• 한국시뮬레이션학회논문지
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• 제5권2호
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• pp.13-24
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• 1996

Workflow is an ordered sequence of interdependent component data activities each of which can be executed on an integrated information system by accessing a remote information system. In our previous research [4], we proposed a distributed CIM Workflow system which consists of a workflow execution model called DAF-Net and an agent-based information systems called AIMIS. Given a component data activity, there needs an interaction protocol among agents which allocates the component data activity to a relevant information systems exist. The objective of this research is to propose and test two protocols: ARR(Asynchronous Request and Response)protocol and NCL(Negotiation with Case based Learning) protocol. To test the effectiveness of the protocols, we applied the PVM(Parallel Virtual Machine) software to simulate the distributed CIM Workflow system. PVM provides a distributed computing environment in which users can run different software processes in different computers while allowing communication among the processes.

• 한국건설관리학회논문집
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• 제15권1호
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• pp.70-77
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• 2014

건설프로젝트의 성공적인 수행을 위해 의사소통, 협력, 정보공유 등을 포함한 구성원들 간의 협업은 반드시 필요하다. 그러나 프로젝트 조직 내의 협업과정이 성과에 미치는 영향에 대한 분석적인 시도는 부족하였다. 본 연구는 게임이론 기반의 에이전트기반 시뮬레이션을 활용하여 프로젝트 조직 내 협업과정을 보다 명시적으로 이해하는 방법을 제시하였다. 시뮬레이션의 결과로 구성원수준에서의 관계형성과 조직수준에서의 네트워크 발전양상을 관찰할 수 있었다. 본 연구는 프로젝트조직 내의 협업과정 분석방법 개발을 위한 기초연구이며, 향후 연구를 통해 조직 내 업무수행 프로세스, 생산작업 프로세스, 관리 프로세스 등의 부분과 결합하여 프로젝트 성과를 예측하는 방법으로 발전될 수 있을 것이다.

• 한국시뮬레이션학회논문지
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• 제10권1호
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• pp.83-92
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• 2001

For the prevention of the network intrusion from damaging the system, both IDS (Intrusion Detection System) and Firewall are frequently applied. The collaboration of IDS and Firewall efficiently protects the network because of making up for the weak points in the each demerit. A model has been constructed based on the DEVS (Discrete Event system Specification) formalism for the simulation of the system that consists of IDS and Firewall. With this model we can simulation whether the intrusion detection, which is a core function of IDS, is effectively done under various different conditions. As intrusions become more sophisticated, it is beyond the scope of any one IDS to deal with them. Thus we placed multiple IDS agents in the network where the information helpful for detecting the intrusions is shared among these agents to cope effectively with attackers. If an agent detects intrusions, it transfers attacker's information to a Firewall. Using this mechanism attacker's packets detected by IDS can be prevented from damaging the network.

• 한국시뮬레이션학회논문지
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• 제9권1호
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• pp.55-66
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• 2000

This paper deals with complex system theory to describe land combat situation using EINSTein (Enhanced ISAAC Neural Simulation Tool) simulation model. Many studies have shown that existing Lanchester equations used in most wargame models does not describe changes of combat units, real land warfare situation and qualitative factors in combat. Future warfare will be a non-linear combat with various weapon system and complex combat units. EINSTein models is an agent-based simulation tool using complex system theory. We have compared and tested land combat results with Lanchester models and EINSTein models. The results have shown that EINSTein model has a possibility to apply and analyze land warfare more properly than Lanchester models.

• 제어로봇시스템학회논문지
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• 제22권9호
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• pp.693-698
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• 2016

A decentralized control method is proposed to enable a group of robots to achieve maximum performance in multisensory target tracking while avoiding collision with the target. The decentralized control was designed based on navigation function formalism. The study showed that the multiple agent system converged to the positions providing the maximum performance by the decentralized controller, based on Lyapunov and Hessian theory. An exemplary simulation was given for a multiple agent system tracking a stationary target.

• 한국항행학회논문지
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• 제16권1호
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• pp.145-150
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• 2012

본 논문은 규칙-기반 DEVS 모델링과 시뮬레이션 기법을 사용하면서 클라우드 컴퓨팅 공동 환경의 네스티드 세션 관리에서의 오류 감지 시스템의 성능 분석을 설명한다. 본 논문은 FDA(Fault Detection Agent)의 설계와 구축을 설명한다. FDA는 클라우드 컴퓨팅 공동 환경의 네스티드 세션 관리에서 멀티미디어 원격 제어를 위한 소프트웨어 오류를 감지하기에 적합한 에이전트이다.

• 통합자연과학논문집
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• 제1권2호
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• pp.67-75
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• 2008

행위자 기초 모형을 이용하여 행위자의 시장에 대한 불균일한 영향력에 대한 연구를 수행하였다. 이때 가중치를 금융시장에서 행위자 간의 공유하는 정보의 영향력의 크기로 사용하였으며 가중치의 크기와 분포가 수익의 변동에 기여하는 것을 관찰하였다. 행위자들의 가중치의 크기가 평균적으로 클수록 가격의 변동의 크기도 같이 증가함을 알 수 있었으며 가중치의 크기뿐만 아니라 가중치의 분포에 따라서도 수익의 분포가 변하게 된다. 이는 신흥시장과 성숙한 시장에서 관찰되는 분포의 차이와 관련하여 유사성을 찾아볼 수 있을 것이라는 가능성을 제공한다. 행위자의 정보의 영향력은 항상 일정하지 않고 그 영향력이 행위자의 시장 예측에 대한 적중률에 따라 변하게 된다. 이렇게 변화하는 행위자들의 정보의 영향력의 분포는 결국 소수의 큰 영향력을 갖는 행위자와 다수의 영향을 거의 끼치지 못하는 행위자들로 분포되게 된다. 그 분포는 초기의 행위자들의 영향력 분포가 어떻게 되었든 간에 충분히 시간이 흐르면 모두 멱법칙을 따르는 분포를 갖게 된다.

• 제어로봇시스템학회논문지
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• 제18권3호
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• pp.218-223
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• 2012

Maintenance and improvement of the graph connectivity is very important for decentralized multi-agent systems. Although the CBBA (Consensus-Based Bundle Algorithm) guarantees suboptimal performance and bounded convergence time, it is only valid for connected graphs. In this study, we apply a decentralized estimation procedure that allows each agent to track the algebraic connectivity of a time-varying graph. Based on this estimation, we design a decentralized gradient controller to maintain the graph connectivity while agents are traveling to perform assigned tasks. Simulation result for fully-actuated first-order agents that move in a 2-D plane are presented.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.266-268
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• 2003

This is based on the AGENT-LUC model framework. Luangprabang Province has the largest percentage of shifting cultivation area in Laos PDR. The model simulates the spatial and temporal patterns of the shifting cultivation in the study area, using a GIS database while the total area of shifting cultivation is controlled by supply and demand balance of food. The model simulation period is from 1990 to 1999, at a spatial resolution of 500m. The results are evaluated using statistical data and remote sensing images. Through the validation, it is concluded that the trends simulated agrees to that of statistical data and the spatial and temporal patterns are also replicated satisfactorily.

• Nuclear Engineering and Technology
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• 제54권7호
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• pp.2519-2528
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• 2022

The child pick-up behavior of parents during an emergency can cause heavy traffic congestion and failing to evacuate an affected area successfully. In this study, we analyzed the effect of child pick-up behavior using, as an example, a nuclear power plant accident caused by an earthquake, which is a typical no-notice emergency. A quake was assumed to occur near the Shin-Kori nuclear power plant in Ulsan, Korea, resulting in a nuclear power plant accident. An agent-based dynamic simulation model using VISSIM was employed to conduct sensitivity analyses with different child pick-up rates. The results confirmed that parents are a major cause of congestion and a vulnerable class in an emergency evacuation. The child pick-up behavior caused significant traffic congestion, and parents who pick up their children showed a higher evacuation failure rate.