Showing papers in "Modern Electronics Technique in 2010"

Secure On-demand Routing Protocol for Ad Hoc Network

Abstract: The security issue of the ad hoc network has attracted the attention of people.Therefore,the security of the routing protocol for the ad hoc network is the key problem.A secure ad hoc on-demand routing(SAOR)protocol suitable for ad hoc network is proposed,which uses the session key between pairs of mobile nodes and message anthentication code based on hash function to verify the validity of the route discovery and route replies.By binding the MAC address with ID of every node,the various complex attacks such as wormhole attacks are defended by the proposed neighbor-node maintenance mechanism.NS-2 simulation results show that SAOR can effectively detect and thwart most of attacks upon MANETs(mobile ad hoc network).

Total Dose Effects in Modern Integrated Circuit and Hardening Technologies

Abstract: Along with the development of nuclear technology and space technology,more and more electronic equipments are used in all kinds of radiation environments.Two important radiation environments,the mechanism of total dose effects for integrated circuit,including the generation of electron-hole pairs,oxide trapped charge and interface traps are introduced.The advantages and application foreground of advanced technology are discussed,as dielectric material,HfO2 has a wide foreground,and in future the smart-cut material would become the SOI mainstream material.

Comparison of Image Amplifying Method

Abstract: Image amplification is one of the basic image processing operations,which is applied in people's daily life more and moreThe choice of image amplifying method directly affects its qualityIn order to choose the best method,the characteristics of nearest neighbor interpolation,bilinear interpolation,bicubic interpolation,cubic B-spline interpolation and fractal interpolation,wavelet interpolation,partial differential equations interpolation,exchange field interpolation are analyzed according to the principle of different image amplification algorithms,and their advantages and disadvantages are comparedThe method on how to select different algorithms according to various image features in order to achieve optimal results is pointed out

MPPT Strategy of PV System Based on Adaptive Fuzzy PID Algorithm

Abstract: To further improve the control quality of photovoltaic generation MPPT system, dual-mode adaptive fuzzy PID control strategy was proposed in this paper. On the basis of conventional fuzzy tracking algorithm, the principle of control algorithm was analyzed and the control system was designed. The results show that dual-mode control algorithms can quickly sense the changes in the external environment, and track the maximum power point rapidly. At the same time, oscillation phenomenon near the MPP is eliminated effectively. The proposed MPPT system represents good stability, accuracy and rapidity.

Street Light Energy-Saving Control System Based on Zigbee Network

Abstract: For the design of street light energy-saving control system,the research of network framework and Mesh network is performed with a networking Program Based on Zigbee technologyThe hardware platform for the monitering of the system's terminal node was designedThe software of Zigbee protocol stack was writtenThe characteristics of Mesh networks are introducedThe system realizes the Mesh network and Ad Hoc Network routing algorithm in a simulation experiment for the street lightsIt has improved the stability of the system and meets the communication requirements of energy-saving lamps

Design of Data Acquisition Program Based on Queued State Machine in LabVIEW

Abstract: Data acquisition is a bridge that connects the computer and the outside physical worldThe data acquisition system based on LabVIEW has advantages of short design period,easily extended function,low cost,remote and so onThe queued state machine improved by Anthony Lukindo is introduced,and a DAQ system builds on this architecture,achieving the function of multi-channel real-time data acquisition,data store,data analysis and display and so onFinally,the advantages of DAQ system based on queued state machine are summarized

Elementary Analysis on Vertex Tracking of X-Y Type Antenna Pedestal

Abstract: It is necessary to solve the technical problem of vertex tracking so as to that earth station antenna can track resource satellite and other special purpose satellite without blind area in the whole course.The vertex tracking principle of X-Y type antenna pedestal and the mechanism of produced blind area are analyzed by mathematics reasoning methods in detail.The vertex tracking of X-Y type antenna pedestal is investigated by derived maximum tracking angle rate,tracking blind area of X-Y type antenna pedestal and its relationship through round orbit satellite.The method of tracking blind area avoidance in the working area is presented and validated by engineering practice.

Design and Realization of Temperature Transmitter Based on Pt100 Platinum Thermal Resistance

Abstract: A three-wire Pt100 temperature sensor is designed and analysed aiming at temperature measurement of air compressor′s special inverter system.Using resistance and temperature function of Pt100 platinum thermal resistance,converting the temperature signal into a voltage signal,amplifying voltage signal through two-stage amplifier circuit and then converting the voltage signal into standard current signal output.In the A / D acquisition,using precise current and voltage conversion chips,converting current signal into standard voltage signal.The practice proves that the sensor has high stability and flexibility,is easy to achieve and has good performance,low cost.

Matlab Simulation Analysis of Power Spectrum Estimation Based on Welch Method

Abstract: The paper mainly introduces the principles of Periodogram method of classical PSD estimation,analyzes the deficiency of Periodogram method in theory,and makes use of Welch to amend Perodogram methodBy the use of simulation in Matlab,the impacts of different window function and different lenghth of data on estimation quality of Welch are discussed and the reasons of the impacts are analyzed

Image Segmentation Based on Genetic Algorithm

Abstract: Genetic algorithm is an optimal solution method of using natural selection in biological evolution and biological evolution in genetic mechanismGenetic algorithm has many advantages such as robustness,parallel,adaptive,and fast convergence,can be used in the field of image processing to determine the threshold valueImage segmentation is one of the objects of image processing,it is meaningful to the image feature extraction,image recognition and other image processing technologiesThe image segmentation effect based on genetic algorithm of using MATLAB software to simulate the different image segmentation algorithms and compare the resultExperiments indicate that the genetic algorithm is outstanding to deal with the image segmentation,the results is more outstanding than traditional image segmentation algorithm

Control System for Domestic Small-scale Environment

Abstract: As the demand on environment is needed strictly in current daily life,a control system,which takes AVR microcontroller as controlling core,adopts the sensors to detect indoor conditions,and utilizes the cooling films,humidifiers and other equipments to change the indoor temperature,humidity and illumination,is proposed.The purpose to control the indoor environment has been realized by the system which configurates a keyboard and display screen to set and show the values of the indoor environment according to the specific environmental requirements.The system has the advantages of lower cost and more powerful functions in comparison with similar systems on the market.The satisfactory result was obtained in practical test of the system.

Study of SIFT Feature Extraction Algorithm Based on GPU

Abstract: The traditional SIFT algorithm realized by CPU has low processing speed,whose real-time processing performance is difficult to obtain.The SIFT feature extraction algorithm based on graphic processing unit(GPU) of compute unified device architecture(CUDA) from NVIDIA corporation,which optimized the data storage structure and enhanced the data accessing efficiency.Experimental results show that the GPU-based SIFT feature extraction algorithm takes full advantage of the parallel processing ability of the GPU,whose calculation speed is greatly improved and nearly 20times speedup rate can be acquired for an image with the resolution of 1 600×1 200.By virtue of GPU,the real-time processing ability of SIFT algorithm can be greatly improved in practical application.

Gait Recognition Based on Joint Angles

Abstract: A gait recognition method based on joint angles is proposed according to the view point that joint angles of motion body contain rich identification information of individuals.The lower limbs,coordinates of pelvis,knee joints and ankle joints were computed with motion analysis according to the knowledge in body anatomy,The included angles of lower limbs are extracted as the angle of the moving joints.Considering low classification capacity of traditional gait classifiers such as NN and KNN classifiers,the support vector machine(SVM) which has an effective classifying ability for small sample was used for the gait classification.The experimental results obtained from CASIA gait database demonstrate that the approach has an encouraging recognition performance.

Water-saving Irrigation Control System Based on Wireless Sensor Network

Abstract: In order to improve the utilization of irrigation water,and ease the growing tension of water conflicts,a water-saving irrigation control system is introduced,which integrates the ZigBee wireless sensor network technology and GPRS network,designs wireless nodes based on CC2530.The system,which is controlled by single chip microcomputer has four major components: wireless sensor nodes,wireless routing nodes,wireless gateways and control centers.It can be real-time moni-toring of soil temperature and humidity changes,and it is based on soil moisture and crop water law for precision irrigation.The system automatically controls water based on crop irrigation water,which can help to improve the utilization rate of agricultural irrigation water and the low level of automation of irrigation systems.

Design of Surface EMG Acquisition Instrument Based on Embedded Technology

Abstract: A design of surface electromyography(sEMG)acquisition instrument based on embedded technology is proposedThe instrument equips AT91SAM7SE512 microprocessor as its main controller,contains many other components such as sEMG amplifiers,AD convertors,LCD display with touch screen,USB cable transmission,Xbee wireless transmission and data storage deviceIt utilizes the μC/OS-Ⅱ operating system and μC/GUI,and has stable performance and friendly operating interfaceAt the same time,for convenience of the user data and sEMG data management,FATFS file system is transplantedThe design of low power consumption and miniaturization improves portability of the equipment and it is beneficial to increase the utilization rate of sEMG acquisition instruments in the athletes training

License Plate Recognition Based on BP Neural Network

Abstract: The administrative system of the intellectual traffic is a development trend of traffic administration in the 21st century.Constant development of the expressway and constant perfection of vehicle management system offered the opportunity for the traffic administrative system based on image processing.In this paper,the recognition of license plates is studied according to the vehicle pictures acquisited in the system.The process is divided into four steps:region acquisition of license plate,image binaryzation,character segmentation of license plate and character recognition of license plate.Among them,the first three steps are the section of image preprocessing,which acquisits the vector quantity of the characteristic for the license plates,the last step is the key section,which adopts BP neural network and training of mass data to adjust the weight number of the network to reach the ideal discernment result.

Equipment Support Knowledge Ontology Construction Based on Protégé

Abstract: Equipment support knowledge system is complex and difficult to share and reuse,after analyzing the demands and functions of the equipment support knowledge ontology.A construction method that orients to the lifecycle knowledge ontology is introduced and it is suitable for the equipment support system.Following this method,rear ordnance depot knowledges are sorted and a tested knowledge ontology using Protege is constructed.

Research on Incremental PID Algorithm and Simulation Based on Neural Network

Abstract: To resolve the shortages of traditional PID controller which is not strong enough to control the time-varying system,an incremental PID controller based on neural network is designed to realize the online self-tuning of PID parameters in combination with the neural network theory and traditional PID control theoryThe result of experiment simulation shows that the controller has better adaptability than the traditional PID controller and can obtain the satisfactory control effect

Implementation of RFID Wireless Communication System Based on FPGA

Abstract: Wireless transceiver module is the key of RFID wireless communication system.The RFID wireless communication system based on FPGA is implemented.This system uses NRF905 module as RFID wireless transceiver module and uses xc2v1000 as the FPGA control module.The SPI bus mode communication between NRF905 and xc2v1000 was completed by wishbone-based SPI control module.The parametric design passed the pre-simulation and post-layout simulation,and realized 100 meters system communication distance in board-level verification.

Frequent Pattern Mining in Web Log Data

Abstract: Frequent pattern mining is an important research field in data mining with wide application,one of the fields is the data mining based on Web log data.The aim of discovering frequent patterns in Web log data is to obtain information about the navigational behavior of the users,the information can provide references for advertising purpose and creating dynamic user profiles.Three pattern mining approaches are investigated from the Web data mining,the different patterns in Web log mining are page set,page sequence and page graphs mining.

Performance Analysis of Full Mapping Chaotic Sequence about Logistic

Abstract: To produce Logistic full mapping chaos analog sequence,a Logistic full mapping chaos model is built,and then it is guantified two level digital sequence.The performance analysis of this chaotic sequence is carried out by use of Matlab 7.0 simulation.Senstivity of initial value,correlation,balance,ergodic,phase dimensional and double-periods forks characteristic are mainly analyzed.The analysis results show that the performance of this chaotic sequence is better than that of traditional pseudo random sequences for more well correlative performance and balance performance,and their number is large.It can be widely used in digital encryption and spread spectrum communcation.

Fabric Defect Detection Algorithm Based on Blob Algorithm

Abstract: For the high efficiency and accuracy requirement of fabric defect detection algorithm,the BLOB-based analysis algorithm is used to recognize defect of the captured fabric images.Some effective eigenvalue of relative defects can be gained through the simulation experiments of denoising the defect region,opening and closing operation,marking the target area and using the binary simulation.Experiments prove that the Blob algorithm is real-time and accurate in the defect detection.

Application of Self-adaptive Fuzzy PID in Temperature Control System

Abstract: As temperature system has the characteristics of non-linearity,large inertia and time variability,normal PID and normal fuzzy control can not meet the requirement of precise molding system.A self-adaptive fuzzy control in large area and PID precision output in small area,which adjusts PID parameters based on deviation and the deviation change.The structure and principle of self-adaptive fuzzy PID controller are analysed,and Matlab/ Simulink and fuzzy logic toolbox are simulated,the results of simulation show that the self-adaptive fuzzy controller posses the flexible and adaptability advantages of fuzzy control and the precise character of PID control.It improves the control effect on temperature system.

Design of Lifelong Education Platform Based on Cloud-computation

Abstract: A "cloud study" system that can realize the elasticity expansion according to the users′ requirements is designed to meet the request of the lifelong education.The study objects of users are integrable wares of knowledge pieces.All the user demands are regarded as a service requirement for cloud calculation.This "cloud study" is a study mode based on "cloud calculation".As for "cloud study",the centralization of management and allocation is realized by utilizing the "cloud computation" technology through the "cloud computation" platform.The lifelong education service platform is constructed based on "cloud calculation".The simulation experiment indicates that the lifelong education service platform based on the "cloud calculation" can offer the online study way of the customized lifelong education service for students.

Design of Intelligent System for Humidity and Temperature Acquisition Based on CAN Bus Technology

Abstract: An intelligent online acquisition system for humidity and temperature is designedThe system is mainly constituted by two modules:field data acquisition module and USB-CAN converter interface moduleField data collection is based on single chip AT89S52 as the core control unit,AD590 temperature sensor and humidity sensor HM1500 as auxiliary devicesThe data is sent CAN bus by the controller SJA1000USB-CAN converter interface module is based on ATmega 162 chip as the control unit,FT245BM USB communications chip and SJA1000 controllers as auxiliary devicesThen,USB-CAN interface conversion has been achievedThe terminal device of the entire system is the monitoring PCClient software is written by VC++ language,and it can achieve the monitoring for status in field,alarming for the site of upper or lower limits,management of the receiving data for disruption and so on

Development of Intelligent Inspection Vehicle on Granary Environment Detection

Abstract: Intelligent vehicle is an important branch of mobile robot researchThe intelligent vehicle can avoid obstacle with going along the anticipated way and collect important information about the environmentAn intelligent vehicle applying for granary monitor is designed and realizedThe designed vehicle can monitor the granary environment and collect the important parameters all day,such as temperature and humidityThe vehicle compensates for the lack of traditional granary monitor methods

Research on Technique of Image Edge Detection

Abstract: Edge detection is a very important part in image processing,which impacts on image analysis to the back.The Roberts operator,Prewitt operator,Sobel operator,LOG operator and Canny operator are introduced the performance and characteristics are analysed.Using Matlab for algorithm simulation,and test results are analyzed and compared.Canny edge operator has best level of edge linking,clear details and very comprehensive outline of the edge extraction.

Design and Application of Urban Intelligent Traffic Control System

Abstract: The intelligent transportation system is the forefront of the current research subject in the transportation field.Aiming at the increasing traffic demand and the lack of the transportation resources,the information technology,communications technology and computer technology are adopted in the research.Proceeding from the classification of the urban transportation system,the feasibility of the intelligent transportation system based on the urban intelligent traffic control system is analyzed,the design scheme of the urban traffic control system is proposed,and the control theory of the intelligent transport system is offered.The intelligent processing of traffic information,and the application and performance improvement of the system are discussed.

Design of ECG Simulation Waveform Generating System

Abstract: In the system which uses 32 bit low-power ARM9 microprocessor as its core,an embedded Linux operating system is transplanted to form the ECG waveform generation system to realize the real-time ECG acquisition and waveform display.Since Qt is a GUI support library used by KDE and other projects,many X Window programs based on Qt can also be easily ported to Qt/Embedded version.Therefore,the system uses Qt to develop the software interface.The system design includes ARM9 processor,the signal acquisition module,D/A conversion module,right leg drive,low-pass filtering module.The system taking an embedded Linux operating system as a software development platform,make full use of high-perfor-mance ARM9 and low-power performance,and can perfectly simulate the normal human defibrillation process and 34 kinds of common abnormal ECG waveform.Its output waveform has met the relevant requirements of medicine.

New Adaptive Deringing Algorithm

Abstract: Ringing effects seriously influenced the quality of restored image.A new adaptive deringing algorithm is proposed based on the deringing algorithm of MEPG-4.In the algorithm,edge parts are found firstly,then the median filter is applied to the image adaptively according to the cause of ringing effect.The results show that the proposed algorithm can reduce the ringing more effectively and can improve the subjective and objective quality of image compared to the existed algorithm.