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Author: search.filters.author.Chau, Vo Thi NgocSubject: search.filters.subject.Temporal database

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    A conceptual schema-based temporal meta database schemas generation technique for 3D objects
    (2010-01-01)
    Chau, Vo Thi Ngoc
    ;
    Chittayasothorn, Suphamit
    In this paper, a temporal meta database for three-dimensional (3D) objects whose properties and relationships are supported by valid time is introduced. Based on our proposed temporal object-oriented conceptual schema model, a conceptual schema of the temporal meta database can be generated from a 3D graphical data source and other particular application requirements. Based on our proposed temporal object relational data model with attribute timestamping, logical schemas of the temporal meta database can be systematically and automatically generated from the conceptual schema. From the temporal meta database, non-temporal/temporal metadata about temporal 3D objects are available for temporal information system users. Convenient access using database languages such as SQL can be performed. Queries over 3D objects using a temporal object relational SQL are demonstrated. © 2009 Springer-Verlag London Limited.
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    Temporal 3D graphical data management from a database perspective
    (2009-11-16)
    Chau, Vo Thi Ngoc
    ;
    Chittayasothorn, Suphamit
    According to recent advances in computer science and engineering, three dimensional (3D) graphical data is of growing interest in many application areas. In this paper, a data management technique is proposed to handle 3D graphical data with the time dimension from a database perspective. Different from the existing works, our technique deals with 3D graphical data in all of the three various aspects: the visual aspect for the 3D graphical data part, the semantic aspect for the metadata part, and especially the temporal aspect for changes over the time. As a result, 3D graphical data can be managed properly with semantics and time. Therefore, many front-end applications can conveniently have access to them at both graphical and semantic data levels for sharability and reusability. © 2009 IEEE.
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    A temporal object relational SQL language with attribute timestamping in a temporal transparency environment
    (2008-12-01)
    Chau, Vo Thi Ngoc
    ;
    Chittayasothorn, Suphamit
    In this paper, a temporal object relational SQL language is proposed. It is intended to facilitate the non-procedural data definitions, queries, and modifications of temporal databases with attribute timestamping in a temporal transparency environment. With attribute timestamping, temporal data of any type is naturally handled. With temporal logic, users can issue temporal queries in an intuitively expressive manner. The language provides valid time support for upward compatibility, temporal upward compatibility, sequenced and non-sequenced variants to serve both non-temporal and temporal users. Using object relational technology, the implementation is made for embedded and interactive SQL modes. All existing interfaces of an ORDBMS are inherited with temporal transparency. © 2008 Elsevier B.V. All rights reserved.