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김홍진(H. J. Kim),이태희(T. H. Lee) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
For the track racing bicycle for the elite athletes, the lateral stiffness is more important than the vertical stiffness because torque from pedaling is absorbed by the flexible frame. Due to the trust structure of bike frames, vertical stiffness is high enough regardless of the materials. However, lateral stiffness of frames is not easy to increase. Carbon composite is correct material for the track bike frames since the composite is stronger and stiffer and lighter based on the same weight as the other materials. To increase the lateral stiffness of carbon frames for the professional riders, we increase the packing pressure in the air bladder up to 30bar, which is three times higher than traditional procedure. The results of the approach is right because the specimen of higher pressure is more stiff than that of lower pressure. The illumination of surface as well as the stiffness is proportional to the packing pressure in the bladder.
FDS_EVAC에 적용된 독성가스모델(FED)이 피난에 미치는 영향 분석 및 개선에 대한 연구
김홍진(H.J. Kim),배승용(S.Y. Bae),ANDRAY BURAKOV,최영기(Y.K. Choi),유홍선(H.S. Ryou) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
When fire occurs, the evacuation of human is very important. However, it is very difficult to evacuate human because of heat, toxic gas and smoke by fire. Especially toxic gas is important factor because it is significant parameter of death of evacuees. The effect of toxic gas which effects human motion is calculated using Purser’s Fractional Effective Dose(FED). The FDS_EVAC is used for evacuation. However, FED of FDS_EVAC has some problem of application because it dose not considers evacueess gender and age groups but using single subject. In this study, numerical analysis using modified FED which considers gender and age group of evacuees was performed. We investigate the effect of improved FED on the evacuation. We applied evacuation analysis to exhibition centre where the evacuees was set one thousand people. The FED is increasing with children 3%, male 26%, female 5%, adult 24% and elderly people 30%. Fatality is increasing due to increased FED.
알루미늄 복합 외장재를 사용한 고층 건축물의 외기 풍속, 풍향 변화가 화염전파에 미치는 영향에 대한 수치해석 연구
김홍진(H.J. Kim),배승용(S.Y. Bae),최영기(Y.K Choi),유홍선(H.S. Ryou) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
The aluminum composite panel are widely used for the external materials of high rise building because of well insulation of heat and sound, and improved Constructability. However, the polyethylene in main material of the aluminum composite panel shows weakness in thermal and fire resistances. For this reason, flame is spread more quickly when the fire break out. Therefore, the potentiality of fire spread to the exterior wall is high due to difficulty of early extinguishment and effect of external air. In this study, numerical investigation was performed by using FDS program for flame spread characteristics with various external air velocity and direction in ten-story building with the aluminum composite external materials. As a result, the flame spread velocity is 0.134㎧ and it takes 224 seconds for flames to spread to the 10th floor without external air velocity. however, the flame spread velocity decreases 40% and it takes 348 seconds for flames to spread to the 10th floor when external air velocity is 2.5 ㎧. and air direction is little effect compared to air velocity.
댐퍼 위치가 구획문의 유동분포에 미치는 영향에 관한 수치해석 연구
문효준(H.J. Moon),김홍진(H.J Kim),Andrey Burakov,고권현(G.H. Ko),유홍선(H.S. Ryou) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
The pressurized smoke control system is important for fire safety in building because it is directly concerned with egress time of people. Even though the damper plays an essential role in the pressurized smoke control system, the research for a position of damper effects on distribution of air flow at the compartment door is not performed. In this study, numerical simulation using FDS 5.0 was carried out to analyze the effect of the position of damper on flow distribution at the compartment door. To simulate real situation, effects of opening and closing of compartment door was considered. When the damper is on the opposite wall of the compartment door, the back flow to the lobby is large compared to the two other cases of damper position.
이종화,김홍진,배효원,Lee C. H.,Kim H. J.,Bae H. W. 한국응용곤충학회 1978 한국식물보호학회지 Vol.17 No.3
가. 인삼의 모잘록병을 방제하기 위하여 10종의 약제를 공시하여 실내 및 포장시험을 실시하였다. 나. 공시약제의 효과를 조사하기 위하여 실내에서 토양관법으로 그리고 포장에서는 모잘록병균을 인위적으로 접종한 균포와 자연발병상태의 균포에서 종자소독, 토양소독, 토양관주법으로 처리하였던 바, 다. 모잘록병 방제를 위해 기대되는 약제로는 Homai, Captan, Validamycin, Tachigaren등이 있다. 1. The trials were planned to test ten different fungicides for the control of ginseng damping off Caused by Rhizoctonia solani in the laboratory and in the field. 2. Fungicidal activity was tested by soil drenching in test tube in the laboratory and with seedlings in t he seedbed naturally and artificially infested with damping-off organisms. 3. Promising chemicals to control damping-off of ginseng without marked phytotoxicity were Homai, Captan, Validamycin and Tachigaren.