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Auflistung nach Autor:in "Toma, Ioan"

1 - 4 von 4
  • Konferenzbeitrag
    An evaluation of discouvery approaches in Grid and Web services environments
    (NODe 2005 – GSEM 2005, 2005) Toma, Ioan; Iqbal, Kashif; Moran, Matthew; Roman, Dumitru; Strang, Thomas; Fensel, Dieter
  • Konferenzbeitrag
    Grid resource ontologies and asymmetric resource-correlation
    (NODe 2005 – GSEM 2005, 2005) Siddiqui, Mumtaz; Fahringer, Thomas; Hofer, Jürgen; Toma, Ioan
  • Konferenzbeitrag
    Optimizing semantic web services ranking using parallelization and rank aggregation techniques
    (INFORMATIK 2010 – Business Process and Service Science – Proceedings of ISSS and BPSC, 2010) Toma, Ioan; Ding, Ying; Fensel, Dieter
    The problem of combining many rank orderings of the same set of candidates, also known as the rank aggregation problem, has been intensively investigated in the context of Web (e.g meta-search) databases (e.g combining results from multiple databases), statistics (e.g. correlations), and last but not least sports and elections competitions. In this paper we investigate the use of rank aggregation in the context of Semantic Web services. More precisely we propose an optimization technique for ranking Semantic Web services based on non-functional properties by using parallelization and rank aggregation methods. Instead of using a ranking algorithm over the entire set of non-functional properties our approach splits the set of non-functional properties in multiple subsets, runs the ranking algorithm on each of the subsets and finally aggregates the resulting ranked lists of services into one unifying ranked list. Experimental results reported in this paper show improvements of our initial rank aggregation method both in terms of quality and processing time.
  • Konferenzbeitrag
    Publication and Discovery of Semantically Annotated Geospatial Web Services
    (EnviroInfo Dessau 2012, Part 1: Core Application Areas, 2012) Larizgoitia, Iker; Beltran, Arturo; Toma, Ioan; Maué, Patrick
    Environmental information and services have become a crucial asset in the creation of decission support systems. Unfortunately, this information and services are not usually exposed in an interoperable and standard way, limiting their reusability and impact in the community. Publishing and discovering geospatial information and services on the Web is therefore an important challenge in order to create a breeding ground for collaboration and more sophisticated environmental platforms. Based on common standards defined by the Open Geospatial Consortium (OGC) as the starting point to ensure interoperability, we propose a discovery mechanism based on semantic annotations. OGC service descriptions are annotated with SAWSDL and linked to concepts in domain ontologies, following a common semantic service model. We seamlessly integrate the semantics in the standard OGC discovery infrastructure, extending the CSW service catalogues with semantic publication and discovery. Semantics queries can be created based on formal languages like WSML, significantly improving the precission of discovery. In this paper we present our approach, which provides a semantic infrastructure for publication and discovery of environmentally enabled web services.