http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
샌드위치 가압방식 제연설비의 성능확보 방안에 관한 연구
김희문(Hee-Moon Kim),최한빛(Han-Bit Choi),최돈묵(Don-Mook Choi) 한국화재소방학회 2024 한국화재소방학회논문지 Vol.38 No.1
본 연구는 샌드위치 가압방식의 성능검증 방법이 체계적이지 않은 국내 상황에 검증 방안을 제시하고자 한다. 검증 방법은 4가지 방식인 T.A.B, hot smoke test, FDS를 통한 화재시뮬레이션, Pathfinder를 통한 피난 시뮬레이션을 수행하였다. T.A.B, 화재 및 피난 시뮬레이션에서 문제점은 없는 것으로 판단되었다. 그러나 hot smoke test에서는 직상층 직하층 모두 연기 유동을 하는 양상을 보여주었다. 실질적으로 피난 시뮬레이션 까지 수행하여 피난안전성 평가를 검증하여 안전한 것으로 판단되나 hot smoke test를 통해 연기 유입이 되면서 샌드위치 가압방식에 대한 보완 사항을 확인하게 되었다. 이처럼 T.A.B와 화재 및 피난 시뮬레이션과 더불어 hot smoke test를 통해 샌드위치 가압방식에 대한 성능 검증 기준을 기여할 수 있을 것으로 기대된다. This study aims to outline a verification plan for domestic scenarios using the sandwich pressurization method. Weemployed four methods: T.A.B, hot smoke test, FDS, and pathfinder. T.A.B and fire and evacuation simulation did notexhibit any issues. However, the smoke flow was observed in both the upper and lower layers during the H.S.T. Evacuationsafety was confirmed through simulation, including the adequacy of the procedure. Nonetheless, the introduction of smokein the hot smoke test highlighted the need for enhancements to the sandwich pressurization method. Consequently, the hotsmoke test, alongside T.A.B and fire and evacuation simulations, will enhance verification standards for the sandwichpressurization method.
이철희 ( Chul Hee Lee ),김희문 ( Hee Moon Kim ),신선희 ( Seon Hee Shin ),성태정 ( Tae Jung Sung ),김성구 ( Sung Goo Kim ),이건희 ( Kon Hee Lee ) 대한주산의학회 2007 Perinatology Vol.18 No.3
Intrauterine fracture in a neonate is rare but can occur without trauma to the mother and can be caused by genetic factor or external pressure or skeletal disorder. Authors experienced a case of intrauterine femur fracture in a female premature patient which was discovered at birth. The patient was born at 28+3 weeks by a cesarean section. Her birth weight was 900g. Amniotic fluid was clear and there was no amniotic membrane adhesion. The mother was 31 years old and had preeclampsia but had no other previous medical history. She had no experience of trauma in daily activities and abnormal findings during antenatal care. On x-ray finding taken after birth, there was callus formation at the epiphysis of the right distal femur. We found no shortening of the limbs during physical examination of the neonate but there were edematous change at the distal portion of the right thigh She had no neurologic abnormality. We report a case of intrauterine femur fracture with no special history in the mother.
리액터에 의한 가변주파수 구동장치의 고조파저감효과 분석
김덕기,윤경국,김희문,Kim, Deok-Ki,Yoon, Kyoung-Kuk,Kim, Hee-Moon 해양환경안전학회 2015 海洋環境安全學會誌 Vol.21 No.6
본 논문에서는 전동기 구동장치를 선정하여 리액터 용량 및 종류, 부하의 크기에 따라 고조파 왜형률 변화추이를 검토하여 선박 및 해양플랜트에 적용 가능한 최적의 용량선정 근거를 마련하였다. AC라인 리액터와 DC링크 리액터는 가변주파수 구동장치 입력전류의 고조파를 크게 저감시키는 역할을 하며, 동일한 효과를 얻기 위한 DC링크 리액터의 인덕턴스가 AC라인 리액터 인덕턴스의 약 1.7배가 되어야 한다는 것을 시뮬레이션을 통하여 고찰하였다. 소프터웨어 PSIM을 활용하여 각 상황에 따른 전류 고조파 왜형률을 분석하였다. Recently, due to the rapid development of Power Electronics, the usage of Non Linear Load variable frequency drivers (VFDs) is increasing in the electric propulsion vessels and offshore plants. And harmonics which is generated by the variable frequency drives is an important issue should be solved. Ac line reactors and dc link reactors are widely used in variable frequency drives to improve the drive performance such as reducing input current harmonics, elevating input power factor, and protecting the drives from surges, etc. The effectiveness of both types of reactors in reducing input harmonics is affected by the loading of the drives and the system source impedance. And it considered that inductance of DC link reactors should be about 1.7 times of AC line reactors for same effect. The rules to evaluate the needs and effectiveness using ac line or dc link reactors are proposed for practical appications. In this paper, a simulation is performed to investigate of such factors using software PSIM.
DUPIC 핵연료 노내거동 예측을 위한 전산 코드 개발
김희문,박광헌 慶熙大學校 材料科學技術硏究所 1997 材料科學技術硏究論集 Vol.10 No.-
In this study, LWR fuel performance code, FRAPCON-Ⅱ, is used in describing the behavior of CANDU fuels during normal operation. Fission gas release, radial power distribution and gap conductance were modified. Based on the results of simfuel thermal conductivity, DUPIC fuel thermal conductivity turned out to be lower than that of CANDU fuel. The centerline temperature of DUPIC fuel using FRAPCON-Ⅱ code was higher than that of fresh fuel in CANDU by about 300K. DUPIC fuel releases more fission gases than CANDU fuel. DUPIC fuel behavior is affected by the final burnup of LWR fuel. Centerline temperature of DUPIC fuel with extended burnup(50,000 MWd/MTU) in LWR expected to be higher than that of DUPIC feel with standard burnup(33,000 MWd/MTU) in LWR by about 30K.