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Reliability analysis on bolt support structure of coal roadway under the influence of mining

engineering sciences 2008年第3期6卷 64-68,84页

作者： Zhang Daobing Luo Yixin Zhu Chuanqu School of Energy ＆ Safety Engineering Hunan University of Science and Technology Xiangtan Hunan 411201 China Hunan Key Laboratory of Safe Mining Techniques of Coal Mines Xiangtan Hunan 411201 China Hunan Financial ＆ Economic College Changsha 410205 China

Based on the features of the serious deformation of coal roadway,many random variables of the mechanics of the surrounding rocks and the influence of mining, the reliability analysis model of the support structure of coal roadway under the influence of mining is established,and the calculating formulas of reliability of the support structure is obtained with the engineering structure reliability theory. And the reliability is calculated based on the method of Monte Carlo to the coal roadway which is exampled on the influence of mining or not. The relationship between support parameters and reliability, the mining influence coefficients and reliability is established, which provides theory foundations for the design of the coal roadway bolt support.

关键词： coal roadway influence of mining bolt support structure reliability the method of Monte Carlo

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Supercontinuum generation in photonic crystal fibers with different dispersion profiles

Supercontinuum generation in photonic crystal fibers with di...

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Optical Transmission, Switching, and Subsystems VI

作者： Cai, Wangyang Zhang, Hua Lei, Dajun Wen, Shuangchun College of Computer and Communicational Engineering Changsha University of Science and Technology Changsha 410076 China Key Laboratory for Micro/Nano Opto-Electronic Devices Hunan University Ministry of Education Changsha 410082 China

ISBN: (纸本)9780819473769

It has been investigated of nonlinear propagation of femosecond pulse and supercontinuum generation (SCG) in three photonic crystal fibers (PCFs) with different dispersion profile in the 1550nm window by numerical stimulation. The influence of higher-order effects on supercontinuum, including higher-order dispersion (HOD), self-steepening (SS), and stimulated Raman scattering (SRS), are discussed in detail as well. The results of numerical simulations show that group velocity dispersion and self-phase modulation take main effect in the initial stage. In the PCF with anomalous dispersion, SRS plays main role when the propagation distance increases, which induces a red-shift of the central wavelength, suggesting the appearance of soliton self-frequency shift. In the PCF with near-zero anomalous dispersion, HOD plays main role. This results in the fission of higher-order solitons and remarkable broadening of the pulse spectrum. In the PCF with normal dispersion, higher-order effects have almost no effect on the pulse. The Gaussian pulse wave broadens to rectangular symmetrically, and the pulse spectrum broadens symmetrically, too. However, the broadening is smaller than the former two cases. © 2008 SPIE.

关键词： Photonic crystal fibers

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Further research on web service-oriented asynchronous invoking

Further research on web service-oriented asynchronous invoki...

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International Conference on Communication Systems and Electrical engineering

作者： Liu, Changsheng Li, Changyun Tang, Jingtian Cheng, Ying Central South University School of Info-physics and Geomatics Engineering Hunan ChangSha 410083 China ChangSha Aeronautical Vocational and Technical College Hunan ChangSha 410014 China Department of Computer Science and Technology Zhuzhou Institute of Technology Zhuzhou 412008 China

ISBN: (纸本)9780387749372

We have put forward the concept of "invoking in infrastructure" (III) and have designed a corresponding method to reduce the dependency relationship during invoking. Through the invoking-back mechanism, with the service asynchronous operation mechanism included in the design of the component running platform, III can support service asynchronous invoking and session stating. We have also designed an infrastructure as the running environment with the above method, which can be implemented on the existent component running platform. Further work will involve studying the procedure-oriented model of software architecture, and to use this model as the guiding rule to carry out the development of Web services, the flexible linking, and the theory and dynamical integration of distributed service. © Springer 2008.

关键词： Web services

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An Adaptive Quantitative Information Hiding Algorithm Based on DCT Domain of New Visual Model

An Adaptive Quantitative Information Hiding Algorithm Based ...

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International Symposium on Information science and engineering, ISISE

作者： Gengming Zhu Nong Sang Department of Computer Science and Engineering Hunan University of Science and Technology Xiangtan China Institute for Pattern Recognition and Artificial Intelligence Huazhong University of Science and Technology Wuhan China

On the basis of the analysis of human visual system characteristics, combined with Watson visual model, an improved information hiding algorithm based on image DCT (discrete cosine transform) domain is proposed. By experiments and comparisons, the improved algorithm can enhance the imperceptibility of hidden information. In order to improve the anti-JPEG compression property of stego image, according to image compression coding principle, an algorithm which can effectively improve the JPEG compression ratio of stego image is also put forward. The experimental results show that this algorithm has better effect on improving concealment of information hiding and ensuring robustness of hidden information.

关键词： Discrete cosine transforms Signal processing algorithms Humans Quantization Image coding Robustness Discrete Fourier transforms Image analysis Information analysis Transform coding

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A Novel Algorithm for Solving Nonlinear Equations

A Novel Algorithm for Solving Nonlinear Equations

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International Conference on Computational Intelligence and Security

作者： Wenli Xie Zhezhao Zeng Faculty of Materials Optoelectronics and Physics Xiangtan University Xiangtan Hunan China College of Electrical and Information Engineering Changsha University of Science and Technology Changsha Hunan China

ISBN: (纸本)9781424441969

A novel algorithm for solving nonlinear equations is proposed. The computation is carried out by simple gradient descent rule with adaptive variable step-size. In order to make the algorithm be absolutely convergent, its convergence theorem was presented and proved. The convergence theorem indicates the theory criterion selecting the magnitude of the learning rate ¿ . Some specific examples show the application of the method. The results illustrate the proposed method can solve effectively nonlinear equations at a very rapid convergence and very high accuracy. Furthermore, it has also the added advantage of being able to compute exactly nonlinear equations.

关键词： Nonlinear equations Iterative methods Newton method Iterative algorithms Convergence Adaptive algorithm Computational intelligence Security Physics Educational institutions

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Controllable preparation of monodisperse polystyrene microspheres with different sizes by dispersion polymerization

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Macromolecular Symposia 2008年第1期261卷 113-120页

作者： Liu, Qingquan Wang, Li Xiao, Anguo Yu, Haojie Tan, Qiaohua Ding, Jianhua Yu, Conglin State Key Laboratory of Chemical Engineering College of Materials Science and Chemical Engineering Zhojiang University Hangzhou 310027 China College of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 410027 China

Monodisperse polystyrene (PS) microspheres with different sizes were prepared by dispersion polymerization in dispersion media of ethanol/water and isopropayl alcohol/water, respectively. The effect of polarity of the dispersion medium, stabilizer and initiator concentration on the average sizes and size range were evaluated. The results show that monodisperse PS microspheres with different sizes could be prepared in dispersion media of ethanol and isopropyl alcohol/water when appropriate initiator and stabilizer concentrations were employed, and the latter is a more appropriate medium to prepare uniform PS microspheres. It was found that the microsphere sizes reduced with increasing water content in the dispersion medium. Furthermore, in isopropyl alcohol/water dispersions, the average sizes decreased with increasing stabilizer concentration. Copyright © 2008 WILEY-VCH Verlag GmbH & Co. KGaA.

关键词： Dispersions

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Real-time red tide algae classification using naive Bayes classifier and SVM

Real-time red tide algae classification using naive Bayes cl...

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

作者： Jiang, Tao Wang, Cheng Wang, Boliang Xie, Jiezhen Jiao, Nianzhi Luo, Tingwei College of Electronic Science and Engineering NUDT Changsha Hunan 410073 China Department of Computer Science and Technology Xiamen University Xiamen Fujian 361005 China State Key Laboratory of Marine Environmental Sciences Xiamen University Xiamen Fujian 361005 China

ISBN: (纸本)9781424417483

This paper presents a real-time alga classifier designed for flow-cytometry-based marine alga monitoring systems. The difficulties of such classification includes: (1) the shape of the same algae category is deformable, and largely variant due to the individual differences and mature stage;(2) the image of algae may vary due to different 3D positions to the imaging plane and partial occlusion;(3) the images also contain unknown algae and contaminations. In the proposed method, several shape features were developed, a naive Bayes classifier was trained to reject the contaminative objects and unknown algae and a support vector machine (SVM) was used to classify the algae to taxonomic categories. Our approach achieved greater 90% accuracy on a collection of algal images. The test on contaminated algal image set (contains unknown algae and non-algae objects, such as sands) also demonstrated promising results. © 2008 IEEE.

关键词： Algae

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Approach to resolving two paradoxes in probability theory

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Journal of Shanghai Jiaotong university (science) 2008年第3期13 E卷 362-365页

作者： Liu, Dao-Jian Huang, Tian-Min Chen, Ya-Bo School of Mathematics and Computing Science Hunan University of Science and Technology Xiangtan 411201 China School of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China Science College Hunan Agricultural University Changsha 410128 China

A new mathematical expectation formula with some hypotheses, notions and propositions was given to get rid of the challenge of St. Petersburg paradox and Pascal's wager. Relevant results show that it is very effective to apply the model to solve the expected revenue problems containing random events with low probability but high revenue. This work also provides the probability theory with a more widely applied perspective in group decision-making.

关键词： Decision making

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New method of image restoration based on least squares

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Journal of Information and Computational science 2008年第2期5卷 837-844页

作者： Zhang, Jian Fan, Xiaoping Huang, Cailun Yu, Guohua College of Information Science and Engineering Central South University Changsha 410083 China Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment Hunan University of Science and Technology Xiangtan 411201 China

The image restoration is to recover the descending quality images to the original images, is a very important research field in the image processing. A general approach to the image restoration problem is presented on the basis of the method of least squares. Inverse filtering, minimum mean-square-error restoration, constrained least squares restoration, and the maximum a posteriori restoration with normally distributed errors of the pixel measurements are special cases of it. Some restoration methods based on the space domain and frequency domain have been brought forward since researchers have carried on a great deal of studies on the image restoration for many years. In order to reduce the complexity of calculation while processing large decreased image, an image restoration algorithm based on least squares has been developed. When putting it into implementation, a new method named ally-template has been proposed, which parrys transform of frequency domain. Its algorithm architecture is easily implemented. The experimental results demonstrate this approach is effective.

关键词： Image reconstruction

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Sensitivity analysis of glacier systems to climate warming in China

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Journal of Geographical sciences 2008年第2期18卷 190-200页

作者： WANG Xin XIE Zichu LI Qiaoyuan WANG Shuhong CHENG Lei State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research Institute CAS Lanzhou 730000 China Research Institute of Geo-spatial Information Science Hunan University of Science ＆ Technology Xiangtan 411201 China College of Resources and Environment Hunan Normal University Changsha 410081 China

Data of 44 glacier systems in China used in this paper were obtained from Chinese Glacier Inventories and the meteorological data were got from Meteorological Atlas of Plateau of west China. Based on the statistical analysis and functional model simulation results of the 44 glacier systems in China, the glacier systems were divided into extremely-sensitive glacier system, semi-sensitive glacier system, extremely-steady glacier system and semi-steady glacier system in terms of glacier system＇s level of water-energy exchange, rising gradient of the equilibrium line altitudes and retreating rate of area to climate warming, their median size and vertical span distribution, and their runoff characteristics to climate warming. Furthermore the functional model of glacier system to climate warming was applied in this paper to predict the average variation trends of the 4 types of glacier systems, which indicate that different sensitivity types of glacier systems respond to the climate warming differently.

关键词： glacier system functional model response to climate warming type of sensitivity

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