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Browsing by Subject "Matrix algebra"

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    • Article  

      Adaptive control of a class of slowly time varying systems with modeling uncertainties 

      Fidan, B.; Zhang, Y.; Ioannou, Petros A. (2005)
      In a recent work, a new linear adaptive controller based on certainty-equivalence and backstepping design, which promises a level of transient and asymptotic performance comparable to that of the tuning functions adaptive ...

    • Article  

      Adaptive LQ control with anti-windup augmentation to optimize UAV performance in autonomous soaring applications 

      Kahveci, N. E.; Ioannou, Petros A.; Mirmirani, M. D. (2008)
      The performance of a glider can be considerably improved by means of soaring and optimization of its trajectory. Recent advances in the area of static soaring assume known linear glider dynamics and no actuator saturation ...

    • Conference Object  

      Aliasing probability calculations in nonlinear compactors 

      Hadjicostis, Christoforos N. (2003)
      This paper discusses a systematic methodology for calculating the aliasing probability when an arbitrary finite-state machine is used to compact the response of a combinational circuit to a sequence of randomly generated ...

    • Article  

      Application of three bivariate time-varying volatility models 

      Vrontos, Ioannis D.; Giakoumatos, Stefanos G.; Dellaportas, Petros; Politis, Dimitris Nicolas (2001)
      The multivariate time-varying volatility models have recently attracted a lot of attention in the statistics/econometrics community. We apply two bivariate ARCH-GARCH models and a bivariate unobserved ARCH model to a series ...

    • Article  

      Backstepping Control of Linear Time-Varying Systems with Known and Unknown Parameters 

      Zhang, Y.; Fidan, B.; Ioannou, Petros A. (2003)
      The backstepping control design procedure has been used to develop stabilizing controllers for time invariant plants that are linear or belong to some class of nonlinear systems. The use of such a procedure to design ...

    • Article  

      Bounds on FSM switching activity 

      Athanasopoulou, E.; Hadjicostis, Christoforos N. (2008)
      This paper obtains lower and upper bounds for the switching activity on the state lines of a finite state machine (FSM) that is driven by typical input sequences. More specifically, the paper provides bounds on the average ...

    • Conference Object  

      Classification of satellite cloud imagery based on multi-feature texture analysis and neural networks 

      Christodoulou, Christodoulos I.; Michaelides, Silas C.; Pattichis, Constantinos S.; Kyriakou, Kyriaki (2001)
      The aim of this work was to develop a system based on modular neural networks and multi-feature texture analysis that will facilitate the automated interpretation of cloud images. This will speed up the interpretation ...

    • Article  

      Commutative nilpotent closed algebras and weil representations 

      Pallikaros, Christakis Andrea; Ward, H. N. (2015)
      Let F be the field GF(q2) of q2 elements, q odd, and let V be an F-vector space endowed with a nonsingular Hermitian form φ. Let σ be the adjoint involutory antiautomorphism of EndFV associated to the form, and let U(φ) ...

    • Article  

      Conditional densities for continuous-time nonlinear hybrid systems with applications to fault detection 

      Hibey, Joseph L.; Charalambous, Charalambos D. (1998)
      Continuous-time nonlinear stochastic differential state and measurement equations, all of which have coefficients capable of abrupt changes at a random time, are considered; finite-state jump Markov chains are used to model ...

    • Article  

      Conditional densities for continuous-time nonlinear hybrid systems with applications to fault detection 

      Hibey, J. L.; Charalambous, Charalambos D. (1999)
      Continuous-time nonlinear stochastic differential state and measurement equations, all of which have coefficients capable of abrupt changes at a random time, are considered; finite-state jump Markov chains are used to model ...

    • Article  

      Conditioning of pseudospectral matrices for certain domain decompositions 

      Karageorghis, Andreas; Paprzycki, M. (1999)
      In this paper we examine the conditioning of the matrices resulting from certain conforming pseudospectral approximations. In particular, we consider non-conforming domain decompositions in rectangular domains and the ...

    • Conference Object  

      A convex programming approach to the multiobjective H2/H∞ problem 

      Djouadi, S. M.; Charalambous, Charalambos D.; Repperger, D. W. (2002)
      In this paper, Banach space duality theory for the multiobjective H2/H∞ problem developed recently by the authors, is used to develop algorithms to solve this problem by approximately reducing the dual and predual ...

    • Article  

      Current transport in semiconductor nanowires with built-in barriers based on a 1D transfer matrix calculation 

      Zervos, Matthew; Pelekanos, N. T. (2008)
      A one dimensional (1D) transfer matrix calculation of current transport in semiconductor nanowires with built-in barriers is described within the effective mass approximation by taking into account (i) the quantum confinement ...

    • Conference Object  

      De-speckle filtering in ultrasound imaging of the carotid artery 

      Christodoulou, Christodoulos I.; Loizou, Christos P.; Pattichis, Constantinos S.; Pantzaris, Marios C.; Kyriacou, Efthyvoulos C.; Pattichis, Marios S.; Schizas, Christos N.; Nicolaïdes, Andrew N. (2002)
      The main objective of this paper is to evaluate the classification performance of de-speckle filtering on ultrasound imaging of the carotid atherosclerotic plaque. The following procedure was investigated on 230 images ...

    • Article  

      Delayed observers for linear systems with unknown inputs 

      Sundaram, S.; Hadjicostis, Christoforos N. (2007)
      We present a method for constructing reduced-order state observers for linear systems with unknown inputs. Our approach provides a characterization of observers with delay, which eases the established necessary conditions ...

    • Article  

      Design of strictly positive real systems using constant output feedback 

      Huang, C. -H; Ioannou, Petros A.; Maroulas, J.; Safonov, M. G. (1999)
      In this paper, the authors present a linear matrix inequality (LMI) approach to the strictly positive real (SPR) synthesis problem: find an output feedback K such that the closed-loop system T(s) is SPR. The authors establish ...

    • Article  

      Direct methods for spectral approximations in nonconforming domain decompositions 

      Karageorghis, Andreas; Paprzycki, M. (1998)
      The application of a conforming spectral collocation method to certain nonconforming domain decompositions leads to global matrices which have a particular block structure. We study the performance of various direct linear ...

    • Article  

      Distributed function calculation and consensus using linear iterative strategies 

      Sundaram, S.; Hadjicostis, Christoforos N. (2008)
      Given an arbitrary network of interconnected nodes, we develop and analyze a distributed strategy that enables a subset of the nodes to calculate any given function of the node values. Our scheme utilizes a linear iteration ...

    • Conference Object  

      Encoded finite-state machines for non-concurrent error detection and identification 

      Hadjicostis, Christoforos N. (2003)
      In this paper we develop a methodology for systematically constructing redundant finite-state machines in a way that enables an external mechanism to detect and identify transient state-transition faults by performing ...

    • Conference Object  

      Exact filters for Newton-Raphson parameter estimation algorithms for continuous-time partially observed stochastic systems 

      Charalambous, Charalambos D.; Logothetis, Andrew; Hibey, Joseph L. (IEEE, 1999)
      This paper presents explicit finite-dimensional filters for implementing Newton-Raphson (NR) parameter estimation algorithms. The models which exhibit nonlinear parameter dependence are stochastic, continuous-time and ...

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