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원전 생애주기 정보모델 개발을 위한 요구사항 분석에 관한 연구
류동수(Dongsu Ryu),이승훈(Seunghoon Lee),한순흥(Soonhung Han) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.1
50년 이상의 생애주기를 가지고 있는 원자력 발전 플랜트 특성상, 다른 산업분야 보다 상대적으로 긴 생애주기동안 데이터의 관리가 중요하다. 원자력 발전 플랜트와 같은 대형 시스템의 생애주기에는 건설 플래닝, EPC, O&M 단계 각각에 다양한 참여기관이 생기게 되며 생애주기를 지나오며 많은 데이터들이 생성 및 소실 된다. 그렇기 때문에 이들 기간간의 데이터 교환 및 공유의 문제가 발생하게 된다. 이러한 문제를 해결하기 위해 원전 생애주기 정보모델을 개발하여 전 생애주기에 활용할 필요성이 있는데, 본 연구에서는 이러한 원전 생애주기 정보모델 개발을 위한 문제를 정의하고 요구사항 분석에 대해 살펴본다.
류동수(Dongsu Ryu) 한국전산유체공학회 2001 한국전산유체공학회 학술대회논문집 Vol.2001 No.-
Astrophysics has been one of the disciplines which utilize actively supercomputers for their researches. In this paper, studies of astrophysical flows by large scale numerical simulations in supercomputers are discussed. The followings are described: 1) characteristics of astrophysical flows, 2) numerical codes to study astrophysical flows, 3) performance of the codes in parallel supercomputers. A couple of examples of such studies are briefly presented: 1) three-dimensional evolution of the nonlinear Kelvin-Helmholtz instability in a magnetized medium, 2) three-dimensional simulations of astrophysical jets in a magnetized medium.
A Relativistic Magnetohydrodynamic Code Based on an Upwind Scheme
장한별,류동수,Jang, Hanbyul,Ryu, Dongsu 한국천문학회 2012 天文學會報 Vol.37 No.2
Building a relativistic magnetohydrodynamic (RMHD) code based on upwind schemes has been a challenging project, because of the absence of analytic expressions of eigenvalues and eigenvectors. We found analytic expressions of eigenvalues and eigenvectors for adiabatic RMHD flows which are relatively simple and manageable. Especially, our eigenvectors can handle all degenerate points. Using these analytic forms, we built a code based on the total variation diminishing (TVD) scheme, and successfully performed one-dimensional shock tube tests.
Nonlinear evolution of Alfven waves via mode conversion
김경임,이동훈,류동수,김관혁,이은상,Kim, Kyung-Im,Lee, Dong-Hun,Ryu, Dongsu,Kim, Khan-Hyuk,Lee, Ensang 한국천문학회 2012 天文學會報 Vol.37 No.2
It is well known that the FLRs are excited by compressional waves via mode conversion, but there has been no apparent criterion on the maximum amplitude in the regime of linear approximations. Such limited range of amplitude should be understood by including nonlinear saturation of FLRs, which has not been examined until now. In this study, using a three-dimensional magnetohydrodynamic (MHD) simulation code, we examine the evolution of nonlinear field line resonances (FLRs) in the cold plasmas. The MHD code used in this study allows a full nonlinear description and enables us to study the maximum amplitude of FLRs. When the disturbance is sufficiently small, it is shown that linear properties of MHD wave coupling are well reproduced. In order to examine a nonlinear excitation of FLRs, it is shown how these FLRs become saturated as the initial magnitude of disturbances is assumed to increase. Our results suggest that the maximum amplitude of FLRs become saturated at the level of the same order of dB/B as in observations roughly satisfies the order of ~0.01. In addition, we extended this study for the plasma sheet boundary layer (PSBL) region. We can discuss the maximum disturbances of the Alfven via mode conversion becomes differently saturated through each region.
김종수,김봉규,임인성,백창현,남현웅,류동수,강영운,KIM JONGSOO,KIM BONG GYU,YIM IN SUNG,BAEK CHANG HYUN,NAM HYUN WOONG,RYU DONGSU,KANG YOUNG WOON 한국천문학회 2004 天文學論叢 Vol.19 No.1
A high performance computing cluster for astronomical computations has been built at Korea Astronomy Observatory. The 64 node cluster interconnected with Gigabit Ethernet is composed of 128 Intel Xeon processors, 160 GB memory, 6 TB global storage space, and an LTO (Linear Tape-Open) tape library. The cluster was installed and has been managed with the Open Source Cluster Application Resource (OSCAR) framework. Its performance for parallel computations was measured with a three-dimensional hydrodynamic code and showed quite a good scalability as the number of computational cells increases. The cluster has already been utilized for several computational research projects, some of which resulted in a few publications, even though its full operation time is less than one year. As a major resource of the $K^*Grid$ testbed, the cluster has been used for Grid computations, too.
원전 생애주기 정보 관리를 위한 원자력 발전소 분류체계 및 국제 표준 기반 참조 데이터 라이브러리의 구축에 관한 연구
권순조(Soonjo Kwon),이승훈(Seunghoon Lee),이한라(Hanra Lee),류동수(Dongsu Ryu),한순흥(중앙연구원) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2
All life cycle stages of a nuclear power plant can be divided into project planning, design, procurement, construction, and operation & maintenance. At each stage, various types of information is created and handed over to the next stage, and information loss occurs frequently in this hand-over process. It results in additional work and cost in the O&M stage because of the absence of information received from previous stages. Therefore, it is required to manage all the life cycle information without any loss and utilize it effectively in O&M stage. In this study, a plant breakdown structure and a way to build up reference data library based on international standards are proposed to manage all the life cycle information of nuclear power plant efficiently