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Table of Content

      
    20 December 2013
    Volume 43 Issue 6
    Articles
    A panorama stitching algorithm based on forward motion video of trains
    GAO Da-long, HUANG Ya-ping*, LI Qing-yong, WANG Sheng-chun, LUO Si-wei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  1-6. 
    Abstract ( 495 )   PDF (2059KB) ( 1747 )   Save
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    A panoramic representation framework for high-speed railway was designed based on the forward moving video, and then a fast method to create panorama was proposed based on forward moving video. The created panoramas in 3D space were reconstructed to imitate the real environment of train running. The experimental results showed that this method had many advantages in data storage and scene browsing, which had the potential to be used in many aspects, such as inspecting railway environment and virtual driving of the train.

    A method of sentiment classification for Chinese comments based on naive Bayesian
    LU Ling1, WANG Yue2, YANG Wu1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  7-11. 
    Abstract ( 611 )   PDF (1027KB) ( 1542 )   Save
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    A method of sentiment classification for Chinese  comments based on naive Bayesian was presented. The sentiment phrases were used as document features in the approach. The task was decomposed into three phases: the identifying sentiment phrases by sentiment dictionary and negative adverbs, the extracting features according to threshold of CHI, and the constructing sentiment classifier based on naive Bayesian. Some experiments were conducted under distinct environments, including different threshold of CHI, different feature selection, such as sentiment words or sentiment phrases, and different area of training corpuses. The experimental results showed that the classifier based on naive Bayesian working could obtain high performance.

    Automatic image annotation based on approved FCM algorithm and Bayesian classification
    ZHU Na-na1, 2, ZHANG Hua-xiang1, 2*, LIU Li1, 2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  12-16. 
    Abstract ( 452 )   PDF (1937KB) ( 863 )   Save
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    In order to cross the semantic gap between high-level semantic concepts and low-level visual features,  a new method about automatic image annotation was proposed. First,  the method of gray histogram was applied to segment images and texture features were  extracted from image regions. Second,  the greater weights could be  distributed to relevant features compared with less relevant features for FCM algorithm,  and better results of clustering could be achieved. Finally,  the correlation model between keywords and clustering regions was  established in accordance with the labeled images in the training sets by the approved Bayesian classification. The similarity between the testing images and the training images were calculated,  and the maximal conditional probability to annotate the new image regions was achieved. The experiments on a standard Corel dataset compared with other methods showed that the approved labeling approach performed more accurately and effectively than traditional labeling methods.

    Adaptive active contour model for weak boundary extractio
    QI Shile, WANG Meiqing
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  17-20. 
    Abstract ( 467 )   PDF (1661KB) ( 1176 )   Save
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    An adaptive active contour model for weak boundary extraction was proposed to improve LI′s distance preserving level set method. Besides, the adaptive force was proved to be bidirectional. The mean gray value of the image was added in the coefficient of the proposed model, so that the adaptive force could shrink or expand adaptively according to the position of the evolution curve. The experimental results showed that the proposed method could overcome the problem of LI′s model, which was that the initial contour must be fully enclosed by or contained within the target object. It was robust with the position of the initial contour and noise, and could segment multitarget images.

    The application of varying coefficient model in the study of medical longitudinal data
    FANG Li-ying, LI Shuang, WANG Pu, CHEN Pei-yu
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  21-26. 
    Abstract ( 462 )   PDF (1292KB) ( 1029 )   Save
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    In order to study the medical longitudinal data modeling,the varying coefficient was used to explore the relationship between time-varying detection index and tumor size, and two-step iterative procedure based on basis expansion and adaptive-LASSO penalty least square method was proposed. This method could estimate the coefficient and meanwhile separate the variable coefficient, constant coefficient and zero coefficient. This method was applied to study the cancer data, to estimate the cofficient of each variable, to study the effect of symptom to the progression of tumor size in different time, and to predict the tumor size. The average relative error of model showed that the simulation effect was well.

    A method on building Chinese sentiment lexicon for text sentiment analysis
    ZHOU Yong-mei1, YANG Jia-neng2, YANG Ai-min1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  27-33. 
    Abstract ( 1413 )   PDF (1259KB) ( 5265 )   Save
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    A method on building Chinese sentiment lexicon based on HowNet and SentiWordNet was proposed,in which sentiment intensity of the word was automatically calculated by decomposing it into multiple semantic units and a lexicon proofreading technique was used to optimize the value of sentiment intensity of the word. The building lexicon was applied to the task of sentiment analysis, in which the support vector machine was used to build the sentiment classifier. The experiment results showed that the built sentiment lexicon was more effective than the general polar sentiment lexicon,and provided an effective dictionary resource for the research of sentiment analysis.

    An adaptive interative learning control of the first-order nonlinear delay  system based on generalized tracking error
    WEI Jian-ming, HU Yun-an, SUN Mei-mei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  34-41. 
    Abstract ( 578 )   PDF (1416KB) ( 841 )   Save
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    An adaptive iterative learning control (AILC) scheme was proposed for a class of first-order nonlinear parameterized systems with unknown time-varying delays. By utilizing boundary layer function to construct generalized tracking error, the assumption of initial condition for iterative learning control (ILC) was removed. The possible singularity problem arising from boundary layer function was avoided by introducing the hyperbolic tangent function. According to the characteristic of hyperbolic tangent function, the boundedness of all signals and the convergence of tracking errors were proved in two cases by constructing Lyapuonv-Krasovskii-Like composite energy function (CEF). Finally a simulation example demonstrates the effectiveness of the control scheme.

    Partially asymptotically stable and finite-time stable observer design for a class of chained systems
    SHEN Yan-jun1, WU Chao-yan2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  42-46. 
    Abstract ( 482 )   PDF (1045KB) ( 880 )   Save
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    Partially asymptotically stable observer and finite-time observer for a class of chained systems were designed. The definition of partially asymptotically stable observer and finite-time observer for the chained systems were presented. Then, the partially asymptotically stable observer and finitetime observer were constructed respectively. By theories of homogeneity and Lyapunov stability, the asymptotical stability and finite-time stability of the observation errors were proved. At last, the validity of the method was demonstrated by a numerical example.

    On comparison and selection of the wave spectrum in realtime rendering of the irregular ocean wave
    CHEN Li-ning, JIN Yi-cheng, REN Hong-xiang, YIN Yong
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  47-52. 
    Abstract ( 805 )   PDF (1289KB) ( 1314 )   Save
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    The Phillips spectrum was widely applied in real-time rendering of the irregular ocean wave. The structure of the Phillips spectrum was analyzed, and the frequency spectrum and directional distribution function of the Phillips spectrum were calculated. The frequency spectrum was similar with the P-M spectrum, so the constant A of the Phillips spectrum was computed by reference to the P-M spectrum, and the spectral wind speed was clarified. In addition to the Phillips spectrum, other spectra were tried. The P-M spectrum and the directional distribution function of the cos(-2s) form were used to construct the PM-cos2s spectrum, and the JONSWAP spectrum and the direction distribution function of the Poisson form were applied for constructing the J-Po spectrum. The three spectra mentioned above were used for rendering ocean wave, and the rendering results were compared. The waves rendered by the Phillips spectrum or PM-cos2s spectrum reflected the wind speed effect, and the wave generated by the J-Po spectrum showed the wind speed effect along with the fetch length effect. The frame rate of the three spectra shared the same value. Because the wave produced by the J-Po spectrum reflected the wind speed and fetch length influence, and the generated wave distributed in (-π,π] of the wind direction, the J-Po spectrum was more suitable for the maritime simulator.

    Intrusion detection technology based on twin support vector machine
    WANG Hao, HUA Ji-xue, FAN Xiao-shi
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  53-56. 
    Abstract ( 506 )   PDF (1045KB) ( 832 )   Save
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    To improve the performance of network intrusion detection system, an intrusion detection method based on twin support vector machine(TWSVM) was proposed. The basic principle of network intrusion detection system was introduced, an intrusion detection classifier was proposed and an intrusion detection model based on TWSVM was put forward. Moreover, the intrusion detection system based on TWSVM  was tested by simulation. The experimental results showed that the intrusion detection method based on TWSVM was applicable to the intrusion detection system, for it could detect the computer network security at a high speed and high precision when there were rare sample data.

    Stability analysis of random fractured rock mass structure based onthe strength reduction method
    JIA Chao, ZHANG Guo-rong
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  57-64. 
    Abstract ( 524 )   PDF (3272KB) ( 1180 )   Save
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    In order to overcome the limitations of the fractured rock mass deterministic analysis methods, the evaluation of joints and fissures safety stability of the gravity dam was put forth by using the finite element strength reduction method. The 2 D and 3 D random joint fracture network model were generated by Monte-Carlo method, which could reduce the real distribution of joints and fissures. For the two cases of gravity dams that only with soft rock strata and with soft rock strata and rock joints, the strength reduction method was used to comparatively analyze the plastic zone and the horizontal displacement. The analysis results showed that the plastic zone of the gravity dam with joints within the foundation was more, the local damage became serious  and the horizontal displacement of dam became relatively large. Research results could provide a reference for the study on safety and stability of underground engineering of fractured rock mass.

    Experimental research on grouting material for reinforcement of alkaline earth and its engineering application
    FENG Xiao1, ZHANG Le-wen1*, LIU Ren-tai1, ZHANG Chong-gao2, SUN Zi-zheng1, ZHANG Wei-jie1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  65-71. 
    Abstract ( 604 )   PDF (1371KB) ( 994 )   Save
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    On the basis of the grouting reinforcement of alkaline earth, the main performance parameters and properties of material under hydrostatic condition were studied in the laboratory. Based on the engineering requirement, the congealing time of material under different formulation were tested, the strength of net paste stone and rock soil body were tested by mechanical property test. Based on the material of reinforcement requirement, the durability and stability under different hydrostatic conditions were tested and compared with other materials. According to the performance parameters of grouting material and the characteristics of muddy fracture zone in Zhangmatun Iron, grouting material application method and effect were discussed systematically. The results showed that the congealing time of material could be adjusted precisely, the strength of net paste stone and rock soil body were higher, and the durability and stability were better.

    Effect of train-induced vibration on the sensitive structure in city
    KUANG Jian1, WANG Ming-bin2,3, ZHANG Bo4, ZHANG Dun-fu4*
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  72-76. 
    Abstract ( 504 )   PDF (1579KB) ( 1068 )   Save
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    For the monolithic track bed and rubber floating slab track bed, the vehicle-track coupling model was established, and the train loads were calculated by Newmark method. Then the tracksoil coupling model was established, the propagation characteristics on surface of metro vehicle-induced vibration was analyzed, and the effect of metro vehicle-induced vibration on the sensitive structure was studied by the finite element method. The results showed that the vertical Z vibration level of sensitive point and the horizontal vibration velocity of sensitive structure were bigger than the standard values respectively under monolithic track bed, which were lower than the standard values respectively under rubber floating slab track bed. The results also showed that the damping effect of the rubber floating slab track bed was very good.

    Non-destructive detection research of the box girder vertical prestressed tensile force
    ZHOU Xin-bo1, XU Xiang-feng2*, ZHANG Feng3, SUN Jia-long3, QI Guang-zhi3
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  77-82. 
    Abstract ( 595 )   PDF (2786KB) ( 940 )   Save
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    In order to effetively detect the tension of vertical prestressing bars to improve the construction quality and to solve the engineering problem of the cracking at box girder webs caused by vertical excessive prestress loss, the exposed section of fine rolled twisted bar was assumed as a cantilever beam based on the dynamic theory, and the anchoring section of vertical prestressed steel was simulated by one rigid arm and two elastic supports. Then, the plane elastic supporting model was established. The nonlinear model between tension P of fine rolled twisted bar and elastic support stiffness K was put forth based on the experiment data of this model. The proposed method was verified by model test and a method based on flexural rigidity of the exposed segment in the anchorage zone, and this method was applied in the actual bridge engineering. The nondestructive detection method of vertical prestressing was used at the construction period of box girders, the qualified rate of vertical prestress increased from 58.0% to 96.8%, and the construction quality of vertical prestressing was effectively improved. Based on this research, the engineering measures were proposed to improve the anchor plate mounting precision.

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    ZHOU Luan-ai1, TANG Wen-zuo2, CUI Xiao-hua3, SUI Hui-bin4*
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  83-88. 
    Abstract ( 538 )   PDF (1685KB) ( 1049 )   Save
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    With some considered data, such as preventive experiments result, working surroundings, operation records, maintenance records, and so on, by using the method of analytic hierarchy process, an improved fuzzy synthetic evaluation assessment model for cables was proposed, the relative interiority indicator was adopted, and different methods were used to determine the membership functions for qualitative indices and the quantitative indices. Through assessing the layer and sub-layer factors, the comprehensive operating condition of cables can be achieved. Based on the actual monitor data for a 220kV cable in power tunnel, analysis result shows the proposed assessment model was correct and effective.

    Experimental of the effects of static magnetic field on carp frozen process
    LOU Yao-jia, ZHAO Hong-xia*, LI Wen-bo, HAN Ji-tian
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(6):  89-95. 
    Abstract ( 632 )   PDF (1263KB) ( 1490 )   Save
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    Carp frozen process in static magnetic field was experimentally investigated. The test samples were between 600~800g and the maximum thicknesses were between 46~52mm. All frozen processes were performed in an airblast quickfreezer, where the temperature was set -35℃. Magnetic field intensity was respectively 0G/3.6G/7.2G/10.8G. The surface and thermal centre temperatures were measured and recorded continuously in the whole frozen processes. The results indicated that the rule magnetic influencing frozen rate varied at different frozen stages. Magnetic field had little influence on cooling period, while, it held obvious promotion at phase change stage and delayed the freezing period.