• Journal of the Korean Society for Precision Engineering
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• v.29 no.4
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• pp.479-486
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• 2012

Two of fundamental approaches that can be used to understand ion-solid interaction are Monte Carlo (MC) and Molecular Dynamic (MD) simulations. For the simplicity of simulation Monte Carlo simulation method is widely preferred. In this paper, basic consideration and algorithm of Monte Carlo simulation will be presented as well as simulation results. Sputtering caused by incident ion beam will be discussed with distribution of sputtered particles and their energy distributions. Redeposition of sputtered particles that are experienced refraction at the substrate-vacuum interface additionally presented. In addition, reflection of incident ions with reflection coefficient will be presented together with spatial and energy distributions. This Monte Carlo simulation will be useful in simulating and describing ion beam related processes such as Ion beam induced deposition/etching process, local nano-scale distribution of focused ion beam implanted ions, and ion microscope imaging process etc.

• Journal of the Korean Society for Railway
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• v.11 no.1
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• pp.95-100
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• 2008

The simulation analysis of fire-driven flow and passenger evacuation in Daegu subway station, Chung-Ang, have been performed. The first location of outbreak of fire is inside passenger car in the third basement in Chung-Aug station, The smoke flow in the second and third basement has been analyzed using FLUENT 6.2. The CO (carbon monoxide) and temperature distribution in the train units and station platform have been obtained and transferred to input data for evacuation simulation. The highest temperature in the train units was 1500k. For the simulation of passenger evacuation, EXODUS has been used for whole basements (level 1${\sim}$level 3) in the station. Total number of people was assumed to be one thousand and 640 were placed inside train and 360 were placed outside train. In evacuation simulation, an average of 135 passengers were killed and an average time to evacuate takes 10min 19sec. The main evacuation routes used by passengers were investigated and the cause of death was identified by evacuation simulation.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.361-362
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• 2008

본 논문은 지능형 로봇의 소프트웨어 컴포넌트의 개발을 위한 시뮬레이션 시스템을 위한 개발 환경을 구현하고자 한다. 개발 환경 설계는 지능형 로봇 시스템에 적합한 컨포넌트를 전문지식 없이도 쉽고 편리하게 작성하고 작성된 컴포넌트의 서비스를 빠르고 쉽게 검증 할 수 있도록 설계하였다.

• Proceedings of the KIPE Conference
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• 2014.11a
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• pp.75-76
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• 2014

This study deals with a isolation type MIC(Module Integrated Converter) for AC module with advantages such as DC Wireless, freely selectable installation capacity, minimized shadow effect etc. In this paper, MIC circuit with the function which can remove the ripple voltage of PV module and give the discharging path for charged energy in leakage inductance of isolation transformer. The validity of proposed circuir is verified by the simulation with PSIM.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.392-394
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• 2002

Yoke simulator has been made for understanding beam movements in the deflection fields of the CRT. Consisting of the modeler, solver and post-processor, the simulator makes yoke model (conventional and rectangular yoke) and calculates charge sources and magnetic filed by BEM (boundary element method). This system supports a number of charge elements (line and surface charges) and beam movements can be predicted by the system.

• Proceedings of the KIEE Conference
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• 2005.04a
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• pp.12-14
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• 2005

This study investigates the characteristic analysis of Line-start Permanent Magnet Synchronous Motor considering skew effect. The effects of the skew on machine characteristic are analyzed by using direct co-simulation of Matlab Simulink and Flux2D. Validity of analysis method is confirmed by the analysis result of Non-skew Model.

• Proceedings of the Korea Society for Simulation Conference
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• 2000.04a
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• pp.78-83
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• 2000

MPLS는 현재 인터넷에서 전송지연, QoS, CoS와 같은 문제점을 2계층 스위칭 기법을 통하여 해결하기 위한 차세대 인터넷 프로토콜이다. 한편, 2계층과 3계층의 특성을 동시에 수용하는 MPLS는 CBT 멀티캐스트 프로토콜을 적용할 때 트래픽이 집중하게 된다. 이는 MPLS가 갖는 트래픽 엔지니어링의 장점을 제공하지 못한다. 따라서 본 논문에서는 트래픽의 집중을 분산시키는 알고리즘을 제안하고 시뮬레이션을 통하여 분석한다.

• Proceedings of the Korea Society for Simulation Conference
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• 1999.04a
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• pp.232-236
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• 1999

Codesign 방법론은 하드웨어와 소프트웨어가 공존하는 시스템을 설계할 때 이드의 설계를 각각의 특성에 맞는 방법을 사용함으로써 효율적인 디자인방법을 제공한다. 전체 시스템의 동작 및 성능을 검증하기 위해서는 다른 방법으로 개발된 하드웨어와 소프트웨어를 같이 시뮬레이션해야 하는데 이를 통합시뮬레이션(Co-simulation)이라고 한다. 하드웨어와 소프트웨어를 개발하는 방법이 다르기 때문에 야기되는 통합의 문제점을 해결하기 위하여 DEVS(Discrete Event System Specification)에 기반한 중간단계형태를 통한 변환방법론을 제시하고 이를 사용하여 C++ 모델과 Verilog HDL 모델간의 통합시뮬레이션을 구현함으로써 효용을 보이고자 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.891-893
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• 2012

Currently, aircraft and automobile simulator for training provides a variety of training by making hypothetical situation on a simulator Installed on the ground Currently. And the instructor maximizes the effectiveness of the training by Monitoring training and instructing the required training. When trainees are boarding the aircraft or automobile. The Instructor in the ground is not able to monitoring aircraft, automobile. The assessment of the training is not easy after the end of the training Therefore, it is difficult to provide high quality of education to the students. In this paper, Simulation software is to develop the following. Collecting GPS and real-time information for aircraft, automobile ${\grave{a}}implementing$ 3D simulation. Implementing Current image of the aircraft or automobile in the screen by 3D Real-time monitoring of training situation at the control center utilizing for training saving 3D video files Analysis, evaluation on training After the end of the training.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.63 no.4
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• pp.290-294
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• 2014

PID(Proportional, Integral, Derivative) controller is the most popular process controllers in nuclear power plants. The optimized parameter setting of the process controller contributes to the stable operation and the efficiency of the operating nuclear power plants. PID parameter setting is tuned when new process control systems are installed or current process control systems are changed. When the nuclear plant is shut down, a lot of PID tuning methods such as the Trial and Error method, Ultimate Oscillation method operation, Ziegler-Nichols method, frequency method are used to tune the PID values. But inadequate PID parameter setting can be the cause of the unstable process of the operating nuclear power plant. Therefore the results of PID parameter setting should be simulated, optimized and finally verified. This paper introduces the simulation method of PID tuning to optimize the PID parameter setting and confirms them of the actual PID controller in the operating nuclear power plants. The simulation method provides the accurate process modeling and optimized PID parameter setting of the multi-loop control process in particular.