• 한국응급구조학회지
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• 제14권2호
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• pp.25-40
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• 2010

Purpose : The purpose of this study was to develop and apply a Core Skill-TLP(Core Skill-Tutorial, Laboratory, Practicum) package in Patient Management and to effect of core skill-TLP education. Methods : This study was used to developed Patient Management' Core Skill-TLP package throughout 14 steps of Core Skill-TLP package development model. Then, Core Skill-TLP Learning methodology was implemented in first year student in the undergraduate emergency medical technology, and survey was done. Results : 1. Core Skill-TLP package model was presented based on conceptual model of PBL(S-PBL). 2, The student in OSCE did significantly better in clinical patient management core skills performance. 3. As to the satisfaction of Core Skill-TLP package management, student, tutor and self-satisfaction score was 3.21, 3.42, 3.38 respectively. Conclusion : This study was suggested that Core Skill-TLP education would be necessary with well-structured package and achieved advantage of simulation and PBL.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2002년도 춘계학술대회논문집
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• pp.67-71
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• 2002

본 논문에서는 many-to-many IP 멀티캐스팅을 위한 효율적인 BCT(Backbone Core Tree)생성 알고리즘의 시뮬레이션 방법에 대하여 제안한다. BCT는 기법은 CBT(Core Based Tree)에 기반을 두고 있다. CBT는 공유 트리를 이용하여 멀티캐스트 자료를 전달하기 때문에 Source based Tree에 비하여 각 라우터가 유지해야 하는 상태 정보의 양에 적고, 적용하기 간단하지만, Core 라우터 선택의 어려움과 트래픽이 Core로 집중되는 문제점을 가지고 있다. 이에 대한 보완책으로 BCT기법이 제안되었는데, 본 논문에서는 주어진 네트워크 위상 그래프에서 최소신장 트리를 만들고, 센트로이드(Centroid)를 이용하여 효율적인 BCT를 생성하는 알고리즘을 제안하고 시뮬레이션 방법을 제시한다.

• 한국인터넷방송통신학회논문지
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• 제16권2호
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• pp.157-163
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• 2016

비대칭적 멀티코어 프로세서 구조의 성능을 분석하기 위하여 명령어 트레이스 모의실험이나 실행 위주 모의실험을 이용하는 경우, 시간이 과다 소요되고 대량의 데이터 저장 공간을 차지하는 문제점이 있다. 본 논문에서는 통계적 모의실험에 의하여 다양한 하드웨어의 사양을 갖는 비대칭적 멀티코어 프로세서의 성능을 측정하는 기법에 대하여 연구하였다. 이것을 위하여 SPEC 2000 벤치마크 프로그램의 특성을 통계적 프로화일링 기법으로 모델링하고, 여기서 얻은 통계적 프로화일을 바탕으로 벤치마크 트레이스를 합성하여 비대칭적 멀티코어 프로세서에 대한 모의실험을 수행하였다. 그 결과, 통계적 모의실험에 의하여 측정한 성능이 명령어 트레이스 모의실험에 의하여 측정한 성능에 근접한 결과를 가져왔으며, 모의실험 시간을 크게 단축시켰다.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1996년도 춘계학술발표회논문집(1)
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• pp.88-93
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• 1996

The initial condition should be consistent with real reactor core state for the simulation of the core transient. The initial xenon distribution, which cad not be measured in the core, has a significant effect on the transient with xenon dynamics of PWR. In the simulation of the transient stating from non-equilibrium xenon state, the accurate initialization of the non-equilibrium xenon distribution is essential to predict the core transient behavior. In this study, the xenon initialization method to predict the core transient more accurately was developed through the first-order perturbation theory of the relationship between simulated power and measured power distribution and verified by the application of the simulation for a startup test of Yonggwang Unit 3.

• International Journal of Naval Architecture and Ocean Engineering
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• 제9권4호
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• pp.446-459
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• 2017

Naval ships are assigned many and varied missions. Their performance is critical for mission success, and depends on the specifications of the components. This is why performance analyses of naval ships are required at the initial design stage. Since the design and construction of naval ships take a very long time and incurs a huge cost, Modeling and Simulation (M & S) is an effective method for performance analyses. Thus in this study, a simulation core is proposed to analyze the performance of naval ships considering their specifications. This simulation core can perform the engineering level of simulations, considering the mathematical models for naval ships, such as maneuvering equations and passive sonar equations. Also, the simulation models of the simulation core follow Discrete EVent system Specification (DEVS) and Discrete Time System Specification (DTSS) formalisms, so that simulations can progress over discrete events and discrete times. In addition, applying DEVS and DTSS formalisms makes the structure of simulation models flexible and reusable. To verify the applicability of this simulation core, such a simulation core was applied to simulations for the performance analyses of a submarine in an Anti-SUrface Warfare (ASUW) mission. These simulations were composed of two scenarios. The first scenario of submarine diving carried out maneuvering performance analysis by analyzing the pitch angle variation and depth variation of the submarine over time. The second scenario of submarine detection carried out detection performance analysis by analyzing how well the sonar of the submarine resolves adjacent targets. The results of these simulations ensure that the simulation core of this study could be applied to the performance analyses of naval ships considering their specifications.

• 한국인터넷방송통신학회논문지
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• 제12권3호
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• pp.9-13
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• 2012

최근에 이르러, 과거 수퍼스칼라 프로세서의 하드웨어 복잡도와 전력소모 문제를 극복하기 위하여 멀티코어 프로세서가 상용화 되어 널리 이용되고 있다. 이러한 멀티코어 프로세서의 설계 초기 단계에서는 광범위한 모의실험을 수행하는 것이 매우 중요하다. 그러나 기존의 실행 위주(execution-driven)의 멀티코어 프로세서 모의실험기는 속도가 느리다는 단점이 있다. 본 논문에서는 이것을 극복하기 위하여 빠른 속도를 갖는 명령어 자취형 (trace-driven) 멀티코어 프로세서 모의실험기를 개발하였으며, 이것을 이용하여 2 개에서 16 개까지의 멀티코어 프로세서에 대하여 SPEC 2000 벤치마크를 입력으로하여 모의실험을 수행하였다. 모의실험 결과, 16개의 코어를 이용하는 멀티코어 프로세서에서 평균 4.1 IPC의 성능과 단일코어 대비 13.3 배의 성능 향상을 기록하였다.

• 부모자녀건강학회지
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• 제16권1호
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• pp.37-44
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• 2013

Purpose: The purpose of this study is to analyze the effectiveness of maternity nursing education-knowledge, skills and attitude among the third year students who have completed maternity nursing, practice at the college, clinical practice and core skill practicum. Methods: This is the descriptive research to verify the effectiveness of simulation-based practice education for core skill of maternity nursing. Third year nursing students who have completed maternity nursing related theories and practice have been selected as population. Total of 202 surveys have been used for analysis. Data analysis is done by using SPSS/WIN 18.0. Results: Self-confidence of core skill in maternity nursing is experimental group 4.52 and control group 4.37 score (p<.05). Performance competence in childbirth care is experimental group 4.53 and control group 4.35 score (p<.05). The students who have maternity nursing related clinical practice and core skill practicum experience show high core skill evaluation score. Conclusion: Therefore, it is recommended that current maternity nursing core skill curriculum should be reviewed and improved, and the students should be provided variety of simulation techniques to gain essential knowledge and core nursing skills.

• Nuclear Engineering and Technology
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• 제52권5호
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• pp.878-888
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• 2020

This paper presents the validation of UNIST in-house Monte Carlo code MCS used for the high-fidelity simulation of commercial pressurized water reactors (PWRs). Its focus is on the accurate, spatially detailed neutronic analyses of startup physics tests for the initial core of the Watts Bar Nuclear 1 reactor, which is a vital step in evaluating core phenomena in an operating nuclear power reactor. The MCS solutions for the Consortium for Advanced Simulation of Light Water Reactors (CASL) Virtual Environment for Reactor Applications (VERA) core physics benchmark progression problems 1 to 5 were verified with KENO-VI and Serpent 2 solutions for geometries ranging from a single-pin cell to a full core. MCS was also validated by comparing with results of reactor zero-power physics tests in a full-core simulation. MCS exhibits an excellent consistency against the measured data with a bias of ±3 pcm at the initial criticality whole-core problem. Furthermore, MCS solutions for rod worth are consistent with measured data, and reasonable agreement is obtained for the isothermal temperature coefficient and soluble boron worth. This favorable comparison with measured parameters exhibited by MCS continues to broaden its validation basis. These results provide confidence in MCS's capability in high-fidelity calculations for practical PWR cores.

• Nuclear Engineering and Technology
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• 제55권9호
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• pp.3388-3400
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• 2023

Detailed analysis of the neutron pathway through matter inside the nuclear reactor core is exceedingly needed for safety and economic considerations. Due to the constant development of high-performance computing technologies, neutronics analysis using computer codes became more effective and efficient to perform sophisticated neutronics calculations. In this work, a commercial pressurized water reactor (PWR) presented by Virtual Environment for Reactor Applications (VERA) Core Physics Benchmark are modeled and simulated using a high-fidelity simulation of OpenMC code in terms of criticality and fuel pin power distribution. Various problems have been selected from VERA benchmark ranging from a simple two-dimension (2D) pin cell problem to a complex three dimension (3D) full core problem. The development of the code capabilities for reactor physics methods has been implemented to investigate the accuracy and performance of the OpenMC code against VERA SCALE codes. The results of OpenMC code exhibit excellent agreement with VERA results with maximum Root Mean Square Error (RMSE) values of less than 0.04% and 1.3% for the criticality eigenvalues and pin power distributions, respectively. This demonstrates the successful utilization of the OpenMC code as a simulation tool for a whole core analysis. Further works are undergoing on the accuracy of OpenMC simulations for the impact of different fuel types and burnup levels and the analysis of the transient behavior and coupled thermal hydraulic feedback.

• Nuclear Engineering and Technology
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• 제27권6호
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• pp.853-858
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• 1995

노심 천 이 현상의 모사계산을 위해서는 노심상태 의 초기조건을 실제노심과 일치시켜야 하는데 특히, 제논동특성이 관심의 대상이 되는 천이현상에 있어서는 직접적인 추정이 불가능한 노심내 제논분포의 초기상태가 천이현상의 해석결과에 커다란 영향을 미치게 된다 초기상태의 노심이 정확히 제논 평형상태에 있지 않는 경우 노심의 시간에 따른 변화를 잘 예측하기 위해서는 비평형 제논분포를 모사하는 초기화가 필수적이다. 본 연구에서는 천이현상 이전에 관측된 비평형 제논진동을 등가 제논진동으로 모사하여 천이현상을 보다 정확히 예측할 수 있는 제논 초기화 기법을 개발하였으며 영광 3, 4호기 시운전 시험에서 입수된 실측자료를 통하여 그 적용성을 입증 하였다.