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Table of Content

15 May 2015 Volume 28 Issue 5
  
    Articles
    A New Technology of ThreeDimensional Space Digital Watermarking Based on Integral Imaging
    LIU Yiqun,ZHANG Jianqi,WANG Xiaorui,LUO Peng
    . 2015, 28(5):  1. 
    Abstract ( 762 )   PDF (826KB) ( 524 )  
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    In recent years,threedimensional space digital watermarking has become a new hotspot in optical information security.This paper presents a new threedimensional space digital watermarking technology based on integrated imaging.Threedimensional digital watermarking is generated by the computational integral imaging system that is implemented with the smart pseudoscopictoorthoscopic conversion model.The discrete wavelet transform algorithm is applied to embed and extract the threedimensional digital watermarking.Threedimensional digital watermarking is identified and shown by the integral imaging system.The feasibility and effectiveness of the proposed technology is demonstrated by experiment.The new technology is robust and secure;its image quality and display quality can also meet the criteria of the human visual model.The proposed technology opens up a new research perspective for the copyright protection of threedimensional digital multimedia products.

    Effects of Pin cap and NDW on Delay Calculation Precision
    SUN Xu,PANG Zhengbin,LI Yuan
    . 2015, 28(5):  5. 
    Abstract ( 802 )   PDF (793KB) ( 696 )  
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    Due to the constraints from the simulation tool and some external factors,it is impossible to create a liberty delay calculation model which is fully consistent with the actual device when characterizing timing library.In order to build a more accurate delay calculation model,the concept of Multiple Input Pin Cap Model (pincap) and normalized driver waveform (NDW) is introduced into the Effective Current Source Model (ECSM) by Cadence.This paper is intended to study the difference between timing correlation results caused by the multiple input pincap model and the NDW in ECSM,by means of performing accurate comparison of STA timing results with Spice path based simulation.Research shows that the ECSM library,if combined with pincap and NDW,will be more conducive to the accurate calculation of delay,thus getting more credible timing analysis results.

    Realization of Cylinder Projection Arithmetic Based on FPGA
    WU Xiaobing
    . 2015, 28(5):  9. 
    Abstract ( 604 )   PDF (691KB) ( 632 )  
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    The principle of the cylinder projection arithmetic is introduced.A system design based on hardware logic is presented.The design starts with writing the image data into DDR2 SDRAM,and then realizes the cylinder projection arithmetic with hardware logic on Cyclone III series FPGA produced by Altera company.At the same time it creates a CameraLink schedule which is delivered to the backend,and then displays the converted data on LCD via DVI interface in real time.The display results on LCD show that the cylinder projection realized by hardware achieves anticipated results.

    An Improved Topology Control Algorithm in Cognitive Radio Networks
    YE Mingjie
    . 2015, 28(5):  13. 
    Abstract ( 539 )   PDF (678KB) ( 465 )  
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    The robust network topology,the interference to primary users and the interference among secondary users are important indicators to measure network performance in channel assignment of cognitive radio networks.By assuming that the channel occupancy time is negatively exponentially distributed,an indicator which makes a tradeoff between the interference to primary users and the interference among secondary users is given.Then,we propose an improved topology control algorithm based on the channel selection criteria of central robust topology algorithm.Simulation results show that the ITCA which makes a tradeoff between the interference to primary users and the interference among secondary users is bigger in throughput and lower in collision rate than CRTCA.

    High Speed Serial Data Acquisition System Based on JESD204 Protocol
    RAN Yan,XI Pengfei
    . 2015, 28(5):  17. 
    Abstract ( 711 )   PDF (890KB) ( 568 )  
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    In systems where communication infrastructure,imaging equipment,and industrial instrumentation need large data,it is needed that the data conversion stage provides increasingly wide resolution and high sampling rate.The parallel interface's physical layout and the serial LVDS method's bit rat bring technical barriers to designers.In this paper,the JESD204B protocol is realized based on Xilinx Vertx6 FPGA's GTX,which helps solve the problems in traditional data acquisition parallel transmission.

    Application of an Improved BP Neural Network in Handwriting Recognition
    XUE Haotian,YANG Jingdong,TAN Kaide
    . 2015, 28(5):  20. 
    Abstract ( 695 )   PDF (803KB) ( 590 )  
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    Traditional shadow learning has a simple structure and fast algorithm but a relatively high error rate,and is easy to step into the localminimization.This article discusses a deep structure call Deep Belief Network (DBN),which is used to optimize the initial value of the traditional BP to get a better testing result.And we use the dropout skill to modify the hidden unit of BP to get a fast training speed.The experiments in the article show that using DBN and dropout to modify the BP can decrease the error rate and improve the realtimeness.

    An Adaptive Fusion Method for Infrared and Visible Images
    SHU Jiuming
    . 2015, 28(5):  24. 
    Abstract ( 443 )   PDF (878KB) ( 430 )  
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    This paper presents an adaptive fusion algorithm for infrared and visible images.This algorithm can change the fusion parameters adaptively based on the current image characteristics.First,the paper analyzes the features of infrared and visible images;then,the existing fusion algorithms based on wavelet transform are simulated;finally,an adaptive fusion algorithm based on wavelet transform is presented and verified.The results show that this algorithm provides better subjective visual effect,and evaluation parameters acquired are improved to some extent.

    Research on Algorithm of Moving Target Detection in Railway Video Surveillance
    LI Lu,ZHAN Qiang
    . 2015, 28(5):  27. 
    Abstract ( 673 )   PDF (638KB) ( 471 )  
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    The correct detection of moving targets ensures their correct tracking and classification.Thus it becomes an important subject in the study of the video surveillance system.This paper focuses on the research of the moving targets detection algorithm to achieve the recognition of the target ahead along the railway.First,background modeling is carried out on the video sequence through the Gauss mixture model,and together with the hybrid differential algorithm the prospects are extracted and detected.A comparison of the algorithm with the hybrid differential algorithm shows that the algorithm proposed in this paper has certain feasibility.

    Algorithm for Dynamic Data Aggregation and its Simulation
    SU Jiaorao
    . 2015, 28(5):  30. 
    Abstract ( 606 )   PDF (611KB) ( 425 )  
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    The dynamic data distribution algorithm used by the computing data center has the disadvantages of strong limitations,complex formulas,and low algorithm running efficiency.This paper proposes an algorithm for dynamic data aggregation,which is further improved on the basis of the actual situation of the computing data center.Its application in the computing data center is analyzed.Simulation results show that the improved data distribution method based on the dynamic data aggregation algorithm can achieve a data distribution accuracy rate of as high as 98.2%,as compared with the conventional data distribution accuracy rate of 83.6%.

    A Kriging Parameters Optimization Algorithm Based on Gradient Method
    LI Yong
    . 2015, 28(5):  32. 
    Abstract ( 610 )   PDF (626KB) ( 469 )  
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    The key to the construction of the Kriging model is to determine the parameter of the correlation function.To solve the problem of low accuracy of the traditional pattern search method,we propose a method using the projection gradient method to solve the Kriging algorithm of spatial correlation function parameters.For the target function,we also solve the first order gradient about  θ with the value of β  kept constant in stepbystep solution.The outcome of numerical experiments shows that we can obtain more accurate solution by this method.

    Application of J1939 Protocol in ECU Communications
    LIU Ming
    . 2015, 28(5):  36. 
    Abstract ( 522 )   PDF (841KB) ( 546 )  
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    J1939 protocol is a communication protocol widely used in largescale automobiles currently.It is applied to the embedded CANbased networks.This paper mainly expounds the relationship between the CAN and J1939 protocol,focusing on details of the function application in the ECU communication,the communication process and how to organize data packets.It also describes the meaning of the commonly used parameter set and gives examples to explain the communication process.Detailed instructions on how to use the J1939 protocol effectively promote the further development and application of J1939 protocol in the automotive industry.

    Design of an IRIGB Decoder Based on FPGA
    GU Yangyang,FU Daowen
    . 2015, 28(5):  39. 
    Abstract ( 636 )   PDF (787KB) ( 542 )  
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    To solve the problem of low decoding accuracy and poor working stability of an IRIGB decoder based on the single chip microcomputer,this paper describes an IRIGB decoding hardware implementation based on FPGA.In the process of implementation,emphasis is put on analyzing and processing burrs introduced by the IRIGB code signal.The influence on the stability of the system caused by burrs is thoroughly eliminated by the method of three level D flipflop followed by OR gate.This system has the advantages of higher decoding precision,stability and easy implementation.

    Simulation and Hardware Implementation of D/A Conversion in System View Environment
    GU Qiang
    . 2015, 28(5):  43. 
    Abstract ( 440 )   PDF (640KB) ( 439 )  
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    The analog signal is better than the digital signal in the transmission medium,so a digital to analog converter is designed.System View is used to simulate the DAC module.Then the D/A conversion hardware circuit is designed.A frontend parallel/serial conversion circuit is designed,which makes possible D/A conversion of both 8bit parallel digital signals and 8bit serial digital signals.On the output side,an active secondorder lowpass filter circuit is included so the analog output is smoother.Lower waveform attenuation within the practical range is achieved.

    A Robust TwoDimensional Pulsetopulse Canceller of Ground Clutter
    XUE Haiwei,FENG Dazheng,ZHOU Yan
    . 2015, 28(5):  45. 
    Abstract ( 544 )   PDF (904KB) ( 488 )  
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    The twodimensional pulsetopulse canceller (TDPC) of ground clutter can effectively prefilter the clutter along the clutter trace and enhance the moving target's detectability of the following spacetime adaptive processing algorithms.However,the inaccurate radar system parameters,especially the airborne velocity and drift angel,will constrain the TDPC's clutter suppression ability.To solve this problem,a robust twodimensional pulsetopulse canceller (RTDPC) of ground clutter is proposed,in which the errors of the airborne velocity and drift angel are taken as the priori knowledge and added into the design of filtering coefficient matrix.The simulated and MCARM real data are utilized to verify the validity of the proposed method.The experimental results show that the clutter suppression performance of RTDPC can be improved compared with the TDPC under the condition for inaccurate airborne velocity and drift angle.The moving target detectability of following spacetime adaptive processing algorithms is also enhanced after RTDPC is used as a prefilter.

    WANG Danyu,SUN Wanrong,CHENG Long,WEI Xuesong
    WANG Danyu,SUN Wanrong,CHENG Long,WEI Xuesong
    . 2015, 28(5):  50. 
    Abstract ( 505 )   PDF (851KB) ( 504 )  
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    We present a design of a PCII2S audio system based on FPGA.By combining the PCI soft core,FIFO,and the designed interface circuit in FPGA,we implement such buses as PCI,I2C,and I2S in this FPGA system.We also implement the function of audio date transmission and playing by using the stereo audio codec Tlv320aic23b with FPGA.The system makes full use of the resources on FPGA and its characteristic of reprogrammability to reduce the complexity of the hardware circuit design.

    RSD Based Generators for the Pulse of Broken Concrete Crushing Experiment and Simulation
    LI Hongda,LI Xin,Alexander G Lyublinsky,Sergey V Korotkov,ZHAO Hongyang,CHE Long
    . 2015, 28(5):  53. 
    Abstract ( 505 )   PDF (878KB) ( 488 )  
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    This paper summarizes the design principles and scheme of the pulse generator for crushing of concrete.A reverse switching transistor is used for the crushing experiment.The software of CST is used for the simulation of electrode discharging so as to determine the optimum parameters for the pulse generator.The study shows that the output pulse based on the RSD pulse generator can efficiently crush concrete without pollution and is expected to replace the dynamite blasting method.

    An Improved Noise Modeling for Deepsubmicron MOSFETs
    DOU Sasa,GAO Jianjun
    . 2015, 28(5):  57. 
    Abstract ( 522 )   PDF (556KB) ( 447 )  
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    An new noise model based on the smallsignal model is presented.All the noise parameters can be extracted by using the noise correlation matrix together with Pospieszalsik and Pucel models after the smallsignal parameters of the 0.13 μm MOSFET are accurately extracted.A noise model is built through ADS.Within the range of 2~20 GHz the simulation result is in good agreement with the measured result,which verifies the accuracy of the model.

    Design of a Micropower LED Sound Lights Drive Power Based on the Dual Synchronous Chopper Mode
    JIN Yonggao,ZHENG Peimin
    . 2015, 28(5):  60. 
    Abstract ( 514 )   PDF (809KB) ( 448 )  
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    A method to design a micropower LED sound lights drive power supply based on the dual synchronous chopper mode is proposed.This drive power supply controls two switches to provide operating current for the main power and the standby power with a SCM.The main power supply with the fullwave chopping mode provides operating current for the LED lamps;because the standby power uses the halfwave chopper mode,the power consumption is greatly reduced.The structure of the power supply is simple,and can work within 180~250 V at 50~60 Hz.The power supply has the function of constantcurrent driving and the characteristic of micropower.Moreover,the power supply is stable and reliable with good performance and low cost.

    State Machine Control Based Buck Type Switched Capacitor DCDC Converter
    ZOU Zhipeng,BU Gang,ZOU Lu
    . 2015, 28(5):  63. 
    Abstract ( 666 )   PDF (1013KB) ( 487 )  
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    We propose a control means based on the multigain mode conversion based on the state machine control.The system uses the gain hopping technique to switch the mode and the pulse skipping modulation (psm) to change the switching frequency according to the load current and input voltage.Thus,the output voltage will be stable and the system conversion efficiency can be improved.The gain hopping module is automatically controlled by a digital state machine,which is designed and simulated in a CSMC 0.5 μm CMOS process.The result of spectreverilog simulation shows that the state machine can accurately control the switch of three gains and the change of switching frequency.Besides,it could generate the stable output voltage of 1.8 V and attain the expected purpose.

    A Novel Capacitor Trimming RC Oscillator
    WANG Wenlong,HONG Shuliang
    . 2015, 28(5):  68. 
    Abstract ( 548 )   PDF (723KB) ( 513 )  
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    In order to reduce power consumption and improve stability of frequency for RC oscillator,a novel RC oscillator is proposed.It uses a single comparator and trimming capacitor structure.An accurate design and simulation were made based on 0.35 μm BCD process and Hspice.The simulation results show that the normal frequency is 51 kHz.Because of temperature and supply voltage variations,the frequency can change from 47.54 kHz to 53.97 kHz.It consumes 2.1 μA.The final die size is 150 μm×180μm.It has low power consumption and provides a relatively stable frequency.The oscillator is applicable for power management ICs.

    Design of a Wilkinson Power Divider Based on the Nonuniform Transmission Microstrip Line
    ZHANG Yalan,LIU Jiuju
    . 2015, 28(5):  71. 
    Abstract ( 550 )   PDF (585KB) ( 433 )  
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    On the basis of the fundamental theories of the microstrip line,this paper designs a new Wilkinson power divider using the nonuniform transmission microstrip line.The divider is theoretically analyzed by impedance matching and odd and even model analysis.Related data parameters are obtained through the design,simulation and optimization of ADS2008(Advanced Design System 2008),and a Wilkinson power divider based on the nonuniform transmission microstrip line is designed within the range of 3.1~10.6 GHz.Thus a miniaturized Wilkinson power divider with low power dissipation is realized.

    Research on Optimal Power Allocation Strategy for Twoway Amplifyandforward Relay System
    LIU Chunsheng,XU Jiapin
    . 2015, 28(5):  74. 
    Abstract ( 579 )   PDF (531KB) ( 566 )  
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    In order to improve the sumrate of the twoway relay system,this paper proposes an optimal power allocation scheme in Twoway AF relay system which uses the technology of SNR Balancing(SNRBalancingIPA),and the expression of the optimal power allocation is derived.The theoretical analysis and simulation results show that the proposed Optimal Power Allocation scheme can effectively improve the sum rate of the system,thus improving the performance of the system.

    Blind Source Separation Method for MIMO Radar Signal
    FANG Jian
    . 2015, 28(5):  77. 
    Abstract ( 754 )   PDF (862KB) ( 491 )  
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    In view of the characteristics of the MIMO radar signal,a multiangle radar reconnaissance method is adopted in this article.By collecting independent signal samples of the same radar in different directions,Principal Component Analysis(PCA) can be used to estimate the number of signal waveform and Independent Component Analysis(ICA) can be used to isolate all quadrature components of the MIMO radar signal.Finally,in the case of SNR being 0dB,the orthogonal frequency division multiplexinglinear frequency modulation signal is taken as an example for simulation and analysis.Results show that this method is effective.

    Research on Linearization Techniques for Millimeterwave PA
    NIU Haijun
    . 2015, 28(5):  81. 
    Abstract ( 513 )   PDF (904KB) ( 444 )  
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    According to the linearization requirements of millimeter wave PA,antiparallel Schottky diodes are used to design a millimeter wave linearizer.Its basic structure and working principle are introduced.The circuit is optimized and simulated by software.Based on the simulation,the linearizer is applied to a power amplifier.The test results show that the IM3 has been improved by more than 8 dB.The results show that this linearizer has simple structure,and can be easily adjusted.It is of practical valuable.

    Design of a Multifunction Electronic Clock of Infrared Remote Control Based on MCU
    HONG Shuliang,WANG Fuqiang,LIU Junwei
    . 2015, 28(5):  85. 
    Abstract ( 654 )   PDF (504KB) ( 502 )  
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    A clock with AT89C51 MCU as the core and C language modular design as software is designed.It can display year,month,day,hour,minute,second and temperature,and alarm hourly.The basic time adjustment and alarm setting can be done through an infrared remote controller.All information is shown directly through the 1602 dot matrix LCD visual display and controlled through the use of the infrared remote controller for household electric appliances.It is easy to use and therefore has broad market prospects.

    Chaotic Analysis and Control of Fractional Order Buck Converter
    CHEN Wei,SUN Huiming,SUN Longjie
    . 2015, 28(5):  87. 
    Abstract ( 618 )   PDF (1004KB) ( 508 )  
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    Based on the Fractional facts of inductance and capacitance in Matlab/Simulink,this paper establishes a mathematical simulation model of the fractional order Buck converter and the corresponding circuit simulation model.The correctness of the model is verified.Based on the fractional order of the mathematic simulation model,we study the literature researches,which are rare,on the reference voltage as the control variables of the chaos.We also draw the phase diagram and the corresponding bifurcation diagram of the Buck converter variable VI chaos with the reference voltage as the chaos variable.It is shown that a smaller reference voltage is more likely to cause the chaotic state of the Buck converter.Finally the parameter interference method is used to control the chaos.And a new bifurcation diagram is obtained,which constitutes a sharp contrast with the one before the chaos is controlled.By selecting a given reference voltage value and analyzing the time domain waveform diagrams of the induced current before and after the chaos is controlled,the control algorithm is shown to be effective.

    Characteristic of HV Insulators' Leakage Current on Surface Discharge
    XUE Zhaohui,ZHANG Aijun,HE Bo
    . 2015, 28(5):  94. 
    Abstract ( 788 )   PDF (836KB) ( 453 )  
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    The defects limiting the application of the technology and need solving instantly are that the results are always inexact and have higher false alarm rate in HV contaminated insulators flashover prediction at present.In this paper,the relationship between the surface discharge state and four indexes of leakage current envelope as mean,std,skewness,kurtosis are studied.Through synthesizing the four indexes,the new indexes were developed,which are more suitable for evaluating the flashover risk with lower false alarm rate.

    Strategy for Reducing Starting Current for Direct Torque Control Induction Motors
    LI Zhengxue
    . 2015, 28(5):  98. 
    Abstract ( 540 )   PDF (623KB) ( 494 )  
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    In order to solve the problem of high starting current of direct torque control (DTC) systems for induction motors,this paper proposes applying the DC preexcitation technology to DTC,which means a switch between a zero voltage vector and a fixed active vector.When the current exceeds the set value the system will be switched to the zero voltage vector.Simulation and experimental results show that the new DTC strategy effectively reduces the startup current,increases the startup torque,and improves the performance of the DTC.

    Design of a Motor Control System Based on Infineon XC2267
    YIN Gang,HAO Runke,HUANG Wei,LUAN Jian
    . 2015, 28(5):  101. 
    Abstract ( 721 )   PDF (741KB) ( 612 )  
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    In the study of electric vehicles,the design of the drive motor and control system is particularly important.In this article,a control system is designed for the electric vehicle permanent magnet synchronous motor field oriented vector based on Infineon's 16-bit microcontroller chip XC2267.Part of the control system hardware circuit is designed.A simulation model for the motor control system is established in the Simulink simulation environment.Simulation results show that the system design is feasible,the motor runs fast with quick response and good stability,and is of practical significance for the permanent magnet synchronous motor control system.

    Simulation Design of Line Scanning AFC PLL Circuit Based on Multisim
    LI Hongen
    . 2015, 28(5):  105. 
    Abstract ( 670 )   PDF (612KB) ( 502 )  
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    The phaselocked loop(PLL) circuit has extensive applications in various electronic devices.It can control the phase error and implement frequency synchronism between the input signal and output signal.To design a line scanning AFC PLL circuit,Multisim2001,which is powerful in circuit design and simulation,is used.Simulation results show that the circuit designed has the function of phase locking.And because of the simple and flexible simulation environment of Multisim,the optimal phase locking range can be obtained by changing the parameters of the devices and observing the changes in waveform of each point,thus saving cost for PCB design and manufacturing.

    Synthesis and Characterization of CuSn Nanoparticles
    HAN Mengxu,PAN Zhilong
    . 2015, 28(5):  108. 
    Abstract ( 490 )   PDF (644KB) ( 478 )  
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    CuSn nanoparticles are prepared by chemical reduction method,whose sizes and thermal properties are studied.The Xray diffraction analysis results of the product show that the product is constituted primarily by Sn nanoparticles and CuSn nanoparticles (Cu6Sn5),and that the nanoparticles are not oxidized.The differential scanning calorimetry results of CuSn nanoparticles show that the melting point of nanoparticles is 202.98 ℃,very suitable for the low melting point electronic packaging material required by the modern packaging technology.

    Impact of Power on the Preparation of βFeSi2 Films
    HU Weiqian,ZHANG Jinmin,SHAO Fei,LU Shunshun,HE Xiaojin,XIE Quan
    . 2015, 28(5):  111. 
    Abstract ( 578 )   PDF (964KB) ( 440 )  
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    The magnetron sputtering method with the sputtering chamber backing vacuum better than 2.0 × 10-5 Pa,is used.A layer of Fe film(150 nm~330 nm) is deposited on the substrate of the Si(100) (electrical resistivity of 7~13 Ωcm) at different powers.Then at 900 ℃,it is annealed for 15 hours with the backing being vacuum(4 × 10-4 Pa) to form a βFeSi2.The scanning electron microscopy(SEM) is used to characterize its surface morphology structure.The Xray diffraction(XRD) is used to analyze its crystal structure.When the sputtering power is 70~100 W,the main diffraction peak is derived from βFeSi2,but at 2θ=45 °a relatively large FeSi large peak appears,and a larger Fe5Si3 peak appears in the vicinity of 2θ=38 °.The results show that the best preparation for the βFeSi2 film is annealing at 900 ℃ for 15 hours with a sputtering power of 110 W.

    Application of PVMPPT Control Based on PSOBFO Algorithm
    LIU Rui,JIAN Xianzhong,QIAN Shuangjie
    . 2015, 28(5):  114. 
    Abstract ( 608 )   PDF (740KB) ( 467 )  
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    Under the condition of uneven illumination,many extreme value points will appear on the photovoltaic array PV curve.The traditional algorithm may suffer from local optimization and become invalid.In this paper,the particle swarmbacterial foraging algorithm is put forward,which combines the particle swarm optimization (pso) algorithm and the bacterial foraging algorithm.The particle swarm algorithm is used for global search and then the particles are seen as bacteria and the bacterial foraging algorithm is used for local search.Simulation results show that the algorithm is accurate and fast in multipeak conditions.

    Key Technology for a Real Time Traffic System Based on the Mobile Internet
    XIE Yunhong,ZHANG Jumei,XIANG Yang
    . 2015, 28(5):  118. 
    Abstract ( 711 )   PDF (678KB) ( 561 )  
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    The real time traffic information acquisition and distribution system based on the Mobile Internet is composed of three parts,the client software running on the smart mobile phone terminal,the  realtime traffic server on the Internet and the query client software running on the smart mobile phone terminal.The system acquires traffic information about the location,speed and direction of those in traffic using GPS,AGPS and GPS data security technology,and processes data by data mining and GIS map matching etc,and releases data using Web GIS and dynamic path planning.Urban traffic problems can be found using data offered by the MIRTTS system,on the basis of which we propose a professional solution to traffic problems,thus alleviating urban traffic congestion,saving resources and reducing motor pollution emission.

    Design and Realization of TPC Coding Based on FPGA
    LI Chao
    . 2015, 28(5):  121. 
    Abstract ( 712 )   PDF (587KB) ( 499 )  
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    This paper introduces the principle of encoding and decoding on Turbo Product Code (TPC),and analyzes the structure of TPC coding.Taking Subcode (64,57,4) extended Hamming code in Gauss channel,this paper presents the performance of signal to noise ratio,and introduces the design of the module for TPC coding.Finally the Altera EP2S180 chip is used to verify the scheme.Results show that when the system clock is 100 MHz,the decoding delay is approximately 44 μs,which can meet the requirement of realtimeness.

    Chest Bone Segmentation Based on Wavelet Transform and Massive Training Artificial Neural Network
    CHEN Sheng,QU Xinbo
    . 2015, 28(5):  124. 
    Abstract ( 591 )   PDF (921KB) ( 410 )  
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    A large number of lung nodules are missed by radiologists because they are hidden behind ribs or clavicles in chest radiographs.The purpose of this study is to separate the bony structure,such as ribs and clavicles from soft tissue in CXRs.To achieve this goal,we developed a multiresolution massive training artificial neural network based on the wavelet transform.By this method,the visibility of nodules and lung vessels are guaranteed.And the separation of bones from the soft tissue would be potentially useful for radiologists in the detection of lung nodules.

    Hand Gesture Recognition Based on Multifeature Fusion and Support Vector Machines
    WU Jianjian,CHEN Wei
    . 2015, 28(5):  127. 
    Abstract ( 807 )   PDF (851KB) ( 951 )  
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    Hand gesture features are easily affected by environmental factors and the gesture recognition rate is therefore low.And single features are much limited.This paper presents a novel hand gesture recognition algorithm based on multifeature fusion and support vector machines.The fusion features include HOG features and Hu moments.First,the gesture image is set to extract the local HOG features.Then Hu moments are extracted from the gesture contour.After that,the dimensions of the fusion features of HOG and Hu moments are reduced by using Principal Component Analysis (PCA).Finally,the fusion features are put into support vector machines for identification.The experimental results show that the method proposed has better robustness and a higher recognition rate.

    Research on Block Image Segmentation Based on the Neural Network
    ZHANG Guoguang
    . 2015, 28(5):  132. 
    Abstract ( 709 )   PDF (1108KB) ( 447 )  
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    The human face,the most dominant feature of human beings,is unique.The key to human face recognition is the segmentation and calculation of the human face.The traditional human face segmentation can not extract the complete face information when there is blocking,resulting in missing information and disabling image detection.The algorithm proposed in this paper is based on neural network the adaptive technology,and can even segment and calculate the blocked part of the face.After simulation and calculation of several images,the blocked image can be segmented effectively,so that 85% of the human face can be segmented,as compared with the segmentation rate of 78% by the traditional algorithm.Therefore,this algorithm is of practical value in the image recognition field.

    Research on Regular Picture Fragments Reassembly Based on Genetic Algorithm and 01 Programming
    HAN Yingying,ZHANG Yipeng,SHEN Hongping,WANG Yikang
    . 2015, 28(5):  136. 
    Abstract ( 515 )   PDF (919KB) ( 448 )  
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    By preprocessing the regular picture fragments,extracting the boundary pixel feature of picture fragments,setting reassembly target of the overall maximum compatibility,the regular picture fragments recuperative model is built based on 01 programming.Considering the complexity of the model and the applicability of the solution to the complicated model,the genetic algorithm (GA) can be used to solve the 01 programming reassembly model.The results show that the regular picture fragments reassembly model based on 01 programming can accurately describe the recuperative procedure with a mathematical language,and GA can be used to reassemble the fragments.

    A Unified User Management and Authentication and Authorization Scheme
    ZHANG Zhen,ZHU Zhixiang,LIANG Xiaojiang
    . 2015, 28(5):  140. 
    Abstract ( 711 )   PDF (970KB) ( 481 )  
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    In order to improve the efficiency of the user management and authentication and authorization of the system of multiapplication service,this paper proposes a method that separates the user management from the application and integrates into a unified user management system to achieve singlepoint authentication and authorization.The unified user management system manages the application information and the user information of the application,and the singlepoint authentication system is responsible for all authentication and authorization,with inmemory database and database jointly used to separate user data reading and writing.The user management module is used to acquire and control user authorization.The program effectively improves the user management efficiency,and greatly increases the load capacity and response speed of the system.

     Software Design of Universal Monitoring System in the Internet of Things
    WANG Leilei,SUN Wanrong,WEI Xuesong,ZHANG Xiaxia,LI Peijia
    . 2015, 28(5):  143. 
    Abstract ( 686 )   PDF (942KB) ( 420 )  
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    In this paper,we present a universal monitoring software system for the internet of things in different fields.The software needs hardware equipment with up to 40 external interfaces.As long as the sensors meet this standard connection interface,they could sample data only if the upper software page is modified.This system facilitates adding or deleting sensors,which dramatically increases the system's scalability.The system is based on B/S mode.A Struts2+Spring+hibernate framework is used to build a Web platform,which can complete the addition,deletion and change of applications and equipment,listing of sensor data,and display of the curve.The overall objective of the system,together with its main function and implementation,is given.

    Design of a Multifunctional Windows Control System
    LAI Tianhao,CHEN Senlin
    . 2015, 28(5):  147. 
    Abstract ( 582 )   PDF (623KB) ( 428 )  
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    The traditional windows have no intelligent function.The paper designs a multifunctional control system which can switch the window automatically according to various parameters based on STC89C52 MCU.Through the design of hardware and software programming,such functions as timing,light control,rain and smoke resistance,antitheft,and remote control can be realized.Simulation of the system in the laboratory environment(with temperature being 15 ℃and humidity being 30%) shows that the designed system can attain the expected goal.

    Research on and Implementation of Archive Electronic Directory Retrieval Software Based on VBA Language
    TENG Mange
    . 2015, 28(5):  150. 
    Abstract ( 548 )   PDF (895KB) ( 425 )  
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    On the basis of an analysis of the requirement for archive electronic directory retrieval,the author compiled an archive electronic directory retrieval software based on VBA language,In the process,the author solved such key problems as retrieval of archives in different years,complex conditions retrieval,humancomputer interaction,and the expandability of the software.This software solves the practical problems in retrieval and is,therefore,of practical value.

    Research on Optimization Method for the PMSM Servo Control System
    MA Lixin,XU Zhenqian,FAN Hongcheng,LI Guangyao
    . 2015, 28(5):  154. 
    Abstract ( 640 )   PDF (802KB) ( 474 )  
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    The permanent magnet synchronous motor has the features of strong coupling and nonlinearity.Its application environment is complex and there is interference,which gives rise to poor system stability.The traditional PI control method has difficulty meeting the requirement of the control system,and the control is therefore poor.To suppress overshoot and improve the control accuracy,a new particle swarm optimization (pso) algorithm is proposed in this paper.With system precision as the optimization objective of particles and the optimal particle as the PI parameter,the precision and stabilization of the Servo Control System can be controlled.Simulation results show that the particle swarm algorithm of the PI controller enables this system to have better dynamic and static performance.The study provides a strong theoretical support for the servo control system optimization design which has promising application prospects.

    File Storage System Design Based on Flash Memory Chips
    PENG Tao
    . 2015, 28(5):  158. 
    Abstract ( 574 )   PDF (690KB) ( 412 )  
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    The paper achieves the file storage system using Xilinx's Airtex7 series FPGA chip as master chip.The file storage system can implement plug and play and automatic identification of the operating mode.It is capable of file storage,downloading and deletion,and formatting.This system can be used as the backend file storage/download implementations for any data acquisition system and has great versatility.

    The Foreign Development of Missile Data Link System
    ZHOU Lei
    . 2015, 28(5):  161. 
    Abstract ( 630 )   PDF (713KB) ( 531 )  
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    Following the development of precision guided munition,it received widely attention until recently years to start the development inland,the US army had brought a weapons data link into their data link system as early as 1980s,substantially promoted the battle killability.The foreign development of missile data link system is studied in this paper,especially focused on the USA development,learning from the US army experience.And then,the direction of development of the missile data link system is introduced.

    Research Status of the Paradigms for the P300based BCI System
    LI Qi,LIU Shuai,SHI Kaiyang,CAO Kai
    . 2015, 28(5):  164. 
    Abstract ( 815 )   PDF (851KB) ( 467 )  
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    The braincomputer interface system is a communication system through which information can be exchanged with the outside world to express ideas without the aid of peripheral nerves and muscles.In the past 20 years,P300 potential has been attracting much attention as a typical potential of the braincomputer interface system.Many researchers have proposed different paradigms for the P300based braincomputer interface system to improve the performance of the braincomputer interface system.On the basis of summary and induction,three kinds of widely used paradigms with superior performance are discussed in detail,and their performance are compared and summarized.In addition,the physical properties influencing the paradigms are analyzed.Finally,an overview of the trend of future braincomputer interface paradigms development is discussed.

    Development Trend of the Tactical Data Link of the Foreign Military
    ZHANG Shixiang,GU lei
    . 2015, 28(5):  169. 
    Abstract ( 726 )   PDF (613KB) ( 597 )  
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    Tactical data link is a critical factor in improving systematic capability of the military in joint operations.This paper introduces the current status of US and NATO military tactical data link,Link4,Link11,and Link16 with emphasis on the development trend of the unified message standard,dynamic network management,common link integration processing and universal transformation of tactical data link.It also presents suggestions for the development of our tactical data link.

    Research Progress of Thermoelectric Materials
    ZHOU Qiang,LIANG Bei,ZOU Sifeng,HE Yuanying
    . 2015, 28(5):  172. 
    Abstract ( 684 )   PDF (1180KB) ( 584 )  
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    With the development of thermoelectric materials and the synthesis techniques of thin film,thermoelectric thin films and low dimensional structures have caught the attention of researchers due to their promising thermoelectric performance.Recent research in this field focuses mainly on improving the energy conversion efficiency of thermoelectric materials.This review gives an introduction to the theoretical background and classification of thermoelectric materials.Then,the preparation methods and characterizations of the thermoelectric properties are based on Bi2Te3based materials.Finally,the future research interests and potential development of the thermoelectric materials are proposed.

    College Sports Network Teaching and Management Model
    SONG Baojie
    . 2015, 28(5):  179. 
    Abstract ( 480 )   PDF (615KB) ( 402 )  
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    This paper analyzes the composition and evaluation system for the university physical education network teaching system,discusses the changes in content and methods of physical education teaching brought by the network.It also analyzes the management mode of university physical education in the network and information age and present the convenience the network has brought to physical education curriculum management.

    Implementation Strategies for Code Reuse in Objectoriented Software Development
    ZHAO Yan
    . 2015, 28(5):  181. 
    Abstract ( 570 )   PDF (542KB) ( 501 )  
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    Code reuse can speed up the process of software development,reduce the cost of software development and maintenance,and can improve the quality of software products to a certain extent.To improve the reuse ability in objectoriented software development,this paper analyzes there implementation strategies of code reuse,and proposes some issues to be noted in the process of reuse.

    Performance Optimization of Web FrontEnd Engineering
    LI Xiaofeng
    . 2015, 28(5):  184. 
    Abstract ( 550 )   PDF (623KB) ( 470 )  
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    Successful web applications,in most cases,depends on their performance.How to improve web performance has become a common research interest of related industries.In order to improve the web programming performance,this paper discusses the optimizations of the factors affecting the web frontend performance without changing the background data structure and original websites from two aspects,HTTP optimization and web elements optimization.

    Digital Transformation Plan of Analog Microwave
    Transmission Systems for Digital TV
    WANG Renlei
    . 2015, 28(5):  187. 
    Abstract ( 543 )   PDF (617KB) ( 407 )  
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    This paper analyzes the use of microwave transmission for digital TV.By indicators for the digital transformation plan,the transformed microwave transmission system can have the BER ≤10-6 and the digital signal level reserve>20 dB,which guarantees the stability of the image quality and broadcast transmission.Digital microwave transmission of digital television signals effectively eliminates the problems in analog transmission and also has the advantage inherent in microwave of strong resistance to natural disasters and easy maintenance.

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