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RISS 인기검색어
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- 저자 : 채희홍(蔡熙弘) (검색결과 4 건)
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채희홍,임종한 한국인터넷방송통신학회 2012 한국인터넷방송통신학회 논문지 Vol.12 No.3
최근 심각한 차대 보행자의 교통사고로 인명피해가 발생함에도 불구하고 사고원인에 대한 과학적으로 정확히 규명하지 못해 사고처리에 대한 논쟁이 끊임없이 발생하여 경제적 손실 및 정신적 고통이 가중되고 있다. 본 연구에서는 차대보행자의 교통사고분석을 위해 객관적인 교통사고관련 물적 증거자료를 토대로 차량공학, 주행역학), 충돌역학, 교통 및 도로공학 등을 검토하였고, PC-Crash 프로그램을 이용하여 충돌전 차량의 충돌초기속도, 진행궤적 및 충돌자세, 충돌전후속도, 충돌지점 등의 인자를 적용한 결과를 얻어 교통사고의 원인을 분석하였다. 그 결과로 스키드마크 및 보행자 충돌속도는 이론값과 비교할 때 각각 11.2%, 2.27%의 오차를 얻었다. In spite of serious injuries caused by traffic accidents of car-pedestrian, the dispute is constantly occurring and economic losses and mental suffering is escalating since the cause of accidents is not scientifically identified. This study reviewed vehicle dynamics, driving dynamics, collision dynamics, traffic and road engineering for traffic accidents analysis based on traffic accidents related physically objective evidence and analysed the cause of accidents by getting results which applied vehicle initial collision velocity before collision, processing trajectory, collision stance, vehicle velocity before & after collision and parameter by using PC-Crash program. I found that skid mark and collision velocity of car-pedestrian had the error of 11.2%, 2,27% compared to theoretical values.
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PECS 구동 조건 선정을 위한 원자로 공동 환경 특성 평가
채희홍,허장욱 한국에너지학회 2023 에너지공학 Vol.32 No.3
The damage caused by the Fukushima nuclear accident caused by the Great East Japan Earthquake suggested a new direction for the global re-examination of nuclear power plant safety and nuclear safety regulations in each country. In particular, the prevention and mitigation standards for severe accident that corresponding to Beyond-DBA(Beyond-Design Basis Accident) have been raised, and new regulatory standards and guidelines have been prepared. In order to successfully cool the core melt discharged to the outside of the RPV(Reactor Pressure Vessel). PECS(Passive Ex-vessel corium retaining and cooling system) including the core catcher, which is a dedicated facility for severe accident mitigation shall be properly activated. In this paper, the environmental conditions of the severe accidents are analyzed as well as the set point for the actuation signal of PECS is evaluated for the reliability of the passive system in contrast to the existing method.
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코어캐처 노심용융물 차단설비 적용을 위한 MCCI 해석적 연구
채희홍,허장욱 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.6
MCCI, one of the ex-vessel phenomena during a severe accident, is generally caused by mutual reactions between molten core and reactor building basemat concrete, but occurs between sacrificial materials made by concrete and corium in APR nuclear power plant with PECS applied. In this paper, MCCI analysis was performed to design and apply a device to block the core melt at the junction connected to the ICI cavity sump from the core catcher installed in the reactor cavity of the APR. Unlike the sacrificial material, which has a cooling effect by inducing erosion of the ex-vessel core melt, the device is composed of concrete applied as a barrier to protect the ICI cavity sump. The decent thickness of the barrier wall of the device was calculated.
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