Browsing by Author "921f8454-1c31-4934-b0e8-b735c7c2a329;orcid:0000-0003-3773-3382"Més informació

Now showing items 1-14 of 14

    • A cost model for random access queries in document stores 

      Hewasinghage, Moditha Lakshan Dharmasir; Abelló Gamazo, Alberto; Varga, Jovan; Zimányi, Esteban (2021-07)
      Article
      Open Access
      Document stores have become one of the key NoSQL storage solutions. They have been widely adopted in different domains due to their ability to store semi-structured data and expressive query capabilities. However, ...

    • Analytical metadata modeling for next generation BI systems 

      Varga, Jovan; Romero Moral, Óscar; Bach Pedersen, Torben; Thomsen, Christian (2018-10)
      Article
      Open Access
      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 ...

    • FAME: supporting continuous requirements elicitation by combining user feedback and monitoring 

      Oriol Hilari, Marc; Stade, Melanie; Fotrousi, Farnaz; Nadal Francesch, Sergi; Varga, Jovan; Seyff, Norbert; Abelló Gamazo, Alberto; Franch Gutiérrez, Javier; Marco Gómez, Jordi; Schmidt, Oleg (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference report
      Open Access
      Context: Software evolution ensures that software systems in use stay up to date and provide value for end-users. However, it is challenging for requirements engineers to continuously elicit needs for systems used by ...

    • GraphQL schema generation for data-intensive web APIs 

      Farré Tost, Carles; Varga, Jovan; Almar Graupera, Robert (Springer, 2019)
      Conference report
      Open Access
      Sharing data as a (non-)commercial asset on the web is typically performed using an Application Programming Interface (API). Although Linked Data technologies such as RDF and SPARQL enable publishing and accessing data ...

    • Managing polyglot systems metadata with hypergraphs 

      Hewasinghage, Moditha Lakshan Dharmasir; Abelló Gamazo, Alberto; Varga, Jovan; Zimányi, Esteban (Elsevier, 2021-07)
      Article
      Open Access
      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 ...

    • Managing polyglot systems metadata with hypergraphs 

      Hewasinghage, Moditha Lakshan Dharmasir; Varga, Jovan; Abelló Gamazo, Alberto; Zimányi, Esteban (2018)
      Conference report
      Open Access
      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 ...