• Journal of Korea Multimedia Society
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• v.7 no.10
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• pp.1354-1369
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• 2004

This paper presents a logical structure analysis method which transforms Web documents into XML ones. The proposed method consists of three phases: visual grouping, element identification, and logical grouping. To produce a logical structure more accurately, the proposed method defines a document model that is able to describe logical structure information of topic-specific document class. Since the proposed method is based on a visual structure from the visual grouping phase as well as a document model that describes logical structure information of a document type, it supports sophisticated structure analysis. Experimental results with HTML documents from the Web show that the method has performed logical structure analysis successfully compared with previous works. Particularly, the method generates XML documents as the result of structure analysis, so that it enhances the reusability of documents.

• Journal of Korea Multimedia Society
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• v.5 no.1
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• pp.105-113
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• 2002

XML documents, which are becoming new standard for expressing and exchanging data in the Internet, don't have defined schema. It is not adequate to directly apply XML documents to the existing SQL or OQL. Research on how to extract schema for XML documents and query language is going on actively. Fer users' query, the results could be too many or too less. It is important to give the users adequate results. This paper suggests the way to extract many levelized schema according to the frequency of element occurrence in XML documents. The Schema can be reduced or extended to correspond to the users'query more flexibly.

• Journal of Korea Multimedia Society
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• v.4 no.4
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• pp.287-296
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• 2001

This paper proposes an efficient algorithm to select the proper retrieval results from various information sources in Meta search. The algorithm collects and evaluates the related documents to the given query Then, it determines the appropriate retrieval results based on the relevance between the query and the collected documents. This algorithm depends on the Meta information such as the size N of population, top-ranked information of related documents and the precision in order to choose the most appropriate retrieval result.

• Journal of Korea Multimedia Society
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• v.1 no.2
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• pp.131-141
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• 1998

Video data occurred in multimedia documents consist of a large scale of irregular data including audio-visual, spatial-temporal, and semantic information. In general, it is difficult to grasp the exact meaning of such a video information because video data apparently consist of unmeaningful symbols and numerics. In order to relieve these difficulties, it is necessary to develop an integrated manager for complex structures of video data and provide users of video digital libraries with easy, systematic access mechanisms to video informations. This paper proposes a generic integrated video information model(GIVIM) based on an extended Dublin Core metadata system to effectively store and retrieve video documents in digital libraries. The GIVIM is an integrated mo이 of a video metadata model(VMN) and a video architecture information model(VAIM). We also present design and implementation results of a video document management system(VDMS) based on the GIVIM.

• Journal of Korea Multimedia Society
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• v.8 no.7
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• pp.869-881
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• 2005

XML(eXtensible Markup Language) has emerged as a prevalent standard for document representation and exchange on the Internet. XML documents contain information of different sensitivity degrees, so that XML Document must selectively shared by user communities. There is thus the need for models and mechanisms enabling the specification and enforcement of access control policies for XML documents. Mechanisms are also required enabling a secure and selective dissemination of documents to users, according to the authorizations which the users have. In this paper, we give an account of access control model and mechanisms, which XML documents can be securely protected in web environments. We make RBAC Based access Control polices to the problem of secure and selective access of XML documents. The proposed model and mechanism guarantee that the secure use for XML documents through definition of authority for element, attribute, link within XML document as well as XML document.

• The Transactions of the Korea Information Processing Society
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• v.7 no.2
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• pp.328-336
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• 2000

This paper presents a multimedia authoring system in which user can create multimedia documents more easily and dynamic presentations can be supported. Our system defines a new time relation based on causal relation, so it controls effectively presentations when durations of media are changed in run-time. It supports dynamic authoring to feedback the consistency that could be occurred when users authorize multimedia documents. In our system, a multimedia document is represented to internal structure using trees through parsing phases, and a presentation engine is provided for processing dynamic presentations and user interactions in run-time.

• Journal of Korea Multimedia Society
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• v.11 no.8
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• pp.1043-1050
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• 2008

XML has become a standard for data representation and exchange on the Internet. With a large number of XML documents on the Web, there is an increasing need to automatically process those structurally rich documents for information retrieval, document management, and data mining applications. In this paper, we propose a new method to measure the similarity between XML documents by considering their structures and contents. The similarity of document's structure is found by a simple string matching technique and that of document's contents is found by weights taking into account of the names and positions of elements. The overall algorithm runs in time that is linear in the combined size of the two documents involved in comparison evaluation.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.11a
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• pp.81-84
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• 2000

본 논문에서 제안하는 XMF(XML-based Mediation Framework)는 인터넷상의 이질적이고 분산되어 있는 정보 자원에 대하여 사용자에게는 위치 투명성(location transparency)과 접근 투명성(access transparency)을 보장하면서 통합시 발생하는 구조적 충돌(structural conflict)과 의미적 충돌(semantic conflict)을 해결하는 기능을 가지고 있다. 또한 XMF는 통합 모델로써 XML을 채택함으로써 모든 정보 자원에 대하여 모델링 할 수 있게 된다. 본 논문은 이러한 XMF를 기반으로 인터넷에 산재하는 정보 자원, 그리고 DBMS에 저장, 관리되는 데이터를 통합하여 사용자에게 가상 멀티미디어 문서(virtual multimedia document)를 제공하는 시스템을 구축하는 것이다.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.368-372
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• 2002

XML 문서의 구조를 파악하기 위하여 현재 많은 연구가 진행 되고 있으며, 대부분 XML 문서의 구조를 찾아 DTD나 스키마로 표현하는데 중점을 두고 있다. 본 논문에서는 XML 문서에서 구조를 추출하여 이를 UML 클래스 다이어그램으로 자동 변환하는 시스템을 제안한다. 제안된 시스템에서는 XML 문서로부터 요소-속성 트리를 구성하고, 이를 활용하여 문서 구조를 UML 클래스 다이어그램으로 쉽게 변환하도록 한다.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.11a
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• pp.363-366
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• 2003

이 논문에서는 XML 문서에 대한 경로질의를 효과적으로 처리할 수 있는 색인기법을 제안한다. 제안하는 색인 기법은 문서의 변경에 동적으로 대처하며 단순경로 질의뿐 아니라, 경로의 길이가 주어지지 않는 질의에도 효과적으로 동작한다. 이 논문에서는 제안하는 색인기법을 구현하고 실험을 통해서 경로질의를 처리하는 시간을 측정하여 제안하는 방법의 타당성을 보인다.