• 한국IT서비스학회:학술대회논문집
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• 2005.11a
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• pp.536-542
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• 2005

기업의 Business Process가 복잡해지고 B2B가 증가로 인하여 기업 내 혹은 기업간 Business Process를 통합하고 자동화하여 효율적으로 업무를 처리할 때 SOA 기반의 비즈니스 프로세스의 통합 툴의 필요하다. 본 논문에서는 재 사용성과 변경 용이성을 위해 개발한 다양한 업무 EJB 컴포넌트 형태들을 서비스 기반 아키텍처 상으로 전환하기 위한 서비스 기반 애플리케이션 개발 프레임워크를 제시한다. 제시한 서비스 기반 프레임워크는 기존 CBD 기반 업무 컴포넌트를 웹 서비스로 전환하기 위한 자동화 툴뿐만 아니라 웹서비스와 EJB까지 포함한 형태로 복합 어플리케이션을 개발할 수 있는 Orchestration Server까지 포함하고 있다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2003.11a
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• pp.271-274
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• 2003

본 논에서는 In-Process COM Component 기반의 DirectShow를 분산환경에서 적용하기 위해 해결해야 할 문제점을 분석하고, 해결방법을 제시한다. Microsoft사에서 제공하는 DirectShow는 Multimedia 데이터 처리용 라이브러리와 이 라이브러리를 사용하는 응용프로그램을 용이하게 제작하기 위한 Framework이다. DirectShow의 라이브러리는 COM기술을 사용하여 제작되기 때문에 재사용 및 유지보수가 용이하다. 하지만, DirectShow는 주로 멀티미디어 데이터의 재생을 위한 기술로서 멀티미디어 서버와 같이 여러 Encoder와 다중화기와 같은 기능을 구현하는데 많은 문제점이 있다. 특히, multi-Protocol Encoder와 같이 계산양이 많은 작업을 해야 할 경우 분산환경을 사용해야 한 필요가 있다. 본 논문에서는 네트워크의 분리되어 있는 두개의 필터를 연결하기 위해 필터간의 메시지 교환을 대리하는 Proxy 필터를 설계/구현하였다. 이러한 Proxy 필터를 사용하면 기존의 필터를 수정하지 않고 사용할 수 있는 장점을 갖고 있다. 특히 Binary로 배포된 필터와 연동하여 사용할 수 있다. 구현된Proxy 필터를 데이터 방송 서버에 활용함으로써 그 기능을 검증하였다.

• Journal of Information Technology Services
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• v.9 no.2
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• pp.193-203
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• 2010

Service-Oriented Architecture (SOA) is a new trend for the design of application architecture to enhance the degree of share and reuse with the concept of service. It comes from the current situation where the business environments are changing rapidly and therefore competitions are getting bitter. To cope with such business challenges, business (and/or applications) architecture needs considerably flexibility and reusability, and that's why SOA is accepted as one of the most effective framework for the business applications in these days. In this paper we propose an analysis and design methodology for the applications of SOA. To implement the proposed methodology, the service ontology needs to be defined first, and the tasks such as service profiling, workflow design and service orchestration need to be followed. To validate the expected effects on flexibility and reusability, the proposed methodology was compared with CBD (Component Based Development).

• Proceedings of the KIEE Conference
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• 1994.11a
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• pp.33-35
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• 1994

This Paper Presents a practical approach to evaluate the reliability indices of electric distribution systems. The use of reliability evaluation is placed with the framework of distribution system planning. In this paper, the reliability model is based on an analytical method, connecting component failure to load point outage each section. five case studies are reported in the paper. These are to study the effect of varying failure rates and repair times on distribution feeders. The results of a study on sample system are presented in this paper.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1201-1202
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• 2007

Safety critical systems are those in which a failure can have serious and irreversible consequences. Nowadays digital technology has been rapidly applied to critical system such as railways, airplanes, nuclear power plants, vehicles. The main difference between analog system and digital system is that the software is the key component of the digital system. The digital system performs more varying and highly complex functions efficiently compared to the existing analog system because software can be flexibly designed and implemented. The flexible design make it difficult to predict the software failures. This paper reviews safety standard and criteria for safety critical system such as railway system and introduces the framework for the software lifecycle. The licensing procedure for the railway software is also reviewed.

• Asia pacific journal of information systems
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• v.9 no.1
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• pp.59-75
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• 1999

Currently, many companies are trying to be more competitive by implementing the most appropriate software package, called ERP (Enterprise Resource Planning). ERP can support the company's business process. A repository, which can store and retrieve enterprise-wide information, is a key component of such software package. This paper implements an enterprise repository for the ERP. A well-known repository standard, IRDS (Information Resource Dictionary System), is employed for the repository architecture. The proposed metadata schema can help develop database, business applications, models, and workflow. To illustrate the practical usefulness, a real-life ERP prototype is built within the framework of the proposed repository.

• Language and Information
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• v.9 no.1
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• pp.19-34
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• 2005

Ontology is an indispensable component in intelligent and semantic processing of knowledge and information, such as in semantic web. However, ontology construction requires vast amount of data collection and arduous efforts in processing these un-structured data. This study proposed a methodology to automatically construct and generate ontologies from Sejong Electronic Dictionary. As Sejong Electronic Dictionary is structured in XML format, it can be processed automatically by computer programmed tools into an OWL(Web Ontology Language)-based ontologies as specified in W3C . This paper presents the process and concrete application of this methodology.

• Knowledge Management Research
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• v.11 no.4
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• pp.21-39
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• 2010

Recommender system is a core component of e-commerce. Correspondingly, metrics to evaluate the system performance have been developed and applied. However, even though we have lots of applications that have tried to adopt recommender systems, the dearth of successfully installed recommender systems for more than a decade leads us to a skeptical thinking that current metrics do not sufficiently indicate the recommender system success in business viability point of view. Hence, the purpose of this paper is to reconfigure measures for recommender system success. Adopting DeLone and McLean's amended model of information system success as the underlying framework, content analysis with intellectual properties on recommender systems was conducted to modify the currently used metrics. Then a model of recommender system success is proposed based on the newly identified metrics are compared with traditional metrics.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.406-408
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• 2001

소프트웨어 개발 기술은 컴포넌트의 재사용에 기반한 소프트웨어 개발 방법으로 발전하고 있다. 컴포넌트는 재사용 및 가변성을 족친시키며, 시스템의 전반적인 복잡도를 감소시켜 준다. 그러나 컴포넌트 조립정보는 디자인시점(design-time)에서 결정되고 특정 컴포넌트 모델과 컴포넌트 실행환경(Component Execution Environment)에 따라 소스코드에 반영되기 때문에, 시스템의 변경 관리 및 동적인 구성등의 소프트웨어 컴포넌트의 장점을 반영하지 못하고 있다. 본 논문에서는 현재 사용되고 있는 컴포넌트 컴포지션의 문제점을 제시하고, 이를 해결하기 위하여 컴포넌트 컴포지션시 필수적 정보들인 컴포넌트간의 상호작용, 컨텍스트 상의 종속성, 메시지 전달 및 호출상의 제약 조건 등의 기본 컴포지션 정도들을 표현하는 컴포지셔널 컨트랙트를 정의한다. 컴포지셔널 컨트랙트는 모든 정보를 컴포닌트 모델 및 환경에 의존적이지 않도록 XML 문서로 정의되므로, 각종 컴포지셔널 컨트랙트를 이용하여 컴포넌트 기술의 가장 큰 장점인 플러그-앤드-플레이(Plug-and-Play)방식의 지원 및 동적 바인딩, 동적 컴포넌트 컴포지션을 지원하는프레임워크를 제시한다.

• The KIPS Transactions:PartD
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• v.17D no.6
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• pp.415-422
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• 2010

This paper proposes service-oriented composition and verification techniques for incrementally extracting high-level abstract behavior of unit components in a systematic manner. Proposed techniques include the definition for abstract component, which is a basic building-block of the abstraction process, an algorithm for port-based synchronized abstraction, and projection abstraction. A verification framework is developed using the proposed techniques and its efficiency is demonstrated through a case example.