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Table of Content

      
    16 August 2010
    Volume 40 Issue 4
    Articles
    Multi-robot hierarchical reinforcement learning based on semi-Markov games
    SHEN Jing, LIU Hai-bo, ZHANG Ru-bo, WU Yan-xia, CHENG Xiao-bei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  1-7. 
    Abstract ( 255 )   PDF (983KB) ( 1236 )   Save
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    Following previous work and considering the multi-robot systems with communication failure (e.g. in an underwater environment), a multi-robot hierarchical reinforcement learning approach based on semi-Markov games was proposed.  The game theory was employed in this approach. Simulation experimental results showed that the proposed approach was effective on multi-robot learning with communication failure.

    A new feature selection method for text categorization
    WANG Fa-bo, XU Xin-shun
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  8-11. 
    Abstract ( 211 )   PDF (342KB) ( 2799 )   Save
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    How to reduce feature dimension while maintaining categorization accuracy is a key issue of text categorization.  A new method based on information theory was proposed to solve this problem. This approach aims to eliminate sparsely distributed features and find features  useful for categorization. Working with these feature reduction methods, it could  further reduce the feature dimension. The performance of  this  proposed method was tested on benchmark text classification problems. The results showed that it could not only reduce the feature dimension to hundreds but also improve the performance.

    Computation model of human vowel system evolution based on meme
    YUN Jian1,3, JIANG Di1,2, PAN Wu-yun1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  12-18. 
    Abstract ( 307 )   PDF (1371KB) ( 1186 )   Save
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    The human vowel system shows a remarkable universal rule. The research on human vowel system evolution and its computation is both part of a larger research effort into understanding the nature of intelligence, and an important issue in life and linguistics research areas. There is almost no literature to our knowledge in our country, whereas  research has become a hotspot abroad. First, the weakness of an existing human vowel system evolutionary model was analyzed. Then, meme theory and cultural evolution were described.Sequentially, vowel formants independent of specific language were given and synthesis function from vowel’s tongue position and lip roundness to vowel formants was constructed. Finally, a computational model blending vertical structure (inheritance) and horizontal structure (communication) for a human vowel system evolution was brought forward based on meme theory. Simulation experimental results indicated the effectiveness,   illustrated the universal and the rule of the human vowel system from both macro and micro levels.

    Speech signal representation and feature extraction based on ICA
    DONG Zhi-qiang1, LIU Ju1, ZOU Xin2, DU Jun1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  19-22. 
    Abstract ( 310 )   PDF (958KB) ( 2260 )   Save
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    A mathematical derivation was presented to demonstrate the effectiveness of the independent component analysis (ICA) based on signal representation for non-Gaussian speech extraction when corrupted by Gaussian noises. In experiments, the features based on ICA were applied to the speaker identification task. Experimental results showed that the performance of  features based on ICA could get obvious improvements compared with the traditional mel-frequency cepstral coefficients (MFCC) features obtained by discrete cosine transform (DCT).

    Survey on predictive representations of state
    WANG Li, GAO Yang, WANG Wei-wei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  23-28. 
    Abstract ( 333 )   PDF (436KB) ( 1215 )   Save
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     Predictive state representations (PSR) is a novel method for modeling discrete dynamic systems. PSR represents the system′s state using a set of prediction vectors of action-observation sequence. It surveyed basic concepts, problems, methods and latest extended applications of PSR, and points out the development future of the PSR model.

    Robotic localization and power-efficient wireless networking by using multiple antennas
    SUN Yi, XIAO Ji-zhong*, Flavio Cabrera-Mora
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  29-35. 
    Abstract ( 258 )   PDF (849KB) ( 582 )   Save
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    A biologically-inspired swarm of robots with collaboration towards a common mission has a broad range of applications. However, the required dynamic localization among autonomous robots through effective wireless communication for such swarm collaboration, though usually implicitly assumed, has not been properly addressed. In this article, we analyze the use of multiple antennas in the dynamic networking of a swarm of robots. Following the gradient of signal powers along a trajectory, a robot can track the direction of a source robot. With three or more properly placed antennas that sense different phase shifts of the carrier, a robot can localize a source. By lateration,  three collaborative robots can localize a source with known distances to it. Via angulation technique, and three robots can determine their geometric relationship with knowing two angles and one distance between them. On the basis of knowledge of robot locations, beamforming techniques can be employed to receive and transmit a signal towards the desired robot therefore improving power efficiency and prolonging robot lifetime. The techniques can be extended from 2-D to 3-D space for application of wall-climbing robots.

    An image segmentation method based on mean divergence
    WANG Xin-pei1, LIU Chang-chun1*, BAI Tong2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  36-41. 
    Abstract ( 286 )   PDF (2111KB) ( 802 )   Save
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    In the research of medical image segmentation, it is difficult to determine the number of segmentation classes. To solve the problem, a novel measurement for determining the number of classes named mean divergence function was formed according to the relation among three common means. And then an image segmentation method based on mean divergence and simulated annealing was proposed. In this method, the mean divergence function is used as an optimization object and simulated annealing is used as an optimization method to find the optimal segmentation threshold in overall search space. This overcomes the shortcomings of fuzzy C-means (FCM) clustering algorithm, such as it is hard to determine the number of classes and easy to get into a local extremum. Experimental results show that this method could automatically segment the medical image with focus, and the speed had significant improvement compared with the method based on mutual information.

    Collaborative profit allocation model for truckload carriers′ alliance
    LIU Peng1, WU Yao-hua1*, XU Na2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  42-46. 
    Abstract ( 307 )   PDF (456KB) ( 1042 )   Save
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     According to the features of truckload carriers′ alliance, a collaborative profit allocation game was formulated and the characteristic function of the game with its calculation method was defined. Based on analysis of the properties which the game should have, weighting factor that reflected the individual contribution difference and relative profit difference were introduced and the weighted-relative-profit-based collaborative profit allocation model was then proposed in order to overcome the shortcomings of existing  methods. Using the real-life operational data from a certain truckload carriers′ alliance, the proposed model was calculated and compared with the Shapley value and Nucleolus. Computational results and comparisons for the instance showed that the proposed model, which takes into account the interests of both the grand coalition and the individual member, was a fair and rational profit allocation method and the profit allocation derived from the proposed model satisfies all the properties including the effectiveness, basic individual rationality, extended individual rationality, basic stability and extended stability. Thus, the proposed model was able to ensure the stability of the grand coalition and the activity of the individual member.

    Simulation for the light distribution in bio-tissues by the Monte Carlo method
    GAO Di, WEI Shou-shui*, REN Xiao-nan, CUI Jian-qiang, XU Cong-juan
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  47-52. 
    Abstract ( 367 )   PDF (2228KB) ( 2526 )   Save
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     A Monte Carlo method was used to study the light distribution in biotissues with a collimated light beam. The track of photons propagation, the energy intensity distribution with optical parameters, the absorption energy density and internal fluence with depths and radius, the change of radially and angularly resolved diffuse reflectances were analyzed. The propagation of the Gaussian beam and circularly flat beam in biotissues was simulated by using convolution. The results showed that when a collimated light beam propagated in the tissue, the energy was mainly concentrated in the vicinity of the central axis. The photons forward movement was enhanced when the g factor was increased. When the absorption coefficient became larger, the distribution of photons was reduced along the vertical and horizontal axis. The internal fluence changed more smoothly than the absorption energy density. The energy distribution of the Gaussian beam had a larger concentration than that of a circularly flat beam, changed more rapidly and had a larger energy absorption in the center.

    A new delay-dependent global asymptotic stability forneural networks with time-varying delays
    LIU Guo-cai, LIU Yu-chang, JU Pei-jun
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  53-56. 
    Abstract ( 303 )   PDF (313KB) ( 1049 )   Save
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    The asymptotic stability of neural networks with time-varying delays was studied. By the use of the Lyapunov-Krasovskii functional and integralequality approach, sufficient conditions were developed to ensure that the delayed neural network has a unique equilibrium point and global asymptotic stability. Monotone was not required by the activation function, and the delayderivative could be 1 or more than 1. Reduced conservativeness of the proposed method was verified with an example.
     

    Reducing parametric perturbations in a Buck converter by an Hcontroller
    XIAN Yan-hua1,2, FENG Jiu-chao1*
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  57-61. 
    Abstract ( 262 )   PDF (840KB) ( 1231 )   Save
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    To reduce the effect of disturbances, a nonlinear controller was designed for a DC/DC Buck converter. First, an error model with disturbances was built based on the nonlinear model of a Buck converter. Then an H∞controller and its parameters were deduced based on the passive theory. A theoretical analysis was given to prove the stability of a closedloop control system. Finally, a  numerical simulation and circuit simulation were performed for the case of parametric perturbations of a Buck converter. The simulation results demonstrated the validity and effectiveness of the proposed control strategy.

    Function approximation capabilities of cloud reasoning neural networks
    YU Shao-wei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  62-66. 
    Abstract ( 235 )   PDF (339KB) ( 1323 )   Save
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    A controlling model of an adaptive neuro-cloud inference system (ANCIS) was constructed by utilizing cloud theory with the function approximation property of the proved model. The Zadeh fuzzy inference neural nets were developed into cloud inference nets, and a model of ANCIS in Takagi-Sugeno type was established. The attribute functions and the inference rules of the system variables were devised with computational relations between the layers of input and output and a synthesized computational expression of system outputs ascertained. A successful proof of global approximation property of the model was accomplished by testifying that the computational expression of output results of the founded model satisfied the three hypothetic conditions of the Stone-Weirstrass theorem.

    Structure and properties of a collagen scaffold material
    HU Shun-peng1, ZHAO Hong-shi2, WANG Guan-cong2, CAO Cheng-bo1*, LIU Hong2*, LI Wen-bo1, YANG Xiao-yu1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  67-71. 
    Abstract ( 373 )   PDF (1111KB) ( 2033 )   Save
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    Collagen matrix acellular dermal matrix (ADM) has been widely used as scaffold material in skin tissue engineering. However, its pore diameter is small, its porosity is low, and its pore interconnectivity is poor. In light of this, a collagen scaffold  material with suitable pore diameter, high porosity and obvious interconnected pore structure was prepared by means of the combined treatments of  enzyme, alkali, sodium dodecyl sulfonate and sodium chloride solution, and its structure and properties were analyzed. UV and FTIR spectra showed the typical collagen peaks, and the content of collagen was (83.19±0.24) %. Scanning electron microscopy (SEM) images displayed  that the scaffold material had threedimensional interconnected channels with a diameter of about 100μm. The porosity of the scaffold material was (76.94±1.08)%, the ultimate tensile strength was (4.43±0.10) MPa, and the elastic modulus was (36.08±1.52) MPa. Mouse fibroblasts L929 were cultured on the scaffold material, and cell proliferation tests were performed by MTT assay. Results from the MTT assay indicated that the cells cultured on the scaffold material could proliferate well.

    Preparation and properties of TiO2/ZnO Photocatalyst
    XU Qing, LV Wei*
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  72-74. 
    Abstract ( 240 )   PDF (827KB) ( 1103 )   Save
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    Highly ordered TiO2/ZnO nanocomposites with core-shell structure were successfully fabricated by a two-step method(anodic oxidation and hydrothermal method). The nanocomposites were analyzed by means of a scanning electron microscope (SEM), double beam UV-vis spectrophotometer and transmission electron microscope (TEM). The photocatalytic activity of the prepared material was tested by taking methyl orange as a pollutant on the model and natural light as the light source. The results showed that, TiO2/ZnO composite photocatalyst could improve the utilization of sunlight, and  could show the best  catalytic activity under the condition of pH=3 solution and degraded under the sun for 5 hours,  which reached to 90%.

    Preparation of CeO2 nanocrystals by solvothermal routes
    YU Li-li1, LIU Bao1*, QIAN Li-wu2, QIAN Xue-feng2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  75-79. 
    Abstract ( 245 )   PDF (1321KB) ( 1461 )   Save
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     CeO2 nanocrystals were successfully synthesized via a simple alcohol-water solvothermal method using PVP as a capping agent and Ce(NO3)3·6H2O as a precursor. The shape and size of the products could be effectively tuned by controlling the reaction conditions, such as reaction time and the molar ratio of Ce3+to PVP. Xray diffraction analysis showed that the phase of the particles was CeO2 of cubic system, and their structures and size were characterized by SEM and TEM. The results of photoluminescence (PL) spectra showed that the fluorescence peak corresponds to different luminescence centers, and the fluorescence of Eu3+∶CeO2 nanomaterials have excellent photoluminescence.

    Computer controlling and performance testing of  a fluidized pre-oxidation furnace for carbon fiber manufacture
    GAO Xue-ping, ZHU Bo, YU Kuan
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  80-83. 
    Abstract ( 309 )   PDF (887KB) ( 1083 )   Save
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    To meet the requirements of high precision of temperature control, high heating rate, accurate measurement of gas flow rate and drafting rate of the carbon fiber, a distributed computer control system was designed for a new type fluidized preoxidation furnace test line. According to the requirement of the carbon fiber production process, the performance of the furnace was tested. The results showed that all the performances, such as temperature control, gas flow rate, and heating rate could meet the requirements.

    Experiments and calculation method for bearing capacity of the lining segment of metro shield tunneling
    ZHOU Hai-ying1, LI Li-xin2, CHEN Ting-guo1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  84-87. 
    Abstract ( 601 )   PDF (842KB) ( 1676 )   Save
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     A test of three reinforced concrete (RC) lining segments of fullscale was carried out. The effect of the loading method and reinforcement ratio on the failure mechanism and ultimate bearing capacity of the RC lining segments was analyzed based on the test results. Test results indicated that the cracking load, the yielding load and the ultimate load obviously increases because of the  axial force effect. The yielding load and the ultimate load slightly increase with an increase of the reinforcement ratio, but the cracking load was hardly affected by the reinforcement ratio. Based on the analysis of the failure mode of lining segment, formulas for the bearing capacity of the lining segment to eccentric compression are proposed.

    The  confirming method of the urban  flood warning level of Jinan City
    WANG Yu-kui, XU Bang-shu, LI Shu-cai
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  88-91. 
    Abstract ( 322 )   PDF (510KB) ( 1199 )   Save
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     Combined with the existing method in determining the level of urban flood warning, a model was proposed. This model used the multiple linear regression method. It considered the interaction of many impact factors in determining the level of urban flood warning. It has a high correlation among the impact factors. It used the typical rainfall data of Jinan City to test the accuracy of the model. The result showed that this model has a good effect. This model can be used in the urban area of Jinan City to determine the level of flood warning.

    Experiments on dispersive soil identification and modification
    LI Hua-luan1, GAO Pei-fa2, MU Nai-min3, WANG Lin2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  92-95. 
    Abstract ( 494 )   PDF (646KB) ( 1209 )   Save
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     The soil  of the Datun   Reservoir, Lingluo Reservoir and Guanlu Reservoir is typical dispersive soil. The dispersive grade needs to be determined for engineering safety. The double densimeter test, pinhole test and crumb test were developed on the dispersive soil. The dispersive grade was determined by the test results. The soil modification test by lime was developed and the filtration examination was done after modification. The results showed that the improvement effect  was the best with about 1.5% lime content. The filtration examination results showed that the engineer demand could be satisfied with the modified soil by lime, which could provide theoretical reference and technical support.

    Theory analysis and application on temperature load effects of large span CFST arch ribs under construction
    SUN Guo-fu1,2, LI Shu-cai2, ZHANG Bo2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  96-101. 
    Abstract ( 255 )   PDF (1963KB) ( 1160 )   Save
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    To research the law of temperature load effects during the installation of the steel tubular arch ribs of the Zhijing Bridge, a computational analysis and comparative study was done for a variety of working conditions of temperature changes and the measured temperature in site using a space finite element model established by ANSYS parametric design language. This method integrates the perspectives of bukle′s temperature and arch ribs′ nonlinear temperature, and establishes the finite element model according to the principle of equivalent linearization of the nonlinear temperature. The results showed that the nonlinear temperature under sunlight affects the accuracy of the main arch ribs installation, and reveals the changes law  of arch ribs under the sunlight affect, which could provide a reference for the installation of CFST arch ribs.

    Hydrodynamic pressure effects analysis of large bridge grouppiles foundation under  earthquakes
    LI Fu-rong1,2, HE Shan1, WANG Zhi-hua2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  102-107. 
    Abstract ( 267 )   PDF (2531KB) ( 1461 )   Save
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    Taking the large group piles foundation of the Changjiang River Road Bridge as a research project, and computing on  ABAQUS finite element software, and using the added water mass method to consider the effects of hydrodynamic pressure, the seismic response of the bridge group-piles was calculated numerically by the whole finiteelement method, three earthquake waves with different spectra was selected,  dynamic nonlinear characteristics of soils and concrete was considered, and the hydrodynamic pressure effect of the large group piles foundation for bridge on deep overburden layers was analyzed. The results showed that hydrodynamic pressure effect changed the seismic responses characters of the group piles foundation, which had the impact on the acceleration, displacement and inner force of the pile. It  complies much more with the actual situation considering the hydrodynamic pressure effect in the seismic design of a large bridge foundation.

    Synthesis and properties of amphoteric fluorescent whitening agents
    YANG Xiao-yu, CAO Cheng-bo*, ZHOU Chen, HU Shun-peng
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  108-112. 
    Abstract ( 231 )   PDF (881KB) ( 1135 )   Save
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    Considering the weak acid resistivity and solubility of the anionic FWA in acidic conditions, the triazinyl aminostilbene fluorescent whitening agents were synthesized through three-step condensation reactions using 4-aminobenzoic acid with cyanuric chloride (CC), 4,4′-diamino stilbene2,2′-disulfonic acid (DSD acid) and aliphatic amines as the basic materials. Triethanolamine, triethylamine, N, N-dimethyl ethanolamine and Nmethyldiethanolamine were used to synthesize four new types of amphoteric fluorescent by  the third step condensation reaction. The structural characterization of the synthesized amphoteric fluorescent whitening agents (FWA) was given. The fluorescence emission properties and the dyeing properties of the amphoteric FWA were studied by comparing with those of anionic FWA. The results showed that the fluorescence emission efficiency was lower than that of anionic FWA, and  the amphoteric FWA was more suitable for dyeing in acidic conditions.

    Reaction kinetics of [BPy]Br and [BMIm]Br under microwave-assisted synthesis
    XU Ming
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  113-116. 
    Abstract ( 256 )   PDF (905KB) ( 1190 )   Save
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    N-methyl imidazole bromide ([Bpy]Br) and 1-methyl-3-butyl imidazole bromide ([BMIm]Br) were synthesized by the respective reactions of pyridine and Nmethyl imidazole under microwave radiation in a microwave reactor. Reaction kinetics was determined by AgNO3 titration to obtain the reaction kinetics equation, and the influences of reactants, temperature, and solvent were also investigated. The mechanism of microwaveassisted reactions was proposed. Results showed that the reaction abides by SN2 mechanism, and the global reaction was of the second order. The reaction rate constant was enlarged by 10 times compared to traditional heating methods, and increased with rising temperaturing. The rate constant for synthesis of [BPy]Br in isopropanol was about 5 times larger than in nheptane. The activation energy was 30.39kJ/mol for synthesis of [BMIm]Br, and 92.17~97.27kJ/mol for synthesis of [BPy]Br. Microwave radiation could take effect by increasing reaction frequency factors instead of changing the reaction mechanism and activation energy.

    Three-way catalyst for a natural-gas engine
    ZHANG Qiang1, LI Na1, 2, LI Guo-xiang1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  121-124. 
    Abstract ( 340 )   PDF (1196KB) ( 1370 )   Save
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    The special three-way catalyst for a natural-gas engine was studied by using noble metal Pd and a small amout of Pt as the activated composition. The light-off temperature, conversion efficiency and durability were studied by using different coating materials and activated assistants on the testing small sample catalyst evaluation system. The experimental results showed that Al2O3/SiO2 could be adopted as a coating material of the threeway catalyst for Si-Al-O had better resistance to sulfur poisoning and maximal conversion efficiency. The Co-Ce-Mn-O catalyst assistant could be used as an activated assistant for the best property data of the lightoff temperature and conversion efficiency.

    Match of the power train of a single-axle parallel hybrid electric bus
    NIU Li-min, ZHAO You-qun, YANG Pan, LI Jia
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  125-128. 
    Abstract ( 308 )   PDF (1377KB) ( 1474 )   Save
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    Aimed at improving vehicle power performance and fuel economical performance, key parts of a single-axle parallel hybrid electric bus (HEB) power train were designed and matched according to design requirements of HEB. A singleaxle parallel HEB model was built up in electric vehicle dynamics simulation soft ADVISOR, simulated and compared with a conventional bus. Simulation results showed that the HEB power train parameters design met the development requirements, and provided references for future development.

    Performance of the high pressure stage compressor of a two-stage turbocharging system
    HE Yi-tuan
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  129-132. 
    Abstract ( 271 )   PDF (779KB) ( 1408 )   Save
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    To make the high pressure(HP) stage compressor and the low pressure(LP) match with optimization and improve the efficiency of the whole two-stage turbo-charging system, the performance of a HP stage compressor was studied on a two-stage turbo-charging system test bench. In the turbo-charging system, the fresh air was first precompressed through the LP stage compressor to get the HP stage compressor′s inlet condition with high pressure & high temperature. An intercooler was set between the HP and LP stage compressors. To each test curve had the same rotation speed, and the inlet temperature of the HP stage compressor was kept unchanged. The test results showed that there was much difference between the corrected speed and actual speed of the HP stage compressor only because the increase of its inlet temperature. In order to get the preconcerted pressure ratio, the speed of the HP stage compressor should be much improved. The corrected air mass flow of HP stage compressor was much less than its measured air mass flow, which was mainly because the great increase of inlet pressure of the HP stage compressor. In order to avoid a surge of the HP stage compressor, its inlet pressure should be controlled.

    Design of the system of high-accuracy resistors′ automatic data acquisition and dynamic display
    WANG Ze-jing1,2, QIN Jing-yu1*, MI Chun-xu1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  133-137. 
    Abstract ( 289 )   PDF (750KB) ( 1439 )   Save
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    In order to accurately measure the electrical resistance of the order of 10-8 Ω or monitor the structural change of conductive materials, a highaccuracy data acquisition system with dynamic displaying was designed. The  Keithley 2182 nanovoltmeter was used to measure voltage and temperature together with the Type K thermocouple. The PF66M digital multimeter combined with the Advantech PCI I/O card and the terminal block was employed to supply constant direct current to the samples. The software for the automatic data acquisition and dynamic display was developed based on Delphi. Tests on such a system were made by monitoring the heat treatment process of casting aluminum 101A alloy, which indicated that the system was reliable, accurate and has high efficiency.
     

    Numerical model analysis of backwater of a drainage system upon instantaneous startup of a circulating pump
    GAO Kun-hua, ZHANG Cheng-yi, HU Yi-gong, XU Shi-qian, ZHENG Guan-jun, WANG Wei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  138-143. 
    Abstract ( 305 )   PDF (1183KB) ( 1610 )   Save
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    Combined with the problems that backwater of drainage system upon instantaneous startup of a circulating pump seriously existed in commissioning and operation of Shandong Huaneng′s Rizhao Power Plant Phase II Project (2×680MW), the backwater drainage system of DC circulating water was analyzed by using a mathematical model calculation. Then the calculation design elevation of the well top of the drainage well and siphon well were obtained, and some improvement measures on reducing backwater were proposed, which could provide experiences for reducing backwater on future designing of a DC circulating water system.

    Self-adaptive multisensor image fusion algorithm based on dual-tree complex wavelet-Contourlet transform
    ZHAO Wen-zhong
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  144-148. 
    Abstract ( 242 )   PDF (1852KB) ( 1102 )   Save
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    To overcome the poor directional selectivity of wavelet transform, a new self-adaptive multi-sensor image fusion algorithm was proposed based on the dual-tree complex wavelet-Contourlet transform.Using this algorithm,the panchromatic and multispectral images were first decomposed and transformed,and then different fusion rules were used according to different frequency characteristics: the self-adaptive regional energy coefficients added fusion rule were used for the lowfrequency and the regional feature self-adaptive fusion rule for the high-coefficients.The final fusion images was obtained by reconstruction.Compared with other fusion algorithms, the results showed that the self-adaptive image fusion algorithm based on the dual-tree complex wavelet-contourlet transform was feasible and effective.

    The design of activation energy measurement equipment and measurement  of activation energy of  microcrystalline silicon thin films
    CHEN Qing-dong1, WANG Jun-ping1, ZHANG Yu-xiang2, LU Jing-xiao2
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  149-152. 
    Abstract ( 219 )   PDF (1274KB) ( 1881 )   Save
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    Activation energy measurement equipment were designed to analysis the intrinsic property of microcrystalline silicon film. The equipment included the measurement platform, the vacuum system and heating control system of equipment. The computation method of activation energy was also put forward. The effect of different voltages and different dot numbers on the activation energy measuring were analyzed. The result showed that both different voltage and different dot numbers have little effect on the activation energy result.

    Mintegration: a solution to large volume concurrent data integration
    CHEN Sheng-li 1, LI Jun-kui2, LIU Xiao-dong1
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2010, 40(4):  153-158. 
    Abstract ( 252 )   PDF (1118KB) ( 1187 )   Save
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    In the light of the conflict between limited memory and large-scale data, a solution to large volume concurrent data integration was proposed, which was not read the data into memory at one time, but divided the task into several sub-tasks according to the large volume data. The sub-tasks was complicated by the implementation so as to solve the limited memory and largescale conflict between the amount of data. The theoretical analysis and empirical experiments showed that resources could be used in the method of the system, and the solution could be efficiently applied in the large volume data integration process with a configurable mode.