• The Magazine of the IEIE
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• v.25 no.2
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• pp.48-57
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• 1998

본 기고는 시뮬레이션 기술 분류 중 Virtual Simulation, 그 중에서도 항공기 시뮬레이터 기술에 초점을 맞추고자 한다. 항공기 시뮬레이터 기술이 시뮬레이션 전체 분야에서 차지하는 비중과 현재의 위를 객관적으로 이해하기 위하여 시뮬레이션 기술이란 무엇인가 하는 원론에서부터 출발한다. Virtual, Constuctive, Live 등의 시뮬레이션 기술들을 간략히 소개하면 이들 기술의 변천을 SIMNET(SIMulator NETworking), DIS(Distributed Interative Simulation), ALSP(Aggregate Level Simulation Protocol), HLA(High Level Architecture) 등의 프로그램 등을 통하여 살펴본다. 항공기 시뮬레이터 기술은 Virtual 시뮬레이션 기술의 발원으로서 1930년대 이후로 시뮬레이션 기술 전반을 선도하여 왔는데, 그 진화과정을 간추려 언급한다. 또한, 항공기 시뮬레이터를 구현하기 위한 기술들을 간략히 살펴보고, 그 기술들을 선도하는 네덜란드 Delft 대학의 SIMONA(SImulation, MOtion and NAvigation) 프로그램과 미국 국방성, 산업체, 학계, 연구소 등을 중심 축으로 하는 NCS(National Center for Simulation)를 소개함으로써 항공기 시뮬레이터는 물론, 시뮬레이션 기술 전반의 미래를 가늠한다. 마지막으로 항공기 시뮬레이터를 중심으로 하는 국내 시뮬레이터 기술 수준과 산업 현황을 간추려 소개한다.

• International conference on construction engineering and project management
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• 2015.10a
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• pp.339-343
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• 2015

To rapidly recover ceased functionality of a facility after a catastrophic seismic event, critical decisions on facility repair works are made within a limited period of time. However, prolonged damage assessment of facilities, due to massive damage in the surrounding region and the complicated damage judgment procedures, may impede restoration planning. To assist reliable structural damage estimation without a deep knowledge and rapid interactive analysis among facility damage and restoration operations during the approximate restoration project planning phase, we developed a prototype of distributed facility restoration simulations through the use of high-level architecture (HLA) (IEEE 1516). The simulation prototype, in which three different simulations (including a seismic data retrieval technique, a structural response simulator, and a restoration simulation module) interact with each other, enables immediate damage estimation by promptly detecting earthquake intensity and the restoration operation analysis according to estimated damage. By conducting case simulations and experiments, research outcomes provide key insights into post-disaster restoration planning, including the extent to which facility damage varies according to disaster severity, facility location, and structures. Additional insights arise regarding the extent to which different facility damage patterns impact a project's performance, especially when facility damage is hard to estimate by observation. In particular, an understanding of required type and amount of repair activities (e.g., demolition works, structural reinforcement, frame installation, or finishing works) is expected to support project managers in approximate work scheduling or resource procurement plans.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.1324-1326
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• 2002

This paper concerns the development of distributed interactive simulation of a road traffic system. The simulation involved models of multiple and distributed road vehicles running on different locations. The simulation system represented a traffic system as if the distributed simulation models were in the same environment. The development of the distributed road traffic simulation was based on High Level Architecture (HLA), a state-of-the-art IEEE standard for the distributed and real-time simulation. Other work concerned modeling and simulating the road vehicles and building the map database for the virtual distributed shared environment. The information used in the simulation system was only in X-axis and Y-axis as the insignificant data in the Z-axis was omitted to simplify the simulation. However, the traffic system has visualized a 3-D coordinate system. The road vehicle models were able to avoid collision. The next direction of a vehicle can be chosen from the provided choices of further paths.

• Journal of the Korea Society for Simulation
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• v.14 no.2
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• pp.15-24
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• 2005

The goal of a distributed simulation such as battle field simulation is to combine all kinds of simulations in the same synthetic environment and to make people interact at the same time. It is a key issue to share the same synthetic environment among simulations. To support reusability and affordability in the modeling and simulation area, DMSO(Defense Modeling and Simulation Office) of USA developed concepts such as HLA(High Level Architecture) and SEDRIS (Synthetic Environmental Data Representation and Interchange Specification). In the industrial simulation area, the digital manufacturing is the main stream. To reduce cost and to reuse simulation environment, the standardization becomes the focus of digital manufacturing. This study proposes to use SEDRIS to improve interoperability of manufacturing data. The simulation data of DELMIA, which is a leading commercial digital manufacturing solution, is mapped and translated into the SEDRIS transmittal format. Mapping of the manufacturing simulation data and the synthetic environment are implemented and verified through experiments.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.370-372
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• 2003

본 논문은 GRID 상에서 HLA(High Level Architecture)를 기반으로 한 분산 객체 지향 simulation을 위한 네트워크 하부구조인 Run-Time Infrastructure (이하 RTI)의 디자인과 구현에 관해 기술한다. RTI는 지리적으로 떨어진 응용 프로그램간의 정보 교환 외에도, 접속 사양에 정의된 다양한 서비스를 제공하는 middleware이다. GRID는 전세계에 펼쳐져 있는 자원들에 대한 관리와 접근, 사용을 위한 다양한 기능과 안전하고 편리한 security를 보장한다. 본 논문에서는 globus toolkit에서 지원하는 security와 자원 접근 방법을 사용해서 RTI에 보안과 자원의 동적 할당을 부여해서 RTI를 이용한 simulation에 뛰어난 상호 연동 능력과 대규모의 프로젝트를 위한 광범위한 자원을 보다 안전하고 효율적으로 사용할 수 있도록 하는 환경을 구현하였다.

• International conference on construction engineering and project management
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• 2009.05a
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• pp.71-82
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• 2009

This paper describes the use of a highly interactive and inter-operative application for complex simulation environments, or Synthetic Environments (SE), as deployed for construction as Construction Synthetic Environments (CSE). Based on the High Level Architecture (HLA), this research focuses on implementing simulation technology in a software environment, COSYE, that will be the foundation for building CSE applications. This framework is discussed in the context of tunneling and industrial construction applications, including steel fabrication and pipe-spool manufacture. The framework is demonstrated using the NEST sanitary tunnel project in Edmonton, Canada, in which COSYE was used for scenario-based analysis and planning.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.1555-1558
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• 2011

국방 모델링 및 시뮬레이션(Modeling & Simulation) 소프트웨어 분야에서 분산 시뮬레이션 기술표준인 HLA(High Level Architecture)의 적용이 늘어나고 있으며, 시뮬레이션 요소의 재사용성 및 신뢰성 확보를 위한 개발 프레임워크 제공이 핵심기술로 떠오르고 있다. 특히, 시뮬레이션을 위한 공통 서비스를 제공하는 M&S 프레임워크가 개발되었다. 또한, 가상의 시험 환경을 제공하기 위한 요소 중 시험환경의 구성을 위한 시나리오 모델이 있다. 본 논문에서는 시험 환경을 구성하기 위한 M&S 프레임워크 내의 시나리오의 스키마 설계에 대해서 기술한다.

• Journal of KIISE
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• v.42 no.2
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• pp.213-219
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• 2015

Simulation is used these days to verify the hypothesis or the new technology. In particular, National Defense Modeling & Simulation (M&S) is used to predict wartime situation and conduct the military training. National Defense M&S can be divided into three parts, live simulation, virtual simulation, and constructive simulation. Live simulation is based on the real environment, which allows more realistic sumulation; however, it has decreased budget efficiency, but reduced depictions of reality. In contrast, virtual and constructive simulations which are based on the virtual environment, have increased budget efficiency, but reduced depictions of reality. Thus, if the three parts of the M&S are combined to make the L-V-C combined environment, the disadvantages of each simulation can be complemented to increases the quality of the simulation. In this paper, a method of interworking heterogeneous simulation middeware for L-V-C combined environment is proposed, and the test results of interworking between Data Distribution Service (DDS) and High Level Architecture (HLA) are shown.

• The KIPS Transactions:PartA
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• v.10A no.2
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• pp.111-122
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• 2003

Military wargame simulation models must support the HLA in order to facilitate interoperability with other simulations, and using parallel simulation engines offer efficiency in reducing system overhead generated by propelling interoperability. However, legacy military simulation model engines process events using sequential event-driven method. This is due to problems generated by parallel processing such as synchronous reference to global data domains. Additionally. using legacy simulation platforms result in insufficient utilization of multiple CPUs even if a multiple CPU system is under use. Therefore, in this paper, we propose conversing the simulation engine to an object model-based parallel simulation engine to ensure military wargame model's improved system processing capability, synchronous reference to global data domains, external simulation time processing, and the sequence of parallel-processed events during a crash recovery. The converted parallel simulation engine is designed and implemented to enable parallel execution on a multiple CPU system (SMP).

• Journal of the Korea Institute of Military Science and Technology
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• v.17 no.1
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• pp.71-81
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• 2014

It is an important issue to evaluate the effectiveness of chemical warfare through modeling and simulation(M&S) technology. In this paper, we propose the M&S methodology and environment for the chemical warfare for effectiveness analysis. In detail, for modeling perspective, we propose three fundamental component models according to their behaviors, which are a chemical weapon, a detecting device system, and an engaging unit system. Among proposed models, the chemical weapon and the detecting device system models are represented by engineering-level system models, whereas the engaging unit system model are described as an engagement-level system model. For simulation perspective, we apply a hybrid simulation environment using High Level Architecture (HLA) to interoperate with the proposed engineering and engagement-level models. The proposed M&S methodology and environment enables to evaluate the effectiveness of the chemical warfare system considering the doctrines, the performance of device or weapon, and weather factors. To verify the efficiency of the proposed methodology and environment, we experimented three categorized case studies, which are related with those considering factors.