• Journal of the Korean Data and Information Science Society
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• 제16권2호
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• pp.359-369
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• 2005

Central limit theorem is known as one of the most important limit theorem in statistics and probability. This paper provides a dynamic MS Excel program that demonstrates computer simulation of various types of central limit theorems. Our result will be of great use for better understanding of central limit theorems.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.513-516
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• 2008

The development of crash cushions is finally completed by full-scale vehicle crash tests. Since the current development of crash cushions is achieved by numerous repeated full-scale vehicle crash tests based on empirical and irrational methods, it requires a great amount of costs. In this research, the more rational procedure based on prototype design by static tests and computer simulation is suggested and it can minimize the number of full-scale vehicle crash tests.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 1997년도 추계학술대회논문집; 한국과학기술회관; 6 Nov. 1997
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• pp.250-255
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• 1997

The computer simulation and mock-up test are recently applied to the practical design for the room acoustics to predict and evaluate its characteristics. In this paper, the sound field properties predicted and evaluated by the computer simulation were compared to the measured data. Comparison and analysis between simulation data and measured data were performed for the Reverberation Time, Sound Pressure Level at the various measuring positions and frequencies and Definition, Early Decay Time, Speech Transmission Index.

• 한국시뮬레이션학회논문지
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• 제8권4호
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• pp.33-51
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• 1999

In this study, the system level network simulation is considered with adaptive array antenna in CDMA mobile communication system. A network simulation framework is implemented based on IS-95A/B system to consider dynamic handoff, system level network behavior, and deploying strategy into the overall CDMA mobile communication network under adaptive array algorithm. Its simulation model, such as vector channel model, adaptive beam forming antenna model, handoff model, and power control model, are described in detail with simulation block. In order to maximize SINR of received signal at antenna, Maximin algorithm is particularly considered, and it is computed at each simulation snap shot with SINR based power control and handoff algorithm. Graphic user interface in this system level network simulator is also implemented to define the simulation environments and to represent simulation results on real mapping system. This paper also shows some features of simulation framework and simulation results.

• 한국생산제조학회지
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• 제21권2호
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• pp.259-266
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• 2012

In this study, the temperature distributions are analyzed on the air flow according to the position of fan inside computer main frame by CFD simulation. In case that ventilation hole is existed at the side of computer frame, the air with lower temperature can be circulated near CPU radiant thermal panel. In case of installation with fan at the side panel, the temperature of air flow becomes lowest. The efficiency of thermal emission at personal computer and its durability can be improved by releasing a lot of heat at air flow effectively inside computer frame according to this simulation result.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2012년도 추계학술대회
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• pp.378-381
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• 2012

최근 응용과학 분야에서 복잡한 공학문제를 해결하기위해 수학적 모델링과 컴퓨터 시뮬레이션의 이용 빈도가 점점 증가함에 따라, 연구자들이 보다 쉽고 편리하게 시뮬레이션 기반의 연구를 수행할 수 있는 시뮬레이션 프레임워크의 필요성이 증대되고 있다. 시뮬레이션 프레임워크는 전처리기, 해석 코드, 가시화 프로그램, 계산 자원 및 작업관리기와 같은 다양한 컴포넌트들로 구성된다. 하지만, 현재까지는 시뮬레이션 프레임워크 컴포넌트들의 표준화된 스키마 및 인터페이스 규칙이 없기 때문에 범용적인 시뮬레이션 프레임워크의 구성이 어렵다. 즉, 대부분의 기존 시뮬레이션 프레임워크는 특정 해석 코드에 종속되어 제한적인 기능만을 제공하는 구조이다. 본 논문에서는 계산과학 분야의 다양하고 상이한 해석 코드들을 수용할 수 있는 시뮬레이션 프레임워크 구성을 위한 해석 코드의 메타정보 스키마를 설계하고, 이를 이용한 웹기반 시뮬레이션 수행 환경을 구현한다.

• 한국컴퓨터정보학회논문지
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• 제29권2호
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• pp.61-66
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• 2024

본 연구에서는 강화학습 기술을 이용하여, 시뮬레이션이나 게임 환경 내에서 개체의 경로 탐색을 위한 시뮬레이션을 개발하는 것을 목표로 한다. 본 연구에서는 주어진 트랙 위에 생성된 임의 위치의 장애물을 회피하고, 아이템을 획득할 수 있는 경로를 자동으로 탐색할 수 있도록 시뮬레이션 내 개체를 학습시킨 점이 주된 특징이다. 해당 시뮬레이션을 구현하기 위해 유니티 게임 엔진에서 제공하는 ML 에이전트 (Machine Learning Agents)를 사용하였고, PPO(Proximal Policy Optimization)에 기반을 둔 학습 정책을 수립하여 강화학습 환경을 구성한다. 본 논문에서 제안한 강화학습 기반의 시뮬레이션을 통해, 개체가 학습을 진행할수록 장애물을 회피하고, 아이템을 획득할 수 있는 경로를 탐색해 트랙 위를 움직이고 있다는 점을 시뮬레이션 결과와 학습 결과 그래프를 분석하여 확인할 수 있다.

• 산업경영시스템학회지
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• 제1권1호
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• pp.49-53
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• 1978

Yet objective of this paper to spell out in detail the relationship between factors design techniques of data analysis and the design of simulation model of the management organization. Yet an organization is more than a collection of individuals. It is something more than the sum of its Parts: it exists as an entity with its own definable objectives. The management process comprise those activities or functions that managers must perform to effectively carry out this asizned role. However, now that O.R. and system approach has been generalized and the assembly system of hard ware or soft ware through computerization is being improved, the systematization of scientific organization is urgently needed. This paper is to set forth :he problem and solution which are most fit for the management organization in relation to computer. Procedure developed are : 1. Interpretation of the management organization. 2. Design of the computer simulation. 3. Application.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.916-919
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• 2004

In this paper, we proposed a new method of pre-operative planning for tibial deformity correction using double hexapod external fixator in pseudoacondroplasia. The 3-D computer graphic model of deformed tibia was reconstructed from 3 mm sliced CT data, and CAD model of double hexapod external fixator was developed. The fixator was composed of 170 mm diameter of three rings and 90 mm of twelve struts. The bone deformities and the osteotomy lines for double osteotomy were measured using X-rays, and the necessary joint values to correct the given deformities were obtained by inverse kinematics analysis. The computer graphic simulation was performed to visualize the deformity correction process and evaluate the analysis result. By examining the pre-op and post-op X-rays, the simulation result was in good agreement with the clinical outcomes.

• 환경위생공학
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• 제13권2호
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• pp.66-75
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• 1998

The computer simulation model was used to forecast the concentrations of COD$_{cr}$, NH$_{4}$$^{+}$-N and NO$_{3}$$^{-}$-N in each reactors. In the biological wastewater treatment system, the computer simulation model was used to observe the behavior of pollutants especially. In this research, effect of SRT, feeding pattern and recirculation rate on UCT(University of Cape Town) process was evaluated by computer simulation model. T-N removal was affected to the SRT. SRT for effective T-N removal was 15 days or longer. Feeding pattern in UCT process was affected to the T-N removal. Feeding pattern which 100% loading to the first reactor was most effective for T-N removal. The effect of recirculation rate was clear for T-N removal. The recirculation from anoxic reactor to anaerobic reactor was not need but the recirculation from oxic reactor to anoxic reactor was need. In aspect of nitrogen removal efficiency, A/O process was higher than UCT process.