Browsing Τμήμα Μαθηματικών και Στατιστικής / Department of Mathematics and Statistics by Title
Now showing items 1597-1616 of 1633
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Article
Wall shear rates in circular couette flow of a Herschel-Bulkley fluid
(2009)The objective of this work is to study quantitatively the errors introduced by the standard Newtonian and power-law assumptions used in the determination of the material properties of viscoplastic fluids from circular ...
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Article
A warp-speed method for conducting Monte Carlo experiments involving bootstrap estimators
(2013)We analyze fast procedures for conducting Monte Carlo experiments involving bootstrap estimators, providing formal results establishing the properties of these methods under general conditions. © 2012 Cambridge University Press.
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Book Chapter
Water management in Cyprus through a decision-support system
(Edward Elgar Publishing, 2003)
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Article
Wave energy potential in the Eastern Mediterranean Levantine Basin. An integrated 10-year study
(2014)The main characteristics of wave energy potential over Eastern Mediterranean Levantine Basin, an area of increased interest for energy resources exploration/exploitation, is presented in this work. In particular, an ...
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Article
Wavelet analysis and its statistical applications
(2000)In recent years there has been a considerable development in the use of wavelet methods in statistics. As a result, we are now at the stage where it is reasonable to consider such methods to be another standard tool of the ...
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Article
Wavelet coefficients measuring smoothness in H p(ℝd)
(1996)We investigate the connection between Besov spaces and certain approximation subspaces of the Hardy spaces Hp(ℝd), 0 < p ≤ 1. In particular, we establish the wavelet decompositions for the Hp(ℝd) spaces and we characterize ...
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Article
Wavelet compression and nonlinear n-widths
(1993)It is shown that certain algorithms of compression based on wavelet decompositions are optimal in the sense of nonlinear n-widths. © 1993 J.C. Baltzer AG, Science Publishers.
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Article
Wavelet density estimation for weighted data
(2014)We consider the estimation of a density function on the basis of a random sample from a weighted distribution. We propose linear and nonlinear wavelet density estimators, and provide their asymptotic formulae for mean ...
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Article
Wavelet estimators in nonparametric regression: A comparative simulation study
(2001)Wavelet analysis has been found to be a powerful tool for the nonparametric estimation of spatially-variable objects. We discuss in detail wavelet methods in nonparametric regression, where the data are modelled as ...
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Article
Wavelet instruments for efficiency gains in generalized method of moment models
(2007)We propose a simple computational method in the context of generalized method of moments for improving the efficiency of regression coefficient estimates. The gains in efficiency arise by incorporating additional moment ...
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Article
Wavelet methods for continuous-time prediction using Hilbert-valued autoregressive processes
(2003)We consider the prediction problem of a continuous-time stochastic process on an entire time-interval in terms of its recent past. The approach we adopt is based on the notion of autoregressive Hilbert processes that ...
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Article
Wavelet packet transfer function modelling of nonstationary time series
(2002)This article shows how a non-decimated wavelet packet transform (NWPT) can be used to model a response time series, Yt in terms of an explanatory time series, Xt. The proposed computational technique transform the explanatory ...
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Article
Wavelet shrinkage for natural exponential families with quadratic variance functions
(2001)We propose a wavelet shrinkage methodology for univariate natural exponential families with quadratic variance functions, covering the Gaussian, Poisson, gamma, binomial, negative binomial and generalised hyperbolic secant ...
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Article
Wavelet thresholding via a Bayesian approach
(1998)We discuss a Bayesian formalism which gives rise to a type of wavelet threshold estimation in nonparametric regression. A prior distribution is imposed on the wavelet coefficients of the unknown response function, designed ...
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Article
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Article
Weak convergence of dependent empirical measures with application to subsampling in function spaces
(1999)Consider the problem of inference for a parameter of a stationary time series, where the parameter takes values in a metric space (such as a function space). In this paper, we develop asymptotic theory based on subsampling ...
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Article
Weakly compressible Poiseuille flows of a Herschel-Bulkley fluid
(2009)In this work, we derive approximate semi-analytical solutions of the steady, creeping, weakly compressible plane and axisymmetric Poiseuille flows of a Herschel-Bulkley fluid. Since the flow is weakly compressible, the ...
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Article
Weil representations and some nonreductive dual pairs in symplectic and unitary groups
(2011)We study the restriction of the Weil representations of symplectic and unitary groups to subgroups that are the centralizers of certain elements, and show that these are multiplicity free. This work is along the line of ...
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Conference Object
What is L1 adaptive control
(2013)Recently, a class of adaptive control schemes called L1 Adaptive Control (L1-AC) has been proposed and widely advertised in aerospace control for achieving fast and robust adaptation and better performance than the existing ...
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Article
The Yang-Mills Heat Semigroup on Three-Manifolds with Boundary
(2013)Long time existence and uniqueness of solutions to the Yang-Mills heat equation is proven over a compact 3-manifold with smooth boundary. The initial data is taken to be a Lie algebra valued connection form in the Sobolev ...