Browsing Τμήμα Μαθηματικών και Στατιστικής / Department of Mathematics and Statistics by Title
Now showing items 525-544 of 1633
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A Haar-Fisz technique for locally stationary volatility estimation
(2006)We consider a locally stationary model for financial log-returns whereby the returns are independent and the volatility is a piecewise-constant function with jumps of an unknown number and locations, defined on a compact ...
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Article
Hardy spaces associated with non-negative self-adjoint operators
(2017)The maximal and atomic Hardy spaces Hp and HA p, 0 < p ≤ 1, are considered in the setting of a doubling metric measure space in the presence of a nonnegative self-adjoint operator whose heat kernel has Gaussian localization. ...
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Article
Harmonic analysis on chord arc domains
(2013)In the present paper we study the solvability of the Dirichlet problem for second order divergence form elliptic operators with bounded measurable coefficients which are small perturbations of given operators in rough ...
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Conference Object
Head posture influences the geometric and hemodynamic features on the healthy human carotid bifurcation
(2012)Atherosclerosis is the third leading cause of morbidity and mortality in the Western world. Low and oscillating wall shear stress (WSS) regions have been previously reported as parameters that correlate with the development ...
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Conference Object
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Conference Object
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Article
Heat Kernel Estimates and the Essential Spectrum on Weighted Manifolds
(2013)We consider a complete noncompact smooth Riemannian manifold M with a weighted measure and the associated drifting Laplacian. We demonstrate that whenever the q-Bakry–Émery Ricci tensor on M is bounded below, then we can ...
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Article
The heat trace for the drifting laplacian and schrodinger operators on manifolds
(2019)We study the heat trace for both Schrodinger operators as well as the drifting Laplacian on compact Riemannian manifolds. In the case of a finite regularity (bounded and measurable) potential or weight function, we prove ...
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Conference Object
HelioTrope: An innovative and efficient prototype for solar power production
(EDP Sciences, 2014)The solar energy alternative could provide us with all the energy we need as it exist in vast quantities all around us. We only should be innovative enough in order to improve the efficiency of our systems in capturing and ...
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Hemodynamics in stenotic vessels of small diameter under steady state conditions: Effect of viscoelasticity and migration of red blood cells
(2015)BACKGROUND: In microcirculation, the non-Newtonian behavior of blood and the complexity of the microvessel network are responsible for the high flow resistance and the large reduction of the blood pressure. Red blood cell ...
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Article
Heteroscedastic one-way ANOVA and lack-of-fit tests
(2004)Recent articles have considered the asymptotic behavior of the one-way analysis of variance (ANOVA) F statistic when the number of levels or groups is large. In these articles, the results were obtained under the assumption ...
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Conference Object
Heteroskedastic linear regression: Steps towards adaptivity, efficiency, and robustness
(Springer New York LLC, 2014)In linear regression with heteroscedastic errors, the Generalized Least Squares (GLS) estimator is optimal, i.e., it is the Best Linear Unbiased Estimator (BLUE). The Ordinary Least Squares (OLS) estimator is suboptimal ...
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Conference Object
A heuristic search algorithm for maneuvering of UAVs across dense thermal areas
(2007)In order to ensure that an aircraft has the potential to meet the assigned performance requirements which are often mission specific, the particular aerodynamic demands involved must be taken into account during the aircraft ...
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Article
A heuristic solution for the empty container substitution problem
(2008)This paper studies substitution between empty containers of different types in an attempt to reduce the cost of empty container interchange. Since finding an optimal solution requires substantial computational efforts, a ...
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High performance solution of linear systems arising from conforming spectral approximations for non-conforming domain decompositions
(1997)We apply a conforming spectral collocation technique to nonconforming domain decompositions. The resulting global matrices have a particular block structure. We study the performance of various direct methods of solution ...
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High performance solution of partial differential equations discretized using a chebyshev spectral collocation method
(1996)When a Chebyshev spectral collocation method is applied to a flow problem in a rectangularly decomposable domain it leads to the solution of a structured linear system. Since the linear system is solved at each step of a ...
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High resolution nested model for the Cyprus, NE Levantine Basin, eastern Mediterranean Sea: Implementation and climatological runs
(2003)A high resolution nested flow model for the coastal, shelf and open sea areas of the Cyprus Basin, NE Levantine, eastern Mediterranean Sea is implemented to fulfil the objectives of the Mediterranean Forecasting System ...
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High-dimensional autocovariance matrices and optimal linear prediction
(2015)A new methodology for optimal linear prediction of a stationary time series is introduced. Given a sample X1,…,Xn, the optimal linear predictor of Xn+1 is Xn+1 = Φ1(n)Xn + Φ2(n)Xn−1 + + Φn(n)X1. In practice, the coefficient ...
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Article
Higher Integrability of the gradient for the Thermal Insulation Problem
(EMS Press, 2023)We prove the higher integrability of the gradient for local minimizers of the thermal insulation problem: an analogue of De Giorgi’s conjecture for the Mumford–Shah functional. We deduce that the singular part of the ...
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Article
Higher-order accurate polyspectral estimation with flat-top lag-windows
(2009)Improved performance in higher-order spectral density estimation is achieved using a general class of infinite-order kernels. These estimates are asymptotically less biased but with the same order of variance as compared ...