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Visar resultat 1 - 5 av 13 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Querying RDF Schema Views of Relational Databases

    Författare :Johan Petrini; Tore Risch; Larry Kerschberg; Uppsala universitet; []
    Nyckelord :query processing; partial evaluation; rdf; rdf schema; view; relational databases; semantic web;

    Sammanfattning : The amount of data found on the web today and its lack of semantics makes it increasingly harder to retrieve a particular piece of information. With the Resource Description Framework (RDF) every piece of information can be annotated with properties describing its semantics. LÄS MER

  3. 2. Scalable Preservation, Reconstruction, and Querying of Databases in terms of Semantic Web Representations

    Författare :Silvia Stefanova; Tore Risch; Stefan Decker; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; RDF; RDFS; RDF view; SPARQL; SPARQL query processing; rewrite optimization; Topic Maps; querying of RDF views; archive relational databases; reconstruct archived databases; Datavetenskap med inriktning mot databasteknik; Computer Science with specialization in Database Technology;

    Sammanfattning : This Thesis addresses how Semantic Web representations, in particular RDF, can enable flexible and scalable preservation, recreation, and querying of databases.An approach has been developed for selective scalable long-term archival of relational databases (RDBs) as RDF, implemented in the SAQ (Semantic Archive and Query) system. LÄS MER

  4. 3. Constructing Large Multilingual Proposition Databases

    Författare :Peter Exner; Institutionen för datavetenskap; []
    Nyckelord :;

    Sammanfattning : This thesis explores methods for generating proposition databases in a large-scale and multilingual setting. Our methods are centered on using semantic role labeling for extracting predicate-argument structures, and the subsequent transformation of such structures for knowledge base population and generation. LÄS MER

  5. 4. Object views of relational data in multidatabase systems

    Författare :Gustav Fahl; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In a multidatabase system it is possible to access and update data residing in multiple databases. The databases may be distributed, heterogeneous, and autonomous. The first part of the thesis provides an overview of different kinds of multidatabase system architectures and discusses their relative merits. LÄS MER

  7. 5. A Uniform Query Processing Approach for Integrating Data from Heterogeneous Resources

    Författare :Merja Karjalainen; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Query processing; Functional data model; Rewrite rules; Data integration;

    Sammanfattning : Scientists who need to explore several different databases in theirresearch can find it difficult and tedious to extract and combineinformation from various heterogeneous data sources manually.This is a particular problem for researchers in the life sciences,since technical advances in the last decade have resulted in a dramaticincrease in the quantity and variety of data. LÄS MER