Table of Content

  

20 August 2016
Volume 46 Issue 4

Color image encryption algorithm based on complex chaos and affine transform

LIU Zhijun

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  1-8.  doi:10.6040/j.issn.1672-3961.0.2015.367

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According to the characteristics of the color image,the color image airspace encryption algorithm was proposed based on quaternary compound chaotic system structured by the tent map and the Logistic, Cubic, Chebychev map rewrited, the three dimensional affine transformation, diffusion of disturbance key parameters and RGB components joint scrambling.The algorithm that correlation of RGB was very small, key space was huge large, bright ciphertext mapping relationship was complex, could resist exhaustion, plaintext, difference and statistical analysis attacks. The simulation experiment of the classic watermark, figures, landscape types of color images were achieved by matlab7.0. The experimental results(encryption, histogram analysis, the correlation between adjacent pixels, key and the ciphertext sensitivity, information entropy, peak signal-to-noise ratio and similarity)showed that the algorithm has good encryption effect and high safety features.

An improved cycle basis algorithm for haplotyping a diploid individual

WU Huimin, WU Jingli

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  9-14.  doi:10.6040/j.issn.1672-3961.1.2016.229

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HapCompass is an effective heuristic algorithm for solving the minimum weighted edge removal(MWER)model. The HapCompass algorithm eliminated conflicting cycle basis by deleting the edge with the minimum absolute value of weight. When there were several edges whose absolute values of weights were equal to the minimum one, HapCompass chose the deleted one randomly, which led to produce uncertain solutions and decrease the reconstruction effect. Aiming at this problem, algorithm IHapCompass was proposed. It improved the rules of deleting edges to limit the random value effectively. IHapCompass took advantage of the relativity between the difference of fragment number of(00)/(11)and that of(01)/(10)and the total fragment number to ascertain the deleted edge. It made use of the probability of 0/1 in haplotypes to determine the SNP value for an isolated vertex, which ascertained the value of an isolated vertex. Experiments were implemented by using the real haplotypes. The results showed that under different parameter settings, the IHapCompass algorithm can obtain higher reconstruction rate than the HapCompass, the DGS and the Fast Hare algorithm, and has high efficiency. The IHapCompass algorithm could provide a reference for the study on reconstructing single diploid individual haplotypes.

Highly efficient algorithm for tracking explicit surface to process complex topological events

HOU Yan, YANG Meng

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  15-20.  doi:10.6040/j.issn.1672-3961.0.2016.028

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A new algorithm was put forth to accurately track the free surface with complex changing topology. This algorithm employed the explicit Lagrangian mesh to model the free surface, used the external velocity field to move the surface mesh and processed the surface geometry by using the local re-meshing techniques, which efficiently eliminated the self-intersection errors. By this algorithm, a voxel grid was used to effectively detect the regions where the topological events occurred. In the regions, the surface meshes were subdivided, the topologically incorrect meshes were replaced by the predefined templates and then an accurate sewing operation was performed to connect the reconstructed local meshes with the external meshes. Ultimately, the experimental results indicated that this algorithm could effectively handle the topological events of the explicit meshes, which was suitable for a liquid animation in the practical applications.

Anomaly detection in network traffic based on online feature selection

MO Xiaoyong, PAN Zhisong, QIU Junyang, YU Yajun, JIANG Mingchu

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  21-27.  doi:10.6040/j.issn.1672-3961.1.2016.078

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Traditional batch feature selection methods had the limitations in time and space when dealing large-scale backbone network traffic. A method based on online feature selection detection was proposed to address the limitations, which integrated the idea of online learning into the linear classification model. When selecting the features, the classifier was first updated by online gradient descent and projected to a L1 ball to ensure that the norm of the classifier is bounded, and then the truncate function was used to control the quantity of features. The analysis results showed that the proposed method could make a good use of the time-sequence property of traffic, reduce the time of anomaly detection and hold the similar accuracy when comparing with the batch methods, and meet the real-time demand of network traffic anomaly detection. The proposed method provided a new idea for the network traffic anomaly detection.

A new method for hand-eye calibration based on non-minimization optimization

ZHAO Zijian, CHEN Zhaorui, LI Bingqing

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  28-33.  doi:10.6040/j.issn.1672-3961.0.2015.319

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A novel hand-eye calibration method using non-minimization optimization was proposed based on the numerical analysis of hand-eye calibration problem. The hand-eye equation was described in the form of tensor, the cost function of non-minization optimization was proposed, and the corresponding estimation equation was solved by eign-computation. The perturbation analysis proved the accuracy of our method. In order to test our method, the experiments with both simulated and real data were performed. The experimental results showed that the proposed method avoided the iterative computation with starting values and had great robustness and validity. The motion selection was naturally matched with our method. Compared with other methods, the proposed method saved the computation time, reduced the computing errors, and could be regarded as a good option for real applications.

Traffic sign classification based on multi-feature fusion

WANG Bin, CHANG Faliang, LIU Chunsheng

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  34-40.  doi:10.6040/j.issn.1672-3961.0.2016.082

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In order to effectively improve the accuracy of the traffic sign classification, a new method was proposed through fusing the global and local features. First, local binary pattern(LBP)feature was extracted which could describe the internal texture information of traffic sign image, and then histogram of oriented gradient(HOG)feature which could represent shape information and global gist feature with description of the rough outline of the image information were extracted, and then linear combination was used to achieve feature complementary. The principal component analysis(PCA)was used for data dimensionality reduction. Final traffic sign training and classification was carried out using support vector machine(SVM)classifier. The experiments showed that with respect to a single feature extraction classification of traffic signs, the algorithm based on multi-featured fusion achieveed higher classification accuracy, but also met real-time requirements.

Application of improved K-means clustering algorithm based on density in distribution network block partitioning

JI Xingquan, HAN Guozheng, LI Kejun, FU Rongrong, ZHU Yanghe

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  41-46.  doi:10.6040/j.issn.1672-3961.0.2015.421

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Based on the position, number and capacity of the electric substations in the urban medium voltage distribution network, an improved K-means clustering algorithm based on density was proposed. The two aspects in the selection of the initial cluster centers and the optimal cluster number K were improved. And the evaluation function based on intra-cluster variation and inter-cluster variation was proposed to evaluate the quality of clustering results. The distribution network was divided into some suitable distribution grids. The substations that were close in distance were divided into the same grid, and each grid was independent of power-supplying, which avoided the contact between the substations that were too far away and provided support for the optimization of the network structure in the distribution network. The results of calculated example showed the effectiveness of the proposed method.

The complicated characteristics and connecting performance of the highway network evolution model

LIU Haoguang, WANG Haiwei, ZENG Huiping, WU Jiaju

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  47-53.  doi:10.6040/j.issn.1672-3961.0.2015.205

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The relationship between degree and degree distribution through the establishment of the network model of the expressway network was analyzed based on the complex networks theory, which showed that this type of network would eventually evolve into a scale-free network with a character of small world. In order to study the connected efficiency of the networks when subjected to different attacks, the highway network of Jiangxi province was attacked randomly and selectively and the result showed that the connected efficiency of the network had a great deal to do with the amount of the removed nodes, the network had a certain connected efficiency in different kinds of attacks, however, it quickly split into many subnetworks in a selective attack, its connected efficiency dropped sharply to 0 and the network was in a state of collapse in a short time, which could provide scientific basis for the planning and construction of the highway.

Path following controller for unmanned surface vessels based on ADRC

WANG Changshun, XIAO Hairong

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  54-59.  doi:10.6040/j.issn.1672-3961.0.2016.010

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A path following active disturbance rejection controller with parameters online optimization was presented for underactuated USV nonlinear system. USV mathematical model with uncertain dynamics and parameterized path navigation method was described briefly. A novel method based on dual population genetic algorithm with chaotic local search strategy was introduced to online optimize the ADRC parameters. Simulation results under different conditions were presented to show numerically that the path following controller worked as expected even though there existed uncertain dynamics, unknown disturbance and parameter perturbation in the marine environment.

Properties of anti-dispersing pervious concrete

SONG Xiuguang, ZHOU Jian, HOU Yue, GE Zhi, SUN Renjuan

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  60-67.  doi:10.6040/j.issn.1672-3961.0.2015.251

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The cement paste was first modified to obtain high segregation resistance and high fluidity performance. The impacts of cement-aggregate ratio, water-cement ratio and aggregate gradation on pervious concrete strength, density, porosity, and permeability were studied systematically. Experimental results showed that the anti-dispersion agent could effectively solve the problems of cement grout sinking and segregation. The cement-aggregate ratio could significantly affect pervious concrete performance, compared with a small impact by the water-cement ratio. The aggregate gradation also had impacts on the strength and porosity of pervious concrete. Based on the tests above, the mix proportion of pervious concrete for field construction was got. Field testing indicated that pervious concrete pile could be constructed by vibration method. The pervious concrete pile had good bearing capacity.

Dynamic shear creep characteristics of asphalt mortar

WANG Haipeng, ZHANG Rong, ZHANG Xiaohua, MAO Cheng, ZHOU Shuiwen

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  68-75.  doi:10.6040/j.issn.1672-3961.0.2016.006

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To consider the complex mechanical behavior of asphalt mortar and provide the data surpport for asphalt mixture micromechanics analysis, several asphalt mixture mixing ratios were transferred into asphalt mortar mixing ratios. Asphalt mortar molding device and discovery hybrid rheometer fixtures developed by ourselves were used to obtain the dynamic shear creep curves. Burgers model was used to fit the creep curves. The viscoelastic parameters of asphalt mortar under dynamic shear loading condition were obtained. The changing rules of the viscoelastic parameters and the relaxation modulus were analyzed. Results showed that Burgers model had good fitting effect on dynamic shear creep curve of asphalt mortar. The creep deformation of SMA-16 corresponding asphalt mortar was larger than AC-20 within the same loading time. Rubber asphalt mortar had the optimal shear creep resistant properties. The asphalt mortar creep deformation had the same influence rules with the general influence rules of asphalt miture rutting deformation. Test temperature, asphalt contant, type of asphalt and aggregate gradation all had obviously influence on asphalt mortar dynamic shear creep viscoelastic parameters and relaxation modulus.

Experimental research on two-sided shearing bonding property of fiber cement mortar to concrete

BU Liangtao, YUAN Haitao

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  76-82.  doi:10.6040/j.issn.1672-3961.0.2015.303

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The fiber cement mortar was mixed respectively with polyvinyl alcohol fiber, polypropylene fiber, steel fiber and appropriate admixtures in the mortar. By using a jack to take the two-sided shearing experiments of concrete species covered by fiber cement mortar, the study aimed to investigate the influence of fiber types, strength of concrete and strength of fiber cement mortar on the bonding property between concrete and fiber cement mortar. The results of the experiments demonstrated that the shear strength between concrete and polyvinyl alcohol fiber cement mortar was the highest, that of polypropylene fiber took second place, and the shear strength between concrete and steel fiber was the lowest. It was concluded that the higher the compression strength of concrete or compression strength of fiber cement mortar was, the higher the shear strength was. There was a positive linear correlation between shear strength and compression strength of fiber cement mortar. Thus this study, with various types of fibers and a wide range of the fiber strength researched, could provide a theoretical guide for the practical reinforcement engineering.

Application of strength reduction FEM method in slope stability analysis

LIU Jin, LI Qinchang, MA Xiuyuan

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  83-88.  doi:10.6040/j.issn.1672-3961.0.2015.387

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To study the influence of Quhe embankment cross-river bridge pile foundation project on the embankment stability, the FEM was applied to analyze the reinforcement plan of the embankment slope and the construction process. By generalizing the embankment cross-section diagram of the Quhe bridge, a two-dimensional plane strain FEM calculation model was built. The strength reduction FEM method was employed to analyze the circumstances of the designed slope broadening and pile-hole construction. The calculation results showed that the minimum stability safety factor reached 1.179 and met the specification required value 1.150 when the slope gradient was adjusted to 1.00∶3.00. The slope stability safety factor were all larger than 1.150 during the pile hole excavation and the slope stability could be guaranteed, while the seepage deformation and plastic deformation safety problems of pile hole wall existed and protective measures should be taken.

Development and application of after grouting device for prestressed concrete pipe pile

MI Chunrong, LI Jianming

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  89-95.  doi:10.6040/j.issn.1672-3961.0.2015.327

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To solve the problems that the after grouting devices could only achieve pile bottom grouting or pile side grouting and the structure was irrational, the design and optimization of after grouting device were put forth, and then were used in engineering. 3 kinds of after grouting devices were designed. Structure one was chosen to be optimized by analyzing the effect of grouting and the structure of the form. Reinforcement ratio of structure one was optimized by using finite elements analysis software ANSYS. In addition, the strength and rigidity of the injection channel were checked by the same way. The field application showed that the device performance was stable and reliable. The ultimate vertical bearing capacity of a single pile could be significantly improved. This device also had good effects on improving the performance price ratio of the pile. Compared to other after grouting devices, this device could realize the control of pile end and pile side grouting by pressure control for the first time, which could prevent slurry return and ensure pile end and pile side grouting quantity.

Support of the renewable energy base in northwest of China on the construction of global energy interconnection

ZHANG Hengxu, SHI Xiaohan, LIU Yutian, YANG Dong

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  96-102.  doi:10.6040/j.issn.1672-3961.0.2016.236

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The global energy interconnetion advocated by China is a promising way to build a modern energy supply system, which can achieve clean and sustainable use of energy. First, the relationship between the large-scale renewable energy base and the global energy interconnetion was analyzed from the point of view of the energy development strategy demand. Second, the advantages and potential of the construction of large-scale renewable energy base in the northwest of China were demostrated from the aspects of the natural conditions, social conditions and technical conditions. Finally, the significance and the support of the large-scale renewable energy base in northwest of China on the construction of global energy interconnetion were expounded based on the elaboration of the planning ideas of Asian super power grid and the future world energy patterns.

Synergetic physical-cyber simulation platform for global energy interconnection

CHU Xiaodong, ZHANG Rongxiang, HUANG Haoyi, TANG Maosen

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  103-110.  doi:10.6040/j.issn.1672-3961.0.2016.220

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The coupling mechanisms between physical and cyber systems of the global energy interconnection were explained briefly. The structural characteristics, simulation requirements, and associated tools were compared for multiple levels of energy networks. A synergetic physical-cyber simulation platform was constructed for the decentralized load control scenarios. The simulation results reflected the great impact of communication environment on the load control effects, which could be correctly modelled by the synergetic simulation platform.

Analysis of spatial and temporal distribution of wind power output and variation characteristics based on NASA observation data

LIU Xiaoming, NIU Xinsheng, ZHANG Yi, CAO Benqing, SHI Xiaohan,ZHANG Youquan, ZHANG Jie, AN Peng, WANG Yuan

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  111-116.  doi:10.6040/j.issn.1672-3961.0.2016.235

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In order to overcome the difficulties of acquiring operation data of the practical wind farms, an estimation method of wind energy resources based on the history wind speed has been put forward. First, the wind speed data was acquired from the NASA data center and was converted to the the output sequence of an imaginary wind turbine, and then the indexes such as expectation and probability of half load were calculated by statically analyisis of the wind turbine output sequence to evaluate the spatial and temporal distribution of the wind energy. Finally, the variance of the wind power output as well as the statistical law of the wind power output differences between adjacent peak and valley points were calculated to analyze the variation characteristics of the wind energy. The proposed method could take the nature of wind energy resources as well as the characteristics of wind turbine into consideration and quantitatively describe the variance of the wind power ouput. The method was used to analyze the wind energy resources in Shandong Province and the results showed that the technological available wind energy varies with regions, seasons as well as day and night in an obvious law.

Short circuit current limiting optimization of ultra-high voltage receiving-end power grid

ZHAO Kang, WANG Chunyi, YANG Dong, LIU Yutian

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  117-124.  doi:10.6040/j.issn.1672-3961.0.2016.240

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With the rapid construction of ultra-high voltage(UHV)power grid in China, the UHV transmission capacity was continuously improved, which could cause the exceeding of short circuit current(SCC), especially single-phase short circuit current(SSCC). The reasons of exceeding SSCC and dedicated limiting measure for SSCC were analyzed. Then, the limiting effectiveness and economy cost of different limiting measures were described as a unified form. An objective sensitity index was defined for limiting measure configuration object, which could be used to filter numerous configuration objects to avoid dimension disaster. With the economy cost and grid structure tightness as objective functions, a comprehensive limiting optimization model for ultra-high voltage receiving-end power system was founded. The self-adpative hybrid particle swarm optimization(PSO)algorithm was used to find the optimal limiting scheme. The case study of Jining region power system validated the effectiveness of the proposed optimization model.

Remote testing on harmonic adaptability of offshore wind turbines

ZHAO Weiguo, JIANG Zimin, LIU Yutian, WANG Chunyi

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(4):  125-130.  doi:10.6040/j.issn.1672-3961.0.2016.219

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The influence of long distance cable on harmonic adaptability test was analyzed, and the method for remote test on harmonic adaptability of offshore wind turbine was proposed in no-load condition based on the cable distribution parameter model. Based on double-fed induction generator(DFIG)system with load connected, the influences of different cable lengths and capacitance parameters on the resonant characteristics were compared. Wind turbine and wind farm composite filtering method was proposed. LCL active filter was designed to eliminate the high frequency harmonics of DFIG rectifier, and C-type filter at the point of common coupling(PCC)was applied to mitigate resonant harmonic, to provide reactive power as well. The simulation module was built in Simulink, and the proposed method was verified by the comparison of the harmonic without and with the designed filters.