Ara es mostren els items 1-20 de 31

  • A discussion on the design of graph database benchmarks 

    Domínguez Sal, David; Martínez Bazán, Norbert; Muntés Mulero, Víctor; Baleta Ferrer, Pedro; Larriba Pey, Josep (2011)
    Article
    Accés obert
    Graph Database Management systems (GDBs) are gaining popularity. They are used to analyze huge graph datasets that are naturally appearing in many application areas to model interrelated data. The objective of this paper ...
  • An inside analysis of a genetic-programming based optimizer 

    Muntés Mulero, Víctor; Aguilar Saborit, Josep; Larriba Pey, Josep; Zuzarte, Calisto; Markl, Volker (Institute of Electrical and Electronics Engineers, 2006)
    Text en actes de congrés
    Accés obert
    The use of evolutionary algorithms has been proposed as a powerful random search strategy to solve the join order problem. Specifically, genetic programming used in query optimization has been proposed as an alternative ...
  • Anonymizing data via polynomial regression 

    Nin Guerrero, Jordi; Pont Tuset, Jordi; Medrano Gracia, Pau; Larriba Pey, Josep; Muntés Mulero, Víctor (2007)
    Text en actes de congrés
    Accés obert
    The amount of confidential information accessible through the Internet is growing continuously. In this scenario, the improvement of anonymizing methods becomes crucial to avoid revealing sensible information of individuals. ...
  • Automated construction and analysis of political networks via open government and media sources 

    García-Olano, Diego; Arias Vicente, Marta; Larriba Pey, Josep (2016)
    Text en actes de congrés
    Accés obert
    We present a tool to generate real world political networks from user provided lists of politicians and news sites. Additional output includes visualizations, interactive tools and maps that allow a user to better understand ...
  • Automatic multi-partite graph generation from arbitrary data 

    Álvarez García, Sandra; Baeza Yates, Ricardo; Brisaboa, Nieves R.; Larriba Pey, Josep; Pedreira, Oscar (2014-08-22)
    Article
    Accés restringit per política de l'editorial
    In this paper we present a generic model for automatic generation of basic multi-partite graphs obtained from collections of arbitrary input data following user indications. The paper also presents GraphGen, a tool that ...
  • Branch classification to control instruction fetch in simultaneous multithreaded architectures 

    Knijnenburg, Peter M.W.; Ramírez Bellido, Alejandro; Latorre Salinas, Fernando; Larriba Pey, Josep; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2002)
    Text en actes de congrés
    Accés obert
    In simultaneous multithreaded architectures many separate threads are running concurrently, sharing processor resources, thereby realizing a high utilization rate of the available hardware. However, this also implies that ...
  • Cache-aware load balancing vs. cooperative caching for distributed search engines 

    Domínguez Sal, David; Pérez Casany, Marta; Larriba Pey, Josep (IEEE Computer Society Publications, 2009-06-25)
    Text en actes de congrés
    Accés obert
    In this paper we study the performance of a distributed search engine from a data caching point of view. We compare and combine two different approaches to achieve better hit rates: (a) send the queries to the node which ...
  • CIGO! Mobility management platform for growing efficient and balanced smart city ecosystem 

    Mrazovic, P.; Rubia Galera, Ivan de la; Urmeneta, J.; Balufo, C.; Tapias Guillen, Ricard; Matskin, M.; Larriba Pey, Josep (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    The massive amount of tourists, citizens and traffic in big cities usually collapse busy areas causing transport inefficiency, unbalanced economic growth, crime, and nuisance among citizens and visitors. Therefore, the ...
  • Cooperative cache analysis for distributed search engines 

    Domínguez Sal, David; Pérez Casany, Marta; Larriba Pey, Josep (2010)
    Article
    Accés restringit per política de l'editorial
    In this paper, we study the performance of a distributed search engine from a data caching point of view using statistical tools on a varied set of configurations. We study two strategies to achieve better performance: ...
  • DEX: High-performance exploration on large graphs for information retrieval 

    Martínez Bazán, Norbert; Muntés Mulero, Víctor; Gómez Villamor, Sergio; Nin Guerrero, Jordi; Sánchez Martínez, Mario; Larriba Pey, Josep (2007)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Link and graph analysis tools are important devices to boost the richness of information retrieval systems. Internet and the existing social networking portals are just a couple of situations where the use of these tools ...
  • Efficient graph management based on bitmap indices 

    Martínez Bazán, Norbert; Muntés Mulero, Víctor; Gómez Villamor, Sergio; Domínguez Sal, David; Águila Lorente, Miguel Ángel; Larriba Pey, Josep (Association for Computing Machinery (ACM), 2012)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    The increasing amount of graph like data from social networks, science and the web has grown an interest in analyzing the relationships between different entities. New specialized solutions in the form of graph databases, ...
  • Fetching instruction streams 

    Ramírez Bellido, Alejandro; Santana Jaria, Oliverio J.; Larriba Pey, Josep; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2002)
    Text en actes de congrés
    Accés obert
    Fetch performance is a very important factor because it effectively limits the overall processor performance. However there is little performance advantage in increasing front-end performance beyond what the back-end can ...
  • High quality, scalable and parallel community detection for large real graphs 

    Prat Pérez, Arnau; Domínguez Sal, David; Larriba Pey, Josep (Association for Computing Machinery (ACM), 2014)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Community detection has arisen as one of the most relevant topics in the field of graph mining, principally for its applications in domains such as social or biological networks analysis. Different community detection ...
  • Hybrid in-memory and on-disk tables for speeding-up table accesses 

    Guisado Gámez, Joan; Wolski, Antoni; Zuzarte, Calisto; Larriba Pey, Josep; Muntés Mulero, Víctor (Springer, 2010)
    Text en actes de congrés
    Accés obert
    Main memory database management systems have become essential for response-time-bounded applications, such as those in telecommunications systems or Internet, where users frequently access a table in order to get information ...
  • Hybrid tables for speeding-up data accesses in hybrid database management systems 

    Guisado Gámez, Joan; Wolski, Antoni; Zuzarte, Calisto; Larriba Pey, Josep; Muntés Mulero, Víctor (2011)
    Comunicació de congrés
    Accés obert
  • Improving microaggregation for complex record anonymization 

    Pont Tuset, Jordi; Nin Guerrero, Jordi; Medrano Gracia, Pau; Larriba Pey, Josep; Muntés Mulero, Víctor (Springer Verlag, 2008)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Microaggregation is one of the most commonly employed microdata protection methods. This method builds clusters of at least k original records and replaces the records in each cluster with the centroid of the cluster. ...
  • Increasing polynomial regression complexity for data anonymization 

    Nin Guerrero, Jordi; Pont Tuset, Jordi; Medrano Gracia, Pau; Larriba Pey, Josep; Muntés Mulero, Víctor (IEEE Computer Society, 2007)
    Text en actes de congrés
    Accés obert
    Pervasive computing and the increasing networking needs usually demand from publishing data without revealing sensible information. Among several data protection methods proposed in the literature, those based on linear ...
  • Instruction fetch architectures and code layout optimizations 

    Ramírez Bellido, Alejandro; Larriba Pey, Josep; Valero Cortés, Mateo (2001-11)
    Article
    Accés obert
    The design of higher performance processors has been following two major trends: increasing the pipeline depth to allow faster clock rates, and widening the pipeline to allow parallel execution of more instructions. Designing ...
  • Introduction to graph databases 

    Larriba Pey, Josep; Martínez Bazán, Norbert; Domínguez Sal, David (2014-09-08)
    Capítol de llibre
    Accés restringit per política de l'editorial
    The use of graphs in analytic environments is getting more and more widespread, with applications in many different environments like social network analysis, fraud detection, industrial management, knowledge analysis, ...
  • Massive query expansion by exploiting graph knowledge bases for image retrieval 

    Guisado Gámez, Joan; Domínguez Sal, David; Larriba Pey, Josep (Association for Computing Machinery (ACM), 2014)
    Text en actes de congrés
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    Annotation-based techniques for image retrieval suffer from sparse and short image textual descriptions. Moreover, users are often not able to describe their needs with the most appropriate keywords. This situation is a ...