• Proceedings of the Korean Information Science Society Conference
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• 2004.10b
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• pp.244-246
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• 2004

차세대 웹 환경을 위한 시맨틱 웹에 대한 관심이 날로 증대되고 있다. 이와 더불어 시맨틱 웹에서 자원의 의미적인 관계를 표현하기 위한 언어들에 대한 연구가 활발히 진행중이다. 특히 이러한 연구의 시작점으로 RDF, DAML+OIL 같은 여러 온톨로지 언어들이 등장하였지만 자원의 특성에 대한 기술이나 그들간의 관계에 대한 정의를 명확하게 표현하기에는 미흡한 점이 많다. 그러나 최근에 제안된 OWL은 RDF나 RDF 스키마를 확장하여 보다 의미 있는 자원의 관계를 정의할 수 있다. 본 논문에서는 OWL로 표현된 문서를 저장하기 위한 구조를 관계형 데이터베이스를 기반으로 제안한다. 본 논문에서 제안한 저장 구조는 기존의 RDF와 RDF 스키마를 위한 저장 구조를 확장하여, OWL을 통해 제공되는 클래스나 속성간의 동일성, 또는 이질성, 여러 클래스의 집합 관계 등의 추가적 기능을 지원하는데 목적을 두고 있다. 또한 제안한 저장구조를 이용한 OWL 문서의 질의 형태를 분석하고 이를 기존 RQL을 이용하여 표현하기 위해 OWL의 특성을 반영하도록 RQL을 확장했다.

• The Journal of the Korea Contents Association
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• v.5 no.6
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• pp.1-9
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• 2005

As the amount of data on the web increase, it is difficult to search what we want exactly. Therefore, much researches are attempted to search web resources efficiently. So, W3C established the standard that give meanings to resources on the web using RDF metadata. The RDF metadata had been mainly described a document data on the web. But it is difficult to create automatically the metadata for application programs than the document data. This paper proposes a method to use RDF metadata to search application programs. Firstly, we define RDF data model that stores the information of the application programs and RDF schema that references the RDF data model. And we design a prototype system to search application programs. This system meets expectation, getting the application to fullfill the needs of user, and has the efficiency of the searching function.

• Journal of Information Management
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• v.34 no.3
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• pp.87-109
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• 2003

Continual attempts to accumulate and apply information eventually gave birth to the concept of the "Semantic Web". Thus, the "Semantic Web" can be defined as a product of mankind's desire to standardize information. At the same time, the term provides "a method that standardizes mankind's concept of linguistical expression", and can be noted as an effort to combine such methods into a standard web environment that may materialize to form a catalogue. This study introduced RDF schema, ontology languages for the semantic web, and ontology-based systems. The purpose of the study was to construct a system based on the semantic web environment's ontology by utilizing the ontology schema derived from the facettype Art and Architecture Thesaurus(AAT). The aforementioned ontology schema is based on the Web Ontology Language(OWL), which is being widely considered the standard ontology language for the W3C-centered semantic web environment.

• 한국IT서비스학회:학술대회논문집
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• 2009.05a
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• pp.384-387
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• 2009

인터넷상에서 데이터 양은 빠른 속도로 증가하고 있으며, 더불어 RDF/XML 문서 크기 또한 상당히 크게 양산되고 있다. 이러한 상황은 효율적인 저장 모델을 요구하고 있으며, 저장된 데이터에 대해 효율적으로 질의를 처리할 수 있어야 한다. 이와 같은 많은 데이터를 저장하고 처리하기 위한 도구들이 존재하지만 이들 대부분은 과도한 조인연산, 데이터 및 스키마 관리에 있어서 문제점들을 안고 있다. 이에 본 연구에서는 문제점을 최소화하기 위해 Trie와 벡터(vector)를 사용하여 데이터를 저장할 수 있는 모델을 제안하며, 다음과 같은 내용을 중심으로 살펴본다. 먼저, 과도한 조인 연산을 피하며, 데이터를 지역화(localized) 및 캐쉬(cached)되게 저장한다. RDF 그래프를 상하로 이동하는 복잡도를 동일하게 하며, 스키마 정보와 데이터의 의미를 함께 저장하고 메모리 내(in-memory) 실행 문제 등을 해결한다. 이렇게 함으로서 의미 추출과 결과를 확대 시키는데 소요되는 시간을 최적화시킬 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1546-1549
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• 2008

유비쿼터스 시스템이 발전함으로 많은 사람들이 시스템을 사용함으로 인하여 정보보호에 대한 중요성이 증대되고 있다. 본 논문에서는 유비쿼터스 시스템에서 데이터를 표현하기 위하여 널리 사용되는 RDF/S가 정보보호에 대하여 취약함에 주목하고 RDF/S에 대한 정보보호를 위한 RDF/S 스키마와 추론에 필요한 규칙을 소개한다.

• The Journal of Society for e-Business Studies
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• v.9 no.3
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• pp.79-94
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• 2004

W3C has developed the RDF standard for utilizing ontology in Web applications. This paper presents extracting, storing, and applying ontology on product data. The management and document information included in DWG files is focused as an example. By analyzing the relationship among the drawing data, the RDF schema is designed frist. Based on the schema ontology is extracted and stored in XML files. As an application of the stored ontology, we the schema ontology is extracted and stored in XML files. As an application of the stored ontology, we can reconfigure the sitemap of drawing data repositories. In this example, the users can select the view that he or she is interested in (e.g., designer, document, project). With such various views of an drawing data repository, the users can access the specific data more effectively.

• Journal of KIISE:Databases
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• v.35 no.2
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• pp.132-142
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• 2008

In biological domain, there exist a variety of protein analysis databases which have their own meaning toward the same target of protein. If we integrate these scattered heterogeneous data efficiently, we can obtain useful information which otherwise cannot be found from each original source. Reflecting the characteristics of biological data, each data source has its own syntax and semantics. If we describe these data through RDF(S) models, one of the Semantic Web standards, we can achieve not only syntactic but also semantic integration. In this paper, we propose a new concept of integration layer based on the RDF unified schema. As a conceptual model, we construct a unified schema focusing on the protein information; as a representational model, we propose a technique for the wrappers to aggregate necessary information from the relevant sources and dynamically generate RDF instances. Two example queries show that our integration layer succeeds in processing the integrated requests from users and displaying the appropriate results.

• Journal of the Korea Computer Industry Society
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• v.7 no.3
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• pp.227-236
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• 2006

Semantic Web is getting popular to next web environment. Additionally, ontology language research is also activating to represent semantic relation of resource in semantic web. Specially, Ontology language as RDF and DAML+OIL appear on start point of research. But Ontology Language limited to describing characters of resource and to making a clear definition of relation of resource. So W3C suggest OWL at the next standard language for describing resource. OWL supply the lack of representation for RDF and RDF Schema. In this paper, we make Ontology to implement Online Retrieval System using OWL and propose the structure of storing Ontology document at the RDB. The structure support characters of OWL that are equivalent relationship, heterogeneous relationship, inverse relationship, union relationship and one of relationship between classes or properties. In this paper, we classify the extended elements for OWL from RDF Schema. And we propose the method of storing OWL using RDB for interoperability with many applications based on RDB. Finally, implement the storage and retrieval system based on OWL to provide advanced search function.

• 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.

• Journal of the Korean Society for information Management
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• v.18 no.4
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• pp.15-35
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• 2001

This paper suggests metadata as an effective search tool suitable for moving images on the web. Dublin Core, a leading metagata sceme of web resources, and MPEG-7, a coming international standard developed by MPEG, are used to construct a hybrid metadata scheme. RDF is selected as a framework for a matadata description and Moving Image Core was developed as a RDF schema. Finally, RDF/XML encoded metadata of moving images are retrieved throuth web-based database system using ASP technology.