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The semantic grid

The semantic grid. Part 1: Discussion of the semantic grid Part 2: Correspondence with researchers. RJL Coetser - 21064475. Part 1 1.1 Definitions. Grid as in power grid The semantic web Semantic grid = semantic web + grid. 1.2 Grid architecture: OGSA philosophy and economy. Applications.

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The semantic grid

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  1. The semantic grid Part 1: Discussion of the semantic grid Part 2: Correspondence with researchers RJL Coetser - 21064475

  2. Part 11.1 Definitions • Grid as in power grid • The semantic web • Semantic grid = semantic web + grid

  3. 1.2 Grid architecture: OGSA philosophy and economy Applications GRB GSP GIS GMD “Hourglass Bottleneck” protocols – e.g. TCP/IP Hardware technologies, data physical layer GRB – Grid resource broker GSP - Grid Service Providers GMD - Grid Marketing Directory GIS – Grid Information Service OGSA – Open grid services architecture Based on reference [1] and [2]

  4. 1.3 The semantic web architecture OWL – A RDF vocabulary RDF – Resource Description Framework XML Unicode, text standards, URI reference OWL providing formal bases with description logic Standards available at www.w3c.org

  5. 1.4 Conceptual integration Knowledge layer The application of the semantics encapsulated in the second layer. Information layer Information access and storage, data with metadata for meaning/context Data layer Network infrastructure, connected scientific equipment Based on reference [3]

  6. 1.5 Technical Integration following from current architecture The grid: The semantic grid: Applications Applications GRB GSP GIS GMD GRB GSP GIS GMD “Hourglass Bottleneck” protocols – e.g. TCP/IP Semantic services Hardware technologies, data physical layer “Hourglass Bottleneck” protocols – e.g. TCP/IP Hardware technologies, data physical layer Applications GRB GSP GIS GMD GSM “Hourglass Bottleneck” protocols – e.g. TCP/IP Hardware technologies, data physical layer Based on slides 3,4 and 5 GSM – A hypothetical grid semantics service

  7. Part 22.1 Correspondence • Prof. Geoffrey Fox - Global Grid ForumSemantic Grid Research Group Chairman, Indiana University gcf@grids.ucs.indiana.edu • Prof. Carole Goble – Global Grid ForumSemantic Grid Research Group Chairman, University of Manchester carole@cs.man.ac.uk

  8. 2.2 Correspondence • Most current semantic grid systems still in prototype phase • Example system: • GEM – General Earthquake Model for realistic simulations • Part of SERVOGrid project under development at NASA • http://grids.ucs.indiana.edu/~maktas/servo/

  9. 2.3 Correspondence • Connection to semantic web technology: A sample GEM ontology in DAML (OWL predecessor) • Foundation for intelligent metadata layer for querying GEM objects (= code, data, scripts and documents) • Using WSDL to formulate queries • Sample of GEM ontology: <rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#' xmlns:rdfs='http://www.w3.org/2000/01/rdf-schema#' xmlns:daml='http://www.daml.org/2001/03/daml+oil#'> <daml:Ontology/> <daml:Datatype rdf:about='http://www.w3c.org/2000/10/XMLSchema#string'/> <rdfs:Class rdf:ID='ApplicationCode'> <daml:subClassOf> <rdfs:Class rdf:about='#GEMCode'/> </daml:subClassOf> </rdfs:Class>

  10. References • [1] Foster I., Kesselman C. and Tuecke S. The Anatomy of the Grid: Enabling Scalable Virtual Organizations. International Journal of Supercomputer applications. 2001. • [2] Buyya R., Abramson D., and Giddy J. A Case for Economy Grid Architecture for Service Oriented Grid Computing. In Proceedings 15th International Parallel and Distributed Processing Symposium. Pages 776 – 790. 23-27 April 2001. • [3] D. de Roure, N. Jennings, and N. Shadbolt. The semantic grid: A future e-science infrastructure. International Journal of Concurrency and Computation: Practice and Experience, 2003.

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