• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.189-190
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• 2018

국내 해기 교육기관에서는 초급항해사들이 운항 경험과 기술을 습득할 수 있도록 선박조종시뮬레이션 교육을 필수로 이수하도록 한다. 그러나 이러한 시뮬레이션 교육은 교육 기간 및 내용에 대해서만 국내외 지침에 명시되어 각 교육기관에서는 자체 커리큘럼에 의하여 시뮬레이션 시나리오를 구성하고 있다. 하지만 실제 어떠한 환경의 해역에서 시뮬레이션 실습을 수행하였는지는 초급항해사가 경험과 기술을 습득하는데 중요한 역할을 한다. 따라서 본 연구에서는 PARK Model을 이용하여 시뮬레이션 시나리오의 난이도를 추정하고, 난이도에 따라 초급항해사의 운항기술을 타선박과의 이격거리, DCPA, PARK Model 위험도 값, 항로탈거리의 요소로 그 변화를 분석하였다. 이는 추후에 난이도 별로 시나리오를 구성하여 균일한 교육 커리큘럼을 수립하는데 기초 자료로 사용될 수 있을 것이다.

• Proceedings of the Korea Society for Simulation Conference
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• 2001.05a
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• pp.144-147
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• 2001

본 논문은 시뮬레이터 소프트웨어의 개발, 문서화, 실시간 수행 및 시험 등을 용이하게 하는 시뮬레이션 환경을 위해 개발중인 시뮬레이션 환경을 소개하는 것을 목적으로 하고 있다. 개발중인 시뮬레이션 환경은 원자력교육원 2호기 시뮬레이터 노심모델을 기본 모델로 하고있으며, 현재 멈춤/실행 (Freeze/Run), 운전상태의 저장(Snapshot), 임의의 변수에 대한 동적인 변수값 도시(Display), 실시간 형상화 툴 등 몇 가지 기능은 이미 구현하여 실행중이며, 조속한 시일에 전체적인 통합 환경이 구축될 것으로 예상된다. 본 시스템의 구축으로 모든 시뮬레이션 모델 및 각종 펄프의 실시간 실행/빠른실행/느린실행 등의 개별 운전모드 시간조정도 가능해져 시뮬레이터 모델 이외에도 기존의 사용 프로그램의 통합 등 다양한 응용이 가능할 것으로 기대된다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.4D
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• pp.539-546
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• 2011

Traffic accident collision interpretation is composed of various shapes, and speed variations working to the vehicle during collision are utilized as a very important factor in evaluating collision degrees between vehicles and safety of passengers who got in the vehicle. So, methods of interpreting results on speed variations utilizing simulation programs on the collision interpretation become necessary. By the way, reliability evaluation on each program is being required because various collision interpretations simulations are spread widely. This study utilized collision interpretation programs such as EDSMAC and PC-CRASH adopting completely different physical approaches, and then carried out collision experiments of one-dimensional front and two-dimensional right angle while changing values of a lot of collision factors such as vehicle's weight, center of gravity, rolling resistance, stiffness coefficient, and braking forces among early input conditions. Also, the study recognized effects of collision factors to speed variations as output results during crashing. As a result of this research, two simulation programs showed same speed variations together on the vehicle's weight, center of gravity, and braking forces. Stiffness coefficient of the vehicle reacted to EDSMAC only, and rolling resistance coefficient did not affect any particular influences on speed variations. However, there appeared a bit comparative differences from the speed variation's values, and this is interpreted as responding outcomes by applying fixed properties values to each simulation program plainly. Therefore, reliability on analysis of traffic accident collisions shall be improved by doing speed analysis after taking the fixed value of simulation programs into consideration.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.12 no.5
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• pp.499-506
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• 2019

This paper is concerned with the operating stability of 7kW inverter using SIC hybrid module and verifies the validity of the simulation results by comparing the result of the loss equation and the simulation result, Simulation results using Si module and SiC hybrid module are compared to compare switch loss and diode loss. Through the loss equation calculation, the conduction loss of SiC Hybrid module is 168W, switching loss is 9.3W, diode loss is 10.5nW, When compared with the simulation results, similar values were shown. As a result of comparing the simulation results of the Si module and the SiC Hybrid module, The total device loss of the Si module was 246.2W, and the total device loss of the SiC Hybrid module was 189.9W. The loss difference was 56.3W, which was about 0.8W. thereby verifying the reverse recovery characteristics of the SiC SBD. In addition, temperature saturation test was conducted to confirm the stability of SiC Hybrid module and Si module under high temperature saturation, In the case of the Si module, the output power was stopped at 4kW, and the SiC Hybrid module was confirmed to operate at 7kW. Based on this, an efficiency graph and a temperature graph are presented, and the Si module is graphed up to 4kW and the SiC Hybrid module is graphed up to 7kW.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.1807-1813
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• 2007

The study aims at analyzing an underground station refuge model using EXODUS, one of the refuge simulation programs. The model for simulation is the Daegu Subway (Joongang-ro station). The details of the accident are referred to as the simulation condition the refuge time of traveling from the $3^{rd}$ basement platform to the $1^{st}$ basement is mainly calculated, with passengers numbering 1,000 including 329 at car 1079, 320 at car 1080, and 360 who are not on board. Reference data is used to set up the position of passengers. CFAST fire simulator is also used, and a fast curve among the $t^2$ growth curves, selected as fire growth scenario. The zone is divided into a total of 24 including 18 at the $3^{rd}$ basement platform and 6 at the $2^{nd}$ basement the $1^{st}$ basement is excluded in the fire simulation, however.

• Journal of the Korea Society for Simulation
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• v.23 no.4
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• pp.203-210
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• 2014

This study proposes adaptive decision making method having feed-back structure of regression and simulation models to support the quick decision making of production managers by managing and integrating the mutual relationship among historical data. For that, from historical data that have extracted and accumulated from each process, we first selected major constraint resources that are used as independent variables in regression model. The regression model is designed by using the dependent variables (objectives) that defined above by managers and independent variables selected in previous step and simulation model that are composed of constraint resources is designed. In process of simulation run, we obtain the multiple feasible solutions (alternatives) by using meta-heuristic method. Each solution is substituted by regression equation and we found the optimal solution that is minimum of difference between values obtained by regression model and simulation results. The optimal solution is delivered and incorporated to production site and current operation results from production site is used to generate new regression model after that time.

• Journal of the Korea Society for Simulation
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• v.18 no.4
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• pp.1-8
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• 2009

The distributed war-game simulation system has been used to represent the virtual battlefield environment. In order to produce a simulation result, simulators connected from a network transfer messages with location information of simulated objects to a central simulation server. This network traffic is an immediate cause of system performance degradation. Therefore, the paper proposes a system to manage and control network traffic generated from distributed war-game simulation. The proposed system determines the moving distance of simulated objects and filters location messages by a distance threshold which is controlled according to system conditions like network traffic and location error. And, the system predicts the next location of simulated objects to minimize location error caused by message filtering. Experimental results demonstrate that the proposed system is effective to control the network traffic of distributed war-game simulation systems and reduce the location error of simulated objects.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.1
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• pp.35-44
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• 2010

Available daylight in inside offers comfortable view environment, and psychological and physical advantages to people in a room. Architectural design has a need for daylight prediction. But it is difficult to predict the illuminance values in daylight system. Using various Daylight simulation software is easy and simple, but we can find different results under the same conditions. This study compares with illuminance values from simulation (Lightscape 3.2, Relux 2007, Radiance 3.9) and Mock-up experiment with a same space and parameter of daylight (location of space and window, date, time and sky condition).

• Journal of the Korea Society for Simulation
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• v.16 no.2
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• pp.75-81
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• 2007

Previous queue inference has been studied with some limits. Larson's inference engine, which is the basis for this paper, also processed with basic assumption that arrival process is poisson process. Our inference method, which relaxes the poisson process assumption, must be a useful tool for looking into unobservable inside of queueing systems, as well as calculating accurate system performance. This paper employs these inference methods and proves the validity. Then we apply this method to system analysis for more complicated models. At first, we suggest methods to system with known number of servers, then expand to unknown number of servers. For validating our inference approach, we run some simulation models and compare true values with our results.

• Proceedings of the KIPE Conference
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• 2006.06a
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• pp.260-262
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• 2006

본 논문에서는 블레이드 피치각 변동을 포함한 풍력발전기 출력특성 시뮬레이션 모델을 개발하였으며, 피치각 변동이 필요한 경우를 각각 비상정지, 기동원활, 출력제한의 3가지 사례 연구를 통해 개발된 모델의 검증 수행하였다. 비상정지의 상황에서 풍력발전기의 출력특성을 모의하였고, 초기 정지 상태에서 블레이드 기동을 위한 초기 피치각 설정 및 변동하는 회전 속도에 맞는 블레이드 변동 지령 값을 구현하였으며, 정격 풍속이상에서 피치각을 감소시키는 제어기를 구현하여 정격이상의 출력 발생이 제한되는 것을 시뮬레이션을 통하여 확인하였다.