• Title/Summary/Keyword: 스키마버전

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A Schema Version Model for Composite Objects in Object-Oriented Databases (객체지향 데이터베이스의 복합 객체를 위한 스키마 버전 모델)

  • Lee, Sang-Won;Kim, Hyeong-Ju
    • Journal of KIISE:Software and Applications
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    • v.26 no.4
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    • pp.473-486
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    • 1999
  • 본 논문에서는 복합개체 계층구조의 재구성을 지원하는 객체지향 데이터베이스 스키마 버전모델을 제안한다. 이 모델은 풍부한 기본 스키마(Rich Base Schema)개념에 기반한 스키마 버전 모델 RIBS를 확장한다. RiBS 모델에서 각 스키마 버전은 하나의 기본 스키마에 대한 갱신가능한 클래스 계층구조 뷰이고 , 이 기본 스키마는 모든 스키마버전들에서 필요로 하는 스키마 정보를 갖고 있다. 본 논문에서는 스키마 버전의 복합객체 계층구조의 재구성을 위한 스키마 진화연산들을 도입하고, 이 연산들의 의미를 설명한다. 그리고 이 연산들을 통해 재구성된 복합개체 계층구조에서 대한 질의의 처리 방안을 다룬다. 또 한, 둘 이상의 스키마 버전 통합시 발생하는 복합객체 재구성 연산들에 의한 충돌현상을 설명하고 해결책을 제시한다. 본 논문의 독창성은 1) 복합객체 계층구조의 재구성을 위한 연산들을 최초로 도입한 점과 2) 확장된 RiBS 모델이 객체지향 데이터베이스의 데이터독립성(data independence)을 제공한다는 점이다.

Design and Implementation of an Instance Access Handling System for Supporting Schema Evolution (스키마 진화를 지원하는 인스턴스 접근처리시스템의 설계 및 구현)

  • Jin, Min;Kim, Bong-Jin
    • The Transactions of the Korea Information Processing Society
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    • v.7 no.12
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    • pp.3753-3761
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    • 2000
  • There exist several versions of schema and instances created under different versions of the schema concurrently in the database in schema evolution environments. This paper proposes a mechanism for accessing instances regardless of versions in schema evolution environments in object relational databases. Access handling routines are used in accessing to the instances through the undefined attributes in the versions in which they were created. The change of semantic information of attributes is supported. Access handling routines are defined for each pair of semantics rather than defining backdate/update functions for each pair of versions of a class. A query language that accommodates version and semantic information is defined through the extension of the primitive SQL format.

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Schema management skills for semantic web construction (시멘틱웹 구축을 위한 스키마 관리 기법 연구)

  • Kim, Byung-Gon;Oh, Sung-Kyun
    • 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.

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An Efficient Versioning Method for XML Document Repository System (XML 문서 저장관리 시스템을 위한 효율적인 버전닝 기법)

  • 손충범;배양석;유재수
    • Journal of Internet Computing and Services
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    • v.3 no.4
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    • pp.37-50
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    • 2002
  • XML document repositary system(XDRS) should be able to manage vertical and horizontal versions of documents to store, update and manage XML documents without loss of information, However, most of existing XDRSs do not support a versioning method Although a few systems support versioning method. they only manage vertical versions of XML documents, While the vertical versioning preserves the update history of documents. the horizontal versioning branches a document to many other versions of documents so that users can easily create new documents from the original version and edit them to have different meanings. In this paper, we propose a new version numbering scheme to support both vertical and horizontal versioning efficiently. We also design a schema that supports versioning and preserves the paradigm of structure information.

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Application Program Independent Schema Evolution in Relational Databases (관계형 데이타베이스를 위한 응용 프로그램 독립적인 스키마 진화)

  • 나영국
    • Journal of KIISE:Databases
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    • v.31 no.5
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    • pp.445-456
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    • 2004
  • The database schema is assumed to be stable enough to remain valid even as the modeled environment changes. However, in practice. data models are not nearly as stable as commonly assumed by the database designers. Even though a rich set of schema change operations is provided in current database systems, the users suffer from the problem that schema change usually impacts existing application programs that have been written against the schema. In this paper, we are exploring the possible solutions to overcome this problem of impacts on the application programs. We believe that for continued support of the existing programs on the old schema, the old schema should continue to allow updates and queries, as before. Furthermore, its associated data has to be kept up-to-date. We call this the program independency property of schema change tools. For this property. we devise so-called program independency schema evolution (PISE) methodology. For each of the set of schema change operations in the relational schemas, the sketch of the additional algorithms due to the PISE compliance is presented in order to prove the comprehensiveness and soundness of our PISE methodology.

Change Detection and Management Scheme of OWL Documents (OWL 문서의 변경 탐지 및 관리 기법)

  • Kim, Youn-Hee;Kim, Jee-Hyun
    • Journal of Digital Contents Society
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    • v.13 no.1
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    • pp.43-52
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    • 2012
  • For accurate search on information resources, it is needed to manage gradual changes in ontology efficiently. Recently, because ontology is often written using OWL, techniques that can manage changes in OWL documents are required. To meet these needs, in this paper, we classify changeable elements to detect changes in OWL ontology and propose a storage schema that can manage the changes according to the characteristics of each element. And we suggest the possibility of improving performance of query processing using views that provide information about classes or properties in each ontology version. The proposed storage schema stores changes in metadata associated with each ontology version. In addition, it can manage metadata that must be added or deleted through reasoning when ontology changes. So, the proposed storage schema can support queries about history of changes in ontology and provide accurate and valid metadata that is suitable for user-selected ontology version.

Storage Policies for Versions Management of XML Documents using a Change Set (변경 집합을 이용한 XML 문서의 버전 관리를 위한 저장 기법)

  • Yun Hong Won
    • The KIPS Transactions:PartD
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    • v.11D no.7 s.96
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    • pp.1349-1356
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    • 2004
  • The interest of version management is increasing in electronic commerce requiring data mining and documents processing system related to digital governmentapplications. In this paper, we define a change set that is to manage historicalinformation and to maintain XML documents during a long period of time and propose several storage policies of XML documents using a change set. A change set includes a change oper-ation set and temporal dimensions and a change operation set is composed with schema change operations and data change operations. We pro-pose three storage policies using a change set. Three storage policies are (1) storing all the change sets, (2) storing the change sets and the versions periodically. (3) storing the aggregation of change sets and the versions at a point of proper time. Also, we compare the performance between the existing storage policy and the proposed storage policies. Though the performance evaluation, we show that the method to store the aggregation of change sets and the versions at a point of proper time outperforms others.

A Development of 2D CAD Information Model based on STEP in Construction (STEP 기반의 건설분야 도면 정보 모델링에 관한 연구)

  • Kim, Seong-Sig;Jeong, Seong-Yun;Na, Hei-Sook;Lim, Kyoung-Il
    • Proceedings of the Korea Information Processing Society Conference
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    • 2000.10a
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    • pp.227-230
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    • 2000
  • 건설 도면정보의 공유 및 교환은 건설 CALS/EC(Continuous Acquisition & Lifecycle Support /Electronic commerce) 환경의 필수적인 요소이다. 그러나 CAD 시스템의 버전변화와 별도의 한글처리로 인하여 도면정보의 관리 렌 활용에 많은 문제점이 발생하고, 상이한 CAD 시스템간의 파일 교환이 제대로 이루어지지 못하는 등 도면정보 교환을 위한 정보모델의 구축이 절실히 요구되고 있다. 이러한 환경에서 STEP(Standard for the Exchange of Product model data)은 건설 도면정보의 교환 및 공유를 위한 정보모델을 구축함에 있어서 그 활용 가능성이 높다. 본 연구에서는 STEP을 이용하여 건설분야에서 활용 가능한 2차원 도면정보 모델을 개발하고자 한다. 이를 위하여 STEP내의 AP 202를 기반으로, AP 214와 독일의 2차원 도면정보 표준화 프로젝트인 STEP-CDS를 참조하도록 한다. 그리고 실제 개발된 도면정보모델이 기존 CAD 도면 데이터를 제대로 표현할 수 있는지 검증하기 위하여 상용 CAD시스템인 AutoCAD Rl4의 DXF 데이터를 개발된 정보모델로 변환하여 그 결과를 검토하고자 한다. 세부적으로는 DXF 데이터의 도면정보모델로의 변환을 위하여 DXF 구조의 STEP 스키마를 정의한다. 이때 이 스키마와 도면정보모델의 스키마간의 매핑을 위하여 STEP내의 EXPRESS-X를 이용하기로 한다. 또한 도면정보 모델의 데이터의 뷰잉과 브라우징을 위하여 도면정보 뷰어를 개발한다.

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An Approach for Integrated Modeling of Protein Data using a Fact Constellation Schema and a Tree based XML Model (Fact constellation 스키마와 트리 기반 XML 모델을 적용한 실험실 레벨의 단백질 데이터 통합 기법)

  • Park, Sung-Hee;Li, Rong-Hua;Ryu, Keun-Ho
    • 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.