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Approximate computation of Madaline sensitivity based on discrete stochastic technique

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Science China(information Sciences) 2010年第12期53卷 2399-2414页

作者： ZHONG ShuiMing , ZENG XiaoQin, LIU HuiYi & XU Yan Institute of Pattern Recognition and Intelligent System, college of computer and information Engineering, Hohai University, Nanjing 210098, China 1. Institute of Pattern Recognition and Intelligent System College of Computer and Information Engineering Hohai University Nanjing 210098 China

The computation of the sensitivity of a Madaline’s output to its parameter perturbation is system- atically discussed. Firstly, according to the discrete feature of Adalines, a method based on discrete stochastic technique is proposed, which derives some analytical formulas for the computation of Adalines’ sensitivity. The method can theoretically solve some problems that are unsolvable by the existing methods based on continu- ous stochastic techniques, release some unpractical constraints, and make it available to theoretically analyze the approximation error of Adalines’ sensitivity. Secondly, on the basis of the sensitivity of Adalines and the structural characteristics of Madalines, a new selection strategy depending on a type of dedication degree for computing Madalines’ sensitivity is proposed, which is superior to current popular way of simply averaging in both precision and complexity. The proposed formulas and algorithm have the advantages of simplicity, low computational complexity, small approximation error, and high generality, as have been verified by a great amount of experimental simulations.

关键词： Adaline Madaline feedforward networks sensitivity parameter perturbation stochastic discrete technique

Design and Realization of a High-Precision Numerical Control Current Source

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微计算机信息 2008年第4期 180-182页

作者： CHEN MINGJIE WANG XIANGQIAO CAI ZHONGJIAN (college of computer and information Engineering, Chongqing Technology and Business University, CHONGQING, 400067)

The design adopts self-designed high accurate voltage source, Micro Control Unit (MCU), D/A converter and amplifier to control the on-state of Power MOS FET, to attain constant current. The closed loop system realizes constant current output of high-precision, presettable and step-by-step adjustable, and its output current data can be directly displayed by digital devices. Finally achieve a high-precision constant current source by locking output with closed hardware loop, closed software loop, software realtime integrating, real-time filtering. The role of software is to compensate the temperature variance of sampling resistances by data segment interpolation, while the linear interpolation compensation is applied to intersegments, which improves the output precision further. It has advantages on high precision, simple construction, performance stable, easy operation, low cost and loaded capability.

关键词： Current source Voltage source MCU

A new algorithm for degree-constrained minimum spanning tree based on the reduction technique

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Progress in Natural Science:Materials International 2008年第4期18卷 495-499页

作者： Aibing Ning a, Liang Ma a, Xiaohua Xiong b a School of Management, University of Shanghai for Science and Technology, Shanghai 200093, China b college of computer and information, Shanghai Second Polytechnic University, Shanghai 201209, China School of Management University of Shanghai for Science and Technology Shanghai 200093 China college of computer and information Shanghai Second Polytechnic University Shanghai 201209 China

The degree-constrained minimum spanning tree (DCMST) is an NP-hard problem in graph theory. It consists of finding a spanning tree whose vertices should not exceed some given maximum degrees and whose total edge length is minimal. In this paper, novel math- ematical properties for DCMST are indicated which lead to a new reduction algorithm that can significantly reduce the size of the prob- lem. Also an algorithm for DCMST to solve the smaller problem is presented which has been preprocessed by reduction algorithm.

关键词： Degree-constrained minimum spanning tree Reduction algorithm Edge exchange technique Combinatorial optimization

POSITIVE ENTIRE SOLUTIONS TO NON-LINEAR p-LAPLACE SYSTEMS

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Annals of Differential Equations 2008年第4期24卷 451-456页

作者： Xu Jianrong (college of computer and information, Fujian Agriculture and Forestry University, Fuzhou 350002)

We consider the N-dimensional singular p-Laplace systems and obtain some sufficient conditions which guarantee that the system has infinitely many radial positive entire asymptotic solutions.

关键词： positive entire solution singular p-Laplace systems fixed point theorem

维普期刊数据库

ON THE ALMOST PERIODIC KOLMOGOROV COMPETITIVE SYSTEMS WITH FEEDBACK CONTROLS

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Annals of Differential Equations 2008年第3期24卷 261-269页

作者： Lai Weiying (college of computer and information, Fujian Agriculture and Forestry University, Fuzhou 350002)

In this paper, we consider an almost periodic multi-species Kolmogorov type com-petitive system with feedback controls. Applying Schauder’s fixed point theorem, a criterion on the existence of the positive almost per... 详细信息

关键词： Kolmogorov system Schauder’s fixed point theorem almost periodic solution competition feedback controls

维普期刊数据库

Contourlet HMT model with directional feature

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Science China(information Sciences) 2012年第7期55卷 1563-1578页

作者： WANG XiangHai 1,2,3 ,CHEN MingYing 1 ,SONG ChuanMing 1,2 ,XU MengChun 1 & FANG LingLing 3 1 college of computer and information Technology,Liaoning Normal University,Dalian 116029,China 2 State Key Laboratory for Novel Software Technology,Nanjing University,Nanjing 210093,China 3 Provincial Key Laboratory for computer information Processing Technology,Soochow University,Suzhou 215006,China 1. college of computer and information Technology Liaoning Normal University Dalian 116029 China2. State Key Laboratory for Novel Software Technology Nanjing University Nanjing 210093 China3. Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou 215006 China

According to Shanno's information theory,the directional feature of texture is defined as the value of directional variable when an image signal attains a singularity of random *** terms of this definition,we calculate the texture's directional features using Tamura's method and study the directional probability distribution of Contourlet *** we find that the directional features tend to be conveyed across parent and child *** on this conclusion,we establish a novel probability distribution model of hidden direction variables under the condition of hidden state variable's distribution,named Contourlet HMT model with directional *** structure and training method of the model are presented as ***,an unsupervised context-based image segmentation algorithm is proposed on the basis of the proposed *** effectiveness is verified via extensive experiments carried out on several synthesized images and remote sensing images.

关键词： directional feature Contourlet HMT Contourlet HMT with directional feature unsupervised texture segmentation

A Threshold Proxy Signature Scheme based on Bilinear Parings

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A Threshold Proxy Signature Scheme based on Bilinear Parings

Color Image Encryption Based on Fractional Fourier Transform

2010 IEEE 2nd Symposium on Web Society

作者： Feng Xu college of computer and information,Hohai University Nanjing University Nanjing,China Xin Lv college of computer and information,Hohai University Nanjing,China

＜正＞Aiming at the technology of threshold proxy signature is not yet perfect,there are still several problems about security and performance,the paper introduces bilinear pairings to signature scheme, suggests a threshold proxy signature scheme based on new probability *** scheme not only has all properties that a strongly-secure threshold proxy signature scheme should has,but also has short length of secret key and fast speed of encryption comparing with present schemes.

关键词： threshold proxy signature bilinear pairings probability signature scheme VSS

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Color Image Encryption Based on Fractional Fourier Transform

EVALUATION OF LOGISTICS information SYSTEM FOR E-BUSINESS

2010 Second ETP/IITA World Congress in Applied Computing, computer Science, and computer Engineering(ACC 2010)

作者： DELONG CUI college of computer and Electronic information Maoming University Guangdong Maoming CHINA

In order to cope with the shortage of present image encryption algorithm, a novel color image encryption algorithm based on chaotic system and fractional Fourier transform is proposed in this paper. The image encryption process includes three steps: first the RGB color components of the input image are permuted and transformed into YCbCr color space. Then every component of YCbCr is encrypted by employing Fractional Fourier domain double random phase. Finally the every components of confusion image is encrypted by using confusion matrix which is generated by chaotic system, and the cipher image is obtained by composing the encrypted contents. The security of the proposed algorithm depends on the sensitivity to the randomness of phase mask, the orders of FRFT and the initial conditions of chaotic system. Theoretical analysis and experimental results demonstrate that the algorithm is favorable.

关键词： information security color image encryption fractional Fourier transform double random phase chaotic system confusion matrix

来源： cnki会议评论

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EVALUATION OF LOGISTICS INFORMATION SYSTEM FOR E-BUSINESS