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Table of Content

15 October 2014 Volume 27 Issue 10
  
    Articles
    Image-based Symmetry Recognition Algorithm
    DING Weili,LI Yong,WANG Wenfeng,SUN Dujuan,ZHANG Gai
    . 2014, 27(10):  1. 
    Abstract ( 1033 )   PDF (913KB) ( 1193 )  
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    In the description of visual features,symmetry is an important feature.Symmetry detection is an important image feature detection widely used in image processing,computer vision,information transmission and other fields and has broad application prospects.This paper presents the typical symmetry classification and several related algorithms with emphasis on the phase information based and SIFT operator based image symmetry approach.By selecting different types of images and using the two different methods,respectively,we compared the experimental diagrams and propose a symmetry detection method based on the closed contour corner point information and make a preliminary study of it.

    Human Behaviour Extraction Method Based on Shape Features and Movement Features
    HAN Junhao,ZHAO Huaixun
    . 2014, 27(10):  6. 
    Abstract ( 798 )   PDF (684KB) ( 798 )  
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    According to the deficiency of the traditional shape feature representation method in limited ability to describe actions,and accuracy and stability problems of movement feature representation method in capture the target motion characteristics,this paper extracts human behavior key features by combining shape features and movement features.Spectral clustering algorithm is used to reduce the dimension of the features.Through reducing the dimension of the data,the optimal feature representation is obtained.Simulation experiments show that this method can reduce the dimension of the example and data redundancy,enhance training accuracy and recognition rate.

    Miners' Lamp Identification System Based on Visible Light Communication
    CHEN Mingfang,MENG Xiaoliang,WU Yingfa,LIU Lulu,WANG Zhiwei,QIU Xuanbing
    . 2014, 27(10):  10. 
    Abstract ( 1002 )   PDF (800KB) ( 1024 )  
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    For miners' lamps,we widely apply the green solid-state Light-Emitting Diode (LED),which has low power consumption under the coal mine.Therefore,the visible light communication provides a new method for wireless communication underground.In this paper,based on the white LED of the miners' lamp,a visible identification system is designed.The identification system,which includes the identification card and reader card,realizes the information communication of identification,using the modulation technique of OOK and the coding structure of communication protocol.It has the advantage of illumination,communication and portability.It has a broad application prospect in ascertaining miners' attendance under the coal mine.

    Smart Home System Based on ZigBee Technology
    WANG Xuefang,HE Feng,GUO Wenshuang
    . 2014, 27(10):  14. 
    Abstract ( 813 )   PDF (759KB) ( 732 )  
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    The smart home is usually defined as using the computer,network and automation control technologies,integrate the equipment related to the household life into a system based on a fixed platform.Nodes and platform of this system communicate with each other by wireless communication technology,similar to that in a family local area network (LAN).This paper designs a smart home system based on ZigBee technology,capable of real-time detection and switch control of indoor temperature and humidity using ZigBee-based wireless communication technology.A video streaming server is also designed to provide indoor video information via the network to the remote client such as the mobile phone or PC web client.The video streaming server has good scalability,with support for a variety of common protocols and video data acquisition devices.

    Design of a High Integration UPA Transmission System Based on AD9106
    CAI Huijun,LUO Ying,ZHANG Wengan
    . 2014, 27(10):  18. 
    Abstract ( 871 )   PDF (1123KB) ( 807 )  
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    It is known that the UPA (Ultrasonic Phased Array) detecting technique has the advantages of dynamic focusing,detecting damages in objects with complex shapes,and precise defect locating.However,present detection equipments generally utilize the single chip to fabricate the single channel,and then expand it to multi-channel system,leading to low integration level and difficult maintenance.Based on the FPGA technique,a time delay algorithm and sequential control module were designed systematically,and then a large-scale UPA transmission system easy to be extended to even more than 32~128 channels was constructed based on AD9106 which consists of 4 channels in one chip and released by ADI company lately.Further,a high speed transmission/reception diverter switch was designed and configured,which can accomplish self transmit and self receive of multi array elements,and finally the complexity and size of transmission and reception hardware modules in this system was lowered tremendously,while the high pressure impulse of the transmission module was restrained.The UPA transmission system has the advantages of high integration,anti-jamming capability,detection accuracy,security as well as low power dissipation.

    Application of Configuration Software in Online Monitoring of Power Distribution System
    TIAN Fanshun,WANG Jun
    . 2014, 27(10):  22. 
    Abstract ( 611 )   PDF (974KB) ( 628 )  
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    A power distribution system of online monitoring service platform is proposed in order to improve power security.The operation condition of the power distribution system is monitored based on network configuration software.Users can remotely view the running status and the alarm information and impose remote control.The platform provides data support for more economic and efficient operation of the power distribution system.

    A New Bidirectional Automatic Controlling System of Water Temperature
    WANG Ying,WANG Geng,WANG Jiao,XIN Yunhong
    . 2014, 27(10):  26. 
    Abstract ( 743 )   PDF (835KB) ( 820 )  
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    The traditional controlling system of water temperature has such deficiencies as simple design,poor adaptability,low precision and unidirectional control.The new design has achieved bidirectional automatic control of water temperature by using AT89C52 SCM as the control center.Based on the D-value of the actual and the setting temperature,the SCM generates adjustable PWM to control the power of the heating and refrigeration module.Experiments show that the system has fast dynamic response,small overshoot and high control precision.

    Implementation and Application of Fuzzy PLC in PID Based on the Forecast Model
    WANG Yalei,HUANG Mengtao
    . 2014, 27(10):  29. 
    Abstract ( 849 )   PDF (730KB) ( 692 )  
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    To improve and expand the application of the PLC controller and to solve the problem that it is difficult for the accurate model to determine the industrial control system with time delay,nonlinearity,and asymmetry,the idea of fuzzy control and the forecast model are combined with the traditional PID control,forming a forecast model of fuzzy-PID control method,and simulation is done in Matlab/Simulink.Test results show that the method is feasible,and has greatly reduced the system overshoot and adjustment time,the system has good steady-state performance,the adjustment process is stable,and the control precision is greatly improved.

    Research on and Development of Large Scale Sculpture 3D Perspective Correcting System
    ZHENG Naixing,WANG Yixuan,WANG Yigang,PAN Wanbin,JI Zhongping,LONG Xiang,HUANG P
    . 2014, 27(10):  33. 
    Abstract ( 996 )   PDF (849KB) ( 673 )  
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    Due to the nonlinearity of the human eye perspective,large-scale sculptures need to be corrected fluoroscopically in the proportional amplification of sculpture manuscripts based on the observed effects of the perspective.The original manuscript sculptor needed to make amplified sculptures with correct perspective manually.Due to the large size of sculptures,making sculptures manually is labor consuming.In order to reduce the workload,the paper researched and developed a sculptural perspective correction system.In this system,first the manuscript sculpture 3D scan data model is read into the system,so that designers can use the computer to amplify the analog model data and correct its perspective in a virtual environment.Then the computer-generated model is divided and mechanically processed into a large-scale sculpture,thereby reducing the time for real sculpture correction and amplification.

    Road Edge Detection Technique Based on the Linear Model
    LIU Jinlong,ZHANG Xiaoyu
    . 2014, 27(10):  36. 
    Abstract ( 829 )   PDF (907KB) ( 798 )  
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    In order to provide the real-time information about the front road for vehicles,a boundary model for the straight road is established and a road edge detection algorithm is introduced.A rough edge region is obtained through gradation,histogram equalization,filtering operations,edge enhancement and binarization.Then road edges are detected according to the neighborhood characteristics.Simulation results show that this algorithm can detect the road edges accurately.

    Image Fusion Method Based on Multi-objective Particle Swarm Optimization
    SUN Xin,NA Yan,WANG Junpeng
    . 2014, 27(10):  40. 
    Abstract ( 727 )   PDF (670KB) ( 755 )  
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    The fusion algorithms with multi-scale transformation based on frequency domain are hotspots in multi-sensor image fusion.This paper proposes a new image fusion algorithm,which is based on multi-objective particle swarm optimization and further processes the fusion image set available by the current image fusion algorithms with multi-scale transformation based on frequency domain.Experimental results show that the algorithm has good fusion effects.

    Design of a Stepper Motor Control System Based on the Cortex-M3
    BAI Yu,LIU Bing,LI Zhi
    . 2014, 27(10):  43. 
    Abstract ( 741 )   PDF (593KB) ( 909 )  
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    Cortex-M3 is the latest ARMv7 architecture-based processing core released by ARM.The stepper motor has been widely used in the control field such as position and speed.This paper designs a stepper motor control system based on the Cortex-M3 core with human-computer interaction.The Cortex-M3 based ARM controller,which has rich on-chip peripherals,is the core of the system.The design of the human-computer interaction and the motor module are analyzed in detail.The software is presented on the system main flow chart.Compared with other motor control systems.the system has simple operation and high control accuracy.

    Tool Management System of Flight Security Based on ZigBee Technology
    TAO Qingyun,TANG Lijun
    . 2014, 27(10):  46. 
    Abstract ( 773 )   PDF (766KB) ( 732 )  
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    In order to achieve the aim of the aviation daily flight security to maintain tools for the remote real-time precise management,a real-time management system for tools based on ZigBee wireless sensor networks and barcode technology is designed.The system consists of three parts,terminal data acquisition system,ZigBee wireless sensor networks and PC monitoring.In this system,the barcode gun collects tools items,the wireless sensor network transmits data,the PC side writes the VB application which has realized data processing and human-computer interaction.In addition,the real-time tool management of maintenance on the spot is achieved,which enhances working efficiency and eliminates the occurrence of human errors.Therefore,it is of great significance to flight safety.

    Design of Micro-class Teaching Competition System Based on ThinkPHP Framework
    WANG Chi,LI Yinfeng
    . 2014, 27(10):  51. 
    Abstract ( 651 )   PDF (1018KB) ( 791 )  
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    In view of the absence of micro-class teaching competition systems for most of colleges and universities in China,an overall design of the micro-class teaching competition system based on ThinkPHP framework and other framework technology is presented by using the key technologies such as frame screenshot technology and the plug-in technology to provide a platform for teachers and students to improve themselves and get online teaching resources,meeting the requirements of the micro-class teaching competition of universities.

    Design of a Capacitance Method Liquid Level Sensor System Based on Pcap01
    XIA Ji,YANG Yashan,CHEN Xing
    . 2014, 27(10):  55. 
    Abstract ( 882 )   PDF (733KB) ( 1065 )  
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    In order to measure petrol in the fuel tank,utilizing the principle of capacitance which changes with the change of the transmission medium between plates,a capacitive liquid level sensor system has been designed based on Pcap01 chip which transfers capacitance to the digital mode by containing a microcontroller (MCU).For the purpose of data calibration,the cylindrical capacitive sensor has been applied to reduce parasitic capacitance as well as the setting of the internal register of Pcap01 chip.This system has been tested repeatedly in an experimental platform.Experiments show that this system has good accuracy linearity.Thus,this capacitive liquid level sensor system has been presented.

    An Effective FIFO Reset Strategy
    ZHANG Wei,FAN Lizhen,WANG Hongzhan
    . 2014, 27(10):  59. 
    Abstract ( 712 )   PDF (500KB) ( 651 )  
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    An effective strategy for FIFO reset is introduced.In logical design,the FIFO is used for data storage.When the system is abnormal,FIFO may drop packet and cannot recover,in which case a soft FIFO reset is often used to to save the system at minimum cost.But the random FIFO reset may occur in the data packet processing,leading to incomplete packet writing into FIFO and thus system failure.Therefore a good FIFO reset strategy is necessary.

    Analysis of Automatic Tracking Technology in Oracle Database Maintenance
    LIANG Shujie,HUANG Xubin
    . 2014, 27(10):  61. 
    Abstract ( 735 )   PDF (605KB) ( 698 )  
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    This paper mainly analyzes the dynamic tracking technology in the application of the Oracle database maintenance.Automatic tracking technology is applied to Oracle data backend tracking and SQL statements,according to the database information and the related parameters for full resolution.Automatic tracking technology can help database administrators to optimize maintenance workflow and database performance and facilitate users' operation.

    Research of Workshop Dynamic Scheduling in MES Based on the Artificial Fish Algorithm
    LIAO Shengjuan
    . 2014, 27(10):  64. 
    Abstract ( 688 )   PDF (705KB) ( 639 )  
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    There is much uncertain information and disturbance in work shops.To resolve the dynamic scheduling problem in the manufacturing execution system in the work shop,this article designs a workshop dynamic scheduling in the manufacturing execution system based on the artificial fish algorithm.The artificial fish algorithm is further researched.It can be used for the discrete system after partial modifications and improvements according to the actual situation.It optimizes the quality of scheduling results when applied to workshop dynamic scheduling in the manufacturing execution system.

    An Improved Genetic Algorithm for the Knapsack Problem
    NIU Huilan,LIU Yuan,ZHU Haixiao,LIU Xiaohui
    . 2014, 27(10):  67. 
    Abstract ( 644 )   PDF (724KB) ( 560 )  
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    In order to improve the local search ability of the genetic algorithm in solving the knapsack problem,the taboo search algorithm is integrated into the genetic algorithm which is used for global search,and it is used for local search.This paper elaborates the basic idea of these algorithms,and presents the model that is applied to the solution of the knapsack problem.The result of an example shows that this algorithm has better performance and faster convergence speed.

    A Heuristic Network Strategy Model and Algorithm to the 0-1 Knapsack Problem
    XIA Qian,ZHANG Xiaolong
    . 2014, 27(10):  71. 
    Abstract ( 736 )   PDF (778KB) ( 667 )  
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    In order to overcome GA's disadvantages that it can be easily trapped into local optimization and has low accuracy of search,a network strategy heuristic genetic optimization algorithm has been proposed,and the algorithm has been successfully applied to solving the 0-1 knapsack problem.In this algorithm,the strategy of network node correlation is introduced to improve the global optimizing capability.This paper also introduces network node matrix optimization and uses its thorough local traversal search to improve the solution accuracy.The simulation results show that NSHGA can not only avoid premature effectively,but also has powerful optimizing ability and high optimizing precision.Compared with basic genetic algorithm simulation,NSHGA can obviously improve the accuracy of the solution to the 0-1 knapsack problem.

    Optimized Selection of 3D NoC Test Ports Based on the Cloud Evolution Algorithm
    CHEN Jiadong,LI Xiangmei
    . 2014, 27(10):  76. 
    Abstract ( 739 )   PDF (717KB) ( 648 )  
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    In order to solve the problem of how to select 3D NoC test ports so that we can improve test efficiency,a method is proposed in this paper.This method uses the evolution algorithm based on the cloud model to select 3D NoC test ports and allocate the test data of IP cores to the test ports reasonably,and then tests the IP cores in parallel under power constraint by reusing the on-chip network as the test access mechanism and using the XYZ routings algorithm and non-preemptive test scheduling to achieve improve the test efficiency.Experiment results demonstrate that the proposed method can improve the precision for searching the test ports position and combination,and reduces the test time efficiently.

    Research on the Data Transmission System Between the Internet of ZigBee and Ethernet
    LI Yifeng,ZHOU Jianhua,PAN Yuguang,LIU Bin
    . 2014, 27(10):  80. 
    Abstract ( 782 )   PDF (793KB) ( 810 )  
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    Among all the developing application systems for the Internet of things,the data transmission system between the Internet of ZigBee and Ethernet is an important research object,which enables us to have the initiative of developing application systems.This paper gives a brief introduction to the data transmission system between the Internet of ZigBee and Ethernet with emphasis on the monitoring system of ZigBee network and Ethernet data transmission mechanism in the process,and ZigBee network and Ethernet data frame transformation and the realization of the interaction.

    Simulation and Realization of Blind Demodulation of PSK with Matlab
    ZHAO Long,MENG Qinghe
    . 2014, 27(10):  84. 
    Abstract ( 708 )   PDF (624KB) ( 641 )  
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    In demodulating PSK signal,parameters of the signal may be unavailable,as a result of which blind demodulation is very important.This paper briefly introduces a method for estimating carrier frequency by square and estimate symbol rate by delay multiplied and a simulation algorithm for blind demodulation of PSK with phase-locked loop.The simulation indicates that this algorithm has good demodulation effect.

    Parallel Interference Cancellation Algorithm for MIMO SC-FDMA Timing Synchronization in LTE-Advanced Uplink
    GUO Ning,PENG Duan,LI Yuan
    . 2014, 27(10):  87. 
    Abstract ( 887 )   PDF (640KB) ( 795 )  
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    A timing synchronization algorithm combining QR decomposition with parallel interference cancellation is proposed.The problems caused by timing deviation in LTE-Advanced uplink MIMO SC-FDMA system are solved.The preliminary information estimate is obtained by the QR decomposition algorithm,and the interference which is generated by timing offset is eliminated from the received signal by this method.Theoretical analysis and simulation results show that the algorithm can significantly improve system performance.

    Research on and Implementation of Test Scheduling for 3D NoC
    YIN Zhi
    . 2014, 27(10):  91. 
    Abstract ( 819 )   PDF (824KB) ( 703 )  
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    With the development of the integrated circuit to multi-core technology and 3D integrated,the 3D NoC (Three Dimensional Network-on-Chip,3D NoC) test problem is becoming increasingly obvious.This paper,using the NoC reuse test access mechanism and XYZ routing,establishes a power model,allocates the test data of IP core to each TAM by the cloud evolutionary algorithm to complete the test scheduling of 3D NoC resources cores,and then takes parallel testing to reduce the total test time.With ITC′02 test circuit as the simulation object,an experiment is done,which shows that this method can reduce the total test time and improve the test efficiency.

    Adaptive Wavelet Package Decomposition Threshold De-noising Algorithm
    CHEN Jie,HUANG Youhuo
    . 2014, 27(10):  95. 
    Abstract ( 865 )   PDF (620KB) ( 690 )  
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    This paper presents a new adaptive wavelet package decomposition threshold de-noising technique (AWPDD).By this new method,signal is adaptively decomposed into wavelet package sub domains and according to the signal to noise ratio of each sub domain,we can determine the de-noising threshold and whether or not the sub domain should be decomposed further.Unlike the traditional methods,the new method only helps to decompose the partial contour and detail signal of some scales based on their signal to noise ratio.After de-noising,the signal is reconstructed by the inversely procedure of decomposition.Simulation results show the new method can lower the computing volume and the signal after de-noising is more close to the original no noise signal.

    Estimation of RCS Based on the Finite Element Method
    LIU Liang,LI Shuhua,XING Zhichuan
    . 2014, 27(10):  98. 
    Abstract ( 929 )   PDF (732KB) ( 637 )  
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    Calculation of objects' RCS has been the focus of study of electromagnetic scatting with accurate and efficient solution to RCS being the main direction of research.This paper introduces the electromagnetic field Finite Element Method (FEM) and the FEM based HFSS simulation software.Emphasis is put on the analysis of the effect on accuracy of HFSS boundary condition and mesh grading in the solution process,and calculation examples are offered.Results show the correctness of FEM for objects' RCS.

     Noise Detection Based on the Difference Method and Image Filter Algorithm Based on the Variational Method
    LI Jin,WANG Xuan
    . 2014, 27(10):  102. 
    Abstract ( 776 )   PDF (1420KB) ( 663 )  
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    The salt and pepper noise filtering algorithm of the image is not accurate enough in the noise testing phase,and it can not protect the edge information in the recovery phase noise.In this paper,we propose a two-phase approach to restore images corrupted by blur and impulse noise.The proposed filter has a two stage scheme:detecting noise and removing noise.First,an impulse noise detector is presented,by augmenting the ordered difference of the current pixel value with other pixels' value in the sliding window to determine whether the current pixel is a noise pixel or not.Then,these noise pixels are restored using the variational method,which can preserve image edges and details.Experimental results show that the method proposed in this paper is superior to other methods at very high noise level.

    Improved Algorithm for No-Fit Polygon Calculation
    GUO Ruifeng,YE Yan
    . 2014, 27(10):  107. 
    Abstract ( 830 )   PDF (595KB) ( 1014 )  
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    Nesting is the key problem to be solved in industrial areas.The optimal abutting position and overlapping heavy judgment of polygon are the most critical issues which need repeated calculation.The NFP's fast calculation has become a key nesting algorithm.After an introduction to the basic definition of NFP and mobile collision algorithm,we propose an improved algorithm for solving NFP based on sliding track.Then we describe the no-fit polygon's generation process and algorithm's implementation process.With the mobile collision algorithm as reference,we verify the improved algorithm's time complexity by experiments.Simulation results show that the improved algorithm can effectively reduce the time complexity of the algorithm and is therefore of value for solving the problem of nesting.

    Algorithm Research for Semi-structured Text Information Extraction Based on Hidden Markov Model
    SUN Shiyao,MIAO Quanxing
    . 2014, 27(10):  111. 
    Abstract ( 697 )   PDF (866KB) ( 541 )  
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    A new algorithm based on Hidden Markov Model is proposed for semi-structured text information extraction.Compared with the traditional algorithm,the simulation results show that the proposed algorithm has obvious optimization on the precision and recall rate,especially still maintianed good accuracy in few state features.The proposed algorithm appears good feasibility and validity in the application of semi-structured text information extraction.

    Structural Learning Bayesian Network Based on a Hybrid Method
    ZHANG Yan,ZHU Mingmin,SONG Suming
    . 2014, 27(10):  115. 
    Abstract ( 747 )   PDF (758KB) ( 800 )  
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    A hybrid algorithm for structure learning of Bayesian network which based on maximal prime decomposition technology and genetic algorithm is proposed.The algorithm first constructs the undirected independence graph of a BN according to domain knowledge and observation data.Then it performs MPD to decompose the undirected graphs.The genetic algorithm is used to learn the local structure and combine the subgraphs then correct them to obtain the final BN.The decomposition splits the problem of learning a large network into some problems of learning small subgraphs.Experimental results show that the learning ability and performance of novel algorithm are improved significantly.

    Research on Real-time Sensor System Based on Simulink
    SHI Jingwen,CHEN Wenyi
    . 2014, 27(10):  119. 
    Abstract ( 859 )   PDF (728KB) ( 722 )  
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    This paper presents a real-time simulation system of sensor network on the foundation of IOT gateway based Matlab to address the problems during the development of Internet of things (IOT) caused by the variety and combination with embedded system of IOT.It is constructed with Simulink model tools and real-time windows target (RTWT),and realizes Modbus protocol and actualizes its real-time communications with gateway computer.

    Techniques and Forecasts on Information Retrieval in Microblog
    YOU Xiang,GE Weili
    . 2014, 27(10):  123. 
    Abstract ( 912 )   PDF (908KB) ( 803 )  
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    As a new social media,microblog played a very important role in the information distribution and public opinion propagation,with its multiple platforms usage,rapid propagation and strong interaction.Basic concept of microblog was introduced firstly.Secondly,several commonly used techniques on information retrieval,acquisition conditions selection,and data expression methods in microblog were surveyed and classified.Thirdly,we discussed some choke points.At last,based on the analyzed problems,suggestions for future research works were put forward.

    Design and Analysis of Spread Sspectrum System Based on Quadriphase Sequences
    WANG Xiao
    . 2014, 27(10):  127. 
    Abstract ( 718 )   PDF (516KB) ( 709 )  
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    A Quadriphase sequence spread spectrum modulation and demodulation method based on the principle of Quadriphase sequence is proposed in this paper.This method takes advantage of four-phase sequence and QPSK to simulate with Gaussian white noise channel.The experiment results demonstrate that,compared with multi-band orthogonal spread spectrum system,the method in this paper could greatly improve the capability of data transmission and capacity of resisting disturbance.This method is appropriate for high-speed data transmission.

    Implementation of DDC and DUC in Satellite Navigation Receivers with Anti-jamming Ability Based on FPGA
    LI Yingxin,CHEN Jianchun,XU Fei
    . 2014, 27(10):  129. 
    Abstract ( 801 )   PDF (772KB) ( 897 )  
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    DDC and DUC are designed and implemented based on software radio in the satellite navigation receiving system with anti-jamming ability according to the structure of the satellite signal and the frequency characteristic.Models are established in Matlab for simulation according to the A/D sampling frequency and convert digits of the system and stop-band attenuation,frequency selectivity,gain,input and output frequency.Then the design scheme of DDC and DUC is determined and implemented on the hardware,with focus on the NCO and filter bank design,including CIC,the HB filter and the compensation filter.The simulation verifies that the requirements of system design are met.

    Detection of Multicomponent LFM Signal Based on Fractional Fourier Transform
    LIU Mingling,LIU Gaohui
    . 2014, 27(10):  133. 
    Abstract ( 756 )   PDF (589KB) ( 501 )  
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    As a tool of analysis,Fractional Fourier transform is put forward lately.Its transform domain both has the time domain and frequency domain information of the signal.Essentially it is a generalized form of Fourier transform suitable for processing unstable LFM signal.By searching for the peaks in the fractional Fourier domain,the multi-component LFM signal detection and parameter estimation is done.And the successive elimination thought is adopted to separate LFM signals with multiple unknown parameters.The interference of strong signal components with the weak signal components are restrained.

    Design of Data Transmission Between PC and FPGA Based on USB3.0 Bus Protocol
    YANG Cuicui,ZHU Xiangdong,LI Fan
    . 2014, 27(10):  136. 
    Abstract ( 940 )   PDF (815KB) ( 967 )  
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    A high-speed data acquisition system is designed to solve the problems in bandwidth limitation.The design consists of the USB3.0 Interface System,USB3.0 Firmware and R/W Operation of SLAVE FIFO to FPGA.Test results show that the USB3.0 transmission rate reaches 260 MByte·s-1 with a stable data transmission speed of Continuous Data Acquisition System up to 100 MByte·s-1.

    Design of the Antenna with 433 MHz RFID Tags
    WU Yapeng,ZHAO Qing,YANG Kaiwen
    . 2014, 27(10):  139. 
    Abstract ( 805 )   PDF (1048KB) ( 846 )  
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    The active radio frequency identification positioning system has now been widely used in a variety of positioning scenarios.The meander line is applied to designation of 433 MHz tag PCB antenna to meet the requirement of the miniaturization of electronic tags under the actual scenarios.The PCB antenna is designed in the semicircle space of a diameter of 14 mm with a gain of -17 dB.Based on the lumped circuit,the antenna achieves a resonance characteristic of 433 MHz and a 50 Ω impedance match between the antenna and the chip.

    Design of a Simulation Experiment for Electric Vehicle Power Battery's Working Condition
    CHEN Xueqiang,JIN Peng,LIN Peng
    . 2014, 27(10):  142. 
    Abstract ( 846 )   PDF (962KB) ( 820 )  
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    In the practical application of electric vehicle power battery,long-period real road tests are needed,and the experimental process is complicated and costly.To solve this problem,based on the data collected by the battery management system(BMS) created on Freescale MCU MC9S12XEG128 and data acquisition and monitoring system created on Visual C#,the Arbin electric vehicle test systems are used to design a power battery working condition test platform with the real-time multi-parameter sampling,display,storage,and real road simulation test functions.The test results show that the scheme can obtain the same results with real road tests.

    Application of Surge Protection and Sound Proof Devices in the Radar Terminal
    MO Jun,LIU Jian
    . 2014, 27(10):  147. 
    Abstract ( 674 )   PDF (540KB) ( 618 )  
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    The terminal system is an important component of the radar.Some of its external interface circuits will be damaged by lightning surge,which will prevent the system from normal work.In order to avoid the loss caused by lightning surge for the terminal system,the article introduces the surge protection and sound proof devices that are designed by methods including power supply,ground sound proof,relay insulation blocking,piezoresistor,voltage suppressing diode,signal optoelectronic isolation etc.These surge protection and sound proof devices suppress the lightning surge efficiently and protect the external interface circuits of the terminal system.The validity of surge protection device is verified through engineering tests.

    The Tracking System of Vehicular Three-Axis Photoelectric Based on Hybrid Optimization
    GUAN Bolin
    . 2014, 27(10):  150. 
    Abstract ( 677 )   PDF (912KB) ( 521 )  
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    With a redundant heeling-axis,the three-axis photoelectric tracking system can avoid the spatial blind region of the two-axis tracking system,and track the target in the whole space.By using the quaternion method,the kinematical model of the vehicular three-axis photoelectric tracking system is built based on the movement analysis of the system.Then a hybrid optimization is designed for the tracking strategy of the vehicular three-axis linkage tracking system.Through the analysis of the kinematical model,the relationship of the three axes' angles can be obtained.Then three-variable optimization of the three axes angular increments can be simplified as the optimization of signal-variable,and the optimal angular increments are calculated by using the hybrid optimization method.The simulation and experimental results show that this tracking strategy could improve the tracking performance of system and is of great practical value,which tracks the target with smaller tracking angular increments,and the system can realize three-axis linkage continuous tracking movement in the whole space.

    Parallel test for Digital Microfluidic Biochips Based on the Ant Colony Algorithm
    CAI Zhen
    . 2014, 27(10):  156. 
    Abstract ( 814 )   PDF (1006KB) ( 603 )  
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    Dependability is one of the important attributes of digital microfluidic biochips,especially in safe-critical applications.It is necessary to adequately detect faults in digital microfluidic biochips both after fabrication and while in use to acquire the accurate result.We present a parallel droplet test scheme based on the ant colony algorithm.First the approach turned the chip module into the MTSP module,and then employed the algorithm for the module to acquire the test path of digital microfluidic biochips.The result shows that our method could reduce test time and improve test efficiency,especially in large scale digital microfluidic biochips.

    Design of a CMOS Rectangle Wave Oscillator
    LIU Xifeng,JU Shuirong,YANG Shiwei
    . 2014, 27(10):  160. 
    Abstract ( 690 )   PDF (548KB) ( 469 )  
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    The oscillator is one of the most important and common unit circuits in the digital integrated circuit.With both of frequency and CMOS process considered,this study designs a circuit for the CMOS rectangle wave oscillator.This oscillator adopts the standard CMOS circuit,and could provide stable rectangle wave signals.The frequency and pulse width of the output signal can be adjusted.

    The Design and Implementation of thermostatic Bath Automatic Detection Instrument Based on the UCOS Ⅱ
    BAO Huawei,XIAO Xiaoting,LONG Fei,ZHANG Zhengli,LIU Yuhong
    . 2014, 27(10):  163. 
    Abstract ( 791 )   PDF (881KB) ( 550 )  
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    The Real-Time embedded Operating System μc-OS Ⅱ is planted to STM32F103 chip platform to deal with the multitask,including deferent point temperature detection,LCD display,print and so on.The temperature data is collected through the structure based on the 24 bit high-precision analog-to-digital conversion chip AD7793,and the position of the sensor is changed by system to control step motors of this structure.This system is functioned with real-time temperature collecting of the thermostatic bath,displaying the data on the LCD,processing data to output performance indices of the thermostatic bath,and printing all the data and performance indices and so on.

    Test of NoC System Communication Link Based on BIST
    WAN Chunting,YANG Juan
    . 2014, 27(10):  167. 
    Abstract ( 745 )   PDF (819KB) ( 679 )  
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    With the development of Network-on-chip(NoC) system,it is necessary to test the Network-on-chip communication link.In this paper,the Build-In Self Test (Build-In Self Test,BIST) technology has been used to complete the communication link testing of the NoC system.The testing includes the link testing between the router node and the testing between a router node and the resource node which is connected with it.Verilog HDL language described with hardware is used to complete the design of each testing module.Then the logic analyzer with Quartus II software is used to complete the testing on NoC system hardware platform based on FPGA.The test method not only improves the fault coverage,but also greatly reduces testing time.

    Study on Shielding Effectiveness and Measurement Methods for Electromagnetic Shielded Enclosure
    HUANG Liuhong,YANG Jixiang,CHEN Jinyang,GUO Shixu,ZHOU Huijuan
    . 2014, 27(10):  171. 
    Abstract ( 758 )   PDF (733KB) ( 560 )  
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    Measuring the shielding effectiveness of electromagnetic shielded enclosures is the only way to determine the grade of electromagnetic shielded enclosures.Therefore it is important to select the appropriate criteria for measurement method and classification.In this paper,the current standards for classification and measurement method are compared.Some suggestions about how to select the appropriate criteria in the actual measurement are given.Finally,some issues on single point and multi-point grounding,insulation,and electromagnetic shielding door settings are discussed.

    Design of a Multiband Printed Monopole Antenna
    WEN Yaotong,LIU Nengwu,ZHANG Zhiya
    . 2014, 27(10):  175. 
    Abstract ( 911 )   PDF (671KB) ( 488 )  
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    A novel compact dual-frequency printed monopole antenna for 2.4/5.2/5.8 GHz WLAN and 2.5/3.5/5.5 GHz WiMAX applications is proposed.The antenna owns the feature of compact operation and can be easily integrated into most wireless communication equipments.By combining the symmetrical bowtie patch,slot and angle-shaped strip,the antenna can achieve a wide impedance bandwidth covering WLAN and WiMAX,which is fed by a 50 Ω microstrip transmission line.The good gain over the operating bands has been obtained by the fabricated antenna with a compact size of 30 mm×32 mm,which is suitable for wireless communication applications.

    Design of a Color Rotary LED Screen Display
    SHEN Jie,LI Chunsheng,SHA Chunfang,WANG Zhongchun
    . 2014, 27(10):  178. 
    Abstract ( 671 )   PDF (642KB) ( 554 )  
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    In order to solve the single-color defect of common rotary LED screen display,the paper presents a design of 4096 color LED POV based on MCU and three-color LED by the principle of temporal mixed color.The color of the pixels is coded with 12 binary digits,and each 16 gray-scale levels of R/G/B is achieved by superposition of 4 frames which have different brightnesses.In addition,the paper presents a way to mitigate the image trails by inserting a dark time slot between the time intervals of displaying two adjacent pixels.Experiments show that the system is stable and has good display effect.

    Design of Quad-Band Splitters Based on the Genetic Algorithm
    DING Xu,MA Shiwe,QIAO Long
    . 2014, 27(10):  182. 
    Abstract ( 675 )   PDF (496KB) ( 461 )  
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    This paper presents a new design method of analysis which takes into consideration the effect of the four-level frequency power splitter.The method is based on genetic algorithms.According to the ideal transmission line model,the quad-band decile wilkinson power splitter consists of four impedance saving converter and four isolated resistors.This paper first uses genetic algorithms and analysis methods combined with dual-mode impedance converter to optimize design parameters,and then completes isolation resistor setting in the ADS software.In order to verify the correctness of this method,a quad band wilkinson power splitter in the range of 0~5 GHz is designed.A number of experimental results have a good match and isolation at the desired frequency.

    Application of the Equivalent Circuit Model Method in Filter Design
    LI Gang
    . 2014, 27(10):  185. 
    Abstract ( 669 )   PDF (738KB) ( 550 )  
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    In this paper,an equivalent circuit model is proposed to design the filter with NRN element.First,the paper points out the drawbacks of the conventional design method based on the coupling coefficient.Then,a mixed method with the general coefficients and equivalent circuit model is proposed and NRN scaling property is analyzed.A complete design example is verified with circuit simulation software.The results verify the validity of the method.

    Implementation of PCIe Interface Based on Altera FPGA
    JIANG Ning,CHEN Jianchun,WANG Pei,SHI Ting
    . 2014, 27(10):  188. 
    Abstract ( 724 )   PDF (795KB) ( 631 )  
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    PCI Express is a high performance interconnect protocol is widely used in many areas of the network adapter,graphics accelerator,network storage,and large data transfer in embedded systems.This paper describes the architecture of PCIe,and highlights the use of Altera Cyclone IV GX FPGA family to achieve hardware PCIe interface card parameters involved,the application layer system solutions,DMA arbitration,and PCIe hard-core configuration with read and write timing.

    Direct Power Control Strategy for Inverters of Wind Power Generation System
    WANG Yuye,XIANG Wei
    . 2014, 27(10):  192. 
    Abstract ( 748 )   PDF (854KB) ( 442 )  
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    This paper proposes a control strategy for wind energy integration into power network,and researches the structure and its inverter.The optimal dual PWM "back to back" converter topology and direct power control strategy are used to further enhance the wind power generation system and network performance.A network simulation model system with an output power of 10kW is built to verify the correctness of the control strategy.The results show that the "back to back" converter topology has the advantages of reasonable structure based on direct power control strategy,novel control strategy,stable DC voltage,low harmonic distortion of grid current and good waveform,achieving unity power factor and network and meeting the networking requirements.

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