• Proceedings of the Korean Information Science Society Conference
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• 2006.06b
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• pp.211-213
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• 2006

시맨틱 웹과 에이전트 시스템을 위한 지식 기반(Knowledge Base)을 구축하기 위해 W3C의 RDF와 ISO의 토픽맵(Topic Maps)이 사용되고 있다. 이 두 표준은 표현력 상에서 중복되는 부분이 많음에도 불구하고 서로 다른 방면을 추구하였지만, 최근 W3C에서는 Task Force 팀을 구성하여 둘 사이의 상호운용성을 확보하려는 시도를 보이고 있다. 이에 따라 단순히 자원에 대한 메타 데이터를 구축하는 RDF에 semantic을 부여하는 RDF Vocabulary인 OWL과 토픽맵 간의 상호운용도 관심을 받기 시작하였다. 본 논문에서는 이러한 OWL과 토픽맵의 상호운용 가능성을 확인하기 위해 두 표준을 지원하는 각 저작 도구를 활용하여 표현력과 기능적 비교를 수행하고 이를 통하여 둘 사이에 어떠한 차이점이 있는가와 기능적인 극복을 위한 대안을 제시한다.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06c
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• pp.142-144
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• 2011

In a world in constant changes, more and more devices are producing data and it is indispensable to manage these data. That is why map reduce framework is a solution to manage a large amount of data in a fast and right way. In the other hand semantic web (RDF/OWL) is getting popular and can be a solution to manage data in an efficient way, so that such data can be retrieved and understood by both human and machine. In this paper we describes and analyze some projects that manages RDF with Map-Reduce framework.

• Journal of Korean Library and Information Science Society
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• v.36 no.3
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• pp.109-136
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• 2005

This paper describes the major components of ISO/IEC 11179 metadata registry (MDR) standard designed to promote data interoperability between systems, explains and discusses semantic web technology and Web ontology languages initiated by W3C that can be employed to further enhance data interoperability, and finally proposes a framework for a new RDF/OWL-based MDR to convert from the current human-readable MDR to machine-readable MDR. If the new MDR is successful, we might be able to offer a better customized information service to users. The future research will be concerned with evaluating objectively the effectiveness of machine-readable MDR in meeting the needs of real users.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.688-690
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• 2005

본 논문은 웹에 산재되어 있는 OWL/RDF(S) 도메인 온톨로지에 대한 검색 시스템을 설계하여, 온톨로지의 재사용성을 극대화 하는데 그 목적이 있다. 컴퓨터와 인간이 정보를 공유하고, 의미적인 상호작용을 위한 시맨틱 웹에 대한 연구가 활발이 진행되고 있다. 시맨틱 웹을 실현하기 위해 개념들의 정의와 개념들간의 관계를 형성하는 온톨로지의 구축이 필수요소가 됨에 따라 온톨로지를 구축하기 위해 OWL, RDF(S) 그리고 DAML+OIL 등의 많은 온롤로지 언어가 개발되었고, 이들 언어를 기반으로 하는 Protege, OILEd와 KAON 등의 사용자들에게 온톨로지 구축의 편리성을 제공하는 온톨로지 구축 도구들도 50여가지 이상 개발되었다. 이러한 이유로 많은 온톨로지들이 개발되고 있다. 그렇지만 온톨로지의 가장 큰 특징은 동일 도메인의 온톨로지의 재사용인데, 산재되어 있는 온톨로지들을 검색하기 어렵고, 이들을 한데 모아놓은 저장소 또한 갖추어지지 않아 동일한 도메인 온톨로지가 존재할지라도 새롭게 온톨로지를 구축해야한다. 이에 본 논문에서는 웹상에 존재하는 온톨로지들의 검색을 용이하게 하여 지식 정보의 재사용을 최대화하기 위하여 본 연구를 진행하고 시스템을 설계하였다.

• Journal of KIISE:Databases
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• v.41 no.4
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• pp.226-241
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• 2014

LOD(Linked Open Data) is composed of RDF triples which are based on ontologies. They are identified, linked, and accessed under the principles of linked data. Publications of LOD data sets lead to the extension of LOD cloud and ultimately progress to the web of data. However, if ontologically the same things in different LOD data sets are identified by different URIs, it is difficult to figure out their sameness and to provide trustworthy links among them. To solve this problem, we suggest a Trustworthiness Improving Link Evaluation, TILE for short, technique. TILE evaluates links in 4 steps. Step 1 is to consider the inference property of syntactic elements in LOD data set and then generate RDF triples which have existed implicitly. In Step 2, TILE appoints predicates, compares their objects in triples, and then evaluates links between the subjects in the triples. In Step 3, TILE evaluates the predicates' syntactic property at the standpoints of subject description and vocabulary definition and compensates the evaluation results of Step 2. The syntactic elements considered by TILE contain RDFS, OWL, OWL2 which are recommended by W3C. Finally, TILE makes the publisher of LOD data set review the evaluation results and then decide whether to re-evaluate or finalize the links. This leads the publishers' responsibility to be reflected in the trustworthiness of links among the data published.

• Journal of KIISE:Computing Practices and Letters
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• v.11 no.5
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• pp.451-457
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• 2005

In spite of the development of computers, the present state that a lot of electronic documents are overflowing makes it more difficult for us to get appropriate information. Therefore, it's more important to focus on getting meaningful information than processing the data quickly In this context, Semantic Web enables an intelligent processing by adding semantic metadata on yow web documents. Also, as the Semantic Web grows, the knowledge resources as well as web resources are getting more and more importance. In this paper, we propose an OWL storage system aiming at an intelligent Processing by adding semantic metadata on your web documents, plus a system aiming at an OWL-QL Query Processing.

• Journal of the Korea Society of Computer and Information
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• v.15 no.1
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• pp.31-42
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• 2010

GPM(Generic Product Model) developed by Hitachi in Japan is a common data model to integrate and share life cycle data of nuclear power plants. GPM consists of GPM core model, an abstract model, implementation language for the model and reference library written in the language. GPM core model has a feature that it can construct a semantic network model consisting of relationships among objects. Initial GPM developed and provided GPML as an implementation language to support the feature of the core model, but afterwards the GPML was replaced by GPM-XML based on XML to achieve data interoperability with heterogeneous applications accessing a GPM data model. However, data models written in GPM-XML are insufficient to be used as a semantic network model for lack of studies which support GPM-XML and enable the models to be used as a semantic network model. This paper proposes OWL as the implementation language for GPM core model because OWL can describe ontologies similar to semantic network models and has an abundant supply of technical standards and supporting tools. Also, OWL which can be expressed in terms of RDF/XML based on XML guarantees data interoperability. This paper uses OWL DL, one of three sublanguages of OWL, because it can guarantee complete reasoning and the maximum expressiveness at the same time. The contents of this paper introduce the way how to overcome the difference between GPM and OWL DL, and, base on this way, describe how to convert the reference library written in GPML into ontologies based on OWL DL written in RDF/XML.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.706-708
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• 2005

시맨틱 웹의 등장으로 시맨틱 검색에 대한 관심이 높아졌다. 이에 본 논문에서는 시맨틱 웹 환경의 자원들을 이용하여 시맨틱 검색을 수행하는 검색방법을 제안한다. 기존의 SPARQL(Simple Protocol and RDF Query Language) 시맨틱 질의언어는 추론의 기능 없이 RDF(Resource Description Framework)에서 제공하는 SPO(subiect, predicate, object) 형태의 트리플 패턴 매치만을 제공한다. 본 논문의 시스템은 기존의 SPARQL질의 시스템에 시맨틱 추론기능을 추가하여 검색 결과에 효율성을 증가 시키는 것을 목적으로 한다. 본 논문에서의 시스템은 다음과 같은 특징을 갖는다. 첫째, 시맨틱 웹 환경의 온톨로지 구축을 위해서 W3C에서 온톨로지 언어로 표준화된 OWL(Web Ontology Language)를 사용하여 검색 환경을 구축한다. 둘째, 온톨로지와 메타데이터를 추론하여 시맨틱 검색을 유도하는 OWL추론기를 사용한다. 시맨틱 추론은 온롤로지의 공리(Axiom)을 충분히 활용하는 온톨로지기반 시맨틱 추론과 검색 도메인에 맞는 규칙을 활용하는 사용자 컨텍스트 기반의 시맨틱 추론으로 이루어진다. 셋째, 다양한 시맨틱 검색을 위해 W3C에서 제안되어 차세대 시맨틱 검색 질의언어로 연구중인 SPARQL을 사용한다. 이와 같은 특징은 시맨틱 검색 시스템이 시맨틱 웹 환경의 자원을 충분히 활용하는 결과를 가져온다.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.23 no.2
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• pp.5-25
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• 2012

The purpose of this study is to develop linked data of authority data in national archives of Korea as a cornerstone for linked data cloud of Korea. The study analyzed data structure of authority data as well as a retrieval system. It finally developed linked data based on RDF/OWL, Dublin Core, and SKOS. The study also employed TopBraid ComposerTM as a tool for ontology construction. The visualization of the tool provides users with flexible search and browsing between data as well as access of detail authority data. It complements the search of a current system in terms of flexible linking between records and authority data. The study also suggests future work to publish linked data of archival data set itself and make rich relationships among data in museums, libraries, and other archives.

• Journal of the Korean Society for information Management
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• v.21 no.2
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• pp.249-267
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• 2004

Although MARC can define the detail cataloguing data, it has complex structures and frameworks to represent bibliographic information. On account of these idiosyncratic features of MARC, XML DTD or RDF/S that supports simple hierarchy of conceptual vocabularies cannot capture MARC formalism effectively. This study implements bibliographic ontology by means of abstracting conceptual relationships between bibliographic vocabularies of MARC. The bibliographic ontology is formalized with OWL that can represent the logical relations between conceptual elements and specify cardinality and property value restrictions. The bibliographic ontology in this study will provide metadata for cataloguing data and resolve compatibility problems between cataloguing systems. And it can also contribute the development of next generation bibliographic information system using semantic Web services.