Table of Content

  

20 October 2016
Volume 46 Issue 5

Image annotation refinement based on contextual graph diffusion

TIAN Feng, LIU Zhuoxuan, SHANG Fuhua, SHEN Xukun, WANG Mei, WANG Haochang

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  1-6.  doi:10.6040/j.issn.1672-3961.1.2015.316

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A new image annotation refinement method was proposed. The initial labels were firstly obtained by annotation methods. Then label relevant graph and visual relevant graph were constructed and mutually reinforced. The semantic optimization problem was formulated into a regularized framework on above undirected weighted graphs. With strategies like data partitioning, successive optimization and constraint relaxation, an approximate optimized solution was got. The refined result could be more related to the content of images by incorporating both visual content and contextual information. Moreover, the proposed method was robust with the partition granularity, and the complexity was approximately linear. Experimental results on large scale web image dataset showed that the proposed method outperformed others, and could achieve both efficiency and capability.

Evaluation of microblog users' credibility based on HITS algorithm

WU Shufang, XU Jianmin

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  7-12.  doi:10.6040/j.issn.1672-3961.1.2016.257

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Based on Sina-Microblog and HITS(hyperlink-induced topic search)algorithm, a new user's credibility algorithm that merged user interactions and blog contents was putted forward. The new algorithm firstly constructed two directed connection graphs based on user interactions and blog contents respectively, where nodes represented users and arcs embodied the direction relationship between users. Authority and hub of these two connected graphs was computed. The fusion authority was adopted as measurement to evaluate user's credibility. The data collected from Sina-Microblog as test set was used to conduct experiments. Threshold of credibility was obtained by repeated training, and then credibility curves of different algorithms were drawn to verify the feasibility and effectiveness of the new algorithm.

A method of collaborative filtering recommendation based on fuzzy information entropy

LIN Yaojin, ZHANG Jia, LIN Menglei, WANG Juan

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  13-20.  doi:10.6040/j.issn.1672-3961.1.2016.165

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The performance of collaborative filtering was restricted by the sparsity of rating data. To solve this problem, a novel similarity measure based on fuzzy mutual information was proposed. First, the definition of user fuzzy information entropy was given to reflect the uncertainty degree of rating preference. Then, the fuzzy mutual information between users was introduced to measure the similarity degree between users. Finally, the fuzzy information entropy based on similarity measure method was designed to calculate the similarity between users by considering not only the fuzzy mutual information between users but also user fuzzy information entropy. Experimental results on two benchmark data sets showed that the fuzzy information entropy based similarity measure method could reduce the influence of the data sparsity, and the recommendation performance of systems had significant improvements.

Multi-objective scheduling in no-wait flow shop using a hybridized differential evolution algorithm

DENG Guanlong, YANG Hongyong, ZHANG Shuning, GU Xingsheng

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  21-28.  doi:10.6040/j.issn.1672-3961.1.2016.215

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To sovle the no-wait flow shop scheduling with the makespan and total flow time criteria, a multi-objective differential evolution algorithm hybridized with variable neighborhood search(MDEVNS)was proposed. A diversified population initialization method was proposed by using the improved Nawaz-Enscore-Ham(NEH)heuristics. The updating operations of mutant, trial and target individuals were developed in differential evolution. To improve the multi-objective searching ability, a multi-objective variable neighborhood search was embedded in the algorithm. The computational experiments based on Taillard benchmark set revealed that the MDEVNS yielded Pareto front solutions with better diversity and performance than the multi-objective simulated annealing algorithm and the non-dominated sorting genetic algorithm, and the effectiveness of the MDEVNS for multi-objective scheduling in no-wait flow shop was proved.

A local collaborative filtering algorithm based on ranking recommendation tasks

HUANG Dan, WANG Zhihai, LIU Haiyang

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  29-36.  doi:10.6040/j.issn.1672-3961.2.2015.008

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Based on matrix factorization model, time factor and ranking problem, a collaborative filtering algorithm was proposed. The method relaxed the low-rank assumption of rating matrix and assumed that the rating matrix was locally low-rank,which meaned that the rating matrix was low-rank in the neighborhood of certain user-item combination. Mean reciprocal rank(MRR), an evaluation metric widely used in Information retrieval, was modified to fit the rating dataset. The evaluation metric was smoothed and simplied, and then was optimized. The algorithm was easy to parallelize and could operate on real data set. Experiments showed that this algorithm could improve recommendation performance.

Qualitative balanced clustering algorithm based on Hartigan-Wong and Lloyd

ZHOU Wang, ZHANG Chenlin, WU Jianxin

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  37-44.  doi:10.6040/j.issn.1672-3961.1.2016.031

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The traditional Hartigan-Wong clustering algorithm could cause the unbalanced clustering problem. To solve this problem, Charl which is a novel qualitative balanced clustering method was proposed to improve the balance level while the absolute balance was not required. Charl combined ideas from both the Lloyds method and the Hartigan-Wong method, Charl proposed an adaptive tuning strategy to tune the balance level. This algorithm was a batch processing method, which shared the efficiency benefits of the Lloyds method. Experiments on 13 benchmark datasets showed that Charl not only produced more balanced output groups, but also achieved lower cost values and higher clustering performances(in terms of accuracy, normal mutual information and time cost)than the Lloyds method. This qualitative balancing method also outperformed the quantitative balanced clustering method by a large margin.

Robotic manipulators tracking control based on adaptive terminal sliding mode controller

TANG Qingshun, JIN Lu, LI Guodong, WU Chunfu

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  45-53.  doi:10.6040/j.issn.1672-3961.0.2016.328

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A self-adaptive second-order terminal sliding mode controller was proposed to achieve trajectory tracking control of robotic manipulators with uncertainties. The self-adaptive second-order terminal sliding mode algorithm was designed for a class of nonlinear uncertain system. The discontinuous sign function was included in first time derivative of control item, and the actual control input was continuous. The self-adaptive law method was employed to conquer system uncertainties, of which the upper bounds were unknown in advance, and the system stability was proved based on Lyapunov criterion. The robotic manipulators self-adaptive terminal sliding mode trajectory tracking control scheme was proposed. Simulation results for two-link robotic manipulator demonstrated the effectiveness of the proposed control strategy.

Hand-eye calibration and visual servo control for mobile manipulator

YANG Yuanhui, LI Guodong, WU Chunfu, WANG Xiaolong, CAI Xiaowei

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  54-63.  doi:10.6040/j.issn.1672-3961.0.2016.262

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The eye-in-hand visual servo system integrated vision sensor into mobile manipulator was widely used for object grasping and delivering operation. However, there were some challenges, such as nonlinearity and complexity of the existing hand-eye calibration algorithm, together with the nonholonomic constraint of the mobile manipulator. To solve these problems, the mobile manipulator was proceeded as a generalized manipulator whose kinematic model was established, and the inverse kinematic analytical solutions were acquired. Then, a novel linear active vision based camera calibration method was proposed to determine the hand-eye relationship. Finally, a visual servo switching control law composed of eye-fixed approaching and look-then-doing open loop handling was designed to control the mobile manipulator to finish household objects handling operation. Simulation and experimental results showed that the linear active vision-based hand-eye calibration method could be utilized conveniently and precisely. Meanwhile, the designed control law could reduce the control difficulty brought by the nonholonomic constraint of the mobile manipulator.

An IMC-PID robust control method for process of integrator plus time delay

HOU Mingdong, WANG Yinsong, TIAN Jie

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  64-67.  doi:10.6040/j.issn.1672-3961.0.2015.407

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For the integrated plus time delay in industrial system, a design and parameters tuning approach of internal model control PID(IMCPID)controller was proposed. The integrator in the model was replaced by a first-order lag, the steady-state performance of the system was improved, the time-delay term in the model was approached with the first-order Taylor expansion, and the design method of IMC-PID controller was founded. The analytical expression for robust tuning the adjustable parameter of the IMC-PID controller was derived based on the robustness index of the control system. The simulation results showed that the proposed method could provide a better dynamic performance and robustness against parameters perturbation, and the blindness of conventional method for controller parameter tuning was overcome.

A review of mechanics of asphalt pavement disease

CUI Xinzhuang, HUANG Dan, LIU Lei, LAN Riyan, LYU Haibo, ZHAO Yanlin, CAO Weidong, CHANG Chengli

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  68-87.  doi:10.6040/j.issn.1672-3961.0.2016.368

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To promote the development of disease mechanics of asphalt pavement, major mechanical models and mechanisms of pavement disease were elaborated by means of summarizing previous researches. Research results of asphalt pavement permanent deformation and primary prediction techniques of rutting were presented. Against the fracture damage due to repeatedly loads, failure mechanics models of asphalt material were studied. The moisture damage mechanism was analyzed from the micro perspective and the effect of moisture on asphalt pavement was introduced based on fluid-solid coupling dynamics. The traffic-load-induced attenuation of pavement skid-resistant performance was significant, so the wear mechanism and the effects of different factors on skid-resistant were analyzed.

Influence of squeezed branch pile bearing capacity on different numbers and positions of enlarged parts

LI Lianxiang, LI Xianjun

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  88-94.  doi:10.6040/j.issn.1672-3961.0.2016.153

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The squeezed branch pile behavior and its internal working mechanism had been deeply investigated by simulating the field test and designing34 comparison models. According to vertical comparison on piles with the same number of enlarged parts, conclusions had been made that skin friction played a main role in the former stage but enlarged part resistance played later. A deeper enlarged part position could lead to a higher later-stage bearing capacity and a slower settlement curve. While lateral comparison on piles with different enlarged part number showed bearing capacity improving efficiency rule and enlarged part resistance efficiency rule: too many enlarged parts could reduce the bearing capacity improving efficiency and affect the performance of the enlarged parts. To achieve the best in economy, the suggested optimal number of enlarged parts was 2-3, which could provide reference for engineering.

Mechanical performance of prestressed anchor plate retaining wall

ZHANG Hongbo, XIE Quanyi, YUE Hongya, CUI Qi, SUN Runsheng, WANG Ke

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  95-101.  doi:10.6040/j.issn.1672-3961.0.2015.420

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In order to study the influence of lateral prestressed force and upload on the distribution of earth pressure on the anchor-plate retaining wall and anchor plate and shear stress of wall, a serial of retaining wall model tests and numerical simulation were put forth. The influence law of the different loads to the mechanical features of anchor-plate retaining wall was found. Results showed that, under prestressed force action, the distribution curve of lateral soil pressure of retaining wall was like a parabolic with the peak value around anchored bar. Earth pressure before anchor plate was a saddle distribution along the width of plate with the expanding degree, 35°. In addition, along the axis of prestressed cable, the influence area of earth pressure of anchor plate was about double width of anchor plate. Under upload action, the distribution curve of lateral earth pressure of retaining wall was like an alphabet S curve. There was a big shear stress area near the rooting of retaining wall, where should be strengthened by increasing ratio of reinforcement. Conclusion of this study could provide reference for the population and application of prestressed anchor plate retaining wall in highway engineering.

Effect on the performance of shotcrete mixed with silica fume and fly ash

ZHANG Luchen, LI Shuchen, LI Shucai, LIAO Qikai

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  102-109.  doi:10.6040/j.issn.1672-3961.0.2015.391

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To solve the problems of shotcrete in the field, such as the low strength, much cracking, high rebound and dust concentration, adding different mass ratio of silica fume and fly ash to replace the cement in the shotcrete, the influence of silica fume and fly ash on the performance of shotcrete with aluminate liquid accelerator was studied through laboratory and field tests. The results showed that the coagulation effect was the best when the dosage of aluminate liquid accelerator was 3% of cementing material. A silica fume dosage of 8% could effectively promote the coagulation effect of aluminate liquid accelerator, and improve the strength and the cohesiveness of concrete. The addition of fly ash could reduce the coagulation effect of accelerator, reduce the strength and improve the workability of concrete. The addition of silica fume, fly ash and aluminate liquid accelerator affected the 1d compressive strength of concrete, and the order of influence factors was fly ash content>accelerator dosage>silica fume content. The order of influence factors for 28 d compressive strength of concrete was accelerator dosage>silica fume content>fly ash content. Based on the above analyses, the optimal proportion was obtained. Combined with a new spraying technology in-situ, the best combination could effectively reduce cement amount, improve shotcrete strength, reduce cracking, and lower rebound and dust.

Study on the circulating Pushover on ductile ability of pillar piers caused by axial compression ratio

ZHU Jun, ZHAO Jianfeng, CHEN Zhijian

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  110-115.  doi:10.6040/j.issn.1672-3961.0.2015.382

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Nonlinear FE models of cylindrical bridge piers were established using ABAQUS. Failure process of cylindrical bridge piers including protective layer, core area concrete, stirrups and longitudinal reinforcement were simulated using Pushover analysis with cycle loading. The effects of axial compression ratio on ductility failure of cylindrical bridge piers were studied. Numerical results showed that the failure time of core area concrete was shortened with increasing of axial compression ratio. While first yield time of protective layer and core area concrete, stirrups and longitudinal reinforcement had no significant impact rules to follow. Within certain range, displacement ductility coefficient decreased with increasing of axial compression ratio, which showed that proper axial compression ratio would improve ductility seismic ability of bridge piers. Results also showed that cylindrical piers hysteretic energy capacity increased with the axial compression ratio decreases.

The influence of transmission loss on the cold of Stirling cryocooler

WEI Lulu, LAI Yanhua, LU Yongda

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  116-119.  doi:10.6040/j.issn.1672-3961.0.2016.165

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To consider the characteristics of cold transmission loss between Stirling cryocooler and large infrared focal plane, the thermal radiate loss, heat conduction loss and linking loss were studied in the process of transmission of cold. The coating of dewar, the layers of cold chain, the numbers of supporting column and reducing radiate loss in the process of the transmission with the single sided aluminum plating were studied by the experiment using self-developed refrigerator col transmission. The results showed that surface area of the dewar is greater than coating in the thermal radiate loss, the package way was adopted to improve the radiate loss, the heat conduction kept constant when the structure of the stanchion were fixed, and the transmission loss had a good advantage with 6 layer 0.1 mm thickness of the cold chain. The research is helpful to improve the efficiency of refrigeration.

Comprehensive performance test and analysis of adsorbent

DONG Zhen, LAI Yanhua, LYU Mingxin, ZHENG Haoyu, PAN Jihong

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  120-125.  doi:10.6040/j.issn.1672-3961.0.2016.255

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In order to overcome the limitations and measurement errors of adsorption performance by volumetric method, thermostatic water-bath was inducted to reduce measurement errors caused by temperatures fluctuation of gas tank and gas condensation. Uniform reaction and highly sensitive sheathed thermocouple was realized by a novel reactor. Volume of each part was accurately calibrated by precise bearing steel-balls, and relative error of volume was not more than 0.5%. Based on error impress principle,relative error of the measuring system was lower than 2%, and comprehensive performance test and analysis of adsorbent was satisfied.According to principle of volumetric method and adsorption characteristics of alkali halide salts, the new test processes of equilibrium state, kinetic and decay were designed, and were used to test ad-/desorption performance of CaCl₂ and its composite adsorbents. The equilibrium curves and pseudo equilibrium area were obtained. Tests of ad-/desorption kinetics and temperature curves during temperature and pressure changes, and methods of quantitative and qualitative analyses were achieved. Adsorption kinetics curves and maximal adsorption capacity after variant ad-/desorption cycles were given. Application range of volumetric method was extended. Feasibility of measuring system and test processes was confirmed, which could provide highly efficient testing theory and analyze methods in the research process of adsorbent.

Coupling calculation between thermal model and air leakage model of quad-sectional rotary air preheater

CHU Da, SHI Yuetao, WANG Xiaojuan

JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2016, 46(5):  126-130.  doi:10.6040/j.issn.1672-3961.0.2016.036

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In order to analyze the heat transfer performance and low-temperature corrosion resistance property of quad-sectional rotary air preheater, the thermal and air-leakage calculation model were built and a concept named low-temperature area rate was proposed. With the air leakage ignored, thermal model was solved by numerical finite difference method based on control equations of rotary air preheater and temperature distribution was acquired. The energy and mass equations of air leakage were solved according to the results of thermal calculation and air leakage rate was obtained. Then iterative calculation of these two models was carried out in accordance with inlet and outlet parameters. The results showed that the difference between the calculated value and the designed value was less than 5%. Air leakage of quad-sectional air preheater was much less than that of tri-sectional one with the same heat transfer area. The temperature distributions of fluids in different channels were continuous and consistent with matrix. The low-temperature area rate was reduced with the decline of inlet gas flow along the direction of rotary, which helped to avoid low-temperature corrosion.