Browsing Τμήμα Μαθηματικών και Στατιστικής / Department of Mathematics and Statistics by Title
Now showing items 1555-1574 of 1633
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Article
U-statistics on a lattice of I.I.D. random variables
(1998)Partial sums and sample means of r-dimensionally indexed arrays of independent random variables have been studied by Dunford (1951), Zygmund (1951), Kuelbs (1968), Wichura (1969), Smythe (1973), Gut (1978, 1992), Etemadi ...
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Article
U-statistics on associated random variables
(2004)We consider the class of U-statistics which are based on a collection of associated random variables. Since independent random variables are associated, the class of U-statistics introduced by Hoeffding (Ann. Math. Statist. ...
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Article
Unbiased Monte Carlo: Posterior estimation for intractable/infinite-dimensional models
(2018)We provide a general methodology for unbiased estimation for intractable stochastic models. We consider situations where the target distribution can be written as an appropriate limit of distributions, and where conventional ...
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Article
The under-determined version of the MFS: Taking more sources than collocation points
(2010)In this study we investigate the approximation of the solutions of certain elliptic boundary value problems by the Method of Fundamental Solutions (MFS). In particular, we study the case in which the number of singularities ...
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Article
Underexpression of the apolipoprotein E2 and E4 alleles in the Greek Cypriot population of Cyprus
(1995)Apolipoprotein E (APOE) plays an important role in the multifactorial etiology of both cardiovascular disease and Alzheimer's disease. Polymerase chain reaction (PCR) was used to investigate the APOE gene polymorphism in ...
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Article
A unified treatment for non-asymptotic and asymptotic approaches to minimax signal detection
(2015)We are concerned with minimax signal detection. In this setting, we discuss non-asymptotic and asymptotic approaches through a unified treatment. In particular, we consider a Gaussian sequence model that contains classical ...
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Article
Uniform approximation of singularly perturbed reaction-diffusion problems by the finite element method on a Shishkin mesh
(2003)We consider the numerical approximation of singularly perturbed reaction-diffusion problems over two-dimensional domains with smooth boundary. Using the h version of the finite element method over appropriately designed ...
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Article
Uniqueness and sharp estimates on solutions to hyperbolic systems with dissipative source
(2006)Global weak solutions of a strictly hyperbolic system of balance laws in one-space dimension were constructed (cf. Christoforou, 2006) via the vanishing viscosity method under the assumption that the source term g is ...
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Article
A uniqueness criterion for viscous limits of boundary Riemann problems
(2011)We deal with the initial boundary value problem for systems of conservation laws in one space dimension and we focus on the boundary Riemann problem. It is known that, in general, different viscous approximations provide ...
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Book
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Article
Unit root testing via the stationary bootstrap
(2006)A nonparametric, residual-based stationary bootstrap procedure is proposed for unit root testing in a time series. The procedure generates a pseudoseries which mimics the original, but ensures the presence of a unit root. ...
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Book Chapter
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Article
Unit root testing via the stationary bootstrapAAA
(2006)A nonparametric, residual-based stationary bootstrap procedure is proposed for unit root testing in a time series. The procedure generates a pseudoseries which mimics the original, but ensures the presence of a unit root. ...
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Article
Universal approximation by translates of fundamental solutions of elliptic equations
(2011)In the present work, we investigate the approximability of solutions of elliptic partial differential equations in a bounded domain ω by universal series of translates of fundamental solutions of the underlying partial ...
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Article
Universal series in ∩p>1ℓp
(2010)In this paper an abstract condition is given yielding universal series defined by sequences a = {aj}∞ j=1 in ∩p>1ℓp but not in ℓ1. We obtain a unification of some known results related to approximation by translates of ...
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Article
Unsteady circular Couette flow of a Bingham plastic with the Augmented Lagrangian Method
(2010)Numerical simulations are undertaken for unsteady flows of an ideal Bingham fluid in a circular Couette viscometer. The main difficulties in such simulations are caused by the non-differentiability of the constitutive ...
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Article
An Updated Literature Review of Distance Correlation and Its Applications to Time Series
(2019)The concept of distance covariance/correlation was introduced recently to characterise dependence among vectors of random variables. We review some statistical aspects of distance covariance/correlation function, and we ...
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Article
The use of conformal transformations for the numerical solution of elliptic boundary value problems with boundary singularities
(1979)onto. Ω¯
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Article
The use of curved elements in the finite element approximation of thin plates by high order p and hp methods
(2006)In this article we focus on the approximation of the Reissner-Mindlin (R-M) plate model by high-order p and hp versions of the Finite Element Method (FEM), in the case when the mesh includes curved elements
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Conference Object
The use of microscopic traffic simulation model for traffic control systems
(2007)A highway network model is constructed using a microscopic traffic flow simulation model, VISSIM, and is intended to provide an evaluation environment for advanced traffic control systems. Since the microscopic traffic ...