Now showing items 1-20 of 119

  • A canonical reduced form for singular time invariant linear systems 

    García Planas, María Isabel; Díaz, Adolfo (2009-09)
    Conference report
    Open Access
    We consider quadruples of matrices (E; A;B;C), representing singular linear time invariant systems in the form Ex_ (t) = Ax + Bu y = Cx ¾ (1) with E;A 2 Mp£n(C), B 2 Mp£m(C) and C 2 Mq£n(C) under proportional and ...
  • Accelerated direct solution of the MoM linear system using block compression and nested factorization 

    Heldring, Alexander; Rius Casals, Juan Manuel (IEEE, 2011)
    Conference report
    Restricted access - publisher's policy
    A comparison is presented between different algorithms for direct (non-iterative) accelerated solution of the Method of Moments. The alternatives are common block LU factorization and Compressed Block Decomposition (CBD), ...
  • A construction of small regular bipartite graphs of girth 8 

    Balbuena Martínez, Maria Camino Teófila (2009-01)
    Article
    Open Access
    Let q be a prime a power and k an integer such that 3 ≤ k ≤ q. In this paper we present a method using Latin squares to construct adjacency matrices of k-regular bipartite graphs of girth 8 on $2(kq^{2}-q)$ vertices. Some ...
  • A differential approach for bounding the index of graphs under perturbations 

    Dalfó Simó, Cristina; Fiol Mora, Miquel Àngel; Garriga Valle, Ernest (2011-03)
    External research report
    Open Access
  • Adjacency matrices of polarity graphs and of other C4-free graphs of large size 

    Abreu, M.; Balbuena Martínez, Maria Camino Teófila; Labbate, D. (2010)
    Article
    Restricted access - publisher's policy
    In this paper we give a method for obtaining the adjacency matrix of a simple polarity graph $G_q$ from a projective plane PG(2,q), where q is a prime power. Denote by ex(n;C₄) the maximum number of edges of a graph on n ...
  • A general approach for computing residues of partial-fraction expansion of transfer matrices 

    García Planas, María Isabel; Domínguez García, José Luís (2013-07)
    Article
    Open Access
    This paper deals with the description of a general method for calculating the residues of a linear system. Considering, physical models, it is well-assumed that the system described only presents simple eigenvalues, or at ...
  • Ajuste temporal de matrices OD basado en una aproximación del gradiente 

    Bullejos González, Manuel (Universitat Politècnica de Catalunya, 2013-02)
    Master thesis
    Open Access
    Modelar la demanda del transporte en función de una matriz Origen-Destino (OD) es un aspecto clave en casi todos los modelos de transporte. Cuando realizamos una planificación estratégica del transporte hacemos uso de ...
  • Alternative tests for functional and pointwise output-controllability of linear time-invariant systems 

    García Planas, María Isabel; Domínguez García, José Luís (2013)
    Article
    Open Access
    This paper deals with the description of a new method for calculating the functional output-controllability. It is computed by means of the rank of a certain constant matrix which can be associated to the system. Moreover, ...
  • An iterative linear matrix inequality controller-design strategy for H-infinity structural vibration control 

    Palacios Quiñonero, Francisco; Rubió Massegú, Josep; Rossell Garriga, Josep Maria; Reza Karimi, Hamid (CRC Press/Balkema, 2019)
    Conference report
    Restricted access - publisher's policy
    In this paper, we present a novel Iterative Linear Inequality (ILMI) strategy for controller design that makes it possible to compute suboptimal H-infinity static output-feedback (SOF) controllers with high-performance ...
  • An LMI approach to H_ synchronization of second-order neutral master-slave systems 

    Reza Karimi, Hamid; Zapateiro, Mauricio; Luo, Ningsu; Rossell Garriga, Josep Maria (American Automatic Control Council, 2009-06-10)
    Conference report
    Open Access
    The H_ synchronization problem of the master and slave structure of a second-order neutral master-slave systems with time-varying delays is presented in this paper. Delaydependent sufficient conditions for the design of a ...
  • Aplicaciones de la Teoría de Matrices en Matemática Discreta 

    Fiol Mora, Miquel Àngel (1999-07)
    Working paper
    Open Access
    Se describen algunas aplicaciones de la teoría de matrices a diversos temas pertenecientes al ámbito de la matem\'atica discreta.
  • Approaching dual quaternions from matrix algebra 

    Thomas, Federico (2014)
    Article
    Open Access
    Dual quaternions give a neat and succinct way to encapsulate both translations and rotations into a unified representation that can easily be concatenated and interpolated. Unfortunately, the combination of quaternions and ...
  • A solution to the tennis ball problem 

    Mier Vinué, Anna de; Noy Serrano, Marcos (2005)
    Article
    Open Access
    We present a complete solution to the so-called tennis ball problem, which is equivalent to counting the number of lattice paths in the plane that use North and East steps and lie between certain boundaries. The solution ...
  • A Stein matrix equation related to transfer matrix of linear dynamic systems over commutative rings 

    García Planas, María Isabel; Lopez Cabeceira, Montserrat (Editorial de la Universitat Politècnica de València (UPV), 2010)
    Conference report
    Open Access
    Este trabajo está inmerso en el campo de la Teoría de Control sobre un anillo conmutativo R con elemento unidad. Dado un sistema dinámico lineal invariante en el tiempo representado por x+(t) = Ax(t) + Bu(t) sobre R, ...
  • A study of QR decomposition and Kalman filter implementations 

    Fuertes Roncero, David (Universitat Politècnica de Catalunya, 2014-09)
    Master thesis (pre-Bologna period)
    Open Access
    Covenantee:  Kungliga Tekniska högskolan
    [ANGLÈS] With the rapid development of new technologies during the last decades, the demand of complex algorithms to work in real-time applications has increased considerably. To achieve the real time expectations and to ...
  • A Volume Visualization Algorithm using a coherent Extended Weight Matrix 

    Tost Pardell, Daniela; Puig Puig, Anna; Navazo Álvaro, Isabel (1995-01)
    Article
    Restricted access - publisher's policy
    Direct cell-to-cell volume visualization algorithms, also called projective rendering methods, present the advantage of allowing semi-transparencies and, additionally, as they project all the samples, they avoid the ...
  • Brunovsky local form of a holomorphic family of pair of matrices 

    Ferrer Llop, Josep; García Planas, María Isabel; Puerta Sales, Ferran (Elsevier, 1997)
    Article
    Restricted access - publisher's policy
    Following Arnold’s techniques, we obtain a local canonical form of a holomorphic family of pairs of matrices ( A( A), B(h)) ac t e d on by the state feedback group. We obtain an explicit formula to compute the dimension ...
  • Cálculo de la inversa de una matriz de Jacobi 

    Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José (Universidad de Cádiz, 2017)
    Conference report
    Restricted access - publisher's policy
    En este trabajo aportamos las condiciones necesarias y suficientes para la invertibilidad de las matrices de Jacobi y calculamos explícitamente su inversa. Las técnicas que utilizamos están relacionadas con la soluciones ...
  • Combinatorial recurrences and linear difference equations 

    Jiménez Jiménez, María José; Encinas Bachiller, Andrés Marcos (2016-10-17)
    Article
    Open Access
    In this work we introduce the triangular arrays of depth greater than 1 given by linear recurrences, that generalize some well known recurrences that appear in enumerative combinatorics. In particular, we focussed on ...
  • Combinatorial recurrences and linear difference equations 

    Jiménez Jiménez, María José; Encinas Bachiller, Andrés Marcos (2016)
    Conference report
    Restricted access - publisher's policy
    In this work we introduce the triangular arrays of depth greater than 1 given by linear recurrences, that generalize some well-known recurrences that appear in enumerative combinatorics. In particular, we focussed on ...