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Table of Content

15 December 2012 Volume 25 Issue 12
  
    Articles
    An Identity-Based Threshold Signature Without Trust Party
    JIAO Dan-Dan, WANG Bao-Cang
    . 2012, 25(12):  1. 
    Abstract ( 825 )   PDF (497KB) ( 936 )  
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    A new threshold signature without trust party is proposed from the bilinear parings based on a new identity-based signature scheme.The proposed threshold signature scheme needs an interactive protocol among participants in the key generation.It solves the problem of key escrow.It is shown that the signature scheme is secure with good robustness and unforgeability.

    Digital Image Watermarking Based on Chaos Encryption and the Adaptive Wavelet
    ZHANG Mao, YU Xiao-Qing
    . 2012, 25(12):  4. 
    Abstract ( 966 )   PDF (626KB) ( 758 )  
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    Most wavelet-based digital watermarking algorithms determine whether to embed the watermark according to the magnitude of the wavelet coefficients in low frequency,but this kind of schemes is not good at imperceptibility for the watermarking in the image.In view of the question,an image watermarking algorithm based on chaos encryption and the adaptive wavelet is proposed in this paper.Disordered watermarking by chaos and the m series are adopted to look for texture area of the host image by HVS,and to insert the watermarking into the high frequency coefficient of the adaptive wavelet of texture area.The experimental results show that the algorithm not only increases security of the watermarking,but is also better in robust and invisibility on implementing the watermarking.

    Natural Gradient ICA Algorithm Based on Adaptive Step-size and Weighted Orthogonal Constraint
    TANG Xin-Jia, ZHANG Xiu-Fang
    . 2012, 25(12):  7. 
    Abstract ( 841 )   PDF (604KB) ( 779 )  
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    For the instability of the traditional natural gradient ICA algorithm and the inaccuracy of separation results,a natural gradient ICA algorithm combining adaptive step-size and weighted orthogonal constraint is put forward.Firstly,based on the orthogonal constraint of separation matrix,a single-step orthogonal correction method is introduced.Then,because the difference of adjacent iteration results can be used to construct smoothly the distance from iteration result to optimal value,a single-step error estimation function is proposed.Finally,according to this error estimation function,an adaptive step-size is raised.Simulation experiments show that the rate of convergence of natural gradient ICA algorithm combining adaptive step-size and weighted orthogonal constraint is higher than that of the traditional natural gradient ICA algorithm,and at the same time the stability of the algorithm and the accuracy of the separation results have been improved greatly.

    Research on and Design of Wireless Sensor Network Gateway Based on 6LoWPAN
    ZHANG Xiao-Kui, BAI En-Jian
    . 2012, 25(12):  11. 
    Abstract ( 959 )   PDF (751KB) ( 785 )  
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    IPv6 is combined with low power consumption wireless personal area network based on IEEE 802.15.4 to build 6LoWPAN network which meets the future development of the internet of things and has far-reaching significance.In this paper,we propose a gateway solution for wireless sensor network based on 6LoWPAN,which can realize the wireless sensor network based on 6LoWPAN and IPv6 network interconnection.In addition,we relate and analyze the hardware and software design of the gateway.Finally,we set up a test network,and test the connectivity of the end-to-end network,change of the delay,round trip times,packets loss rate,and the throughput of the packets.Then we make briefly performance analysis of the network.The experiment shows that the gateway can realize the wireless sensor network based on 6LoWPAN and IPv6 network interconnection,and it can run in actual network environment.

    Dual-band Ranging Method
    MA Xiong-Yan, ZHANG Guan-Wu, TONG Fei
    . 2012, 25(12):  15. 
    Abstract ( 1051 )   PDF (463KB) ( 801 )  
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    A Continuous wave Very short-range Ranging system is built.The theory of dual-band ranging method is discussed.A Simulation over high speed short range target ranging is given,in which Ranging accuracy and Velocimetry accuracy are discussed.An improved method is proposed finally.

    Park Road Design Based on the Genetic Algorithm
    ZHANG Hai-Bo, FENG Hai-Lin, CHEN Ying
    . 2012, 25(12):  18. 
    Abstract ( 1156 )   PDF (514KB) ( 837 )  
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    A design scheme of city park road on two specific problems is proposed in this paper.Based on the idea of genetic algorithm and its improvement,this scheme selects the park road overall length as the objective function and chooses a reasonable iterations and the probability of mutation to propose better solutions under different restrained conditions.The complexity and calculated load are greatly reduced.This design scheme solves effectively the complex problems which are difficult to solve by traditional scheme.Finally,the improvement of this algorithm and the further promotion of the algorithm applied are introduced.

    Evaluation of the Basic Efficiency of ESJ by ADC Method
    CHEN Xiao-Rong, LI Yan-Zhi, LU Jian-Hua
    . 2012, 25(12):  21. 
    Abstract ( 886 )   PDF (642KB) ( 766 )  
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    This paper,based on ADC method for evaluation model,estimates the basic efficiency of ESJ effectively,and verifies the model.Furthermore,this paper analyses the influencing factors of the interference ESJ efficiency,offering the theoretical foundation for the research into the operational effectiveness of ESJ.

    Dithering Algorithm Based on Error Diffusion
    XIA Yu, WANG YA-Xiong
    . 2012, 25(12):  24. 
    Abstract ( 825 )   PDF (948KB) ( 903 )  
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    This paper focuses on the use of matlab serpentine path with dynamic threshold based on error diffusion dithering algorithm and its improved peak signal-to-noise ratio.The peak signal-to-noise ratio is used as the major indicator to evaluate the image.A dynamic threshold is better in signal-to-noise ratio than a fixed threshold,and it can be inferred that an appropriate dynamic threshold selection method can obtain optimal dynamic threshold.Experiment shows that our algorithm evaluates the image noise and blurring better,and in some cases can optimize the image.

    Simulation Analysis of the Distribution Network Fault Location System Based on Phase Method
    ZHANG Xin, LI Bao-Lan, WEN Zheng-Yang
    . 2012, 25(12):  27. 
    Abstract ( 1251 )   PDF (763KB) ( 796 )  
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    The fault section of a distribution network can be judged by the zero sequence current phase fault location.The article uses the simulation module in Matlab/Simulink to simulate the non-ground neutral system.It introduces the building of the simulation model,then simulates and analyses the ground fault in different conditions such as changing the size of the grounding resistance and the length of the line,and with or without load.The simulation results agree with the theoretical one,thus laying the basis for practical applications.

    Design of Typical Applications in Digital Campus Management Based on RFID Technology of Internet of Things
    WANG Chun-Hong
    . 2012, 25(12):  30. 
    Abstract ( 1136 )   PDF (978KB) ( 798 )  
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    The development of IT technology and communication technology has pulled the internet of things topics presented.Development of RFID technology as the core of the "internet of things" has become a new trend.Through research,success stories of the internet of things,in-depth understanding study design the typical application of RFID technology in the management of digital campus.Extensive application of the internet of things products will help the digital management and rapid development,has improved the efficient management of digital campus.

    An Improved Wireless Sensor Network Node Positioning Technology
    MA Jue
    . 2012, 25(12):  34. 
    Abstract ( 1019 )   PDF (564KB) ( 742 )  
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    Wireless sensor network node localization is crucial,and has wide application prospects in military and civilian areas.This article proposes an improvement to the traditional network localization algorithm.The experimental results show that the improved algorithm can efficiently achieve node positioning and effectively reduce error rate.

    Base on Gaussian Random Ballistic Trajectory Simulation
    LIU Hong-Yi, XIAO Yu
    . 2012, 25(12):  37. 
    Abstract ( 816 )   PDF (538KB) ( 749 )  
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    It is quite simple and efficient to create Gaussian random by using the Center ultimate theory.By means of combining the even randomicity and Gaussian random in polar coordinates to simulate ballistic trajectory,create Gaussian distribution.This is actually in accordance with the natural distribution pattern of the real impact points.What's more,a great number of physic system and characteristic,which have normal school character,can be modeled by using Gaussian Random.

    A Novel Algorithm for Image De-noise Based on Median Filter and Wavelet Transform
    ZHANG Hao-Hui
    . 2012, 25(12):  40. 
    Abstract ( 1256 )   PDF (563KB) ( 714 )  
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    The de-noising method by threshold based on wavelet transform is only used to remove Gaussian White Noise and invalid to remove impulse noise.This paper proposes a de-noising method that combines wavelet transform based on novel threshold function and improved median filter.This method can effectively remove fixed noises of the Gaussian White Noise and impulse noise.The simulation experiment shows that combined algorithm for de-noising images of the Peak Signal-Noise Ratio and mean square error is improved over the single algorithm,and the validity of this algorithm is proved.

    The Relationship of the Magnetic Flux Through Two Coils in Parallel
    LI Cun-Zhi
    . 2012, 25(12):  42. 
    Abstract ( 837 )   PDF (386KB) ( 818 )  
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    The relationship of the magnetic flux through two ideal coils in parallel is studied by means of Faraday's law of electromagnetic induction.The conclusion is that the magnetic flux through one of the two coils in parallel is equal to each other.

    Design of the Mountain Power Line Carrier Communication System Based on SC1128
    FAN Yu-Feng, QIN Yuan-Nian
    . 2012, 25(12):  44. 
    Abstract ( 1245 )   PDF (657KB) ( 1002 )  
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    Power line carrier communication is the use of existing power lines as a medium of information transmission method of communication.A power line carrier communication system for the mountainous regions is designed.The system uses a SC1128 chip for signal modulation and demodulation,and the communication network composed of two or more SC1128 module achieves a variety of data and control signal transmission.

    Design of Microstrip Hairpin Bandpass Filter
    YUAN Yu-Xian, SUN Guo-Quan, ZHONG Xian-Feng
    . 2012, 25(12):  46. 
    Abstract ( 1307 )   PDF (733KB) ( 735 )  
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    Mathematical models are established according to the basic theory of lowpass filter prototype,and the microstrip hairpin bandpass filter of seventh order in the X-band is designed using the serenade software,with a central frequency of 11 GHz and bandwidth of 800 MHz.The got-up microstrip circuit is tested,and the testing results show that the filter meets the demand of design.

    Design and Implementation of the Mass Data Fast Transmission Module Between Nios II and FPGA Based on DMA
    YANG Li-Cheng, LIU Dan-Feng, SHI Ji-Hui
    . 2012, 25(12):  49. 
    Abstract ( 878 )   PDF (799KB) ( 696 )  
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    In view of the fact that DMA module can not read/write FPGA peripherals directly in SOPC solutions of Altera company,this paper puts forward the design of general DMA read/write control module based on the transmission mode of Avalon bus flow.The design of two custom peripherals makes it possible for DMA to access High-speed data of FPGA peripherals.It implements rapid transmission of bulk data between the Nios II and FPGA.The paper briefly introduces the Avalon-MM bus norms,and elaborates the design of system architecture and read controller of DMA.Finally the test results show that the solution is efficient and feasible.

    Design of Pulse Fiber Laser Power Control System Based on FPGA
    ZHOU Jian, ZHU Lian-Qing, ZHANG Yin-Min
    . 2012, 25(12):  52. 
    Abstract ( 1064 )   PDF (897KB) ( 984 )  
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    Pulse fiber laser control system in the application of laser marking is studied in detail.An experimental system is designed and tested based on the working and composition principles of pulse fiber laser control system.The function of timing control,laser power control,acousto-optic modulator (AOM) and etc.are implemented using an FPGA processor.Experiment results prove that the system design features simple structure,high integration,high-speed processing,and implements real-time accurate laser power control.

    Simulation Analysis of the Radiation Pattern of the PIFA Mobile Phone Antenna and the SAR Distribution in Human Head
    YU Li-Juan, LI Jian-Jun, LIU Xuan, DU Wen-Quan
    . 2012, 25(12):  56. 
    Abstract ( 1123 )   PDF (847KB) ( 739 )  
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    The EM properties of planar inverted F-shaped antenna (PIFA) are analyzed with the help of the software——High frequency structure simulator (HFSS) in this paper,and then,in order to improve the performance of the antenna,a metal shielding plate is introduced into the model structure.We also propose the changes of the new style antenna.Simulation of the electric field in the head of human beings and the SAR radiation pattern shows that the radiation and the distribution of SAR are reduced significantly.

    Radar Netting and the Analysis of the “Four-Counter” Capability
    ZENG Hai-Bing, XIE Yong-Liang, ZHAO Peng-Liang
    . 2012, 25(12):  59. 
    Abstract ( 1153 )   PDF (524KB) ( 750 )  
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    With the development of systematic integration of modern warfare and the four major threats facing the radar,radar network becomes a current research focus.This paper introduces the concept and characteristics of radar networking,analyses its ability in anti-jamming,anti-stealth targets,anti-radiation missiles and anti-low-altitude target invasion.Studies show that the radar network can effectively achieve the radar “anti” to form a three-dimensional,all-round,multi-level prevention and control system.Combing the characteristics of the single radar network with its overall combat effectiveness,the radar netting is the future trend of the radar technology.

    FPGA-based Design of Temperature Controller
    ZHANG Hui, GUO Yu-Hui
    . 2012, 25(12):  62. 
    Abstract ( 964 )   PDF (733KB) ( 717 )  
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    This paper introduces a temperature control system design based on FPGA.The emergence of programmable device (FPGA) makes digital circuit design fast and easy.The system adopts FPGA as the core controller for programming.A modular design is used to integrate four modules (temperature detection,keyboard input,temperature display and control) into one system to fulfill temperature control.

    Design of a Reconfigurable Laboratory Signal Source Based on FPGA
    LONG Fen
    . 2012, 25(12):  66. 
    Abstract ( 777 )   PDF (510KB) ( 709 )  
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    This article describes the basic operating principle of the signal generator and the design process based on the direct frequency synthesis technology DDS.With MCU and FPGA as the core of the design,we implement a source generator which can adjust the waveform,the frequency and the amplitude.Simulation results show that the proposed generator achieves desirable results and meets the design requirements.

    Design of the Current Controlled Differential Voltage Current Conveyor and its Applications
    ZHAO Yi
    . 2012, 25(12):  69. 
    Abstract ( 807 )   PDF (714KB) ( 726 )  
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    A current controlled differential voltage current conveyor (CCDVCC) is introduced in this paper.Compared with the conventional topologies,the proposed CCDVCC has the advantage of low voltage and low power.In addition,due to the rail to rail structure,its input voltage range is expanded.The absence of PMOS transistors for handling ac signals also improves its performance in bandwidth.

    Design of a Window Opener Controller Based on STC15F104E
    SHA Chun-Fang
    . 2012, 25(12):  73. 
    Abstract ( 980 )   PDF (426KB) ( 788 )  
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    In view of the demand of average families,the paper presents a window opener controller based on stc15f104E,describes the system components and the function of each modules.The system software programming is discussed,and the hardware circuit diagram is presented.Practical test shows that the proposed controller functions well with high reliability.

    Design of Multi-function Remote Control
    WANG Xin, PENG Jian-Hua
    . 2012, 25(12):  76. 
    Abstract ( 837 )   PDF (610KB) ( 696 )  
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    The decimal counter / divider CD4017 and the four-way analog switch CD4066 have wide applications in electronics.This paper introduces a remote control with 10 control functions using CD4017 integrated counting/splitter and 4-way analog switch to facilitate the disabled to manipulate the remote control,etc.,so that the disabled can also enjoy the convenience in their watching television program.

    Design of the Motor Speed Monitoring System Based on LabVIEW
    LI Hai-Chun, CAI Yan, JIANG Wen-Tao
    . 2012, 25(12):  80. 
    Abstract ( 1236 )   PDF (823KB) ( 752 )  
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    Speed is of vital importance in the motor control system.And the precision,real-time and stability of motor speed measurement directly influence the motor speed control system performance.This paper introduces a design of speed monitoring system based on LabVIEW,which chooses absolute optical encoder and single chip microcomputer as front-end speed signal acquisition system,and transmits the data to the PC through RS-232 serial communication.The acquired speed signal is real-timely processed,displayed and stored by using powerful functions of data processing and displaying of LabVIEW.This design has been tested in switched reluctance motor speed control system.Experimental results verify that this method features good human-machine interface,wide range speed measurement,high accuracy,fast response and strong anti-interference ability.

    Application of the Lightning Protection Technology of Power System Telecommunications
    ZHONG Ying-Yi, CAI Xiao-Ming, CHEN Zu-Ban
    . 2012, 25(12):  83. 
    Abstract ( 967 )   PDF (609KB) ( 689 )  
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    In view of the direct threat of lightning on the stable operation of the power grid,especially in the southeast coast in China,this article discusses some easily overlooked details about Anti-lightning of communication system of transformer substation,and the measures of lightning protection for the communication failure with case are discussed,which prove very effective in practice.

    Design of a Cable Anti-theft System Based on the Street Light Compensation Capacitor
    WANG Min, LIU Kai, HUANG Bai
    . 2012, 25(12):  86. 
    Abstract ( 908 )   PDF (649KB) ( 667 )  
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    A new design of guarding against burglary of electric cables based on monitoring the variety of capacitance of the lamps on the road is introduced in this paper.Nowadays the lamps on the road usually have large compensated capacitance,so the capacitance of the cable will change with the length of the cable.The new system is based on the rule above to measure the capacitance to find the exact position where the stealing happened by the use of the single chip AT89C51.Voice chip ISD25120 & dialing chip MT8888 are used to give an alarm on the telephone line automatically.

    Design of Automobile's Rearview Mirror Control Module Based on LIN
    LV Chun-Hao, GUO Li-Jin, CHEN Dong-Xu
    . 2012, 25(12):  90. 
    Abstract ( 1277 )   PDF (662KB) ( 737 )  
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    A rearview mirror module based on LIN BUS with MC9S12DG128 as master and MM908E622 as slave is designed by SMMS (Single Master Multi Slave).The master realizes data transmission/reception by LIN transceiver MC33661 and changes the signal of touched screen into LIN dictate to control the whole rearview mirror module.The slave with a built-in LIN transceiver and motor driver circuit has excellent control,and is suitable for the high-end rearview mirror.This design enhances the intelligent and networked Automobile with practical value in the automobile industry.

    Design of an Anti-Trap Electric Window System Based on LIN
    CHEN Dong-Xu, XIONG Hui, YANG Xue, YOU Yi-Ming
    . 2012, 25(12):  93. 
    Abstract ( 925 )   PDF (728KB) ( 704 )  
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    In order to achieve the safety and rapid response requirements of the electric windows,the electric window anti-trap system based on LIN bus using signal detection technology is designed.The real time positions of the windows are detected by the Holzer sensor,and the system uses the changes in current of the DC motor to determine the obstacle with the Freescale's MM912F634 as the controller.The platform is connected by a LIN bus.The experimental results show that the system can effectively detect the obstacle,and respond quickly to the anti-trap.The system is stable,reliable,fast in operation and low in cost.It also has strong anti-interference ability and great potential on the market.

    Design and Implementation of Large Anti-Collision Mobile Communication Equipment for Military Vehicles
    LI Guo-Zhong
    . 2012, 25(12):  96. 
    Abstract ( 723 )   PDF (673KB) ( 716 )  
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    In view of the defects in communication security and data transmission/reception of the domestic mobile communication equipment for military vehicles,this article proposes the design and implementation of a new generation of anti-collision large military vehicles and mobile communication equipment.Based on embedded systems,the system hardware design offers good anti-interference ability,and efficient software drivers are developed to ensure the normal operation of military vehicle communication system.Simulation test shows that the design of the hardware and software can are compatible with each other,and realize various functions with good results.

    Software Design for theWireless Remote ECG Monitoring System
    SHI Min-Min, HE Xue-Hong
    . 2012, 25(12):  100. 
    Abstract ( 869 )   PDF (865KB) ( 856 )  
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    Heart diseases often happen suddenly and are with high fatality.In order to detect the illness in time,one needs to conduct effective monitoring on the patients suffered from heart diseases.The software design of remote wireless electrocardiogram (ECG) monitoring system is presented in this paper.The bottom program of MC9S12XS128 is used to collect the ECG data and control the AT injunction to the GPRS module,thus realizing the wireless transmission of ECG data.The system software is programmed by LabVIEW which has graphic programming environment,including the analysis,disposal,display and storage of the ECG data.The operator can measure the ECG quality of the patient real time for early diagnosis and treatment.An auto-alarm system is also designed.

    Design  of a Precise Delay Program  Based on Keil C51
    WU Ting-Yun, LIN Cheng-He
    . 2012, 25(12):  103. 
    Abstract ( 1172 )   PDF (880KB) ( 690 )  
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    In view of the poor predictability of the execution time of the C programming language code,we use C programming language to achieve the accurate design of delay procedure in detail,and point out the advantages and disadvantages of the usual delay methods.Besides,we take advantage of some powerful functions of Keil C51 to introduce the calculation of the delay time through some examples so that the delay time of the C programming language code can be predicted.Nesting the assembly language into C programming language can give full play to the advantages of all kinds of language and thus improving the development efficiency.

    Design of the Distributed Power Supply for Modern Communication Networks
    YU You-Cheng
    . 2012, 25(12):  107. 
    Abstract ( 1069 )   PDF (624KB) ( 706 )  
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    The power supply modes of communication network are studied.The advantages and disadvantages of the distributed power supply and the power supply requirements of modern communication network are discussed.A distributed power supply design scheme is proposed to meet the power supply requirements of modern communication equipments.It has some guiding significance for the power supply design engineers and technical personnel in modern communication network.

    LDPC Codes Relay HARQ System
    BAI En-Jian, XU Fei-Fei
    . 2012, 25(12):  110. 
    Abstract ( 1090 )   PDF (497KB) ( 854 )  
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    Different relay nodes have different fading characteristics in establishing the communication channel,and the relay node can improve the wireless channel spatial diversity and the transmission performance of the entire link.The use of error-correction can improve transmission efficiency of the channel.The article introduces the multi-relays hybrid-ARQ system based on LDPC codes,which can transfer data more efficiently without reducing the transmission rate.Different number of relay nodes have different effect on the average of bit error rate,throughput and the average of delay of the system.Matlab simulation show that the system model can decrease the average of bit error rate and delay and improve throughput of the system.At the same time,the multi-relays cooperative Hybrid-ARQ system based on LDPC Codes is better than that of Turbo codes in dealing with long codes.

    Intelligence Analysis and Warning System for Bridge Traffic Safety Incidents
    JI Yu-Chen, HE Jun-Ping, JIANG Yong-Li, YU Yong-Fang
    . 2012, 25(12):  113. 
    Abstract ( 975 )   PDF (799KB) ( 766 )  
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    In view of the harsh climate of Hangzhou Bay,the full implications of bad weather on the deck intelligent monitoring system for Hangzhou Bay Bridge are introduced,based on which a set of solutions are proposed to better monitor incidents by the monitoring system running on the deck of the Hangzhou Bay,and offer timely and effective solutions to the traffic incident occurred on the bridge deck.

    Security Assessment Model of Power SCADA System Networks
    LIU Liu, GAO Hui-Sheng, LI Cheng
    . 2012, 25(12):  116. 
    Abstract ( 835 )   PDF (719KB) ( 683 )  
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    Supervisory control and data acquisition system,is a smart grid is an important part of power communication system,is the guarantee of the basis for the normal operation of.With the development of power system in the broad application of computer network technology,SCADA system is more dependent on the information system and the remote communication network,the network security threats grow rapidly.In view of the network security assessment of the problem,put forward a kind of defense of network evaluation model combining evidence reasoning,in order to reduce the uncertainty assessment process of.Through the example analysis,proved the validity of the approach.

    A Web-based Membership Management System
    WEN Jia, LI Yin-Feng
    . 2012, 25(12):  120. 
    Abstract ( 1359 )   PDF (662KB) ( 743 )  
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    This article introduces the design and implementation of the web-based membership management system of Shaanxi electronics institute.The article begins with the key technologies used in this system,followed by the system architecture model and the functional modules,and finally gives the suggestions about the further improvements of this system.The system can facilities the routine management of institutes.

    Design of Vending Machines Based on PLC and Configuration Software Control
    NIE Hong
    . 2012, 25(12):  122. 
    Abstract ( 1364 )   PDF (759KB) ( 731 )  
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    This article introduces a PC monitor vending machine system with Siemens S7-200 programmable controller as the PLC and software configuration king 6.53 (King View) as the upper machine to achieve control.Practice has proved that the PLC and configuration king 6.53 software combinations can facilitate the realization of the design and testing of the automated monitoring system.The system operates normally with practical applications.

    Application of the Temporary Earth Wire Management System in Substation
    PAN Dong-Ming
    . 2012, 25(12):  125. 
    Abstract ( 950 )   PDF (557KB) ( 712 )  
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    In view of the lack of effective management and operation of most of the current Substation Microcomputer anti-misoperation lockout devices and the common problems in temporary grounding system in substation,this paper introduces a new temporary earth wire management system,which realizes the effective management of the temporary earth wire,eliminates the human negligence caused by malignant accident hidden danger,reduces the labor intensity of operating personnel human judgment,standardizes the temporary grounding line switching operations involved,lowers the maintenance work station comprehensive cost,and improves the level of modern management of the station.

    Read the Cursor Image Method Align Scale
    LI Jie, JIANG Yue-Wu, JIANG Qing
    . 2012, 25(12):  127. 
    Abstract ( 1163 )   PDF (529KB) ( 471 )  
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    The use of the two images collected before and after the camera image,the Hough transform,moving average,fitting handle the main scale and scale position the cursor,scale position of the cursor and the main scale comparative find alignment vernier scale,and in the case of close to a pixel size with a vernier caliper accuracy,can reduce the error effectively.

    Design of a Language Classification System
    SHAO Ze-Guo
    . 2012, 25(12):  130. 
    Abstract ( 661 )   PDF (533KB) ( 527 )  
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    In the process of language research,language classification and induction (according to one or more attributes or characteristics of a language) is a necessary part of and an effective method for observing and capturing the phenomenon and rules of language.To classify a language is also a precious step to render and portray itself in the GIS system.The classification system designed by the author is a sub-module of Chinese dialect geography information system,which has a general adaptability to various follow-up classifications.This paper,on the basis of the Chinese dialect phonetic system,discusses how to shift the computer technology into a powerful tool on the language research in terms of language features and language rules.The system helps language researchers in classifying languages fast and efficiently.

    Research on the Preliminary Treatment of Detected Capsule Image by Machine Vision
    ZHENG Han, WEI Wen-Bin, QI Zi-Cheng
    . 2012, 25(12):  133. 
    Abstract ( 943 )   PDF (703KB) ( 625 )  
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    The detection by machine vision obtains original image via camera,however the low quality and noisy hindrance make it difficult to read the picture directly.This article adopts the adaptive-median-filter for image filtering,and the method of maximum variance for separating the defects of image.The experimental result shows that both methods are effective in detecting capsule defects.

    Image Retrieval Based on Wavelet Transform
    DANG Ni, HU Fang-Ming, CAO Yue
    . 2012, 25(12):  137. 
    Abstract ( 1061 )   PDF (1136KB) ( 531 )  
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    A prototype image retrieval system based on wavelet texture feature is designed and implemented by extraction of image feature.The obtained texture features are used to retrieval database.The experimental results show that the wavelet transform is an effective texture feature extraction method that can effectively improves the retrieval accuracy.

    A Survey of the 3D Face Feature Extraction Method
    WANG Hong-Yong, WANG Qing-Qing
    . 2012, 25(12):  141. 
    Abstract ( 1159 )   PDF (529KB) ( 675 )  
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    Effective face feature extraction is the key component of face recognition technology.The traditional 2D images are vulnerable to illumination,facial pose and expression,while the effect of 3D data is thought to not vulnerable to illumination and facial pose.This article reviews 3D face feature extraction from the local features and the overall features.The article compares some of the methods and analyzes the effectiveness of these methods,and finally summarizes the advantages and disadvantages of the 3D face feature extraction method.

    Urban Power Network Planning Technology and its Processes
    LIANG Xuan
    . 2012, 25(12):  144. 
    Abstract ( 841 )   PDF (505KB) ( 585 )  
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    The main technical and economic characteristics of the electric power industry are described from the perspective of power grid planning.Some basic concepts of power grid planning,such as load rate,load at the same time rate,load rate,capacity load ratio and so on,are analyzed.City network planning is classified by time and voltage grade.And finally,the basic process of city network planning is put forward for references to electric power planning workers.

    The Research Study in Electronic College Physical Education
    SONG Bao-Jie
    . 2012, 25(12):  147. 
    Abstract ( 694 )   PDF (648KB) ( 483 )  
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    Physical education research in university should be the goal of teaching and learning,the whole process is to play student initiative process.This paper described the characteristics and significance of Physical Education in research study in university,based on combined electronic college physical education situation developed students' interest in learning,to establish clear learning objectives,to grasp the good opportunity,to learn and broaden the learning space specific measures laid the foundation for research sports teaching.At the same time,also pointed out that the controversial research method,the method of evaluation research,observational study,part polemic law in physical education,the focus of the research study.

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