Now showing items 21-40 of 93

    • Completeness properties of locally quasi-convex groups 

      Bruguera Padró, Maria Montserrat; Chasco Ugarte, Maria Jesús; Martín Peinador, Elena; Tarieladze, V. I. (Vazha Izemovich) (1999)
      Article
      Open Access
      It is natural to extend the Grothendieck Theorem on completeness, valid for locally convex topological vector spaces, to abelian topological groups. The adequate framework to do it seems to be the class of locally ...
    • Computing the topology of planar semi-algebraic sets 

      Cucker Farkas, Juan Felipe; Rosselló Llompart, Francesc A. (1990)
      External research report
      Open Access
      In this note we give a new algorithm for computing the topological type of a planar semi-algebraic set that run in time О(m super 4 n super 19 (log n) super 3) where M is the number of polynomials defining the set and n ...
    • Connectivity-preserving transformations of binary images 

      Bose, Prosenjit; Dujmovic, Vida; Hurtado Díaz, Fernando Alfredo; Morin, Pat (2009-10)
      Article
      Open Access
      A binary image $\emph{I}$ is $B_a$, $W_b$-connected, where $\emph{a,b}$ ∊ {4,8}, if its foreground is $\emph{a}$-connected and its background is $\emph{b}$-connected. We consider a local modification of a $B_a$, $W_b$-connected ...
    • Contention-based nonminimal adaptive routing in high-radix networks 

      Fuentes Sáez, Pablo; Vallejo, Enrique; García, Marina; Beivide Palacio, Julio Ramón; Rodríguez, Germán; Minkenberg, Cyriel; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference report
      Open Access
      Adaptive routing is an efficient congestion avoidance mechanism for modern Datacenter and HPC networks. Congestion detection traditionally relies on the occupancy of the router queues. However, this approach can hinder ...
    • Detecting topology through dynamics in interacting fermionic wires 

      Haller, Andreas; Massignan, Pietro Alberto; Rizzi, Mateo (American Physical Society, 2020-08-05)
      Article
      Open Access
      Probing the topological invariants of interacting systems stands as a grand and open challenge. Here we describe a dynamical method to characterize 1D chiral models, based on the direct observation of time-evolving bulk ...
    • Development and experimentation towards a multicast-enabled Internet 

      Careglio, Davide; Papadimitriou, Dimitri; Agraz Bujan, Fernando; Sahhaf, S; Perelló Muntan, Jordi; Tavernier, W; Spadaro, Salvatore; Colle, Didier (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      In this paper, we report our development experience and experimentation studies of two multicast routing schemes for the Internet, namely, PIM-SSM and GCMR. We detail their implementation over the Quagga open ...
    • Dynamic compact multicast routing on power-law graphs 

      Pedroso, Pedro; Papadimitriou, Dimitri; Careglio, Davide (IEEE, 2011)
      Conference report
      Restricted access - publisher's policy
      Compact routing schemes address the fundamental tradeoff between the memory space required to store the routing table entries and the length of the routing paths that these schemes produce. This paper introduces the first ...
    • Dynamic topology discovery in SDN-enabled transparent optical networks 

      Montero, Rafael; Agraz Bujan, Fernando; Pagès Cruz, Albert; Perelló Muntan, Jordi; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - publisher's policy
      Optical technologies play nowadays a crucial role in different network scenarios (e.g., data centres, metro and access networks), mainly due to their support for higher bandwidth and scalability in comparison to electronic-based ...
    • Efficient encoding schemes for symbolic analysis of Petri nets 

      Pastor Llorens, Enric; Cortadella, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 1998)
      Conference report
      Open Access
      Petri nets are a graph-based formalism appropriate to model concurrent systems such as asynchronous circuits or network protocols. Symbolic techniques based on Binary Decision Diagrams (BDDs) have emerged as one of the ...
    • Efficient routing mechanisms for Dragonfly networks 

      García, Marina; Vallejo, Enrique; Beivide Palacio, Julio Ramón; Odriozola, Miguel; Valero Cortés, Mateo (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference lecture
      Open Access
      High-radix hierarchical networks are cost-effective topologies for large scale computers. In such networks, routers are organized in super nodes, with local and global interconnections. These networks, known as Dragonflies, ...
    • Estructures matemàtiques equivalents: els espais recobridors i els G-conjunts 

      Barrios Jurado, Marina (Universitat Politècnica de Catalunya, 2014-01)
      Master thesis (pre-Bologna period)
      Restricted access - author's decision
      En aquest treball, a través de la Teoria de Categories, ens preguntem en què consisteix que dues estructures matemàtiques siguin equivalents i per quins motius aquesta definició és més encertada que la definició d'isomorfisme. ...
    • Estudi de la topologia de la xarxa de navegació aèria 

      Lleal Fontàs, Xavier (Universitat Politècnica de Catalunya, 2015-10-09)
      Bachelor thesis
      Restricted access - author's decision
      En aquest estudi s'analitzaran les xarxes de navegació aèria per veure quina estructura tenen, zones més centrals, zones amb més densitat de tràfic, etc. S'utilitzaran algoritmes de teoria de xarxes per analitzar les dades ...
    • Estudio comparativo de la optimización topológica numérica y experimental 

      Olives Juan, Sergi (Universitat Politècnica de Catalunya, 2021-11-01)
      Bachelor thesis
      Restricted access - author's decision
      En primer lugar, se ha hecho un poco de investigación sobre literatura dedicada a la optimización topológica con el fin de obtener una base teórica para poder realizar el proyecto. También se ha llevado a cabo una investigación ...
    • Experimental assessment of bulk path restoration in multi-layer networks using PCE-based global concurrent optimization 

      Castro Casales, Alberto; Martínez, Ricardo; Casellas Regi, Ramón; Velasco Esteban, Luis Domingo; Muñoz, Raúl; Vilalta, Ricard; Comellas Colomé, Jaume (2014-01-01)
      Article
      Restricted access - publisher's policy
      Generalized multi-protocol label switching-based multi-layer networks (MLN) combining packet and optical switching lead to jointly leverage intrinsic per-layer benefits such as statistical multiplexing and huge transport ...
    • Finite element analysis of ball burnishing on ball-end milled surfaces considering their original topology and residual stress 

      Amini, Cyrus; Jerez Mesa, Ramón; Travieso Rodriguez, Jose Antonio; Llumà Fuentes, Jordi; Estévez Urra, Aida (Multidisciplinary Digital Publishing Institute (MDPI), 2020-05-14)
      Article
      Open Access
      Ball burnishing is a superfinishing operation whose objective is the enhancement of surface integrity of previously machined surfaces, hence its appropriateness to complement chip removal processes at the end of a production ...
    • From a topological approach for classification to KNN 

      Baltes Staubli, Simon (Universitat Politècnica de Catalunya, 2020-10-29)
      Master thesis
      Open Access
      This work proposes a possible generalization of k-nearest neighbors rule (kNN) where the impact of a point goes beyond the exact location. The decision criteria does not only depend on the distances to points but also ...
    • Geometria i grups 

      Ferrer Sánchez, Jordi (Universitat Politècnica de Catalunya, 2015-07)
      Bachelor thesis
      Open Access
      En aquest treball ens centrarem en l'estudi elemental de la geometria de les superfícies, entenent per elemental les eines usades a l'hora de dur a terme aquest estudi. De fet, emprant eines tan avançades com pot ser la ...
    • Global controllability tests for geometric hybrid control systems 

      Barberó Liñan, María; Cortés, Jorge; Martín de Diego, David; Martínez, Sonia; Muñoz Lecanda, Miguel Carlos (2020-11-01)
      Article
      Restricted access - publisher's policy
      This paper introduces a novel geometric framework to define and study hybrid systems. We exploit the geometry and topology of the set of jump points, where the instantaneous change of dynamics takes place, in order to gain ...
    • Impact of mobile sink for wireless sensor networks considering different radio models and performance metrics 

      Yang, Tao; Mino, Gjergji; Barolli, Leonard; Xhafa Xhafa, Fatos; Durresi, Arjan (Institute of Electrical and Electronics Engineers (IEEE), 2010)
      Conference report
      Open Access
      In this work, we investigate how WSN performs in the case when sink node moves using different radio models and metrics. We consider routing efficiency, delay and number of received packet metrics to evaluate the performance ...
    • Impact of mobile sink for wireless sensor networks considering goodput and routing efficiency metrics 

      Yang, Tao; Mino, Gjergji; Barolli, Leonard; 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 ...