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Preparation of well-defined polystyrene/silica hybrid nanoparticles by ATRP

science China Chemistry 2008年第1期51卷 51-57页

作者： OU BaoLi1,2 LI DuXin2 1 college of Chemistry and Chemical engineering,hunan university of science and technology,xiangtan 411201, China 2 State Key Laboratory of Powder Metallurgy,Central South university,Changsha 410083, China 1. College of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 411201 China 2. State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China

Immobilization of the atom transfer radical polymerization (ATRP) macroinitiators at the silica nanoparticle surfaces was achieved through surface modification with excess toluene-2,4-diisocynate (TDI), after which the residual isocyanate groups were converted into ATRP macroinitiators. Structurally well-defined polystyrene chains were grown from the nanoparticle surfaces to yield individual particles composed of a silica core and a well-defined, densely grafted outer polystyrene by ATRP, which was initiated by the as-synthesized silica-based macroinitiator. FTIR, NMR and gel permeation chro-matography (GPC) were used to characterize the polystyrene/silica hybrid particles.

关键词： silica nanoparticles surface modification atom transfer radical polymerization polystyrene hybrid particle

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IISA: An inter-cluster and intra-cluster scheduling algorithm cluster-based for wireless sensor network

IISA: An inter-cluster and intra-cluster scheduling algorith...

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2008 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2008

作者： Xin-Lian, Zhou Jian-Bo, Xu School of Information Science and Engineering Central South University Changsha Hunan Province 410000 China School of Computer Science and Engineer Hunan University of Science and Technology University Xiangtan Hunan Province 411201 China

ISBN: (纸本)9781424421084

the MAC based on competition doesn't do any contribution in the energy savings, because it will lead to conflict, crosstalk, idle intercept and control expenses in communication. TDMA scheduling system based on the structure of cluster can effectively improve the scalability, save energy and does not increase node costs, but it also brought transmission interference between clusters. We proposed an Inter -cluster and Intra-cluster TDMA Scheduling Algorithm cluster-based (IISA), each round of data collection time is divided by layers along down the data aggregation tree, each cluster node in the pool tree preserves its initial allocation work time and time control of the son tree. Nodes in accordance with their own work TDMA initial time can transmit data without any collision conflict. The simulation results show that, in the larger nodes density circumstances, the performance of IISA is better than that of HEED.

关键词： Time division multiple access

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A fast two-plus-one phase-shifting algorithm for high-speed three-dimensional shape measurement system

A fast two-plus-one phase-shifting algorithm for high-speed ...

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4th International Symposium on Precision Mechanical Measurements

作者： Wang, Wenyun Guo, Yingfu School of Electromechanical Engineering Hunan University of Science and Technology Xiangtan 411201 China

Phase-shifting methods for 3-D shape measurement have long been employed in optical metrology for their speed and accuracy. For real-time, accurate, 3-D shape measurement, a four-step phase-shifting algorithm which has the advantage of its symmetry is a good choice;however, its measurement error is sensitive to any fringe image errors caused by various sources such as motion blur. To alleviate this problem, a fast two-plus-one phase-shifting algorithm is proposed in this paper. This kind of technology will benefit many applications such as medical imaging, gaming, animation, computer vision, computer graphics, etc. © 2008 SPIE.

关键词： computer graphics

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On evaluation criterion of image super-resolution reconstruction

On evaluation criterion of image super-resolution reconstruc...

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2nd International Conference on Innovative Computing, Information and Control, ICICIC 2007

作者： Zhang, Jian Huang, Cailun Fan, Xiaoping Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment Hunan University of Science and Technology Xiangtan China College of Information Science and Engineering Central South University Changsha China

ISBN: (纸本)0769528821

The image super-resolution and its reconstruction techniques are introduced, the super-resolution evaluation criterion is preliminarily discussed, the minimizing norm of image difference gradient modular square sum, frequency domain method and profile density curve method are proposed and simulation tests and analysis are carried out in this paper. It is shown from the tests that these methods are superior to the traditional methods of objective evaluation and can be better in accordance with the subjective evaluation results. © 2007 IEEE.

关键词： Image reconstruction

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Image segmentation based on rough set theory and neural networks

Image segmentation based on rough set theory and neural netw...

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5th International Conference on Visual Information engineering, VIE 2008

作者： Jiang, Jiafu Yang, Dingqiang He, Wei College of Computer and Communication Engineering Changsha University of Science and Technology Changsha Hunan 410076 China

ISBN: (纸本)9780863419140

A new method for image segmentation based on rough set theory and neural networks is proposed. First, the rough set is used to reduce the image attributes, extract rules, draw out the key components of image as the input of the neural networks;then, it ascertains the number of neurons in the hidden layers according to the rules and revises the weight of the neural networks by the attribute essentiality of rough set theory. Experimental results show that the method has a greater ability on resisting noise. At the same time, it solves the problem that happens in image segmentation by only using neural networks, such as "blind spots" of the neurons, the complicated structure of the networks, slower speed of constringency and so on. It greatly shortens the training time of the networks while improving the result of segmentation. ©2008 The Institution of engineering and technology.

关键词： Rough set theory

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Software watermarking based on dynamic program slicing

Software watermarking based on dynamic program slicing

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4th International Conference on Intelligent Information Hiding and Multimedia Signal Processing

作者： Deng, Xiaohong Xu, Guowen Sun, Guang Man, Junfeng College of Applied Science Jiangxi University of Science and Technology Jiangxi China Department of Information Management Hunan College of Finance and Economic Hunan China School of Computer and Communication Hunan University Hunan China

ISBN: (纸本)9780769532783

Now, watermarking technology has been widely applied for software's content security. To against limitations in resisting reverse engineering attack to watermarks embedded in software, a novel software watermarking approach based on dynamic program slicing is presented. Firstly, the system is splitted into open and hidden modules using the technology of dynamic program slicing, and then the watermark information is embedded by changing the data dependency between the interactive modules. The watermark is recognized through recording this dependent relation in execution history. The complexity experiment of recovering the hidden module proves that the arithmetic is robust to reverse engineering attack;and the evaluation of interactive time-cost between the open and hidden module shows that its effect to program's running efficiency is reasonably low.

关键词： software watermarking content security dynamic program slicing reverse engineering

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Research on a novel multicast routing hybrid optimization algorithm and its application

Research on a novel multicast routing hybrid optimization al...

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5th International Conference on Embedded and Ubiquitous Computing, EUC 2008

作者： Shi, Dejia Jiang, Weijin Xu, Danping School of Computer and Electronic Engineering Hunan University of Commerce Changsha China School of Computer Wuhan University of Technology Wuhan China College of Information Engineering Xiangtan University Xiangtan China

ISBN: (纸本)9780769534923

The problem of multicast routing with multiple QoS constraints is NP complete problem. Most of the multimedia applications require strict QoS guarantee during the communication between a single source and multiple destinations. This gives rise to the need for an efficient QoS multicast routing strategy. Determination of such QoS-based optimal multicast routes basically leads to a multi-objective optimization problem, which is computationally intractable in polynomial time due to the uncertainty of resources in high-performance networks. This paper describes a network model for researching the routing problem and we propose a new multicast tree selection algorithm based on genetic algorithms to simultaneously optimize multiple QoS parameters. Based on QoS constrains such as delay, delay jitter, bandwidth and packet loss metrics this paper describes a network model suitable for investigating the routing problem and presents a multicast routing algorithm with multiple QoS constraints based on GA and TS hybrid strategy. This algorithm takes advantage of GA and TS and overcomes the shortcomings of GA used in solving the multicast routing problem with multiple QoS constraints -poor climbing ability and immature convergence. The simulation results show that the proposed algorithm is able to find a better solution, fast convergence speed and high reliability. It can meet the real-time requirement in multimedia communication networks. The scalability and the performance of the algorithm with increasing number of network nodes are also quite encouraging. © 2008 IEEE.

关键词： Genetic algorithms

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Multi-Objective Evolutionary Algorithm for Mining 3D Clusters in Gene-sample-time Microarray Data

Multi-Objective Evolutionary Algorithm for Mining 3D Cluster...

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IEEE International Conference on Granular Computing

作者： Liu, Junwan Li, Zhoujun Hu, Xiaohua Chen, Yiming National University of Deference Technology School of Computer Science Central South University of Forestry and Technology National University of Deference Technology School of Computer Science and Engineering Beihang University College of Information Science and Technology Drexel University National University of Deference Technology School of Information Science and Technology Hunan Agricultural University

ISBN: (纸本)9781424425129

Latest microarroy technique can measure the expression levels of a set of genes under a set of samples during a series of time points, and generates new datasets which are called gene-sample-lime (simply GST) microarray data. Mining three-dimensional (3D) clusters from GST datasets is important in bioinformatics research and biomedical applications. Several objectives in conflict with each other have to be optimized simultaneously during mining 3D clusters, so multi-objective modeling is suitable for solving 3D clustering. This paper proposes a novel multi-objective evolutionary 3D clustering algorithm to mine 3D cluster in 3D microarray data. Experimental results on real dataset show that our approach can find significant 3D clusters of high quality.

关键词： Evolutionary algorithms

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Application of synthetic principal component analysis model to mine area farmland heavy metal pollution assessment

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Journal of Coal science & engineering(China) 2008年第1期14卷 109-113页

作者：王从陆吴超王卫军 College of Energy and Safety Engineering Hunan University of Science and TechnologyXiangtan 411201China School of Resources and Safety Engineering Central South UniversityChangsha 410083China

Referring to GB5618-1995 about heavy metal pollution,and using statistical analysis SPSS,the major pollutants of mine area farmland heavy metal pollution were identified by variable clustering *** and classification were done to the mine area farmland heavy metal pollution situation by synthetic principal components analysis (PCA).The results show that variable clustering analysis is efficient to identify the principal components of mine area farmland heavy metal *** and clustering were done to the synthetic principal components scores of soil sample,which is given by synthetic principal components *** structure of soil heavy metal contaminations relationships and pollution level of different soil samples are *** results of mine area farmland heavy metal pollution quality assessed and classified with synthetic component scores reflect the influence of both the major and compound heavy metal pol- *** and assessment results of mine area farmland heavy metal pollution can provide reference and guide to propose control measures of mine area farmland heavy metal pollution and focus on the key treatment region.

关键词： synthetic principal components analysis model heavy metal pollution mineregional soils

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Iron removal from oilfield produced water by chemical precipitation and filtration

Iron removal from oilfield produced water by chemical precip...

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2nd International Conference on Bioinformatics and Biomedical engineering, iCBBE 2008

作者： Li, Fangwen Wu, Jianfeng Xu, Xiaohong Wu, Xiaoai Ma, Songjiang School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 411201 China School of Materials Science and Technology Wuhan University of Technology Wuhan 430074 China

ISBN: (纸本)9781424417483

Effect of pH in the oil field produced water on iron removal and effluent turbidity was explored by chemical precipitation and a filtration process using sodium hydroxide and porous ceramic filtration media. Mechanisms of iron removal and inhibition of electrochemical corrosion on the treatment device were discussed. The present investigation showed that influent pH had a remarkable influence on iron removal, effluent turbidity and anti- corrosion of treatment devices. Iron removal effectiveness was poor, and corrosion of the treatment device could not be inhibited at pH

关键词： Electrochemical corrosion

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