• Proceedings of the Korea Information Processing Society Conference
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• 2003.05c
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• pp.1817-1820
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• 2003

최근 급격히 보급되고 있는 정보기기 종류의 다양화와 인터넷의 급속한 확산됨에 따라 이동내장형 시스템에 탑재하기 위한 기술로 다양한 이기종 제품간의 호환성과 이식성 제공하는데 핵심 역할을 수행하는 자바가상머신(Java Virtual Machine)이 주목 밭고 있다. 이러한 내장형 시스템은 빠르고 신뢰성 있게 개발이 이루어져야 하나, 내장형 시스템을 위한 효율적인 방법이 부족하다. 이에 대한 대안으로 본 논문에서는 이동내장형 시스템에 탑재하기 위한 자바가상머신을 컴포넌트 설계하고, 실시간 속성 등을 고려한 컴포넌트 조립을 위한 명세기법에 대해서 제안한다.

• Journal of KIISE:Computing Practices and Letters
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• v.7 no.2
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• pp.151-164
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• 2001

Java, used as the most representative object-oriented language, isil becoming the popular language for Internet/Intranet based program development. Moreover, it is used for development language in a variety of areas such as component based development language. In the view of reuse and maintenance of developed program, quality evaluation of program is becoming a more important issue. So, metrics measurement for quality evaluation of program that is developed at present including existing Java application is necessary. However, it is necessary that whether existing object-oriented software metrics is suitable on Java program is to be validated So, in this paper, we build an automated metrics measurement system that needs to validate on object-oriented software metrics and wish to support metrics measurement that is to determine it. The purpose of this system is to support a precise quality evaluation tool. In this system, we apply the metrics classified by Briand. Briand classified the metrics by formalizing mathematically them to verify feasibility of existing object-oriented software metrics. Using the proposed system, we can make comparison and analysis of validation on existing object-oriented metrics by calculating quantitative information more rapidly from Java source program. If there is any problem in feasibility of the metrics, we can establish a suitable metrics on Java program by considering reiJ,1forcement of the existing metrics or proposing new metrics.

• Journal of Korea Spatial Information System Society
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• v.1 no.2 s.2
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• pp.5-20
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• 1999

Recently, the new software paradigm in information technology (IT) is the component-based development (CBD) technology that has brought as a result of the distributed computing environment (DCE). The CBD has reduced a program developing time and has been designed to make a distributed computing environment easier in the Internet and Intranet environments. These changes of software technology have influence on the geographic information system (GIS) and the CBD technology is highly needed as a point of view of the technique and policy of the geographic information system. In this paper, we designed and implemented an Enterprise Server for the efficient development and management of GIS components. Especially, the Enterprise Server was developed with the Enterprise JavaBeans Specification 1.1 that had been proposed as an industry standard by the Sun Microsystems. The Enterprise Server can allows users to manage the Unified Modeling Language (UML) and Design Patterns for the development of GIS components, develop a GIS component container which obeyed the Open Geodata Interoperability Specification (OpenGlS), manage spatial metadata through a spatial XML (eXtensible Markup Language) engine, and implement a TESTBED server for testing and verification of developed GIS components.

• Journal of KIISE:Software and Applications
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• v.30 no.5_6
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• pp.529-539
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• 2003

Due to the emersion of J2EE (Java 2, Enterprise Edition), many enterprises inside and outside of the country have been developing the enterprise applications appropriate to the J2EE model. With the help of the component model of Enterprise JavaBeans (EJB) which is the J2EE core technology, we can develop the distributed object applications quite simple. EJB application can be implemented by using the component-oriented object transaction middleware and the most applications utilize the distributed transaction. Due to these characteristics, EJB technology became popular and then the study for EJB based application has been done quite actively. However, the research of techniques for the performance monitoring during run-time of the EJB applications has not been done enough. In this paper, we propose the techniques for monitoring the performance of EJB Application on the run time. First, we explore the workflow for the EJB application service and classily the internal operation into several elements. The proposed techniques provide monitoring the performance elements between the classified elements. We can also monitor by extracting the performance information like state transition and process time of the bean which is related to the lifetime occurred during one workflow, and the resource utilization rate.

• Journal of KIISE:Software and Applications
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• v.28 no.12
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• pp.896-909
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• 2001

Recently, above 50 percentages of software are being developed based on distributed application platforms. And recent technologies such as EJB(Enterprise Java Beans)[1]COM(Component Object Model)[2] CORBA(Common Object Request Broker Architecture)[3] have been advanced for distributed component-based software development . Therefore a systematic development process is necessary to develop component based applications using distributed application platforms. However, most of component-base software development processes do not define concrete flows between tasks and relationships among artifacts of each task Also, distribution issues are not considered explicitly in most of component-based software development In this paper, we present an approach to analyze and design software based on distributed components. In this approach, we propose systematic guidelines for developing a software based on Unified process and the relationships among artifacts which are produced, Also we explicitly consider the distribution issues such as performance, fault tolerance, security, distributed transaction of CORBA environments.

• The Journal of Information Technology and Database
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• v.7 no.2
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• pp.1-15
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• 2000

The World-Wide-Web have many advantages as a front-end of database systems. Hence in Internet applications, such as E-Commerce systems, the requirements for Web-based database applications have been increasing. In this work we propose a framework for java-based Web database applications-JaWAF(Java-based Web Application Framework). JaWAF has the 3-tier architecture of Client/Server, and consists of database gateway, application server, and communication and message component. When this framework is applied to the database applications developments, it can provide advantages, such as ease understanding and fast implementations of the Web applications. Thus we can build 3-tier Web-based database application systems with high scalability and distributed processing capability. Database gateway in JaWAF works as a daemon process that connects to the database systems and waits for requests from clients, and supports state-oriented service between clients and database servers. Hence the performance of Web applications could be increasing.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.469-472
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• 2002

자바의 Jini 기술을 이용하여 네트웍에 분산된 Java 컴포넌트 소프트웨어를 동적으로 통합하기 위한 방법론을 제안한다. 통합대상 개별 컴포넌트는 Jini 인터페이스(interface)를 구현하도록 설계하거나 혹은 기존 컴포넌트를 포장한 것으로서 네트웍에 구성된 Jini federation 에 Jini Service 오브젝트로서 공개된 것이다. 통합의 주체는 Service Discovery Manager 와 같은 특별한 Jini 헬퍼클래스 기반으로 작성된 클라이언트 프로그램이다. 클라이언트는 지정된 조건 (Entry 오브젝트)을 충족하는 컴포넌트 소프트웨어를 네트웍으로부터 Service Template를 이용하여 검색, 다운로드 한 후 단일한 GUI 를 가지는 프로그램에 통합한다. 필요한 컴포넌트만을 필요할 때 사용할 수 있고, 영구 설치의 필요성이 없으므로 소프트웨어 개발과 배포에 대한 새로운 관점을 제시할 것으로 판단된다.

• The KIPS Transactions:PartD
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• v.8D no.6
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• pp.705-714
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• 2001

The computing systems of today expanded business trade and distributed business process Internet. More and more systems are developed from components with exactly reusability, independency, and portability. Component based development is focused on advanced concepts rater than passive manipulation or source code in class library. The primary component construction in CBD. However, lead to an additional cost for reconstructing the new component with CBD model. It also difficult to serve component information with rapidly and exactly, which normalization model are not established, frequency user logging in Web caused overload. A lot of difficult issues and aspects of Component Based Development have to be investigated to develop good component-based products. There is no established normalization model which will guarantee a proper treatment of components. This paper elaborates on some of those aspects of web application to adapt user requirement with exactly and rapidly. Distributed components in this paper are used in the most tiny size on network and suggest the network-addressable interface based on business domain. We also discuss the internal and external specifications for grasping component internal and external relations of user requirements to be analyzed. The specifications are stored on Servlets after dividing the information between session and entity as an EJB (Enterprise JavaBeans) that are reusable unit size in business domain. The reusable units are used in business component through query to get business component. As a major contribution, we propose a systems model for registration, auto-arrange, search, test, and download component, which covers component reusability and component customization.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.976-978
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• 2005

Java 플랫폼 기반 스크립트 언어인 Groovy는 Java와 같은 객체지향 언어지만 Java보다 훨씬 고급 수준의 언어로서 간결한 코드와 쉬운 프로그래밍 환경을 제공한다. Groovy가 제공하고 있는 기능 중에서 GroovyMarkup은 XML 문서와 같이 각각의 객체가 중첩된 트리 구조를 다루는 응용프로그램을 쉽게 생성할 수 있도륵 해준다. GUI 프로그램은 Component 및 Container 객체가 중첩된 구조로 이루어져 있으므로 GroovyMarkup을 이용하면 GUI 프로그램을 간결하고 쉽게 작성할 수 있다. 본 논문에서는 Java 플랫폼 GUI 중 최근 각광 받고 있는 SWT(Standard Widget Toolkit)를 Groovy에서 지원할 수 있게 GroovyMarkup을 확장하여 SWT Builder를 설계한다. SWT Builder는 마크업 형태로 기술한 SWT widget 이름과 속성을 SWT widget 객체와 일대일로 대응하는 구조로 설계된다. 따라서 GUI 프로그램의 골격을 구성하는 SWT Builder를 마크업 형식의 코드로 작성하고 GUI 컴포넌트 내의 이벤트 처리는 클로저(closure)를 이용함으로써 좋은 성능을 내는 GUI 프로그램을 비교적 쉽게 구성할 수 있다.

• Journal of Internet Computing and Services
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• v.5 no.1
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• pp.1-13
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• 2004

The effect of Application system with class units is not sufficient because of independency and reuse of Component elements due to component abstraction based on only source code. Therefore We need to apply design pattern approach to represent not only the problem abstraction but also information and relationship between system elements for generic solutions of specific domain, Also, it is essential to software reverse engineering acquiring the correct understandings of the system through examining the existing systems and utilizing the acquired knowledges as reusable resources. In this paper, the extraction algorithm with JAVA and the validity of applying reverse engineering with extracting design patterns from source codes of the existing object-oriented system; are devised. The architecture of automatic tool is designed and implemented for 1) automatic extraction of design patterns and 2) reuse tool for retrieving, editing and rebuilding of design patterns.