• Journal of Institute of Control, Robotics and Systems
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• v.5 no.1
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• pp.115-121
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• 1999

Advanced digital computer technology enables the computer-based controllers to replace the traditional analog controllers used in factory automations. This replacement, however, brings up the side effects caused by the quantization error and non-real-time execution of control software. This paper describes the structure of real-time simulator and controller that can be used for design and verification of real-time digital controllers. The virtual machine concept adopted by the proposed real-time simulator makes the proposed simulator be independent from the specific hardware platforms. The proposed system can also be used in the loosely coupled distributed environments connected through local area network using real-time message passing algorithm and virtual data table based on the shared memory mechanism.

• Asia pacific journal of information systems
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• v.6 no.2
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• pp.53-76
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• 1996

최근 들어 많은 정보 시스템들이 클라이언트/서버 환경에서 개발되고 있다. 클라이언트/서버 정보 시스템은 기존의 정보 시스템에 비해 복잡도가 높은 시스템이므로, 시스템 개발 시 체계적인 개발 방법론의 적용이 필요하다. 객체 지향 개발 방법론은 객체 지향 개념에 기반하여 시스템의 재사용성, 확장성, 신뢰성, Scalability를 증진시킬 수 있는 방법론이다. 본 연구에서는 객체 지향 방법론에서 클라이언트/서버 정보 시스템 설계 작업을 체계적으로 수행하기 위한 기법과 절차를 제시한다. 이러한 기법은 설계 작업시 사용자 인터페이스에 대한 충분한 고려가 가능하고, 설계 객체의 규명을 체계적으로 지원하고, 응용 시스템 논리를 일관성 있게 배분할 수 있도록 도와준다. 한국과학기술원의 인텔리전트 캠퍼스 프로젝트에서 개발된 학사 시스템의 적용 사례와 함께 본 연구에서 제시하고 있는 객체 지향 설계 기법에 대해 소개한다.

• Proceedings of the Korea Contents Association Conference
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• 2003.11a
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• pp.157-160
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• 2003

Web services can be invoked statically using a WSDL service interface and service implementation documents, or dynamically by retrieving the service type definitions and the service implementation via UDDI. But until now, couldn't do both at the same time. The Model View Controller pattern(MVC) supports both dynamic and static Web services. The MVC paradigm is a way of breaking an application, or even just a piece of an application's interface, into three parts: the model, the view, and the controller. Object-oriented methodologies have been applied to developing internet applications for increase reuse and expandability. I supposed a effective multimedia CMS(Contents Management Systems) using MVC.

• Journal of the Korea Society for Simulation
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• v.5 no.2
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• pp.25-40
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• 1996

Modeling of systems for intensive knowledge-based processing requires a modeling methodology that makes efficient access to the information in huge data base models. The proposed level access mothodology is a modeling approach applicable to systems where data is stored in a hierarchical and modular modules of active memory cells(processor/memory pairs). It significantly reduces the effort required to create discrete event simulation models constructed in hierarchical, modular fashion for above application. Level access mothodology achieves parallel access to models within the modular, hierarchical modules(clusters) by broadcasting the desired operations(e.g. querying information, storing data and so on) to all the cells below a certain desired hierarchical level. Level access methodology exploits the capabilities of object-oriented programming to provide a flexible communication paradigm that combines port-to-port coupling with name-directed massaging. Several examples are given to illustrate the utility of the methodology.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.21 no.48
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• pp.177-184
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• 1998

최근까지 개발된 시뮬레이션 소프트웨어를 검토 정리한 후, 시뮬레이션 소프트웨어와 그 모델과의 연관성을 파악하기 위하여 총체적인 시뮬레이션 모델을 관찰하였으며, 시뮬레이션 소프트웨어의 유연성에 대한 근원을 시스템 모듈식 접근 방법을 통하여 추적하였다. 실존 시스템, 모델, 그리고 소프트웨어 시스템과의 관계를 조사한 결과 시뮬레이션 소프트웨어의 주요한 성능 척도는 flexibility와 accuracy라는 것이 밝혀졌다. 객체지향 시뮬레이션 소프트웨어의 metrics와 formalism의 모델을 개발하였으며, 이것은 유연한 객체지향적 시뮬레이션 소프트웨어 구조를 디자인하는데 근본 방침을 제시한다. 끝으로 앞에서 개발한 모델을 기초로, 유연한 객체지향적 시뮬레이션 소프트웨어 시스템을 분석하였다.

• Management Science and Financial Engineering
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• v.7 no.1
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• pp.27-39
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• 2001

The multi-projective model considers attributes and the relationships among attributes called projections. The critical features of the multi-projective model are the way of relating attributes in the description of the system, the way of reasoning incomplete projections, and the determination of connected patterns between projection. In order to get a full picture of the system, we build a set of projections. The multi-projective model can be thought of as projections of a multi-dimensional reality onto simplified “model space”. The multi-projective database modeling approach used in this paper unified the ideas and terminology of various database models. Most importantly, the multi-projective modeling is presented as a tool of database design in the relational and other database models.

• International Journal of Fuzzy Logic and Intelligent Systems
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• v.2 no.1
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• pp.70-77
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• 2002

This paper describes a design driven approach to drive intelligent test plan generation based on adaptive use case (3,5). Its foundation is an object-oriented software design approach which partitions design schema into design architecture of functional components called “design component”. A use case software development methodology of adaptive use case approach developed in I.I .T is employed which preserves this unit architecture on through to the actual code structure. Based on the partition design schema produced during the design phase of this methodology, a test plan is generated which includes a set of component and scenario based test. A software metric is introduced which produces an ordering of this set to enhance productivity and both promote and capitalize on test case reusability, This paper contains an application that illustrates the proposed approach.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2003.04a
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• pp.33-38
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• 2003

There have been continuous efforts for developing the automatic mechanical design system to increase the efficiency of the tedious design process. However, these efforts have been concentrated on single platform application. Hence, the developed systems have been available only in a designated place and time and have been difficult to modify. It is proposed in this study that a web-based design system is developed to offer more reliability and convenience without any restriction of tine and place. The developed system is programed based on Java, and architecture of the system has object-oriented features of Servlet and JSP and is independent on any operating systems. The developed system has been applied to the initial design of multi-stage gear dirves but however as the framework of the developed system is quite versatile, its application to automatic design of any mechanical system or evaluation can be easily expected.

• 제어로봇시스템학회:학술대회논문집
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• 1992.10b
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• pp.446-451
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• 1992

In this paper, we propose a method to manage production system easily for operators when either equipments or products are changed. And we explain the scheduling AI tool which realizes the proposal method. The tool's knowledge expression consists of models, rules, mathematical expression and fuzzy logic. The model expresses the relations between products and manufacture, and properties of products. The models are separated into three type, equipment model, operation model, and product model. These models are classified by applicable fields as the assembly process or continuous plant process, The model expression of each type is based on object oriented paradigm. We report systems utilizing our approach.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.13 no.2
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• pp.54-60
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• 2004

There have been continuous efforts for developing the automatic mechanical design system to increase the efficiency of the tedious design process. However, these efforts have been concentrated on single platform application. Hence, the developed systems have been available only in a designated place and time and have been difficult to modify. In this study a web-based design system is developed to offer more reliability and convenience without my restriction of time and place. The developed system is programmed based on Java, and the architecture of the system has object-oriented features of Servlet and JSP and is independent on my operating systems. The developed system has been applied to the initial design of multi-stage gear drives, but as the framework of the developed system is however quite versatile, its application to automatic design of my mechanical system or evaluation can be easily expected.