveness of this system for future exhaust emissions and enhanced evaporative emissions. This paper discusses the evaluation on the relationship between carbon canister condition and engine performance while engine is running.
수소첨가에 따른 직분식 디젤기관에서의 연소 및 스모크특성에 관한 연구
최경호(Gyeung Ho Choi) 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.1
The combustion and smoke emission of an indirect injection diesel engine Were investigated running the engine on Hydrogen/diesel fuels. Hydrogen fuel supplied to the intake pipe was varied 0 to 10 percent of DF2`s heating value. The most important finding was that the smoke emission is not decreased with increase of hydrogen fuel supplement. Also, the ignition delay is almost negligible over 10 percent hydrogen fuel mixture.
Development and performance analysis of a Miller cycle in a modified using diesel engine
Choi, Gyeung-Ho,Poompipatpong, Chedthawut,Koetniyom, Saiprasit,Chung, Yon-Jong,Chang, Yong-Hoon,Han, Sung-Bin The Korean Society for Energy 2008 에너지공학 Vol.17 No.4
The objective of the research was to study the effects of Miller cycle in a modified using diesel engine. The engine was dedicated to natural gas usage by modifying pistons, fuel system and ignition systems. The engine was installed on a dynamometer and attached with various sensors and controllers. Intake valve timing, engine speed, load, injection timing and ignition timing are main parameters. The results of engine performances and emissions are present in form of graphs. Miller Cycle without supercharging can increase brake thermal efficiency and reduce brake specific fuel consumption. The injection timing must be synchronous with valve timing, speed and load to control the performances, emissions and knock margin. Throughout these tested speeds, original camshaft is recommended to obtain high volumetric efficiency. Retard ignition timing can reduce $NO_x$ emissions while maintaining high efficiency.
Park, Gyeung-Ho,Han, Sung-Bin,Chung, Yon-Jong The Korean Society of Mechanical Engineers 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.8
The concept of hydrogen enriched LPG fuelled engine can be essentially characterized as low emissions and reduction of backfire for hydrogen engine. The purpose of study is obtaining low-emission and high-efficiency in LPG engine with hydrogen enrichment. In order to determine the ideal compression ratio, a variable compression ratio single cylinder engine was developed. The objective of this paper is to clarify the effects of hydrogen enriched LPG fuelled engine on exhaust emission, thermal efficiency and performance. The compression ratio of 8 was selected to minimize abnormal combustion. To maintain equal heating value, the amount of LPG was decreased, and hydrogen was gradually added. In a similar manner, the relative air-fuel ratio was increased from 0.8 to 1.3 in increment of 0.1, and the ignition timing was controlled to be at MBT each case.