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김덕한 ( Duck Han Kim ) 한국공업화학회 2013 공업화학전망 Vol.16 No.2
미국의 RFS2와 유럽의 RED를 차질없이 실행시키기 위해서는 바이오연료의 보급 확대가 필수적인 요건이다. 그 중에서도 바이오디젤 보급의 확대는 유럽뿐만 아니라, 아시아 등, 전세계적으로 추진되어야 할 과제로 인식되고 있다. 그러나, 바이오디젤이 연료 특성상 여러 가지 문제점들을 가지고 있음에 따라, 이를 보완할 수 있는 수첨바이 오디젤의 필요성이 대두되고 있으며, 나아가 BTL 기술을 이용한 차세대 바이오디젤의 등장이 필연적으로 요구된다고 할 수 있겠다. 본 고에서는, 기존의 바이오디젤을 대체할 수 있는 이러한 수첨바이오디젤의 개발 및 상업화 현황을 비롯하여, 바이오디젤 제조관련 BTL 기술 개발의 최근 동향을 소개함으로써, 차세대 바이오디젤의 기술개발의 방향을 이해하는데 도움이 되고자 한다.
김덕천(Duck Choun Kim),한철언(Choul Eun Han),손종열(Jong Youl Son),강현민(Hyun Min Kang),하웅용(Woong Young Ha) 한국사회체육학회 1998 한국사회체육학회지 Vol.9 No.-
The purpose of this study was to remove competitive trait anxiety in the scene of sports relation to the improvement of athlete`s shooting performance through mental practice. The result of this study were as follows; First, experimental group maintained stability and consistency in comparison with control group. Second, Experimental group showed higher development than control group in monthly average exercise records.
[가솔린엔진부문] 직접 분사식 가솔린 기관의 실린더 내 분무의 거동
김한재(Han-Jae Kim),류경훈(Kyeong-Hun Ryun),최동석(Dong-Seok Choi),차건종(m Keun-Jong Cha),김덕줄(Duck-Jool Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To achieve the requirement for high fuel economy and low emissions, the research of GDI engines is recently very brisk in the whole world. This study was performed to investigate the spray characteristics within cylinder of optically accessible direct-injected GOI engine. For this study, the conventional MPI, OOHC engine is modified into optically accessible GOI engine. The fluorescence images were captured using exciplex fluorescence method in a motoring engine. Four injection timing were set, namely, A TOC 90 °, BTOC 50 °and BTOC 70 °. The spray structure and penetration in optically accesible engine was influenced by tumble flow in cylinder.
김한재(Han-jae Kim),류경훈(Kyeong-hun Ryu),최동석(Dong-seok Choi),김덕줄(Duck-jool Kim) 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Behaviors of GDI spray for flow and non-flow field were studied using LIEF and PDPA system. Injector has cone spray angle and spray has hollow cone structure. The exciplex system of fluorobenzene and DEMA in a non-fluorescing base fuel of hexane was employed. Droplet size and velocity were also measured by PDPA. From spray images ,sprays could be divided as two regions: cone and mixing region. Large droplets over 40㎛ were distributed outside spray main stream and many fine droplets were distributed inside the spray and vortex region. In engine spray has smaller penetration than chamber while dispersions were almost same at both cases. At mixing region, area ratios of high intensity region in engine were larger and increased rapidly after about 1.0ms after injection.<br/>
최일석,김덕하,한보현 ( Ill Seuk Choi,Duck Ha Kim,Bo Hyun Han ) 대한피부과학회 1988 대한피부과학회지 Vol.26 No.2
Fournier's gangrene is a fulminating gangrene of the male genitalia. It is associated with severe systemic toxic effect and a high motality rate, and it requires early diagnosis and intensive care with surgical intervention. We report a case of Fournier's gangrene in 33-year-old man, who showed marked swelling and necrosis of the scrotum, and extending cellulitis on the right flank and chest. With prompt excision of all the gangrenous scrotal skin and drainage incisions made on the flank and chest, the healing was successful.
연료분무 및 연소 1 : 수첨처리 바이오디젤 성상에 따른 연료 분무특성 비교
오세헌 ( Se Hun Oh ),김덕한 ( Duck Han Kim ),김성환 ( Seong Hwan Kim ),노수영 ( Soo Young No ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
Hydrotreated biodiesel (HBD) would be one of the promising alternative fuels instead of current biodiesel. In this study, Investigation of spray characteristics in terms of spray penetration and spray angle were conducted experimentally including calculated SMDs as well. The ambient pressures of 1, 3, and 5 MPa and injection pressures of 30, 80, and 130 MPa were introduced and the fuels employed were petro-diesel, and 2, 10, 20, 30, and 50 % for hydrotreated biodiesel, respectively. 6 holes of Bosch injector was used for this study with 156 degree of injection angle and 0.120 mm of nozzle diameter. In this study, spray tip penetrations were measured and analyzed between 0.0 ms and 3.0 ms after start of injection. Pictures were taken at every 0.1 ms of time frames. It was difficult to measure spray angles because of low resolution. Thus, spray angles were measured after 0.2 ms of injection. Test result shows that the distinct differences in penetration length among fuels were shown regardless of ambient pressure in the low injection pressure like 30 MPa. At the same injection pressure such as 130 MPa, the spray penetration length at ambient pressure of 1Mpa shows three times higher than that of 5Mpa. Spray tip penetrations were mostly affected by the injection pressure and ambient pressure. Thus, there were little significant differences of spray tip penetrations among test fuels at the same conditions. Nevertheless, the more HBD blended diesel shows relatively shorter penetration length because of lower density than that of petro-diesel. On the contrary, the more biodiesel blended fuel shows the longer penetration length because of higher density than that of petro-diesel. Relatively larger spray angles were observed to the more HBD blended diesel than petro-diesel at the same time frame after injection. The more biodiesel blended diesel shows smaller spray angle as opposed to HBD, because of the difference of their density, kinetic viscosity and surface tension. Spray angle increases appreciably with increase in nozzle diameter, and diminishes with increase in ambient density, liquid viscosity, and injection pressure of liquid. Spray angle decreases with increase in viscosity. Surface tension had no appreciable effect on spray angle. Spray angle widens slightly with increase in density. SMD correlations among surface tensions, densities and viscosities of petro-diesel and HBD blended diesels were calculated by means of two typical numerical equations, which is the regression model developed from the experimental data acquired using Malvern Particle Size Analyzer. The results on SMD can be seen that viscosity has more positive effects than density. Therefore, the more HBD blended fuels were shown the slightly larger SMDs than petro-diesel, because of larger viscosity of HBD than that of petro-diesel. Consequently, this study has found that HBD has a little bit merits and demerits of macro- and microspray patterns compared to petro-diesel.