Table of Content

15 November 2012 Volume 25 Issue 11

  

Articles

The two Diagnosability of Hypermesh Network under the PMC Model

LI Gang-Ping, ZHU Qiang, GUO Yang-Yang

. 2012, 25(11):  1. 

Abstract ( 1016 )   PDF (529KB) ( 854 )  

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In this paper,we investigate the t-diagnosability and t/t-diagnosability of k-ary n-dimensional Hypermesh network,and prove that the Hypermesh network is n(k-1)-diagnosable for n≥2,k≥3,and ［2n(k-1)-k］/［2n(k-1)-k］-diagnosable for n≥3,k≥3 under the PMC model.

Research on Sensor Network Noise Filtering Based on the Linear Weight Algorithm

MA Jue

. 2012, 25(11):  5. 

Abstract ( 1466 )   PDF (558KB) ( 903 )  

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This paper proposes an adaptive linear weights algorithm for filtering the shot noise of sensor network.The algorithm first extracts the speckle noise characteristic parameters,and then linear iterative transform the parameters to obtain the closed adaptive weight parameters by calculation,thus implementing speckle noise filtering.Experimental results show that the algorithm can filter sensor network of the speckle noise with good results.

Research on Energy-efficient Wireless Sensor Network MAC Protocols

FU Xiang-Quan, SUN Zhi-Yi

. 2012, 25(11):  8. 

Abstract ( 1051 )   PDF (500KB) ( 910 )  

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Energy-saving design is the primary design objective of wireless sensor networks media access control protocols.The research results of MAC protocol are summarized,and some typical MAC protocols are analyzed such as S-MAC,T-MAC and etc.Studies show that introducing Topology control mechanisms to MAC protocols can reduce energy consumption further,and a new MAC protocol (GS-MAC) is introduced for wireless sensor networks,which can provides an effective mechanism for improving energy efficiencies by reducing the number of idle listening nodes.The simulation results show that energy can be saved further by this protocol.

Change Detection in Remote Sensing Images Based on the Fuzzy Clustering Algorithm and Artificial Bee Colony Optimization

JIA Cai-Jie

. 2012, 25(11):  11. 

Abstract ( 1314 )   PDF (804KB) ( 836 )  

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In order to overcome the local optimization of the fuzzy clustering algorithm,an artificial bee colony based on fuzzy algorithm combined with the global optimization of the bee colony algorithm is proposed for change detection in remote sensing.Ratio figure and difference figure fusion method is chosen to generate the difference image (DI),and then the fuzzy clustering algorithm is adopted to recover the changed and unchanged regions of the DI by constructing two clusters,where the artificial bee colony algorithm is introduced to avoid the local minimum problems of FCM and reduce the sensitivity of the initialization values of FCM.Simulation results show the new algorithm is more robust and efficient.

An Improved Method for Wavelet Threshold Signal Demonizing

ZHANG Xiao-Ning, SUN Li-Jun

. 2012, 25(11):  15. 

Abstract ( 1016 )   PDF (587KB) ( 808 )  

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In order to improve the filtering effect and the quality of denoising,this paper proposes a new denoising method for wavelet threshold signal processing.The method combines the characteristics of soft and hard threshold and optimizes the parameters for better threshold estimation.Through Matlab simulation,the proposed algorithm is compared with the traditional wavelet threshold,which shows that the proposed algorithm had better denoising effect and stability.

Fuzzy Synthetic Evaluation of the Sense of Happiness Based on the Entropy Weight Method

ZHOU Zhi-Heng, CHEN Ling-Ling, LV Ya-Qi, DING Ling-Li

. 2012, 25(11):  18. 

Abstract ( 1035 )   PDF (611KB) ( 753 )  

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Based on the Gounded Theory,the encoding process of the influencing factors of sense of happiness is presented.We encode 19 survey projects on different levels and determine the third level index proportion by the entropy weight method.The fuzzy synthetic evaluation model of happiness is constructed.The calculated happiness index is 3.255 7 (5 for the maximal value),which indicates that Internet users surveyed are relatively happy.

Ultra-Wideband Indoor Channel Model Simulation and Analysis

GAO Guang-Ya, WU Lin-Jun

. 2012, 25(11):  21. 

Abstract ( 1274 )   PDF (588KB) ( 939 )  

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The ultra-wideband indoor revised S-V channel model is simulated.Based on analyzing the parameter characteristics of the S-V channel model,the method for establishing the mathematical model for revised S-V channel model is researched mainly by simulation through matlab in the CM4 non-line-of-sight (NLOS) channel environment.The results show that the revised S-V channel model is closer to the actual channel with better channel impulse response characteristics than S-V channel,and are more suitable for the study on the propagation properties of ultra-wideband communication system performance.

Analysis of and Algorithms for Main Parts of Phonetic Features

SHAO Ze-Guo

. 2012, 25(11):  25. 

Abstract ( 831 )   PDF (468KB) ( 761 )  

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Taking finals of Shan groups features in 35 An Qing dialects for examples,this paper discusses first the concept of phonetic features' main parts analysis and its mathematic model based on Chinese dialects,and then presents an algorithm for automatically extracting phonetic features' main parts.

Protocol Settings of Communication System of Distribution Network Fault Detection

FU Wen-Bo, LI Feng, CAO Sheng

. 2012, 25(11):  28. 

Abstract ( 984 )   PDF (484KB) ( 799 )  

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In this paper,the wireless ad hoc network is used to achieve distribution network fault detection.Real-time online monitoring of the distribution network is achieved by installing wireless nodes to distribution networks.This paper simulated protocol of wireless ad hoc networks using the NS2 software to select the protocol for this system to improve system performance.A Comparison is made between end-to-end delay and packet delivery ratio under different number of nodes and the residence time of three protocols,namely DSDV,DSR,and AODV.Their throughputs under the basic access mechanism and RTS/CTS mechanism are also compared.Finally,the AODV protocol is chosen and the frame size threshold is set.

Wavelet Denoising Basaed on Improved Threshold Function and Adaptive Threshold

ZHOU Shuai, ZUO Dong-Guang

. 2012, 25(11):  31. 

Abstract ( 1228 )   PDF (599KB) ( 816 )  

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According to the theory of wavelet threshold denoising,a signal denoising method based on improved threshold function and adaptive threshold is put forward,which incorporates the advantages of hard and soft threshold functions,and makes up to some extent for the defects of traditional threshold denoising methods.The introduction of adaptive thresholding algorithm effectively saves the need to using the same threshold on each scale.Experimental results show that this method improves the signal-to-noise ratio and the denoising effect by overcoming the disadvantages of the poor denoising effect of hard thresholding and the distortion caused by soft threshold method.

Decipherment of Communication Protocol for Power-One Communication Power Supply Monitoring System

YU You-Cheng

. 2012, 25(11):  35. 

Abstract ( 1082 )   PDF (1333KB) ( 779 )  

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The communication information of Power-One communication power supply monitoring system is intercepted through the serial port trace tool.The logical reasoning and analysis to the communication information are conducted based on the general format of communication protocol of data link layer.The communication protocol format and various communication commands of Power-One communication power supply monitoring system are deciphered.The practical verification shows that the reasoning and analytical results are correct.It has a certain referential significance for the design and implementation of communication protocol of distributed monitoring system of China's communication power supply.

Research on Rainfall-induced Cross-polarization in Ku-waveband Satellite Communication

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

. 2012, 25(11):  40. 

Abstract ( 969 )   PDF (495KB) ( 757 )  

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The mechanism and effects of cross-polarization induced by rainfall in the Ku-waveband is discussed.Based on the ITU-R prediction model and parameters of the Ap-6,134 °E,Ku-waveband satellite,the cross-polarization attenuation quantity is calculated at 12 GHz with the rainfall data of Guangzhou,Nanjing,Changchun,and Xi'an.In order to compensate for the attenuation caused by cross-polarization,two polarization compensation networks are put forward with desirable effect.

An Efficient FPGA Implementation Structure of FIR Decimation Filter with High Orders

SUN Chong-Lei,WANG Da-Qing

. 2012, 25(11):  42. 

Abstract ( 944 )   PDF (613KB) ( 887 )  

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For the implementation of the FIR decimation filter with higher orders,many multipliers are required if the traditional direct or poly phase structure is employed.This increases the implementation difficulty in many practical systems.In this paper,an improved poly phase structure of the decimation filter is designed,which is more suitable for FPGA implementation.In the proposed structure,multi-channels and operations on sum of products are realized with only one multiplier by increasing the clock frequency of the FPGA.In a practical decimation filter system with 4 096-order filter and 512-order decimation ratio,the proposed filter module stably works at a clock frequency of 204.8 MHz and only requires 8 multipliers.

Study on the Cascade SS/QC-LDPC-MIMO Communication System

JI Lina,YANG Fengfan

. 2012, 25(11):  45. 

Abstract ( 943 )   PDF (726KB) ( 751 )  

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In MIMO communications,the reduction of inter-symbol interference and the impact of noise is very important a topic.In this paper,we first give a general MIMO communication system model diagram,followed by a simulation of the similarities and differences between the three different linear detection algorithms.Then spread spectrum technology and QC-LDPC channel coding techniques are cascaded at the input.The theory deduction and simulation results are given by comparing the relation between the cascade system and general MIMO system SNR and BER.The results show that the cascading reduces inter-symbol interference and noise,and is significantly better than the general MIMO system.

The PCB Circuits Design of the Communication of Electric Power Line

ZHONG Yingyi

. 2012, 25(11):  48. 

Abstract ( 851 )   PDF (726KB) ( 733 )  

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The complexity of transmission characteristic of low voltage power line and variability of interference signal makes its promotion limited.Based on the principle of high and low frequency circuit,contacting with modern communication and digital signal proecssing technique,This article describers The PCB circuits functions of the communication of electric power line,include amplifier,coupling,AGC system,etc.It solves the receiving and sending problem of the signal.

Angel Tracking and Error Analysis for the High Speed Data Transmitting Signal

ZHANG Yanxu,WU Tiezhu

. 2012, 25(11):  52. 

Abstract ( 808 )   PDF (616KB) ( 784 )  

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The article dissertates in detail the principles of tracking error signal modulation and demodulation of high speed data transmission.The simple design of tracking system is given and the major influencing factors of system performance are analyzed.

Design of an ARM-based Intelligence Home Trash Can

GAO Tonghui,GUO Rui

. 2012, 25(11):  55. 

Abstract ( 905 )   PDF (662KB) ( 751 )  

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The design takes the ARM11 S3C6410 as the core to realize a home intelligent trash can,which uses a pickup device as the sound sensor.It realizes real-time detection of sound source localization by delay estimating method,thus the voice control on the movement of the trash can.Infrared sensors are used to realize obstacles avoidance in the process of movement,and voice recognition technology to realize the identification of voice instructions of different directional movement or the closing/opening of trash can lid.This Intelligent and humanized of the trash can facilitate domestic lives.

Hybrid MoM-PO Method for Wire Antennas Mounted Near Combining Conducting Objects

YU Lijuan,LI Jianjun,DU Wenquan

. 2012, 25(11):  59. 

Abstract ( 731 )   PDF (683KB) ( 727 )  

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A hybrid MoM-PO method is proposed to analyze the EM properties of wire antennas mounted near combining conducting objects with the wire antenna modeled by narrow strip configuration.The RWG basis function is used in the whole area,and no more other basis functions are necessary,which simplifies the formula derivation.The calculation equations are deduced.Finaly,numerical examples are given to show the accuracy and efficiency compared with the results of FEKO and MoM.

Design for Manufacturing of Electronics PCB

XU Yaoshan

. 2012, 25(11):  63. 

Abstract ( 843 )   PDF (712KB) ( 750 )  

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Electronics PCB Design For Manufacturing (DFM) is in the product design with careful consideration of the production processes,facilities,equipment performance and the ability to process characteristics of product design production adaptability.Design for Manufacturing can improve the production efficiency and quality of products.This paper summarizes the practical production experience to provide guidance for electronic product design personnel and higher vocational technology college product design teaching.

Wireless Data Transmission System Based on SIM900A and LPC2378

JING Shiyong,ZHOU Jinglong,LIU Mingxin,YANG Ting

. 2012, 25(11):  66. 

Abstract ( 1131 )   PDF (654KB) ( 815 )  

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The paper presents a wireless communication system based on GSM/GPRS communication module SIM900A and LPC2378 controller.Remote real-time wireless data transmission can be realized by SMS,which greatly reduced the cost.The implementation method of system hardware and software design is given.

Conversion of GPS Coordinates Based on the ArcGIS Engine

ZOU Bo,FU Mincang,WANG Wei

. 2012, 25(11):  69. 

Abstract ( 1486 )   PDF (878KB) ( 16849 )  

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In GPS positioning applications,we need to display the location data received by GPS equipment on the electronic map in real time.This article describes the coordinates of the conversion process between the WGS-84 coordinate system and the Beijing-54 coordinate system and the seven-parameter transformation model parameters solution method.Based on the method of Project of IGeometry interface of the ArcGIS Engine Embedded development components and combining VisuaI C# and Visual Studio 2008,we develop the GPS positioning system with good adaptation and convenience,which meets the conversion precision requirements in practical uses.

Design of an Atmospheric Pressure Altitude Watch

YANG Yunfeng

. 2012, 25(11):  72. 

Abstract ( 880 )   PDF (365KB) ( 824 )  

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A multi-functional and portable wrist altitude watch is designed for outdoor sports fans,such as mountain and rock climbing.Besides the timing and LCD display functions of ordinary electrical digital watches,this watch also provides real-time altitude of the current position whenever and wherever the user is.Based on the special algorithm for the process of atmosphere pressure and altitude data of the four measurable mode exchanges of the micro pressure sensor SCP1000-D11 from VTI company in Finland and low power consumption design of software and hardware,this watch is warmly received in practical applications.

Analysis of the Effect of Power Harmonics on Electric Energy Metering

ZOU Yongjiu

. 2012, 25(11):  74. 

Abstract ( 935 )   PDF (486KB) ( 779 )  

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The power meter is a major energy metering tool.Its metering accuracy is of great importance to the accuracy of energy metering.This article discusses the harmonic generation,hazards and its influence on the induction watt-hour meter and electronic energy meter measurement in an attempt to seek a new method for reducing the effects of harmonics in energy metering.

Vehicle Speed Detection Method Based on Battery Pulsating Voltage Measurement

ZHANG Shuai

. 2012, 25(11):  76. 

Abstract ( 1101 )   PDF (500KB) ( 747 )  

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With the continuous upgrading of auto manufacturing technology,the new automobile engine is very compact in structure,which makes it difficult to directly approach the automobile engine ignition coil part,so the traditional vehicle speed detection through ignition pulse fails to meet the present measurement requirements.By theoretical analysis,the speed of automobile generator and engine are correlated,the output of the generator are three phase voltages,through a bridge rectifier connected to the vehicle battery,and getting the terminal voltage signal from the car cigarette lighter is a simple operation.Multistage band-pass filter circuit is used to realize weak electrical signal noise filtering and voltage amplification,after which the fast discrete Fourier transform is employed to realize real time signal spectral analysis to obtain the frequency related to the car speed for calculating the speed of automobile engine.

Intelligent Charge of and Strategic Research on Lead-Acid Battery in Electric Vehicle

CHEN Hao,GUO Lijin,LI Hui

. 2012, 25(11):  79. 

Abstract ( 1187 )   PDF (533KB) ( 710 )  

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In order to improve the lifetime and cruising capacity of lead-acid battery in electric vehicle and realize efficient and fast charging,an intelligent charging system is designed.In hardware design,a DC/DC forward converter is used to realize power conversion,a singlechip acts as the core of intelligent control and DS18B20 is employed to collect battery temperature.In software design,a new control strategy is put forward which combines the graded fixed current with plus-minus pulse.By modular design method,software for each function module is designed and the digital PI algorithm is applied to realize graded fixed current.The experiments show that the new control strategy used in the intelligent charger during the charging process can reduce the charging time and improve the charging efficiency.

Research on and Implementation of DC Location Detector in Distribution Network

ZHANG Xin,LI Baolan,CAO Sheng

. 2012, 25(11):  82. 

Abstract ( 865 )   PDF (627KB) ( 883 )  

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In distribution network fault location,the existence of the cement pole earth fault and the effect of wire distribution capacitance make it difficult to locate by the C type traveling wave method and the AC signal injection method.DC signal injection method works in time of line power failure,by which a DC signal is injected into the fault for the maintenance personnel to detect the DC signal by holding a DC signal detector along the road to determine the specific location of the point of failure.The principle of the DC signal detector and composition are described,and the injection of the DC signal is simulated.Simulation results prove the feasibility of our method.

Modeling of the Online Cafeteria Reservation System

TANG Lijun

. 2012, 25(11):  85. 

Abstract ( 826 )   PDF (876KB) ( 760 )  

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Based on the Unified Modeling Language (UML),an online cafeteria reservation system is analyzed using object-oriented analysis,and the demand models,basic models and auxiliary models of the system are built with the Rational Rose modeling tool.The practical modeling using UML shows that the UML can reduce the workload of software designers and facilitate development practice.

Invulnerability of Wireless Sensor Networks Evaluation Based on the Number of Shortest Way

WANG Xin,LI Bin

. 2012, 25(11):  88. 

Abstract ( 601 )   PDF (520KB) ( 685 )  

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This paper discusses the available methods of average equivalent shortest way for evaluating the invulnerability of common networks.This method is applied to the assessment of the invulnerability of clusters whose main duty is to deliver date.Then the available of each cluster is used to measure that of the whole networks.Finally,this paper studies the invulnerability of the wireless sensor networks based on the small-world model.The simulation indicates that this method is more objective and accurate in assessing the invulnerability of wireless sensor networks.

License Plate Identification in Complex Weather Conditions

LI Xinyu,YANG Yanjing,SHU Chang

. 2012, 25(11):  91. 

Abstract ( 1540 )   PDF (866KB) ( 856 )  

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In complex weather conditions,the distortion of the license plate imaging caused by the fog or glare makes it difficult to accurately identify plate information by the traditional image-based license plate identification method.By the Dark Channel Prior proposed by He Kaiming and histogram equalization method,the interference caused by weather conditions can be effectively eliminated,followed by image restoration and correction by morphology method,and finally,the license plate information can be recognized accurately based on the BP neural network.Experimental results show that the restored license images are clear and the recognition effect is good under the bad weather conditions.

Application of the Scheduling Switch Dual Machine in the Same Group in Hechi Grid

LI Yongdong

. 2012, 25(11):  95. 

Abstract ( 995 )   PDF (869KB) ( 726 )  

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With the continuous development of power grid,dispatching exchange equipment has become an important part of electric power system.Two-machine in One Group can share the scheduling information of different dispatching exchange,and it can also realize the redundancy and backup from the dual platform scheduling system,which greatly improves the reliability of dispatching system.In view of the current Hechi grid dispatching system running status and problems,this article proposes the technical solution of Two-machine in One Group in Dispatching Exchange,which has greatly improved the Hechi grid dispatching and communication system reliability.

Conflicts Prevention in Robots Communication

XIA Hui

. 2012, 25(11):  98. 

Abstract ( 1361 )   PDF (910KB) ( 782 )  

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In simultaneous communication between PC and lower position machines in large DCS equipments,the DCS PC may receive multiple instructions from several machine controllers at the same time,forming conflicts in the time domain signals thus lowering the success rate of communications between the DCS system PC and terminals.In order to solve this problem,this paper puts forward a large DCS equipment PC communication error elimination method.The algorithm takes advantage of a free time interval of effective filling method and the signal communications mechanism to solve the PC and controller conflict in time signals.Signal prediction testing technology is used to adjust the next time in advance to reduce the possibility of a conflict.The experimental results show that in large DCS systems this method can coordinate well the communication between PC and control terminals thus improving the success rate of multi-robot communication.

Target Detection Method in Case of Objects Integrating into the Background

PENG Jieli,LIU Yan

. 2012, 25(11):  102. 

Abstract ( 905 )   PDF (880KB) ( 746 )  

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When moving objects move into the background image,and then keep still,they become part of the background image.The traditional methods use the weighting of the current image and background image to get a new background image,which updates slowly so that the impact of objects can not be eliminated quickly.This paper presents a combination of the frame difference method and background subtraction method for moving object detection,by which moving objects are detected successfully and the scope of application of the moving object detection method is expanded.

Research on Traitor Tracing Technology

HAN Jinsen,ZOU Tao,ZHANG Longjun

. 2012, 25(11):  105. 

Abstract ( 1109 )   PDF (714KB) ( 713 )  

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Traitor tracing technology is one of the hotspots in information security field in recent years.This paper expounds the significance and necessity of traitor tracing,introduces the concept of traitor tracing and the basic model of scheme,analyses several typical schemes through a comparison of their advantages and disadvantages,and finally discusses the future trend of this research.

Mobile IP Registration Protocol with ID Fast Anonymity

DONG Bo,WANG Baocang,WEI Wenjia

. 2012, 25(11):  109. 

Abstract ( 885 )   PDF (496KB) ( 701 )  

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In view of the anonymous authentication and certification problems in the mobile IP registration,a mobile IP registration protocol with ID anonymity rapidly is proposed.The security of the protocol is based on the elliptic curve CDH.Temporary IDs varying with each registration guarantee anonymity and intractability of the true ID.

Data Recovery Technology Based on the FAT32 File System

TP309.3

. 2012, 25(11):  112. 

Abstract ( 1713 )   PDF (339KB) ( 685 )  

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This paper presents the data recovery methods in the FAT32 file system in case of hard disk data loss due to accidental misuse.A detailed description is given of the structure of the FAT32 file system and file storage features with emphasis on the principles of the FAT32 file system data recovery.The specific methods and processes of data recovery are described in detail.

Practical Methods for Weapon System Software Support

SHI Hongying

. 2012, 25(11):  114. 

Abstract ( 644 )   PDF (849KB) ( 971 )  

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Weapon System Software is playing an increasingly important role in modern weapon equipment systems.As Software Support has its own characteristics,software support is different from traditional weapon support.In this paper some practical methods for weapon system software support are put forward.

Research on Python-based Web Scraping Technology

QI Peng,LI Yinfeng,SONG Yuwei

. 2012, 25(11):  118. 

Abstract ( 1118 )   PDF (575KB) ( 769 )  

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In this paper web scraping technologies are discussed.The advantages of Web data collection technology for high speed and accuracy conversion of unstructured data into structured data are pointed out.The principles of the web scraping at HTTP level are introduced with emphasis on the technical solutions to Python-based web scraping.Web scraping system consists of two modules:HTTP interaction module and data analysis module.

Review of Studies on Game Analysis of China's E-Commerce Credit Problems

HU Weixiong,WANG Chong

. 2012, 25(11):  121. 

Abstract ( 962 )   PDF (705KB) ( 787 )  

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Credit problem is the biggest problem of e-commerce because of its particularity and the game theory has strong ability to explain the e-commerce credit.It is a hotspot to discuss the e-commerce credit with the principle of game theory.Firstly,the general situation of the research in the field of game analysis in domestic e-commerce credit problem is introduced.Then a summary is presented of the four e-commerce models:B2B,B2C,C2C and groupon.Finally,strategies for solving the e-commerce credit problem are proposed on the basis of the principles of game theory.