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Table of Content

15 November 2013 Volume 26 Issue 11
  
    Articles
    Business Competition Pattern Analysis Based on Two-Person Zero-Sum Games
    XU Fusheng,SHANG Xufeng,XU Dingding,WU Fang
    . 2013, 26(11):  1. 
    Abstract ( 886 )   PDF (661KB) ( 718 )  
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    Based on the idea of two-person zero-sum games,this paper analyzes the model of the business competition in which the two sales companies promote similar products in social networks.A mathematical optimal model is established,the simulation is done,and the optimal allocation of financial and human resources in the company competition obtained.

    A Quasi-Newton Nonmonotone Trust Region Method of New Conic Model
    LI Xiaowei,QIAN Huimin
    . 2013, 26(11):  4. 
    Abstract ( 783 )   PDF (644KB) ( 833 )  
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    A trust region algorithm based on new conic model is presented for unconstrained optimization by combining the nonmonotonic wolfe line search and quasi-newton technique.A new trust region subproblem is constructed,in which the trust region radius uses the information of gk and Bk.The subproblem is solved by using cp||B-1k+1|| ||gk+1||],c∈(0,1),p is a nonnegative integer.Therefore,instead of adjusting Δk,one adjusts p for each iteration.Under proper assumptions,the global convergence of the method is proved.

    Research on DV-Hop Wireless Network Localization Algorithm
    HU Huapeng,HU Fangming,ZHOU Dun,ZHANG Zhao
    . 2013, 26(11):  7. 
    Abstract ( 780 )   PDF (484KB) ( 686 )  
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    As a result of the shortage of the positional accuracy for DV-Hop location algorithm in wireless sensor networks,the article proposes a modified DV-Hop algorithm.The improved algorithm introduce uniform quantization model into the original one to improve the accuracy of every period of jump distance and least square method to solve accumulated error in the location.The simulation results prove that the improved algorithm has prominent improvement in positioning accuracy of unknown nodes.

    A Fault Self-diagnosis Algorithm for a Cluster Based Wireless Sensor Network
    LIU Yahong,LIU Hao
    . 2013, 26(11):  10. 
    Abstract ( 719 )   PDF (633KB) ( 689 )  
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    Energy-efficient cluster based wireless sensor networks are often used to transmit information.In case of failure in WSN,the diagnosis accuracy of the cluster-head nodes should be guaranteed.In this paper,a fault self-diagnosis algorithm is presented with two steps to determine the final state of each node:first,the sensor nodes are identified based on comparisons of data from neighboring nodes,and then further tests are performed to avoid diagnosis errors.Simulation results show that the two-step algorithm has good accuracy and precision of diagnosis.

    Three-dimensional Multi-UAV Cooperative Path Planning Based on Improved SAS Algorithm
    WANG Kuimin
    . 2013, 26(11):  14. 
    Abstract ( 739 )   PDF (1003KB) ( 601 )  
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    Reliability is the major concern in practical path planning.Intelligent algorithms are adopted to solve the problems of multiple constraints and complex and time-consuming planning of multi-UAV cooperative path planning for better reliability.A heuristic algorithm for SAS is proposed.Simulation results show that the proposed path planning algorithm has good path reliability.

    More Nectar Bee Colony Algorithm for Wireless Sensor Network Coverage Optimization
    SONG Suming,ZHANG Yan,CHEN Yuan
    . 2013, 26(11):  17. 
    Abstract ( 881 )   PDF (1141KB) ( 668 )  
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    An artificial Bee Colony algorithm with multiple nectar sources based on interactive mechanism for coverage optimization of WSNs is proposed based on artificial bee colony and wireless sensor networks (WSNs),.The algorithm applies the selection strategy providing sensitivity as well as pheromone instead of roulette wheel rule during the exploiting process of onlookers.And interactive strategy is involved to accomplish the neighborhood search of onlookers.In addition,new nectar is generated by the OBL strategy to update the worst nectar at the end of each iteration.The simulation results show that the algorithm enables a more uniform distribution of the sensor nodes within the detection area,and achieves better network's overall coverage through a smaller number of iterations.It has a critical influence on prolonging the lifetime of the entire WSNs and reducing network energy consumption.

    An Improved Method of Car License Plate Recognition Based on SVM
    XUE Dan,SUN Wanrong,LI Jingjing,JIA Hailong,YANG Zifeng,WANG Zheng
    . 2013, 26(11):  22. 
    Abstract ( 744 )   PDF (740KB) ( 700 )  
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    An improved recognition method of license plate based on support vector machine (SVM) is proposed in this paper.The features of grid,horizontal projection and vertical projection density are extracted after character thinning treatment.The feature vector set of three features has overall and local features of the characters,and low dimension.Based on SVM,plate numbers are recognized through feature vector sets.For confusing characters,a second recognition algorithm is put forward according to their respective features,which solves the problem of confused character recognition efficiently.Experiment results show that the algorithm has good robustness,strong anti-jamming ability,and a high recognition rate to 98.58%.

    Optimization of Cloud Content Routing Based on the Bloom Filter
    YU Ye,JIN Yichao,YIN Liying
    . 2013, 26(11):  26. 
    Abstract ( 835 )   PDF (944KB) ( 734 )  
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    With the rapid advances on Tri-networks integration in China,the traditional broadcasting content service mode can no longer meet the increasing requirements on interactive content service mode.The key to this problem is an elastic and efficient cloud-based media network by leveraging cloud computing technology.This solution has been considered as the key of the Next Generation Broadcasting Network (NGB).One of the critical design objectives is to further improve the mean response time in this cloud-based media network.This paper proposes the use of a global Bloom Filter to improve the content routing schemes.Specifically,we design two improved routing schemes (i.e.,parallel scheme and cut-through scheme) after introducing Bloom Filter,to reduce the mean response time.We formulate both the traditional and the proposed routing schemes as queuing models,and simulate them by using OMNeT++.The analytical results agree well with the numerical ones.The results show the proposed schemes can save up to 65.2% mean response time in different networking scenarios.

    An Experiment Multicast Network Based on the Virtual Machine and the Software Router
    XU Xiangyu,LI Yinfeng,DONG Tao
    . 2013, 26(11):  32. 
    Abstract ( 830 )   PDF (961KB) ( 910 )  
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    Internet video playback consumes a lot of bandwidth.The multicast technology can reduce the bandwidth usage of video playback and the load of video servers.At present,only some expensive hardware routers have the function of multicast.This paper proposes a solution by using the rapid developing emerging technologies of virtualization and software routing to set up a multicast network consisting of multiple software routers on the virtual machine to build the multicast video server.The feasibility of the program is proved by testing the effect of the multicast network.

    The Theory for Spatial Spectrum Estimation in the Dual Channel Receiver
    ZHANG Wei,ZHAO Yimin,ZHANG Min
    . 2013, 26(11):  36. 
    Abstract ( 714 )   PDF (478KB) ( 653 )  
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    This paper analysis the theory and algorithm of the high resolution spatial spectrum estimation,and gives a realization method of dual channel receiver in the spatial spectrum estimation,it is based on the single channel receiver theory in the spatial spectrum estimation.The algorithm for estimating the covariance matrix of the array sensor outputs using a weight perturbation technique is presented.

    Compressive Sensing Based Narrowband Signals DOA Estimation
    GUO Yueqiang,CHEN Jianchun,WANG Yongjun
    . 2013, 26(11):  39. 
    Abstract ( 791 )   PDF (500KB) ( 795 )  
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    The spatial signal DOA estimation problem is investigated based on compressive sensing in this paper.For the problem in DOA of spatial signals that the ordinarily algorithms need a large number of sampling and can't gain ideal effect in condition of low SNR.A multi-vectors focal undetermined system solver (MFOCUSS) DOA algorithm based on singular value decomposition in proposed in this paper.The algorithm overcomes the defect that sparse reconstruction algorithms cannot be used in a low SNR case,and has a lower computational complexity.Experimental simulations show that the presented algorithm in this paper performs better than traditional DOA algorithms for signals with any coherence.

    Subsampling Relevant Difference Algorithm and Doppler Error Correction
    CUI Xinxin
    . 2013, 26(11):  42. 
    Abstract ( 674 )   PDF (831KB) ( 578 )  
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    Signals are restored by multi-period sampling to overcome the time-delay of sub-sampling high frequency signals and reduce the complexity of estimation.These signals are used for the time-delay estimation with noise interference.The performance analysis and Doppler error correction are given.Simulations prove the validity of this method.

    OFDM Synchronization and Sparse Channel Estimation by Using ZC Sequences
    SUN Hu
    . 2013, 26(11):  47. 
    Abstract ( 1025 )   PDF (742KB) ( 836 )  
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    A new pilot with the ZC sequences is designed for the OFDM system to achieve the symbol timing synchronization,the frequency offset estimation and the sparse channel estimation in the time domain.The symbol timing synchronization is performed without local sequences.The frequency offset estimation is completed without FFT.In the sparse channel estimation,a Compressed Sensing (CS) matrix formed by the ZC sequences is optimized,and the sparse channel in the time domain can be sensed by the CS matrix optimized and reconstructed via Orthogonal Matching Pursuit (OMP) algorithm.Simulation results show that the new pilot can fulfill the synchronization and sparse channel estimation in the time domain precisely.

    Analysis of Adaptive Filtering Algorithm Based on RMMSE Criteria
    QU Yong
    . 2013, 26(11):  51. 
    Abstract ( 825 )   PDF (670KB) ( 661 )  
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    In view of the strong out-of-window scatterers,an adaptive filter based on minimum mean square error (MMSE) criteria is employed to estimate the high range resolution profile of the extended target.This approach estimates the amplitudes of each range cell in an iterative way.A simulated performance comparison is made between the Reiterative-MMSE (RMMSE) algorithm and the matched filter and least-squares (LS) algorithm.Simulation results show that the algorithm can estimate the amplitudes of the multiple scatterers effectively.

    Radar Signal Pre-sorting Based on K-Means Algorithm
    NIE Xiaowei
    . 2013, 26(11):  55. 
    Abstract ( 793 )   PDF (624KB) ( 681 )  
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    K-Means algorithm finds wide applications in radar signal pre-sorting.The traditional K-Means algorithm depends largely on the number of clusters and the initial setting of cluster centers.It is also very sensitive to noise and outliners.In order to solve these problems,a radar signal pre-sorting method which combines the distance method with the improved K-Means algorithm is presented in this paper.Simulation shows that the proposed method effectively reduces the influence of noise and outliners on K-Means clustering algorithm.

    Grounding of the Electromagnetic Shielding Laboratory
    GUO Hao,ZHANG Busheng,LIANG Ting
    . 2013, 26(11):  59. 
    Abstract ( 686 )   PDF (567KB) ( 656 )  
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    This paper introduces the purpose and the classification of grounding.Proper design and fixture of grounding is of great important for the electromagnetic shielded laboratory.The grounding devices and systems for the electromagnetic shielding laboratory are analyzed in detail.Several applied design methods and advices are proposed.

    A Novel RFID Antenna Design on Metallic Objects
    LEI Xu,YIN Yingzeng,WANG Jun
    . 2013, 26(11):  62. 
    Abstract ( 625 )   PDF (794KB) ( 812 )  
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    This paper presents a novel RFID tag antenna for metallic objects.This antenna contains a coupling ground and wing-shape radiation patch.The antenna has the compact size of 84 mm×25 mm×4.5 mm.If the Circularly polarized reader antenna gain is 7.5 dBi,the radiated power is 30dbm,the reading distance can be reached to 10 m in 902~928 MHz range.The measured results indicate that the tag antenna has a good long-range recognition performance on the surface of the metal objects.

    Methods of Moments for Calculation of Composite Electromagnetic Scattering of Rough Surface and Target Ship
    ZHANG Kai,QU Peihua
    . 2013, 26(11):  65. 
    Abstract ( 714 )   PDF (601KB) ( 658 )  
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    The building process of the integral equation is given.The one dimensional PM above the rough sea surface and the composite ship target electromagnetic scattering characteristics of two-dimensional conductors are studied.Based on the method of moments block matrix and the information of the rough surface,the composite scattering coefficient is obtained,the effect of the wind speed,angle of incidence and the ship's draft depth on which the results is studied.Results analysis verifies the effectiveness of the proposed method.

    Design and Implementation of S-band PLL Frequency Synthesizer Based on ADF4350
    YU Weijian,ZHANG Juan
    . 2013, 26(11):  69. 
    Abstract ( 839 )   PDF (601KB) ( 848 )  
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    Frequency synthesizer is the key part of modem communications systems,which are widely used in digital communications,satellite communications,TT&C,radar,navigation and other fields.ADF4350 is the broadband frequency synthesizer produced by ADI Co.with phase noise low.The basic principle and performance standard of PLL frequency synthesizer are introduced in this paper.A hardware structure for realizing frequency synthesizer based on ADF4350 and implementation methods are given,and the main indicators of the test.

    An Improved Method for Multiplicative Noise Removal Based on the Nonconvex Regularization Model
    YU Ting,ZHANG Zhenshan
    . 2013, 26(11):  71. 
    Abstract ( 990 )   PDF (1178KB) ( 782 )  
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    In view of the fact that non-convex regularization model is sensitive to noise in removing multiplicative noise and the suppression capability is weak for greater intensity noise,an improved image denoising model is proposed.In the new model,multiplicative noise is first transformed into additive noise by Logarithmic transformation,and Gaussian convolution is then introduced into the regularization term and the fidelity term for smooth image preprocessing and more details of edge so that the edge is located accurately.The new model is robust and can smooth according to the characteristics of the image,and therefore the edges are better preserved.Numerical experiments show that the new method of denoising results has a greatly increase on quantitative indicators and a remarkable improvement on the visual effect.The new method has distinct advantages especially for large noise.

    The Research on Test Method of Characteristic Impedance in PCB
    LI Jingang
    . 2013, 26(11):  77. 
    Abstract ( 770 )   PDF (694KB) ( 1242 )  
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    Today the development of electronic technology is developing rapidly,and the large scale,very large scale integrated circuit are more and more applied to general system。now new serial bus rate can be as high as dozens of Gbit·s-1,in such a rate,if the impedance of the transmission line does not accord with a standard,it would lead to serious crosstalk between transmission line,that will directly affect the quality of the PCB.In order to go further into the research on the test method of characteristic impedance,this article introduces the elementary knowledge of TDR test method and principium about characteristic impedance in PCB in detail,which presents the theoretical guidance and practical reference for the future PCB characteristic impedance test workers.

    Simulation of the Holographic Antenna
    ZHANG Hua
    . 2013, 26(11):  80. 
    Abstract ( 693 )   PDF (814KB) ( 736 )  
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    Reconfigured antenna is a developing special antenna.The use of holographic antenna to realize reconfigured antenna pattern is described.The relationship of the holographic frame and the required radiation pattern are analyzed by computer simulation.The pattern scanning can be achieved simply by adjusting the holographic frame.

    Use of the Digital Phase-locked Tracking Loop to Improve the Detection Accuracy of Encoder
    CHEN Yinguo1,2,ZHANG Qi 3
    . 2013, 26(11):  83. 
    Abstract ( 820 )   PDF (602KB) ( 710 )  
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    The digital phase-locked loop is used to improve the accuracy of the encoder.First,the sine and cosine of the original signal and the feedback of the cosine and sine signals are input to the same phase detector  for multiplication and subtraction to remove the high frequency components,thus a better dynamic range of the PLL.The "reversible counter+digital sine/cosine wave table" approach is adopted to generate cosine/sine signals containing direction information,which achieves the static or transient position detection.This method improves the detection accuracy of conventional encoder,grating and other conventional detection device s by at least two orders of magnitude.

    A Novel Design of the Missile borne Telemetering Communication Antenna
    LI Shangxuan,CHEN Tuo,DANG Lin,WEN Tao
    . 2013, 26(11):  86. 
    Abstract ( 998 )   PDF (777KB) ( 684 )  
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    A new type of missile-borne communication antenna is proposed.The requirement of small size and wide frequency bandwidth are met by loading slots and CPW-fed structure.The characteristics of E-plane omni-directional and broadband are shown by the simulated data.The structure of the antenna is characterized by small size,simple feeding,broadband,simple structure and easy fabrication.

    Study on Single Event Effects and Simulation Technology
    SUN Ye,FANG Zhigang,CHEN Huizhao,HUANG Wei,ZHANG Ju
    . 2013, 26(11):  89. 
    Abstract ( 890 )   PDF (871KB) ( 783 )  
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    As the important signal processing devices in the satellite,SRAM FPGA single event effects radiation-hardened and radiation-hardened validation have been receiving constant attention.This paper studies the two radiation hardening methods of triple modular redundancy and dynamic refresh,and designs a fault injection simulation.The radiation-hardened method is validated successfully,and the results show that the proposed reinforcement method can improve the performance of the anti-single-particle.

    Design of TAWS Simulator
    LI Shiyang1,2,HE Fang 3,ZHAO Chunling 2,XIAO Gang 3
    . 2013, 26(11):  93. 
    Abstract ( 821 )   PDF (883KB) ( 803 )  
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    Terrain Awareness and Warning System (TAWS) can effectively prevent accidents caused by Controlled Flight into Terrain (CFIT) or severe windshear,thus greatly improving the safety of civil aviation.Currently,the research and application of TAWS is relatively mature abroad,while the domestic one is still in its infancy.Based on the study of the Enhanced Ground Proximity Warning System (EGPWS),a design of the TAWS simulator is proposed,followed by the detailed implementation of the functional modules,to provide a strong support for the avionics system simulation,testing,and validation and interface control document (ICD) design for sophisticated avionics systems.

    Design of A Tri-band MIMO Antenna for WLAN/WiMAX Operation
    YANG Song,LI Yanliang
    . 2013, 26(11):  96. 
    Abstract ( 878 )   PDF (609KB) ( 673 )  
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    A tri-band printed diversity antenna for 2.4/3.5/5.2 GHz WLAN/WiMAX operation is proposed.The antenna consists of two orthogonal E-shaped monopoles placed symmetrically with respect to a protruding T-shaped ground plane.The E-shaped monopole can lead to three resonant paths,which can achieve three frequency characteristics.And the antenna can has a highly decoupled port for the use of T-shaped ground plane.The simulation result show that the antenna has good impedance matching with high isolation (S12<-15 dB in most of the band) for frequencies at the 2.4 GHz,3.5 GHz and 5.2 GHz WLAN bands.

    Narrowband Interference Suppression Based on Complex Adaptive Notch Filter
    XEI Mengmeng,WANG Yongchao
    . 2013, 26(11):  99. 
    Abstract ( 891 )   PDF (1099KB) ( 728 )  
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    This paper researches the different amplitude narrowband interference suppression in direct sequence spread spectrum communication system and introduces a cascade structure of the notch filter with one-order complex adaptive notch filter as notch cell,and makes a theoretical analysis of the adaptive algorithm for coefficient iteration.Simulation results show that the notch filter can effectively eliminate multiple narrowband interferences,and the corresponding iterative algorithm has good convergence performance.

    Design of Weak Signal Detection System
    WANG Shiyuan,LI Qiang,ZHU Xiaobing,CHEN Shengjian
    . 2013, 26(11):  104. 
    Abstract ( 879 )   PDF (890KB) ( 1065 )  
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    A weak signal detection system based on the cross-correlation detection technology is designed and implemented to solve the problem that the pressure sensor output signal is weak and usually mixes with noise and interference.Transformer pressure sensor is used as the pressure signal detection device.Generated by the monolithic integration function signal generator ICL8038,and amplified by the power amplifier TDA7294,the sine wave signal is used as the modulation signal of the sensor signal and the demodulated reference signal of cross-correlation detection.The balanced modulator/demodulator AD630 is used to build the lock-in amplifier.After being amplified,filtered and rectified,a DC signal is obtained.Simulations and experiments show that the system has an ideal effect on the detection of weak signal,and is suitable for the detection of weak signals mixed with strong background noise.

    Wireless Sensor Networks Based on Intelligent Street Lighting System
    KONG Lingrong,WANG Hao
    . 2013, 26(11):  108. 
    Abstract ( 898 )   PDF (809KB) ( 678 )  
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    City lighting is a large comprehensive system.LED remote control system can not only reduce the light turning up time but also reduce the management cost of the lighting system.The LED lighting technology and ZigBee protocol technology are introduced,and a wireless LED street light remote control system is presented.The bottom of the structure is the street light nodes,the middle is the rooter modules,and the top is the computer control terminals.TI cc2480/ZigBee is used to develop the platform of wireless control system.The development of network,firmware flow chart and power-saving algorithm are also discussed.The design provides an automatic  urban street lighting with low-cost and high power efficiency based on ZigBee wireless technology.

    Simple Implementation of Color Space Conversion Based on FPGA
    YU Changsheng,HAN Xiaojing,LI Zhida
    . 2013, 26(11):  111. 
    Abstract ( 629 )   PDF (609KB) ( 758 )  
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    This paper designs a simple method for color space conversion in FPGA.First,the decimal coefficients in transformation matrix are changed into integers through a left shift operation,then nine adders and nine constant coefficient multipliers are instantiated to implement the conversion in parallel pipelines with Verilog HDL,and finally the correct values are obtained through a right shift operation.This method is simulated with Modelsim and verified on Xilinx FPGA hardware platform by converting RGB to YCbCr422.

    A New PWM DC Motor Drive
    WEI Shen,WANG Yuye
    . 2013, 26(11):  114. 
    Abstract ( 834 )   PDF (807KB) ( 741 )  
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    This paper proposes a PWM converter with dissipative structure.Effective rapid disposal of motor braking using resistors is realized to avoid loading failure caused by the rising voltage of capacitance.Based on an analysis of the process of two loading modes,the paper discusses the control on the load of torque by current command in different loading modes.Simulation results prove the feasibility of the converter structure for fast torque tracking.

    A New Method for Parameter Estimation of Frequency-hopping Signals Based on STFT
    QIN Yongli,LV Ming
    . 2013, 26(11):  118. 
    Abstract ( 814 )   PDF (687KB) ( 527 )  
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    As for the contradiction between resolution of time and resolution of frequency in FH signal parameter estimation,a new frequency-hopping signal parameter estimation method based on STFT is proposed by analyzing the influence of function window of STFT on the time-frequency spectrum.The method exploits the parameter of function window to extract the parameter of frequency-hopping signal directly avoiding the influence of time-frequency spectrum on the accuracy of estimation.The essence of this method is to seek the time-frequency spectrum which has the best time-frequency concentration and get the parameter of target function window by changing the time of beginning and the width of the function window.Simulation results show the method is efficient to estimate the parameter of frequency-hopping signals.

    Comparison of Three Types of Radar Pulse Compression Signals
    SHI Zhimin
    . 2013, 26(11):  122. 
    Abstract ( 868 )   PDF (638KB) ( 568 )  
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    In this paper,linear frequency modulation (LFM) signal,non-linear frequency modulation (NLFM) signal and phase-coded signal are applied in pulse compression radar system.The basic principles and the mathematical model of these three signals are introduced.Based on the MATLAB simulation,the pulse compression effect of the three types of radar pulse compression signals can be compared by analyzing the pulse compression amplitude and the mainlobe-tosidelobe rate with same parameters.

    Multi-cell Lithium Battery Charging Management System Based on BQ77PL900
    HU Guomin,ZHOU Zhijing
    . 2013, 26(11):  125. 
    Abstract ( 886 )   PDF (816KB) ( 813 )  
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    Multi-cell lithium batteries are widely used in variety of electronic equipments because they can provide high voltage and current.Management for multi-cell lithium battery charging and discharging is quite important which includes cell balancing,over-current/short-circuit protection,over-temperature protection and so on.A new multi-cell lithium battery charging and discharging management based on BQ77PL900 and PIC18LF4520 is put forward in this paper,and the software and hardware design are illustrated in detail.Experiment results demonstrate that this circuit can successfully achieve multi-cell lithium battery charging and discharging.

    Study on Vibration Experiment of Active Mounting Plate
    WANG Mei,ZHANG Shanshan
    . 2013, 26(11):  129. 
    Abstract ( 725 )   PDF (699KB) ( 678 )  
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    Active mounting plate is in the state of vibration when it is working.Violent vibration would cause structure damage of active mounting plate and shorten its service life.So it is important to conduct vibration test on active mounting plate.Test method is designed in this paper and the vibration experiment is done of a certain type of radar active mounting plate.The comparison charts of feature level curves in the directions of X,Y,Z between the first and last test are given.Test results are analyzed and the structure design of the active mounting plate is evaluated.

    Analysis of Technology of Signal Synthesis In Channelized DRFM System
    LIU Qingjie
    . 2013, 26(11):  132. 
    Abstract ( 755 )   PDF (659KB) ( 635 )  
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    Digital radio frequency memory (DRFM) technology can keep jamming signals being coherent with radar signals,and it has become an important method to jam new system Radar.In this paper,the fundamental principle of DRFM and the implementation of channelized DRFM are introduced.In addition,the impact of the number of channels,the overlap bandwidth of channels and the synthesis method of signals on the quality of signal synthesis is analyzed in detail by simulation.It also provides a theoretical basis for the broadband DRFM system.

    Design of an Intelligent Portable Water Quality Detector
    LIU Yuanyuan
    . 2013, 26(11):  135. 
    Abstract ( 842 )   PDF (654KB) ( 487 )  
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    This article analyses the examination method of water quality,puts forward the Lambert-Beer law as the basis of measuring the aqua strength,calculates the relationship between the material absorbency and the aqua strength on the middle and high strength by Least square method,and designs the holistic system structure.The redundant chlorine parameter of aqua is taken as an example to analyze the authentication of the water quality detector.The results show that the equipment has good stability and linearity with better accuracy in medium and high concentration detection,and meets the rapid aqua detecting demands of different industries.

    Design of a Car Mirror Control System Based on the LIN Bus
    LI Jianwen,ZHENG Yi,BU Jianguo,HE Hong,ZHANG Weifeng
    . 2013, 26(11):  139. 
    Abstract ( 861 )   PDF (718KB) ( 746 )  
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    CAN control network protocol is employed in most automotive body electronic control systems,but the need data transfer rate of automotive mirror control is very low,and the use of CAN bus communication has higher cost.LIN bus is an auxiliary bus network,which is low in cost and able to achieve the data communication with only one wire.The design of the network based on LIN bus can achieve the control on the left and right rear-view mirror of the bus.And the low power consumption and fault self-diagnosis function is designed to reduce the late maintenance costs,providing a viable solution for practical application.

    Mine Intrinsically Safe Power Supply Circuit and Its Matlab Simulation
    LV Feng
    . 2013, 26(11):  143. 
    Abstract ( 706 )   PDF (532KB) ( 799 )  
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    The mine intrinsically safe power supply plays an important role in complex coal mine environment.A detailed analysis of mine intrinsically safe power supply circuit is given,a detailed description of all aspects of the selection and protection circuits use are presented,and a Matlab simulation of the filter circuit is made.

    A Technology of Uncertain XML Sequence-based Holistic Twig Pattern Matching
    WANG Peng, ZHANG Xiao-Lin
    . 2013, 26(11):  146. 
    Abstract ( 928 )   PDF (822KB) ( 533 )  
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    In view of the problem that reduces the query efficiency since sequence-based algorithm of uncertain XML twig pattern matching PrTRIM(Probabilistic TRee Indexing and Matching) needs two stages of subsequence matching and structure matching.H-PrTRIM(Holistic Probabilistic TRee Indexing and Matching) algorithm based on PrTRIM algorithm is thus proposed. It merges subsequence matching and structure matching that in PrTRIM algorithm into one and carries out subsequence matching and structure matching at the same time in H-PrTRIM algorithm. Hence the result of subsequence matching is the final result of query. The problem that reduces the query efficiency since too much intermediate results of subsequence matching is solved. The results of experiment show that H-PrTRIM algorithm is more efficient than PrTRIM algorithm and has advantages in the case of querying large documents and complex query.

    Programming Techniques of Network Communication Based on Visual C#
    LIU Bei-Li, LIU Da-Hong
    . 2013, 26(11):  151. 
    Abstract ( 917 )   PDF (518KB) ( 645 )  
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    This paper introduces the use of Visual C# language to communicate in TCP/IP network.The TcpClient class and the TcpListener class provided by .NET framework are employed to build the server and  clients.Then methods of these two classes can realize sending and receiving messages.It is shown that the software interface is friendly and the program can accomplish communication well.

    Design of a Distributed Parameter Water Quality Early Warning System Platform Based on GPRS
    ZHANG Kai-Xiao, ZHANG Sen, WANG Cheng-Jie, TAI Fei, HU Li-Qun, CHEN Dun-Jun
    . 2013, 26(11):  154. 
    Abstract ( 799 )   PDF (673KB) ( 554 )  
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    This paper describes a wireless multi-parameter water quality warning system platform.Multi-parameter sensor data are transmitted through the General Packet Radio Service (GPRS) to the system platform,and the data are delivered after identification to the corresponding sensor analysis program,which returns the analysis results back to system platform to give he final comprehensive measurement results.The early warning module realizes multi-parameter water quality early warning.The results show that GPRS is capable of large data transfer between different types of sensors,computers,networks,and users.GPRS-based distributed multi-parameter water quality warning system platform has high practicability and broad market prospects.

    Medical Image Fusion Algorithm with Image Features Based on Intuitionistic Fuzzy Reasoning
    LI Si-Tong, NA Yan
    . 2013, 26(11):  157. 
    Abstract ( 1034 )   PDF (666KB) ( 473 )  
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    In view of the limited application of Intuitionistic Fuzzy Reasoning in medical image fusion at present,a new method has been presented by introducing features of image into the Fusion algorithm as one of the fusion conditions.Experiments results show that the proposed algorithm is superior to the ones based on the traditional Intuitionistic Fuzzy reasoning.

    Application of Electric Power Communication Tower Resources Management Based on Internet of Things
    ZHAO Zhi-Yu
    . 2013, 26(11):  160. 
    Abstract ( 1047 )   PDF (822KB) ( 662 )  
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    This paper introduces the application of RFID based on Internet of things,The construction of the electric power communication network resource management system and rod lines connected with each lap and hanging cable network realize intelligent and efficient management of hanging cables to ensure the safety of power transmission towers,and secure and ordered communication resource uses.

    Research Review of Ba(B'1/3 Ta2/3)O3 Microwave Dielectric Ceramic
    DONG Yi-Ming, CHENG Kai, WANG Lu-Ning
    . 2013, 26(11):  163. 
    Abstract ( 953 )   PDF (646KB) ( 424 )  
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    Dielectric ceramic is the key material for microwave components.Complex perovskite Ba(B'1/3 Ta2/3)O3(B'=Mg、Zn) is widely applied in the modern microwave communication for its high quality factor at microwave & millimeter-wave frequency.This paper reviews the present research status and introduces the latest progress in this microwave dielectric ceramic.

    Application of TD-LTE in Flood Control
    QIN Chao-Jie
    . 2013, 26(11):  167. 
    Abstract ( 972 )   PDF (611KB) ( 570 )  
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    The next generation of mobile communications and broadband wireless access integration model,TD-LTE communication technology is China's independent innovation of the evolution of TD-SCDMA technology,which adopts the advanced technology of LTE communication system characterized by TDD duplex mode,and is one of the mainstream broadband mobile communications standards.This paper analyzes the key technologies and characteristics of the TD-LTE network architecture with emphasis on its application in flood control.

    System Communications Technologies Based on Information Collection
    WANG Li-Peng, REN Shun-Hang, LV Peng-Peng, SHANG Qiu-Feng
    . 2013, 26(11):  170. 
    Abstract ( 938 )   PDF (577KB) ( 625 )  
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    The electric energy data acquire system is capable of the acquisition,processing and real-time monitoring of users electricity information by the use of communication technology,computer technology and automatic control technology to realize the electric energy data acquisition,load control,automatic meter reading.Communication technology is of particular importance r in power-expenditure information acquisition system,and is the key to the development of electric power system automation.This article deals with the application of communication technology in the information collection system from the three aspects of local communications,telecommunications and communications protocols,with an analysis of different means of communication.

    Literature Review of Power System Load Forecasting Methods
    LU Yu-Ye, ZHANG Jian-Zhao, XU Yan-Zhe, FANG Jia-Yu
    . 2013, 26(11):  173. 
    Abstract ( 1315 )   PDF (571KB) ( 438 )  
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    The foundation of power system operation scheduling and production planning,accurate load forecasting can improve system security and stability,and reduce electricity generation costs.This paper introduces theories of other areas to improve the classification modeling and forecasting of power system load forecasting.The future trend is also discussed.

    Research on Typical Routing Protocols of MANET
    FAN Qing-Gang, YE Xue-Mei, CAI Yan-Ning, ZHU Yun-Jie
    . 2013, 26(11):  176. 
    Abstract ( 770 )   PDF (626KB) ( 489 )  
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    With the development of Internet,MANET has become a hotspot of research.After a brief introduction to the difference of routing protocol between MANET and existing communication systems,the typical routing protocols of DSDV,AODV and DSR are discussed in detail,and the future trend of routing protocol of MANET is pointed out.

    Evolution of Hidden Markov Model for Hidden Group Detection
    HUANG Ying
    . 2013, 26(11):  179. 
    Abstract ( 764 )   PDF (558KB) ( 539 )  
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    An approach to hidden group detection in social network based on hidden Markov evolution model is proposed.Different from conventional methods,we begin with reasonable assumptions for the micro-laws to determine whether at any given time a particular individual is in a community or not,based on which we are able to discover the individual dynamics that drive the evolution of the social groups in a community.Finally,we identify persistent groups over a time period long enough as potential hidden groups.Further analysis is made to ensure the high probability of these groups to be satisfactory results.Experiments on synthetic data as well as real communities (e.g. Enron email) are performed.

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