• Journal of the Korean Society for information Management
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• v.14 no.1
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• pp.183-206
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• 1997

The information Retrieval Protocol, Z39.50 is applied to the shared cataloging gateway. The history and functions of the Z39.50 are reviewed and the characteristics and the database update service of Z39.50 are taken into account in the notion of the shared cataloging. And for the test, one of the domestic on-line shared cataloging systems is adopted and newly remodelled using Z39.50 protocol. Two kinds of Z39.50 shared cataloging gateway models (th centralized shared cataloging gateway model and the distributed shared cataloging gateway model) are operated in Web server.

• The KIPS Transactions:PartD
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• v.12D no.4 s.100
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• pp.521-530
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• 2005

Many researches are going on with regard to issues and problems related to mobile database systems, which are caused by the weak connectivity of wireless networks, the mobility and the Portability of mobile clients. Mobile computing satisfies user's demands for convenience and Performance to use information at any time and in any Place, but it has many Problems to be solved in the aspect of data management. The purpose of our study is to design Mobile Query Processing System(MQPS) to solve problems related to database hoarding, the maintenance of shared data consistency and the optimization of logging, which are caused by the weak connectivity and disconnection of wireless networks inherent in mobile database systems under mobile client-server environments. In addition, we proved the superiority of the proposed MQPS by comparing its performance to the C-I-S(Client-Intercept- Server) model.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 1999.03a
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• pp.95-102
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• 1999

The web-based group collaborative systems are emerging as enterprise-wide information systems. Since data in group collaborative systems are apt to be shared among multiple concurrent users and modified simutaneously by them, the web-based group collaborative systems must support synchronous collaboration in order to provide users with synchronized and consistent views of shared data. This paper proposes an active web server which can facilitate synchronous collaboration in web-based group collaborative systems. To accomplish such a goal, the active web server manages dependency relationships between shared data and web browsers referencing them and actively propagates changing details of the shared data to all web browsers referencing them. And, this paper examines usefullness and effectiveness of the active web server to apply it to the ball-bearing design example of concurrent engineering design systems. The prototype system of the active web server is developed on a commercial Object-oriented Database Management System (ODBMS) called OBJECTSTORE using the C++ programming language.

• Proceedings of the Korea Database Society Conference
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• 1995.12a
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• pp.109-116
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• 1995

본 논문에서는 그룹웨어(groupware) 또는 CSCW(Computer Supported Cooperative Work) 사용자들이 공유할 데이터들을 그룹 공유 영역에 위치시킨 후 그룹 공유 영역 내의 공유 객체에 대한 접근을 그룹웨어 사용자들에게 제공하는 구조를 제시하고, 그룹공유 영역의 구현을 위해 실시간 그룹웨어 응용에 의존하지 않는 구조를 지닌 공유 영역 서버인 SAS(Shared Area Server)에 대해서 기술한다. 그룹웨어 응용에게 공유 영역에 대한 접근을 제공하는 SACI(Shared Area Client Interface)와 함께 SAS는 하이브리드 구조를 구성하고 SAS와 SACI 그리고 그룹웨어 응용 사이에는 비동기 메시지 전달 방식을 제공한다. 본 논문에서는 실시간 그룹웨어에서 사용하는 공유 객체에 대한 동시성제어를 다루면서 기존 연구와의 차이점을 기술한다.

• Korean Journal of Computational Design and Engineering
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• v.8 no.1
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• pp.48-54
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• 2003

In a design-to-manufacturing environment, the product data is shared by various CAD/CAM/CAE systems with little integration or substantial data redundancy. The main purpose of this paper is to build a database containing all the features required for STEP-NC machining and to show how a STEP-NC repository can support the complete process for machining. A STEP-NC database schema has been constructed and several query functions have been built for the purpose of implementing the retrieving system of a STEP-NC database. The EXPRESS data model of ISO 14649 has been mapped to the database data definition language of the Oracle database. To apply the STEP-NC database to an industry example, the ISO 14649 part program has been stored into the STEP-NC database. To implement example scenarios, the sample query interface has been built.

• Journal of the Korean Society for Library and Information Science
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• v.27
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• pp.365-390
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• 1994

The article sets forth a problem on international exchange and cooperation In the field of library and information science in the People's Republic of China from engles of academic and publication's exchange, It points out international exchange and cooperation between China and Korea should be developed from international exchange of publications and interlibrary loan to openning up standard, authority and current database on publications step by step. China and Korea should supply the database to all of the world, In order to come up to shared resources, the author has compared the Descriptive Cataloguing Rules for Western Language Materials, and the Bibliographical Description for Monographes with the Korean Cataloguing Rules for Description, and analyzed their different. In the end, the article presents the result that the documentation standardzation is the only way of accomplishing shared resources in the world from indentity of description for publications and materials, and unity of cataloguing rules.

• Proceedings of the KIEE Conference
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• 1997.11a
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• pp.555-557
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• 1997

This paper discusses a set of critical requirements in building and using a shared, integrated information management system for power distribution management and control. It then proposes a modem, object-oriented information system model for building such a system based on the current state of arts in database, GIS, and WWW technologies. The key of the proposal is that the shared database system should be the basis of integration efforts in power distribution management and control. A small-scale prototype is being developed to demonstrate the effectiveness of the proposed model.

• Journal of the Korean Operations Research and Management Science Society
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• v.20 no.3
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• pp.1-16
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• 1995

Group collaborative systems are recently emerging to support a group of users engaged in common tasks such as group decision making, engineering design, group scheduling, or collaborative writing. This paper provides an change management framework for the group collaborative system to facilitate managing dependency relationship between shared objects and dependent user views, and coordinating change and propagation activities between the two in distributed computing environments. Specifically, the framework adopts an object-oriented database paradigm and presents several object constructs capturing dependency management and change notification mechanisms. First, it introduces change management mechanisms with transient shared objects and secondly, it extends them into presistent object computing environment by integrating transaction management mechanisms and change notification mechanisms. A prototype change management framework is developed on a commercial object-oriented database management system.

• Journal of the Korean Society for information Management
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• v.9 no.1
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• pp.182-216
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• 1992

It is described about the construction of Union Bibliographic Database for online shared cataloging and its perspectives in the Dae-duck Science Park technical information centers and libraries.

• The Transactions of the Korea Information Processing Society
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• v.6 no.11
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• pp.2981-2988
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• 1999

A deductive database consists of facts being the extensional database and rules being the intensional database. Because of the difficulty of evaluating rules, many parallel evaluation algorithms for rules have been presented. But we have not gotten an acceptable result. This paper proposes a new methodology to evaluate proof-theoretic meaning of the linear recursion rule which contains transitive dependency by using a shared-nothing parallel architecture. As first, we prove that there exists the equivalent expression for a linear recursion rule, design the algorithm for evaluating the linear recursion rule based on the equivalent expression, and finally analyse performance of the proposed algorithm.