• Proceedings of the Korea Society for Simulation Conference
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• 2002.05a
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• pp.103-108
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• 2002

본 연구는 이산 사건 시스템 형식론(DEVS: Discrete Event System Specification)을 이용한 가상전장 모델링 및 시뮬레이션 방법론을 제안한다. 기존 군체계에 관련된 모델링 기술은 물리적 모델링, 비쥬얼 모델링, 또는 개념적 모델링 등 개별 기능중심의 단편적 플랫폼 모델링에 그치고 있으며, 무기체계 분석 시뮬레이션도 개별 단위체 중심으로 평가되어져서, 다양하고 종합적인 그리고 상호운영성과 재사용성 등을 고려한 통합 모델링 및 시뮬레이션 환경을 제공하지 못하는 단점을 갖는다. 따라서 본 논문에서는 개별 전투병력에서부터 첨단 무기체계에 이르는 다양한 전장 요소들을 계층 구조적으로 통합함으로써 장에서 발생될 수 있는 개별 전투병력의 미시적 행동 특성뿐 아니라 분대/중대/대대/사단급 단위의 거시적 전략/전술에 대한 묘사까지도 가능한 가상전장 모델링 및 시뮬레이션 환경을 제안한다. 제안된 방법론은 분대 단위의 가상 전장 환경에 대한 사례연구를 통해 검증하였으며, 향후 연구로는 대단위 가상전장에 대한 묘사를 위한 HLA 분산 시뮬레이션 기술의 적용에 대한 연구가 필요할 것이다.

• Proceedings of the Korea Society for Simulation Conference
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• 2000.11a
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• pp.22-27
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• 2000

이산사건 시뮬레이션 기법이 최근 들어 통신망, 각종 제조시스템 등 다양한 분야에 응용되고 있으며 군사용 시뮬레이터 개발을 위한 방법론으로도 활용이 증가하고 있다. 그러나, 군사용 전략 시뮬레이터는 모델간 대규모 상호 작용을 요구하는 속성을 가지고 있으므로 모델간의 사건 전달 방법을 적용한 시뮬레이터를 구현하는 경우에 시뮬레이션을 위한 계산량이 과도하게 요구되어 대규모의 시나리오를 시뮬레이션하는데 어려움이 있다. 본 논문에서는 이산사건 시뮬레이션을 위한 이론적 기반을 모두 갖춘 DEVS 형식론을 개선하여 군사용 전략 시뮬레이터를 개발하기 위한 Framework을 소개한다. 개발되는 시뮬레이션 환경을 DEVS 의미론에 기반한 모델링 환경을 제공하지만 시뮬레이션 속도 개선을 위해 여러가지 방법들을 고려한다. 또한, GIS 기반의 시뮬레이션 애니메이션을 위한 모델 관리 방법 및 데이터 전송 방법을 기술한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.12
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• pp.2581-2588
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• 2012

Survivability of combat system is changed by various facts in dynamic battle field. Existing survivability analysis programs for a combat system analyze statically survivability for combat system in spite of dynamic battle environment. To overcome this limitation, we propose an agent-based modeling and simulation method for dynamic survivability analysis of the combat system. To do this, we have adopted DEVS formalism, SES/MB framework and agent technology for modeling components of the combat system and crews. The proposed method has advantages of being able to analyze not only a static survivability of the combat system but also a dynamic survivability of combat system by applying responses of crews in battle field.

• Journal of the Korea Society of Computer and Information
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• v.27 no.5
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• pp.101-107
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• 2022

Modeling and simulation is a technique used for operational verification, performance analysis, operational optimization, and prediction of target systems. Discrete Event System Specification (DEVS) of this representative technology defines models with a strict formalism and stratifies the structures between the models. When the atomic DEVS models operate with an intention different the target system, the simulation may lead to erroneous decision-making. However, most DEVS systems have the exclusion of the model test or provision of the manual test, so developers spend a lot of time verifying the atomic models. In this paper, we propose a script-based automated test system for accurate and fast validation of atomic models in Python-based DEVS. The proposed system uses both the existing method of manual testing and the new method of the script-based testing. As Experimental results in our system, the script-based test method was executed within 24 millisecond when the script was executed 10 times consecutively. Thus, the proposed system guarantees a fast verification time of the atomic models in our script-based test and improves the reusability of the test script.

• Journal of the Korea Society for Simulation
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• v.21 no.4
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• pp.35-46
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• 2012

As complexity of real-time systems is being increased ad hoc approaches to analysis of such systems would have limitations in completeness and coverability for states space search. Formal means using a model-based approach would solve such limitations. This paper proposes a model-based formal method for logical analysis, such as safety and liveness, of real-time systems at a discrete event system level. A discrete event model for real-time systems to be analyzed is specified by DEVS(Discrete Event Systems Specification) formalism, which specifies a discrete event system in hierarchical, modular manner. Analysis of such DEVS models is performed by Communicating DEVS (C-DEVS) formalism of a timed global state transition specification and an associated analysis algorithm. The C-DEVS formalism and an associated analysis algorithm guarantees that all possible states for a given system are visited in an analysis phase. A case study of a safety analysis for a rail road crossing system illustrates the effectiveness of the proposed method of the model-based approach.

• Proceedings of the Korea Society for Simulation Conference
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• 2001.05a
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• pp.77-81
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• 2001

In this paper, a RAID system is modeled and simulated by using the DEVS formalism. The RA[D system interacts with a host system by using the high-speed Fibre channel protocol and stores input data in an array of IDE disks. The DEVS formalism specifies discrete event systems in a hierarchical, modular manner. The RAID system model is composed of three units: primary-PCI unit, secondary-PCI unit and CPU unit. The primary-PCI unit interfaces with the host system and caches I/O data. The secondary-PCI unit includes disks. The CPU unit controls overall system. The control algorithm of CPU and PCI transactions are analyzed and modeled. From an analysis of simulation events, we can conclude that the proposed model satisfies given requirements.

• Journal of Advanced Navigation Technology
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• v.24 no.3
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• pp.184-191
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• 2020

Avionics System Integration Laboratory is the integrated test environment for integration and verification of avionics systems. When real equipment can not be used in the laboratory for various reasons, software models should be needed. Because there hasn't been any standardized method for the models so that it is difficult to reuse the developed models, the need for a framework to develop the avionics software models was emerged. We adopted DEVS(discrete event system specification) formalism as the standardized modeling method for the avionics software models. Due to DEVS formalism is based on event-driven algorithm, it doesn't accord a legacy system which has sequential and periodic algorithms. In this paper, we propose real-time event-driven modeling and simulation method for SIL to overcome these restrictions and to maximize reusability of avionics models through the analysis of the characteristics and the limitations of avionics models.

• Journal of the Korea Society for Simulation
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• v.15 no.3
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• pp.1-9
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• 2006

As an effective solution to resolve complex computing problems and to handle geographically dispersed data sets, grid computing has been noticed. Grid computing separates an application to several parts and executes on heterogeneous computing platforms simultaneously. The most important problem in grid computing environments is to manage grid resources and to schedule grid resources. This paper proposes a grid transaction network model that is applicable for resource management and scheduling in grid computing environment and presents a grid resource bidding algorithm for grid users and grid resource providers. Using DEVSJAVA modeling and simulation, this paper evaluates usefulness and efficiency of the proposed model.

• Journal of the Korea Society for Simulation
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• v.20 no.3
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• pp.89-100
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• 2011

The MAGLEV (Magnetically Levitated Vehicle) system, which is under commercialization as a new transportation system in Korea, is operated by means of unmanned automatic control system. Therefore the plan of train operation should be carefully established and validated in advance. In general, when making the train operation plan, the statistically predicted traffic data is used. However, traffic wave can occur when real train service is operated, and the demand-driven simulation technology is required to review train operation plans and service qualities considering traffic wave. This paper presents a method and model to simulate the MAGLEV's operation considering continuous demand changes. For this purpose, we employed the discrete event model which is suitable for modeling the behavior of railway passenger transportation, and modeled the system hierarchically using DEVS (Discrete Event System Specification) formalism. In addition, through the implementation and experiment using DEVSim++ simulation environment, we tested the feasibility of the proposed model and it is also verified that our demand-driven simulation technology could be used for the prior review of the train operation plans and strategies.

• Journal of the Korea Society for Simulation
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• v.16 no.2
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• pp.1-8
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• 2007

Resource management in grid computing environment is essential for integration and interaction among heterogeneous resources. This paper discusses resource management methods of centralized and decentralized broker-based modeling for solving complex problems of resource management and presents design and development of the decentralized broker-based resource management modeling in grid computing environment. This model comprises a global resource broker and a local resource broker, and we derive reduction of communication and functional dispersion of Job management using a local resource broker. The simulation experiment shows the improvement of resource utilization and average response time and proves that this model improves utilization of resources and replies to user requests promptly.