• Journal of Information Technology Services
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• v.7 no.4
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• pp.87-99
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• 2008

As the technologies for telecommunication have been evolving, more enhanced information services and integrated information systems have been introduced, which can manage a variety of information from the heterogeneous systems. The major obstacle for the integrated information systems is the integrating heterogeneous databases in the systems and the heterogeneity problems can be classified into the structural and data heterogeneities. However, the previous researches have mainly highlighted into the solving structural heterogeneity problems. This paper identifies the data heterogeneity problems for multi-database schema integrations and proposes a new solving method. We analyze the semantics equivalence in data values based on the functional dependency, primary and candidate keys, and present a procedural solution of data heterogeneity in the perspective of the concept of attribute equivalence, integration key and conceptual integration table.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.244-246
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• 2006

최근 들어서 생물학, 건설, 토목, 의학, 화학, 항공 등 다양한 과학 분야에서 효율적인 공동 연구를 돕기 위해서 그리드 기반 데이터 통합을 위한 많은 연구가 진행되고 있다. 하지만 각 분야에서 사용하는 이질적인 형식의 데이터를 원활히 통합하는 것은 매우 어려운 문제이다. 이러한 측면에서, XML은 이질적인 시스템 간 데이터 공유의 수단으로서 광범위하게 사용되고 있으나, 데이터를 의미적으로 통합하는데 에는 한계가 있다. 이 문제를 해결하기 위해서, 본 논문에서는 그리드 환경에서 XML Schema 에 기반을 둔 이질적인 데이터 소스들을 의미적으로 통합하고 검색하는 방법으로서 RDF/RDFS 기반의 온톨리지 매핑을 통한 통합 검색 방안을 제안한다. 우리가 제안하는 방법은 특히 데이터를 XML Schema를 이용해서 표현하기 때문에 원래 데이터소스에 대한 수정 없이도, XML Schema 기반의 구조적 검색뿐 아니라, 온톨로지 기반의 의미적인 데이터 통합 및 검색을 가능하게 한다. 우리는 이 방법을 토목 분야의 시스템에 적용하여 검증하였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.1
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• pp.93-101
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• 2010

Currently lots of studies to solve meta-data interoperability in between schema attributes are conducted. But the accuracy in previous schema mapping studies is low since the studies just use the similarity in between attributes. So the studies are not suitable for the schema mapping such as document conversion, system integration, etc. In this paper, we propose a method which can conduct the schema mapping interactively using frequent pattern mining. The method can conduct more accurate mapping process because the method use the description element which is an element among each schema element for the metadata standard. A performance study has been conducted to compare the accuracy performance of the method using metadata standards.

• The KIPS Transactions:PartD
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• v.11D no.3
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• pp.519-532
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• 2004

With the explosion of bioinformatics data such proteins and genes, biologists need a integrated system to analyze and organize large datasets that interact with heterogeneous types of biological data. In this paper, we propose a integration system based on a mediated data warehouse architecture using a XML model in order to combine protein related data at biology laboratories. A fact constellation model in this system is used at a common model for integration and an integrated schema it translated to a XML schema. In addition, to track source changes and provenance of data in an integrated database employ incremental update and management of sequence version. This paper shows modeling of integration for protein structures, sequences and classification of structures using the proposed system.

• Proceedings of the SAREK Conference
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• 2005.11a
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• pp.526-532
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• 2005

Representation of product data for exchanging and sharing a plant information was established the International Standard by ISO 10303 (STEP) and ISO 15926, but is not used widely in industrial circles by massiveness of standard and complexity of plant itself Specially, they are embodied to STEP data file(ISO 10303 Parts 21), but STEP file is uncomfortable that a person recognizes, and needs specification creation tool. In this paper, we made the integration schema for control valve through related standards, Also, we suggest the practical use framework for electronic commerce to utilize the XML schema that can represents integrate schema of control valve to use XML that is becoming the latest issue.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.184-186
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• 2002

웹을 통해 얻을 수 있는 데이터의 양이 방대해 지면서, 이질적이고 분산된 웹 상의 데이터들을 통합하여 이용하려는 요구가 커지고 있다. 데이터의 통합은, 각 데이터의 스키마를 통합하여 단일화된 스키마를 만들고 통합된 스키마에 질의를 하여 원하는 결과를 얻는 것으로 이를 수 있다. 이러한 스키마 통합의 필요성은 인터넷 환경이 보편화되고 정보의 양이 방대해 지면서 웹 데이터를 대상으로 하여 더욱 커지게 되었다. 본 논문에서는 XML의 새로운 스키마 언어인 XML Schema를 이용한 스키마 통합시에 발생하는 스키마 충돌의 포괄적인 분류와, 이때 발생하는 충돌을 해결하고 통합 스키마를 작성하기 위한 기법을 제안한다.

• The KIPS Transactions:PartD
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• v.10D no.3
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• pp.367-374
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• 2003

A mediator-wrapper system, which is one of integration methods of heterogeneous databases, preserves a virtual integrated view rather than physical movement of the contents of each database. In order for a mediator to preserve a virtual integrated view, it requires the schema manager of the wrapper which communicates with local databases. This paper presents a schema manager of a wrapper that provides a mediator with XML schema which is generated from relational database schema. The XML schema manager supports a user-defined XML view. We present the view tree model which is used for materializing the use-defined XML view to generate XML schema, and the conversion algorithm based on the proposed view tree model. This model is can be uniformly applied to all schema managers of heterogeneous information sources.

• Journal of the Korea Society of Computer and Information
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• v.12 no.1 s.45
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• pp.9-15
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• 2007

As the information of the internet increased, importance of sematic web for collecting and integration of these informations to support decision making of some group or ordinary people are growing as well. Basis structure that composes semantic web is ontology and languages like XML, RDF/RDF schema and OWL are basis means that compose ontology schema. When composes and manages Ontology schema, one of the important consideration point is that schema is changed as times go by. Therefore, change of domain of schema, change of data concept or change of relation between resource etc. are reflected in the ontology system. In this study, we suggest semantic web schema management skill in terms of version management. We categorized version change forms and created version graph for checking of version transition. With created version graph, we define transitivity rule and propose schema tag for detail application which enables extending of applicable version schema.

• Journal of Korea Multimedia Society
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• v.8 no.7
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• pp.857-868
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• 2005

Schema clustering is important as a prerequisite to the integration of XML schemas. This paper presents an efficient method for clustering XML schemas. The proposed method first computes similarities among schemas. The similarity is defined by the size of the common structure between two schemas under the assumption that the schemas with less cost to be integrated are more similar. Specifically, we extract one-to-one matchings between paths with the largest number of corresponding elements. Finally, a hierarchical clustering method is applied to the value of similarity. Experimental results with many XML schemas show that the method has peformed better compared with previous works, resulting in a Precision of $99\%$ and a rate of clustering of $93\%$ in average.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.70-72
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• 2002

본 논문에서는 분산된 XML 문서를 수집 처리하여 상호 제공하는 과정에서 활용될 통합된 XML 문서의 전역 스키마를 생성하는 시스템을 제안한다. 제안된 시스템에서는 분산 환경에 존재하는 개별적인 XML 문서들에 대한 지역 스키마 정보를 관계형 데이터베이스로 구축하고, 통합된 XML 문서의 데이터를 기반으로 각각의 지역 스키마 데이터베이스를 검색한 후 데이터에 적합한 스키마 정의를 추출하게 된다. 또한 추출과정에서 중복 정의에 의한 충돌 범주를 분석하고, 이를 해결하는 방법도 제시하였다. 시스템 모델링 결과 XML 문서의 구조와 검증을 명확하게 보장하는 통합된 XHL 문서의 전역 스키마 생성과 지역 스키마간 발생되는 충돌문제 해결이 가능함을 알 수 있었다.