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박호진,신영섭,차한,김화자 대한소화기내시경학회 1990 Clinical Endoscopy Vol.11 No.1
A 4 years and 8 months old girl had accidentally swallowed coins while playing on sofa. She immediately complained of a painful sensation in her throat and chest. Radiograph of the chest at a local clinic showed the coins located at the gastroesophageal junction. She was admitted to our hospital 24 hours after the accident, when her physical examinatioa was normal and the coins failed to be moved. One hour thereafter, two coins(500 won and 50 won) were dislodged from the gastroesophageal junction witb biopsy forceps:on gastroendoscope (Olympus GIF-Q10). The following day, she was discharged without complicaitions.
Uncertainty Propagation Analysis for Yonggwang Nuclear Unit 4 by McCARD/Master Core Analysis System
박호진,이동혁,심형진,김창효 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.3
This paper concerns estimating uncertainties of the core neutronics design parameters of power reactors by direct samplingmethod (DSM) calculations based on the two-step McCARD/MASTER design system in which McCARD is used to generatethe fuel assembly (FA) homogenized few group constants (FGCs) while MASTER is used to conduct the core neutronicsdesign computation. It presents an extended application of the uncertainty propagation analysis method originally designed foruncertainty quantification of the FA FGCs as a way to produce the covariances between the FGCs of any pair of FAs comprisingthe core, or the covariance matrix of the FA FGCs required for random sampling of the FA FGCs input sets into direct samplingcore calculations by MASTER. For illustrative purposes, the uncertainties of core design parameters such as the effectivemultiplication factor (keff), normalized FA power densities, power peaking factors, etc. for the beginning of life (BOL) core ofYonggwang nuclear unit 4 (YGN4) at the hot zero power and all rods out are estimated by the McCARD/MASTER-basedDSM computations. The results are compared with those from the uncertainty propagation analysis method based on theMcCARD-predicted sensitivity coefficients of nuclear design parameters and the cross section covariance data.
Monte Carlo burnup and its uncertainty propagation analyses for VERA depletion benchmarks by McCARD
박호진,이동혁,전병규,심형진 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.7
For an efficient Monte Carlo (MC) burnup analysis, an accurate high-order depletion scheme to considerthe nonlinear flux variation in a coarse burnup-step interval is crucial accompanied with an accuratedepletion equation solver. In a Seoul National University MC code, McCARD, the high-order depletionschemes of the quadratic depletion method (QDM) and the linear extrapolation/quadratic interpolation(LEQI) method and a depletion equation solver by the Chebyshev rational approximation method (CRAM)have been newly implemented in addition to the existing constant extrapolation/backward extrapolation(CEBE) method using the matrix exponential method (MEM) solver with substeps. In this paper, thequadratic extrapolation/quadratic interpolation (QEQI) method is proposed as a new high-order depletionscheme. In order to examine the effectiveness of the newly-implemented depletion modules inMcCARD, four problems in the VERA depletion benchmarks are solved by CEBE/MEM, CEBE/CRAM, LEQI/MEM, QEQI/MEM, and QDM for gadolinium isotopes. From the comparisons, it is shown that the QEQI/MEM predicts kinf's most accurately among the test cases. In addition, statistical uncertainty propagationanalyses for a VERA pin cell problem are conducted by the sensitivity and uncertainty and the stochasticsampling methods.
박호진,박광로,Park, H.J.,Park, K.R. 한국전자통신연구원 2006 전자통신동향분석 Vol.21 No.5
향후 인터넷 기반 애플리케이션에는 확장성, 보안 및 신뢰성, 새로운 서비스에 대한 유연성 및 QoS 등의 요구사항이 제시된다. 기존 클라이언트-서버 방식에서 이러한 요구사항의 만족을 위해서는 복잡성 및 고비용 문제가 제기된다. 반면, 모든 형태의 분산 자원 접근이 가능한 P2P 통신 방식에서는 보다 간단한 해결방안을 제시함으로써 인터넷기반 애플리케이션에 새로운 가능성을 제시하고 있다. 본 고에서는 P2P 기술에 대한연구 개발 및 응용 서비스 동향에 대해여 소개한다. 또한 유비쿼터스 환경에서 P2P 기술의 역할 및 해결되어야 할 문제점에 대해서 정리하고, 실제 P2P를 이용한 유비쿼터스홈 구축 모델을 제시한다. 마지막으로 향후 P2P 요소 기술 및 응용서비스 발전 전망에 대해 간략히 살펴본다.