• Wind and Structures
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• 제27권3호
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• pp.199-211
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• 2018

This paper deals with wind fragility and risk analysis of high rise buildings subjected to stochastic wind load. Conventionally, such problems are dealt in full Monte Carlo Simulation framework, which requires extensive computational time. Thus, to make the procedure computationally efficient, application of metamodelling technique in fragility analysis is explored in the present study. Since, accuracy by the conventional Least Squares Method (LSM) based metamodelling is often challenged, an efficient Moving Least Squares Method based adaptive metamodelling technique is proposed for wind fragility analysis. In doing so, artificial time history of wind load is generated by three wind field models: i.e., a simple one based on alongwind component of wind speed; a more detailed one considering coherence and wind directionality effect, and a third one considering nonstationary effect of mean wind. The results show that the proposed approach is more accurate than the conventional LSM based metamodelling approach when compared to full simulation approach as reference. At the same time, the proposed approach drastically reduces computational time in comparison to the full simulation approach. The results by the three wind field models are compared. The importance of non-linear structural analysis in fragility evaluation has been also demonstrated.

• 한국국방경영분석학회지
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• 제25권2호
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• pp.1-14
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• 1999

Metamodels using response surface methodology (RSM) are used for the optimality analysis of linear programming (LP). They have the form of a simple polynomial, and predict the optimal objective function value of an LP for various levels of the constraints. The metamodelling techniques for optimality analysis of LP can be applied to large-scale LP models. What is needed is some large-scale application of the techniques to verify how accurate they are. In this paper, we plan to use the large scale LP model, strategic transport optimal routing model (STORM). The developed metamodels of the large scale LP can provide some useful information.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 1999년도 춘계공동학술대회:정보화시대의 지식경영
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• pp.191-192
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• 1999

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 1996년도 추계학술대회발표논문집; 고려대학교, 서울; 26 Oct. 1996
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• pp.147-150
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• 1996

A homing torpedo's performance can be expressed a function of many variables, i.e. technical and tactical variables. When designing a homing torpedo, these variables have to be decided upon. The system effectiveness of a homing torpedo can be determined by analyzing of these variables. This paper describes a procedure of simulation metamodelling using a Factor Analysis methodology. A simulation model was used in order to obtain the data base for analyzing detection probability of torpedo. By analyzing the main and interaction effects these variables on the analysis of detection probability, we will show the importance of certain variables, of a homing torpedo.

• 정보과학회 논문지
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• 제43권3호
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• pp.314-326
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• 2016

엔터프라이즈 비즈니스 모델링의 정형 명세와 검증을 위해 프로세스 대수들이 사용된다. ${\pi}$-calculus와 Mobile ambient는 분산 실시간 비즈니스 프로세스의 이동성을 표현할 수 있다. 그러나 이동성을 표현하는 데 있어 몇 가지 제약이 존재한다: 1) ${\pi}$-calculus는 포트의 이름을 전달함으로써 간접적으로만 이동성을 표현한다, 2) mobile ambient는 ambient를 사용하여 강제적인 비동기적 이동만을 표현한다. 이러한 문제를 해결하기 위하여 본 논문은 이동성을 표현하기 위한 새로운 프로세스 대수인 ${\delta}$-calculus를 제안한다. ${\delta}$-calculus는 비즈니스 프로세스의 동기적 이동을 시공간에서 직접적으로 표현할 수 있다. 이동성으로 인해 나타날 수 있는 안전성, 보안성의 위협은 동기성, 우선순위, 데드라인 속성들을 통하여 표현이 가능하다. 제안한 개념의 시뮬레이션을 위해 ADOxx 메타-모델링 플랫폼으로 SAVE 도구를 개발하였다.