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International Workshop on Knowledge Discovery and Data Mining (WKDD)

作者： Jin-Ping Zuo Shu-Jin Tang Sch. of Math. & Phys. China Univ. of Geosci. Wuhan Grad. Coll. China Univ. of Geosci. Wuhan

This paper introduces the machine structure and control principle of 6-DOF motion platform based on PMAC and describes the key technology of PC programming, which is programmed by LabWindows/CVI. The NC system uses PM... 详细信息

关键词： Motion control Control systems Servomechanisms Valves Automatic control Sensor systems Geology Motion analysis Aerospace testing Robotic assembly

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Image Watermarking Algorithm Based on Quantization and Integer Wavelet Transform

Image Watermarking Algorithm Based on Quantization and Integ...

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Congress on Image and Signal Processing, CISP

作者： Chen Gang Ning Chen An-feng Hu Coll. of Math. & Comput. Sci. Jianghan Univ. Wuhan China Sch. of Inf. Sci. & Eng. Central South Univ. Changsha China

Geometric attacks are difficult to resist for watermarking algorithms. Although most existing geometric-resisted algorithms can resist some kinds of geometric attacks, however, their robustness to common image processing is weak. A watermarking algorithm which is both strongly robust to geometric attacks and common image processing was proposed in this paper. Watermarking messages combined a Gaussian-noise template were embedded to vertical high frequency coefficients which were produced by one-level integer wavelet transform of the host image. Then the same messages were embedded to each sub-image by quantization repeatedly. Two watermarking images were extracted by correlation calculation and majority rule. Finally, the ultimate watermarking was decided by a judge rule. Experiment results show the algorithm is both robust to geometric attacks and common image processing, meanwhile, the imperceptibility of the algorithm can meet the request.

关键词： Watermarking Quantization Wavelet transforms Image processing Resists Wavelet domain Noise robustness Image coding Pixel Educational institutions

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Hierarchical Control for Urban Traffic Trunk Roads Based on Multi-Agent

Hierarchical Control for Urban Traffic Trunk Roads Based on ...

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International Conference on Computational Intelligence and Software Engineering (CiSE)

作者： Guihong Zhu Yun Wei Dept. of Math. & Comput. Tongling Coll. Tongling China Sch. of Opt.-Electr. & Comput. Univ. of Shanghai for Sci. & Technol. Shanghai China

This paper applies the principle of hierarchical coordination, fuzzy control theory and rolling horizon technique in coordinated control of urban trunk. The trunk control model includes two layers, manipulative layer and coordinated layer, controlled by different agents with different strategy. The paper gives detail description of coordinated layer control model, which applies fuzzy algorithm for optimizing public signal cycle, and rolling horizon technique based on PSO for optimizing intersection green time. Simulation shows the proposed model has better performances than inductive-loop control model.

关键词： Road vehicles Traffic control Fuzzy control Control systems Intelligent control Cities and towns Optical control Optical computing math.matics Educational institutions

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Research on Properties of the Inverted Index for Photodetector Barrier Layer Capacitance

Research on Properties of the Inverted Index for Photodetect...

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Photonics and Optoelectronics, SOPO

作者： Junli Wan Shen Zheng Shuifa Sun Cheng Wan Coll. of Electr. Eng. & Inf. Technol. China Three Gorges Univ. Yichang China Sch. of Math. & Stat. Wuhan Univ. Wuhan China

For the design of high-speed photodetector, to reduce the junction capacitance C j and study the relationship between C j and reverse bias U B of the phototube is very important. Through substitution measurement of a group of standard capacitors, the function relationship of measuring voltage and capacitance has been established, and with the method of interpolation and least squares, the inverted exponential curve of junction capacitance and bias is obtained. Regression analysis demonstrates: For HFD1060 photodiode, the purpose that to effectively reduce junction capacitance can be easily achieved if bias ranges from 10 V to 15 V, and almost no change when U B is over 15 V. This method overcomes the effects of stray capacitance and circuit noise to measuring precision, which is mainly decided by the precision of standard capacitors.

关键词： Photodetectors Capacitance measurement Measurement standards Capacitors Photoelectricity Voltage measurement Interpolation Least squares methods Regression analysis Photodiodes

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Knowledge Management Performance Evaluation for Chinese Shipping Enterprise Based on Innovating Assets

Knowledge Management Performance Evaluation for Chinese Ship...

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International Workshop on Knowledge Discovery and Data Mining (WKDD)

作者： Dehai Liu Zhenfeng Liu Libo Qu Sch. of Math. & Quantitative Econ. Dongbei Univ. of Finance & Econ. Dongbei Transp. Manage. Coll. Dalian Maritime Univ. Dalian Financial Manage. Dept. Liaoning Inf. Vocational & Technol. Coll.

Along with information revolution and economy globalization, innovation assets becomes the core ability for shipping enterprises that could obtain the persistence competition dominance under the complex international shipping market. The paper puts forward the knowledge management performance evaluation index system for Chinese shipping enterprises based on the innovation assets, where includes technological innovation, organizational innovation and management innovation. The paper makes the questionnaire combining the open financial data choosing six typical shipping enterprises. At last, the paper uses DEA method to make the demonstration analysis. The result of principal component analysis and DEA analysis are beautifully validating the shipping enterprises competition evaluation index system based innovation assets.

关键词： Knowledge management Technological innovation Asset management Innovation management Technology management Forward contracts Data envelopment analysis Financial management Humans Shipbuilding industry

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Analysis and Modification on Existing Objective Weighting Methods in MADM

Analysis and Modification on Existing Objective Weighting Me...

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International Conference on Genetic and Evolutionary computing (WGEC)

作者： Huiyong Wang Shijie Tang Sch. of Math. & Comput. Sci. Guilin Univ. of Electron. Techonology Guilin China Coll. of Comput. & control Guilin Univ. of Electron. Techonology Guilin China

In this paper, we firstly introduce and analyze the problems in existing objective weighting methods in MADM. Then we propose some ideas of solutions for those questions. Finally, we give a feasible solution for deter... 详细信息

关键词： Decision making Dictionaries Genetics math.matics Educational institutions Surface acoustic waves Principal component analysis Statistical distributions Frequency

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Satellite Cloud Image Segmentation Based on the Improved Normalized Cuts Model

Satellite Cloud Image Segmentation Based on the Improved Nor...

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International Conference on Information Science and Engineering (ICISE)

作者： Wenlong Fei Hong Lv Zhihui Wei Sch. of Comput. Sci. & Technol. Nanjing Univ. of Sci. & Technol. Nanjing China Coll. of Math. & Phys. Nanjing Univ. of Inf. Sci. & Technol. Nanjing China

We propose a novel approach for satellite cloud image segmentation based on the improved Normalized Cuts Model. We extracted three important features from the multi-channel grayscale information and the texture features of satellite image, by the statistical analyses of the surface observation. Having set up the weight matrix by those features, we use the spectral graph theoretic framework of normalized cuts to find partitions of the satellite image, and estimate the cloud type of every partition. Experimental results on a satellite cloud image are shown.

关键词： Satellites Clouds Image segmentation Meteorology Pixel Weather forecasting Information science math.matical model Gray-scale Image analysis

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Efficient X-Ray Generation of Sm2+in Nanocrystalline BaFCl/Sm3+: A Photoluminescent X-Ray Storage Phosphor.

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ChemInform 2007年第45期38卷

作者： Hans Riesen Wieslaw A. Kaczmarek Sch. Phys. Environ. Math. Sci. Univ. Coll. Aust. Def. Force Acad. Univ. New South Wales Canberra A. C. T. 2600 Australia

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

关键词： luminescence, fluorescence (solids and liquids) display technology, phosphors, liquid crystals samarium, Sm barium, Ba halogens

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Multi-objective genetic algorithm based on a new model

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Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University 2005年第2期32卷 260-263+267页

作者： Liu, Chun-An Wang, Yu-Ping Sch. of Sci. Xidian Univ. Xi'an 710071 China Dept. of Math. Baoji Coll. of Arts and Sci. Baoji 721007 China

The rank and density of the population are first defined and then the density distribution variance and uniform distribution index function of solutions in objective space are clearly given. The rank is a measure of the quality of solutions, and the density distribution variance is a measure of the uniformity of the distribution of solutions. Using these two measures as two objective functions, the multi-objective optimization problem is finally converted into a two objective optimization problem. For the transformed problem, a novel genetic algorithm is proposed. In designing the algorithm, the uniform distribution index function is integrated into the mutation operator to adaptively adjust the search. As a result, the solutions will gradually move to the entire Pareto front and their distribution will gradually become uniform.

关键词： Genetic algorithms

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New (t, n) threshold signature sch.me withstanding the conspiracy attack

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Wuhan University Journal of Natural Sciences 2005年第1期10卷 107-110页

作者： Xie, Qi Yu, Xiu-Yuan Dept. of Math. Zhejiang Univ. Hangzhou 310027 China Sch. of Info. and Eng. Hangzhou Teachers Coll. Hangzhou 310012 China Hangzhou Teachers Coll. Hangzhou 310012 China

A conspiracy attack is proposed to show that Wang-Li's sch.me is insecure, because any/or more group members can impersonate other members to sign any message without holding the responsibility. To avoid the consp... 详细信息

关键词： Conspiracy attack Cryptography Identifier tracing Threshold signature

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