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Auflistung nach Autor:in "Martin, Michael"

1 - 5 von 5
  • Textdokument
    CubeViz.js: A Lightweight Framework for Discovering and Visualizing RDF Data Cubes
    (INFORMATIK 2017, 2017) Abicht, Konrad; Alkhouri, Georges; Arndt, Natanael; Meissner, Roy; Martin, Michael
    In this paper we present CubeViz.js, the successor of CubeViz, as an approach for lightweight visualization and exploration of statistical data using the RDF Data Cube vocabulary. In several use cases, such as the European Unions Open Data Portal, in which we deployed CubeViz, we were able to gather various requirements that eventually led to the decision of reimplementing CubeViz as JavaScript-only application. As part of this paper we showcase major functionalities of CubeViz.js and its improvements in comparison to the prior version.
  • Textdokument
    Discover Barrier-free Accessible Locations with the Location Navigator
    (INFORMATIK 2017, 2017) Abicht, Konrad; Ackermann, Simeon; Martin, Michael
    We present the current version of the Location Navigator, which supports users by finding locations in Leipzig, that can be accessed without barriers. Besides this current version of the prototype we present additionally experiences regarding its engineering process and the previously performed conversion of Open Data provided by the registered association Behindertenverband Leipzig e.V. (BVL). Our vision of the underlying data is an inter-commune data network, in order to support persons with special needs and, furthermore, to apply developments such as the Location Navigator to other municipalities. For this purpose, RDF will be used for the representation and linking of data in the future. Besides the presentation of the Location Navigator, we sketch some approaches we evaluated during the creation of the respective data model.
  • Konferenzbeitrag
    Exploring the Netherlands on a "Semantic Path"
    (The Social Semantic Web 2007 – Proceedings of the 1st Conference on Social Semantic Web (CSSW), 2007) Martin, Michael
    This poster gives an overview about the web application "vakantieland.nl", a Dutch Internet portal in the tourism domain. The core functionality is to provide information about holiday destinations, accommodation and other tourism related points-of-interest as well as a corresponding visualization with a mapping service. Because of the underlying semantic data structures and alternatively generated RFD output, vakantieland.nl can be considered to be a Semantic Web application. Its realization and functionalities, social aspects and furthermore an outlook about future development work constitute the main part of the poster.
  • Textdokument
    LEDSPLaY17
    (INFORMATIK 2017, 2017) Arndt, Natanael; Langer, André; Martin, Michael; Tramp, Sebastian
  • Textdokument
    SPARQL Update queries over R2RML mapped data sources
    (INFORMATIK 2017, 2017) Unbehauen, Jörg; Martin, Michael
    In the Linked Data Life Cycle mapping and extracting data from structured sources is an essential step in building a knowledge graph. In existing data life cycles this process is unidirectional, i.e. the data is extracted from the source but changes like cleaning and linking are not fed back into the originating system. SPARQL-to-SQL rewriters create virtual RDF without materializing data by exposing SPARQL endpoints. With the Update extension of our SparqlMap system we provide read/write access to structured data sources to enable a tighter integration of the source systems in knowledge refinement process. in this paper, we discuss three different update methods and further describe in two scenarios how the source system can benefit from feed back from the Linked Data integration.