• Journal of the Korean Society of Marine Environment & Safety
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• v.20 no.1
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• pp.86-95
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• 2014

Productivity improvement of a shipbuilding company depends on how efficiently its limited resources are managed and utilized. Recently, research on modeling and simulation (M&S) to support shipyard production management system has been being under study. The production management based on M&S rejects decision making on experience, and it can establish productivity improvement method based on quantitative and specific data. In this paper, M&S is applied to the long-term plan as a part of the production planning in shipyards. To this end, the long-term plan processes and related management systems are analyzed. Based on the analysis, a simulation model and an application system using commercial simulation software are suggested. And basic structure of the suggested system is based on web technology such as Rich Internet Application, web services protocol for compatibility with existing shipyard enterprise systems. Utilizing the results of this study, it is expected that shipyard production planners can settle down work flow, in which one can establishes the production plan, simulates the plan, and analyzes the results, enabling a more reliable production plans.

• Journal of the Korea Society for Simulation
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• v.22 no.2
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• pp.73-83
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• 2013

This paper presents design and implementation of the monitoring system for the distributed simulation of underwater warfare. As importance of defense modeling and simulation(M&S) has raised, Simulation-Based Acquisition(SBA) was authorized for an obligatory process in the development process of weapon systems. Yet, it requires tremendous resources to develop a large-scale simulation system that describes complex and broad battlefields. Therefore, an approach of the distributed system was devised to develop a new simulation system combining legacy simulators that were developed for confined purpose and sole operations. High-Level Architecture(HLA) of distributed systems is a standardized protocol by IEEE for the distributed simulation system and Run-Time Infrastructure(RTI) is an implementation of HLA to structure efficient distributed systems. The main objective of this paper is to derive appropriate monitoring factors for underwater warfare simulation, design and implementation of the monitoring system to analyze the factors based on HLA/RTI.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1999.10a
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• pp.16-21
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• 1999

본 연구에서는 컴퓨터 상에 제어기와 구동부 등으로 구성된 가상제조시스템(Virtual Manufacturing System)을 구축하고 시뮬레이션하는 방법론을 다룬다. 특히 설비들간의 이동시 발생할 수 있는 3차원 공간상의 충돌을 검출하는 이산사건 및 연속상태 혼합 시뮬레이션 방법론을 소개한다. 시뮬레이션 모델은 DEVS(discrete event system specification) 형식론(formalsim)에 기초한 형상기구학 정보를 갖는 이른바 GKDEVS(Geometrical Kinematic DEVS)을 이용하였고, 시뮬레이션 방법론은 DEVS의 추상화 시뮬레이션(abstract simulation)방법을 확장하였다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1790_1791
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• 2009

OpenCV을 사용하여 MFC/OpenGL 환경의 BTT 미사일을 설계하였다. 시뮬레이션을 수행 하는 동안의 이미지에서 표적의 특징점(Feature point)를 추출해 호모그래피 행렬(Homography Matrix)을 계산하여 이로부터 표적의 위치, 속도, 자세 정보등을 추정하도록 하였다. 그리고 미사일 동역학, 자동 조종 장치 역시 C로 구현하여 통합 시뮬레이션 환경을 구축하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.457-459
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• 2004

그리드 컴퓨팅은 다양한 이기종 분산 컴퓨팅 환경에서 다양한 소프트웨어들에 대한 설치, 운영, 업그레이드, 유지보수 등이 요구된다. 이러한 환경에서 응용 소프트웨어(특히, 레가시 소프트웨어) 지원은 매우 어려운 작업이다. 웹 포탈 기술은 이러한 문제에 대한 효과적 대안이다. 그러나 웹 포털의 경우 다양한 사용자 인터페이스 제공이 난해하여 긴밀한 사용자와 컴퓨터간 상호작용이 요구되는 응용과학 분야 연구에 적용이 어렵다. MGrid 포탈은 BT/NT분야에서 광범위하게 사용되는 연구기법인 분자 시뮬레이션을 지원하도록 설계된 그리드 포탈 시스템으로 분자 시뮬레이션 작업들에 대한 상세한 모니터링 및 통제 기능을 지원하도록 설계되어 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.196-198
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• 2003

배터리를 주 전력원으로 사용하는 MANET(Mobile Ad hoc NETwork)에서 전력 소비를 줄이는 방법에 대한 연구가 활발히 진행되고 있지만, 이의 실험을 지원하는 시뮬레이션 도구를 찾아보기는 어렵다. 본 논문에서는 IEEE 802.11의 DCF-PSM 시뮬레이션 환경을 제공하기 위해 ns-2에 PSM 모듈을 구현하였고, 특히 전력 소비와 관련된 결과 자료를 쉴게 생성하기 위해 여러 가지 편의성을 제공하는 에너지 모델을 제안하였다. 이러한 모들의 개발로 PSM 환경에서의 상위 계층 프로토콜의 성능 평가나 PSM에 적합한 새로운 상위 계층 프로토콜의 개발이 가능해졌고, PSM을 개선하는 알고리즘의 구현과 그의 성능 평가도 훨씬 쉽게 이루어질 수 있게 되었다.

• Journal of the Korea Society for Simulation
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• v.25 no.4
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• pp.43-52
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• 2016

Wireless sensor network (WSN) technology has been implemented using commercial off-the-shelf microcontrollers (MCUs), In this paper, we propose a simulation environment to realize the physical evaluation of FPGA-based node by considering vertically cross-layered WSN in terms of physical node device and network interconnection perspective. The proposed simulation framework emulates the physical FPGA-based sensor nodes to interoperate with the NS3 through the runtime infrastructure (RTI). For the emulation and interoperation of FPGA-based nodes, we extend a vendor-providing FPGA design tool from the host computer and a script to execute the interoperation procedures. The standalone NS-3 is also revised to perform interoperation through the RTI. To resolve the different time-advance mechanisms between the FPGA emulation and event-driven NS3 simulation, the pre-simulation technique is applied to the proposed environment. The proposed environment is applied to IEEE 802.15.4-based low-rate, wireless personal area network communication.

• Journal of the Korea Society for Simulation
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• v.24 no.4
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• pp.69-76
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• 2015

Modern warfare, which adopt an intensive technique of applied sciences, is difficult to predict, and has a high complexity. Thus, it is necessary to build a battle-field environment and simulation-based analysis. Various organizations are participated to build battlefield model for defense M&S according to a scale and format. On the basis of this trend, approaching from various systems is needed to reconfigure battlefield modeling for distributed system. This paper proposes building design for battlefield simulation environment with a sample of one-to-one single unit engagement model. The proposed method can expect to utilize an example of distributed environment for various participants that are involved in battlefield modeling and simulation.

• The KIPS Transactions:PartA
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• v.14A no.4
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• pp.227-234
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• 2007

In the virtual prototyping environment, we can simulate details of a target model using many components and libraries provided in advance on a computer. The real prototyping environment provides the test simulation environment as a real product, but we can't do a detailed simulation of a real product in the virtual prototyping environment, and we can't do various simulations in the real prototyping environment. So, we made a integrated prototyping environment for linkage of the two types of prototyping environments. Also, in this paper, we developed the integrated prototyping environment based on objects. By this kind of embedded system development environment, we can have the advantages as reuse, flexibility, scalability, and more convenient of product making.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.3
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• pp.87-92
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• 2013

This study is to analyze the impacts of different High-Pass lane speed limits. Paramics, microscopic simulation software, was used to perform microscopic simulations. For the simulations, Incheon toll gate traffic count data was used. The Paramics simulation results show that higher High-Pass speed limit (70Km/h) produced better traffic flow condition and less air pollution cost compared to existing High-Pass speed limit (30Km/h).