Now showing items 849-868 of 1633

    • Article  

      Near best tree approximation 

      Baraniuk, R. G.; DeVore, R. A.; Kyriazis, George C.; Yu, X. M. (2002)
      Tree approximation is a form of nonlinear wavelet approximation that appears naturally in applications such as image compression and entropy encoding. The distinction between tree approximation and the more familiar n-term ...
    • Article  

      Necessary and sufficient conditions for strictly positive real matrices 

      Tao, G.; Ioannou, Petros A. (1990)
      In this paper we present some useful properties of strictly positive real transfer matrices for both continuous and discrete-time linear time-invariant systems in the frequency and state space domains. Some of these ...
    • Article  

      The negative relativistic toda hierarchy and rational poisson brackets 

      da Costa, J. M. N.; Damianou, Pantelis A. (2004)
      We define hierarchies for negative values of the index of Poisson tensors, master symmetries and Hamiltonians for the finite, nonperiodic, relativistic Toda lattice. We show that the usual relations between master symmetries, ...
    • Article  

      The negative Toda hierarchy and rational Poisson brackets 

      Damianou, Pantelis A. (2003)
      In this paper we extend the usual hierarchies for the finite, nonperiodic Toda lattice for negative values of the index. We define an infinite sequence of rational homogeneous Poisson brackets, master symmetries, invariants ...
    • Article  

      Neumann domination for the Yang-Mills heat equation 

      Charalambous, N.; Gross, L. (2015)
      Long time existence and uniqueness of solutions to the Yang-Mills heat equation have been proven over a compact 3-manifold with boundary for initial data of finite energy. In the present paper, we improve on previous ...
    • Conference Object  

      Neural network control of unknown systems 

      Kosmatopoulos, Elias B.; Chassiakos, Anastassios; Boussalis, Helen R.; Mirmirani, Maj; Ioannou, Petros A. (IEEE, 1998)
      In this paper, we show that for all unknown Multi-Input (MI) nonlinear system that affected by external disturbances, it is possible to construct a semi-global state-feedback stabilizer when the only information about the ...
    • Article  

      A neural-networks-based adaptive disturbance rejection method and its application to the control of hard disk drives 

      Levin, J.; Pérez-Arancibia, N. O.; Ioannou, Petros A.; Tsao, T. -C (2009)
      This paper presents a neural-networks-based disturbance rejection adaptive scheme for dealing with repeatable and nonrepeatable runout simultaneously. The effectiveness of this method is demonstrated empirically on a ...
    • Article  

      New analytical solutions for weakly compressible Newtonian Poiseuille flows with pressure-dependent viscosity 

      Housiadas, Kostas D.; Georgiou, Georgios C. (2016)
      Steady-state, isothermal, Poiseuille flows in straight channels and circular tubes of weakly compressible Newtonian fluids are considered. The major assumption is that both the mass density and the shear viscosity of the ...
    • Article  

      A new approach on estimation of the tail index 

      Politis, Dimitris Nicolas (2002)
      A new approach on tail index estimation is proposed based on studying the in-sample evolution of appropriately chosen diverging statistics. The resulting estimators are simple to construct, and they can be generalized to ...
    • Article  

      New bases for Triebel-Lizorkin and Besov spaces 

      Kyriazis, George C.; Petrushev, P. (2002)
      We give a new method for construction of unconditional bases for general classes of Triebel-Lizorkin and Besov spaces. These include the Lp, Hp, potential, and Sobolev spaces. The main feature of our method is that the ...
    • Article  

      A new bound for the Fejér-Jackson sum 

      Brown, G.; Koumandos, S. (1998)
      We establish a new positive functional estimate for the FejérJackson sum Sn(θ) = Σnk=1 k-1 sin kθ. This result enables us to give a simple proof of a result of Askey and Steinig on a monotonic sine sum associated with the ...
    • Article  

      A new class of nonlinear robust adaptive controllers 

      Zhang, Y.; Ioannou, Petros A. (1996)
      Recently, a new class of adaptive control schemes, motivated from nonlinear systems theory, has been proposed for minimum phase linear time invariant plants. Under certain assumptions on the plant transfer function, these ...
    • Article  

      A new family of divergence measures for tests of fit 

      Mattheou, K.; Karagrigoriou, Alex (2010)
      Summary: The aim of this work is to investigate a new family of divergence measures based on the recently introduced Basu, Harris, Hjort and Jones (BHHJ) measure of divergence (Biometrika 85, 549-559). The new family is ...
    • Conference Object  

      New indirect adaptive control scheme for time-varying plants 

      Tsakalis, Kostas S.; Ioannou, Petros A. (Publ by IEEE, 1988)
      An indirect adaptive control scheme for linear time-varying plants is presented which guarantees the closed-loop stability and exact tracking of a class of reference input signals. By incorporating any a priori available ...
    • Article  

      A New Indirect Adaptive Control Scheme for Time-Varying Plants 

      Tsakalis, Kostas S.; Ioannou, Petros A. (1990)
      An indirect robust adaptive controller designed for linear time-invariant plants may also meet its control objective approximately for slowly time-varying plants. The plant parameter variations act as a disturbance in the ...
    • Article  

      A new linear adaptive controller: Design, analysis and performance 

      Zhang, Y.; Ioannou, Petros A. (2000)
      The certainty equivalence and polynomial approach, widely used for designing adaptive controllers, leads to "simple" adaptive control designs that guarantee stability, asymptotic error convergence, and robustness, but not ...
    • Article  

      A new method for modelling the space variability of significant wave height 

      Baxevani, Anastassia; Rychlik, I.; Wilson, R. J. (2005)
      Significant wave height, Hs, is a measure of the variability of the ocean surface and is defined to be four times the standard deviation of the height of the ocean surface. In this paper, we present a methodology for ...
    • Article  

      A New Method for the Analysis of Supersaturated Designs with Discrete Data 

      Androulakis, Emmanouil; Koukouvinos, Christos; Vonta, Filia (2016)
    • Article  

      New model for variable speed limits 

      Wang, Y.; Ioannou, Petros A. (2011)
      Traffic flow models play an irreplaceable role in the design and evaluation of variable speed limit (VSL) controllers. All existing models for incorporating VSL effects are based on modifications of the steady-state ...
    • Article  

      A new non-invasive prenatal diagnosis of Down syndrome through epigenetic markers and real-time qPCR 

      Patsalis, Philippos C.; Tsaliki, Evdokia; Koumbaris, George L.; Karagrigoriou, Alex; Velissariou, Voula; Papageorgiou, Elisavet A. (2012)
      Introduction: Non-invasive prenatal diagnosis (NIPD) of Down syndrome is rapidly evolving. Currently, two applications for NIPD of Down syndrome have been developed with potential and have displayed positive results