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Ara es mostren els items 1-14 de 14

    • A meta-analysis on classification model performance in real-world datasets: an exploratory view 

      Gómez Guillen, David; Rojas Espinosa, Alfonso (2018-02-22)
      Article
      Accés restringit per política de l'editorial
      The No Free Lunch (NFL) Theorem imposes a theoretical restriction on optimization algorithms and their equal average performance on different problems, under some particular assumptions. Nevertheless, when brought into ...

    • An empirical overview of the No Free Lunch Theorem and its effect on Real-World Machine Learning Classification 

      Gomez Guillen, David; Rojas Espinosa, Alfonso (2016-01-01)
      Article
      Accés obert
      A sizable amount of research has been done to improve the mechanisms for knowledge extraction such as machine learning classification or regression. Quite unintuitively, the no free lunch (NFL) theorem states that all ...

    • Análisis del protocolo IEEE 802.11b en un entorno celular 

      López Aguilera, M. Elena; Casademont Serra, Jordi; Rojas Espinosa, Alfonso (Universidad de Las Palmas de Gran Canaria, Servicio de Publicaciones, 2003)
      Text en actes de congrés
      Accés obert
      In this paper we present an analysis of the protocol IEEE 802.11b in different environments. Its performance in an indoor environment is evaluated, in terms of throughput and transmission delay, and the influence of the ...

    • Enhancement proposal for WLAN IEEE 802.11e: desynchronization of its working procedure 

      López Aguilera, M. Elena; Casademont Serra, Jordi; Cotrina Navau, Josep; Rojas Espinosa, Alfonso (Institute of Electrical and Electronics Engineers, 2005)
      Text en actes de congrés
      Accés obert
      Up to the present, several studies have been performed in order to provide prioritization of stations or classes of service for WLAN IEEE 802.11. The IEEE 802.11e draft specification aims to extend the original IEEE 802.11 ...

    • Examen Final 

      Barba Martí, Antonio; Remondo Bueno, David; Rojas Espinosa, Alfonso (Universitat Politècnica de Catalunya, 2013-06-19)
      Examen
      Accés restringit a la comunitat UPC

    • Exercicis tema 1. Xarxes de telecomunicació i els seus models matemàtics 

      Calveras Augé, Anna M.; Casademont Serra, Jordi; Esparza Martín, Óscar; Hesselbach Serra, Xavier; Muñoz Tapia, José Luis; Paradells Aspas, Josep; Pegueroles Vallés, Josep R.; Rojas Espinosa, Alfonso (Universitat Politècnica de Catalunya, 2010-03)
      Problema, exercici
      Accés obert

    • MALLBA: a library of skeletons for combinatorial optimisation 

      Alba, E; Almeida, F; Blesa Aguilera, Maria Josep; Cabeza, J; Cotta, C; Díaz, M; Dorta, I; Gabarró Vallès, Joaquim; León, C; Luna Garcia, Jesus; Moreno Boronat, Lidia Ana; Pablos, C; Petit Silvestre, Jordi; Rojas Espinosa, Alfonso; Xhafa Xhafa, Fatos (2002-02)
      Report de recerca
      Accés obert
      The MALLBA project tackles the resolution of combinatorial optimization problems using algorithmic skeletons implemented in C++. MALLBA offers three families of generic resolution methods: exact, heuristic and hybrid. ...

    • Performance enhancement of outdoor IEEE 802.11 cellular networks 

      López Aguilera, M. Elena; Casademont Serra, Jordi; Rojas Espinosa, Alfonso; Cotrina Navau, Josep (ACTA Press, 2005-07)
      Text en actes de congrés
      Accés obert
      Most studies about the performance of IEEE 802.11 are limited to a single cell environment. Nevertheless, the idea of designing an outdoor cellular network based on WLAN IEEE 802.11 results very attractive, due to the ...

    • Performance enhancement of WLAN IEEE 802.11 for asymmetric traffic 

      López Aguilera, M. Elena; Casademont Serra, Jordi; Cotrina Navau, Josep; Rojas Espinosa, Alfonso (Institute of Electrical and Electronics Engineers, 2005)
      Text en actes de congrés
      Accés obert
      Most studies about the performance of IEEE 802.11 consider scenarios of ad-hoc topology and networks where all stations have the same traffic load (symmetric traffic conditions). This paper presents a study of performance ...

    • Problemes Tema 2 (MAC i LLC) 

      Aguilar Igartua, Mónica; Alins Delgado, Juan José; Altés Bosch, Jorge; Barceló Arroyo, Francisco; Calveras Augé, Anna M.; Casademont Serra, Jordi; Cruz Llopis, Luis Javier de la; Esparza Martín, Óscar; Forné Muñoz, Jorge; Hesselbach Serra, Xavier; Martín Escalona, Israel; Martín Faus, Isabel Victoria; Mata Diaz, Jorge; Muñoz Tapia, José Luis; Pallarès Segarra, Esteve; Paradells Aspas, Josep; Pegueroles Vallés, Josep R.; Rojas Espinosa, Alfonso; Serrat Fernández, Juan; Soriano Ibáñez, Miguel; Postigo Boix, Marcos; Casademont Serra, Jordi (Universitat Politècnica de Catalunya, 2023-04-08)
      Problema, exercici
      Accés obert

    • Problemes Tema 3 (LAN i WLAN) 

      Aguilar Igartua, Mónica; Alins Delgado, Juan José; Altés Bosch, Jorge; Barceló Arroyo, Francisco; Calveras Augé, Anna M.; Casademont Serra, Jordi; Cruz Llopis, Luis Javier de la; Esparza Martín, Óscar; Forné Muñoz, Jorge; Hesselbach Serra, Xavier; Martín Escalona, Israel; Mata Diaz, Jorge; Muñoz Tapia, José Luis; Pallarès Segarra, Esteve; Paradells Aspas, Josep; Pegueroles Vallés, Josep R.; Rojas Espinosa, Alfonso; Serrat Fernández, Juan; Soriano Ibáñez, Miguel; Postigo Boix, Marcos; Casademont Serra, Jordi; Martín Faus, Isabel Victoria (Universitat Politècnica de Catalunya, 2023-04-08)
      Problema, exercici
      Accés obert

    • Simulation of cell signalling communications using event-driven algorithms 

      Huertas Gonzalez, Daniel; Rojas Espinosa, Alfonso (2014)
      Text en actes de congrés
      Accés obert
      In this paper we present two implementations of event-driven algorithms for simulating molecular dynamics using the Omnet++ Simulation Framework and its Future Event Set (FES) implementation. The first one uses a cell-linked ...

    • Transmisión de datos : problemas resueltos 

      Aguilar Igartua, Mónica; Forné Muñoz, Jorge; Mata Diaz, Jorge; Rico Novella, Francisco José; Rojas Espinosa, Alfonso; Soriano Ibáñez, Miguel (Iniciativa Digital Politècnica, 2010)
      Llibre
      Accés obert
      Los profesores de la asignatura Transmisión de Datos, impartida en la UPC, hemos elaborado este libro de problemas resueltos representativos de la misma. El libro se estructura en tres temas: codificación de fuente, ...

    • Wireless technology applied to GIS 

      Casademont Serra, Jordi; López Aguilera, M. Elena; Paradells Aspas, Josep; Rojas Espinosa, Alfonso; Calveras Augé, Anna M.; Barceló Arroyo, Francisco; Cotrina Navau, Josep (Elsevier, 2004-07)
      Article
      Accés restringit per política de l'editorial
      At present, there is a growing interest in wireless applications, due to the fact that the technology begins to support them at reasonable costs. In this paper, we present the technology currently available for use in ...