• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.43-45
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• 2003

인터넷을 통하여 원거리에 위치한 다수의 그룹들간의 협업을 지원하기 위하려 WebDAV 명세가 발표되었다. WebDAV는 HTTP/1.1의 확장에 사용되는 웹 통신 프로토콜로서, 인터넷을 통하여 광범위하고 다양한 콘텐츠의 비동기적인 협업을 지원하기 위한 표준 하부구조를 제공한다. 이러한 명세를 지원하는 클라이언트의 기능은 WebDAV 명세를 지원하는 서버의 자원을 HTTP 요청을 통하여 자원의 속성과 동시성의 문제를 해결하면서 자원의 저작을 지원하는 것이다. 본 논문에서는 기존의 WebDAV 클라이언트의 문제점을 개선하면서 유용성을 높이기 위하여 윈도우 기반의 탐색기 형태로 클라이언트를 개발하였다. 사용자의 수작업에 의한 문서 저작 절차를 단순화하고 저작 응용프로그램의 모니터링을 통하여 문서 변경에 대한 능동적인 서버 갱신을 지원하고 있다. 또한 마이크로소프트의 닷넷 기반구조를 지원하는 운영체제하에서 본 응용 프로그램이 구동될 수 있는 장점이 있다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.569-572
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• 2004

The Web site which many people manage and maintenance much HTML page is so difficult to solve broken link like as dangling reference and inaccurate contents reference. That is, in the case we update or delete connections structure between HTML documents, it is difficult to guarantee referential integrity of Web Pages. In this chapter, we surveyed and defined integrity constraints condition between the parent page and child page, and studied about method to express by extension UML. WWW, Constraints, UML

• Proceedings of the Korean Information Science Society Conference
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• 2001.10b
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• pp.574-576
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• 2001

인터넷의 발달과 함께 많은 부분에서 이를 응용하려는 노력이 지속되고 있다. 이에 학사행정업무에서도 이를 응용하여, 원거리의 학생에 관한 학교업무에 편리성과 효율성을 주고 있다. 본 논문에서는 전체 학사행정업무 중에서 성적조회와 수강신청 및 변경에 관한 업무를 온라인 상에서 할 수 있도록 하는 학사지원시스템을 설계 및 구현하였다. 이는, 크게 학생모드와 관리자 모드로 나누었으며, 학생모드에서는 성적조회와 수강신청을 하도록 하고 관리자모드에서는 수강기간을 입력 및 변경할 수 있도록 하였다. 이를 위하여, 본 시스템분석에서는 UML을 이용하였고, 시스템 개발에서는 ASP를 이용하였으며 데이터베이스는 MS-ACCESS를 이용하였다. 또한, 웹 문서의 효율적인 활용을 위하여 Java Script 언어를 사용하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.521-524
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• 2001

학사행정 업무분야는 학교업무의 전산화에 있어서 가장 중요한 요소가 되며, 이를 인터넷에 접목하여 사용하면서 최대의 효과를 부가시키고있다. 즉, 인터넷을 응용하여 원거리의 학생에 관한 학교업무에 편리성과 효율성을 주고 있다. 이에, 본 논문에서는 전체 학사행정업무 중에서 성적조회와 수강신청 및 변경에 관한 업무를 온라인 상에서 할 수 있도록 하는 학사지원시스템을 선계 및 구현하였다. 이는, 학생모드와 관리자 모드로 나누었으며, 학생모드에서는 성적조회와 수강신청을 수행하고 관리자모드에서는 수강기간 입력 및 변경업무를 수행 할 수 있도록 하였다. 이를 위하여, 본 논문의 시스템분석에서는 UML을 이용하여 Use Case Diagram, Sequence Diagram등을 작성하였다. 이를 통하여, 시스템 개발에서는 ASP를 이용하여 구현하였으며, 데이터베이스는 MS-ACCESS를 이용하였다. 또한, 웹 문서의 효율적인 활용을 위하여 부분적으로 Java Script 언어를 사용하였다.

• Journal of KIISE:Databases
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• v.32 no.6
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• pp.628-640
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• 2005

The XML is well accepted in several different Web application areas. As soon as many users and applications work concurrently on the same collection of XML documents, isolating accesses and modifications of different transactions becomes an important issue. When an XML document correctly corresponds to the rules laid out in a DTD or XML schema, it is also said to be valid. The valid XML document's validity should be guaranteed after the document is updated. The validation method mentioned above, however, results in lower degree of concurrency. For getting higher degree of concurrency and minimizing the range of the XML document validity, a new validation method based on a specific locking method is required. In this paper we propose the sequence group validation method for minimizing the range of the XML document validity. We also propose the boundary locking method for isolating accesses and modifications of different transactions while supporting the valid XML document's validity. Finally, the results of some experiments show the validation and locking methods increase the degree of transaction concurrency.

• The KIPS Transactions:PartD
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• v.10D no.3
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• pp.387-398
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• 2003

Materialized views have received much attention for query performance improvement. They need to be refreshed whenever their underlying data sources are updated. They could be recomputed from scratch or they could be incrementally refreshed by reflecting only those portions of updates that affect them. With emergence of XML as the standard for data exchange on the Web, active research is under way on effectively storing and retrieving XML documents. In this paper, we describe a performance study on the incremental refresh of XML materialized views for the case where XML documents are stored in a relational DBMS, and XML materialized views are maintained with incremental refresh. We describe implementation of a prototype XML storage system that supports XML materialized views and their incremental refresh, and report the performance results obtained with the implemented system through a detailed set of experiments on the incremental refresh of XML materialized views. The results show that the XML view maintenance with incremental refresh outperforms the ordinary view recomputation.

• Journal of KIISE:Computing Practices and Letters
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• v.16 no.9
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• pp.918-926
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• 2010

A widget is a small application running by the users' favorite services, so they are provided with web contents without explicitly visiting the web site. Although widgets can be easily implemented with Open APIs, only a few web sites provide them because of refactoring the structures of web resource to supply Open APIs to the widget developers. This paper presents an Open API Proxy Server System for widget services. The system consists of two components: an Open API Source Code Generator and an Open API Proxy Server. The Open API Source Code Generator provides a Graphical User Interface (GUI) for users to generate the Open APIs of user's choice and sends the Open API source code generation request to the Open API Proxy Server. The Open API Proxy Server using the HTML Table Processing Library receives the HTML web page from web site and extracts useful information from the target HTML table. The proxy server converts the extracted data into the corresponding XML document which becomes available through the Open API. We verify the operation of the proposed system through experiments with the HTML tables in the example web sites.

• The KIPS Transactions:PartB
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• v.9B no.6
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• pp.845-852
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• 2002

Electronic document processing using EDl (Electronic Data Interchange) must exchange documents using VAN (Value Added Network). However. the use of exclusive software needs alteration of a new document and the use of VAN(Value Added Network) demands an exchange of document and high cost for maintenance. Due to these problems, the existing EDI (Electronic Data Interchange) is turning into Web-based EDI (Electronic Data Interchange). This paper suggests techniques that change EDI (Electronic Data Interchange) messages which exist in two relational databases into XML (extensible Markeup Language) using the JDBC bridge. Also this paper proposes a method that recovers schema using converted XML (extensible Markeup Language) file, and a method which inserts an original record into a declared table. This solves the limitation of an original method that have to use sane database management system and also overcomes the problem in certain circumstances where the EDI (Electronic Data Interchange) exchange does not work.

• Journal of KIISE:Software and Applications
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• v.31 no.3
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• pp.255-266
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• 2004

In the Web-based information systems, separating the business process logic from the data and presentation logic brings about a wide range of advantages. However, this separation is not easily achieved; even the data logic may be not separated from the presentation layer. So, it requires to define an model for business processes, and then to map the model into the user's dynamic interface using the logic separating strategy. This paper presents a stylesheet method to recognize the process by extending XSLT (Extensible Stylesheet Language Transformations), in order to achieve the logic separation. To do this, it provides an specification of the business process, and a scheme that extracts business model factors and their interactions using a Petri-net notation to show the business model into the process point of view. This is an attempt to separate users' interaction from the business process, that is, dynamic components of interaction Web document from the process structure of Web applications. Our architecture consist mainly of an XSLT controller that is extended by a process control component. The XSLT controller is responsible for receiving the user requests and searching the relevant templet rule related to different user requests one by one. Separation of concerns facilities the development of service-oriented Web sites by making if modular. As a result, the development of service-oriented Web sites would be very easy, and can be changed without affecting the other modules, by virtue of the modularization concept. So, it is easy to develop and maintain the Web applications in independent manner.

• The KIPS Transactions:PartB
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• v.11B no.1
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• pp.91-98
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• 2004

This paper proposes how to support various media on online conversational activity using XML(extensible Markup Language). The method converts media information into XML based messages and handles alike conventional text based messages. The XML based messages are unified to an XML document, and then a HTML document is generated using the XML and an XSLT documents in a server. A user in each client can play or present media through the hyperlink that is associated media information on the HTML document. The suggested method supports use of various media (text, image, audio, video, documents, etc) and efficient maintenance of font size, color, and style on messages according to extension and modification of XML tags. For application, this paper implemented the system to support media that has client and server architecture on online conversational activity. A user in each client inputs text or media based message using JAVA applet and servlet on the system, and conversational messages on every users' interfaces are automatically updated whenever a user inputs new message. Media on conversational messages are played or presented according to a user's click on hyperlink. Applications for the media presentation are as follows : distance learning, online game, collaboration, etc.