Browsing Τμήμα Μαθηματικών και Στατιστικής / Department of Mathematics and Statistics by Title

Now showing items 634-653 of 1633

    • Article  

      L1-Adaptive control: Stability, robustness, and interpretations 

      Ioannou, Petros A.; Annaswamy, A. M.; Narendra, K. S.; Jafari, S.; Rudd, L.; Ortega, R.; Boskovic, J. (2014)
      An adaptive control design approach that involves the insertion of a strictly proper stable filter at the input of standard Model Reference Adaptive Control (MRAC) schemes has been proposed in the recent years. This approach ...
    • Article  

      L2-approximations of power and logarithmic functions with applications to numerical conformal mapping 

      Maymeskul, V. V.; Saff, E. B.; Stylianopoulos, Nikos S. (2002)
      For a bounded Jordan domain G with quasiconformal boundary L, two-sided estimates are obtained for the error in best L2(G) polynomial approximation to functions of the form (z - τ)β, β > -1, and (z - τ)m logl(z - τ), m > ...
    • Article  

      Laminar axisymmetric flow of a weakly compressible viscoelastic fluid 

      Housiadas, Kostas D.; Georgiou, Georgios C.; Mamoutos, Ioannis G. (2012)
      The combined effects of weak compressibility and viscoelasticity in steady, isothermal, laminar axisymmetric Poiseuille flow are investigated. Viscoelasticity is taken into account by employing the Oldroyd-B constitutive ...
    • Article  

      Laminar jets of Bingham-plastic liquids 

      Ellwood, K. R. J.; Georgiou, Georgios C.; Papanastasiou, T. C.; Wilkes, J. O. (1990)
      The steady and transient behavior of jets generated by circular and slit nozzles are analyzed by the Galerkin finite-element method with free-surface parametrization and Newton iteration. A novel constitutive equation is ...
    • Article  

      Laminar Newtonian jets at high Reynolds number and high surface tension 

      Georgiou, Georgios C.; Papanastasiou, T. C.; Wilkes, J. O. (1988)
    • Conference Object  

      Lane change guidance for freeway incident management 

      Wang, Y.; Chang, H.; Ioannou, Petros A. (2009)
      This study proposes a design and evaluation method of lane change guidance system for freeway incident management. Microscopic simulator VISSIM is used to facilitate the design and evaluation. Sixteen incident scenarios ...
    • Article  

      The Laplace equation with discontinuous boundary data: Convergence of the spectral element discretization 

      Bernardi, C.; Karageorghis, Andreas (1997)
      We prove an existence result for the Laplace equation in a disk with discontinuous Dirichlet boundary conditions: 0 on part of the boundary and 1 on its complement. The problem is discretized by the mortar spectral element ...
    • Article  

      Laplace type invariants for variable coefficient mKdV equations 

      Tsaousi, Christina; Tracinà, Rita; Sophocleous, Christodoulos (2015)
      We consider a class of variable-coefficient mKdV equations. We derive the equivalence transformations in the infinitesimal form and we employ them to construct differential invariants of the respective equivalence algebra. ...
    • Article  

      Laplace type invariants for variable coefficient mKdV equations[ONLINE] 

      Tsaousi, Christina; Tracinà, Rita; Sophocleous, Christodoulos (2015)
    • Article  

      Large sample theory for statistics of stable moving averages 

      McElroy, T.; Politis, Dimitris Nicolas (2004)
      We study the limit behavior of the partial sums, sample variance, and periodogram of the stable moving average process x(t)= ∫ ψ(t + x)double struck M sign (dx) explored in Resnick, S., Samorodnitsky, G., and Xue, F. (1999). ...
    • Article  

      Large-sample inference in the general AR(1) model 

      Paparoditis Efstathios, E.; Politis, Dimitris Nicolas (2000)
      The situation where the available data arise from a general AR(1) model is discussed, and two new avenues for constructing confidence intervals for the unknown autoregressive root are proposed, one based on a Central Limit ...
    • Article  

      Large-sample inference in the general AR(1) modelAAA 

      Paparoditis Efstathios, E.; Politis, Dimitris Nicolas (2000)
      The situation where the available data arise from a general AR(1) model is discussed, and two new avenues for constructing confidence intervals for the unknown autoregressive root are proposed, one based on a Central Limit ...
    • Article  

      LASSO order selection for sparse autoregression: a bootstrap approach 

      Fenga, L.; Politis, Dimitris Nicolas (2017)
      Autoregressive models are widely employed for predictions and other inferences in many scientific fields. While the determination of their order is in general a difficult and critical step, this task becomes more complicated ...
    • Article  

      Lax pairs, symmetries and recursion operators for Toda lattices 

      Damianou, Pantelis A. (1997)
      With the exception of some minor results and some conjectures, this paper is a survey of the finite nonperiodic Toda lattices and some of their generalizations. The areas investigated include Lax pairs, master symmetries, ...
    • Article  

      Learning and Convergence Analysis of Neural-Type Structured Networks 

      Polycarpou, Marios M.; Ioannou, Petros A. (1992)
      A special class of feedforward neural networks, referred to as structured networks, has recently been introduced as a method for solving matrix algebra problems in an inherently parallel formulation. In this paper we present ...
    • Conference Object  

      Learning laws exponential error convergence for recurrent neural networks 

      Kosmatopoulos, Elias B.; Christodoulou, Manolis A.; Ioannou, Petros A. (Publ by IEEE, 1993)
      In this paper, we propose new learning laws for adjusting the weights of recurrent high order neural networks (RHONN) when they are used to system identification problems. The main advantages of these learning laws over ...
    • Conference Object  

      Learning techniques for structured networks 

      Polycarpou, Marios M.; Ioannou, Petros A. (Publ by American Automatic Control Council, 1991)
      A convergence analysis is presented for the training of structured networks. Since the learning techniques that are used in structured networks are the same as the ones used in training of neural networks, the issue of ...
    • Book  

      Lectures notes on elementary number theory 

      Δαμιανού, Παντελής Α. ([s.n.], 2010)
    • Article  

      Legendre Gauss spectral collocation for the Helmholtz equation on a rectangle 

      Bialecki, B.; Karageorghis, Andreas (2004)
      A spectral collocation method with collocation at the Legendre Gauss points is discussed for solving the Helmholtz equation -Δu+κ(x,y)u=f(x,y) on a rectangle with the solution u subject to inhomogeneous Robin boundary ...
    • Article  

      A legendre spectral collocation method for the biharmonic Dirichlet problem 

      Bialecki, B.; Karageorghis, Andreas (2000)
      A Legendre spectral collocation method is presented for the solution of the biharmonic Dirichlet problem on a square. The solution and its Laplacian are approximated using the set of basis functions suggested by Shen, which ...