• Journal of Information Technology Application
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• v.1 no.3_4
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• pp.133-152
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• 1999

생산 시스템은 일반적으로 규모가 크고 복잡하며 동시 발생적인 특성을 가지는 경우가 많다. 이러한 특징은 시스템의 행태를 사전에 분석하고 시뮬레이션하기 위한 모델링에 많은 어려움을 가져오게 한다. 본 논문은 이러한 어려움을 해결하기 위하여 객체지향 페트리네트를 이용한 생산시스템 모델링 및 분석 도구를 제사한 것이다. 기본적인 구조는 페트리네트를 객체의 개념으로 구성하는 것이다. 객체의 개념으로 페트리네트를 구성하고 시스템의 행태는 객체간의 메시지 교환과 객체내의 행태로 표현된다. 시스템 분석에 있어서는 객체간의 메시지 전달관계와 객체내의 행태 분석 등이 가능하다. 대상 시스템이 객체의 클래스 개념으로 구성되기 때문에 복잡도가 많이 감소될 수 있다. 특히 본 논문에서는 상속성의 개념을 객체 지향 페트리네트에서 어떻게 구현할 것인가에 대한 방법과 분석 방법이 제시되었다.

• Journal of the Korean Association of Geographic Information Studies
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• v.6 no.2
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• pp.33-45
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• 2003

This paper defines the prototype of the geographic-object field that links the geographic-object and the geographic-field using an object-oriented geographic information system, and then implements the flood simulation in the saemangeum water resources management system that manipulates the water quantity of saemangeum lake and the height of gate using the watershed-object field. This paper combines the natural phenomena with the artificial phenomena that occurs on the water resources of the saemangeum, and designs the object oriented class hierarchy that is composed of the total watershed-object field, and then presents the algorithm for flood control. To visualize the class hierarchy of the whole geographic-object field and the partial geographic-object field, I use the UML(Unified Modeling Language). Attributes and methods of each class can acquire the functional reusability and compatibility using the COM of the ZEUS and the Visual Basic 6.0 of Win32 APIs. By means of implementing the flood simulation in the Saemangeum water resources management system, finally, this paper contributes on the efficient management of water resources.

• The Transactions of the Korea Information Processing Society
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• v.2 no.4
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• pp.567-580
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• 1995

A transition-based Objet-oriented programming system(TOPS) is a transition-based object-oriented system suitable for development of various concurrent systems.A TOPS consists of a collection of interacting structural active objects(SAOs),and their behaviors are determined by the transition statements provided in their class definitions.Furthermore,SAOs can be structurally and hierarchcally composed from their component SAOs like hardware commponents. These features allow SAOs to model components for circuit simulation more naturally than passive objects used in ordinary object-oriented programming. Also,we can easily add new kinds of components by using the inheritance mechanism.Executions of transition statements may be eventand/or time-driven, and hence digital,and mixed-mode simulation is possible.Prototype simulation programs with graphical user interfaces have been developed as TOPS progrms for digital,analog,and mixed-mode circuit simulation.

• Journal of Korean Port Research
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• v.14 no.1
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• pp.47-55
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• 2000

In order to cope with the changes of container terminal situation in these days, many simulation studies for container terminal have been accomplished. But previous simulation studies using simulation language have limitations in model representation and difficulties in modeling of large scaled container terminal system. To make these problems better, this paper addresses an object-oriented simulation of container terminal system using a DEVS formalism. The DEVS(Discrete Event System Specification) formalism, developed by Zeigler, supports specification of discrete event system in a hierarchical and modular manner. The formalism provides a mathematical basis for studying discrete event systems with better understood and sounder semantics. In a step of system modeling, a DEVS formalism aims at the exact system modeling that has a basis of semantics and utilizing the object-oriented manner can flexibly cope with the changes of system environment. In this study a model is developed and verified through the simulation of some alternatives.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 1999.10a
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• pp.35-42
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• 1999

In order to cope with the changes of container terminal situation in these days, many simulation studies for container terminal have been accomplished. But established simulation studies using simulation language have restrictions in model representation and difficulties in modeling of large scaled container terminal system. To make these problems better, in this paper addresses object-oriented simulation of container terminal system using a DEVS formalism. In a step of system modeling, using a DEVS formalism aim at the exact system modeling that has a basis of semantics and utilizing the object-oriented manner can flexibly cope with the changes of system environment. In this study a model was developed and verified through the simulation of some alternatives.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1994.04a
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• pp.557-557
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• 1994

• Proceedings of the Korea Society for Simulation Conference
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• 2000.04a
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• pp.84-90
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• 2000

인터넷을 발전에 따라 데이터의 전송량이 음성 전송량을 능가하고 있으나 현재의 네트워크로는 빠르고 신뢰성 있는 데이터의 전송을 보장할 수 없다. 데이터와 음성 모두의 빠르고 신뢰성 있는 전송과 관리를 위하여 개발된 패킷 중심 네트워크를 NGN이라 한다. NGN에서는 효율적인 전송과 관리를 위하여 기존(PSTN)의 교환기의 콜 에이전트를 소프트웨어로 구성하여 범용컴퓨터에서 운용될 수 있도록 하였다. 본 논문에서는 콜 에이전트를 소프트웨어로 설계하기 위하여 H/W 개발을 위하여 설계된 기본호처리모델인 BCSM을 객체지향방법론의 표준인 UML을 이용하여 설계를 하였다. 그리고 설계된 모델의 검증을 위하여 LSL(LarchShared Language)를 이용하여 정형명세를 하였다.

• Journal of Internet Computing and Services
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• v.3 no.4
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• pp.61-69
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• 2002

Measurement of the object, messages, clones, capsulation, inheritance, etc. that are conventional object-oriented paradigm characteristics as a method of measurement of the complexity of object-oriented programs has been reported. In this paper, the measures that are helpful to designing and coding of JAVA program, which is the representative language of object-oriented programs, are applied to six measures(i,e., Halstead's Program Volume, Program Level, Program Impurity, Macabe's Cyclomatic Number, Handerson-Seller's lock of cohesion in method and Sullivan's PVG.) suggested in the present study by referring to several actual programs as example for comparative analysis.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.1065-1067
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• 2015

시스템 모델링은 규모와 크기에 따라서 방법이 모두 다르며, 시스템 요구사항에 따라서 설계를 하는 방법이다. 하지만 현재까지의 기법은 개별적인 방법만 고려했기 때문에 시스템 요구사항의 모든 것을 적용하기 어려운 단점이 있다. 따라서 요구사항에 따른 시스템의 완성도를 높이기 위해서는 복합적인 모델링 방법의 접근이 필요하다. 본 논문에서는 절차지향 및 객체지향 모델링 방법에 대한 접근을 통합 할 수 있는 DEVS기반 하이브리드 모델링 기법에 대해 제안한다. 제안하는 기법은 프로세스와 객체와의 관계를 계층형으로 구조화 시킬 수 있으며, 수학적 명세가 가능하다. 또한, 하이브리드 모델링의 시뮬레이션을 위한 분산처리 환경에서 DEVS 기반 하이브리드 시뮬레이션에 대해 제안을 한다. 제안하는 모델을 통해서 복잡한 시스템에 대한 명세와 검증이 가능하다.

• Transactions of the Korean Society of Automotive Engineers
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• v.11 no.5
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• pp.147-155
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• 2003

The application of object-oriented modeling to develop a powertrain performance simulation program, called O-DYN, is introduced. Powertrain components, such as the engine, transmission, shaft, clutch are modeled as classes which have data and method by using object-oriented modeling methodology. O-DYN, a performance simulation program, based on the object-oriented modeling is made in C++. One powertrain simulation using O-DYN is proposed, and it is expected that the simulation program or individual class constructed in this paper would be useful for automotive engineers to predict the performance of powertrains and to develop a simulation program.