• Title/Summary/Keyword: RDF/OWL

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Class-Visualization based OWL Ontology Editor (클래스 시각화를 통한 OWL 온톨로지 편집기 개발)

  • 김민수;송세헌;서재우;김민구
    • Proceedings of the Korean Information Science Society Conference
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    • 2004.10a
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    • pp.109-111
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    • 2004
  • 시맨틱웹의 실용화에 대한 연구가 활기를 띠면서 국내에서도 시맨틱웹에 관한 연구와 그 기반이 되는 온톨로지에 대한 관심이 높아지고 있다. RDF, DAML+OIL 등 많은 온톨로지 언어가 개발되었고 W3C는 2004년 2월 OWL(Web Ontology Language)을 온톨로지를 위한 표준 언어로 발표했다. 이와 함께 프로티지 등 온톨로지 개발을 위한 편짐 도구들에 관한 연구도 진행되고 있다 본 논문에서는 기존 편집기의 문제를 지적하고 새로운 편집 방법을 통한 온톨로지 편집기를 개발하였다. 이 편집기는 가장 널리 사용되고 있는 온톨로지 개발도구인 프로티지와 그 위에서 작동하는 OWL plug-in을 기반으로 한다.

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Design and Implementation of a Graphical Bio-Ontology Management System based on OWL (OWL 기반 그래픽 바이오 온톨로지 관리 시스템의 설계 및 구현)

  • Kim Ki-Heon;Choi Jae-Hun;Yang Jae-Dong;Park Cheon-Shu
    • Journal of KIISE:Software and Applications
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    • v.32 no.6
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    • pp.461-472
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    • 2005
  • In this paper, we design and implement a graphical bio-ontology management system based on OWL(Web Ontology Language). It allows domain experts to easily manage sophisticated bio-ontologies in which biological knowledge is encoded. The knowledge can be seamlessly modeled into the ontology by well defined graphical notations, which capture most of subtle semantics inherently existing between biological terms. Our system provides a new construction mechanism, which can determine a considerable part of relationships between terms by their inheritance and inverse-inheritance. For keeping their semantics to be consistent, the mechanism supplies domain experts with information available from relationships being constructed or already constructed. The constructed ontology is basically formatted by OWL, which may benefit from its powerful semantic expressiveness. Additionally, it can be automatically translated into other standard languages without semantic loss, such as RDF/RDFS, DAML+OIL and so on. The main characteristics of our system is that it enables domain experts to delicately model the bio-ontology by the visualized construction mechanisms adopting well-defined graphical notations based on OWL.

Analysis of Access Authorization Conflict for Partial Information Hiding of RDF Web Document (RDF 웹 문서의 부분적인 정보 은닉과 관련한 접근 권한 충돌 문제의 분석)

  • Kim, Jae-Hoon;Park, Seog
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.18 no.2
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    • pp.49-63
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    • 2008
  • RDF is the base ontology model which is used in Semantic Web defined by W3C. OWL expands the RDF base model by providing various vocabularies for defining much more ontology relationships. Recently Jain and Farkas have suggested an RDF access control model based on RDF triple. Their research point is to introduce an authorization conflict problem by RDF inference which must be considered in RDF ontology data. Due to the problem, we cannot adopt XML access control model for RDF, although RDF is represented by XML. However, Jain and Farkas did not define the authorization propagation over the RDF upper/lower ontology concepts when an RDF authorization is specified. The reason why the authorization specification should be defined clearly is that finally, the authorizatin conflict is the problem between the authorization propagation in specifying an authorization and the authorization propagation in inferencing authorizations. In this article, first we define an RDF access authorization specification based on RDF triple in detail. Next, based on the definition, we analyze the authoriztion conflict problem by RDF inference in detail. Next, we briefly introduce a method which can quickly find an authorization conflict by using graph labeling techniques. This method is especially related with the subsumption relationship based inference. Finally, we present a comparison analysis with Jain and Farkas' study, and some experimental results showing the efficiency of the suggested conflict detection method.

The Interoperability between RDF/OWL and Topic Maps using the Semantic Wiki (시맨틱 위키를 이용한 RDF/OWL과 토픽맵 사이의 상호운용성)

  • Kim, Hoon-Min;Yang, Jung-Jin
    • The Journal of Society for e-Business Studies
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    • v.12 no.1
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    • pp.123-133
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    • 2007
  • With the emergence of Semantic Web and Web 2.0, the paradigm shift of the Web is on resource-centered services. That is, the focus now moves from having just rich resources to the meta-information of describing the resources. The relevant standards, RDF(Resource Description Language) and Topic Maps, of describing the meta-information are defined and adopted by W3C and ISO respectively. Describing meta-information in such a XML form could be burdensome to participants. Semantic Wiki extended from 1)WikiWikiWeb is proposed to deal with the problem. It enables users to generate RDF meta-information about Wiki pages with simple usages of the grammar. We discuss the way of improving interoperability between Topic Maps-based semantic Wiki papges and RDF-based ones. The method proposed by RDFTM task force is present with the usage of high-level Wiki grammar for facilitating low-level transformation.

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The SemanticWeb Technology and its Applications (시맨틱웹 기술과 활용방안)

  • 오삼균
    • Journal of the Korean Society for information Management
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    • v.19 no.4
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    • pp.298-319
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    • 2002
  • The Semantic Web is a new technology that attempts to achieve effective retrieval, automation, integration, and reuse of web resources by constructing knowledge bases that are composed of machine-readable definitions and associations of resources that express the relationships among them. To have this kind of Semantic Web in place, it is necessary to have the following infrastructures: capability to assign unchangeable and unique identifier (URI) to each resource, adoption of XML namespace concept to prevent collision of element and attribute names defined by various institutions, widespread use of RDF to describe resources so that diverse metadata can be interoperable, use of RDF schema to define the meaning of metadata elements and the relationships among them, adoption of DAML+OIL that is built upon RDF(S) to increase reasoning capability and expressive power, and finally adoption of OWL that is built upon DAML+OIL by removing unnecessary constructors and adding new ones based on experience of using DAML+OIL. The purpose of this study is to describe the central concepts and technologies related to the Semantic Web and to discuss the benefits of metadata interoperability based on XML/RDF schemas and the potential applications of diverse ontologies.

A Study of Dynamic Web Ontology for Comparison-shopping Agent based on Semantic Web (시멘틱 웹 기반의 비교구매 에이전트를 위한 동적 웹 온톨로지에 대한 연구)

  • Kim, Su-Kyoung;Ahn, Ki-Hong
    • Journal of Intelligence and Information Systems
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    • v.11 no.2
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    • pp.31-45
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    • 2005
  • In this paper, convert in RDF triple and a RDF document through RDF document converters and design metadata schema about a digital camcorder after use Wrapper technology, and acquiring commodity information of a HTML page about the digital camcorder which these papers are defined so as to be different by electronic commerce stores, and is expressed. Save in digital camcorder domain ontology storage that implemented to relational database to DCC knowledge base ontology as convert to OWL Web ontology based on designed metadata schema. Through compare with rdf and DCCKBO, mapping, and inference process, provide to buyers by DCC information of the store that had the commodity purchasing information which is the best, and proposed a dynamic Web ontology guessed to contents of the best commodity purchasing information, and to define domain ontology saved in DCCKBO.

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The Modification of UML for Developing of the Efficient Ontology (효율적인 온톨로지 개발을 위한 UML의 변경)

  • Kim, Young-Tae;Lim, Jae-Hyun;Kim, Chi-Su
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.2
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    • pp.415-421
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    • 2008
  • The increasing interest in ontologies is driven by the large volumes of information now available as well as by the increasing complexity and diversity of this information. These trends have also increased interest in automating many activities that were traditionally performed manually. We are currently engaged in this paper that have realized benefits in productivity and clarity by utilizing UML class diagrams to develop and to display complex OWL ontologies. UML has many features, such as profiles, global modularity and extension mechanisms that are not generally available in most ontology languages. However, ontology languages have some features that UML does not support. Our paper identifies the similarities and differences between UML and the ontology languages RDF and OWL. To reconcile these differences, we propose a modification to the UML metamodel to address some of the most problematic differences.

Design and Implementation of Web Ontology Inference System Using Axiomatisation (어휘의 공리화를 이용한 Web Ontology 추론 시스템의 설계 및 구현)

  • 하영국;손주찬;함호상
    • Proceedings of the Korean Information Science Society Conference
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    • 2003.10c
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    • pp.559-561
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    • 2003
  • 최근 차세대 Web 기술로서 Semantic Web이 주목 받고 있다. Semantic Web에서는 Web상에 존재하는 문서에 Web Resource들에 대한 Ontology를 기반으로 Semantic Annotation을 하고 Ontology 추론 Agent를 통하여 의미 기반으로 Web을 검색할 수 있도록 해준다. 이와 같은 Semantic Web 기술의 핵심 요소는 Web Ontology이며 W3C에서는 이를 표현 할 수 있는 표준 언어로서 RDF기반의 OWL(Web Ontology Language) 명세를 제정하고 있다. 따라서 표준 Web Ontology 언어인 OWL을 위한 추론 시스템은 Semantic Web 검색 Agent의 구현을 위한 필수적인 기반 기술이라 할 수 있으나 아직 그 개발이 미비한 상태이다. OWL 추론 시스템을 구현하기 위해서는 OWL의 이론적인 기반을 제공하는 DL(Description Logic)을 추론할 수 있는 엔진을 사용하는 것이 한가지 방법이 될 수 있으나 OWL이 Rule과 같은 DL의 범주를 벗어나는 Vocabulary를 지원하는 언어로 확장되는 경우에 이를 처리하기가 어렵다. 또 다른 방법으로서 Logic Programming을 통하여 OWL 언어의 Semantic을 기술하고 정리 증명(Theorem Proving)을 통하여 Ontology를 추론하는 공리화(Axiomatisation) 기법이 있는데 이러한 방법의 장점은 기반이 되는 Logic의 범주 내에서 새로운 언어를 위한 Vocabulary의 확장이 용이하다는 점이다. 본 논문에서는 Axiomatisation 방법을 이용하여 OWL로 기술된 Ontology를 추론할 수 있는 시스템의 설계 및 구현에 대해 설명하기로 한다.

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SPARQL Query Tool for Web-based OWL Ontology Access (웹 기반 OWL 온톨로지 접근을 위한 SPARQL 쿼리 툴)

  • Daewoong Jo;Jeewoong Choe;Myungho Kim
    • Proceedings of the Korea Information Processing Society Conference
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    • 2008.11a
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    • pp.56-59
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    • 2008
  • 지금까지의 웹은 표현중심의 HTML에서 데이터의 구조적인 모습을 나타내는 XML로 그리고, 온톨로지 구축을 통해 의미 있는 데이터의 접근성에 초점을 둔 RDF, RDFS, OWL과 같은 형태로 변화하고 있다. 이러한 흐름을 통해 현재는 OWL을 이용하여 온톨로지 구축을 위한 연구가 진행 중이다. 이 논문에서는 구축된 온톨로지를 활용하기 위해 웹에 있는 OWL 파일을 http 프로토콜을 이용하여 접근을 하고 기존의 툴 종속적인 접근이 아닌 웹 표준 프로토콜과 OWL 파일 형식으로 접근하여 SPARQL 쿼리를 보낼 수 있는 웹 기반의 OWL 온톨로지 접근을 위한 SPARQL 쿼리 툴을 제안한다.

SPARQL Query Tool for Using OWL Ontology (OWL 온톨로지 사용을 위한 SPARQL 쿼리 툴)

  • Jo, Dae-Woong;Choi, Ji-Woong;Kim, Myung-Ho
    • Journal of the Korea Society of Computer and Information
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    • v.14 no.11
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    • pp.21-30
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    • 2009
  • Semantic web uses ontology languages such as RDF, RDFS, and OWL to define the metadata on the web. There have been many researching efforts in the semantic web technologies based on an agent for extracting triple and relation about concept of ontology. But the extraction of relation and triple about the concept of ontology based on an agent ends up writing a limited query statement as characteristics of an agent. As for this, there is the less of flexibility when extracting triple and relation about the other concept of ontology. We are need a query tool for flexible information retrieval of ontology that is can access the standard ontology and can be used standard query language. In this paper, we propose a SPARQL query tool that is can access the OWL ontology via HTTP protocol and it can be used to make a query. Query result can be output to the soap message. These operations can be support the web service.