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Table of Content

      
    20 March 2015
    Volume 50 Issue 03
    Modeling and evaluation of a dual chaotic encryption algorithm for WSN
    ZHANG Jing, XUE Leng, CUI Yi, RONG Hui, WANG Jian-ping
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  1-5.  doi:10.6040/j.issn.1671-9352.3.2014.147
    Abstract ( 574 )   PDF (2289KB) ( 756 )   Save
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    WSN (wireless sensor networks) is a typical application of Ad-Hoc networks in the internet of things (IoT). The security of WSN influences the existence and uniqueness of real-time interactions in IoT services, and relates to the security metrics of the industrial real-time embedded control systems. According to the characteristics of WSN, a dual chaotic encryption algorithm that is a combination of Logistic map and Henon map (EDC) was designed. And it realized the dual encryption of the plaintext and effectively guaranteed the safety of the data. Finally, the experiment results show that the new algorithm is highly efficient and secure which is very suitable for WSN and can be used to design the security model and evaluate the performance of the industrial real-time embedded control systems.
    Weibo new word recognition combining frequency characteristic and accessor variety
    ZHOU Chao, YAN Xin, YU Zheng-tao, HONG Xu-dong, XIAN Yan-tuan
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  6-10.  doi:10.6040/j.issn.1671-9352.3.2014.284
    Abstract ( 581 )   PDF (985KB) ( 645 )   Save
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    Along with the rapid development of Weibo, a lot of new words have appeared. These words have characteristic that spread fast and flexible combination with other words. They are easy to be cut apart into different string in segmentation processing. Therefore a new word recognition method that combines word frequency characteristics and accessor variety was proposed. The first step was to segment the large scale Weibo sentences into words, and then combine the two adjacent strings between stop words. The new word candidate strings could be obtained according to the string frequency of the combination. After the filtration through the word formation rules, the candidate new words would be found. Finally, through the characteristics of the word accessor variety, the garbage string was removed to get the new words. Experiments of new word recognition on COAE 2014 task 3 show that the accuracy can reach 36.5% and this method has a good performance.
    Scientific literature information extraction based on semantic pattern and reference distribution
    YANG Zhong-guo, LI Hong-qi, ZHU Li-ping, LIU Qiang
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  11-19.  doi:10.6040/j.issn.1671-9352.3.2014.122
    Abstract ( 454 )   PDF (2185KB) ( 762 )   Save
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    In the scientific and technology literature, the review of previous research results, analysis of existing problems, propose solutions and other language fragment are part of the innovation of this information. The logical thinking pattern of problem analysis information in the paper and the discourse relation were analyzed. A utilization of reference distribution, discourse relation characteristics, negative emotional characteristics was made to construct universal semantic pattern of information extraction. The problem analysis information was extracted from the original text by matching the defined semantic pattern. At the same time, the guide words feature and semantic similarity were used to extract the mainly work information from papers. Focusing on the science and technology literature of the data mining field, the proposed method was evaluated by contrasting with the artificial extraction results. The results show that this method can accurately extract the corresponding information, provide the basic data source for clustering of scientific papers and the paper recommends.
    Entity set expansion based on LDA and label propagation
    MA Yu-feng, RUAN Tong
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  20-27.  doi:10.6040/j.issn.1671-9352.3.2014.101
    Abstract ( 568 )   PDF (1999KB) ( 1273 )   Save
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    Set expansion refers to expanding a partial set of "seed" objects into a more complete set. A widely employed approach to set expansion is based on iterative bootstrapping, which can be applied with only small amounts of supervision and which scales bad to very large corpus. A well-known problem with iterative bootstrapping is a phenomenon known as semantic drift: as bootstrapping proceeds it is likely that unreliable patterns will lead to false extractions. To address this issue, a hybrid method for entity set expansion was proposed based on LDA and label propagation. The whole entities in an entity list were considered to prevent words ambiguity; and the LDA used model to mine semantic information in contexts between entity lists to resolve the semantic drift phenomenon. Experiments were conducted with some datasets, and the evaluation demonstrates the effectiveness, efficiency, and scalability of the proposed solution.
    Consumer repurchases intention mining analysis based on online review
    CUI Xue-lian, HONG Yue, ZHAO Narisa
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  28-31.  doi:10.6040/j.issn.1671-9352.3.2014.186
    Abstract ( 500 )   PDF (2163KB) ( 459 )   Save
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    According to the online consumer repurchase behavior model and the theory of planned behavior, the consumer repurchase behavior intention model was built from both the consumer emotions and website external promotion factor. And through the online review extraction and semantic analysis of the emotional words the consumer satisfaction and trust were computed. Then the repurchases intention of consumers was also gotten based on the fuzzy inference theory. Finally, according to the repurchase intention of consumers for different products and the number of online product collections, the products were classified and effective marketing advices for businesses was given.
    An accurate and fast pose estimation algorithm foron-board camera of mobile robot
    TANG Qing-shun, WU Chun-fu, LI Guo-dong, WANG Xiao-long, ZHOU Feng-yu
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  32-39.  doi:10.6040/j.issn.1671-9352.0.2014.444
    Abstract ( 564 )   PDF (2293KB) ( 1073 )   Save
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    An accurate and fast pose estimation problem for on-board camera of mobile robot is investigated. Firstly the special properties of the pose for on-board camera of mobile robot are analyzed. Secondly, an auxiliary rotation matrix is constructed using the on-board camera's equivalent rotation axis, which is utilized to turn the initial essential matrix and homography matrix into a simplified kind that can be decomposed through elementary mathematical operations. Finally, some simulation experiments are designed to verify the algorithm's rapidity, accuracy and robustness. The experimental results show that compared to traditional algorithms, the proposed algorithm can acquire higher accuracy and faster calculating speed, together with the robustness to the disturbance of the on-board camera's equivalent rotation axis. In addition, the number of possible solutions are reduced one half, and the unique rotation angle of the mobile robot can be determined except for the condition that the 3D planar scene structure and the ground are perpendicular, which can provide great convenience for controlling the pose of the mobile robot.
    Effect of friction on the critical jammed states of two-dimensional granular systems
    ZHANG Xing-gang, HU Lin
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  40-44.  doi:10.6040/j.issn.1671-9352.0.2014.305
    Abstract ( 477 )   PDF (1173KB) ( 381 )   Save
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    The DEM simulation was conducted to investigate the jamming transition of bidisperse disk assemblies under isotropic compression, and the effect of friction on the critical jammed states was mainly discussed. As the friction coefficient increases, the packing fraction and the average contact number decrease; the difference between mechanical and geometrical average contact number increases; and the percentage of particles which have different contact numbers also varies with friction. According to the numerical results, the critical jammed states got from zero and infinite friction coefficient are isostatical packing, and the packing fraction shows a linear correlation with mechanical average contact number at J point.
    Fleet-assignment model and algorithm based on stochastic chance-constrained
    GUAN Jing, ZHANG Xiao-bin, ZHANG Jin-feng
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  45-51.  doi:10.6040/j.issn.1671-9352.0.2014.018
    Abstract ( 576 )   PDF (1066KB) ( 413 )   Save
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    In order to meet the growing demand of passenger and protect the safety of civiation operation, the fleet assignment of airline should not only meet the requirements for aircraft periodic maintenance, but also provide suitable fleet to meet passenger demand. So random variables was introduced to construct a stochastic chance-constrained model, thus propose algorithm meet the requirements of the maintenance cycle. In the case studies, stochastic simulation with hybrid intelligent algorithm was applied to solve this problem. The results show that the stochastic chance-constrained model is more practical than the basic model and provides the optimization method with balance between efficiency and safety.
    Classical solutions to stationary one-dimensional quantum energy-transport model
    DONG Jian-wei, CHENG Shao-hua, WANG Yan-ping
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  52-56.  doi:10.6040/j.issn.1671-9352.0.2014.253
    Abstract ( 431 )   PDF (738KB) ( 272 )   Save
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    A stationary quantum energy-transport model for semiconductors was studied in a one-dimensional bounded domain. The existence of classical solutions was proved in the case that the heat conductivity depends on the electron density and the electron temperature. Moreover, the uniqueness of the solutions was shown when the lattice temperature was large enough and the current density was relatively small. The proof was based on using an exponential variable transformation, the Leray-Schauder fixed-point theorem and some inequality techniques.
    (Strong) oscillation analysis of quasilinear hyperbolic systems with impulse effect
    LUO Li-ping, LUO Zhen-guo, ZENG Yun-hui
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  57-61.  doi:10.6040/j.issn.1671-9352.0.2014.083
    Abstract ( 485 )   PDF (1389KB) ( 293 )   Save
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    The (strong) oscillation properties of a class of quasilinear hyperbolic systems with impulse effect are investigated. By using a new technique of treating quasilinear diffusion term and some results of impulsive differential inequality, some sufficient criteria are obtained for the (strong) oscillation of all solutions of such systems under second boundary condition. The results fully indicate that the system oscillation are caused by impulse effect.
    The Ambrosetti-Prodi type results of the nonlinear second-order Neumann boundary value problem
    MA Lu-yi
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  62-66.  doi:10.6040/j.issn.1671-9352.0.2014.326
    Abstract ( 344 )   PDF (738KB) ( 284 )   Save
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    We study the relationship between s and the number of solutions of the second-order Neumann boundary value problem 

    where fC([0,1]×R2,R), sR is a parameter. By using the method of the upper and lower solutions and topological degree techniques, we obtain that the problem has no solution, at least one solution and at least two solutions, when s<s1, s=s1, s>s1, respectively.
    A nonlinear mixed boundary value problem for singularly perturbed forth-order differential equation
    CHEN Wen, YAO Jing-sun, YANG Xue-jie
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  67-72.  doi:10.6040/j.issn.1671-9352.0.2014.090
    Abstract ( 468 )   PDF (743KB) ( 273 )   Save
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    A singularly perturbed boundary value problem for forth-order nonlinear differential equation with nonlinear mixed boundary condition is studied. The formal asymptotic solution is constructed by using the composite expansion method. According to the theory of differential inequalities, the existence of solution for the problem is proved and the error estimate of asymptotic solution is given.
    Existence of positive solutions of the boundary value problem for a class of fractional differential equations with delay
    ZHENG Chun-hua, LIU Wen-bin
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  73-79.  doi:10.6040/j.issn.1671-9352.0.2014.140
    Abstract ( 424 )   PDF (759KB) ( 282 )   Save
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    A class of fractional differential equation with two-point boundary value problem and delay is studied. By using a fixed point theorem on cones and some analysis technique, some sufficient conditions on the existence of solutions for this boundary value problem are obtained,Some known results are extended and improved.
    Dynamics research in a predator-prey system with a nonlinear growth rate
    YANG Wen-bin, LI Yan-ling
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  80-87.  doi:10.6040/j.issn.1671-9352.0.2014.339
    Abstract ( 468 )   PDF (4179KB) ( 361 )   Save
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    The paper is concerned with a predator-prey diffusive dynamics subject to homogeneous Dirichlet boundary conditions, where the predator population reproduces by the nonlinear function 1/(1+ev). Existence and uniqueness of coexistence states for the predator-prey system are investigated. Moreover, some asymptotic behaviors of time-dependent solutions are shown and some numerical simulations are done to complement the analytical results. The main tools used here include the implicit function theorem, the bifurcation theory and the perturbation technique.
    On a generalization of strongly α-revesible rings
    WEI Jie, DONG Jun
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(03):  88-94.  doi:10.6040/j.issn.1671-9352.0.2014.333
    Abstract ( 414 )   PDF (767KB) ( 742 )   Save
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    The notions of strongly (M-)α-reflexive rings are introduced which are a general version of strongly α-revesible rings, and investigate their properties. It is show that strongly α-revesible rings are strongly α-reflexive rings, but the converse is not true. And argue about the strongly (M-)α-reflexivity of some kinds of extensions. A number of properties of these versions are established.