• Proceedings of the Korea Society for Simulation Conference
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• 한국시뮬레이션학회 1998년도 The Korea Society for Simulation 98 춘계학술대회 논문집
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• pp.78-85
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• 1998

The paper introduces major technical specifications of the Line II railway simulators of Pusan City in Korea. Comparing design specifics of the railway simulators with of the light aircraft Flight Training Device(FTD, the paper reveals commonality of implementation technologies applied to both simulators: Overall configurations and design philosophies are basically the same. In both programs VMEbus computing systems with UNIX are adapted as backbones of the simulators. It is found that the railway simulators are less stringent in real-time requirements than the aircraft FTD, and the railway simulators are designed to be more event-driven and object-oriented. The experiences show that models may be diverse depending on the objects but implementation technologies are about the same. Maximizing portability of implementation technologies is a matter of an organizations strategy of adopting standardized processes and modular technologies available and most economic to them.

• Journal of the Korea Society for Simulation
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• 제12권1호
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• pp.73-83
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• 2003

This paper presents armed vehicle BAttle Group Simulation model(called BAGSim) which is an object-oriented simulation system for representing battle group engagement consisting of tanks and helicopters. BAGSim is designed in the evolutionary software life cycle approach with the Unified Software Development Process, and implemented with C++ language. BAGSim consists of a preprocessor for engagement scenario definition and simulation data set up, a main processor for triggering engagement event and advancing simulation clock, and a post processor to record simulation histories. Application scenario covers several type of engagement among command tanks, fight tanks, scout helicopters, attack helicopters, anti-tank guided missiles, and decoys. Thus, BAGSim can be effectively used as an analytic tool to examine some operational concepts and tactics, further experimentally fine tune tank design options.

• The Transactions of the Korean Institute of Electrical Engineers A
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• 제55권4호
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• pp.144-150
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• 2006

IEC 61850 is the worldwide protocol for the substation automation system. IEC 61850 transports the information which consists of different formats such as GOOSE(Generic Object Oriented Substation Event), MMS(Manufacturing Message Specification), SV(Sampled Values) and so on. For real time data transmission, GOOSE can be used. The remote-bus current data which were collected in a local-bus current differential IED can be transmitted to a distance IED at the same location by using GOOSE messages. The distance IED can eliminate the reactance effect by using the transmitted remote-bus current data. This method can improve the performance of the fault location.

• Journal of Astronomy and Space Sciences
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• 제26권2호
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• pp.267-278
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• 2009

Automation of the key flight dynamics operations for the geostationary orbit satellite mission is analyzed and designed. The automation includes satellite orbit determination, orbit prediction, event prediction, and fuel accounting. An object-oriented analysis and design methodology is used for design of the automation system. Automation scenarios are investigated first and then the scenarios are allocated to use cases. Sequences of the use cases are diagramed. Then software components and graphical user interfaces are designed for automation. The automation will be applied to the Communication, Ocean, and Meteorology Satellite (COMS) flight dynamics system for daily routine operations.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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• pp.263-266
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• 2009

IEC 61850 based substation automation system is operating with Generic Object Oriented Substation Event message when an IED need to send an important signal to other IEDs or receive the signals from another IED such as trip and interlock. So interoperability of substation automation system may be assured throughout the verification of IED GOOSE. This paper shows a testing contents for GOOSE subscription and publish of IEC 61850 based IED and describes how to analysis the result of GOOSE testing. Now domestic IED completed by GOOSE test of this study are working in KEPCO test field.

• Journal of the Korea Institute of Military Science and Technology
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• 제10권3호
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• pp.90-99
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• 2007

The DEVS formalism has the well-defined relationship between its model and simulator. However, it does not define the connection between its model and experimental frame needed when a simulator's implemented with it. So, in most DEVS based simulators, the modules of the two parts are tangled, so that changing and reusing them is not easy. This paper proposes a method to improve the changeability of the experimental frame and the reusability of the model by modularizing the two parts using the AOP technology. I applied the new method to a real project, and the result shows that it improves the two qualities effectively than before.

• Journal of the military operations research society of Korea
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• 제27권2호
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• pp.134-148
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• 2001

In this paper, air-defense simulation model, called "DADSim", will be introduced. DADSim(Distributed Air Defense Simulation Model) was developed by Modeling&Simulation Lab of K.N.D.U.(Korea National Defence Univ) Weapon Systems Department. This model is an analysis-purpose model in the engagement-level. DADSim can simulate not only the global air-defense or Korean Peninsula but also the local air-defense or a battle field. DADSim uses the DTED(digital terrain elevation data) LeveII it for the representation of peninsula terrain characteristics. The weapon systems cooperated in the model are low/medium-range missile systems such as HAWK, NIKE, SAM. DADSim was designed in the way of object-oriented development method, implemented by C++ language. The simulation view is an event-sequenced object-orientation. For the convenience of input, output analysis, GUI(Graphic User Interface) of menu, window, dialog box, etc. are provided to the user, For the execution of DADSim, Silicon Graphic IRIX 6.3 or high version is required. DADSim can be used for the effectiveness analysis of­defence systems. Some illustrative examples will be shown in this paper.

• Journal of KIISE:Software and Applications
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• 제27권11호
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• pp.1088-1098
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• 2000

제어 루프는 입력 값들만으로써는 정확한 출력 값들을 계산하기 어렵거나 불가능한 물리적 공정들을 제어하는 공정 제어 시스템에 핵심적인 구성 요소이다. 본 논문에서는 실시간 공정 제어 응용 시스템의 효율적인 개발을 지원하기 위하여 공정 제어 루프 프레인웍을 포인트 클래스를 기본 단위로하여 제어 루프의 공정 변수들과 제어 알고리즘을 캡슐화 함으로써 다양한 구조와 행위를 갖는 공정 제어 응용 시스템으로 쉽게 개조, 확장이 가능하도록 설계되었다. 공정 변수들에 대한 연속적인 재계산을 수행하는 포인트 객체들의 상호 작용을 통하여 요구된 공정의 감시 제어 기능을 유연하게(flexible) 구현할 수 있는 사건/시간 구동적인(event/time-triggered) 포인트 클래스의 설계 패턴이 본 논문의 핵심이다. 본 제어 루프 프레임웍의 설계에는 Observer, Composite, Strategy, Proxy 등과 같은 객체 지향 패턴들이 사용되었다.

• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 1999년도 가을 학술발표논문집 Vol.26 No.2 (1)
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• pp.626-628
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• 1999

제어 루트는 입력값들 만으로써 정확한 출력값들을 계산하기 어렵거나 불가능한 물리적 공정들을 제어하는 공정 제어 시스템에 핵심적인 구성 요소이다. 본 논문에서는 실시간 공정 제어 응용 시스템의 효율적인 개발을 지원하기 위하여 공정 제어 루프 소프트웨어를 재사용성이 높은 객체지향 프레임웍으로 설계, 구현한 사례를 기술한다. 본 논문의 제어 로프 프레임웍은 포인트 클래스를 기본 단위로 제어 루프의 공정 변수들과 제어 알고리즘을 캡슐화하여 다양한 구조와 행위를 갖는 공정 제어 응용 시스템으로 쉽게 개조, 확장이 가능하도록 설계되었다. 본 논문의 핵심은 공정 변수들에 대한 연속적인 재계산을 수행하는 포인트 객체들의 상호 작용을 통하여 요구된 공정의 감시 제어 기능을 유연하게 구현할 수 있는 사건/시간 구동적인(event/time-triggered) 포인트 클래스의 설계 패턴이다. 본 제어 루프 프레임웍의 설계에는 Observer, Composite, Strategy, Proxy 등과 같은 객체 지향 패턴들이 사용되었다.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2007년도 춘계학술발표대회
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• pp.757-760
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• 2007

최근 각 기업과 공공기관들의 서비스들은 웹 서비스 기반으로 구축되고 있다. 이러한 여러 서비스들을 혼합한 협업적 웹 서비스 환경에서 서비스에 대한 프로세스 관리, 서비스 상태 체크, 서비스 과금을 위한 과금 요소 추출등을 위한 모니터링이 필요하다. 이에 본 논문에서는 효과적인 모니터링을 위하여 이벤트 기반의 협업적 웹 서비스 관리 모니터링 구조와 방법을 제시한다. SOA (Service Oriented Architecture) 기반의 협업적 웹 서비스 개발 생명주기를 단계별로 검토하여 관리 모니터링의 관점에서 필요한 요구사항들을 찾아내고, 이를 기반으로 협업적 웹 서비스 관리를 위한 이벤트 기반의 관리 모니터링 시스템 아키텍처를 제시한다.