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Table of Content

      
    20 June 2013
    Volume 43 Issue 3
    Articles
    A proactive recommendation model  adapted to users′ changing requirements
    XU Chunyao1,2, CHEN Mingzhi3*, YU Lun1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  1-6. 
    Abstract ( 278 )   PDF (1886KB) ( 1242 )   Save
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     In order to reduce the potential interference with users′ current activities through proactive recommendation and improve the users′ experience, a proactive recommendation model of adapting to users′ changing requirements was proposed. This model concerned with the users′ potential demands for proactive information given by the system, and especially the volatility of those demands. This model adopted an acceptance vector to evaluate the user′s demand for proactive information,  and the decision tree algorithm was  applied to conduct rule-based reasoning by means of the user′s historical context, and then the users′ acceptance vectors for context recommendation was given. The recommendation acceptance vectors could be adjusted according to the changing  context and user′s feedback. The experimental results showed that the proposed  model could adaptively respond to the users′ changing requirements, which was helpful to improve the user experience.

    The mining of hot events based on information flow of short message texts
    LIU Jin-ling1, WANG Xin-gong2, ZHOU Hong1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  7-12. 
    Abstract ( 319 )   PDF (1259KB) ( 1236 )   Save
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    The text information flow of SMS had carried abundant information resources. In order to find out the hot events behind it, an online sorting algorithm was  given for the text information flow of SMS. This method  used the co-occurrence frequency of feature words to define its relevance. And the similarity of message texts was  defined on the basis of preamble information collection and information frequency. Furthermore, after each time period of clustering,  the clustered SMS texts were classified periodically. This algorithm had higher efficiency to find hot events for a large number of short text information retrieval. Moreover, this algorithin  reduced the possibility of false detection and missed detection. Based on the comparison of experiments on algorithms between real data sets and Single-Pass, the  results  showed that  each index was improved to some degree.

    The algebraic structure of α-resolution fields based on lattice-valued logic systems LP(X)
    LIU Yi1,2, JIA Hai-rui2, QIN Xiao-yan2, XU Yang2 *
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  13-18. 
    Abstract ( 329 )   PDF (844KB) ( 1048 )   Save
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    First, the generalized literals set D*α (g), which couldn′t be α-resolved with a fixed generalized literal g, was a ∨-semigroup and an order filter. Second, a new algebraic structure Df  determined by D*α(g) was a lattice filter, and the properties of D were investigated. Finally, the algebraic structure κ(D)  was determined by Df, the fact that  κ(D) was a filter was obtained and the structure of κ(D) was studied.

    Optimization of job-shop scheduling problem based on chaos particle swarm optimization algorithm
    ZHANG Fei, GENG Hong-qin
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  19-22. 
    Abstract ( 309 )   PDF (1140KB) ( 979 )   Save
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    In order to improve the job-shop scheduling efficiency, a JSP optimization method based on chaos particle swarm optimization algorithm was proposed. First, the machine shortest processing time was taken as the optimization target to create a multiple constrained job-shop scheduling model, and then the particle swarm optimization algorithm was used to solve the model, and chaos mechanism was adopted to maintain the diversity of particles. The simulation tests showed that the proposed method could get the optimal job-shop scheduling scheme, which showed some application values.

    Optimization of bank counter setting based on queuing theory
    CAI Wen-jing1, GE Lian-sheng2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  23-29. 
    Abstract ( 417 )   PDF (829KB) ( 1523 )   Save
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    In order to reduce the waiting time of customers in the current banking system, a queuing theory based optimization model of banking queuing system was developed. The process of conducting service at the bank counters was regarded as random service system. A detailed design of bank counters’ optimization was given based on the basic features of this system. Additionally, a concrete analysis of the system optimization using queuing theory according to two respective aims was presented, and then a new way to decide the appropriate number of bank counters was illustrated with an example.

    Controller design of stochastic fuzzy systems based on the semi-tensor product method of matrices
    GE Ai-dong1, 2, WANG Yu-zhen1*, WEI Ai-rong1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  30-37. 
    Abstract ( 238 )   PDF (1078KB) ( 1119 )   Save
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    The stochastic fuzzy logic and controller design of stochastic fuzzy systems were investigated based on the theory of semi-tensor product of matrices, and some new results about stochastic fuzzy logic and stochastic fuzzy systems were obtained. First, some concepts and properties on stochastic fuzzy logic were given. Then, the design of stochastic fuzzy controller was studied based on the semi-tensor product method, and the new expression of stochastic fuzzy rules was presented. Based on the new expression of fuzzy rules, the complex stochastic fuzzy reasoning was converted into the simple algebraic equation by constructing the structure matrix and the transition probability matrix. Finally, a numerical example was provided to demonstrate our new results.

    Fuzzy DEA evaluation model and its application of vehicle routing in tobacco distribution center
    HU Hong-chun1, SHI Qing-sheng2, HU Xiao-yu3
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  38-42. 
    Abstract ( 255 )   PDF (1071KB) ( 1274 )   Save
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    In order to further optimize the vehicle routing in tobacco distribution centers, a vehicle routing evaluation model based on data envelopment analysis (DEA) method was proposed. The preliminary of DEA was introduced first. Then, a fuzzy DEA evaluation model was established, whose inputs were vehicle number and mileage and outputs were customer satisfaction, total distribution area, application degree, and customer number. Finally,taken certain distribution system with 13 tobacco distribution centers as the examples, the technical efficiency, scale efficiency, and technique-invalid slack variables were evaluated using proposed model, and the optimal distribution scheme was reported.

    Modeling for traffic overflow mechanism and its simulation on urban arterial road
    SHI Xiao-wei, ZHU Wen-xing*, WANG Qing-yan, SHAO Shi-yu
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  43-48. 
    Abstract ( 260 )   PDF (1826KB) ( 1658 )   Save
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     The queue length was obtained by the video detector, shockwave theory and cumulative input-output techniques were combined to conduct the traffic spillover occurrence mechanism model based on physical queue. The estimate methods of dynamical queue length, duration time of a spillover and average overflow queue length were included in the model. At last, the comparison  between the results of simulation and model were conducted,  and the results showed the new model could reflect a more practical situation.

    Robust memory state feedback non-fragile H∞ control of an uncertain neutral stochastic time-delay systems
    ZHOU Li-na1, LIU Xiao-hua2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  49-56. 
    Abstract ( 169 )   PDF (922KB) ( 919 )   Save
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    The problem of robust and non-fragile stabilization and robust non-fragile H∞ control for a class of neutral stochastic time-delay systems with normbounded parameter uncertainties was studied. The sufficient conditions  ensuring the closedloop system meansquare asymptotically stable were established With the additive and multiplicative gain uncertainty in the controller, based on the Lyapunov functional, Ito formula and Schur theory. Furthermore, the sufficient conditions were obtained for the solvability of robust non-fragile H∞ control of the uncertain system. The memory state feedback non-fragile H∞ controllers of the stochastic neutral delay system were designed by solving linear matrix inequality. The numerical example was provided to illustrate the effectiveness of the proposed design method.

    Theoretical investigations on the mutual interaction of one glycine molecule with  pristine and H-modified single-walled carbon nanotubes
    TIAN Chun-hua1,2, ZHAO Hua1,2, YAN Hui1,2, WU Juan1, LIU Ji-feng1,HU Hai-quan3, CHEN Xiao-hua4, ZHANG Chong1,2*
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  57-62. 
    Abstract ( 200 )   PDF (2210KB) ( 961 )   Save
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    The interaction modes of one glycine molecule with prinstine and H-modified (3, 3) armchair single-walled carbon nanotubes were investigated based on PW91/DND and PW91/DNP method. The geometries and energetical changes of each mode were explored. The H-bonds influence on the interaction energies between Glycine and ASWCNT or ASWCNT-H were discussed. The calculations suggested that the binding energy (ΔE) between glycine and CNT (ASWCNT-H) falled in the scope of 10~ 20kJ/mol, which belonged  to the weak interaction. Compared with the interaction  with ASWCNT, the binding energy of Gly with ASWCNT-H increased about 3~4kJ/mol. The electron transfer values from Gly to ASWCNT (or ASWCNT-H) were closely related with their mutual binding strength.

    Kinetic and thermodynamic studies on the adsorption of tetracycline onto graphene
    QI Zhen, YU Shu-yan, LIU Lu, WANG Shu-guang*
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  63-69. 
    Abstract ( 247 )   PDF (1546KB) ( 1665 )   Save
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     The graphene(GR) was prepared via a facial oxidationreduction method, and  its adsorption behavior with tetracycline(TC) was also studied. The characterization results, such as X-ray diffraction and transmission electron microscopy (TEM) observations, showed that the synthesised GR possessed laminated structure and high surface area. The effects of pH, adsorption time and temperature on the interaction between TC and GR were investigated by the equilibrium adsorption method. The results were fitted by the equation of adsorbent kinetics and isothermal curve. The optimal pH condition for the adsorption process ranged from 4.0 to 7.0. The adsorption reached at the balanced state in 20 minutes and the adsorption process could be well described by the pseudo second order model. The maximum adsorption capacity was respectively 172.1,  278.2, 467.6mg/g at 293, 303, 313K. The adsorption process was spontaneous and endothermic in nature, which could be described well by Freundlich isotherm. The electrostatic interaction, van der Waals forces and π-based interaction might be the adsorption mechanisms of TC adsorption on GR.

    Effect of organic alkali ethanolamine on the interfacial tensions of Shengli crude oils
    SHI Jing
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  70-74. 
    Abstract ( 254 )   PDF (1333KB) ( 1472 )   Save
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    The dynamic interfacial tensions between organic alkali ethanolamine and Shengli crude oils from five different blocks were investigated using the spinning drop method. The influence of different types of inorganic alkalis on the interfacial tensions of crude oils was compared with that of organic alkali. Experimental results showed that ethanolamine could react with petroleum acid to effectively reduce the interfacial tensions, and the ultra-low interfacial tension could be obtained at the optimum condition. The interfacial tensions between organic alkali solutions and crude oils were determined mainly by the content and structure of petroleum acids in the crude oils, and accordingly, the dynamic interfacial tensions showed quite different behaviors between ethanolamine and crude oils from different blocks. For both organic and inorganic alkalis, the weaker the alkalinity was, the lower the pH value needed to react with crude oil.

    Variable fuzzy evaluation method to production and living standard of reservoir resettlement and its application
    ZHENG Cong-qi1, XU Yan-gang2, ZHAO Sheng3, GUO Xiao-na1, GUAN Qing-shuo1, REN Chun-feng1, WEI Ze-biao1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  75-81. 
    Abstract ( 239 )   PDF (1176KB) ( 1366 )   Save
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    Based on the variable fuzzy set theory, the reservoir region immigration′s production and living standard was evaluated. First, the index system was constructed and the membership degrees were calculated, which was involved in immigration′s production and living standard, and then the variable fuzzy recognition model was established. Second, several different models were constructed to evaluate  the reservoir region immigrations′s production and living standard by varing the model parameters and weights of all indicators. Finally, the grade characteristic values of every model were calculated, and their stability was checked. This evaluation could properly determine the assessment level of the sample, which depended on the average values of the grade characteristics of the proposed models. This method was used to evaluate the reservoir region immigration′s production and living standard of Liangshan County in Dongping Lake reservoir. The example evaluation results proved the feasibility and reliability of this method.

    Cyclic carbonation characteristics of limestone modified by waste wood vinegar
    LIU Chang-tian1, LI Qing-liang2, LI Ying-jie1*, SUN Rong-yue1, LU Chun-mei1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  82-86. 
    Abstract ( 219 )   PDF (1879KB) ( 1377 )   Save
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    In order to improve the CO2 capture capacity of limestone in the cyclic calcination/carbonation cycles for coalfired power plants, the limestone was modified by the waste wood vinegar. The cyclic CO2 capture behavior of the modified limestone was investigated in a calcination/carbonation reactor. The carbonation conversion was calculated according to change of the sample in the cyclic reactions, which characterized CO2 capture capacity of the sample. The phase and the microstructure of the modified limestone were examined by XRD (X-ray diffraction) and SEM (scanning electron microscope) analysis to reveal the reaction mechanism. The results showed that the cyclic carbonation conversion of the limestone was enhanced after the modification treatment. The modified limestone with lower ratio of limestone/waste wood vinegar got, higher carbonation conversion. The optimum ratio of limestone to waste wood vinegar was 20g/400mL. The modified limestone exhibited the highest cyclic carbonation conversion at 700℃. The modified limestone showed higher sintering resistance than the limestone at the high calcination temperature. The carbonation conversion of the modified limestone after 20 cycles achieved 46% at the optimum reaction conditions, which was 2.9 times higher than that of the limestone. The main composition of the modified limestone was the calcium acetate hydrate. The calcined modified limestone demonstrated better microstructure in the multiple cycles,  compared with the limestone which was suitable for cyclic CO2 capture.

    Fluid-to-fluid modeling of critical heat flux in horizontal helically coiled tubes
    TAN Lu-zhi, HAN Ji-tian*, CHEN Chang-nian, KONG Ling-jian, JI Cui-lian, LU Guo-qiang
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  87-93. 
    Abstract ( 194 )   PDF (2786KB) ( 959 )   Save
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    In order to assess the effect of the classical fluid-to-fluid modeling technique of critical heat flux (CHF) applied to horizontal helically coiled tubes, CHF experiments for HFC-134a flow boiling in horizontal helically coiled tubes heated with high power DC source were carried out. The results of applying Ahmad and Katto model indicated that the flow scaling factor determined with the two models produced bigger errors for CHF modeling in horizontal helically coiled tubes, and both Ahmad and Katto model overestimated the experimental data. Based on the data analysis, an empirical correlation for flow scaling factor was proposed. The calculation results showed that this correlation predicted the CHF in horizontal helically coiled tubes under the experimental conditions within an error band of ±20%, and was obviously superior to Ahmad and Katto model in precision.

    Design methodology of ternary logic circuit on resonant tunneling diode
    WEI Yi 1, SHEN Ji-zhong 2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  94-98. 
    Abstract ( 226 )   PDF (1484KB) ( 1421 )   Save
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    A new operator was introduced based on the switch-signal theory to describe the operating principle of ternary monostable-to-multistable transition logic element. A novel ternary RTD circuit topology and corresponding method were also proposed, which could make the design process straightforward to simplify the switch functions and implement the circuit with transistor networks. Furthermore, it could also avoid modifying the parameters of RTD in the process. Finally, the circuits were verified by simulation with extensively validated models.

    Design of highperformance CML ternary D flipflop based on BiCMOS
    ZHAO Xiang-hong1, 2, SHEN Ji-zhong2*
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  99-104. 
    Abstract ( 238 )   PDF (1850KB) ( 1303 )   Save
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    A simple-structure high-performance CML ternary D flip-flop based on BiCMOS was proposed, which combined both advantages of BiCMOS and CML circuits, and included high-speed and strong drive ability of BiCMOS circuits and high speed low swing and low noise of CML circuits. Using TSMC 180nm process, the results of simulations carried out by HSPICE illustrated that the proposed circuit could not only have correct logic function, but also gain improvements of 95.6%-98.4% in average D-Q delay and 16.2%-96.8% in PDP compared with the advanced ternary D flip-flops. Furthermore, the work frequency  could perform up to 15GHz. All of the results proved that the proposed circuit was suitable for high-speed and high-frequency applications.

    An antiislanding protection technique based on the characteristics of faulted current
    YU Qing1, LU Xiao-hui2, HAN Yao-peng2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2013, 43(3):  105-110. 
    Abstract ( 210 )   PDF (2043KB) ( 977 )   Save
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    A new anti-islanding protection technique was proposed based on the characteristic of faulted current. This method artificially created short circuit in the port of distributed generator to produce a faulted pulse current, which could effectively reflect the change of the system impedance. The islanding status could be judged through monitoring and analyzing the faulted pulse current. The equation of the faulted pulse current was derived, and the criteria for the islanding determination were set up. Disturbance between signals and the effect on the system were also analyzed. Finally, this method was validated by theoretical analysis and computer simulation.