Exploració per autor "Abelló Gamazo, Alberto"Més informacióMés informació

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    • On the mismatch between multidimensionality and SQL 

      Romero Moral, Óscar; Abelló Gamazo, Alberto (2006-06)
      Report de recerca
      Accés obert
      ROLAP tools are intended to ease information analysis and navigation through the whole Data Warehouse. These tools automatically generate a query according to the multidimensional operations performed by the end-user, using ...

    • On the performance impact of using JSON, beyond impedance mismatch 

      Hewasinghage, Moditha Lakshan Dharmasir; Nadal Francesch, Sergi; Abelló Gamazo, Alberto (Springer, 2020)
      Text en actes de congrés
      Accés obert
      NOSQL database management systems adopt semi-structured data models, such as JSON, to easily accommodate schema evolution and overcome the overhead generated from transforming internal structures to tabular data (i.e., ...

    • On the predictive power of meta-features in OpenML 

      Bilalli, Besim; Abelló Gamazo, Alberto; Aluja Banet, Tomàs (2017-12-20)
      Article
      Accés obert
      The demand for performing data analysis is steadily rising. As a consequence, people of different profiles (i.e., non-experienced users) have started to analyze their data. However, this is challenging for them. A key step ...

    • On-line analytical processing 

      Abelló Gamazo, Alberto; Romero Moral, Óscar (Springer, 2017-01-21)
      Capítol de llibre
      Accés obert
      On-line analytical processing (OLAP) describes an approach to decision support, which aims to extract knowledge from a data warehouse, or more specifically, from data marts. Its main idea is providing navigation through ...

    • Open access semantic aware business intelligence 

      Romero Moral, Óscar; Abelló Gamazo, Alberto (Springer, 2013)
      Text en actes de congrés
      Accés obert
      The vision of an interconnected and open Web of data is, still, a chimera far from being accomplished. Fortunately, though, one can find several evidences in this direction and despite the technical challenges behind such ...

    • PatternLens: Inferring evolutive patterns from web API usage logs 

      Koçi, Rediana; Franch Gutiérrez, Javier; Jovanovic, Petar; Abelló Gamazo, Alberto (Springer, 2021)
      Text en actes de congrés
      Accés obert
      The use of web Application Programming Interfaces (WAPIs) has experienced a boost in recent years. Developers (i.e., WAPI consumers) are continuously relying on third-party WAPIs to incorporate certain features into their ...

    • POIESIS: A tool for quality-aware ETL process redesign 

      Theodorou, Vasileios; Abelló Gamazo, Alberto; Thiele, Maik; Lehner, Wolfgang (2015)
      Text en actes de congrés
      Accés obert
      We present a tool, called POIESIS, for automatic ETL process enhancement. ETL processes are essential data-centric activities in modern business intelligence environments and they need to be examined through a viewpoint ...

    • Potenciació del Moodle per a donar suport a l'aprenentatge semi-presencial 

      Abelló Gamazo, Alberto; Urpí Tobella, Antoni; Rodríguez, Elena; Burgués Illa, Xavier; Quer, Carme; Casany Guerrero, María José; Martín Escofet, Carme; Teniente López, Ernest; Muñoz, Jorge; Munné, Enric (2009-02-12T12:05:55Z)
      Text en actes de congrés
      Accés obert
      L’objectiu general del projecte era permetre que els alumnes preparessin les sessions de pràctiques amb antelació i de forma autònoma i fomentar que reintentessin els exercicis permetent-los millorar les seves qualificacions. ...

    • PRESISTANT : data pre-processing assistant 

      Bilalli, Besim; Abelló Gamazo, Alberto; Aluja Banet, Tomàs; Munir, Rana Faisal; Wrembel, Robert (Springer, 2019)
      Comunicació de congrés
      Accés obert
      A concrete classification algorithm may perform differently on datasets with different characteristics, e.g., it might perform better on a dataset with continuous attributes rather than with categorical attributes, or the ...

    • PRESISTANT: Learning based assistant for data pre-processing 

      Bilalli, Besim; Abelló Gamazo, Alberto; Aluja Banet, Tomàs; Wrembel, Robert (Elsevier, 2019-09)
      Article
      Accés obert
      Data pre-processing is one of the most time consuming and relevant steps in a data analysis process (e.g., classification task). A given data pre-processing operator can have positive, negative, or zero impact on the final ...

    • Puntuación entre iguales para la evaluación del trabajo en equipo 

      Abelló Gamazo, Alberto; Burgués Illa, Xavier (Universidad de Sevilla. Escuela Técnica Superior de Ingeniería Informática, 2011-07-05)
      Comunicació de congrés
      Accés obert
      La entrada en el EEES y la adopción de un sistema de evaluación basado en competencias, algunas de ellas no técnicas, hace que nos tengamos que plantear algún tipo de cambio, no solo en la forma de enseñar, sino también ...

    • Quality measures for ETL processes 

      Theodorou, Vasileios; Abelló Gamazo, Alberto; Lehner, Wolfgang (Springer, 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      ETL processes play an increasingly important role for the support of modern business operations. These business processes are centred around artifacts with high variability and diverse lifecycles, which correspond to key ...

    • Quality measures for ETL processes: from goals to implementation 

      Theodorou, Vasileios; Abelló Gamazo, Alberto; Lehner, Wolfgang; Thiele, Maik (2016-10-01)
      Article
      Accés obert
      Extraction transformation loading (ETL) processes play an increasingly important role for the support of modern business operations. These business processes are centred around artifacts with high variability and diverse ...

    • Quarry 

      Abelló Gamazo, Alberto; Romero Moral, Óscar; Jovanovic, Petar; Nadal Francesch, Sergi; Bilalli, Besim; Candón Arenas, Héctor; Mayorova, Daria; Thavornun, Varunya; Gil González, Daniel (2015-07-01)
      Programari
      Accés restringit per acord de confidencialitat

    • Quarry : digging up the gems of your data treasury 

      Jovanovic, Petar; Romero Moral, Óscar; Simitsis, Alkis; Abelló Gamazo, Alberto; Candón Arenas, Héctor; Nadal Francesch, Sergi (2015)
      Comunicació de congrés
      Accés obert
      The design lifecycle of a data warehousing (DW) system is primarily led by requirements of its end-users and the complexity of underlying data sources. The process of designing a multidimensional (MD) schema and back-end ...

    • Quarry: A user-centered big data integration platform 

      Jovanovic, Petar; Nadal Francesch, Sergi; Romero Moral, Óscar; Abelló Gamazo, Alberto; Bilalli, Besim (2021-02)
      Article
      Accés obert
      Obtaining valuable insights and actionable knowledge from data requires cross-analysis of domain data typically coming from various sources. Doing so, inevitably imposes burdensome processes of unifying different data ...

    • Reproducible experiments for generating pre-processing pipelines for AutoETL 

      Giovanelli, Joseph; Bilalli, Besim; Abelló Gamazo, Alberto; Silva Coira, Fernando; de Bernardo Roca, Guillermo (Elsevier, 2024-02)
      Article
      Accés restringit per política de l'editorial
      This work is a companion reproducibility paper of the experiments and results reported in Giovanelli et al. (2022), where data pre-processing pipelines are evaluated in order to find pipeline prototypes that reduce the ...

    • Requirement-driven creation and deployment of multidimensional and ETL designs 

      Jovanovic, Petar; Romero Moral, Óscar; Simitsis, Alkis; Abelló Gamazo, Alberto (Springer, 2012)
      Text en actes de congrés
      Accés obert
      We present our tool for assisting designers in the error-prone and time-consuming tasks carried out at the early stages of a data warehousing project. Our tool semi-automatically produces multidimensional (MD) and ETL ...

    • Resilient store: a heuristic-based data format selector for intermediate results 

      Munir, Rana Faisal; Romero Moral, Óscar; Abelló Gamazo, Alberto; Bilalli, Besim; Thiele, Maik; Lehner, Wolfgang (2016)
      Número de revista
      Accés obert
      Large-scale data analysis is an important activity in many organizations that typically requires the deployment of data-intensive workflows. As data is processed these workflows generate large intermediate results, which ...

    • Semantic web technologies for business intelligence 

      Berlanga, Rafael; Romero Moral, Óscar; Simitsis, Alkis; Nebot, Victoria; Pedersen, Torben; Abelló Gamazo, Alberto; Aramburu, María José (IGI Global, 2011)
      Capítol de llibre
      Accés restringit per política de l'editorial
      This chapter describes the convergence of two of the most influential technologies in the last decade, namely business intelligence (BI) and the Semantic Web (SW). Business intelligence is used by almost any enterprise to ...