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Table of Content

15 November 2015 Volume 28 Issue 11
  
    Articles
    A Dynamic TDMA Protocol Utilizing Channel Sense
    BAI Ziyou,LIU Yunjiang,ZHOU Demin
    . 2015, 28(11):  1. 
    Abstract ( 527 )   PDF (855KB) ( 478 )  
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    A dynamic TDMA protocol (CS-TDMA) utilizing channel sense is developed to solve the great waste of channel source when traffic is not uniform between all of the nodes in the TDMA network.The CS-TDMA protocol is based on the TDMA protocol,and the node counts the number of packets from other nodes for estimating their traffic.When the timeslot is remainder,an ATS (access to send) message is sent to the busiest node,informing the node to send data until the timeslot is exhausted.Simulation results show that CS-TDMA protocol has better performance than TDMA protocol in the parameters of end-to-end delay,network throughput and message delivery.The advantage in delay is especially prominent when the traffic has a big gap between nodes.

    Research on PID Parameter Based on the Improved Genetic Algorithm
    ZHENG Quan,XIN Shangzhi,QIAN Jianqiu
    . 2015, 28(11):  5. 
    Abstract ( 559 )   PDF (675KB) ( 500 )  
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    Conventional PID parameter setting has the problem of low control precision and poor stability,which limits its applications in the systems requiring high precision and high reliability.Global optimal point can be found with the improved genetic algorithm(IGA) applied to parameter optimization of PID controller.The optimal solution is set to achieve the optimal effect of the steady state by using the PID controller with the addition of the improved genetic algorithm calculation module.Simulation shows that this method has better control performance with improved precision and fast convergence than the conventional PID parameters setting and optimization.

    Fast Algorithm for SAR Raw Signal Simulation with Large Squint Angles
    WANG Jinzhang
    . 2015, 28(11):  8. 
    Abstract ( 435 )   PDF (694KB) ( 482 )  
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    In this paper,a two-dimensional Fourier domain SAR raw signal simulation algorithm with large squint angles is presented. There exists serious coupling between azimuth and range for synthetic aperture radar (SAR) in large squint mode. It is difficult to simulate this coupling using traditional frequency-domain algorithm. Therefore,the geometric model of large squint mode SAR and reason of coupling are both analyzed. We modify the traditional frequency-domain algorithm to handle the large squint mode. The key of algorithm is to use a linear range cell migration correction to simulate the range-azimuth coupling. The results show that the algorithm improves both the computational efficiency and the simulation accuracy. Simulation results demonstrate the validity of the proposed algorithms.

    Pipeline Defect Identification Based on Wavelet Energy Coefficients and Neural Network
    JIANG Yinfang,GUO Huajie,CHEN Zhiwei,DU Bin,LIU Qiuge
    . 2015, 28(11):  13. 
    Abstract ( 571 )   PDF (817KB) ( 457 )  
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    The method wavelet energy coefficients combined with BP neural network is used to distinguish pipeline grooves from welds.A guided wave detection system was established,a set of test samples of pipeline grooves from welds were collected,and wavelet energy coefficients were extracted from test samples and applied to the training and recognition of BP neural network.Results show that the identification accuracy of pipeline defects of this method is high and stable with a minimum identification accuracy of 92% and 98% for weld and groove respectively,and a highest recognition accuracy of 100% in the 5 experiments on randomly chosen samples.

    T S Model Identification Based on an Improved Gravitational Search Algorithm
    DONG Xinyan,DING Xueming,WANG Jian
    . 2015, 28(11):  16. 
    Abstract ( 532 )   PDF (729KB) ( 493 )  
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    As the gravitational search algorithm plays a negative influence on the search accuracy of the complex issues,especially the poor search quality of standard Gravitational Search Algorithm(GSA) in the high dimensional function optimization,it is easy to get into premature convergence in the optimization process.An improved gravitational search algorithm based on genetic mutations(gmGSA) is proposed to identify the parameter of T-S model.An improved fuzzy c-means(FCM) based on simulated annealing(SA) and genetic algorithm(GA),denote as SAGA-FCM,is also proposed to identify the structure of T-S model.The simulation results show the proposed methods can effectively obtain compact and accurate fuzzy models with excellent capability of generalization.

    Design and Realization of Four-rotor Aircraft Hovering Algorithm
    DENG Bowen,DOU Qiang,GONG Guohui,DENG Lin
    . 2015, 28(11):  21. 
    Abstract ( 497 )   PDF (665KB) ( 587 )  
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    A four-rotor aircraft hovering algorithm is proposed based on external force balance and external torque balance.The momentum model of hover state is established using Newton-Euler equations,and with loop control is performed based on the PID control theory.The test results show that aircraft can drift within a horizontal range of ±2 m and a vertical range of ±1 m.

    Optimization and Compensation of PM2.5 Measurement System Based on the Improved Neural Network Control Algorithm
    ZOU Kongyu,TONG Guoxiang
    . 2015, 28(11):  25. 
    Abstract ( 730 )   PDF (734KB) ( 441 )  
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    An improved BP neural network PID control algorithm is proposed to optimize and compensate the PM2.5 measuring system for a better accuracy.Firstly,the velocity formula of particle swarm optimization algorithm is improved,then the improved PSO algorithm is applied to optimize the BP neural network to adjust the PID parameters online,and finally the improved PSO optimize BP neural network PID control algorithm and the traditional PID are simulated.The result proves that the improved PSO optimize BP neural network PID control algorithm can improve the accuracy of measurement with a reduced error compared with PID.

    Path Planning of Mobile Robot Based on Shuffled Frog Leaping Algorithm
    PAN Xiang,TANG Chunhui,ZHANG Renjie
    . 2015, 28(11):  29. 
    Abstract ( 535 )   PDF (871KB) ( 582 )  
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    To solve the problem of a method of path planning based on shuffled frog leaping algorithm is proposed to solve the poor search ability and stagnation in the mobile robot path planning.A certain number of paths are generated first in the grid map by the ant colony algorithm.Then,shuffled frog leaping algorithm is drawn in,and the worst frog updates its path according to the grids which intersect the paths of the best sub-group frogs or the global optimal frog.Finally,the generated path is optimized in order to eliminate unnecessary turning point and guarantee the moving safety of robot.Simulation under the two-dimension environment indicates that the proposed shuffled frog leaping algorithm can plan a safe and satisfactory optimal path quickly while avoiding obstacles effectively.

    Research on and Improvement of Capacity of DE Algorithm
    GUO Yanpeng,HU Wenlong
    . 2015, 28(11):  33. 
    Abstract ( 929 )   PDF (678KB) ( 417 )  
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    An improved algorithm based on the reversible difference expansion(DE) algorithm put forward by Tian is proposed by analyzing the ways that how the host image pixels' differences correlation influence the continuation of 0,1 of location map.The proposed algorithm takes advantage of the pixels' differences correlation to improve the efficiency of location-map compressing and to solve capacity limits caused by crude compression of location map.The experiment results show that the proposed algorithm can notably improve capacity with a improved location-map compression efficiency by ~ 35% and a PSNR by 1 dB on average.

    An Improved Method of Diagonal Decoupling for the VAV System
    GE Donglin,FU Dongxiang,ZHU Weiyun
    . 2015, 28(11):  37. 
    Abstract ( 518 )   PDF (731KB) ( 438 )  
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    The variable air volume has the characteristics of multivariable,strong coupling and delays.The traditional methods for the decoupling of the VAV are not effective.The paper corrects the decoupling controller further according to the traditional static decoupling method on the basis of the diagonal decoupling,achieving a better dynamic performance and robustness for the VAV of decoupling.A comparison with the method of simplified decoupling in the system of VAV is given.The result of Simulink shows the effectiveness and feasibility of the improved method.

    Physical Interpretation of Half Wave Loss of Mechanical Wave
    LI Cunzhi
    . 2015, 28(11):  41. 
    Abstract ( 456 )   PDF (533KB) ( 463 )  
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    The half wave loss of mechanical wave has confused the scientists for a long time.Although it has been proved by the mathematical method,the proof focuses mostly on the mathematical derivation and fails to offer a clearly physical picture.In this paper,the half wave loss of mechanical wave is explained by a physical method in terms of boundary conditions in order to give a clearly physical picture for it.The reflected wave and the transmitted wave caused by a fixed end and a free end on a string are also discussed.

    Research on Task Scheduling Algorithm In Cloud Computing Environment
    LI Hanyi,CHEN Jiaqi
    . 2015, 28(11):  43. 
    Abstract ( 565 )   PDF (967KB) ( 483 )  
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    There are large number of tasks in cloud computing environment,and how to conduct effective task scheduling is the key to allocate resources by need in cloud computing environment in order to be more efficient completion of task request.This paper proposes a task scheduling algorithm based on the ant colony optimization which an adapt to the dynamic characteristics of the cloud computing environment coupled with the advantages of ant colony optimization in the treatment of NP-Hard.The algorithm is designed to minimize task completion time during scheduling.Simulation on the CloudSim platform shows that this algorithm can effectively improve the task scheduling time under cloud computing environment.

    Improved K-means Algorithm Based on Density and Clustering Index
    MAO Xiu,MAO Chunli,DING Yuewei
    . 2015, 28(11):  47. 
    Abstract ( 545 )   PDF (849KB) ( 432 )  
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    The traditional K-means clustering algorithm initializing cluster centers randomly leads to the difference of clustering results.In the actual cases,it is difficult to give the exact number of clusters k to the algorithm in advance.In view of this,an improved K-means algorithm is presented based on density and clustering index.The algorithm generates the high density set named High Point(HP) according to all the objects' densities and chooses the mean of the furthest mutual distance two sample objects couples from HP as the first cluster's initial centers.The new initial center from rest objects in HP can be obtained by the maximum distances product algorithm.At the same time,the new algorithm automatically analyzes the clustering quality as the growth of the k values and determines the optimal number of clusters by selecting the index.Experiments show that the new algorithm achieves higher accuracy and validity.

    Research on Nuclear Material Level Meter Based on Long Plastic Scintillator
    GAN Xiaoyu,MI Yizhou,FENG Tingting,LIANG Cheng
    . 2015, 28(11):  51. 
    Abstract ( 465 )   PDF (832KB) ( 398 )  
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    A nuclear material level measurement system is introduced,which is based on the long plastic scintillator.According to the principle that the intensity of the rays attenuate after passing through substance,the height of the substance is determined by the change of the ray intensity.The hardware structure of the scintillation detector is analyzed.Both ends of the plastic scintillator counts decaying exponentially are summed.The both ends of long plastic scintillator with photomultiplier tube are used in the scintillation detector.The emitter follower and hysteresis comparator circuit increase the detection signal on load capacity,filter noise and discriminate signal.Relationship between the two ends signal of the detector and the relative position of the point-like radiation sources is established after the performance test results of HND-S2 plastic scintillator.According to the integration operation,the ideal model of the actual field of linear sources is determined,which is used to measure the height of the material level.The system has high measurement accuracy with an error of less than 1% and can be widely used in petroleum,chemical,pharmaceutical and other industries.

    Study of Interactions Between Delamination Damage in a Laminated Composite Beam and Ultrasonic Guided Wave
    XU Boqiang,LAI Kai,XU Guidong,XU Chenguang
    . 2015, 28(11):  55. 
    Abstract ( 566 )   PDF (1083KB) ( 413 )  
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    Based on the spectral finite element method(SFEM),a spectral finite element model is developed for a delaminated laminated composite beam coupled with a surface-bonded piezoelectric actuator/sensor.Ultrasonic guided wave excitation and propagation characteristics of the coupling system are researched by numerical simulation,and the interactions between the guided wave and the defect are analyzed.The composite beam is based on the Timoshenko beam theory and the piezoelectric wafer layer is represented by the Euler Bernoulli beam theory in the model.The beam/piezoelectric wafer coupled governing motion equations and the boundary conditions in time domain are obtained by using the Hamilton's principle,and then the spectral finite element model is formulated by transforming the coupled governing equations into frequency domain via the discrete Fourier transform.The high calculation efficiency and the ability of the present model to accurately predict the wave propagation in the composite beam are verified by comparing with the finite element method results.Then the interactions between the waves and the damage are discussed.The results show that the guided wave can generate reflection wave from the defect,and that the arrival time and the amplitude of the reflection wave are related to the location and the length of the defect.

    Study on Aspheric Lens Focusing System of Polygon Laser Scanning Beam
    YAO Hongbing,LI Yaru,GAO Yuan,YU Wenlong
    . 2015, 28(11):  61. 
    Abstract ( 477 )   PDF (915KB) ( 462 )  
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    This paper presents a focusing online drilling method of polygon mirror rotational scan a spherical lens to improve the production quality and reduce the production cost of laser drilling.The continuous beam emitted by CO2 laser is converged onto one of the upper surface of the polygon mirror via the optical modulator,and then the reflected light beams successively sweep into the focusing lens group.Since the linear distortion of focus spot,caused by off-axis aberration and the distortion of scanning speed,can lead to changes of the punch shape,aspheric focusing lens are used for beam shaping so that the shape of punch can be controlled by adjusting the shape of focus spot while focusing.The results show that the linearity error of scanning system can be controlled within 0.5%.This method improves the quality and efficiency of drilling compared with the conventional laser drilling methods.

    Design and Optimization of Network for a Rectangular LED Surface Light Source
    PANG Xiaofeng
    . 2015, 28(11):  65. 
    Abstract ( 568 )   PDF (856KB) ( 788 )  
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    This paper proposes a new light guide plate design with a rectangular side entering type distribution and arbitrary number of LEDs as the light source to reduce the times of backlight module revision of LGP network design,development time and cost in the actual production.The simulation model of the light guide plate is established using the TracePro software.The simulation diagram of illumination is obtained by inputting the theoretical calculation formula and the use of ray tracing function.The design of the preliminary theoretical calculation of distribution network is optimized by the optimization module of texture optimizer on the TracePro platform.A uniformity of 87% is achieved in the model with three LEDs as the light source,which is in line with national standards.

    Design and Implementation of an Elliptic Microstrip Low Pass Filter
    LI Chanjuan,FU Shiqiang,SUN Shuang
    . 2015, 28(11):  69. 
    Abstract ( 544 )   PDF (692KB) ( 532 )  
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    A compact low insertion loss and sharp transition band stepped impedance microstrip low-pass filter is designed based on elliptic function low-pass filter prototype to overcome the larger size and the slower transition band attenuation for the traditional microstrip low-pass filter.The size of the filter structure is calculated by some formulas and is simulated and optimized by simulation software ADS and HFSS.The final filter has been fabricated and measured.The measured results are in good agreement with the simulated ones.It verifies the feasibility of the design scheme.

    Application of Nomogram in the Design of Flyback Transformers
    RAO Junfeng,ZHANG Wei,LI Zi,LI Pan
    . 2015, 28(11):  71. 
    Abstract ( 483 )   PDF (794KB) ( 558 )  
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    It is very complicated to determine the size and type of the magnetic cores for the flyback transformers used in switching power supplies.Based on Nomogram,a simple method is proposed to choose the optimal magnetic core and determine the optimal parameters such as the swing of magnetic flux density,according to the work frequency and rated power.The efficiency is enhanced when using this method.A flyback transformer for a 24 V switching power supply is designed utilizing this method.The ripple voltage amplitude is measured to be 0.22 V,less than the required 1% of the rated voltage,showing that this method is feasible and practical.

    An S-band CDMA High Linear Power Microwave Amplifier
    SONG Junkui
    . 2015, 28(11):  75. 
    Abstract ( 524 )   PDF (740KB) ( 446 )  
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    This paper describes a solid S-band highly linear power amplifier by using push-pull configuration and broadside coupled lines power combiner.The push-pull configuration makes the amplifier easier to match,and the broadside coupled lines power combiner can handle high power.Accordingly the flat response of the amplifier's high linear output power is realized.Within 90 MHz bandwidth of the S-band,the amplifier provides a gain of 68±0.5 dB,a linear output power of 300 W,and an IM3 of the output signal ≤-45 dBc.

    Delayed Feedback Control in the Parallel-Connected Boost Converters
    JIN Aijuan,XU Dazhuang,CHEN Yi,MA Zhongxue,ZHAO Panpan
    . 2015, 28(11):  78. 
    Abstract ( 550 )   PDF (834KB) ( 451 )  
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    Under the peak-current-control of the current mode,nonlinear characteristics of bifurcation and chaos exist in the parallel Boost converter.To eliminate the phenomenon of the chaos in the circuit,a current-delay feedback control strategy is proposed.Based on the accurate discrete mode of the closed parallel system,iterative formulas are derived when the main circuit parameters of the parallel Boost converter change under the current-control mode.The chaos suppression ability and the robustness of current-delay feedback control strategy are verified by both Matlab simulation and the experimental results under different conditions.

    Analog Circuits Fault Diagnosis Based on LMD and SVM Algorithms
    QIAN Li,YAO Heng,LIU Jian
    . 2015, 28(11):  82. 
    Abstract ( 474 )   PDF (749KB) ( 482 )  
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    In the process of the fault diagnosis of analog circuits,feature extraction and classifier design are two critical aspects.Most methods classified fault circuit via support vector machine(SVM) or neural network using extracted time signals and wavelet transforms.A new algorithm based on LMD and SVM is proposed to improve the diagnostic accuracy.The signal can be adaptively decomposed into a series of one-component AM-FM signal(PF) through using the LMD algorithm.The features of the normal or fault status of the circuit can be extracted.The features are classified using SVM to achieve the diagnostic accuracy.The result of simulation shows that the method is effective in the circuits fault diagnosis with an accuracy >98%.

    Design of Voice and IP Data Wireless Optical Communications Link Based on Ethernet
    LIANG Luyang,MENG Wen,LI Yunxia,HAN Xiaofei
    . 2015, 28(11):  86. 
    Abstract ( 502 )   PDF (889KB) ( 559 )  
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    A system based on Ethernet and wireless communication link of laser transmission is designed for the directed communication between mobile application platforms carried a short distance.The electrical signals emitted by the Ethernet are modulated to optical wave over direct modulation.The modulated optical signals are focused to be the laser beam and then aligned to the receiving device;receiving device demodulates the collected signal and optical signals are restored into electrical signals.The electrical signals are sent to the reception side via Ethernet.This system can realize bi-directional high-capacity high-speed real-time signal transmission of voice,data,video and image signals with reliable communication quality,excellent privacy and security.Test results showed that the system can achieve high-speed data communication radio channel to meet the need for confidentiality between pairs of mobile application platforms.

    High-precision Temperature Measurement System Based on Constant-current Bridge
    GUO Shiping,ZHANG Rongfu,YU Hao,CHENG Jinguang
    . 2015, 28(11):  90. 
    Abstract ( 457 )   PDF (704KB) ( 655 )  
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    A high precision temperature measurement system based on low temperature drift precision voltage chip LT1083 low ripple of dc linear regulated power supply for power supply system and driven by constant current bridge three-wire system PT100 platinum resistance is achieved with analogue signals transformed into digital ones by the 16-bit high precision A/D converter AD7606 and sent to the STM32 microcontroller.The principles and the design of the constant-current bridge unit and signal conditioning unit,A/D conversion unit,and other function modules of the temperature measuring system are discussed and the linear error of the system is analyzed.The signals are converted into temperature by the STM32 algorithm.The experimental results show that the temperature measurement system offers stable and reliable performance with a temperature measuring difference ≤±0.01 ℃.

    Improved Maneuvering Target Display of Carrier-based Aircraft Taking Off and Down
    RONG Qing,YAO Peiyang
    . 2015, 28(11):  94. 
    Abstract ( 481 )   PDF (870KB) ( 451 )  
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    In the 3D display,real-time display of the maneuvering target has always been a research hotspot.A 3D real-time display system of aircraft's taking off and down based on the Unity3D is studied and realized to advance the result of 3D real-time display for highly maneuvering target with decreased display delay while ensuring the screen resolution for the network datagram driving based on Unity3D and Visual C+[KG-1.5mm]+6.0.Several key technique of 3D real-time display by network datagram driving based on Unity3D and Visual C+[KG-1.5mm]+6.0 are discussed,and the User Datagram Protocol(UDP) is employed.The implemental effect of the system is provided.The proposed system offers an effective measure of command and control system's 3D real-time display.

    An Isolation Safety Barrier for DC Power Supply
    ZHU Juxiang
    . 2015, 28(11):  98. 
    Abstract ( 556 )   PDF (679KB) ( 435 )  
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    Safety barrier is an important component of the intrinsically safe explosion-proof equipment.This paper implements a highly reliable isolation safety barrier for the transmission of dc power supply based on the reliable isolation transformer and its protection circuit.The detailed parameters and the key designs of the transformer and associated components of the barrier are given.This safety barrier fully meets EN60079 requirements of the intrinsic safety explosive-proof equipment.

    Application of Flow Field Analysis in the Design of Surge Tank Based on Fluent
    FAN Yaming,WENG Guohua,YUE Jian,FAN Zhihong
    . 2015, 28(11):  100. 
    Abstract ( 448 )   PDF (923KB) ( 432 )  
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    Based on an introduction to the structure of surge tank and characteristics of Fluent software,the application of Fluent in the design is proposed.The theoretical design and numerical simulation of the surge tank is discussed with an example to obtain the flow stability of the outlet location and verify the rationality of the design of surge tank.The result shows that the combination of traditional theory design with the calculation of fluid mechanics is effective.

    Application of Fuzzy Engineering PID Based on Adjustment Factors in Pneumatic Position Servo Control System
    QIN Qiusong,MAI Yunfei
    . 2015, 28(11):  104. 
    Abstract ( 487 )   PDF (1016KB) ( 466 )  
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    The existing algorithm for the high precision pneumatic position servo control is rather complicated,and it is so difficult to apply in engineering.An algorithm of fuzzy engineering PID based on adjustment factors is proposed using the normalized acceleration parameters to reflect the speed of the system response with a self-tuning mechanism for fuzzy engineering PID controller by introducing the variable universe algorithm.The adjustment factor is output according to the system error and normalized acceleration parameters to adjust the scale factor of the fuzzy PID controller and change the mapping relationship between the input and output of the fuzzy controller and fuzzy subset,thus improving the static and dynamic performance of fuzzy controller.The simulation and experimental results show that the algorithm proposed is simple and has a good control performance.

    Intelligent Control System of Solar Water Heater Based on Niagara Platform
    CAI Jiejie,WANG Yagang,SHEN Jin
    . 2015, 28(11):  110. 
    Abstract ( 986 )   PDF (742KB) ( 659 )  
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    The paper introduces an intelligent control system of solar water heater based on the Niagara platform.This system consists mainly of a Jace controller based on the Niagara platform,the solar heat storage plate,the water pump,the fan,and the heating device.The Niagara platform solves both the logic programming and the industrial remote control,thus realizing the industrial control networking function.Tests show the system can modify the logic and realize the smart control on equipment with an Internet connection available.

    Design and Implementation of Multipoint Atmospheric Pressure Data Acquisition System Based on ZigBee Technology
    ZHAO Kui,ZHU Niyao,XING Yangyang
    . 2015, 28(11):  113. 
    Abstract ( 490 )   PDF (671KB) ( 464 )  
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    An acquisition system for collecting multipoint atmospheric pressure parameter based on ZigBee technology is designed and implemented for real-time measurement of the atmospheric pressure at different heights.The network topology of ZigBee technology is studied from the perspective of applications.A tree wireless network with several nodes is built using the SOC chip CC2530 under the TI's Z-STACK protocol.Each terminal node and touting node can acquire the atmospheric pressure using the BMP085 sensor and send the data to the coordinator node through the network.Then the data are processed on the PC.The results show that the system obtains high precision data a small error.

    Design of Furnace Temperature Remote-monitoring System Based on Android Program
    ZHANG Wenkang,GUAN Hongyun,FAN Xiaoqing,YANG Ting
    . 2015, 28(11):  117. 
    Abstract ( 551 )   PDF (809KB) ( 473 )  
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    This article introduces an online remote-temperature monitoring system based on the Android mobile phone platform.The system adopts TI Corporation SCM MSP430F149 to convert temperature parameters with the built-in 12-bit A/D.The temperature data are transferred to the remote server via the serial port and the GPRS module,and then the Android mobile phone client receives the real-time temperature data.The system can achieve the functions of user management,temperature historic curve checking and real-time monitoring data checking.

    Design and Implementation of Web-based Real-time Monitoring Management System in Mechanical Workshop
    ZHANG Chao,ZHONG Liangwei,CHEN Caifeng
    . 2015, 28(11):  120. 
    Abstract ( 594 )   PDF (1095KB) ( 465 )  
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    A real-time monitoring management system in mechanical workshop based on Norm of working hour and Web technology is designed and achieved to solve the problems of disordered working ticket schedule,difficult quality trace,and redundant working hour statistics and so on.The basic functions and database structure of the workshop's management system in the whole ERP management systems are defined and realized through the analysis of the permissions for service personal and design of cooperative management with upstream order management system,downstream inventory management and financial management systems.The system has been implemented in a motor factory in Shanghai and is running well with reinforced staff information sharing and collaboration between and an improved working efficiency by 30%.

    Design of Vehicle Monitoring System Based on Mobile Terminal
    DONG Xiaolu,JIN Peng
    . 2015, 28(11):  125. 
    Abstract ( 554 )   PDF (642KB) ( 434 )  
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    This paper introduces a design scheme of vehicle monitoring system based on wireless transmission and its implementation.The system uses the main controller of the Bluetooth module as the carrier of information transmission with system data transferred in wireless way to the mobile terminal.Compared with the monitoring system of the same functions,the system is more intelligent and more convenient for users and realizes remote monitoring within the transmission range.The Freescale series single chip is chosen as the processor.The single chip microcomputer communication between the car and the Bluetooth chip is established with mobile communication terminals developed by the Android development tools.The effectiveness,stability and reliability of the proposed system have been verified in practical application.

    Design and Implementation of Document Management System Based on PDM
    SHAO Lian,ZHONG Liangwei,YUAN Kunkun,ZHANG Yang
    . 2015, 28(11):  128. 
    Abstract ( 468 )   PDF (967KB) ( 449 )  
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    A document management system solution based on PDM is proposed.The importance of document management in the enterprise market competition is expounded,a brief description is made about the PDM,and the basic system functions of and the database design are described in detail.A rapid design of products is achieved by collaborative design access analysis and document version management for user role to enhance the overall competitiveness of enterprises.

    Design of Integrated Management System of Intelligent Nursing Home
    HUANG Zhen,CHEN Zhuo,LIU Zhen
    . 2015, 28(11):  132. 
    Abstract ( 540 )   PDF (858KB) ( 442 )  
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    The pension problem in China is getting increasingly serious with fast growing old population of a large cardinal number subject to aging,disability,empty nest.An intelligent management system for nursing homes is designed based on IOS,Browser/Server structure using the MVC design pattern and Oracle Database to ensure the stability of the database access with the Spring Freamwork as the container.The front end presentation layer employs the JSF+Primefaces technology to enrich the operations control for easier user Operation.Practical test shows the system can effectively manage the various aspects of the elderly life,and improve the nursing home staff's working efficiency.

    HRSG Evaporator Parametric System Based on VB.NET
    LI Fusheng,SHEN Jingfeng
    . 2015, 28(11):  135. 
    Abstract ( 584 )   PDF (1101KB) ( 464 )  
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    It is difficult and inefficient to design HRSG evaporator by traditional design methods.The author summarizes the previous experience and builds the HRSG evaporator parametric system based on SolidWorks and guided by parametric design idea.The system develops the program with the vb.net using SQL Serve for data storage and management.The system greatly improves the efficiency and quality of the evaporator design.

    Pedestrian Detection Based on Co-occurrence Probability Feature
    JU Zhiyong,HUANG Kai
    . 2015, 28(11):  139. 
    Abstract ( 595 )   PDF (859KB) ( 574 )  
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    The human body target detection research is a research hotspot in the field of computer vision in recent years.In view of the poor pedestrian detection accuracy,this paper presents an efficient pedestrian detection algorithm.Different types of local features HOG and LBP are selected and filtered by the first stage Real AdaBoost algorithm,after which the co-occurrence probability features are generated by pairwise.Finally,weak classifiers are transformed into a strong recognizer to detect pedestrians through the second stage of the Real AdaBoost algorithm.Experiment in OpenCV and VS2010 shows that the algorithm can better detect pedestrian and improve the pedestrian detection accuracy and robustness compared with the OpenCV buit-in algorithm.

    Multi-focus Image Fusion Method Research Based on Shearlet Transform
    QIU Wanshan,HE Jianzhong
    . 2015, 28(11):  143. 
    Abstract ( 528 )   PDF (886KB) ( 432 )  
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    This paper proposes an image fusion algorithm based on the multi-scale multi-direction Shearlet transform to improve the performance of multi-focus image fusion.First,the Shearlet transform was used to decompose the registered original images,thus the low frequency sub-band coefficients and high frequency sub-band coefficients of different scales and directions were obtained.The coefficients of high regional energy were taken as the low frequency sub-band coefficients to yield the high frequency sub-band coefficient.The fusion coefficients are determined by the multiple discriminant method combining the regional energy and regional definition as well as regional variance.Finally,the fusion image is obtained by the inverse Shearlet transform.The results show that the subjective visual performance and objective evaluation index of this algorithm are superior to other fusion algorithms.

    Study and Application of Fuzzy Control in the Hydraulic Closed-loop Synchronous System
    LI Liangsi,HUANG Yiping,WANG Zhixiang
    . 2015, 28(11):  147. 
    Abstract ( 642 )   PDF (877KB) ( 491 )  
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    The hydraulic system controlled by the electro-hydraulic proportional valve has typical nonlinear and uncertainty.The precise dual cylinder synchronization control is difficult to achieve by traditional control methods.The fuzzy control is used in the double cylinder synchronous system to realize the adjustment of control parameters online based on the traditional control method,which improves the adaptive capacity of the system.The Matlab simulation results show that the fuzzy control reduces the displacement fluctuation range of double cylinder synchronous system and has perfect anti-jamming capability and stability.

    A New Method of Arrow Traffic Lights Recognition
    TIAN Jin,YING Jie,ZHU Dandan
    . 2015, 28(11):  150. 
    Abstract ( 547 )   PDF (812KB) ( 402 )  
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    A new method of arrow traffic light detection and recognition is proposed for the complicated traffic conditions of intersections.Intensity segmentation and morphological filtering are used to locate the traffic lights,then combined with the HIS color space and the relative position of the traffic light and the lamp board to confirm the color of the traffic lights.2D-Gabor Wavelets are used to extract the features of the candidate regions of traffic lights.PCA is used to compress the images,and ICA to further extract the feature of PCA.Finally template matching is used for classification.Experimental results show that the correct recognition rate of this method reaches 96.7%.

    A Saliency Map Segmentation Oil Tank Detection Method in Remote Sensing Image
    CAI Xiaoyu,SUI Haigang
    . 2015, 28(11):  154. 
    Abstract ( 461 )   PDF (849KB) ( 340 )  
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    Oil tank has been of great significance for both military and civilian applications.Its detection is an important application of remote sensing images.We propose a method based on saliency map segmentation distributed target detection and recognition for easier tank remote sensing image detection and higher recognition rate.The visual saliency model is adopted first to obtain suspected candidate depot area and the multi threshold Otsu method to segment the target;the circular and spatial distribution features of the depot are used for tank detection and identification;a priori knowledge of the scene by the distribution depot is employed to improve the detection and identification efficiency and reduce the false alarm rate.A large number of experiments show that this method can effectively realize the remote sensing images in the detection and recognition of the depot.

    Information Gathering in Vehicular Ad Hoc Network
    ZHAO Wenqiang,YANG Bailong,WANG Zhenghui
    . 2015, 28(11):  157. 
    Abstract ( 555 )   PDF (679KB) ( 367 )  
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    Vehicular Ad hoc Network(VANET) is a highly mobile self-organizing network,and it has three architectures:Vehicle-to-Vehicle (V2V),Vehicle-to-Infrastructure (V2I),and hybrid architecture.Due to the fast-moving and dynamic change in the topology of the VANET nodes,the collection of reliability,secure,and real-time data is a research hotspot.This paper discusses the data collection based on the on-board devices/sensor,the routing protocol,and extraction;analyses the characteristic of those methods and their future development;and finally compares the applications and performance the methods.

    Big Data Processing in Track Circuit Troubleshooting
    CHENG Jianyun,WEI Wenjun
    . 2015, 28(11):  161. 
    Abstract ( 490 )   PDF (964KB) ( 604 )  
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    Track circuit operation,maintenance and management of the process will produce massive heterogeneous multi-state data,that is,big data.Their efficient,reliable and inexpensive storage and quick access and analysis are currently an important research topic.The article first analyzes the characteristics of generation sources and track circuit failure detection in all aspects of big data,and reviews the current business,Internet and industrial monitoring large areas of the existing data-processing technique.A detailed analysis of these techniques in response to the track circuit troubleshooting and large data processing strengths and weaknesses is made.Finally the opportunities and challenges of big data track circuits are discussed in perspectives of large data storage,real-time data processing,heterogeneous integration of multiple sources of data,and large data visualization.

    Secret Image Sharing Based on the Mosaic Technique
    ZHAI Shengyun,MAO Qian,WANG Bing
    . 2015, 28(11):  166. 
    Abstract ( 604 )   PDF (828KB) ( 357 )  
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    The traditional method of the secret image sharing generates the noise-like image,which can attract the hacker's attention easily.To solve this problem,a method of creating the meaningful share image is proposed in this paper.Comparing similarity of the images,we obtain the mosaic images sharing the secret image into the target images.Then,the complete shadow images can be generated after hiding the position sequence of the image blocks into the mosaic images by the reversible information hiding technology.The shadow images obtained by the proposed scheme can avoid the attention of the attacker as well as restore the lossless secret image.

    Radio Frequency Identification System Security Issues and Prevention Strategies
    MA Zining,MA Yiming,WANG Shizhi
    . 2015, 28(11):  170. 
    Abstract ( 540 )   PDF (653KB) ( 371 )  
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    RFID technology is a on-contact automatic identification technology,which through radio frequency signal to identify the target and exchange the data.It can automatically collects data on commercial activities.RFID technology has a wide range of applications in the Internet of Things.However,in practical application environment,RFID face with problems and risks of information security and privacy aspects.Based on the aspects of security needs,subject to attacks and discuss solving strategies,this article from the technical level analyze the security issues of RFID systems and give some and propose some workable solutions strategy to reduce RFID system impact.

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