Now showing items 1925-1944 of 79656

  • A map characterizing the fuzzy points and columns of a T-indistinguishability operator 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2005-10)
    Article
    Open Access
    A new map (ΛE) between fuzzy subsets of a universe X endowed with a T-indistinguishability operator E is introduced. The main feature of ΛE is that it has the columns of E as fixed points, and thus it provides us with a ...
  • A margin adaptive scheduling algorithm for FBMC/OQAM systems 

    Caus López, Marius; Pérez Neira, Ana Isabel; Moretti, Marco; Kliks, Adrian (2014)
    Conference report
    Restricted access - publisher's policy
    This paper addresses the margin adaptive problem for the filter bank multicarrier (FBMC) modulation based on the offset QAM (OQAM), referred to as FBMC/OQAM. The analysis conducted in this paper reveals that due to the ...
  • A massive data processing approach for effective trustworthiness in online learning groups 

    Miguel, Jorge; Caballé Llobet, Santiago; Xhafa Xhafa, Fatos; Prieto, Josep (2015-06-10)
    Article
    Open Access
    This paper proposes a trustworthiness-based approach for the design of secure learning activities in online learning groups. Although computer-supported collaborative learning has been widely adopted in many educational ...
  • A materialidade da luz. A imaterialidade do sólido. Casa Guiette. Antuérpia 1926. 

    Lepori, Ana Paula de Oliveira (Associació d'idees. Centre d'Investigacions Estètiques, 2005)
    Article
    Open Access
  • A mathematical approach and review of the modeling of taxi services 

    Estrada Romeu, Miguel Ángel; Salanova Grau, Josep Maria (2012)
    Conference report
    Restricted access - publisher's policy
    This paper presents a mathematical model for the estimation of the key performance indicators of the taxi markets in urban areas. These key parameters are basically the demand and supply for taxi services, the waiting time ...
  • A Mathematical Autobiographity 

    Goldberg, Michael (Université du Quebéc à Montréal / Université du Quebéc à Montréal, 1980)
    Article
    Open Access
    Extrait de son autobiographie mathématique. “Mes recherches mathématiques proviennent en partie de l’intérèt que je Porte aux problèmes de dissection. J’ai montré, par exemple, comment découper un pentagone régulier en six ...
  • A mathematical framework for structural control integration 

    Rossell Garriga, Josep Maria; Rodellar Benedé, José; Palacios Quiñonero, Francisco; Rubió Massegú, Josep (Trans Tech Publications, 2012)
    Conference report
    Open Access
    In this paper, some control strategies to design decentralized controllers are developed and discussed. These strategies are based on the Inclusion Principle, a very useful mathematical framework to obtain decentralized ...
  • A mathematical model for dynamic memory networks 

    Fàbrega Canudas, José; Fiol Mora, Miquel Àngel; Serra Albó, Oriol; Andrés Yebra, José Luis (Iniciativa Digital Politècnica, 2011)
    Conference report
    Open Access
    The aim of this paper is to bring together the work done several years ago by M.A. Fiol and the other authors to formulate a quite general mathematical model for a kind of permutation networks known as dynamic memories. A ...
  • A mathematical model of refinery operations characterised by complete horizontal integration of subsystems from purchase to product distribution 

    Alabi, Adebayo Adejare; Castro Pérez, Jordi (2009)
    Article
    Restricted access - publisher's policy
    Refinery economics are extremely complex and involve massive amounts of operational data and decision-making processes; therefore, most refinery planners model and solve each sub-problem sequentially and independently. ...
  • A Mathematical model of the spread of two viral sub-types on a Plant Leaf (Numerical Simulation) 

    Ramchand Lalwani, Nitin (Universitat Politècnica de Catalunya, 2015-06)
    Master thesis
    Restricted access - author's decision
    Whilst in humans free virus particles and host cells are assumed to be homogenously mixed, in plants, the spatial component is a key factor. The natural proliferation of the virus through a plant is known to happen from a ...
  • A mathematical model to study railway track dynamics for the prediction of vibration levels generated by rail vehicles 

    Otero Yugat, Jesús; Martínez Miralles, Jordi Ramon; Santos López, M. Antonia de los; Cardona Foix, Salvador (2012-01)
    Article
    Open Access
    This article presents a mathematical model aimed at predicting wheel–rail contact vibration force arising from wheel profile irregularities. Prediction of vibrations caused by a passing train is a basic factor in environmental ...
  • A mathematical programming approach for different scenarios of bilateral bartering 

    Nasini, Stefano; Castro, Jordi; Fonseca, Pau (Institut d'Estadística de Catalunya, 2015-06)
    Article
    Open Access
    The analysis of markets with indivisible goods and fixed exogenous prices has played an important role in economic models, especially in relation to wage rigidity and unemployment. This paper provides a novel mathematical ...
  • A mathematical programming approach for different scenarios of bilateral bartering 

    Nasini, Stefano; Castro Pérez, Jordi; Fonseca Casas, Pau (Institut d'Estadística de Catalunya, 2015-01-01)
    Article
    Open Access
    The analysis of markets with indivisible goods and fixed exogenous prices has played an important role in economic models, especially in relation to wage rigidity and unemployment. This paper provides a novel mathematical ...
  • A matrix derivation of a representation theorem for (trAp)1/p 

    Neudecker, Heinz (Universitat Politècnica de Catalunya. Centre de Càlcul, 1989)
    Article
    Open Access
    A matrix derivation of a well-known representation theorem for (tr Ap)1/p is given, which is the solution of a restricted maximization problem. The paper further gives a solution of the corresponding restricted minimization ...
  • A matrix function useful in the estimation of linear continuous-time models. 

    Neudecker, Heinz (Institut d'Estadística de Catalunya, 2006)
    Article
    Open Access
    In a recent publication Chen & Zadrozny (2001) derive some equations for efficiently computing eA and ∇ eA, its derivative. They employ an expression due to Bellman (1960), Snider (1964) and Wilcox (1967) for the differential ...
  • A Max coverage formulation for information dissemination in vehicular networks 

    Trullols Cruces, Óscar; Barceló Ordinas, José María; Fiore, Marco; Casetti, Claudio; Chiasserini, Carla-Fabiana (IEEE Press. Institute of Electrical and Electronics Engineers, 2009)
    Conference lecture
    Open Access
    We consider that a given number of Dissemination Points (DPs) have to be deployed for disseminating information to vehicles travelling in an urban area. We formulate our problem as a Maximum Coverage Problem (MCP) so as ...
  • A maximum approach for robust MIMO design: combining OSTBC and beamforming with minimum transmission power requirements 

    Pascual Iserte, Antonio; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2004)
    Conference report
    Open Access
    In this paper we address the problem of the design of a transmitter in a Multi-Input-Multi-Output (MIMO) space diversity system. We consider a design which is robust to errors in the channel estimate available at the ...
  • A maximum likelihood analysis of the RVoG model for forestry studies in polarimetric SAR interferometry 

    López Martínez, Carlos; Alonso González, Alberto (European Space Agency (ESA), 2013)
    Conference report
    Restricted access - publisher's policy
    This work analyses the validity of the RVoG model as- sumption in case of PolInSAR data in forestry analy- sis. In order to assure that the interferometric coherence describes a line, as imposed by the RVoG model, ...
  • A mean field equation on a torus: one-dimensional symmetry of solutions 

    Cabré Vilagut, Xavier; Lucia D'Agostino, Marcello; Sanchón Rodellar, Manuel (2003)
    Article
    Open Access
    We study the equation $$-\Delta u=\lambda\left(\frac{e^u}{\int_\oep e^u}- \frac{1}{|\oep|}\right)\quad \text{in }\oep$$ for $u\in E$, where $E = \{ u \in H^1(\oep): u \hbox{ is doubly periodic}, \int_{\oep} u = 0 \}$ and ...
  • A measurement method to discriminate aircraft fly-over noise 

    Genesca Francitorra, Meritxell; Romeu Garbí, Jordi; Pàmies Gómez, Teresa (2010)
    Conference report
    Restricted access - publisher's policy
    Currently aircraft noise monitoring systems use a mesh of single microphones distributed around an airport to continuously sample the noise level. This fact requires a manual process of aircraft noise event detection and ...