检索结果-南通市图书馆

science China Mathematics 2011年第3期54卷 587-602页

作者： HU GuoEn1 & LU ShanZhen2 1department of Applied Mathematics, Zhengzhou information science and Technology Institute, Zhengzhou 450002, China 2department of Mathematics, Beijing Normal University, Beijing 100875, China department of Applied Mathematics Zhengzhou Information Science and Technology Institute Zhengzhou China department of Mathematics Beijing Normal University Beijing China

In this paper, by sharp function estimates and certain weak type endpoint estimates, the authors establish some weighted norm inequalities with Ap weights for the multilinear singular integral operators with non-smoot... 详细信息

关键词： approximation to the identity weighted norm inequality singular integral operator non-smooth kernel Calderón-Zygmund decomposition

A relationship between the nonexistence of generalized bent functions and class groups

在线全文

学校读者我要写书评

暂无评论

science China Mathematics 2010年第1期53卷 213-222页

作者： LIU FengMei 1,& YUE Qin 21 department of information Research,College of information Engineering,information Engineering University,Zhengzhou 450002,China 2 department of Mathematics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China department of information Research College of Information Engineering Information Engineering University Zhengzhou China department of Mathematics Nanjing University of Aeronautics and Astronautics Nanjing China

A new result on the nonexistence of generalized bent functions is presented by using properties of the decomposition law of primes in cyclotomic fields and properties of solutions of some Diophantine equations. At the same time,a method is given which can be used to simplify the known results. Then we give the bounds and the meaning in algebraic number theory of the parameters in our results.

关键词： generalized bent function integral basis class group genus theory

EXISTENCE AND NONEXISTENCE OF GLOBAL SOLUTIONS OF THE INITIAL-BOUNDARY VALUE PROBLEM FOR SOME DEGENERATE HYPERBOLIC EQUATION

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2005年第4期25卷 703-709页

作者：叶耀军 department of information and computational science Henan Agricultural University Zhengzhou 450002 ChinaThe Graduate School of China Academy of Engineering Physics P.O.Box 2101 Beijing 100088 China

The author considers the global existence and global nonexistence of the initial-boundary value problem for some degenerate hyperbolic equation of the form utt- div（｜△↓｜^P-2 △↓u）=｜u｜^m u, （x,t）∈[0, ＋∞） ×Ω with p 〉 2 and m 〉 0. He deals with the global solutions by ***＇s potential well ideas. At the same time, when the initial energy is positive, but appropriately bounded, the global nonexistence of solutions is verified by using the analysis method.

关键词： Degenerate hyperbolic equations global existence and global nonexistence,initial-boundary value problem

A new smoothing scheme for mathematical programs with complementarity constraints

在线全文

学校读者我要写书评

暂无评论

science China Mathematics 2010年第7期53卷 1881-1890页

作者： YAN Taodepartment of information and computational sciences, College of science, Nanjing University of science and Technology, Nanjing 210094, China department of information and computational sciences College of Science Nanjing University of Science and Technology Nanjing China

In this paper, we consider a mathematical program with complementarity constraints (MPCC). We present a new smoothing scheme for this problem, which makes the primal structure of the complementarity part unchanged mostly. For the new smoothing problem, we show that the linear independence constraint qualification (LICQ) holds under some conditions. We also analyze the convergence behavior of the smoothing problem, and get some sufficient conditions such that an accumulation point of stationary points of the smoothing problems is C (M, B)-stationarity respectively. Based on the smoothing problem, we establish an algorithm to solve the primal MPCC problem. Some numerical experiments are given in the paper.

关键词： mathematical program with complementarity constrains MPEC-LICQ B-stationarity C-stationarity M-stationarity

Image universal steganalysis based on best wavelet packet decomposition

在线全文

学校读者我要写书评

暂无评论

science China(information sciences) 2010年第3期53卷 634-647页

作者： LUO XiangYang1,2, LIU FenLin1, YANG ChunFang1 & WANG DaoShun2 1information science and Technology Institute, Zhengzhou 450002, China 2department of Computer science and Technology, Tsinghua University, Beijing 100084, China information science and Technology Institute Zhengzhou China department of Computer science and Technology Tsinghua University Beijing China

Based on the best wavelet packet decomposition of images, a new universal steganalysis method with high detection correct ratio is proposed. First, the best wavelet packet decomposition of image based on the Shannon entropy information cost function is made. Second, high order absolute characteristic function moments of histogram extracted from the coefficient subbands obtained by best wavelet packet decomposition are regarded as features. Finally, these features are processed and a back-propagation (BP) neural network is designed to classify original and stego images. Three different steganalysis algorithms for three different cases of background and application condition are presented. To validate the performance of the proposed method, a series of experiments are made for six kinds of typical steganography methods, i.e. LSB, LTSB, PMK, Jsteg, F5 and JPHide. Results show that, the average detection accuracy of the proposed method exceeds at least 6.4% and up to 15.4% and has a better universal performance than its closest competitors. Furthermore, the proposed method can provide reference for designing the pattern recognition and classification algorithm based on best wavelet packet decomposition.

关键词： steganography digital images universal steganalysis best wavelet packet decomposition BP neural network

Weighted norm inequalities for the multilinear Calderón-Zygmund operators

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 China Mathematics 2010年第7期53卷 1859-1872页

作者： HU GuoEn department of Applied Mathematics, Zhengzhou information sciences and Technology Institute,Zhengzhou 450002, China department of Applied Mathematics Zhengzhou Information Sciences and Technology Institute Zhengzhou China

In this paper, by proving some suitable weighted endpoint estimates, and then by multilinear interpolation and a new multilinear extrapolation lemma, the author establishes some weighted estimates for the multilinear ... 详细信息

关键词： multilinear Calderón-Zygmund operator commutator weighted norm inequality interpolation extrapolation

Wave mechanics in quantum phase space: hydrogen atom

在线全文

学校读者我要写书评

暂无评论

Progress in Natural science:Materials International 2007年第2期17卷 144-149页

作者： LU Jun ( department of Foundational science, Beijing Union University, Beijing 100101, China department of computational science, National University of Singapore, Singapore 117543, Singapore) department of Foundational science Beijing Union University Beijing 100101 China department of computational science National University of Singapore Singapore 117543 Singapore

The rigorous solutions of the stationary Schrodinger equation for hydrogen atom are solved with the wave-mechanics method within the framework of the quantum phase-space representation established by Torres-Vega and Frederick. The "Fourier-like" projection transformations of wave function from the phase space to position and momentum spaces are extended to three-dimensional systems. The eigenfunctions in general position and momentum spaces could be obtained through the transformations from eigenfunction in the phase space.

关键词： quantum phase space hydrogen atom projection transformation.

Distribution of 0 and 1 in the highest level of primitivesequences over Z/(2~e) (Ⅱ)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese science Bulletin 1998年第8期43卷 633-635页

作者： QI Wenfeng and ZHOU Jinjun department of Applied Mathmatics, Zhengzhou information Engineering Institute, Zhengzhou 450002, China department of Applied Mathmtics Zhengzhou Information Engineering Institute Zhmgzhou China

The distribution of 0 and 1 is studied in the highest level a e-1of primitive sequences over Z/(2\+e). It is proved that the proportion of 0 (or 1) in one period of a e-1is between 40% and 60% for e≥8.

关键词： linear recurring sequence primitive sequence highest levelZ sequence distribution of 0 and 1.

From Workflow to Interworkflow

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural sciences 2001年第Z1期6卷 63-71页

作者： Kenichi Okada 1, Haruo Hayami 2, Kimiyo Sagehashi 3 1 department of information and Computer science, Faculty of science & Technology Keio University 3 14 1Hiyoshi, Kohoku ku,Yokohama 223 8522, Japan 2 department of information and Computer S department of information science Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan

Workflow management systems are being introduced in many organizations to automate the business process. The initial emphasis of introducing a workflow management system is on its application to the workflow in a given organization. The next step is to interconnect the workflow across organizations. We call it interworkflow, and the total support technologies, which are necessary for its realization, interworkflow management mechanism. Interworkflow is being expected as a supporting mechanism for Business to Business Electronic Commerce. We had proposed this management mechanism and confirmed its realization with the prototype. At the same time, the interface and the protocol for interconnecting heterogeneous workflow management systems has been standardized by the WfMC. So, we advance the project of the implementation of interworkflow management system for the practical use and its experimental proof.

关键词： workflow interworkflow business to business electronic commerce WfMC