Now showing items 1-20 of 92

    • 3D structure of a Brucella melitensis porin: molecular modelling in lipid membranes 

      Lopes Rodrigues, Maximilien; Zanuy Gomara, David; Alemán Llansó, Carlos; Michaux, Catherine Anne Gisèle; Perpète, Eric A. (2018-01-01)
      Article
      Open Access
      Brucella melitensis is a pathogenic bacterium responsible for brucellosis in mammals and humans. Its outer membrane proteins (Omp) control the diffusion of solutes through the membrane, and they consequently have a crucial ...
    • A distributed, parallel, and generic virtual network embedding framework 

      Beck, Michael Till; Fischer, Andreas; de Meer, Hermann; Botero Vega, Juan Felipe; Hesselbach Serra, Xavier (2013)
      Conference report
      Restricted access - publisher's policy
      One of the main challenges of network virtualization is the mapping of virtual network demands to physical network resources, commonly known as the virtual network embedding (VNE) problem. This paper introduces DPVNE, a ...
    • A geometric approach to dense Cayley digraphs of finite Abelian groups 

      Aguiló Gost, Francisco de Asis L.; Fiol Mora, Miquel Àngel; Pérez Mansilla, Sonia (2016)
      Article
      Open Access
      We give a method for constructing infinite families of dense (or eventually likely dense) Cayley digraphs of finite Abelian groups. The diameter of the digraphs is obtained by means of the related minimum distance diagrams. ...
    • A multilevel active-clamped converter topology—Operating principle 

      Busquets Monge, Sergio; Nicolás Apruzzese, Joan (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-09)
      Article
      Restricted access - publisher's policy
      This paper presents a novel multilevel activeclamped converter topology, which is an extension to m levels of the three-level active neutral-point-clamped topology. The operating principle is established through the ...
    • A new method for ionospheric tomography and its assessment by ionosonde electron density, GPS TEC, and single-frequency PPP 

      Prol, Fabricio dos Santos; Camargo, Paulo de Oliveira; Hernández Pajares, Manuel; Honorato Muella, Marcio Tadeu de Assis (Institute of Electrical and Electronics Engineers (IEEE), 2019-01-05)
      Article
      Open Access
      A new tomographic method was developed with the main goal of mapping the ionosphere in the region of Brazil. The ionospheric background was estimated based on ionosonde and radio-occultation measurements to overcome the ...
    • A note on the periodic orbits and topological entropy of graph maps 

      Alseda Soler, Lluís; Juher, D.; Mumbrú i Rodriguez, Pere (2000)
      Article
      Open Access
      This paper deals with the relationship between the periodic orbits of continuous maps on graphs and the topological entropy of the map. We show that the topological entropy of a graph map can be approximated by the entropy ...
    • A simheuristic algorithm for service placement in community networks 

      Panadero Martínez, Javier; Calvet Liñán, Laura; Bayliss, Christopher; Marques Puig, Joan Manuel; Selimi, Mennan; Freitag, Fèlix (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Conference report
      Open Access
      The growing demand for network connectivity has boosted the number of community networks (CNs). CNs are decentralized and self-organized communication networks owned and managed at the edge by volunteers. Due to the ...
    • A simulation system for WSNs as a digital eco-system approach considering goodput metric 

      Barolli, Leonard; Yang, Tao; Mino, Gjergji; Durresi, Arjan; Xhafa Xhafa, Fatos (Institute of Electrical and Electronics Engineers (IEEE), 2010)
      Conference report
      Open Access
      Sensor networks are a sensing, computing and communication infrastructure that are able to observe and respond to phenomena in the natural environment and in our physical and cyber infrastructure. The sensors themselves ...
    • Active redundant submodule configuration in modular multilevel converters 

      Konstantinou, Georgios; Pou Félix, Josep; Ceballos Recio, Salvador; Agelidis, Vassilios (2013-09)
      Article
      Restricted access - publisher's policy
      The modular multilevel converter (MMC) is based on the cascaded connection of identical submodules (SMs) enabling additional redundancies. This paper proposes the configuration of the MMC topology with redundant SMs and ...
    • Analysis and simulation of optical switches for intra-datacenter networks 

      Adetupe Osemwengie, Odiri (Universitat Politècnica de Catalunya, 2018-06)
      Bachelor thesis
      Open Access
      Este proyecto consiste en realizar un estudio de factibilidad para las interconexiones dentro de un centro de datos. Hay tantos diseños de arquitectura de una red de centro de datos (DCN), que es uno de los más básicos y ...
    • Aplicació del mètode les asímptotes movibles (MMA) 

      Bach Santacana, Elisabet (Universitat Politècnica de Catalunya, 2013-10-28)
      Bachelor thesis
      Open Access
      Application of the Method of Moving Asymptotes The Method of Moving Asymptotes (MMA) has been revealed as a useful tool for solving approaches that appear in the field of topological optimization. In structural problems, ...
    • Are space-filling curves efficient small antennas? 

      González Arbesú, José María; Blanch Boris, Sebastián; Romeu Robert, Jordi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC., 2003-09-30)
      Article
      Open Access
      The performance of space-filling curves used as small antennas is evaluated in terms of quality factor and radiation efficiency. The influence of their topology is also considered. Although the potential use of these ...
    • Axiomatic definition of the topological entropy on the interval 

      Alseda Soler, Lluís; Kolyada, Sergi; Llibre Saló, Jaume; Snoha, Lubomír (2000)
      Article
      Open Access
      Summary. The aim of this paper is to give an axiomatic definition of the topological entropy for continuous interval maps and, in such a way, to shed some more light on the importance of the different properties of the ...
    • Bandwidth-Enhancement gm-C Filter with Independent wo and Q Tuning Mechanisms in Both Topology and Control Loops 

      Martínez García, Herminio; Vidal López, Eva María; Poveda López, Alberto; Guinjoan Gispert, Francisco (2010-06)
      Conference report
      Open Access
      This paper deals with the proposal of a new topology for a gm-C continuous time filter which allows the adjustment and tuning of its characteristic parameters (ωO and Q) in an independent way (without cross-tuning), thereby ...
    • Beyond the star of stars: An introduction to multihop and mesh for LoRa and LoRaWAN 

      Pueyo Centelles, Roger; Freitag, Fèlix; Meseguer Pallarès, Roc; Navarro Moldes, Leandro (2021-04)
      Article
      Open Access
      LoRa has emerged in recent years as a wireless technology providing long-range communication for low-power Internet-of-Things (IoT) devices. The LoRaWAN architecture adds the medium access control (MAC) and application ...
    • Big data analytics for the virtual network topology reconfiguration use case 

      Gifre Renom, Lluís; Morales Alcaide, Fernando; Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Conference report
      Restricted access - publisher's policy
      ABNO's OAM Handler is extended with big data analytics capabilities to anticipate traffic changes in volume and direction. Predicted traffic is used to trigger virtual network topology re-optimization. When the virtual ...
    • Bounds of the sum of edge lengths in linear arrangements of trees 

      Ferrer Cancho, Ramon; Gómez Rodríguez, Carlos; Esteban Ángeles, Juan Luis (Institute of Physics (IOP), 2021-02-11)
      Article
      Restricted access - publisher's policy
      A fundamental problem in network science is the normalization of the topological or physical distance between vertices, which requires understanding the range of variation of the unnormalized distances. Here we investigate ...
    • Chromatic monitoring of gear mechanical degradation based on acoustic emission 

      Delgado Prieto, Miquel; Zurita Millán, Daniel (Institute of Electrical and Electronics Engineers (IEEE), 2017-11-01)
      Article
      Open Access
      This paper presents a methodology for the feature estimation of a new fault indicator focused on detecting gear mechanical degradation under different operating conditions. Preprocessing of acoustic emission signal is ...
    • Commensurations and metric properties of Houghton's groups 

      Burillo Puig, José; Cleary, Sean; Martino, Armando; Röver, Claas E. (2016-12-01)
      Article
      Open Access
      We describe the automorphism groups and the abstract commensurators of Houghton’s groups. Then we give sharp estimates for the word metric of these groups and deduce that the commensurators embed into the corresponding ...
    • Comparative study of goodness of topology optimization software on additive manufactured parts 

      Pallarès Vendrell, Pau (Universitat Politècnica de Catalunya, 2020-07-15)
      Master thesis
      Open Access
      La introducció de la fabricació additiva (AM) ha eliminat la majoria de les restriccions de fabricació que impliquen els mètodes tradicionals. Per això, l'interès per les tècniques de disseny basades en algoritmes ...