检索结果-南通市图书馆

Singular Integral Equations with Cosecant Kernel in Solutions with Singularities of High Order

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Wuhan university Journal of Natural Sciences 2005年第2期10卷 339-343页

作者： HAN Hui-li 1,2 ,DU Jin-yuan 1,3 1. school of mathematics and Statistics, Wuhan university, Wuhan 430072, Hubei, china 2. school of mathematics and computer, Ningxia university, Yinchuan 750021, Ningxia, china 3. Department of mathematics, Hubei Institute for Nationalities, Enshi 445000, Hubei, china Wuhan university School of Mathematics and Statistics Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***) Ningxia university School of Mathematics and Computer Yinchuan Ningxia China (GRID:grid.260987.2) (ISNI:***) Wuhan university School of Mathematics and Statistics Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***) Hubei Institute for Nationalities Department of Mathematies Enshi Hubei China (GRID:grid.34418.3a) (ISNI:***)

We have discussed and solved the boundary value problem with period 2aπ and the singular integral equation with kernel csc t-tv/a in solution having singularities of high order, where the smooth contour of integratio... 详细信息

关键词： boundary value problem singular integral equation the singularities of high order

Algorithm of simulation time synchronization over large-scale nodes

在线全文

学校读者我要写书评

暂无评论

Science in china(Series F) 2008年第9期51卷 1239-1255页

作者： ZHAO QinPing1,2,ZHOU Zhong1,2 & Lü Fang1,2 1 State Key Laboratory of Virtual Reality Technology and Systems,Beihang university,Beijing 100083,china 2 school of computer Science and engineering,Beihang university,Beijing 100083,china State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100083 China school of computer Science and engineering Beihang University Beijing 100083 China

In distributed simulation, there is no uniform physical clock. And delay cannot be estimated because of jitter. So simulation time synchronization is essential for the event consistency among nodes. This paper investigates time synchronization algorithms over large-scale distributed nodes, analyzes LBTS （lower bound time stamp） computation model described in IEEE HLA standard, and then presents a grouped LBTS model. In fact, there is a default premise for existing algorithms that controi packets must be delivered via reliable transportation. Although, a theorem of time synchronization message＇s reliability is proposed, which proves that only those control messages that constrain time advance need reliability. It breaks out the default premise for reliability. Then multicast is introduced into the transmis- sion of control messages, and algorithm MCTS （multi-node coordination time synchronization） is proposed based on multicast. MCTS not only promotes the time advance efficiency, but also reduces the occupied network bandwidth. Experiment results demonstrate that the algorithm is better than others in both time advance speed and occupied network bandwidth. Its time advance speed is about 50 times per second when there are 1000 nodes, approximately equal to that of similar systems when there are 100 nodes.

关键词： distributed simulation time synchronization multi-node coordination LBTS multicast

A Hybrid of Theorems of Goldbach and Piatetski-Shapiro

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of mathematics,Series B 2006年第3期27卷 341-352页

作者： Xianmeng MENG Mingqiang WANG school of computer Science and Technology, Shandong university, Jinan 250100, china Department of Statistics and mathematics, Shandong Finance Institute, Jinan 250014, china. school of computer Science and Technology, Shandong university, Jinan 250100, china Department of mathematics, Qufu Normal university, Qufu 273165, Shandong, china. school of computer Science and Technology Shandong University Jinan 250100 China Department of Statistics and mathematics Shandong Finance Institute Jinan 250014 China Department of mathematics Qufu Normal University Qufu 273165 Shandong China

It is proved that for almost all sufficiently large even integers n, the prime variable equation n = p1 ＋ p2, p1 ∈ Pγ is solvable, with 13/15 〈γ≤ 1, where Pγ = {p ｜p = [m^1/γ], for integer m and prime p} is t... 详细信息

关键词： Circle method Sieve method Goldbach problem

Selection of unitary operations in quantum secret sharing without entanglement

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2011年第9期54卷 1837-1842页

作者： XU Juan 1,CHEN HanWu 1,LIU WenJie 1,2 & LIU ZhiHao 1 1 school of computer Science and engineering,Southeast university,Nanjing 210096,china 2 school of computer and Software,Nanjing university of Information Science and Technology,Nanjing 210044,china 1. school of computer Science and engineering Southeast University Nanjing 210096 China2. School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 China

We propose a substitute-Bell-state attack strategy for quantum secret sharing schemes without entanglement,as well as a definition of the minimum failure probability of such attack strategy.A quantitative analysis of security degrees corresponding to different unitary operations is also provided,when the secret sharing schemes without entanglement are stricken by substitute-Bell-state *** a result,the relation between the selection of unitary operations and the effect of substitute-Bell-state attack is shown,which can serve as an important guidance for the selection of unitary operations in designing and implementing quantum secret sharing schemes.

关键词： quantum secret sharing substitute-Bell-state attack unitary operation minimum failure probability

Dynamic scheduling model of computing resource based on MAS cooperation mechanism

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science in china(Series F) 2009年第8期52卷 1302-1320页

作者： JIANG WeiJin1,2, ZHANG LianMei3 & WANG Pu4 1 school of computer and Electronic engineering, Hunan university of Commerce, Changsha 410205, china 2 school of Information engineering, Xiangtan university, Xiangtan 411000, china 3 Electrical engineering College, Wuhan university, Wuhan 430072, china 4 school of Commerce, Central South university, Changsha 410083, china 1. school of computer and Electronic engineering Hunan University of Commerce Changsha 410205 China 2. school of Information engineering Xiangtan University Xiangtan 411000 China 3. Electrical engineering College Wuhan University Wuhan 430072 China 4. school of Commerce Central South University Changsha 410083 China

Allocation of grid resources aims at improving resource utility and grid application performance. Currently, the algorithms proposed for this purpose do not fit well the autonomic, dynamic, distributive and heterogeneous features of the grid environment. According to MAS （multi-agent system） cooperation mechanism and market bidding game rules, a model of allocating allocation of grid resources based on market economy is introduced to reveal the relationship between supply and demand. This model can make good use of the studying and negotiating ability of consumers＇ agent and takes full consideration of the consumer＇s behavior, thus rendering the application and allocation of resource of the consumers rational and valid. In the meantime, the utility function of consumer is given; the existence and the uniqueness of Nash equilibrium point in the resource allocation game and the Nash equilibrium solution are discussed. A dynamic game algorithm of allocating grid resources is designed. Experimental results demonstrate that this algorithm diminishes effectively the unnecessary latency, improves significantly the smoothness of response time, the ratio of throughput and resource utility, thus rendering the supply and demand of the whole grid resource reasonable and the overall grid load balanceable.

关键词： multi-agent system (MAS) resource scheduling model evolutionary game cooperation mechanism utility function

A NUMERICAL SIMULATION OF 3-D INNER FLOW IN UP-STREAM PUMPING MECHANICAL SEAL

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2006年第5期18卷 572-577页

作者： ZHANG Jin-feng YUAN Shou-qi FU Yong-hong FANG Yu-jian Research Center of Fluid Machinery engineering and Technology Jiangsu University Zhenjiang 212013 China school of Mechanical engineering Jiangsu University Zhenjiang 212013 China school of Energy and Environment Xihua University Chengdu 610039 China

Numerical simulation of 3-D inner flow between Up-stream Pumping Mechanical Face Seals （UPMFS） faces was initially done by CFD software, which made the flow visualization come true. Simulation results directly discover the action of hydrodynamic lubrication, and by comparison with that of Conventional Mechanic Face Seals （CMFS）, the advantage over bigger bearing capability, less friction and much less leakage are explained clearly. Otherwise there are also some different ideas and results from precedent analysis and computational research results： dynamic and static pressure profiles can be obtained respectively instead of the analytic total pressure distribution only, pressure distribution is nonlinear, while always be solved as linear, lower pressure is observed at the area of inner diameter caused by the grooves, but its possible cavitations effects to the performance of UPMFS still need further study.

关键词： Up-stream (UPMFS) Conventional hydrodynamic lubrication simulation Pumping Mechanical Face Seals Mechanic Face Seals (CMFS) visualization of flow numerical simulation

Subcategories of fixed points of mutations in root categories with type _(n-1)

在线全文

学校读者我要写书评

暂无评论

Science china mathematics 2010年第12期53卷 3057-3066页

作者： LIN YaNan1 & TANG LiDan1,2,1school of Mathematical Sciences, Xiamen university, Xiamen 361005, china 2College of mathematics and computer Science, Fuzhou university, Fuzhou 350108, china 1. school of Mathematical Sciences Xiamen University Xiamen 361005 China2. College of Mathematics and Computer Science Fuzhou University Fuzhou 350108 China

For any n 3, let R(n) denote the root category of finite-dimensional nilpotent representations of cyclic quiver with n vertices. In the present paper, we prove that R(n-1) is triangle-equivalent to the subcategory of fixed points of certain left (or right) mutation in R(n). As an application, it is shown that the affine Kac-Moody algebra of type n-2 is isomorphic to a Lie subalgebra of the Kac-Moody algebra of type n-1.

关键词： subcategory of fixed points root category Lie algebra

Weighted composition operators between μ-Bloch spaces on the unit ball

在线全文

学校读者我要写书评

暂无评论

Science china mathematics 2005年第10期48卷 1349-1368页

作者： ZHANG Xuejun~1 & XIAO Jianbin~2 1. College of mathematics and computer Science,Hunan Normal university,Changsha 410006,china(email:xuejunttt@263. net) 2. The school of Science,Hangzhou Dianzi university,Hangzhou 310037,china 1. College of mathematics and computer Science Hunan Normal University 410006 Changsha China 2. The school of Science Hangzhou Dianzi University 310037 Hangzhou China

In this paper,necessary and sufficient conditions are given for the weighted composition operator T_(ψ,ψ) to be bounded or compact from the space β_μ to β_ν (or β_(μ,0) to β_(ν,0) ) on the unit ball of C^***... 详细信息

关键词： μ-Bloch space, weighted composition operator, boundedness, compactness.

Image denoising and deblurring: non-convex regularization, inverse diffusion and shock filter

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2011年第6期54卷 1184-1198页

作者： FU ShuJun 1,2,3 , ZHANG CaiMing 2 & TAI XueCheng 3,4 1 school of mathematics, Shandong university, Jinan 250100, china 2 school of computer Science and Technology, Shandong university, Jinan 250101, china 3 school of Physical and Mathematical Sciences, Nanyang Technological university, Singapore 639798, Singapore 4 Department of mathematics, university of Bergen, Bergen 5008, Norway 1. school of mathematics Shandong University Jinan 250100 China2. School of Computer Science and Technology Shandong University Jinan 250101 China3. School of Physical and Mathematical Sciences Nanyang Technological University Singapore 639798 Singapore4. Department of Mathematics University of Bergen Bergen 5008 Norway

A large number of applications in image processing and computer vision depend on image quality. In this paper, main concerns are image denoising and deblurring simultaneously in a restoration task by three types of methodologies: non-convex regularization, inverse diffusion and shock filter. We discuss their relations in the context of image deblurring: the inverse diffusion implied by the non-convex regularization, and the superior ability of deblurring edge of the shock filter to that of the inverse diffusion, both in 1D and 2D cases. Finally, we propose a region-based adaptive anisotropic diffusion with shock filter method, which shows advantages of deblurring edges, denoising and smoothing contours in experiments, compared with some related methods. Therein an idea of "divide and rule" is introduced.

关键词： image denoising image deblurring non-convex regularization inverse diffusion shock filter adaptive anisotropic diffusion