• Journal of Navigation and Port Research
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• v.26 no.4
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• pp.427-433
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• 2002

Since current HTML used on the internet is to use restricted tag, it is not easy to store information and extract data from information of document. XML defined newly tag and is easy to store information and extract data from information. So XML is easier to transact information rather than HTML. XML is suitable for enterprise's requirement needs data exchange between heterogeneous databases. This paper proposes web agent for data replication between heterogeneous DBMSs(Database Management System). Web agent system maneges database on the web and exchange data in heterogeneous database using XML. Then we designed and implemented for web agent of data replication between heterogeneous DBMSs.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.47-50
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• 2004

XML 은 데이터 저장과 전송을 위한 수단으로 자리잡아 가고 있으며, 관계형 DBMS를 이용해서 효과적으로 대용량의 XML 데이터의 저장과 검색에 관한 연구가 진행 되고 있다. 본 논문에서는 기 제안된 XPath Accelerator 라는 XML 데이터 인덱스 메커니즘을 상용 관계형 DBMS를 활용해서 구현하고, 이를 해당 DBMS 상에서 최대한의 성능을 위해 튜닝하는 방안을 기술한다. 이를 위해 XBench 라는 XML 전용 벤치마크 데이터를 활용해서 XPath Accelerator 의 문제점과 향후 개선 방안에 대해서도 논의한다.

• The KIPS Transactions:PartD
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• v.11D no.2
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• pp.317-324
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• 2004

Containment queries for XML documents is one of the most important query types, and thus the efficient support for this type of query is crucial for XML databases. Recently, object-relational database management system (ORDBMS) vendors try to store and retrieve XML data in their products. In this paper, we propose an extensible index to support containment queries over the XML data stored as BLOB type in ORDBMSs. That is, we describe how to implement the index using the extensibility feature of an ORDBMS, and describe its usage.

• Journal of Information Technology Applications and Management
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• v.9 no.1
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• pp.71-84
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• 2002

As the application area of XML extends to the database from simple contents, the technology for the storage and management of XML also grows with the XML. One of the main issues is how to efficiently manage the XML by using the previous DBMS. Many studies have been performed for the efficient management based on the XML application and database interface. However, the XML data is based on the object and has the hierarchical structure. Accorkingly, a modeling plan needs to store the XML data on the variety type of database. In this paper, for easier connection between XML application and database system, we have designed components for the transformation from XML DTD to ORDB schema. The method of the design for the transformation from XML DTD to ORDB schema is chosen the method of CBD.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.40-42
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• 2002

XML 문서가 웹에서 많이 사용됨에 따라, 기존의 DBMS를 이용하여 XML 문서를 저장하고 관리하는 XML 저장 시스템에 대한 연구가 활발히 진행 중이다. 그러나 지금까지의 연구는 대부분 풍부한 모델링 기능을 제공하는 객체관계형 DBMS보다는 관계형 DBMS에 기반하여 이루어져 왔다. 본 논문에서는 오디세우스 객체관계형 DBMS를 위한 XML 저장 시스템인 ODYSSEUS/XMLStore를 설계하고 구현한다. 첫째, XML 문서 구조에서 객체관계형 데이타베이스 스키마로의 매핑에 대해 분석한다. 둘째, 분석된 매핑을 기술하는 방법을 표준 언어인 XML Schema를 활용하여 제안한다. 셋째, 사용자가 정의한 매핑 정보에 의거하여 XML 문서를 객체관계형 데이타베이스에 저장하는 세부 알고리즘을 제안한다.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2007.02a
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• pp.163-167
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• 2007

We propose an XML document storage system, called XDMS (XML Document Management System), by using an object-relational DBMS. XDMS generates object database schema from XML Schema and stores the XML documents in an object-relational database. SAX parser is used for understanding the structure of the XML documents, and XDMS transforms the documents into objects in the database. Experiment shows that object-relational databases provide more efficient storage and query model compared with relational databases.

• The Journal of Information Technology and Database
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• v.7 no.2
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• pp.17-32
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• 2000

As XML emerging as the Internet electronic document language standard of the next generation, the number of XML documents which contain vast amount of Information is increasing substantially through the transformation of existing documents to XML documents or the appearance of new XML documents. Consequently, XML document retrieval system becomes extremely essential for searching through a large quantity of XML documents that are storied in and managed by DBMS. In this paper we describe the design and implementation of BADA-IV/XML query processor that supports content-based, structure-based and attribute-based retrieval. We design XML query language based upon XQL (XML Query Language) of W3C and tightly-coupled with OQL (a query language for object-oriented database). XML document is stored and maintained in BADA-IV, which is an object-oriented database management system developed by ETRI (Electronics and Telecommunications Research Institute) The storage data model is based on DOM (Document Object Model), therefore the retrieval of XML documents is executed basically using DOM tree traversal. We improve the search performance using Node ID which represents node's hierarchy information in an XML document. Assuming that DOW tree is a complete k-ary tree, we show that Node ID technique is superior to DOM tree traversal from the viewpoint of node fetch counts.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.151-153
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• 2005

유비쿼터스 연구가 진행되면서 서로 데이터 모델이 안지 않는 이기종 데이터베이스 간의 데이터 교환이 중요한 문제로 대두되었다. XML문서는 데이터 호환성이 뛰어나 유비쿼터스 환경에 맞는 데이터 교환 수단으로 적합하다. 데이터베이스 시스템의 장점때문에 XML 문서를 객체 관계 데이터베이스에 저장하는 연구가 진행되었다. 객체 관계 데이터베이스 시스템에 XML 문서를 저장하고 질의하는 방법에는 여러 가지가 있다. 이 논문에서는 분산 환경에서 객체 관계 데이터베이스 시스템에 XML 문서를 저장하고 질의하는 방법을 논의하고, 성능 평가를 수행한다.

• The Journal of Society for e-Business Studies
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• v.13 no.2
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• pp.213-223
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• 2008

The efficient discovery of services from a large scale collection of services has become an important issue[7, 24]. We studied a syntactic method for Web service discovery, rather than a semantic method. We regarded a service discovery as a retrieval problem on the proprietary XML formats, which were service descriptions in a registry DB. We modeled services and queries as probabilistic values and devised similarity-based retrieval techniques. The benefits of our way are follows. First, our system supports ranked service retrieval by keyword search. Second, we considers both of UDDI data and WSDL definitions of services amid query evaluation time. Last, our technique can be easily implemented on the off-theshelf DBMS and also utilize good features of DBMS maintenance.

• Journal of KIISE:Databases
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• v.31 no.4
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• pp.432-443
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• 2004

As the XML data has been widely used in the Internet, it is necessary to store and retrieve the XML data by using DBMSs. However, relational DBMSs suffer from the model difference between graph structure of the XML data and table forms in relational databases. We propose an ORDBMS-based DTD-dependent XML data management system Xing. Xing stores XML data in a DTD-dependent form in an object database. Since the object database schema has a graph structure and supports multi-valued attributes, mapping from an XML data model and queries into an object data model and OQLs is a simple problem. For rapid storing of large quantities of the XML data, we use SAX parser with customized Xing-tree which requires a small memory space compared with the DOM-tree. Xing also returns the query result in an XML document form. We have implemented the Xing system on top of UniSQL object-relational DBMS for the validity checking and performance comparison. For XML genome data from GenBank, and experimental evaluation shows that Xing can provide significant performance improvement (maximum 10 times) compared with the relational approach.