Table of Content

15 August 2012 Volume 25 Issue 8

  

Articles

Simulation Analysis of a New Type of Microstrip Antenna with Cylindrical Dielectric Resonator

WANG Lei-Lei, AN He-Zhi, LI Ping, ZHANG Wen-Hui

. 2012, 25(8):  1. 

Abstract ( 1053 )   PDF (660KB) ( 882 )  

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Based on the theory of the DRA and antenna feed mode,the thesis analyzes the influence of two factors on the antenna performance including the height and radius of the cylindrical dielectric resonators.Ansoft HFSS is applied to establish this model and the simulated VSWR is offered as a result.The simulation results show that the antenna performance is the best when R_c is 2.9 mm and H_c is 4 mm,and that the optimized parameters of the cylindrical dielectric resonator improve the performance of the antenna.

Development of a Proteus-Based Cardiovascular Tester Endpreamplifier

WANG Jing, XU Bin, ZHANG Kai, CHEN Da

. 2012, 25(8):  3. 

Abstract ( 962 )   PDF (605KB) ( 793 )  

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The cardiovascular tester based on the embedded computer is an updated version of the previous one.We developed a preamplifier circuit which can filter and amplify the pulse signal and the amplification can be easily adjusted by the embedded computer.The Proteus is adopted,on which circuit simulation and performance analysis is conducted.The results show that the simulation results and actual results are very close and meet the design requirements.Our design can improve design efficiency and save cost and is therefore worth popularizing.

Design of a Low Temperature Float High Precision CMOS Bandgap Reference

WANG Yu-Xing, CAO Xiao-Jun, JIANG Sheng-Yu, WU Jin

. 2012, 25(8):  6. 

Abstract ( 1202 )   PDF (551KB) ( 899 )  

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Based on the basic principles of linear segmented compensation and the output branch structure of the internal temperature of negative feedback,this paper proposes a novel structure which is simple and adapts to high order compensation methods of different opening directions.It also designs a low temperature float high precision voltage reference circuit based on the current mirror structure.Simulation by the CSMC 0.35 μm CMOS process indicates this bandgap reference can reach a temperature coefficient of 2.84 ℃ from -40 to125 ℃.PSRR can reach -70.6 dB and -63.36 dB at 100 Hz and 10 kHz PSRR,respectively.When the power supply voltage is in the range 2~3 V,the voltage fluctuation value is 3 mV/V.The proposed BGR has good overall performance.

All-in-one Instrument Design and Implementation Based on FPGA

ZHAO Yun, GUO Qing, LUO Su-Sheng, SU Hai-Tao

. 2012, 25(8):  10. 

Abstract ( 941 )   PDF (550KB) ( 789 )  

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The implementation scheme for the all-in-one instrument based on FPGA is proposed.It applies the 32bits NIOS processor and customizes the hardware system on DE2 Development based on the flexible allocation of SOPC.The function of digital oscilloscopes and function signal generator is realized through programming in the NIOS IDE environment.This system makes the control unit and timing unit designed on one chip and therefore achieves good portability.The experimental results show that the oscilloscopes and generator can work in parallel.

Design of a Liquid Crystal Display System for the Single Chip Microcomputer

DUAN Xin-Yan

. 2012, 25(8):  13. 

Abstract ( 1231 )   PDF (605KB) ( 983 )  

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This article introduces the C8051F single-chip micro-computer and the LCD controller KS0108.Using them as the core,we have designed the single-chip micro-computer LCD system.In the thesis,we put emphasis on the technology of graphic dynamic display,and describe the LCM's hardware and software features.The circuit that we have designed is emulated in the C8051F020 single-chip micro-computer emulation experiment system.That experimental result shows that we have achieved the expected goal in the design.

The Drive Technology of Sawtooth Wave for Fabry-Perot Filter

WU Wei-Wei, YU Wei-Long, LI Xun-Tao, WU Wen-Bin

. 2012, 25(8):  16. 

Abstract ( 1297 )   PDF (592KB) ( 773 )  

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The working principle of the tunable Fabry-Perot (F-P) filter is analyzed,and the driving circuit of the filter is designed.In the experiment,a sawtooth wave is obtained by using a digital circuit,which is amplified by an analog circuit.Thus the duty cycle of the rising edge of the sawtooth wave can amount to 99.90%.And its frequency can be adjusted from 0 to 50 Hz.Both the amplitude of the output voltage and offset can be adjusted from 0 V to 30 V.To sample and search the signal and peak more easily,the applied voltage is rectified by using the cubic fitting algorithm in a free spectral range.Experiment results show that the standard error and the maximum error of the tuning wavelength are reduced by 62.7% and 80.1%,respectively.

Improved Design of Voltage Control Oscillation Subassembly

WEN Ying-Chun, ZHAO Su-Mei, ZHAO Jian

. 2012, 25(8):  20. 

Abstract ( 1121 )   PDF (496KB) ( 822 )  

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The principles of a navigation equipment's frequency synthesizer are introduced.To reduce the high malfunction rate of its voltage control oscillation subassembly,an improved voltage control oscillation is designed.In this design,the voltage control oscillation subassembly is implemented by an improved three-dot capacitance oscillation circuit.Its implementation method is presented.This voltage control oscillation subassembly has good performance,simple testing,stable output frequency and good reliability.It meets the performance index of the complete device and can replace the original voltage control oscillation subassembly.

Design for Testability and Power Optimization in SOC

CHEN Zhi-Qiang, LIN Ping-Fen, REN Wei-Li

. 2012, 25(8):  23. 

Abstract ( 1170 )   PDF (514KB) ( 815 )  

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This paper introduces the conception of DFT(Design For Testability) technology and test coverage with a PLC(Power Line Communication) chip as an example.An obvious adjustment has been made based on test coverage and power of the design.These optimization methods have greatly improved test coverage,reduced the cost and power consumption,and improved DFT quality.Finally,the design went on to mass production successfully.

Interconnected Signal Integrity Test Based on CJTAG

HUANG Feng-Cai, YAN Xue-Long

. 2012, 25(8):  26. 

Abstract ( 1425 )   PDF (714KB) ( 859 )  

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With the wide application of IP cores in the system on the chip,more and more interconnection bus has been used in the IP cores,leading to the problem of the signal dis-integrity.And the traditional serial scanning topology structure cannot satisfy the requirements of the development task of the test system.The IEEE 1149.1 standard proposed a TAP.7 interface standard that supports three topology structures.This paper gives a test method for the interconnected signal integrity based on CJTAG with emphasis on the design of the TAP.7 interface converter.Testing results show that this system has good application prospects.

Co-design of Frequency-Domain Anti-Jamming and Parallel Acquisition in DSSS LEO Satellite Communication System

CHEN Xiao-Ting

. 2012, 25(8):  29. 

Abstract ( 1640 )   PDF (561KB) ( 821 )  

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This paper introduces a high-efficiency co-design method for frequency-domain anti-jamming and parallel acquisition with FFT,analyzes such key problems as sample frequency,FFT calculation points,time-division reuse,etc.,and proposes a baseband processing structure for implementing frequency-domain anti-jamming and parallel acquisition high-efficiently in the DSSS LEO satellite communication system.

Analyzer of Transmission Performance for Digital Signals Based on FPGA

SUN Pan, YAO Jia-Yi, LIN Yue-Bin

. 2012, 25(8):  32. 

Abstract ( 1033 )   PDF (440KB) ( 830 )  

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The FPGA system analyzed in this paper has the digital circuit as its core.It is composed of the digital signal generator,low pass filter,adder,pseudo random signal generator and digital signal analysis circuit.The system scheme is compared and the circuit and software are analyzed and designed.To reduce the data rate error and pseudo random code error,eye and eye amplitude were measured.Test results show that error values are within the allowable range.

Anti-Jamming Technology for Chaff on the Sea

YAO Yuan, LIU Lei, ZHAO Li-Juan

. 2012, 25(8):  35. 

Abstract ( 903 )   PDF (767KB) ( 723 )  

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Due to the simplicity and low price of chaff,the chaff shell is frequently used in naval battles.Because the chaff shell can interfere with radar effectively,this paper studies the method of distinguishing the target of a fighting ship from Chaff Cloud based on the Spectral expansion effect of the chaff cloud.This method can effectively carry out the purpose of anti-chaff-jamming in naval battles.

Realization of a Distance Measuring Device with Multi Chains

LAI Jie-Peng, LV Bao-Feng

. 2012, 25(8):  38. 

Abstract ( 948 )   PDF (485KB) ( 826 )  

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Airborne Equipment has transformed from working for a single ground station to working for multi ground stations.If the slant-range P from 3 ground stations are measured,positioning and navigation can be achieved by the P-P-P positioning method.This multi ground stations scanning mechanism will be the development trend of DME.It is shown that this system can realize multi chain work and its performance is reliable.

Design of Signal Arrival Detection Based on FPGA

GUO Yong

. 2012, 25(8):  41. 

Abstract ( 850 )   PDF (539KB) ( 768 )  

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The signal reaches the detection technology in digital communications.It has been implemented on a Xilinx FPGA chip and applied in a high-speed data transmission system.Different testing methods such as the  artificial addition of noise and testing in practical applications show that the signal reaches the detection module and can fully meet the indicator of the virtual probability and missing probability.

Finite Element Analysis on Zigzag Transducers

WU Hao, LI Kai-Yu

. 2012, 25(8):  43. 

Abstract ( 1338 )   PDF (702KB) ( 735 )  

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This paper addresses an issue in energy harvesting that has plagued the potential use of harvesting through the piezoelectric effect at the micro-electro-mechanical systems (MEMS) scale.Effective energy harvesting devices typically consist of a cantilever beam substrate coated with a thin layer of piezoceramic material to resonant at the dominant frequency of the ambient vibration.The fundamental natural frequency of a beam increases as its length decreases,so that at the MEMS scale resonance occurs orders of magnitude higher than ambient vibration frequencies,rendering the harvester ineffective.Here,we propose a new geometry for MEMS scale cantilever harvesters with low fundamental frequencies.To this zigzag configuration,we proved it can decrease its resonant to ambient by ANSYS.

Design of Stepper Motor Control by Virtual Instrumentation via Serial Interface

JIANG Jing, WU Ben-Ke, GAO Jian, YUAN Zi-Jun

. 2012, 25(8):  46. 

Abstract ( 1319 )   PDF (677KB) ( 816 )  

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For convenient supply of driving signal to driving and controlling system of stepper motor and accurate positioning of controlling stepper motor,the paper analyses the signal line of a personal computer serial interface equipment special conveying,using Virtual Instrumentation LabVIEW Development Platform to program control the signal line of TxD and RTS supplying signal of  PC serial interface RS-232C This method avoids complicated text programing language,thus simplifying the process of devising program.The design of control system has been used in controlling fixed position of Hybrid two phrase stepper motor with good performance.

Implementation of Signal Sampling with FPGA

WANG Jian

. 2012, 25(8):  49. 

Abstract ( 912 )   PDF (655KB) ( 759 )  

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A high-speed sampling unit hardware realization based on FPGA is proposed,including the circuit design of data acquisition;the approach of high speed data transmission;the design of operational processor system and bus control system,and the VHDL program framework.The signal types are transformed by the sampler and then processed and stored with programmable gate arrays FPGA.Finally,the data of the sample unit is transmitted under the control of the whole system.

Design of the Handheld RFID Reader Network Interface

HUANG Li-Min

. 2012, 25(8):  52. 

Abstract ( 1169 )   PDF (708KB) ( 770 )  

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In order to meet the requirements of the RFID reader in different applications systems,this study develops a handheld RFID reader which has the MSP430F149 MCU as the core and has the embedded Ethernet network interface.This paper introduces the design method for the network interface in RFID reader which is constituted of MCU and the RTL8139 Ethernet controller,and achieves the handheld RFID reader's access to the internet network for data communications.

Design of the General Steady Circuit Analysis Platform

YU Mei-Ling, WANG Gui-Tang, ZHOU Qiang

. 2012, 25(8):  55. 

Abstract ( 993 )   PDF (828KB) ( 775 )  

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Much matrix calculation is usually needed in circuit calculation.Now computers have been widely used to assist circuit analysis and design.Using Matlab's powerful computation function and GUI interface development,the platform adopts a universal list method and achieves the function of automatic steady-state circuit calculation.Users don't need programming.They only need to input relevant information of a circuit and the platform can directly calculate each node voltage,branch voltage and branch current,and draw the various wave figures for users.The Platform provides an effective aid for steady-state circuit analysis,and it can be used in the teaching of analog circuits.

Power Quality Transient Signal Detection Based on Wavelet Transform

GUO Feng, WANG Gang, DONG Xiao-Jie

. 2012, 25(8):  59. 

Abstract ( 949 )   PDF (642KB) ( 780 )  

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A DSP-based power quality monitoring system is introduced.Modular circuits for signal conditioning circuit and phase-locked frequency multiplication are also given.According to the modulus maximum theory of wavelet transform coefficient and multi-resolution decomposition of the transient signal which have been collected by the monitoring system,it accurately achieves the detection of the transient signal.Finally,according to the wavelet transform of the signal collected based on MATLAB,the result shows that wavelet transform can accurately detect the point of mutation of the power quality transient signal and testify the accuracy and reliability of wavelet detection.

Transformer Vibration Signal Trend Prediction Based on EMD and Adding-Weight One-Rank Local-Region Method

WANG Feng, YUAN Jin-Sha, ZU Wen-Chao, LIU Lei

. 2012, 25(8):  62. 

Abstract ( 1083 )   PDF (924KB) ( 755 )  

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The transformer vibration signal has the characteristics of being non-stationary and non-linear.This paper proposes combining the empirical mode decomposition(EMD) with adding-weight one-rank local-region method to predict the trend of the transformer vibration signal.First,the vibration signal collected at the scene is decomposed by the empirical mode.Then the phase space reconstruction theory is adopted to determine the appropriate time delay and embedding dimension for each intrinsic mode function of phase space reconstruction.After that,the adding-weight one-rank local-region method is used to predict and merge the components of the vibration signal.The experimental results show that this method can accurately predict the transformer vibration signal's change in trends and effectively monitor the transformer's running state.

Moore Stripes Subdivision and the Differentiation of Direction Based on Mealy State Machine

QIU Jia-Hua, HU Yi

. 2012, 25(8):  67. 

Abstract ( 1467 )   PDF (618KB) ( 738 )  

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This article describes a way of Moore stripes subdivision and the differentiation of direction based on the Mealy state machine and described by the VHDL language.By this method,the state machine judges the change of the grating signal of the pre-processed circuit and then outputs the count pulse and direction signal.By an improved counting method the effect of the peak interference pulse on the count is avoided and the accuracy of the subdivision and counting is improved.

The Infrared Video Signal Acquisition and Processing System Based on High-Speed DSP

WANG Ming-Fei, XIONG Xian-Ming, DONG Da-Ming, ZHENG Wen-Gang

. 2012, 25(8):  70. 

Abstract ( 934 )   PDF (669KB) ( 814 )  

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The Infrared Focal Plane Array is widely used in every field.The infrared video signal has different needs in different areas,which leads to the complexity of the post-processing algorithm.The real-time performance needs to be effectively improved.To improve the system performance,this paper builds an infrared image acquisition and processing system based on TMS320DM642,analyzes the working principle of the infrared image acquisition and studies the way of improving the speed of signal processing.Experiment results show that the system is stable and reliable,and the image magnification algorithm based on the system meets the real-time requirement.The success of this experiment lays a foundation for the subsequent signal processing.

Synthesis and Applications of One-dimensional ZnSe Nanostructures

WANG Zhi, LI Fang-Ze

. 2012, 25(8):  73. 

Abstract ( 928 )   PDF (1121KB) ( 764 )  

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ZnSe as one of the most important Ⅱ-Ⅵ semiconductors has wide direct band-gap of 2.7 eV at room temperature,which is also a suitable material of Blue-light detector.One-dimensional ZnSe nanostructures  are synthesized and nanodevices based on these nanostructures have been intensively studied in the past decade due to surface-to-volume rations,quantum effect and unique physical and chemical characteristics.Recently,a wide range of nanodevices based on ZnSe nanostructure have been fabricated.In this paper,the synthesis of nanostructure and the applications of nanodevice based on nanostructure are presented.

Study of High Aspect Ratio Silicon Trench Etching Based on ICP

ZHAN Ming-Hao, SONG Tong-Jing, HUANG Hua, WANG Wen-Jing, CHEN Bo

. 2012, 25(8):  77. 

Abstract ( 1416 )   PDF (716KB) ( 1091 )  

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This paper introduces the basic concepts of the inductively coupled plasma (ICP) etching technique.On the basis of the STS multiplex ICP system etching machine,it describes the principle of the etching machine and the etching process.The silicon deep trench etching technology is analyzed.An optimization scheme is presented for such problems as footing effect,lag effect and sidewalls roughness.With lots of experiments,we have obtained the etching conditions for etching high aspect ratio silicon deep trench.

Simulation Model of Infrared Early Warning Satellite In Geosynchronous Orbit

GU Yu

. 2012, 25(8):  80. 

Abstract ( 964 )   PDF (521KB) ( 776 )  

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Space-based infrared early warning satellite detects the ballistic missile infrared plume through infrared sensor on powered phase,it could detect and track the ballistic missile target in the early time.With the higher orbit altitude,geosynchronous orbit satellite gets bigger detecting range,which makes it had been used widely and thought as the important research object in the system simulation.The paper describes the way to establish simulation model of geosynchronous orbit satellitedetecting and reduces target discover conditon and detect range calculate function of geosynchronous orbit satellite.It would help for some problems of the research of infrared early warning satellite,such as simulation and planning.

Analysis of Factors Influencing Si-C Film Making

WANG Peng

. 2012, 25(8):  82. 

Abstract ( 1111 )   PDF (617KB) ( 793 )  

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Silicon carbide (SiC) is viewed as one of the most promising and the most commercioganic semiconductors and widely utilized in optoelectronic devices.Growth of high quality silicon carbide (SiC) film,which have advantages in effectively solving perplexed problems existing in the film such as the self-compensation,intrinsic stress and impurity,plays a critical role in the application of SiC film,especially the application of microelectronic devices.Hence,the growth of high quality silicon carbide (SiC) film becomes the problem which needs to be solved immediately.For this reason,a lot of experiments have been done to find the contributing factor.This paper analyzes the factors influencing Si-C Film Making from the follow aspects:negative substrate bias,working and substrate temperature,working substance,RF power,operation gas pressure,Gr and the time of deposition.Then the growth rules of making SiC film is found.

Research on the Electron Characteristics of Carbon Nanotubes Random Networks Field Effect Transistors

CHANG Yong-Jia, HUANG Hua, HUANG Wen-Long

. 2012, 25(8):  86. 

Abstract ( 936 )   PDF (770KB) ( 902 )  

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The bottom-gate electrode is deposited on the Si substrate with electron beam evaporation method.Thin film of SiO₂ is grown on the bottom-gate electrode.The suspending liquid with single-walled carbon nanotubes (SWCNTs) which are fabricated by the commercial SWCNTs with ultra-sonic and dispersion procedures was spin-coated on the thin film of SiO₂.The drain-source electrodes were formed on the thin films of the SWCNTs by shadow mask electron beam evaporation.Too much chemistry contact with the SWCNTs is avoided by using this technology,and the properties of the SWCNTs are preserved effectively.The electricity performance of the CNT-FET device is tested at room temperature.The SWCNTs random networks thin film FETs had the advantages of steady performance,good repeatability and uniformity.This technique can be used for constructing logic circuits in CNTs,and provide valuable references for making research on large-scale and low-cost ICs based on CNTs.

Based on Interest Matching Network Optimization Method of Communication Research

LIU Wen-Xia

. 2012, 25(8):  90. 

Abstract ( 1292 )   PDF (684KB) ( 710 )  

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In traditional communication network due to channel jams,the redundant information interference factors,in the communication process there are a dislocation communication,time delay index higher,and network congestion probability big,network anti-destroying ability obvious defects.Design of a kind of communication strategy based on interest matching.According to the content of the information and communication node extract its latest features,classification.According to the classification results of routing protocol design,not only can achieve the best channel choice,and to transfer information features from and matching Angle,realize the fuzzy channel choice.Using simulation method to the index of network simulation analysis,prove that the proposed method has a certain advantages,for a new generation of communication protocol design to provide ideas.

Technology of Winding Roads Based on Wavelet Decomposition

DU Yu-Hao, ZHANG Ya-Qi, LI Jian

. 2012, 25(8):  93. 

Abstract ( 1077 )   PDF (624KB) ( 775 )  

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In order to ensure that vehicles go through winding roads safely and effectively,accurate identification of the bend curvature is particularly important.Therefore,this article proposes a technology of identifying winding roads based on wavelet decomposition.This algorithm collects the real-time road images with vehicle-mounted CCD.The wavelet of the collected images is then de-noised and its edge detected.Finally the lane's line is accurately identified.The curvature radius is determined through curve fitting.Experiments show that this algorithm can accurately identify the curvature radius of the winding roads.

Design of Mining Workers' Physiological Status Monitoring System

FENG Yu, LIU Jun

. 2012, 25(8):  96. 

Abstract ( 1067 )   PDF (879KB) ( 776 )  

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The mining workers' physiological status monitoring system is a system to realize real-time,continuous and long time detection of workers' ECG,respiration,body temperature,blood oxygen saturation and body movement and to realize wireless data transmission.In view of the lack of control of workers' status by traditional monitoring equipments and the high frequency of mine accidents,we have designed a set of wireless,wearable,and non-invasive multi-parameter physiological monitoring system to display the physiological status of mining workers accurately,to prevent dangers timely,and to achieve a smooth,safe completion of the mining task.

Studies on Intelligent Ramp of the Freeway Control Methods Based on the Fuzzy Logic Theory

LIN Tao, LIU Yang-Kui, CHEN Ke-Bin

. 2012, 25(8):  100. 

Abstract ( 1238 )   PDF (707KB) ( 774 )  

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Based on the dynamic model of the freeway traffic flow and in conjunction with the fuzzy logic theory,the ramp controller by using fuzzy logic is designed.The ramp metering rate is determined by the fuzzy control based on the density tracking error and the error variation.Simulation results show that the ramp controller is practical and effective.It can avoid traffic jams and improve the mainline passing capability.

Intelligent Coastal Waters Transportation System Based on AIS

ZHANG Ling-Xin, JI Ben-Shan

. 2012, 25(8):  104. 

Abstract ( 1138 )   PDF (606KB) ( 838 )  

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With the increasing application of the technology of the internet of things,the automation and intelligent level of coastal waters transportation management is improving continuously,and hence the merchant ship real time monitoring and management can be realized gradually.This paper discusses the design of a coastal waters intelligent transportation system by taking AIS(Automatic Identification System) as a data acquisition sensing unit of the internet of things.The advantages of AIS-based internet of things and the application prospects of the coastal waters intelligent transportation system are analyzed.The scheme is proved to be feasible.

Virtual Test Experimental Teaching System Based on LabVIEW

ZHENG Hong-Mei, MEI Jia-Hua, HAN Fang-Qiang

. 2012, 25(8):  107. 

Abstract ( 1615 )   PDF (1199KB) ( 869 )  

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This testing system is based on LabVIEW.This study covers signal generation,signal analysis and processing,and case studies.First,the structural frame of this system and the design procedure of main programs are simply summarized;then the installation steps of the PCI-9111HR DAQ card and virtual signal generator are explained in detail,and the functions of signal analysis and processing are described.Finally,two examples about the virtual instrument is given,and the design process and the results are analyzed.It is shown that this system can lower the experimental cost and improve utilization ratio.

Design of a Railway Track Wireless Monitoring System Based on the Magnetostrictive Transducer

LV Xian-Yao, ZUO Ying, CHENG Wei-Ping, LI Kai-Yu, WU Yin

. 2012, 25(8):  110. 

Abstract ( 1367 )   PDF (1222KB) ( 799 )  

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In order to ensure the safe and reliable operation of the railway system,this paper designs a new type of inverse magnetostrictive transducer which converts energy from the pressure of railway steel based on the layout conditions of monitoring nodes,and this transducer can meet the needs of nodes with its conversion efficiency reaching 32.6 mW.This paper also presents a railway steel pressure monitoring system based on CC2430+GPRS.The hardware and software design of the coordinator and RFD nodes are given.An intermittent network is established using double coordinators.Through the field experiments in a railway station,the largest single jump distance approximates 60 m,and the data transmission success rate is higher than 96%.This system can also balance the energy consumption of each node,effectively increasing its life.

Smart Home System Internal Network Based on Zigbee Technology

WANG Bo

. 2012, 25(8):  114. 

Abstract ( 1146 )   PDF (667KB) ( 862 )  

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In order to enhance the rapid deployment of the intelligent household system and to reduce the cost of construction,this paper presents a design scheme of the intelligent household system,in which the Zigbee wireless networking technology has been used to construct the basic internal network.On the basis of CC2430 radio chip and in virtue of some peripheral circuits,the scheme designs the hardware circuit of the terminal device and the Center Coordinator;according to the Zigbee stack,C language is used to design the communication application software for the terminal device and the Center Coordinator.

Copyright Protection Technology of Jingdezhen Ceramic Artistic Works Based on Digital Watermarking

FU Li, WANG Jun-Xiang

. 2012, 25(8):  118. 

Abstract ( 949 )   PDF (588KB) ( 696 )  

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In recent years,driven by interests,"Jingdezhen" and many other brands art porcelains especially created by the master of art have been subject to wanton theft and counterfeit.For this reason,this paper draws on the digital watermarking technology for the protection of the ceramics,especially the property protection of Jingdezhen ceramic artistic works.

Simulation of a High-speed PCB Board Based on Hyperlynx

LI Xiu-Juan, ZHU Jian-Feng, SU Xin, HUANG Chang-Bing

. 2012, 25(8):  121. 

Abstract ( 1057 )   PDF (1196KB) ( 751 )  

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With the development of electronic technology,the first priority for designers is to ensure normal working of high speed circuits.As a signal transmission carrier,the integral transmission of high speed digital signal on PCB board becomes a important indicator of the design.This paper analyzes the reason for and solution of crosstalk by the electromagnetic theory and tests the theory via global and crosstalk simulation of a PCB board.A comparison is made of different termination techniques and the best scheme is selected to decrease crosstalk to a reasonable degree.

Moving Object Tracking Algorithms Based on Video Sequence

LI Yang

. 2012, 25(8):  125. 

Abstract ( 908 )   PDF (568KB) ( 760 )  

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An algorithm for moving object tracking based on video sequence is introduced,which integrates Kalman filtering and Meanshift algorithm to realize fast-moving target tracking.Kalman filter predicts the possible position in the next frame,while the Meanshift algorithm locates the precise position of the Target.Actual tests show that this algorithm effectively overcomes the problem of missing target when the tracking target is moving fast,and that target tracking efficiency is improved significantly.

An Improved Algorithm of Routing Protocol Based on LEACH

CAI Yue-Jie, HU Fang-Ming

. 2012, 25(8):  128. 

Abstract ( 1293 )   PDF (640KB) ( 800 )  

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Due to the limitation of software and hardware of the sensor node,lifetime of Wireless sensor network (WSN) is limited,and the research of WSN routing protocol is one of the most effective ways to extend the network lifetime.LEACH protocol is a classical cluster routing protocol.This paper proposes an improvement based on LEACH protocol,applying K-medoids algorithms to improve the mechanism of the selection of cluster head.Simulation results have confirmed that the improved LEACH protocol is superior in extending network lifetime and equalizing energy wastage.

An Optimized Sampling Strategy of the Parameters Calibration for PCMM

XI Si, YU Lian-Dong

. 2012, 25(8):  132. 

Abstract ( 863 )   PDF (549KB) ( 595 )  

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We use the Gauss-Newton method to find the parameters in the parameters calibration for PCMM (Portable Coordinate Measuring Machine).Then we find the relationship between the identification of parameters and the conditions numbers of Jacobin Matrix,and in practical the conditions numbers of Jacobin Matrix depends on the sample point.Therefore,the sampling strategy must be optimized.Using the cone and standard bar as a calibration standard,this paper presents an optimized sampling strategy to increase the value range of each joint and thus minimize the conditions number of Jacobin Matrix.Experiment results show that the sampling strategy of calibration greatly improves the measurement accuracy.

Application of OPNET in Power Integrated Data Communications Network

ZHANG Hua-Fang-Zi, QI Yin-Cheng, WU Jun-Na, LIU Ming-Jun, YANG Di

. 2012, 25(8):  135. 

Abstract ( 925 )   PDF (790KB) ( 595 )  

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This paper analyzes the characteristics and modeling process of OPNET.Then it analyzes the structure of the power integrated data communications network and gives the simulation modeling process of how to use OPNET for it,including the establishment of the network,simulation of services and collection of statistics.Finally it gives the simulation results of network throughput,delay and responding time.The simulation results meet the design index.

Speed Regulator's De-saturation Overshoot Analysis Based on Multi-loop Control

XU Xian-Hong

. 2012, 25(8):  139. 

Abstract ( 739 )   PDF (374KB) ( 666 )  

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The causes of de-saturation overshoot of the speed regulator are analyzed.The speed and current are linearized for the preliminary work of the overshoot of the de-saturation.This paper also derives the theoretical basis for translating the overshoot by the typical type II system immunity indicators.It finally comes to several conclusions of practical value and can,therefore,be used as a guide in practice.

Application of Multisim10 to Digital Electronic Technology Fundamentals Teaching

CHEN Hai-Hua, WANG Han-Zhuo

. 2012, 25(8):  141. 

Abstract ( 1144 )   PDF (484KB) ( 653 )  

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The traditional teaching of Digit Electronic Technology usually limits students' understanding  of concepts and theories to the static state circuit so that they can not construct a concrete and direct viewing learning mode.This paper introduces a circuit analysis and simulation software Multisim into teaching.It designs and analyzes the priority encoder 74LS148 simulation circuit by the Multisim software.By Multisim,the structure,analysis,coding principle,and dynamic running of the simulation circuit as well as the analysis of the result are shown,which can help students further understand abstract concepts and theories and improves the teaching effect.

Technology for Automobile Fuel Tank Level Measurement

TONG Xin, HAN Cheng-Cheng, LU Yi

. 2012, 25(8):  144. 

Abstract ( 1092 )   PDF (567KB) ( 610 )  

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Based on a review of present measurement technologies of the fuel tank liquid level at home and abroad,this article analyzes several common methods and principles of the measurement of the fuel tank liquid level.The advantages and disadvantages of these methods are compared and their principles are discussed.The future trend of technologies of the liquid level is pointed out.

Study on Browsers Compatibility of Cascading Style Sheets

SONG Yu-Wei, LI Yin-Feng, JI Peng

. 2012, 25(8):  147. 

Abstract ( 1101 )   PDF (469KB) ( 683 )  

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This paper approaches the browsers compatibility problems of CSS from three aspects:browser,solution to compatibility problem and CSS debugging.First it introduces commonly used browsers,and then it enumerates some CSS browser compatibility problems and gives the solution.Finally it presents two common inspection tools for CSS:IETester and firefug.

A Survey on Semantic-based Video Retrieval Key Techniques

KONG Ying-Hui, LIU Shu-Rong, ZHANG Shao-Ming, FAN Qi-Yue

. 2012, 25(8):  150. 

Abstract ( 944 )   PDF (702KB) ( 1979 )  

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With the emergence of much video,video content retrieval becomes an active research direction in the multimedia applications.Most of the existing video retrieval technologies are based on low-level features.These features are quite different from the semantic concepts.It seriously influences the practicality of the video content retrieval system.The gap between low-level features and high semantics is difficult to narrow,so how to extract semantic concepts in the human thought from video is becoming a most challenging research of the video content retrieval.This paper introduces the background of semantic video retrieval and the latest and dynamic research at home and abroad,analyzes the advantages and disadvantages of the existing methods and summarizes the existing key technologies.

Summary of the Application of PLC in the Industrial Field

MA Wei-Zhong

. 2012, 25(8):  154. 

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The PLC is warmly received because of its mature hardware technology,cost-effectiveness,stable and reliable performance,simple development,and low maintenance cost.This paper describes the functions of PLC and Emerson EC20 series features.It also analyzes some typical applications of PLC in industry.Finally it summarizes the prospects of its development.