Recent Submissions

  • Process mining meets abstract interpretation 

    Carmona Vargas, Josep; Cortadella Fortuny, Jordi (2010-07)
    External research report
    Open Access
    The discovery of process models out of system traces is an interesting problem that has received significant attention in the last years. In this work, a theory for the derivation of a Petri net from a set of traces is ...
  • Comparing error minimized extreme learning machines and support vector sequential feed-forward neural networks 

    Romero Merino, Enrique; Alquézar Mancho, René (2010-06)
    External research report
    Open Access
    Recently, error minimized extreme learning machines (EM-ELMs) have been proposed as a simple and efficient approach to build single-hidden-layer feed-forward networks (SLFNs) sequentially. They add random hidden nodes one ...
  • The Virtual Magic Lantern: An interaction metaphor for enhanced medical data inspection 

    Monclús Lahoya, Eva; Díaz Iriberri, José; Navazo Álvaro, Isabel; Vázquez Alcocer, Pere Pau (2010-03)
    External research report
    Open Access
    In Volume Rendering, it is difficult to simultaneously visualize interior and exterior structures. Several approaches have been developed to solve this problem, such as cut-away or exploded views. Nevertheless, in most ...
  • A multi-client architecture for hybrid terrain rendering on mobile devices 

    Noguera, José María; Segura Sánchez, Rafael Jesús; Ogáyar, Carlos; Joan Arinyo, Robert (2010-06)
    External research report
    Open Access
    Mobile devices such as Personal Digital Assistants (PDAs) or smart phones are rapidly increasing their graphics and networking capabilities. However, real-time rendering of large terrains is still a challenging task to ...
  • Geometric constraint problems and solution instances 

    Hidalgo Garcia, Marta; Joan Arinyo, Robert; Soto Riera, Antoni (2010-05)
    External research report
    Open Access
    Geometric constraint solving is a growing field devoted to solve geometric problems defined by relationships, called constraints, established between the geometric elements. In this work we show that what characterizes a ...
  • Skeleton computation of an image using a geometric approach 

    Martínez Bayona, Jonàs; Vigo Anglada, Marc; Pla García, Núria; Ayala Vallespí, M. Dolors (2010-03)
    External research report
    Open Access
    In this work we develop two algorithms to compute the skeleton of a binary 2D images. Both algorithms follow a geometric approach and work directly with the boundary of the image wich is an orthogonal polygon (OP). One of ...
  • Structural parameters 

    Ayala Vallespí, M. Dolors; Vergés, Eduard (2010-02)
    External research report
    Open Access
    The development of the bioengineering field has yield to the apparition of a new application of the Computer-Aided-Design, Bio-CAD, aiming to the use of computer models to represent biological samples and methods to simulate ...
  • A hybrid client-server based technique for navigation in large terrains using mobile devices 

    Noguera, José María; Segura Sánchez, Rafael Jesús; Ogáyar, Carlos; Joan Arinyo, Robert (2010-01)
    External research report
    Open Access
    We describe a hybrid client-server technique for remote adaptive streaming and rendering of large terrains in resource-limited mobile devices. The technique has been designed to achieve an interactive rendering performance ...
  • Process mining from a basis of state regions 

    Solé, Marc; Carmona Vargas, Josep (2010-01)
    External research report
    Open Access
    A central problem in the area of Process Mining is to obtain a formal model that represents selected behavior of a system. The theory of regions has been applied to address this problem, enabling the derivation of a Petri ...
  • Multikey Quickselect 

    Frias Moya, Leonor; Roura Ferret, Salvador (2009-07)
    External research report
    Open Access
    In this paper we introduce Multikey Quickselect: an efficient, in-place, and easy to implement algorithm for the selection problem for strings. We present several variants of our basic algorithm, which apply to two different ...

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