• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.545-547
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• 2003

본 논문에서는 고 가용성 및 신뢰성을 보장하는 클러스터드 EJB(Enterprise Java Beans)서버 환경에서 동일한 그룹에 속해 있는 분산된 모든 EJB서버들이 배포되는 어플리케이션들에 대해 동일한 이미지를 갖도록 하여 서비스하고자 할 때 사용자가 작성한 어플리케이션들을 동일한 그룹의 EJB서버들에 전송, 배포하고 유지하는 방법에 관한 것이다. 이러한 방법으로써 본 논문에서는 동일한 그룹에 속해 있는 모든 EJB서버들이 하나의 저장소를 사용하도록 함으로써 하나의 어플리케이션 이미지로 다중 배포할 수 있는 방법에 대해 논의한다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.394-396
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• 2002

본 논문에서는 고 가용성 및 신뢰성을 보장하는 클러스터드 EJB서버를 개발함에 있어 클러스터드 EJB서버환경에서 클러스터를 구성하는 각 노드에 어플리케이션(웹 컴포넌트와 EJB 컴포넌트)을 배포하는 기능, 각 노드에 배포된 어플리케이션들에 대한 동기화를 지원하는 기능 및 클러스터드 환경에서의 어플리케이션을 즉시 자동 배포하는 기능에 대해 논의한다.

• The KIPS Transactions:PartD
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• v.8D no.6
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• pp.637-644
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• 2001

EJB, providing specification for development and deployment of component based application, permits distributed development as central element of J2EE environment that manages automatically transaction management, persistence, concurrency control that are the most complicated work in enterprise environment. In this paper, we wish to resolve DAO's transaction logic complexity and performance reduction of system in the EJB based legacy system. Therefore, this paper describes the design and implementation of IDAO that applies Iterator pattern. IDAO gets effect that reduces complexity of transaction logic, system overload by database connection, and reduction of performance through container managed transaction.

• The KIPS Transactions:PartD
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• v.9D no.4
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• pp.703-712
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• 2002

Since component-based development technologies support reusability and enhance productivity of application development, they are adopted for rapid and efficient software development, and among them, EJB component is a Jana-based software development technology widely used in industry. In this paper, we designed and implemented bulletin board and shopping mall which are major constituents of mobile e-commerce system using EJB components, and suggest construction guideline supporting reusability and interoperability.

• ETRI Journal
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• v.25 no.6
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• pp.464-474
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• 2003

Component-based development leverages software reusability and reduces development costs. Enterprise JavaBeans (EJB) is a component model developed to reduce the complexity of software development and to facilitate reuse of components. However, EJB does not support component assembly by a plug-and-play technique due to the hard-wired composition at the code level. To cope with this problem, an architecture for EJB component assembly is defined at the abstract level and the inconsistency between the system architecture and its implementation must be eliminated at the implementation level. We propose a component-based application development tool named the COBALT assembler that supports the design and implementation of EJB component assembly by a plug-and-play technique based on the architecture style. The system architecture is first defined by the Architecture Description Language (ADL). The wrapper code and glue code are then generated for the assembly. After the consistency between the architecture and its implementation is checked, the assembled EJB components are deployed in an application server as a new composite component. We use the COBALT assembler for a shopping mall system and demonstrate that it can promote component reuse and leverage the system maintainability.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.534-536
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• 2000

EJB의 애플리케이션 개발환경은 객체지향 분산처리를 지원하는 컴포넌트를 개발하고 분산 배치를 위한 컴포넌트 구조이다. EJB를 이용하여 개발한 애플리케이션은 컴포넌트 모델의 개념을 결합하여 비즈니스 프로그램의 개발이 쉽도록 단순화시켰으며, 보안성, 리소스 풀링, 영구성, 동시성, 트랜잭션 무결성을 자동적으로 해결해 준다. 본 논문에서는 이러한 개발환경에서 EJB 컴포넌트가 충분한 유연성을 가질 수 있도록 기능별로 효율적인 빈의 유형을 추출하는 방법을 찾고자 하였으며, EJB 빈의 유형별 특성에 따라서 빈 유형을 쉽게 분류할 수 있는 방법을 표준화하여 시스템 분석 및 설계시 반영할 수 있도록 하였다. 본 논문의 제안모델은 단계별로 전 단계의 모델을 재사용하고, 객체를 쉽게 빈으로 매핑할 수 있도록 표현계층, 비즈니스 로직계층, 데이터계층으로 계층화하여 객체를 배치함으로써 빈의 유형을 쉽게 추출할 수 있는 방법을 제공한다.

• The KIPS Transactions:PartD
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• v.11D no.1
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• pp.153-162
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• 2004

Software development methodology using object-oriented analysis and design techniques for improving productivity and maintainability has acquired a substantial acceptance in both academia and industry as a fundamental paradigm. Enterprise Java Beans (EJB) is widely used in both academia and industry because it provides high unability and rapid application development. EJB supports object-oriented paradigm, but there are several things to consider when designing detail model of object-oriented model or implementing object-oriented model with EJB model. One of them is inheritance problem. In this paper, we classify the types of class inheritance which is shown upon in object-oriented model into three types and identify the problems which can happen when implementing the inheritance mechanism with EJB model. And this paper proposes three patterns for realizing the inheritance in EJB. Moreover, applicable patterns and guidelines for each object-oriented inheritance types for the proposed patterns are suggested.

• Journal of Internet Computing and Services
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• v.6 no.4
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• pp.125-139
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• 2005

Mobile e-business is in wide use with the rapid growth of wireless internet users. To meet the growing requests for mobile e-business the productivity of mobile applications has been demanded. The WAPSiteGen, introduced in this paper, automatically generates a 3-tier WAP application that needs a new application database or that already has an application database to increase the productivity. The WAPSiteGen generates the EJB components that handle business logic and the JSP Web components that process user-made queries and the WAP Push feature. For a presentation layer, it also generates the HTML forms for an application manager and the WML decks for end users, which consists of many cards. The WAPSiteGen enhances extendibility, reusability and portability of generated 3-tier applications by comprising such component technologies as EJB and JSP. Furthermore, it supports the WAP Push services for generated applications that provide necessary information to wherever and at whenever a user wants. Since the applications generated by the WAPSiteGen provide the information on an interested entity as well as the information on all the directly or indirectly related entities to the interested one, it shows faster information accessibility. In this paper, we explain the functionality and implementation of the WAPSiteGen and then show its merits by comparing the WAPSiteGen to commercial WAP application generators.

• The KIPS Transactions:PartD
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• v.11D no.1
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• pp.143-152
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• 2004

Recently, software programming method based on EJB for object oriented software design and implement has been used frequently. Usually, case that use permanent data that use Database in EJB base application is most. Part connected with Database-Access that take charge in Entity Bean class of server side creation program. In this paper using J2EE relationship DAO pattern class each separate. This is no much difference with existent pattern method, but in same pattern common classes are designed so that composition may be possible. And as well as use Entity Bean class that created each DBMS classes are different, is doing Rata Source so that connection work is available without alteration or creation of additional program in several DBMS environments.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.2
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• pp.366-373
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• 2005

In this paper, we propose the method of integrating the Book Lending Management System running either on local and web to develop Enterprise Application in distributed environment more easily and quickly using Sun's EJB based on the lava. We integrate the Book Lending Management System which is operated separately using EJB. And, by designing and implementing the Book Lending Management System separately according to its functions, it can reduce the cost of maintenance and repair. At all platforms where the Internet, Book Lending service is possible, because it provide Web based interface with JSP. Then, we can get platform independent implementation using EJB and JSP..