• 한국시뮬레이션학회논문지
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• 제22권3호
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• pp.15-23
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• 2013

공학설계분야에서 시뮬레이션 모델을 이용한 실험은 매우 중요한 역할을 한다. 그러나 최적의 설계 파라미터를 구하기 위한 시뮬레이션 실험은 많은 실행시간과 자원의 소요를 필요로 한다. 이를 극복하는 방안으로 입력 변수와 성능척도 간의 관계를 표현한 메타모형이 효과적으로 이용된다. 메타모형을 수립하기 위해서는 샘플 시나리오들을 입력으로 하는 시뮬레이션 실행이 요구된다. 이때 샘플 시나리의 수와 질이 메타 모형을 수립하는데 걸리는 시간과 메타모형의 정확성을 결정한다. 공간채움 특성은 샘플 시나리오들의 질을 결정하는 중요한 조건이 된다. 이 논문은 maxmin, Audze-Eglais, centered L2-discrepancy의 3가지 공간채움 척도에 기초한 샘플 시나리오 생성 방법을 제안하고, 실험을 통해 이들 생성방법에 대한 성능을 분석한 결과를 논의한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.322-325
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• 2005

TTX(Tilting Train eXpress) is being designed for improving the speed of conventional railway. The purpose of this study is to evaluate energy absorbing capacity and driver's survivability for a design candidate of the front end structure of TTX. A FE model with honeycomb block, under frame, and body frame is generated for crash simulation. Based on a level-crossing accident scenario, numerical simulation is performed using LS-DYNA. The results of crash analysis show that strength improvement of the current front end structure design candidate is needed to ensure driver safety.

• 한국수자원학회논문집
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• 제47권2호
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• pp.135-143
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• 2014

본 연구에서는 기후변화에 따른 충주댐 유입량을 모의하였으며 이때 발생되는 불확실성을 분석하였다. GCM별 불확실성을 고려하기 위해 IPCC AR4 A2 시나리오에 의한 4개의 GCM 강수량 결과를 추계학적 모형인 TFN 모형에 적용하였다. TFN 모형의 불확실성을 고려하기 위하여 정규분포를 따르는 100개의 잡음항을 생성하여 앙상블 유입량 시나리오를 생성하였고, 결과적으로 400개의 미래유입량 시나리오를 제시하였다. 분석결과 과거 30년과 비교하여 미래에는 다른 변화율을 보였으며, 모든 시나리오에서 전 기간에 걸쳐 연 유입량 증가 양상을 보였고 여름철의 유입량 증가, 봄철의 유입량 감소가 전망되었다.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.546-552
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• 2013

The future competitiveness of construction industry is dependent on K-12 students. However, unfavorable images of construction industry have negative influence on K-12 students' decision-making of their career. This negative image makes them not want to find out what actually happens in construction industry. Consequently, it is important to give K-12 students the opportunity to know what construction employees actually do in their job. Studies show that K-12 students who encounter the job early-on are more likely to choose it as their career. In this context, this paper proposes construction educational game in which it can serve as a medium for capturing K-12 students' interest in Construction Management (CM). Based on the literature reviews, challenges of construction educational game for K-12 students which are edutainment, hands-on experience and social interaction, are derived. To address these issues, conceptual model and scenario are designed. Based on designed scenario, prototype of Simulation based Construction Game in Virtual World (SCGVW) is developed in Second Life (SL) and applicability test to K-12 students are implemented. This paper concludes with a discussion of the lessons learned and the future development steps of the construction educational game for K-12 students.

• 한국산학기술학회논문지
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• 제17권10호
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• pp.39-45
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• 2016

본 연구는 친환경 농업부문 직불금의 지원이 농업부문 거시경제 지표에 어떠한 영향을 미쳤는지를 검토하기 위해 시행되었다. 이를 위해 농업부문을 일반농업과 친환경농업 부분으로 구분한 AGE(applied general equilibrium)모형을 이용하였다. 분석은 먼저 직불금 지원의 경제적 영향을 측정하기 위해 직불금 지급 이전의 상황을 기준으로 직불금이 지급된 몇 가지 상황을 시나리오로 설정하여 분석하였다. 즉 기준전망(baseline)은 직불금 지급 이전 상황, 시나리오 1은 직불금이 실제 수준으로 지급된 상황, 시나리오 2는 실제 직불금 보다 5% 추가 지원한 상황, 시나리오 3는 실제 직불금 보다 10% 추가 지원한 상황, 시나리오 4는 실제 수준 보다 15% 추가 지원한 상황, 시나리오 5는 실제 수준 보다 20% 추가 지원한 상황으로 설정하였다. 기준전망 및 시나리오에 대한 시뮬레이션 분석결과, 친환경 농업부문에 직불금의 투입으로 친환경 농업부문에 대한 고정자본 형성, 생산량, 노동생산성이 증대되었고, 이에 따른 노동력 대체효과로 친환경 농업부문 취업자는 다소 감소한 것으로 나타났다. 또한 친환경 농산물 가격은 직불금 투입 전후 큰 차이를 보이지 않은 것으로 분석되었는데 이는 공급 및 수요에 대한 가격탄력성이 비탄력적이고, 분석기간 동안 소비자들의 소득에 큰 변화가 없었기 때문에 나타난 현상으로 파악된다. 그러나 보다 더 정교한 분석을 위해 친환경 직불금의 투입에 따른 고정자본의 형성과 노동력의 대체 수준, 친환경 농업 및 농산물 관련 통계 자료의 보완에 따른 모형의 개선 등에 대해 향후 추가적인 연구가 이루어질 필요가 있다.

• 대한의용생체공학회:의공학회지
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• 제41권4호
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• pp.154-164
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• 2020

Various simulator systems for surgery training have been developed and recently become more widely utilized with technology advancement and change in medical education adopting actively simulation-based training. The authors have developed tissue-instrument interaction modeling and graphical simulation algorithms for an arthroscopic surgery training simulator system. In this paper, we propose algorithms for basic surgical techniques, such as cutting, shaving, drilling, grasping, suturing and knot tying for rotator cuff surgery. The proposed method constructs a virtual 3-dimensional model from actual patient data and implements a real-time deformation of the surgical object model through interaction between ten types of arthroscopic surgical tools and a surgical object model. The implementation is based on the Simulation Open Framework Architecture (SOFA, Inria Foundation, France) and custom algorithms were implemented as pulg-in codes. Qualitative review of the developed results by physicians showed both feasibility and limitations of the system for actual use in surgery training.

• 농촌계획
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• 제14권2호
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• pp.55-64
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• 2008

This study aims to analyze the sensitivity of WSM(weighted scenario method)-AHP method according to variation of nonlinear exponent for accessibility criteria, which are used to make urbanization potential maps with the optimal weighting value for multiple criteria in grid-based GIS technique. Besides this study tried to develop WSM-AHP2 which is simplified by using rank of the potential value for each scenario. The two methods were applied to the test area, Suwon city located south area of Seoul, with time series land-use maps of 1986 and 1996. The evaluation system of urbanization potential have 7 criteria including 6 accessibility criteria. The results of WSM-AHP2, the optimal weighting values and their corresponding potential maps, have almost similar with those of WSM-AHP. In the application of CA(cellular automata) model for expansion of urbanized area using the three potential maps by WSM-AHP, WSM-AHP2, and specialists's AHP evaluation, it also showed that the accuracy of simulation for actual urban area is the highest in the potential map of WSM-AHP, followed by WSM-AHP2 and specialists's AHP evaluation. From the results of this study, WSM-AHP and simplified WSM-AHP2 will be used to generate the optimal potential maps for land-use planning in urban fringe area.

• 대한조선학회논문집
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• 제61권4호
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• pp.226-235
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• 2024

A method for quantifying the adaptability of ship maneuver scenarios for data-driven modeling of ship dynamics is developed based on the principal component analysis. A random maneuver scenario is suggested as a reference for ship dynamics, which can obtain the converged principal components of ship dynamics features by the Monte Carlo simulation. Principal components of conventional maneuver scenarios defined by the International Maritime Organization (IMO) are compared to that of the random maneuver. A conventional ship dynamics model for a container carrier vessel for four degrees of freedom dynamics is introduced to simulate the random and IMO maneuver scenarios. It is confirmed that the IMO tests follow the tendency of random maneuver scenario in terms of execution time and adaptability.

• 한국신뢰성학회지:신뢰성응용연구
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• 제15권2호
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• pp.131-138
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• 2015

In modern warfare, the number of unmanned systems grow faster than any other weapon systems. Therefore, it is very important to predict and measure the combat effectiveness (CE) of unmanned weapon systems in battlefield for deciding defense budget to acquire those systems. In general, quantitative calculation of weapon effectiveness under complicated battlefield is difficult based on the future network centric warfare. Hence, many papers studied how to measure the combat effectiveness and tried to study a lot of related issues about it. However, there are few papers dealing with the relationship between the UGV (Unmanned Ground Vehicle)'s performance and CE in a ground battlefield. In this paper, we do the sensitivity analysis based on a given scenario in a small unit battle. In order to do that, we developed simulation model using AnyLogic and changed the input parameters such as detection and hitting probabilities. We also assess the simulation outputs according to the variation of input parameters. The MOE used in this simulation model output is survival ratio for Blue force. We hope that this paper will be useful to find which input variable is more effective to increase combat effectiveness in a small unit ground battlefield.

• 한국토양비료학회지
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• 제46권6호
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• pp.434-444
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• 2013

In order to evaluate drought risk at upland according to climate change scenario (RCP8.5), we have carried out the simulation using agricultural water balance estimation model, called AFKAE0.5, at 66 weather station sites in 2020, 2046, 2050, 2084, and 2090. Total Drought Risk Index between the first month (f) and last month (l) (TDRI(f/l)) and maximum continuous drought risk index (MCDRI(f/l)) were defined as the index for analyzing pattern and strength of drought simulated by the model. Based on distribution maps of MCDRI (1/12), drought strength was predicted to be most severe in 2084 for all regions. Some regions showed severe risk of drought meaning over 20 days of MCDRI (1/12) in the other years, while MCDRI (1/12) in other regions did not reach 5 days. Even though maximum value of TDRI (1/12) in 2090 was greater than in 2050, more severe drought risk in 2050 than in 2090 was predicted based on MCDRI (4/6). It implies that drought risk should be assessed for each crop with its own growing season.