• 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.

• Journal of Satellite, Information and Communications
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• v.7 no.3
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• pp.86-93
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• 2012

In this paper, we propose keyword search and ranking methods for OWL documents that describe metadata and ontology on the Semantic Web. The proposed keyword search method defines a unit of keyword search result as an information resource and expands a scope of query keyword to names of class and property or literal data. And we reflected derived information by inference in the keyword search by considering the elements of OWL documents such as hierarchical relationship of classes or properties and equal relationship of classes. In addition, our method can search a large number of information resources that are relevant to query keywords because of information resources indirectly associated with query keywords through semantic relationship. Our ranking method can improve user's search satisfaction because of involving a variety of factors in the ranking by considering the characteristics of OWL. The proposed methods can be used to retrieve digital contents, such as broadcast programs.

• 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.

• The KIPS Transactions:PartD
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• v.15D no.4
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• pp.569-580
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• 2008

Web services are the current most promising technology for service oriented architecture(SOA) implementations. However, in spite of the large scale acceptance of web services, they have been relegated to internal integration projects, and the grand vision of virtual enterprises where partners can be integrated on demand is yet to be realized. The main reason is that the current standards of web services are not very suitable for the dynamic web service discovery and integration. In this paper, we present a novel SemanticBPEL solution that merges the benefit of WS-BPEL, with the advantage of OWL-S for building a semi-automatic web service composition system. In particular, this work proposes a multi-phase search method for solving dynamic discovery and integration problems of web services. The proposed method is compared with the existing keyword based retrieval method. These comparisons show that our approach outperforms the existing method.

• International Journal of Railway
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• v.4 no.4
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• pp.109-115
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• 2011

An analysis and design method for reducing aerodynamic noise in high-speed trains based on biomimetics of noiseless flight of owl is proposed. Five factors related to the morphology of the flight feather have been selected, and the candidate optimal shape of the flight feather is determined. The turbulent flow field analysis demonstrates that the optimal shape leads to diminished vortex formation by causing separation of the flow as well as allowing the fluid to climb up along the surface of the flight feather. To determine the effect of scaling of the owl's flight feather on the noise reduction, a two-fold and a four-fold scaled up model of the feather are constructed, and the numerical simulations are carried out to obtain the aerodynamic noise levels for each scale. Original model is found to reduce the noise level by 10 dBA, while two-fold increase in length dimensions reduces the noise by 12 dBA. Validation of numerical solution using wind tunnel experimental measurements is presented as well.

• Journal of KIISE:Software and Applications
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• v.35 no.6
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• pp.366-373
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• 2008

The web ontology language(OWL) has been used by ontology designers to construct ontology. In order to derive hidden information(concept subsumption, concept satisfiability and realization) of OWL ontology, a number of OWL reasoners have been introduced. But most reasoners simply report these information without process for any arbitrary entailment and unsatisfiable concept derived from a OWL ontologies. In this paper, we propose Minimum Expression Axiom Set(MEXS) detection and storing for debugging unsatisfiable concepts in ontology. In order to detect MEXS, we need to find axiom to cause inconsistency in ontology. Therefore, our work focused on two key aspects: given a inconsistency ontology, identifying the roots of axioms to occur unsatisfiable and derived axioms from among them; and extracting MEXS. Our results can be applicable to all application, which is at the basis of the description logic.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.7
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• pp.718-722
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• 2008

Ontology plays an important role of the Semantic Web to describe meaning and reasoning of resources. Ontology has more rich expressive power through OWL that is a next standard representation language recommended by W3C. As the Semantic Web is widely known, an amount of information resources on the Web is growing rapidly and the related information resources are placed in distributed systems on the Web. So, for providing seamless services without the awareness of far distance, efficient management of the distributed information resources is required. Especially, sear ching fast for local repositories that include data related to user's queries is important to the performance of systems in the distributed environment. In this paper, first, we propose an index structure to search local repositories related to queries in the distributed Semantic Web. Second, we propose a query rewriting strategy to extend given user's query using various expression of OWL. Through the proposed index and query strategy, we can utilize various expressions of OWL and find local repositories related to all query patterns on the Semantic Web.

• Journal of Korea Society of Digital Industry and Information Management
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• v.9 no.1
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• pp.59-72
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• 2013

In this paper, we propose a keyword query processing technique based on semantic relationships for OWL data. The proposed keyword query processing technique can improve user's search satisfaction by performing two types of associative search. The first associative search uses information inferred by the relationships between classes or properties during keyword query processing. And it supports to search all information resources that are either directly or indirectly related with query keywords by semantic relationships between information resources. The second associative search returns not only information resources related with query keywords but also values of properties of them. We design a storage schema and index structures to support the proposed technique. And we propose evaluation functions to rank retrieved information resources according to three criteria. Finally, we evaluate the validity and accuracy of the proposed technique through experiments. The proposed technique can be utilized in a variety of fields, such as paper retrieval and multimedia retrieval.

• Journal of the Korea Society of Computer and Information
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• v.14 no.2
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• pp.169-180
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• 2009

The conventional paper retrieval is the keyword-based search and as a huge amount of data be published, this search becomes more difficult in retrieving information that user want to find. In order to search for information to the user's intent, we need to introduce semantic Web that represents semantics of Web document resources on the Internet environment as ontology and enables the computer to understand this ontology. Therefore, we describe a paper retrieval system through OWL(Ontology Web Language) ontology-based reason in this paper. We build the paper ontology based on OWL which is new popular ontology language for semantic Web and represent the correlation among diverse paper properties as the DL(description logic) query, and then this system infers the correct results from the paper ontology by using the DL query and makes it possible to retrieve information intelligently. Finally, we compared our experimental result with the conventional retrieval.

• Annual Conference of KIPS
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• 2005.05a
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• pp.465-468
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• 2005

본 논문에서는 OWL-S 서비스 온톨로지를 자동으로 생성하는 방법에 대한 연구결과를 제공한다. 자동생성을 위하여 UML 클래스 다이어그램 및 상태차트 다이어그램을 XMI 파일들로 변환한 후 원자 서비스 및 속성들에 대한 정보와 복합 서비스 조합에 대한 정보를 각각 추출한다. 추출된 정보는 UML 상태차트 다이어그램 구성 요소들과 OWL-S 복합 서비스를 위한 구조물들 사이의 매핑 규칙들을 통하여 XSLT 응용에서 OWL-S 서비스 모델 온톨로지를 자동으로 생성시키는데 사용된다. 생성된 온톨로지의 타당성 검증을 위해서 이용 가능한 여럿의 유효성 검사를 수행하였다. 우리의 방법론은 자동적, 효과적 및 일반적일 뿐만 아니라 서비스 온톨로지 생성자인 개발자들에게 매우 친숙한 환경에서 수행된다는 장점들을 가진다.