检索结果-南通市图书馆

QoS Guided Min—Min Heuristic for Grid Task Scheduling

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of computer science & Technology 2003年第4期18卷 442-451页

作者：何晓珊孙贤和 Gregor von Laszewski department of computer science Illinois Institute of Technology IL USA mathematics and computer science Division Argonne National Laboratory IL USA

Task scheduling is an integrated component of computing. With the emergence of Grid and ubiquitous computing, new challenges appear in task scheduling based on properties such as security, quality of service, and lack of central control within distributed administrative domains. A Grid task scheduling framework must be able to deal with these issues. One of the goals of Grid task scheduling is to achieve high system throughput while matching applications with the available computing resources. This matching of resources in a non-deterministically shared heterogeneous environment leads to concerns over Quality of Service (QoS). In this paper a novel QoS guided task scheduling algorithm for Grid computing is introduced. The proposed novel algorithm is based on a general adaptive scheduling heuristics that includes QoS *** algorithm is evaluated within a simulated Grid environment. The experimental results show that the new QoS guided Min-Min heuristic can lead to significant performance gain for a variety of applications. The approach is compared with others based on the quality of the prediction formulated by inaccurate information.

关键词： QoS 任务调度网格计算服务质量非贡献计算

Uniform and L-convergence of Logarithmic Means of Walsh-Fourier Series

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2006年第2期22卷 497-506页

作者： G.GáT U.GOGINAVA Institute of mathematics and computer science College of Nyiregyhaza department of Mechanics and mathematics Tbilisi State University

The （NSrlund） logarithmic means of the Fourier series of the integrable function f is：1/lnn-1∑k=1Sk（f）/n-k, where ln：=n-1∑k=11/k.In this paper we discuss some convergence and divergence properties of this logarithmic means of the Walsh-Fourier series of functions in the uniform, and in the L^1 Lebesgue norm. Among others, as an application of our divergence results we give a negative answer to a question of Móricz concerning the convergence of logarithmic means in norm.

关键词： Walsh system Norlund logarithmic means Convergence divergence properties

A Poincaré Inequality in a Sobolev Space with a Variable Exponent

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of mathematics,Series B 2011年第3期32卷 333-342页

作者： Philippe G.CIARLET George DINCA department of mathematics City University of Hong Kong Faculty of mathematics and computer science University of Bucharest

Let Ω be a domain in RN. It is shown that a generalized Poincaré inequality holds in cones contained in the Sobolev space Wl,P（）（Ω）, where p（.）： Ω → [1, ∞[ is a variable exponent. This inequality is itself a corollary to a more general result about equivalent norms over such cones. The approach in this paper avoids the difficulty arising from the possible lack of density of the space ;D（Ω） in the space {v ∈ Wl,P（）（Ω）; tr v = 0 on δΩ}. Two applications are also discussed.

关键词： Poincaré inequality Sobolev spaces with variable exponent

FURTHER INVESTIGATION INTO APPROXIMATION OF A COMMON SOLUTION OF FIXED POINT PROBLEMS AND SPLIT FEASIBILITY PROBLEMS

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2016年第3期36卷 913-930页

作者： Y.SHEHU O.T.MEWOMO F.U.OGBUISI department of mathematics University of Nigeria School of mathematics Statistics and Computer ScienceUniversity of Kwazulu-Natal

The purpose of this paper is to study and analyze an iterative method for finding a common element of the solution set ~ of the split feasibility problem and the set F（T） of fixed points of a right Bregman strongly nonexpansive mapping T in the setting of p- uniformly convex Banach spaces which are also uniformly smooth. By combining Mann＇s iterative method and the Halpern＇s approximation method, we propose an iterative algorithm for finding an element of the set F（T）∩Ω moreover, we derive the strong convergence of the proposed algorithm under appropriate conditions and give numerical results to verify the efficiency and implementation of our method. Our results extend and complement many known related results in the literature.

关键词： strong convergence split feasibility problem uniformly convex uniformly smooth fixed point problem right Bregman strongly nonexpansive mappings

Variant Wasserstein Generative Adversarial Network Applied on Low Dose CT Image Denoising

在线全文

学校读者我要写书评

暂无评论

computers, Materials & Continua 2023年第5期75卷 4535-4552页

作者： Anoud A.Mahmoud Hanaa A.Sayed Sara S.Mohamed department of mathematics and computer science Faculty of ScienceNew Valley UniversityNew Valley72511Egypt department of computer science College of Computer Science and Engineering Taibah UniversityMedina42221KSA department of mathematics Faculty of ScienceAssiut UniversityAssiut71516Egypt

Computed Tomography(CT)images have been extensively employed in disease diagnosis and treatment,causing a huge concern over the dose of radiation to which patients are *** the radiation dose to get a better image may lead to the development of genetic disorders and cancer in the patients;on the other hand,decreasing it by using a Low-Dose CT(LDCT)image may cause more noise and increased artifacts,which can compromise the ***,image reconstruction from LDCT image data is necessary to improve radiologists’judgment and *** study proposed three novel models for denoising LDCT images based on Wasserstein Generative Adversarial Network(WGAN).They were incorporated with different loss functions,including Visual Geometry Group(VGG),Structural Similarity Loss(SSIM),and Structurally Sensitive Loss(SSL),to reduce noise and preserve important information on LDCT images and investigate the effect of different types of loss ***,experiments have been conducted on the Graphical Processing Unit(GPU)and Central Processing Unit(CPU)to compare the performance of the proposed *** results demonstrated that images from the proposed WGAN-SSIM,WGAN-VGG-SSIM,and WGAN-VGG-SSL were denoised better than those from state-of-the-art models(WGAN,WGAN-VGG,and SMGAN)and converged to a stable equilibrium compared with WGAN and *** proposed models are effective in reducing noise,suppressing artifacts,and maintaining informative structure and texture details,especially WGAN-VGG-SSL which achieved a high peak-signalto-noise ratio(PNSR)on both GPU(26.1336)and CPU(25.8270).The average accuracy of WGAN-VGG-SSL outperformed that of the state-ofthe-art methods by 1 *** prove that theWGAN-VGG-SSL is more stable than the other models on both GPU and CPU.

关键词： Machine learning deep learning image denoising low dose CT loss function

Super d-antimagic Labelings of Disconnected Plane Graphs

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2010年第12期26卷 2283-2294页

作者： Martin BAA Mirka MILLER Oudone PHANALASY Andrea SEMANIOV-FEOVKOV department of Applied mathematics Technical University School of Electrical Engineering and computer science The University of Newcastle department of mathematics University of West Bohemia department of computer science King's College London department of mathematics National University of Laos

This paper deals with the problem of labeling the vertices, edges and faces of a plane graph in such a way that the label of a face and the labels of the vertices and edges surrounding that face add up to a weight of that face, and the weights of all s-sided faces constitute an arithmetic progression of difference d, for each s that appears in the graph. The paper examines the existence of such labelings for disjoint union of plane graphs.

关键词： Plane graph d-antimagic labeling super d-antimagic labeling disjoint union of graphs

Further Investigation into Split Common Fixed Point Problem for Demicontractive Operators

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2016年第11期32卷 1357-1376页

作者： Yekini SHEHU Oluwatosin T.MEWOMO department of mathematics University of Nigeria School of mathematics Statistics and Computer ScienceUniversity of Kwazulu Natal

Our contribution in this paper is to propose an iterative algorithm which does not reqmre prior knowledge of operator norm and prove strong convergence theorem for approximating a solution of split common fixed point problem of demicontractive mappings in a real Hilbert space. So many authors have used algorithms involving the operator norm for solving split common fixed point problem, but as widely known the computation of these Mgorithms may be difficult and for this reason, authors have recently started constructing iterative algorithms with a way of selecting the step-sizes such that the implementation of the algorithm does not require the calculation or estimation of the operator norm. We introduce a new algorithm for solving the split common fixed point problem for demicontractive mappings with a way of selecting the step-sizes such that the implementation of the Mgorithm does not require the calculation or estimation of the operator norm and then prove strong convergence of the sequence in real Hilbert spaces. Finally, we give some applications of our result and numerical example at the end of the paper.

关键词： Demicontractive mappings split common fixed point problems iterative scheme strongconvergence Hilbert spaces

Solving a class of burning disturbed problem with shock layers

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2012年第5期21卷 15-18页

作者：欧阳成陈丽华莫嘉琪 Faculty of science Huzhou Teacher College department of mathematics and computer science Fuqing Branch of Fujian Normal University department of mathematics Anhui Normal University

A class of combustion problem with shock layers is considered.A modified perturbation method is *** this simple and valid technique,we construct the boundary and the shock layers solution to the problem,and the asympt... 详细信息

关键词： singular perturbation burning problem asymptotic solution

A MULTIDIMENSIONAL CENTRAL LIMIT THEOREM WITH SPEED OF CONVERGENCE FOR AXIOM A DIFFEOMORPHISMS

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2011年第3期31卷 1123-1132页

作者：夏红强檀大耀 College of science Wuhan Textile University department of mathematics and computer science Qinzhou University

Let T：X → X be an Axiom A diffeomorphism,m the Gibbs state for a Hlder continuous function ɡ. Assume that f：X → R^d is a Hlder continuous function with ∫_X^（fdm） = *** the components of f are cohomologously independent, then there exists a positive definite symmetric matrix σ~2：=σ~2 （f ） such that S^fn √ n converges in distribution with respect to m to a Gaussian random variable with expectation 0 and covariance matrix σ~2 . Moreover, there exists a real number A 〉 0 such that, for any integer n ≥ 1,Π（ m＊（ 1√ nS f n ）,N （0,σ~2 ） ≤A√n, where m＊（1√ n S^fn）denotes the distribution of 1√ n S^fn with respect to m, and Π is the Prokhorov metric.

关键词： multidimensional central limit theorem Axiom A diffeomorphisms symbolic dynamics transfer operator