Now showing items 1-10 of 10

  • Analytical metadata modeling for next generation BI systems 

    Varga, Jovan; Romero Moral, Óscar; Bach Pedersen, Torben; Thomsen, Christian (2018-10)
    Article
    Restricted access - publisher's policy
    Business Intelligence (BI) systems are extensively used as in-house solutions to support decision-making in organizations. Next generation BI 2.0 systems claim for expanding the use of BI solutions to external data sources ...
  • Big data management challenges in SUPERSEDE 

    Nadal Francesch, Sergi; Abelló Gamazo, Alberto; Romero Moral, Óscar; Varga, Jovan (CEUR-WS.org, 2017)
    Conference report
    Open Access
    The H2020 SUPERSEDE (www.supersede.eu) project aims to support decision-making in the evolution and adaptation of software services and applications by exploiting end-user feedback and runtime data, with the overall goal ...
  • Dimensional enrichment of statistical linked open data 

    Varga, Jovan; Vaisman, Alejandro; Romero Moral, Óscar; Etcheverry, Lorena; Bach Pedersen, Torben; Thomsen, Christian (2016-10-01)
    Article
    Open Access
    On-Line Analytical Processing (OLAP) is a data analysis technique typically used for local and well-prepared data. However, initiatives like Open Data and Open Government bring new and publicly available data on the web ...
  • Managing polyglot systems metadata with hypergraphs 

    Hewasinghage, Moditha Lakshan Dharmasir; Varga, Jovan; Abelló Gamazo, Alberto; Zimányi, Esteban (2018)
    Conference report
    Restricted access - publisher's policy
    A single type of data store can hardly fulfill every end-user requirements in the NoSQL world. Therefore, polyglot systems use different types of NoSQL datastores in combination. However, the heterogeneity of the data ...
  • Multidimensional query recommendation 

    Varga, Jovan (Universitat Politècnica de Catalunya, 2011-06-23)
    Master thesis
    Open Access
    In this master thesis we will first summarize the recent efforts to support analytical tasks over relational sources. These efforts have pointed out the necessity to come up with flexible, powerful means for analyzing the ...
  • QB2OLAP : enabling OLAP on statistical linked open data 

    Varga, Jovan; Etcheverry, Lorena; Vaisman, Alejandro; Romero Moral, Óscar; Bach Pedersen, Torben; Thomsen, Christian (2016)
    Conference report
    Open Access
    Publication and sharing of multidimensional (MD) data on the Semantic Web (SW) opens new opportunities for the use of On-Line Analytical Processing (OLAP). The RDF Data Cube (QB) vocabulary, the current standard for ...
  • Semantic metadata for supporting exploratory OLAP 

    Varga, Jovan (Universitat Politècnica de Catalunya, 2017-01-24)
    Doctoral thesis
    Open Access
    Covenantee:  Aalborg universitet
    On-Line Analytical Processing (OLAP) is an approach widely used for data analysis. OLAP is based on the multidimensional (MD) data model where factual data are related to their analytical perspectives called dimensions and ...
  • SM4AM : a semantic metamodel for analytical metadata 

    Varga, Jovan; Romero Moral, Óscar; Pedersen, Torben; Thomsen, Christian (2014)
    Conference report
    Restricted access - publisher's policy
    Next generation BI systems emerge as platforms where traditional BI tools meet semi-structured and unstructured data coming from the Web. In these settings, the user-centric orientation represents a key characteristic for ...
  • SM4MQ: a semantic model for multidimensional queries 

    Varga, Jovan; Dobrokhotova, Ekaterina; Romero Moral, Óscar; Bach Pedersen, Torben; Thomsen, Christian (Springer, 2017)
    Conference report
    Open Access
    On-Line Analytical Processing (OLAP) is a data analysis approach to support decision-making. On top of that, Exploratory OLAP is a novel initiative for the convergence of OLAP and the Semantic Web (SW) that enables the use ...
  • Towards next generation BI systems : the analytical metadata challenge 

    Varga, Jovan; Romero Moral, Óscar; Pedersen, Torben; Thomsen, Christian (Springer, 2014)
    Conference report
    Restricted access - publisher's policy
    Next generation Business Intelligence (BI) systems require integration of heterogeneous data sources and a strong user-centric orientation. Both needs entail machine-processable metadata to enable automation and allow end ...