Now showing items 1-18 of 18

  • 3D simulation of tool machining 

    Puig Puig, Anna; Pérez Vidal, Lluís; Tost Pardell, Daniela (2001-12)
    External research report
    Open Access
    This paper describes a three-dimensional tool machining simulation system. The initial tool and the grinding wheels are integrated with the machine-tool. The application reads and interprets the CNC program code that ...
  • An Adaptive algorithm to compute the medial axis transform of 2-D polygonal domains 

    Joan Arinyo, Robert; Pérez Vidal, Lluís; Gargallo Monllau, Elies (1995-10)
    External research report
    Open Access
    An adaptive algorithm to compute the medial axis transform of 2D polygonal domains with arbitrary genus is presented. The algorithm is based on the refinement of a coarse medial axis transform by subdividing the domain ...
  • Computer (PC) assisted drawing of diagrams for forecasting soaring weather 

    Pérez Vidal, Lluís (1995-01-01)
    External research report
    Open Access
    To produce a weather forecast for soaring flight, meteorologists use, together with other data, a vertical sounding, involving (dry) temperature and wet-bulb temperature at several heights. This sampling results in a ...
  • Computing the medial axis transform of polygonal domains by tracing paths 

    Joan Arinyo, Robert; Pérez Vidal, Lluís; Vilaplana Pastó, Josep (1999-04)
    External research report
    Open Access
    A practical algorithm for computing the medial axis transform of 2D polygonal domains is presented. The algorithm computes the medial axis by tracing its paths. The medial axis is generated in the form of a graph where ...
  • Dibuix de patrons per a la talla de panys de vela assistit per computador 

    Pérez Vidal, Lluís; Robert Buti, José María (Universitat Politècnica de Barcelona. Centre de Càlcul, 1986-09)
    Article
    Open Access
    Els panys de veles de vaixell es tallen actualment de forma acusadament empírica. En aquest article presentem una primera aproximació al dibuix per a la talla de patrons amb ajuda de computador. Per aproximar les seccions ...
  • Fe d'errades 

    Pérez Vidal, Lluís; Robert, Josep M. (Universitat Politècnica de Barcelona. Centre de Càlcul, 1986-12)
    Review
    Open Access
    Al volum 10 nº. 3 hi mancaven les figures corresponents a l'article: "DIBUIX DE PATRONS PER A LA TALLA DE PANYS DE VELA ASSISTIT PER COMPUTADOR"
  • Generació adaptativa de contorns de nivell 

    Pérez Vidal, Lluís; Brunet Crosa, Pere (Universitat Politècnica de Barcelona. Centre de Càlcul, 1987)
    Article
    Open Access
    The production of drawings with surface contours starts from a set of given points defined by their coordiantes. Several analytical formulations are available to define interpolation formula. In this article a variations ...
  • Gestión del espacio libre en la memoria por actualización continua 

    Pérez Vidal, Lluís; Vila, R. (Universitat Politècnica de Barcelona. Centre de Càlcul, 1985-12)
    Article
    Open Access
    En la asignación dinámica de espacio en memoria se plantea el problema de la identificación y la compactación de los intervalos de memoria que ya no son utilizados por ningún proceso. Estos intervalos están dispersos entre ...
  • Informàtica ETSEIB. Resolució d'alguns problemes. Curs 1996-97 

    Pérez Vidal, Lluís; Pla García, Núria (1997-09)
    External research report
    Open Access
    This memorandum contains the detailed solution to four classroom problems of Elementary Computer Science. They are adequate for second semester students. The first problem is a simple stocks control application. It involves ...
  • Infromàtica Aplicada (3r quadrimestre) 

    Pérez Vidal, Lluís (Universitat Politècnica de Catalunya, 2002-01-21)
    Exam
    Restricted access to the UPC academic community
  • Open source environment to define constraints in route planning for GIS-T 

    Pérez Vidal, Lluís; Silveira, A. da Mota (2004-04)
    External research report
    Open Access
    Route planning for transportation systems is strongly related to shortest path algorithms, an optimization problem extensively studied in the literature. To find the shortest path in a network one usually assigns weights ...
  • Searching spatial sense in the ontological world: discovering spatial objects 

    Morocho Zurita, Villie; Pérez Vidal, Lluís; Saltor Soler, Félix Enrique (2004-05)
    External research report
    Open Access
    The search of semantic understanding in information systems has led us to take advantage from fields like Natural Language processing from the Artificial Intelligence. This is the case of ontologies which have been used ...
  • Semantic integration on spatial databases: SIT-SD prototype 

    Morocho, Villie; Pérez Vidal, Lluís; Saltor Soler, Félix Enrique (2003)
    Conference report
    Open Access
    Progress on data integration has come to the point that we must deal with the need of semantic integration. ln this work we present a prototype of an integration tool of information sources (Semantic lntegration Tool for ...
  • Smooth contour line construction with spline interpolation 

    Brunet Crosa, Pere; Pérez Vidal, Lluís (Universitat Politècnica de Barcelona. Centre de Càlcul, 1984-09)
    Article
    Open Access
    Contour maps are frequently used to represent three-dimensional surfaces from geographical applications or experimental results. In this paper two new algorithms for the generation and display of such contours are ...
  • Study of sidewalks in the UPC campuses of Barcelona through route planning techniques 

    Pérez Vidal, Lluís; Pereira, Hernane Borges de Barros (2000-07)
    External research report
    Open Access
    In this work we will present a study with respect to the sidewalks in the UPC campuses zone of Barcelona by ArcInfo GIS. We have done a specialized bibliographic reference work and an analysis of a first version of the ...
  • Study on behavioral impedance for route planning techniques from the pedestrian's perspective: Part I - Theoretical contextualization and taxonomy 

    Nogueira, Durval Lordelo; Pereira, Hernane Borges de Barros; Pérez Vidal, Lluís (2001-06)
    External research report
    Open Access
    The interest of researchers for analyzing of best routes and shortest paths allows a continuous technological advance in topological analysis techniques used in the geographic information systems for transportation. One ...
  • Study on behavioral impedance for route planning techniques from the pedestrian's perspective: some findings and considerations 

    Nogueira, Durval Lordelo; Pereira, Hernane Borges de Barros; Pérez Vidal, Lluís (2002-01)
    External research report
    Open Access
    The multi-disciplinary characteristics of transportation force a new design of geographic information systems, within which these characteristics are considered. In this context, geographic information systems for ...
  • Study on k-shortest paths with behavioral impedance domain from the intermodal public transportation system perspective 

    Pereira, Hernane Borges de Barros; Pérez Vidal, Lluís; Lozada, Eleazar G. Madrid (2003-07)
    External research report
    Open Access
    Behavioral impedance domain consists of a theory on route planning for pedestrians, within which constraint management is considered. The goal of this paper is to present the k-shortest path model using the behavioral ...