• Journal of Korea Spatial Information System Society
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• v.3 no.1 s.5
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• pp.75-87
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• 2001

The advantages of using components result from their reusability between applications. Applications can be easily implemented by adding components. In this paper, we described the design and implementation process of ASC(Application Service Component) for component-based GIS applications. In our project, there are 5 applications : Road Facility Management, Urban Planning, Cadastral Map Management, Water Supply Management, and Sewerage Management. All of them use MapBase component which supports common GIS functionality. Although they are different applications, some parts of them are same. We analyzed the developed results in 1st and 2nd year, and the achievement of UIS(Urban Information System) project in Busan Metro City in Korea. The UIS of Busan was consisted of 5 applications to equal with our project. Then, we extracted 11 common used components between 5 applications, and implemented 5 common components of them and 2 additional components. They were Authority, GISReport, IndexMap, Measurement, Search, Symbol Manager, and Attribute Display. As we offered them to companies developing application components, they were able to reduce the development time.

• Journal of KIISE:Software and Applications
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• v.29 no.1_2
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• pp.10-19
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• 2002

In searching and locating a collection of components on the Web, users require a Web browser. Since the Web libraries tend to grow rapidly, there needs to be an effective way to organize and manage such large libraries. Traditional Web-based library(retrieval) systems provide various classification scheme and retrieval services to store and retrieve components. However, these systems do not include invaluable services, for example, enabling users to grasp the overall contents of the library at the beginning of retrieval. This paper discusses a Web-based library system, which provides the efficient management of object-oriented components and a set of services beyond simple component store and retrieval. These services consist of component comprehension through a reverse engineering process, automated summary extraction, and comprehension-based retrieval. Also, The performance of an automated cluster-based classification scheme adopted on the system is evaluated and compared with the cluster-based classification scheme adopted on the system is evaluated and compared with the performance of two other systems using traditional classification scheme.

• Journal of Korea Multimedia Society
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• v.5 no.1
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• pp.77-93
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• 2002

Now we are following component-based software development as a solution to improve the reusability, reliability, and extensibility of the software. To support these, the developed components must be reused through component repository at software development. However, traditional centralized repositories couldn't activate component markets since not only the number of users were restricted but also most of the provided components were those on clients like user interface and so on. Recently, a lot of server-side components, reused in a specific domain, have appeared thanks to the development of both Internet technology and component technology such as EJB, DCOM, etc. Therefore, component repositories, based on domain information, classify and provide components and must offer web-based service for many users to use it stably. This study introduces the implementation of a component repository based on J2EE application model. It provides application developers with the service to search and extract appropriate components, and supplies them reliable services in web environment.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.376-378
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• 2001

CBD(Component Based development)가 이미 완성된 소프트웨어 모듈인 컴포넌트들을 특정 목적을 위해 배치하고 조립함으로써 품질 보증된 고생산성의 재사용을 가능하게 됨에 따라, 최근 IT 비즈니스 솔루션 도출을 위한 핵심 적인 기술 전략으로 인식되고 있다. 따라서 영 역에 적절한 컴포넌트의 추출과 개발 및 응용 시스템으로의 전개를 위한 컴포넌트들의 배치와 조립 등을 포함하는 일련의 CBD 프로세스를 실제화 하기 위해서는 아키텍쳐 기반의 접근과 제어가 매우 중요하다. 하지만 대부분의 CBD 연구는 비즈니스 로직들의 기능성을 그룹화한 컴포넌트의 생산에 초점을 두고 있지 컴포넌트간의 상호작용을 명시하는 아키텍쳐 정보의 관리를 간과함으로써 컴포넌트의 조립과 통합을 통한 CBD 시스템으로의 전개는 극히 어려운 실정이다. 따라서, 본 논문에서는 CHD 프로세스 상에서 아키텍쳐 접근의 중요성과 전개 방법을 살펴보고, 컴포넌트 프레임워크(Component Framework)를 위한 아키텍쳐의 계층을 새롭게 재정의 하며 그 의미를 설명한다. 이를 위해 영역 분석 및 설계 정보를 선언적으로 명시하는 수단이며, 도메인 내에서 특정 서비스를 제공하는 컴포넌트간의 일반적 결합 방식의 규정하기 위한 수단으로서 설계 패턴을 이용하여 서비스 아키텍쳐 패턴을 정의하고 실 예로 적용한다.

• Journal of Korea Multimedia Society
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• v.11 no.5
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• pp.710-727
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• 2008

Service-oriented computing systems have been issued by their properties of reducing software development time and effort by reusing functional service units. The reusability of services can effectively promote through loose coupling between services. But strong associations of object-oriented systems such as inheritance and aggregation create a rather tight coupling between objects. The component-based systems without inheritance and aggregation create a loose coupling between components. Thus components provide service realization at runtime using the functionality provided by their interfaces. Therefore legacy component-based systems need to have service-oriented computing concept in order to support functional service units efficiently. Also, conventional methods for service-oriented computing system have not suggested the clear classification of service layers, the clear service identification guideline introducing service layers and a service mapping method between serviceces of each layer. Therefore we suggest the service classification and the identification guideline of business view and implementation view introducing layers and propose a mapping between two views. That is, we research service layers, service identification, diversified service sizes and a service mapping method between services of each layer. This can be applied to legacy component-based system to extend to the service-oriented computing system.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.405-408
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• 2001

지리 정보와 속성 정보를 바탕으로 사용자에게 다양한 분석 기능을 제공하는 인터넷 지리정보시스템은 지리정보서비스 사용자 층을 더욱 확대 시키고 있다. 그러나 이들 시스템은 개방성, 상호운용성을 지원하지 않으며 기능 및 데이터 지원 확장, 다양한 데이터 소스로의 접근 등의 어려움을 가지고 있다. 본 논문에서는, OGC(Open GIS Consortium)의 웹 지리정보서비스 아키텍쳐에 기반을 둔 상호운용성과 XML 기반 데이터서비스 등 개방형 웹 지리정보서비스 시스템을 설계, 구현한다. 또한, 컴포넌트 기반의 아키텍쳐를 바탕으로 단위 기능을 컴포넌트 형태로 제공함으로써 구축 비용 및 다양한 사양한 요구사항을 효율적으로 충족시킬 수 있다. 개발된 서비스 컴포넌트는 객체 지향형 모델링 툴인 UML(Unified Modeling Language)로 설계되었고, ATL/COM 과 C++ 환경에서 구축되었다. 이는 재사용성 뿐만 아니라 상호 운용성, 언어 독립성, 쉬운 개발환경 등을 제공한다.

• The Journal of the Korea Contents Association
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• v.4 no.4
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• pp.99-106
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• 2004

This paper describes main characteristics of Grid Services based on OGSA and a service component for aggregating service data element. In order to build a Grid Service for SOA, it needs to consider a systematic approach from the high-level software architecture of a system that describes the main system components and their interactions. The purpose of this paper is to design and implement an extended service data aggregator service. To provide reliable aggregating service for service data elements, which is running under wide area environment like Internet, the aggregator service is operated asynchronously by notification mechanism.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.313-316
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• 2004

본 논문은 현재 이종 분산 컴포넌트 기반 시스템간의 상호운용성을 부각하고자 한다. 컴포넌트 기반으로 개발된 시스템들이 이종의 플랫폼(CORBA, .Net, JAVA)들상에 각 컴포넌트의 고유 기능 자체 그대로 상호운용이 가능해야 할 것이다. 그러나 각각의 벤더들에 의해 독자적으로 개발된 컴포넌트 모델/시스템을 사용하여 컴포넌트 표준화나 통합화에 많은 노력이 필요로 한다. 이는 시스템간의 상호운용성을 해결하는데 있다. 본 논문에서는 컴포넌트 상호운용 성숙도 모델(CIMM)을 언급하고 웹 서비스를 이용한 이종 분산 컴포넌트 기반 시스템 간의 상호운용성에 대해 상호운용 성숙도 모델(IMM)로 상호운용 수준평가을 통해 향상 방안을 제시하고자 한다.

• Journal of KIISE:Software and Applications
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• v.37 no.4
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• pp.239-251
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• 2010

In modern distributed enterprise applications that have multilayered architecture, business entities are a kind of crosscutting concerns running through service components that implements business logic in each layer. When business entities are modified, service components related to them should also be modified so that they can deal with those business entities with new types, even though their functionality remains the same. Our previous paper proposed what we call the DTT (Data Type-Tolerant) component model to efficiently process the variability of business entities, which are data externalized from service components. While the DTT component model, by removing direct coupling between service components and business entities, exempts the need to rewrite service components when business entities are modified, it incurs the burden of implementing data type converters that mediate between them. To solve this problem, this paper proposes a method to use ontology as the metadata of both SCDTs (Self-Contained Data Types) in service components and business entities, and a method to generate data type converter code using the ontology. This ontology-based DTT component model greatly enhances the reusability of service components and the efficiency in processing data variability by allowing the computer to automatically generate data type converters without error.

• Proceedings of the Korea Database Society Conference
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• 2008.05a
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• pp.369-377
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• 2008

This paper is to provide the method of dynamic service composition in ubiquitous environment. This method is extended of Service Component Architecture, which is a standard about service composition. This standard only supports service composition in system design time. It has problem we cannot it ubiquitous environment, requests dynamic service composition. To solve this problem, we suggest dynamic service composition method based on SCA.