• Electronics and Telecommunications Trends
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• v.11 no.1 s.39
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• pp.49-64
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• 1996

Computer-Aided Control Engineerig(CACE) 프레임워크는 컴퓨터 제어시스템의 개발비용과 신뢰성에 대한 위기에 대처하여, 제어시스템 엔지니어링 분야의 독립적인 소프트웨어 패키지들을 상호 호환성 있게 통합하여 컴퓨터 제어시스템의 모델링과 구현, 유지보수 및 소프트웨어 재사용에 이르는 라이프사이클 전단계에 걸쳐 일관적으로 사용될 수 있어야 한다. 이러한 개념의 개방형 통합 소프트웨어 패키지 운영체제가 광범위한 응용분야에서 재사용될 수 있도록 하기 위해서는 다음과 같은 5가지 서비스 클래스를 제공하는 프레임워크라는 기반구조에 의해 개발되어야 한다. 프레임워크에서 제공하려는 서비스들은 여러 응용분야의 소프트웨어 패키지들을 통합적으로 운영하기 위하여 필수적으로 요구되는 서비스 개념으로서 데이터베이스 서비스, 모델정의 서비스, 태스크 운영 서비스, 사용자 대화 서비스, 프로세스 통신을 위한 메시지 서비스들이 존재한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.416-419
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• 2009

인터넷의 발달로 인해 최근 Software 분야는 복잡해지고 많은 분야에서 결정적인 산출물로 다양한 어플리케이션이 개발되고 있다. 또한 Software의 품질과 보증을 목적으로 테스팅의 규칙적인 방법이 요구되어진다. 본 논문에서는 다양한 Software Application의 테스팅을 위한 개발 방법으로 확장성과 융통성 그리고 재사용성을 위하여 테스트 케이스 추출을 위한 메타모델을 시각화하고 테스팅 단계별 요구되어지는 모델을 Unified Modeling Language를 이용한 개발 관점을 테스트 설계 모델과 테스트 제어 모델로 구분하여 제시하고 특정 시스템 도메인을 활용하여 테스트 실행 환경과 테스트 프로세스 설계에 대한 방법을 제안한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.3
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• pp.492-504
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• 1994

In ATM network was two QOS bearer services for flexible bandwidth assignment, various priority assignment buffer access mechanisms have been sugested. In this paper, a performance model with 3 state discrete time Markov proess in explicit priority assignment is suggested and cell loss probability is analytically derived. Also flexible space priority control mechanism with partial buffer sharing is studied and verified by simulation with OPNET.

• 전자공학회논문지 IE
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• v.45 no.3
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• pp.36-41
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• 2008

By considering decoupling between loops as a kind of measurable disturbance, a steady-state decoupling method based on feedforward compensation is proposed for a three-tank liquid level system often encountered in practical process control. In addition, the three-tank liquid level system's dynamic model with structure of two-input and two-output is presented according to its working principle. Finally simulation experiments given in C++Builder language demonstrate the effectiveness of the proposed method.

• Review of KIISC
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• v.22 no.6
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• pp.29-33
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• 2012

클라우드는 IT를 직접 소유하기 보다는 제3자가 제공하는 규격화된 요소들(소프트웨어, 플랫폼, 인프라구조 등)을 필요에 따라 셀프서비스 방식으로 사용하고 그에 따른 경비를 지불하는 모델을 포괄적으로 일컫는 용어이다. 그러나, 클라우드는 데이터를 집중 관리하므로 규모의 경제를 달성하는 데 용이하지만 악의적인 공격자에게는 더 매력적인 공격대상으로 간주되기도 한다. 이러한 모든 특징으로 인해 클라우드는 기존의 IT 환경에 비해 더 높은 수준의 보안 프로세스, 기술 및 의식을 요구하고 있다. 본 논문에서는 클라우드 서비스를 보호하기 위한 각종 보안 인증 스킴을 살펴보고, 아울러 클라우드 솔루션을 평가, 구현, 관리, 유지할 때 필요한 규정준수와 위험관리, 사용자 확인과 액세스 제어, 서비스 무결성, 종단점 무결성, 정보보호 등 핵심 보안 고려사항 5가지를 제안하였다.

• The Journal of Society for e-Business Studies
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• v.12 no.1
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• pp.151-166
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• 2007

As the number of users who are involved in a business process increases, it becomes imperative to effectively control their privileges of accessing sensitive data and information which are usually easily obtained by BPM system. Traditional RBAC (Role-based Access Control) model was first introduced to provide a logical framework to prevent unauthorized users from obtaining confidential, but in more dynamic environment such as B2B and SCM process, it usually lacks in capability of addressing such issues as configurability, customizability, or scalability of user privileges. In this study, we have proposed a privilege-template based RBAC model that can address such issues effectively. We also provided a design of the RBAC model along with illustrative examples and pseudo codes that can be used for implementing a prototype system.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.35S no.10
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• pp.94-117
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• 1998

This paper investigates the performance characteristics of the data link layer of the 1996 version of IEC/ISA fieldbus which is developed as internatioal standard of fieldbus. A discrete-event simulation model of the data link layer of IEC/ISA fieldbus is developed. Using the simulation model, this paper identifies the network parameters that influence the performance of prioritys scheme and real-time data transmission, and analyzes the delay performance of IEC/ISA fieldbus with respect to the change of network parameters. The simulation model also integrates continuous-time simulation model of a control system as application process. Using the integrated simulation model, this study investigates the effect of network-induced delay on the performance of control system. Since the simulation model developed in this study can predict the network performance, it will be effectively utilized in the design phase of control and automation systems that adopt the IEC/ISA fieldbus.

• Journal of the Korean Institute of Telematics and Electronics
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• v.20 no.3
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• pp.61-68
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• 1983

In this paper various aspects of statistical maltiplexing of data signs have been investigated. A queueing model with finite waiting room and batch poisson arrivals is studied assuming that data signals are transmitted at a constant rate. Using traffic intensity and average burst length as parameters, overflow probabilities and expected queueing delay due to buffering are obtained. Also, a real system model of a statistical multiplexer that can be directly used in micro-programmed hardware realization is proposed. To examine the performance of the system, computer simulation has been done at various conditions. The results obtained can be used in designing a buffer efficiently.

• Journal of Korea Game Society
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• v.5 no.1
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• pp.33-40
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• 2005

Game Designs & Developers that system designs improve, the product and the change of tasks to all developers are essential in achieving On-Line Game project. Existent Or-line Game project management designs supper the definition and the change of project activities, and configuration management designs support version check, workspace management, build management, etc. In this paper. the proposed Design defines Game component based development process model, and achieves recording of process progression, processing the request of change, reporting the progression of each task, product registering and change, version recording, artifact or form search, etc. using UML. Furthermore, study on the stake holders get the systematic management and standardization by sharing information that are necessary in Game design & development and configuration management in distributed environment using the system integrated management design.

• Journal of Korea Game Society
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• v.4 no.3
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• pp.21-28
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• 2004

Game Designs & Developers that system designs improve, the product and the change of tasks to all developers are essential in achieving On-Line Game project. Existent On-line Game project management designs supper the definition and the change of project activities, and configuration management designs support version check, workspace management, build management, etc. In this paper, the proposed Design defines Game component based development process model, and achieves recording of process progression, processing the request of change, reporting the progression of each task, product registering and change, version recording, artifact or form search, etc. using UML. Furthermore, study on the stake holders get the systematic management and standardization by sharing information that are necessary in Game design & development and configuration management in distributed environment using the system integrated management design.