检索结果-南通市图书馆

Dromion Solutions for Dispersive Long-wave Equations in Two Space Dimensions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Communications in Nonlinear science and Numerical Simulation 1997年第4期2卷 225-229页

作者： Yanjuan ZHU (department of Mathematics &Physics,Guangdong university of technology,Guangzhou 5 1 0 0 90 ,china) Jiefang ZHANG (Research Center of Engineering science,zhejiang university of technology,hangzhou 31 0 0 32 ,china Institute of Nonlinear department of Mathematics and Physics Guangdong University of Technology Guangzhou 510090 China Research Center of Engineering science Zhejiang University of Technology Hangzhou 310032 China Institute of Nonlinear Physics / department of Physics Zhejiang Normal University Jinhua 321004 Zhejiang China

By using the homogeneous balance method,we show that the dromion solutions exist for the (2 + 1 ) - dimensional dispersive long- wave *** conjectured thatthe method used here can be generalized to a class of nonlinear... 详细信息

关键词： dromiom solution soliton solution dispersive long- wave eqaution.

Technical framework for Internetware: An architecture centric approach

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) 2008年第6期51卷 610-622页

作者： YANG FuQing1,2, Lü Jian3,4 & MEI Hong1,2 1 Key Laboratory of High Confidence Software Technologies (Peking university), Ministry of Education, Beijing 100871, china 2 School of Electronics Engineering and computer science, Peking university, Beijing 100871, china 3 State Key Laboratory for Novel Software technology, Nanjing 210093, china 4 department of computer science and technology, Nanjing university, Nanjing 210093, china 1. Key Laboratory of High Confidence Software Technologies (Peking university) Ministry of Education Beijing 100871 China 2. School of Electronics Engineering and computer science Peking University Beijing 100871 China 3. State Key Laboratory for Novel Software technology Nanjing 210093 China 4. department of computer science and technology Nanjing University Nanjing 210093 China

Being a new software paradigm evolved by the Internet, Internetware brings many challenges to the traditional software methods and techniques. Sponsored by the national basic research program （973）, researchers in china have developed an architecture centric technical framework for the definition, incarnation and engineering of Internetware. First of all, a software model for Internetware is defined for what to be, including that Internetware entities should be packaged as components, behaving as agents, interoperating as services, collaborating in a structured and on demand manner, etc. Secondly, a middleware for Internetware is designed and implemented for how to be, including that Internetware entities are incarnated by runtime containers, structured collaborations are enabled by runtime software architecture, Internetware can be managed in a reflective and autonomic manner, etc. Thirdly, an engineering methodology for Internetware is proposed for how to do, including the way to develop Internetware entities and their collaborations by transforming and refining a set of software architectures which cover all the phases of software lifecycle, the way to identify and organize the disordered software assets by domain modeling, etc.

关键词： Internetware component software architecture agent middleware

l-SkyDiv query:Effectively improve the usefulness of skylines

在线全文

学校读者我要写书评

暂无评论

science china(Information sciences) 2010年第9期53卷 1785-1799页

作者： HUANG ZhenHua1,2*,XIANG Yang1 & LIN ZiYu3 1department of computer science and technology,Tongji university,Shanghai 201804,china 2The Key Laboratory of Embedded System and Service Computing,Ministry of Education,Tongji university,Shanghai 200092,china 3department of computer science and technology,Peking university,Beijing 100871,china 1. department of computer science and technology Tongji University Shanghai 201804 China2. The Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 200092 China3. Department of Computer Science and Technology Peking University Beijing 100871 China

Skyline query processing has recently received a lot of attention in database *** a set of multi-dimensional objects,the skyline query finds the objects that are not dominated by *** the best of our knowledge,the existing researches mainly focus on how to efficiently return the whole skyline ***,as the cardinality and dimensionality of input dataset increase,the number of skylines grows exponentially,and hence this "huge" skyline set is completely useless to *** by the above fact,in this paper,we present a novel type of l-SkyDiv query,which only returns l skylines having maximum diversity,to improve the usefulness of skyline ***,we prove that the l-SkyDiv query belongs to the NP-Hard problem theoretically,and propose three efficient heuristic algorithms whose time complexities are polynomial to fast implement the proposed ***,we present detailed theoretical analyses and extensive experiments,demonstrating that our algorithms are both efficient and effective.

关键词： skyline query diversity heuristic algorithm query optimization performance evaluation

Robust H-infinity fuzzy control for uncertain Markovian jump nonlinear singular systems with wiener process

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2010年第2期8卷 205-210页

作者： Aiqing ZHANG 1 , Huajing FANG 2 (1.College of Mathematics and computer science, Jianghan university, Wuhan Hubei 430056, china 2.department of Control science and Engineering, Huazhong university of science and technology, Wuhan Hubei 430074, china) College of Mathematics and computer science Jianghan University Wuhan Hubei China department of Control science and Engineering Huazhong University of Science and Technology Wuhan Hubei China

This paper deals with the problems of robust stochastic stabilization and H-infinity control for Markovian jump nonlinear singular systems with Wiener process via a fuzzy-control approach. The Takagi-Sugeno (T-S) fuzzy model is employed to represent a nonlinear singular system. The purpose of the robust stochastic stabilization problem is to design a state feedback fuzzy controller such that the closed-loop fuzzy system is robustly stochastically stable for all admissible uncertainties. In the robust H-infinity control problem, in addition to the stochastic stability requirement, a prescribed performance is required to be achieved. Linear matrix inequality (LMI) sufficient conditions are developed to solve these problems, respectively. The expressions of desired state feedback fuzzy controllers are given. Finally, a numerical simulation is given to illustrate the effectiveness of the proposed method.

关键词： Fuzzy control H-infinity control Singular systems Stochastic stability Linear matrix inequality (LMI)

Polymerization of Styrene and 1,3-Butadiene by Catalyst Systems Based on Calix[4]arene Neodymium Complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1999年第7期10卷 597-600页

作者： Yan Song ZHENG Zhi Quan SHEN(department of Chemistry, Huazhong university of science and technology wuhan 430074)(Institute of Polymer sciences and Materials, zhejiang university hangzhou 310027) Huazhong Univ Sci & Technol Dept Chem Wuhan 430074 Peoples R China zhejiang Univ Inst Polymer Sci & Mat Hangzhou 310027 Peoples R China

Polymerization of styrene and 1,3-butadiene were performed by calix[4]arene-neodymium complexes using di-n-butylmagnesium and tri-iso-butylaluminum as cocatalyst respectively. The effect of the substituent groups in c... 详细信息

关键词： calixarene-neodymium complexes polymerization catalyst

Presenting degenerate Ringel-Hall algebras of type B

在线全文

学校读者我要写书评

暂无评论

science china Mathematics 2012年第5期55卷 949-960页

作者： FAN LiJuan1 & ZHAO ZhongHua2,1department of Mathematics,Beijing Normal university,Beijing 100875,china 2department of Mathematics and computer science,School of science,Beijing university of Chemical technology,Beijing 100029,china 1. department of Mathematics Beijing Normal University Beijing 100875 China2. Department of Mathematics and Computer Science School of Science Beijing University of Chemical Technology Beijing 100029 China

We give a presentation for the degenerate Ringel-Hall algebras of type B by studying the corresponding generic extension monoid *** an application,it is shown that the degenerate Ringel-Hall algebras of type B admit m... 详细信息

关键词： degenerate Ringel-Hall algebras generic extension monoid algebras Auslander-Reiten quivers Frobenius morphism

A Method for Generating Super Large Fractal Images Useful for Decoration Art

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Communications in Nonlinear science and Numerical Simulation 1996年第3期1卷 24-27页

作者： Huajie LIU Jun LUO(Research Center for science & Society Peking university, P.R.china)(department of computer science & technology, Peking university, P.R.china) [b] Research Center for science & Society Peking university P.R. china [a] department of computer science & technology Peking university P.R. china

Many authors have reported the techniques to iterate nonlinear equations oncomplex plane, but generally, the sise of image calculated by usual VGA style (640×480) istoo small to fit the needs for high quality publications or decorative patterus. We describea universal method for generating and storing (in *.GIF format) fractal forge large enoughas you need, such as an wie 5000×5000 256-color(25,000, 74 bytes 23.8MB), whichcan thoroughly display the intricate beauty of fractals.

关键词： super large fractal images iteration decoration art

Image universal steganalysis based on best wavelet packet decomposition

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(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 1. Information science and technology Institute Zhengzhou 450002 China2. Department of Computer Science and Technology Tsinghua University Beijing 100084 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

Robust Stability Analysis for Linear Time-delay Systemswith Uncertain Parameters: LMI Approach

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Systems science and Systems Engineering 1999年第1期9卷 22-26页

作者： YU Li(department of Automation, zhejiang university of technology,hangzhou 310032,china)

In this paper, a delay-independent sufficient condition for the stability of linear timedelay systems with uncertain parameters is given in terms of linear matrix inequalities (LMIs). Basedon that, a convex optimization problem is formulated to And the bounds on the uncertain parameterswhich guarantee the stability of the uncertain *** examples are given to illustrate theresults.

关键词： :robust stabilitry delay LMI