• Journal of Korea Multimedia Society
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• v.5 no.4
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• pp.468-476
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• 2002

Nowadays for reliable software and cost reduction there are many research works on software development based on component. One of the challenge in designing a component-based system is determining which components are required and where they fit in the overall system architecture. In this paper, we developed a EJB component for transforming RDB instances to XML documents. Accordly users can build XML applications based on relational database just by assembling this component. Consequently they can reduce time and cost for developing their XML applications.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.343-345
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• 1999

데이터베이스 시스템은 실세계에서의 객체들이 다양한 모델링을 통하여 구축된 데이터베이스에 대해 검색, 갱신, 분석 출력 및 논리적인 일관성 제어 등을 할 수 있는 소프트웨어 시스템이다. 그러나 전통적인 데이터베이스 시스템은 시간에 따라 변화하는 데이터의 이력을 관리 할 수 없다. 따라서 이력정보(Historical Informations)를 관리할 수 있게 하기 위해서는 시간차원의 확장이 필요하다. 즉, 기존의 데이터베이스 시스템이 제공하지 못하였던 각 정보들의 이력관리와 이력을 이용한 다양한 서비스를 가능하게 하도록 시간차원을 지원할 수 있는 데이터베이스 시스템을 시간 데이터베이스 시스템이라 하며, 이를 위하여 이 논문에서는 객체관계형 데이터베이스 시스템을 기반으로 객체관계형의 특징과 레이어 개념을 이용하여 새로운 시간차원을 확장함으로써, 기존의 시스템을 현 상태로도 유지할 수 있는 시간 데이터베이스 시스템을 말한다.

• Journal of KIISE:Databases
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• v.30 no.6
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• pp.585-592
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• 2003

In the spatial database systems, it is necessary to manage spatial objects that have two or more aspatial information with different security levels on the same layer. If we adapt the polyinstantiation concept of relational database system for these spatial objects, it is difficult to process the representation problem of spatial objects and to solve the security problem that is service denial and information flow by access of subject that has a different security level. To address these problems, we propose a polyinstantiation method for security management of spatial objects in this paper. The proposed method manages secure spatial database system efficiently by creating spatial objects according to user's security level through security-level-conversion-step and polyinstantiation-generation-step with multi-level security policy. Also, in case of user who has a different security level requires secure operations, we create polyinstance for spatial object to solve problems of service denial and information flow.

• Journal of Korean Society of societal Security
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• v.2 no.1
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• pp.81-89
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• 2009

A web-based information management system to share engineering data of truss bridge is developed through construction of standardized database of truss bridge. 3D shape information is stored in database according to AP 203 of STEP, and 3D visualization on the web is implemented by using the web 3D technology that helps users to understand geometrical shape of structures, directly. AP209 is used to store structural analysis information such as finite elements, material properties, and analysis result into relational database. Based on the developed database, a prototype of integrated information management system for truss bridge is developed, and it provides additional information such as specifications and inspection information related with shape object to end users.

• Journal of Internet Computing and Services
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• v.4 no.2
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• pp.21-30
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• 2003

This paper is to describe how to refer to software objects and reuse them through the web browser so that ail the members of the software development team can collaborate with each other on the development procedure, In addition, we describe how to convert the $ ^*$,mdl design information generated from the UML editor into their corresponding XML data, which is arranged to be saved in the relational database system. Furthermore, we provide a facet retrieval system based on which makes use of a object-oriented thesaurus, which supports an integrated environment through which all the project team members can share a lot of source codes and execution files as weil as object files produced from the web-based collaborative development environment. Finally, we have designed and implemented a web version management system that facilitates software developers to manage in their web-based search for the relationship of design informations.

• Journal of the Korea Computer Industry Society
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• v.5 no.9
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• pp.1043-1054
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• 2004

The area of business applications in the internet are extended enormously in result of fast development of computing and communication technologies, increase of internet use, and use of intranet/extranet in enterprise information system. In recent days network computing technologies have been developed rapidly and the extended use of Internet applications for enterprises such as intranet/extarnet in and between enterprises has been increased enormously. Therefore the business in the future will be executed by Electronic Commerce based on Business to Business(B2B). <중 략) This paper introduce the design and implementation of the data sharing support system that can be accessed data transparently by the users of participated enterprises in the integrated data environment supporting B2B Electronic Commerce. The system uses Java/CORBA technology in Web environment, relational and object-oriented database system, Object Query Language (OQL) to process the queries of the file information.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.91-94
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• 2005

공학적 기반의 응용 프로그램에서는 복합관계(complex relationship) 및 복합객체(complex object)의 개념이 요구되는데, 이러한 개념들은 비즈니스 응용에 적합한 관계형 데이터베이스로 다루기에는 저장과 검색 시 많은 문제점을 야기한다. 이와 같은 문제점을 해결하기 위해서 객체 관계형 데이터베이스 시스템이 출현하게 되었다. 한편, 고전적인 데이터베이스 설계 기법은 개체 관계형 모델(Entity Relationship Model)과 같은 개념적 모델을 사용하며 데이터 중심의 구조적 관점(structural aspect)만을 고려하는 반면, UML(Unified Modeling Language)같은 객체지향형 설계 도구를 사용하여 데이터베이스를 설계할 경우 구조적 관점 및 행위적 관점(behavioral aspect)을 모두 포함한다. UML은 확장 가능한 언어로서, 특정 응용프로그램에 대한 새로운 스테레오타입(stereotype)의 사용이 가능하다. 데이터베이스 설계를 위한 확장된 UML의 스테레오타입이 제안되었지만, 대부분 관계형 데이터베이스에 초점이 맞추어져 있다. 본 논문에서는 객체 관계형 데이터베이스 설계를 위한 확장된 UML 스테레오타입을 기술하며, 복합관계 및 복합객체를 지원하기 위해 Aggregation, Composition, Association의 개념을 재정의한 설계기법을 제안하고, 제안한 설계기법을 지원하는 설계 도구(ORDesigner)의 구현에 대해서 기술한다.

• The Journal of the Korea Contents Association
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• v.16 no.1
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• pp.52-59
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• 2016

For almost of concrete structures by placing in cold weather, it is very important that the selection of curing method at early aged construction stage. The Exothermic curing method with hot wire and rapid hardening cement is used mostly to prevent the initial cracks and the strength decrease. Most of the construction sites, however, have not been applied to the optimal curing method caused by the simple approaches and the empirical judgements. Therefore, this paper has proposed a evaluation algorithm of the exothermic curing method for representing heating temperature, period, position of hot wire by analyzing the transient heat transfer solution. This has been implemented, moreover, using an object oriented programming language to develop structural analysis system taking account risk parameters. This system is composed of input module, database module, database store module, analysis module, and result generation module. Linkage interface between the central database and each of the related module is implemented by the visual c# concept. Graphic user interface and the relational database table are supported for user's convenience.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.5
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• pp.501-509
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• 2002

SGML(ISO 8879) has been proliferated to support various document styles and to transfer documents into different platforms. SGML documents have logical structure information in addition to contents. As SGML documents are widely used, there is an increasing need for database storage and retrieval system using the logical structure of documents. However. traditional search engines using document indexes cannot exploit the logical structure. In this Paper, we have developed an SGML document storage system, which is DTD-independent and store the document type and the document instance separately by using Grove which is the document model for DSSSL and HyTime. We have used the Object Store, an object-oriented DBMS, to store the structure information appropriately without any loss of structural information. Also, we have supported a index structure for search efficiency like the relational DBMS, and constructed an effective user interface which combines content-based search with structure-based search.

• The Transactions of the Korea Information Processing Society
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• v.6 no.2
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• pp.425-438
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• 1999

In recent days network computing technologies have bee developed rapidly and the extended use of Internet applications for enterprises such as internet/extarnet in and between enterprises has been increased enormously. Therefore the business in the future will be executed by virtual enterprise. Virtual enterprises which is based on information sharing between enterprises are composed of work processes related to information exchange between virtual enterprises, the team members who are representatives of the organizations that are participated in the actual business of virtual enterprises, and members who are representatives of the organizations that are participated in the actual business of virtual enterprises, and environment that are provided by supporting CALS(continuous Acquisition and Life cycle Support or commerce At light Speed). Supporting system of IDE(Integrated Data Environment)for CALS implementation that is provided as an environment of virtual enterprises has to ensure the autonomies of local data and to provide the accessibility of heterogeneous database of enterprises on network transparently for giving user a single global view of data. This paper introduce the design and implementation of the database broker system that can be accessed data transparently by the suers of participated enterprises in the integrated data environment supporting virtual enterprises. The system uses java/CORBA technology in Web environment and Object Query language (OQL) to process the queries of relational database system, object-oriented database system, and file information.