Browsing Τμήμα Μαθηματικών και Στατιστικής / Department of Mathematics and Statistics by Title
Now showing items 849-868 of 1633
-
Article
Near best tree approximation
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
-
Article
New model for variable speed limits
(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
(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