Loading...

Table of Content

      
    16 October 2009
    Volume 39 Issue 5
    Articles
    Relaxation in glasses far from equilibrium
    YUE Yuan-Zheng
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  1-20. 
    Abstract ( 326 )   PDF (1419KB) ( 961 )   Save
    Related Articles | Metrics

    This paper describes recent advances in the study of relaxation in hyperquenched glasses (HQGs), i.e., glasses far from equilibrium. The new approaches for determination of the fictive temperature and the cooling rate of the HQGsare introduced and two examples are presented. The hyperquenching-annealing-calorimetric scan (HAC) strategy is used to explore the energetic and structural heterogeneities in glasses. The occurrence of a pre-endotherm is observed when a properly annealed HQG undergoes a calorimetric upscan. The pre-endotherm is followed by an exotherm due to the release of the excess energy stored during hyperquenching, and subsequently by the endothermic glass transition. Several striking features of the pre-endotherm are demonstrated and compared with those of the glass transition. This comparison is crucial for understanding the non-linearity and nonexponentiality of the relaxation in glass. The data obtained from the HACexperiments on silicate glasses are used to clarify the glass transition of water. Fundamental differences in relaxation behavior between a strong and a fragile HQG are found and analyzed in terms of their structural and energetic origins.The strong impact of the annealing degree on the vibrational density of states of HQGs are exhibited and discussed in terms of microstructure.

     

    Adaptive spectral clustering algorithm
    BO De-Yun, ZHANG Dao-Jiang
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  22-26. 
    Abstract ( 452 )   PDF (1011KB) ( 3414 )   Save
    Related Articles | Metrics

    Spectral clustering has been used to identify clusters that are non-linearly separable in input space, and usually outperforms traditional clustering algorithms. However, the performances of spectral clustering are severely dependent on values of the scaling parameter. In this paper, an adaptive spectral clustering (ASC) algorithm was proposed based on traditional spectral clustering, which can choose the scaling parameter automatically by using techniques similar to kernel selection. The new algorithm was compared to existing parameter selection based spectral clustering algorithms on both synthetic and UCI data sets, and the experimental results validate the effectiveness of the proposed algorithm.

    A fingerprint engine for author profiling
    DONG Ai-Feng, DIAO Ge-Ji, SCHOMMER Christoph
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  27-31. 
    Abstract ( 434 )   PDF (756KB) ( 774 )   Save
    Related Articles | Metrics

    With the development of the internet, digital texts are proliferating. Protection of a copyright has become increasingly important in recent years. To solve the copyright problem, one way is to profile an author's writing style. By comparing writing styles, we could tell whether a text has been written by a certain author. Most of the current researches in author profiling focused on examining linguistic attributes or finding new attributes. However, the appropriate profiling of an author is still a challenging task. This paper aims to build a model to fingerprint an author, and took texts of an author of a certain domain as input and produced a profile of the author as output. Using this fingerprint engine we can tell with a certain probability whether an input text has been written by an author among a list of possible authors. This paper focused on author profiling of English texts. Writing styles were measured using linguistic attributes and linguistic measurements. Statistical methods, such as standard deviation analysis and principal components analysis, were used to evaluate the linguistic measurement's efficiency.

    Algorithms of continuous top-k join query over structured overlay networks
    ZHAO Ke-Jun, WANG Xin-Jun, LIU Xiang, CHOU Yi-Hong
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  32-37. 
    Abstract ( 332 )   PDF (532KB) ( 1154 )   Save
    Related Articles | Metrics

    It is challenging to process continuous queries over structured overlay networks due to the distribution characteristic of the environment.An algorithm based on  top-k join queries over structured overlay networks is presented. In the proposed algorithms, the data that can not contribute the finale top

    -k results was discarded based on the  pre-computing results of ranked functions The performance of the algorithms was analyzed. Our algorithms reduced  the network traffic  while more nodes participate in the query process.

    A medical ultrasound image filtering method based on the anisotropic diffusion equation
    LIU Fen, SUN Feng-Rong, GENG Dun-Qing, QIN Xiao-Gong, YAO Gui-Hua, ZHANG Yun
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  38-42. 
    Abstract ( 402 )   PDF (601KB) ( 2574 )   Save
    Related Articles | Metrics

    Speckle noise is one of the inherent noise patterns evoked by the mechanism of ultrasound imaging, which  brings great difficulties to feature extraction, recognition and analysis. Techniques based on the anisotropic diffusion equation can effectively suppress the speckle noise. An algorithm using the anisotropic diffusion equation was proposed to suppress the speckle noise of a medical ultrasound image. This method improves LinShi operator and enhances the conventional method by setting the threshold value and including diagonal edges. The simulation results showed that this  method is superior to the classical PM equation and LinShi operator at image smoothing and edge preserving, and denoising for real ultrasound image indicates that  this  method has high potential for clinical applications.

    Human motion detection based on multi-feature fusion
    TIAN Guo-Hui, JI Yan-Jing, HUANG Bin
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  43-47. 
    Abstract ( 385 )   PDF (792KB) ( 4153 )   Save
    Related Articles | Metrics

    A novel method was proposed to detect human daily activities and  fall behavior based on features fusion. Actions were described by a set of postures and features of postures change velocity and position changes, then simple postures events and features were combined to express complex human activities events.This method can robustly detect human actions, thus can be used for intelligence interactive and service robot autonomous server system.

    New stability criterion for a class of uncertain neutral systems with time-varying delay
    KONG Xian-Meng, JU Pei-Jun
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  48-51. 
    Abstract ( 348 )   PDF (215KB) ( 1753 )   Save
    Related Articles | Metrics

    The stability of uncertain neural systems with time-varying delay was discussed. Making use of the theory of the Lyapunov-Krasovskii functional method,   relaxation metrics and Moon inequality, the sufficient condition for stability was obtained, of which  the system neural matrix was allowed to be  uncertain and less conservative than the existing results. An example was proposed to illustrate the effectiveness of the obtained results.

    The impact of global warming on the design standard ofbuilding envelops
    ZHANG Xun-Hua, GAO Qing
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  52-57. 
    Abstract ( 383 )   PDF (862KB) ( 2137 )   Save
    Related Articles | Metrics

    By analyzing the model presented by J. E. Braun, the PSO algorithm and Matlab simulation tool were used to identify the parameters both in 2008 and 2100 under the condition of invariable cooling load. The model parameters are related to real physical ones, so it is possible to give out adjustment references of thermal parameters to stop the increasing energy consumption causing global warming.

    Self-adaptive threshold method of MR image denoisingbased on stationary wavelet transformation
    LIU Cheng-Yun, CHEN Zhen-Hua, CHANG Fa-Liang
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  58-61. 
    Abstract ( 387 )   PDF (644KB) ( 2315 )   Save
    Related Articles | Metrics

    To overcome the defect of image denoising based on Donoho’s threshold of wavelet domain, a self-adaptive method for image denoising based on stationary wavelet transformation was proposed. According to different subband characteristics, a new scale parameter equation was defined todetermine the optimal thresholds adapting to each step scale, and the thresholds of the detail signals of each level generated by stationary wavelet transformation were obtained.The method not only well depresses the Gibbs impact well, but also supplies a gap of orthogonal wavelet transformation so as to retain the MR image details when wiping offnoise. Experimental results indicate that the proposed method is more effective than discrete orthogonal wavelet transformation with respect to performance and visual effect.

    High voltage cable temperature measurement system based on neural network controller
    ZHANG Ying-Chun, WANG Zuo-Xun, WANG Gui-Juan
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  62-67. 
    Abstract ( 365 )   PDF (706KB) ( 1669 )   Save
    Related Articles | Metrics

    At present the methods for measuring high voltage cable temperature can only measure current temperature, lag behind control and not identify  it in advance. After research on the traditional methods to measuring cable temperature, a new method using neural network controller to measuring high voltage cable temperature was proposed. On the basis of three conventional controllers, three kinds of controllers using a neural network were designed. They are the neural self-adjustment controller, the neural PID controller and the neural adaptive controller. All themethods were simulated by MATLAB. According to  the simulation results, the neural PID controller was proved to be  the best controller to apply to high voltage cable measuring temperature system, which was  verified by the power supply system in Xinjiang with  good results.

     

    Foreign fiber recognition and detection algorithm based on RGB color space
    FENG Xian-Ying, ZHANG Cheng-Liang, YANG Bing-Sheng, LI Lei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  68-72. 
    Abstract ( 383 )   PDF (460KB) ( 1587 )   Save
    Related Articles | Metrics

    The cotton fiber distributing model in RGB color space was studied in the article and an accurate physical model arithmetica color image clustering   algorithm was proposed. A real- time detecting algorithm was developed on this basis. In order to enhance the algorithm efficiency, the improved real-time detecting algorithm was presented to extract the target from backgrounds in the foreign fibers inspecting system. Due to the complexity and diversity of recognizing a foreign fiber, it is hard to meet the requirements using one or two characters. A multiple targets recognition method based on combined characters such as color, area and shape was presented, which can highly increase the quality of targets recognition.

    A life cycle assessment indicators system and quantification methods of electromechanical products
    WANG Xiao-Wei, LI Jian-Feng, LI Fang-Yi, WANG Li-Ming
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  73-78. 
    Abstract ( 443 )   PDF (397KB) ( 1648 )   Save
    Related Articles | Metrics

    The system boundaries and scopes were defined after presenting the life cycle process model of electromechanical products, and the key assessment issues were analyzed. Then, the environment-impact indicators system of electromechanical products was found considering the design factors, including technique attributes,economic attributes and environmental attributes. The quantification methods of assessment factors were discussed in detail.Finally,  the rationality of indicators system and the feasibility of quantification methods were proved by its application on a pint-sized electromotor.

    The electronic-pneumatic hill-starting assist control forheavy-duty vehicles with AMT
    WANG Hong-Liang, ZHAO Xi-Jun, LIU Hai-Ou
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  79-83. 
    Abstract ( 338 )   PDF (755KB) ( 1940 )   Save
    Related Articles | Metrics

    Based on the NorthBenz 2627 heavy-duty self-discharging car, the hil start assist control system was designed. The system reconstructed the parking break system on the characteristics of the parking break system, so the parking break system could be controlled automatically. The mechanical change of the vehicle which started on a hill was analyzed. The hill-start control strategy and software were designed based on the mechanical change of the vehicle and the characteristics of the clutch working process. The accelerative pedal and the clutch were controlled with the parking system as a whole. The control strategy's effectiveness to solve the problems that the engine stopped burning and that the car drove back down the hill for the reasons of  the improper control between the hill-start courses was validated through the actual test.

    Static working principle of robot whisker sensors
    GU An, FANG Zhi-Jun
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  84-86. 
    Abstract ( 415 )   PDF (588KB) ( 1164 )   Save
    Related Articles | Metrics

    For the reason that whisker sensors can only measure the displacement of whisker root alone, the mechanical model of the flexible whisker was stablished. The bendingsituation of the whisker was characterized by the magnitude of deflection angle,and an relation equation between deflection ngle and the contact position was deduced. The displacement of the whisker root was measured with the whisker sensors,and an experimental curve of the contact position was obtained. Comparison of the experimental curve with a theoretical curve indicated that the contact position between the robot isker and the measured object can be measured with the whisker sensors. The experimental data showed that the magnitude of deflection anglewas inversely proportional to the contact distance, and the smaller distance was more rapid magnitude as the deflection angle increases, based on which the localization information of a target object was obtained.

    Critical load of rock salt roadbed with a spherical cavity
    ZHANG Dui-Fu, NIU Hai-Yan
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  87-90. 
    Abstract ( 381 )   PDF (292KB) ( 1278 )   Save
    Related Articles | Metrics

    The stress concentration of a spherical cavity in an infinite cube was studied by the three-dimensional elementfree Galerkin method. The maximal tensile stress criterion, Griffith criterion and Moore-coulomb criterion was respectively taken as the stability criterion. The stability of a rock salt roadbed with a spherical cavity was numerically simulated. The critical load of a rock salt roadbed with different cavity depth was given.

    Geological work method for the construction of the Yichang Wanzhou Railway tunnel in high risk karst areas
    DIAO Yong, TIAN Si-Meng, CAO Zhe-Meng
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  91-95. 
    Abstract ( 342 )   PDF (310KB) ( 1717 )   Save
    Related Articles | Metrics

    The method of geological work for the construction of karst tunnels, and the procedures and contents were put forth. Then, the tunnel management was carried out based on the classification of A, B and C in view of the complexity of karst tunnels concerning the geological and hydro-geological condition, the effect of geological factors on tunnels and the induced environmental problems. Correspondingly, there were three classes for advance geological forecasting with various methods and means. Finally, the disaster evaluation was taken on the basis of geological forecasting. Suggestions on disaster warning and construction countermeasures were put forth for the reference of optimization of design and construction in karst tunnels. This method was successfully applied in on Yi Wan Railway.

    Theoretical and applied case of seismic imaging in tunnel
    TUN Shi-Lin, XIAO Shu-An
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  96-100. 
    Abstract ( 364 )   PDF (2101KB) ( 1301 )   Save
    Related Articles | Metrics

    Seismic measurements during tunnel operations aim at images of maximum spatial resolution. However, there are still principal limitations of the method applied in tunnels with regard to the spatial resolution by the signal frequency and attenuation,  the signal frequency and attenuation, and the smallan gular illumination coverage. A finitedifference simulation of elastic wave propagation was performed to compute a synthetic tunnel seismic reflection   survey. Synthetic data were used for optimizing the best practice tunnel data processing sequence for both P and S  waves, especially for the use of attenuation models to compensate amplitude loss as well as dispersion by an inverse Qfiltering, and for the use of a spatially variable velocity model to yield the right image positionof a reflecting geological element in space. The transfer and capability of this practice to real tunnel application was finally demonstrated by the case study of the tunnel seismic prediction method in the Koralm tunnel project in Austria.

    Judging criterion of structures with closely spaced natural frequencies and its effect on control results
    XIE Fa-Xiang, SUN Li-Min
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  101-105. 
    Abstract ( 347 )   PDF (638KB) ( 1361 )   Save
    Related Articles | Metrics

    Structures with closely spaced natural frequencies exist widely, while the judging criterion of the density of closely spaced frequencies is in dispute. A judging criterion for structures with closely spaced natural frequencies based on the analysis on a controlled two degree of freedom structure was suggested. [JP2]The perturbation method was applied in the analysis and the results were verified by numerical simulations. It was shown that the optimal control gain of the two degree of freedom structure with velocity feedback was dependent on the frequency density of the structure, which was  quantatively equal to the maximum additional mode damping ratio of the structural mode with higher frequency. When usingstate feedback, the maximum attainable additional mode damping ratio is 3 times the frequency density parameter. The results indicated that the frequencies density parameter was closely related to the optimal modal damping ratio of the structure. Based on a brief review of previous research, a judging criterion related the minimum frequency density parameter and the required modedamping ratio were proposed, which has a clear physical meaning.

    Distributed generation—new technology in energy development
    GAO Hou-Lei, TIAN Jia, DU Jiang, WU Zhi-Gang, LIU Chu-Min
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  106-110. 
    Abstract ( 448 )   PDF (337KB) ( 1650 )   Save
    Related Articles | Metrics

    Due to the shortcoming of conventional energy and increasingly serious environmental problems, there is growing emphasis on development and use of enewable energy. Nevertheless a related technology called distributed generation(DG) has had a great development. The background, concept and classification of DG were introduced, and then the technology features and developing status were described in detail for different types of DG such as wind energy,solar energy and biomass. Parallel approaches and related technical problems for distributed generators to be connected to power systems were also discussed. The prospective application of DG was analyzed according to the development strategy of renewable energy in China.

    Micro dynamic simulation system
    MA Lin-Lin, BO Zhen-Cun, GAO Hou-Lei, CONG Wei, GAO Chen-Jun
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  111-114. 
    Abstract ( 427 )   PDF (287KB) ( 2242 )   Save
    Related Articles | Metrics

    The dynamic simulation system is a very important method to analyze the electricity power system situation and to test the protective relaying together with a second device. The micro dynamic simulation system was put forth to simulate a power system. The synchronous generator was imitated by a signal enerator which has the similar transfer function or dynamic response with it. The transmission line was modeled by a ∏-shape circuit consisting of low power impedances and capacitances. An intelligent data interface conversion unit will seamlessly connect the output of the system with the second relay devices. Compared withthe present dynamic simulation system, the microsystem has advantages of little investment, little power consumption, low performance expense and convenient operation.

    A new detecting method for the voltage sag source in a distribution system
    GAO Hong-Xia, XU Meng-Ming, LI Ge-Jun, TAN Shen-Yu
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  115-119. 
    Abstract ( 327 )   PDF (301KB) ( 1108 )   Save
    Related Articles | Metrics

    Calculating the increments of the voltage and current caused by disturbance can get the defined impedance. The sign of the real part of the defined impedance can reveal if the disturbance is from upstream or downstream. A positive sign showed that the source of sag was upstream, and the negativesign showed that the source of sag was downstream. A new and effective detecting method for the voltage sag source was proposed based on the defined impedance. In order to solve the problem that using a single during an event cycle could yieldunreliable results,the data of multiple cycles were processed by using the least squares method. Simulation results showed that this method was effective.

    Analysis and calculation of the braking force for a side magnetism brake single phase induction motor
    SUN Yuan-Yuan, XU Yan-Liang, TAO Zhi-Ning
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  120-123. 
    Abstract ( 400 )   PDF (962KB) ( 1519 )   Save
    Related Articles | Metrics

    A sidemagnetism brake singlephase inductionmotor (SBSIM) for the application in electric tools was made, where a poweroff brake is needed. The axial magnetic braking force was theoretically analyzed and calculated, which was first verified by the 3D finite element method(3D FEM). Then the flux densty distribution in different airgap positions with and with out load  were analyzed, and the related parameters used in the theoretical expressions of braking force were given.

    The investigation of polyethylene surface modification by cold plasma induced grafting polymerization of acrylonitrile
    LIU Yan-Pu, Shi-Lai-Shun, Ba-Huan-Fen, Guo-Fang
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  124-127. 
    Abstract ( 380 )   PDF (405KB) ( 1745 )   Save
    Related Articles | Metrics

    The surface modification of the polymer was studied by the plasmainduced polymerization method. The influence of the grafting reaction condition to the grafting ratio was investigated by using polyethylene as a polymer substrate and the acrylonitrile as a grafting monomer. The higher the reaction perature, the higher the grafting ratio. The grafting ratio sharply  increased when the reaction temperature reached the boiling temperature of the reaction solution.  The grafting ratio proportionedly increased with the monomer concentration. The grafting ratio increased along with the prolonging of the reaction time. The solvent had great influence on the grafting reaction. The grafting ratio increased with the increasing of volume ratioR(R=V(H2O) / V(CnH2n+1OH))when using methanol and water as mixed solvent. When R was zero, which means using only ethanol or isopropanol as the solvent, the grafting ratio had the maximum values for polyethylene grafting with acrylonitrile. The grafting ratio decreased when the solvent contained water. It was confirmed by ATRFTIR analysis that acrylonitrile was grafted onto the polymer surface.

    Synthesis and properties of associating DRA by binary copolymerization based on lauryl methacrylate
    LONG Zhi-Jian, ZHANG Chang-Qiao
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  128-132. 
    Abstract ( 376 )   PDF (929KB) ( 1751 )   Save
    Related Articles | Metrics

    The linear chain copolymerized alkenes polymer is widely used as a drag reducing agent (DRA) in oil pipeline transportation. However, the molecular weight of the drag reducing agent decreased sharply because of chain fracture, and the decreased effectiveness of drag reducing, known as shear degradation. A new kind of antishearing drag reducing agent was synthesized. The synthesis method, effect of initiator on the monomer onversion, drag reducing rate of associating DRA and antishearing performance were examined. The result showedthat the synthesis process had the advantages of simple operation and mild reaction conditions. The synthesized DRA showed better antishearing performance thanlinear chain copolymerized alkenes DRA. The drag reducing efficiency increased with adding the synthesized DRA and the increasing trend became slower. With concentration increasing, drag reducing efficiency curve of the sheared additives became similar to the unsheared one.

    Screening of a denitrifying bacterium strain LZ-14 and its nitrogen removal characteristics
    CHEN Peng, HU Wen-Rong, FEI Hai-Yan
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  133-138. 
    Abstract ( 363 )   PDF (543KB) ( 1897 )   Save
    Related Articles | Metrics

    22 nitrate reducing strains were isolated using dilute soil suspension spread plate techniques from soil that sampled from the rhizosphere of Arundo donax L.. Denitrifying bacterium strain LZ-14 with faster gas producing and higher nitrogen removal efficiency was screened. The cells of strain LZ-14 were Gram negative, facultative anaerobic, mobile and short rodshaped. The effects of the C/N ratio and pH on the growth and denitrification process of strain LZ-14 were  respectively investigated with acetate and nitrate as the sole carbon and nitrogen source. The results showed that the optimal C/N ratio was 5 and TN removal rate of 845% was achieved in 36 hours with complete removal of 150?mg/L nitrateN. The best initial pH range for strain LZ-14 was 7 to 8, also nearlyno cell growth and denitrification could be detected. It was also found that thenitrogen removal process mainly appened in the growth phase of 12~36 hours with a considerable amount of nitrite accumulation which can be completely reduced in the later 24 hours.

    A sound-image synchronization sign controller based on a CF card
    TIAN Lan, HOU Zheng-Shen, LIU Qiang-Min
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  139-143. 
    Abstract ( 401 )   PDF (356KB) ( 1695 )   Save
    Related Articles | Metrics

    A sign controller was designed and implemented based on a C8051F020 andCF card, which had a soundimage synchronization function for scrolling signs at low cost. The system design scheme and several relative key points were introduced. The hardware interface circuit between the C8051F020 and CF card was given, and the hidden sector problems of FAT file system caused by formatting differentcapacity CF cards was solved. By the combination of the fast reading CF card data, dualbuffer and FSM (Finite State Machine), continuous sound playing is steady realized. The running results showed that the system design is reliable and practical.

    Research of 1/3 dam breach simulation and personnel evacuation scenario based on digital elevation model DEM in a quake lake
    SHI Wen-Hua, LIU Wei-Dong, SUN Yong-Fu
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  144-148. 
    Abstract ( 318 )   PDF (424KB) ( 1528 )   Save
    Related Articles | Metrics

    The model of flow flood velocity, the region submerged by flood water and the flood arrived time at the submerged region when 1/3 dam breach happened in a quake lake were erected. According to this model, the DEM and MATLAB wereutilized to simulate the submerged region and establish the personnel evacuation scenario of the people downstream of the Tangjiashan quake lake of the Wenchuan earthquake. A quantized method in urgency of personnel evacuation was put forth, which could provide data sustainment to the army and related authorities. Finally, the deficiencies such as data shortage and effectiveness wicked in short time emergency risk quake lake assessment were pointed out by the accuracy evaluation.

    Formulation design of metalbearing composite explosive based on genetic algorithm
    DU Gan-Wei, HE Ban, WANG Yu-Ling, LIU Zhi
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  149-152. 
    Abstract ( 387 )   PDF (274KB) ( 2314 )   Save
    Related Articles | Metrics

    The basic thoughts of formulation design for a composite explosive were discussed. Considering all the possible reaction products, a chemical reaction equation was established and a mathematical model of formulation design was obtained. The genetic algorithm(GA) was utilized to solve the example model, and the calculation results showed that GA can quickly search for the optimal solution, which agreed with the principle of the largest heat release. The results could be considered as reference values in formulation design.

    Optimization of the remote network monitoring system of central heating
    TANG Yu-Feng, TIAN Mao-Cheng, ZHANG Guan-Min, JIANG Bei
    JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE). 2009, 39(5):  153-158. 
    Abstract ( 374 )   PDF (559KB) ( 1766 )   Save
    Related Articles | Metrics

    In view of the situation that central heating systems have multiple heat stations which are similar in functional structure, optimization design was carried out on the program and variable structure of remote network monitoring system in central heating. Based on the structural analysis, the heat station monitoring system was divided into several different functional units. By using the structural design philosophy, the variables involved in the process were taken asthe function parameters, and four typical control process of the monitoring system were designed as common function modules. In order to simplify the definition and reference of the variables, seven basic variable models were sorted out according to the system’s functional structure characteristics, and optimized in form of structure body. A practical engineering application showed that the use of process function module and structure body can improve the program transportability, lower the development workload, and make the multisubstation monitoring system grow easily.