Results 41 to 50 of about 12,853 (184)

FFT, FMM, or Multigrid? A comparative Study of State-Of-the-Art Poisson Solvers for Uniform and Nonuniform Grids in the Unit Cube

, 2016
In this work, we benchmark and discuss the performance of the scalable methods for the Poisson problem which are used widely in practice: the fast Fourier transform (FFT), the fast multipole method (FMM), the geometric multigrid (GMG), and algebraic ...
Biros, George, Gholami, Amir, Malhotra, Dhairya, Sundar, Hari   +3 more
core   +1 more source

Efficient Algorithm for Isotropic and Anisotropic Total Variation Deblurring and Denoising

Journal of Applied Mathematics, 2013
A new deblurring and denoising algorithm is proposed, for isotropic total variation-based image restoration. The algorithm consists of an efficient solver for the nonlinear system and an acceleration strategy for the outer iteration.
Yuying Shi, Qianshun Chang
doaj   +1 more source

Uniform convergence of V-cycle multigrid algorithms for two-dimensional fractional Feynman-Kac equation

, 2017
In this paper we derive new uniform convergence estimates for the V-cycle MGM applied to symmetric positive definite Toeplitz block tridiagonal matrices, by also discussing few connections with previous results. More concretely, the contributions of this
Chen, Minghua, Deng, Weihua, Serra-Capizzano, Stefano   +2 more
core   +1 more source

Application of Fourier transform to MHD flow over an accelerated plate with partial-slippage

AIP Advances, 2014
Magneto-Hydrodynamic (MHD) flow over an accelerated plate is investigated with partial slip conditions. Generalized Fourier Transform is used to get the exact solution not only for uniform acceleration but also for variable acceleration.
Salman Ahmad, Shafqat Hussain, Abuzar Abid Siddiqui, Asad Ali, Muhammad Aqeel   +4 more
doaj   +1 more source

Adaptive control in rollforward recovery for extreme scale multigrid

, 2018
With the increasing number of compute components, failures in future exa-scale computer systems are expected to become more frequent. This motivates the study of novel resilience techniques.
Huber, Markus, Rüde, Ulrich, Wohlmuth, Barbara   +2 more
core   +1 more source

Classification of Hyperspectral Images by SVM Using a Composite Kernel by Employing Spectral, Spatial and Hierarchical Structure Information

Remote Sensing, 2018
In this paper, we introduce a novel classification framework for hyperspectral images (HSIs) by jointly employing spectral, spatial, and hierarchical structure information.
Yi Wang, Hexiang Duan
doaj   +1 more source

The Effect of Multigrid Parameters in a 3D Heat Diffusion Equation

International Journal of Applied Mechanics and Engineering, 2018
The aim of this paper is to reduce the necessary CPU time to solve the three-dimensional heat diffusion equation using Dirichlet boundary conditions. The finite difference method (FDM) is used to discretize the differential equations with a second-order ...
F. De Oliveira, S.R. Franco, M.A. Villela Pinto   +2 more
doaj   +1 more source

Algebraic Multigrid for Stokes Equations

SIAM Journal on Scientific Computing, 2017
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +3 more sources

A fast constrained image segmentation algorithm

Results in Applied Mathematics, 2020
Normalized cut or Ncut has been one of the most widely used models for image processing. A constraint can also be included in the framework of Ncut to represent a priori information for an effective image segmentation.
Iván Ojeda-Ruiz, Young-Ju Lee
doaj   +1 more source

A Hybrid a–φ Cell Method for Solving Eddy–Current Problems in 3–D Multiply–Connected Domains

IEEE Access, 2021
A hybrid $a - \varphi $ Cell Method formulation for solving eddy–current problems in 3–D multiply–connected regions is presented.
Federico Moro, Artem Napov, Lorenzo Codecasa   +2 more
doaj   +1 more source