bluuebunny/crossref_metadata_2025 huggingface dataset:
A Study of Wireless Monitoring early Warning Technology of Goaf Temperature Field
Authors: Jin Yong Fei , Deng Jun , Wang Wei Feng , Chen Xiao Kun
Published: November 2012

With regard to goafs where spontaneous combustion of coal is very likely to occur, wireless monitoring and early warning techniques in temperature field of goaf are raised. Wireless monitoring and early warning system in temperature field of goaf based on wireless sensor network is researched and developed. Comprehensive detection, identification and early warning in temperature field of goaf are realized. Key parameters of node deployment of wireless temperature sensor in goaf are figured out and the layout schemes are optimized. According to monitored temperature information, severity of coal spontaneous combustion in goaf is figured out; therefore, early warning methods at the position of fire source are determined. Results of industrial tests on site show that monitoring data acquisition, communication are of good timeliness and reliability, operation of the entire system is stable and key functions and technical specifications can meet the need of early identification and warning of coal spontaneous combustion.
Design of the Sound Insulation Chamber for Stored Grain Insect Sound Detection
Authors: Geng Sen Lin , Li Fang Ju
Published: November 2012

A six cubic meter sound insulation chamber is designed based on the principle of double-layer wall sound insulating and porous absorption with the characteristics of stored grain insect action sound. With 3 mm thick plywood as wall material, double - layer spacing 0.08 m, the outer wall being bored, each aperture 1mm, average spacing 1.5 cm, and the hard sound-absorbing material being filled in the two layers, a quasi - double layer perforated structure is built. The ambient noise is uniformly insulated between 125Hz and 2000Hz, and the average sound insulation is about 22dB, and it meets requirements of stored grain insect action sound for the spectrum and SPL. The result shows that the sound insulation chamber has the advantages of small size, economy, and good sound insulation effects.
Control System Construction of Orchard Transport Test Platform Based on PLC
Authors: Li Shan Jun , Meng Liang , Meng Qing Jian , Xing Jun Jun , Zhang Yan Lin
Published: November 2012

In order to solve the problems about testing and analysis for the optimization problem of the mountain orchards transport aircraft operating parameters and structural parameters, we build a transport aircraft control test platform. According to actual needs, for complete the circuit design,select the appropriate frequency conversion motor, frequency converter, PLC, and other critical hardware.Using fuzzy PI controller, in the Step-7 authoring environment to compile, complete the PLC programming design; Complete interface design in the in Eviews editing software EV500.After constantly adjust, in conditions for a variety of conditions like stoping in an emergency, an emergency starter, speed transient change, instantaneous change of goods bias, cargo rolling random, the system can be stable operation, uniform speed, experimental platform vibration is very small, the vibration of the truck itself is also very small,which can meet the test requirements enoughly.
Application of Microwave Technology in the Surface’s Water Pollution Monitoring System
Authors: Yao Yi , Yao Ya Chuan , Han Qiang
Published: November 2012

It introduces the application of electromagnetic wave propagation principle and microwave technology in the earth's surface water monitoring. On the basis of the operating principle of real-time microwave monitoring system, we have got the corresponding absorption curve through the contrast experiments on pollutants. Research the structure of microwave real-time monitoring system in the frequency of 200-2000MHz , discuss the concrete design and realization .
Feedback Error Learning for FES Control
Authors: Yuan Bao Ping , Yu Wen Wei , Gonzalez Jose , Gomez David
Published: November 2012

Walking assist using Functional Electrical Stimulation (FES) has been studied for a quite long time to help paraplegic persons overcome their walking impairment. One of the problems of these devices is how to cope with individual dependent, time-varying, and nonlinear user characteristics and external disturbances. In this study, Feedback Error Learning (FEL), a scheme that integrates feedback and feed-forward control, was applied to FES control. In this study, a FES experiment to human subjects was done to investigate the applicability of this system. The data obtained from the FES experiments were used to construct a new simulation model for further investigating the effect of FES in different condition. The results showed the usability of the FEL scheme for different FES control strategies.
Granary Wireless Temperature Monitoring and Alarm System Based on DS18B20
Authors: Wang Xue Mei , Li Guo Ping
Published: November 2012

This paper introduces a Radio Frequency module based on the nRF905 all-digital granary wireless temperature monitoring system. The whole system adopts DS18B20 to measure the granary temperature, measurement data is processed by microprocessor MSP430 next, then carried out by the RF module nRF905 remote transmission, and displayed the measurement data through JHD1602. In addition to showing the temperature of the granary and alarming, the system can set up or modify the working parameters through keyword at control terminals. This system is characteristic of multi-point measurement, high-precision, wide rang of temperature monitoring, stability good and alarming timely, it may also apply in other related temperature control system, the versatility is very strong.
Research on Duration Prediction of the Coupled Task Set Based on the Grey System Theory
Authors: Jia Peng , Gao Qi , Xu Rong Zhen , Zheng Xiao Chen , Liu Gang
Published: November 2012

In order to solve the problem of duration predicting in the project with poor information, small sample and uncertainty, a method based on grey system theory is put forward to predicting the duration of the coupled task set. A grey duration prediction model GM(1,1) is built, and the accuracy of the model is tested through residual, degree of incidence and posterior variance. Finally, the feasibility of the prediction model is verified by a practical application case.
Research of Elastic Deformation of Rubber Ink Roller and Ink Flow Characteristics on Two Ink Rollers
Authors: Su Lei , Chu Hong Yan , Cai Li Gang , Zhao Jun Tao
Published: November 2012

In order to improve the quality of colorful offset printing and know the process of ink transferring, this paper adopts the method of theoretical analysis and experiment, the velocity and pressure of the ink flow field are analyzed when the rubber roller deforms and the two rollers rotate, and the effective ink layer thickness is extracted, then the ink transferring rate can be got. The rubber roller’s deformation and ink transferring rate under different conditions are got, and factors, such as rotation velocity, deformation of rubber roller, ink layer thickness between two rollers, which affect the ink flow and transferring rate are analyzed.
Simulation Research on Test Platform of Wave Energy Hydraulic Conversion System in Laboratory Based on AMEsim
Authors: Wang Shou Jun , Liu Qi Qiang
Published: November 2012

The test platform of wave energy hydraulic conversion system is built up in the laboratory, which used to analyze the factors affecting the efficiency of wave power generation under the premise of simulating actual working conditions at sea with the maximum extent possible. This paper described the basic components and established the AMEsim model of the test platform, while we simulated the test platform based on AMEsim and researched the dynamic characteristics of the test platform and analyzed the energy loss of the system.
Experiment of Finger Deformation by Pneumatic Nozzle
Authors: Sun Zhong Sheng , Kou Liang Peng , Qiu Yue Tong , Li Xiao Ning
Published: November 2012

In order to study the relation between tactile sense and finger pad deformation during a tactile exploration task, a non-contact technique to measure the finger pad deformation was proposed in this paper. The finger pad deformation can be measured with high temporal and spatial resolution via laser displacement sensor installed on an XY movement workbench. The experimental results of the finger pad deformation in different conditions show that the characteristic of finger skin is viscoelastic. The parameters of viscoelastic model can be calculated by fitting method using the Kelvin model. They are helpful for modeling the mechanoreceptor responses in skin to improve the understanding of the mechanical behavior of the finger pad and of the relation between mechanical stimuli and tactile perception.
Structure Design and Turbulence Simulation of Disaggregation Pipe in Dry Powder Inhaler
Authors: Zhang Xian Kui , Liu Tian Yi
Published: November 2012

This paper provides structure design of the disaggregation pipe in active dry powder inhaler, to achieve the maximization of active pharmaceutical ingredient diffusing and disaggregating from its carriers, uses computational fluid dynamics method in CFX to simulate the turbulence in the structure, observes airflow velocity, turbulent kinetic energy and shear strain rate to evaluate the effect of diffusion and disaggregation and operate Lagrange particle tracking method in the structure to obtain particles’ superficial velocity, volume fraction and shear stress, providing a theoretical basis for structure design of the disaggregation pipe in active dry powder inhaler.
The Mechanism Analysis and Trajectory Simulation of 5R Joint Manipulator
Authors: Tao Ke , Zhang Yuan Yuan , Wang Zhi Jun , Song Ping Ping
Published: November 2012

5R joint manipulator kinematics model of position module is established, and according to the D-H method kinematical analyse of manipulator is processed, the space pose transformation matrix between adjacent rods of manipulator is established. The position equations of the manipulator is obtained and the Forward & Inverse solution of kinematics are got. The correctness of the forward & inverse solution are also verified through a engineering examples.
Application of Gain Scheduled PID Control in the Lithography Positioning System
Authors: Dong Gui Rong
Published: November 2012

According to the perturbation in lithography positioning control system, a novel gain scheduled PID controller using a root mean square (RMS) signal is proposed. Perturbation is also referred as the stage hunting, and the positioning control system will be very weak against small disturbances such as electrical noise or even structural vibration of the building in which the stage is installed. The gain scheduled PID controller is used to minimize the stage hunting and simultaneously maximize the immunity to disturbances. Simulations results verify the effectiveness of the gain scheduled PID controller for the positioning control in the lithography stage, as compared with the traditional PID controller.
Analysis of Position for the 4-PUU Parallel Manipulator
Authors: Sun Shu Hua
Published: November 2012

An original 4-PUU parallelManipulator with three-dimensional translations and one rotational motion about Z axis was presented. Its positional inverse modals were set up by using the conversion of coordinates and projection in analytic geometry, and the method of the forward solution of theManipulator and corresponding numerical examples were given.This methods were verified by using MATLAB software,which can provide the basis for studying the parallel robots work space. And it has wide application in the fields of industrial robots, micromanipulators, virtual axis machine tools, damping platform, rehabilitation robot and other fields.
A Study on Structure Design of Cable-Driven Picking Manipulator
Authors: Luo Hu , Tang Yong Gang , Shen Jun
Published: November 2012

Fruit picking is a seasonal and labor-intensive work. The industry requires automatic fruit picking due to increasing labor costs and variability in picking skill. High accuracy, simple structure and low cost are expected to make the robot be readily accepted and widely used. Cable-driven transmission is more preferable than traditional system for some of its merits benefiting the production of small and light-weight manipulator. In this paper, the design of a differential cable-driven manipulator is presented. Different way of cable-driven transmission are analyzed and compared. The selection of cable material and the way of cable fixation and preload are studied. The mechanical structure of the manipulator’s arm driven by a differential drive capstan is designed.
Research on Finite-Time Control Method for the Flexible Manipulator
Authors: Wang Yi Qing , Chen Qing Wei , Hou Bao Lin
Published: November 2012

Aimed at the finite-time stabilization problem of a class of flexible manipulators, a finite-time state feedback stabilization controller was proposed in this paper. Firstly, the nonlinear model of flexible manipulators was transformed into linear system through the exact state feedback linearization. Based on the the finite time stabilization control method of the linear system, a finite-time state feedback stabilization controller was designed for the flexible manipulators. Furthermore, it was proved that all the states of flexible manipulators could be stabilized to equilibrium in finite time with the proposed controller. The simulation results showed that the performance of the flexible manipulators with the proposed finite-time state feedback controller was effective. At last, the analysis and comparison of the proposed controller and the dead-beat controller were given.
Study on Discrete Particle Swarm Optimization Algorithm
Authors: Wang Bei Zhan , Deng Xiang , Ye Wei Chuan , Wei Hai Fang
Published: November 2012

The particle swarm optimization (PSO) algorithm is a new type global searching method, which mostly focus on the continuous variables and little on discrete variables. The discrete forms and discretized methods have received more attention in recent years. This paper introduces the basic principles and mechanisms of PSO algorithm firstly, then points out the process of PSO algorithm and depict the operation rules of discrete PSO algorithm. Various improvements and applications of discrete PSO algorithms are reviewed. The mechanisms and characteristics of two different discretized strategies are presented. Some development trends and future research directions about discrete PSO are proposed.
Human Body and Intelligent Bionic Architecture Design in Electronic Age
Authors: Wei Ze Song , Sun Shi Cun
Published: November 2012

Nature and life itself is a huge complex system which provides a broad unknown territory for human. People will call 2l century the era of life science. As a kind of cultural form, architecture must react to the corresponding demand. Nowadays, human expresses the soft change and alleviates negative influence of human technology form for nature and living environment by contemporary high-tech electronic technology and body bionic technology means. As a result, it will show the new compatibility, a revolutionary convergence between technology and biology.
Research on Control Strategy about Synchronous Process for Automatic Mechanical Transmission
Authors: Ling Ling , Li Jun Hao , Li Jiao
Published: November 2012

The working principle of lock ring synchronizer was expounded and the synchronous working process of automatic mechanical transmission (AMT) at each stage was analyzed in this paper. Based on the control principle of discrete PID, the corresponding control strategy to three stages was proposed. Then, the degree of jerk when starting of motor vehicle was used as an evaluation criterion. Finally, the bench tests were carried out to verify the feasibility of the proposed control strategy. The experimental results indicate that the control strategy can ensure the demand of jerk, meet the limited synchronous time, improve the smoothness and comfort of gear shift, reduce the wear of the synchronizing ring and increase the lifetime of synchronizer.
Nonlinear Compensation Method for Transducer Based on Neural Network with Fourier Functions
Authors: Wang Nan Lan , Cai Ming Shan
Published: November 2012

Aiming to solve the problems in the non-linearity of thermistor temperature transducer, a compensate model based on neural network (NN) is proposed. The basic idea is using Fourier series as the basic functions of NN，the output of transducer as input samples of NN and the temperature as the expectation output of NN. The output of NN is used to approximate to the measured temperature by adjusting the weights. The results show the proposed method is effective in raising accuracy.
Design on a Kind of Tension Test Sensor of Saw Wire
Authors: Zhang Bo , Wang Li Quan , Zhang Yi Zhi , Liu Feng Kun , Li Yan Jie
Published: November 2012

Using diamond saw wire can incise the seabed oil compound pipes, and its state being incised can be monitored by measuring the tension of diamond saw wire, so, it makes the cutting and advancing velocities under the condition of harmony. At first the tension of saw wire was analyzed at its working condition, the mechanism of the tension sensor was designed by the method of composition of forces, and put forward the measuring method about tension of saw wire based on up-down single chip communications. Next, the tension sensor was designed and its detection principle was introduced. Its calibration and accuracy were carried out. In the end, the test of examining tension underwater was done and validated its feasibility and reliability. it shows that the value of tension changes between 40N and 60N basically when the cutting velocity is in harmony with the advancing velocity.
Localization Technology Based on Quantum-Behaved Particle Swarm Optimization Algorithm for Wireless Sensor Network
Authors: Zhao Ji , Fu Yi , Wang Han Bo
Published: November 2012

This paper proposed a distributed iterative localization technology of wireless sensor networks (WSNs) to solve the problem of node localization. In this approch, once the nodes get localized, they act as references for the rest of nodes to localize. The ranging-based localization problem is formulated as a multidimensional optimization issue, and the quantum-behaved particle swarm optimization algorithm (QPSO) is used to exploit their quick convergence to quality solutions. Finally, the simulation results compared with the particle swarm optimization algorithm (PSO) algorithm show that QPSO outperforms the PSO and improve the node position accuracy, which prove the validity of the presented method.
The Construction and Performance Evaluation of Internal Control under Network Accounting Information System
Authors: Wu Pu Feng , Yuan Jin Ting , Ren Hong Rui
Published: November 2012

Based on the traditional internal control system theory and risk analysis of network accounting internal control, a new network accounting security internal control system is proposed and described in detail in this paper. Then we use the fuzzy evaluation method to evaluate the performance of the system, judge the control effect of network computer accounting from the quantitative aspect, and verify the system.
Self-Correcting Time Synchronization Based on Cross Layer for Wireless Sensor Network
Authors: Liang Feng Mei , Liu Bin
Published: November 2012

Due to energy restrictions, node distribution density and hardware computing power etc., the traditional time synchronization mechanism is not suitable for wireless sensor network. The paper discussed the main reason that caused asynchronization and proposed an improved time synchronization algorithm based on cross layer optimization for wireless sensor network. Considering the stability of crystal oscillation and the linearity of crystal deviation in the physical layer, the improved time synchronization mechanism implemented a self-correction by the cross-layer MAC protocol. Estimating the crystal oscillation drift, the crystal deviation had been self-corrected just by a few times data broadcast. The experiment on the MCU Si1000 physical layer platform has demonstrated the practicability of the algorithm. The synchronization algorithm is able to keep a stable network operation in the way of extending the synchronization period and reducing the synchronization cost. The synchronization mechanism is applicable to the active acquisition network, especially the realtime one.
A New Electromagnetic Field Probe by Using Printed Dipole Antenna
Authors: Liu Xiao Lan , Lin Jin Cai , Hu Jin Hang
Published: November 2012

This paper presents a novel Electromagnetic field (E-Field) probe structure employing a printed dipole antenna to get isotropic pattern. The printed dipole is constituted by a variety of orthogonal dipole antenna array, and it is used in the design to reduce the complexity and cost. In this paper, we stimulate the printed dipole antenna and detector diodes by software, and the results confirm the validity of the printed dipole antenna. Moreover, the directivity of antenna array depends on the location of dipole antenna. By changing some design of the antenna, the probe achieves flat frequency response in 0.1GHz-10GHz.
Localization from Connectivity in Wireless Sensor Networks Based on Distributed Weight-Multidimensional Scaling
Authors: Li Zhong Sheng , Shan Zhi Long
Published: November 2012

A localization algorithm from connectivity based on distributed weighted-multidimensional scaling (cdwMDS) algorithm is proposed in this paper. Each sensor selects a neighbor sensor adaptively, calculates the iteration step size with the average connectivity and updates the estimate location by optimizing the local cost function. Connectivity is used to determine the step size of gradient iterative optimization in this algorithm. After getting the estimated positions, a relative map is built and the absolute coordinates can be obtained. Simulation results show that this method could achieve higher localization accuracy and more stable convergence.
Numerical Simulation and Optimum Design of a Double-Cone Flow Sensor
Authors: Xu Ying , An Jun Da , Long Zheng Hai , Zhao Yi
Published: November 2012

This research based on a new type of Double-cone flow sensor, using computational fluid dynamics (CFD) method and orthogonal experiment to investigate the influence of key geometric factors, such as fore-and-aft cone angle, equivalent diameter ratio and channel flow length, on discharge coefficient, discharge coefficient linearity and relative pressure loss of double-cone flow sensor, and finally predict the best optimal match of these geometric factors. The turbulence model is RNG and the medium for simulation is water. After the simulation, a special device for calibration was set up to verify the computational conclusion. The results show that the biggest deviation of simulation on discharge coefficient linearity and relative pressure loss are less than 0.4% and 1.2%, the results simulated by CFD are in good agreement with that by experiment.
Study on Leak Detecting System for Oil Pipeline Based on Multi-Sensor Data Fusion Technique
Authors: Zhang Jie , Wang Xiao , Zhao Zhen
Published: November 2012

In this paper, based on the wavelet transform method, the multi-sensor data fusion technology is adopted to solve some key problems in pipeline leak detection system. Compared with the traditional filtering method, the wavelet transform method can better remove the pipeline leakage signal noise. When the corresponding wavelet is selected, after FPGA realized, the method has the advantages of fast speed, arbitrarily data width set, which can better meet the needs of real-time signal processing requirements of pipeline leak. At the same time, VHDL language has the characteristics of portability, greater generality. When multi-sensor fusion technology is used in the paper, the relation, correlation, estimation and integrated processing is done in turn to the information from multiple data sources, the system can achieve better detection performance than a system using the single sensor, so as to form a more complete, reliable pipeline real time detecting conclusion.
Temperature Drift Modeling and Compensating of Fiber Optic Gyroscope
Authors: Xiao Tao , Pan Ming Hua , Zhu Guo Li
Published: November 2012

The main factors affecting the temperature drift of the fiber optic gyroscope was analyzed in this paper. The autoregressive model of temperature drift related to the temperature and the rate of temperature change was built. The coefficients of the model can be obtained by least squares fitting. Experiments show that the model was effective. With the drift model the drift trend caused by temperature can be estimated. The temperature drift can be compensated using the drift trend. The experiment result shows that the drift error can be decreased about 87% after compensation.
A New Type of Nonlinear Viscous Damper
Authors: Li Jin Hai , Zhang Song Lin
Published: November 2012

In order to satisfy the needs in engineering practice，a new type of nonlinear viscous damper with conical valves is developed. There is a through hole and two valves in the piston of the damper. When the damper work, the fluid flows throw the hole and the regulators, then the energy is consumed. The regulators open because of the pressure difference and adjust their sizes to control the damping force to get just the effect we wanted.
Design on the Amplifier Circuit of Metal-Oxide Semiconductor Gas-Sensitive Sensor
Authors: Liang Xi Feng , Liu Li Hao
Published: November 2012

Metal-oxide semiconductor gas-sensitive sensors have various advantages as the basic devices of gas detection systems, such as high sensitivity, fast responsibility and low cost, etc. They are widely applied to many fields. Amplifier circuit is an important section of gas detection system. A new type of amplifier circuit including a three-stage operational amplifier was designed in the paper which can effectively eliminate the influence of the follow-up circuit on the sensor output. Theory analysis and experimental simulations were performed. The results show that the output voltage signals have a linear relation with the concentrations of the detected gas.
Correlation Coefficient Calculation and Simulation in Antenna Diversity
Authors: Kan Ling Ling , Liang Hong Wei , Gao Bing Kun , Wang Xiu Fang , Li Hong
Published: November 2012

Smart antenna is the critical technique of the third mobile communication, and will become the key technology in the fourth generation communication. The benefits of pattern diversity increase as the incoming pattern distribution becomes more isotropic, so that the research on correlation coefficient in antenna diversity is very critical. This research reviews the related definitions of antenna diversity as well as the related parameters, and then introduces our algorithm to develop closed form solution to calculate correlation coefficient, which provides a generalized method of determining the efficacy of an antenna diversity system. The correlation coefficient calculation is simulated with MATLAB. The simulation results show that the method is efficient and flexible, which will serve as a design tool when constructing pattern diversity systems.
Battery Quick Change System Equipment of Passenger Cars and its Application Mode Research
Authors: Zhao Guan Hao , Yang Qin , Yan Ai Zheng , Zhao Hui Liang , Peng Min , Luo Sheng Zhao
Published: November 2012

According to the current situation of domestic passenger cars’ battery quick change equipment and its overall development trend, we first research on the key module technology of passenger cars’ battery quick change system. Then, this paper researches on network information control mode, internal dynamic management mode of the battery quick change system, radio frequency identification (RFID) and storage charging system mode, respectively. Thus, they can provide passenger cars’ battery quick change system with some references realizing the system’s network, intelligence and high efficiency.
The Principle Analysis and Research of Power System Converter of Microwave Power Module
Authors: Zhang Guo Dong , Zhou Dong Fang , Yan Deng Gao , Li Jian Bing
Published: November 2012

According to the demands of power supply system of microwave power module (MPM), ZVS push-pull dual-voltage resonant converter is present. High-voltage can be achieved in this new novel converter topology. The paper introduces the structure of the converter. Then the steady-state and operation characteristic of the converter is analyzed and deduced. A Pspice simulation is carried out to verify the theoretical analysis, the results and conclusions are given in the end. The results show that the ZVS push-pull dual-voltage resonant converter can realize the soft-switch and double voltage well. The structure of the converter is simple and easy to implementation, so it suitable for low input voltage and high output voltage power supply system.
ARM-Based Embedded Visual Processing System
Authors: He Guo Hao
Published: November 2012

Embedded computer vision is a relatively new concept, it is only in the past few years that embedded devices have become fast enough and the component cost low enough that they can be used in small low power systems. In this paper, the design and development of a vision-based detection system with smart devices features is proposed. The main functionality of the equipment is introduced as well as the additional features it should provide to be integrated into a smart environment.
The Implementation of Pipe Climbing Robot’s Real-Time Speech Control Based on the Generalized Regression Neural Network in Embedded System
Authors: Fan Bing Hui , Ji Peng , Zhou Kai
Published: November 2012

This paper describes a speech pre-processing and feature extraction methods and described the principle of generalized regression neural network (GRNN). In order to use neural networks for speech recognition, this article uses the variable frame-shift average frame method to average the characteristic parameters of the collected voice frame, and the feasibility of the variable frame-shift average frame method in neural network input parameters normalization is verified by experiments. In this paper, according to this method, the speech recognition based on the generalized regression neural network (GRNN) successfully ported to an embedded system, and realized the pipe climbing robot’s real-time speech control.
Design of the Function Units of Electronic Password Lock
Authors: Zhao Yan Ru , Wang Dong Sheng , Li Jiu Dong
Published: November 2012

The hardware modules of electronic password lock were designed in the paper. The single chip microcomputer AT89S51 was chose as the main control chip to control the operation of the whole system. The 4×4 matrix keyboard was devised and the unlocking circuit was made up of the driving circuit and unlocking part. The alarm circuit was composed of a piezoelectric buzzer and its peripheral circuit. The serial electrically erasable memory chip AT24C02 of ATMEL firm was chose as the memory cell for losing electricity. The power supply circuit including of the commercial power supply circuit, power failure detecting and electronic switching circuit and the battery charging circuit was designed. The module functions of the whole system were combined and the hardware circuits of the electronic password lock were designed successfully.
Layered Space-Time Multi-User Detection Based on Kalman Filter
Authors: Yang Ling Ling , Shao Hong Xiang , Hu Yong Sheng , Guo Chao
Published: November 2012

This paper represents the theories of mathematical model of DS-CDMA system, principle of Kalman filter and layered space-time coding. Then, for the purpose of overcoming the disadvantages of traditional multi-user detection algorithm, the paper proposes the layered space-time multi-user detection algorithm based on kalman filter. Simulation results show the effectiveness of the proposed algorithm, such as the convergence speed is quickened, bit error rate is reduced greatly and channel tracking capability is improved significantly.
Design and Application of Wireless Mesh Network Based on ZigBee Pro
Authors: Li Rui Li , Liu Shu Gui , Zhang Rui
Published: November 2012

The ZigBee wireless sensor network has been already widely used in many areas of industrial control, home network and medical equipment. A wireless mesh data transmission network based on the chip CC2530 of TI and the ZigBee Protocol stack was established with the practical application, in which any two nodes can communicate directly. The experimental results show that the designed network has special features of the high speed of data transmission, low delay, fault tolerance and flexibility. Finally, application in the wireless intelligent light pen CMM measurement system was analyzed.
The Research and Implementation of USB Communication Interface Circuit Based on FPGA
Authors: Wang Cai Hong , Jin Guang Feng
Published: November 2012

This paper puts forward the design of communication system based on FPGA. USB controller CY7C68013 is widely used for its faster data transmission rate and diverse interface way which provide a simple and seamless connecting interface for the ATA, FPGA and DSP . This paper introduces the basic working principles of the controllers, and uses its affiliate FIFO method in order to produce corresponding control signal in FPGA with VHDL. It realizes fast data transmission between PC and FPGA through USB. Test results shows that the scheme transmission speed fast, data accurate, and can be extended to other need through the USB fast data transmission system.
Large-Scale Analog Circuit Evolutionary Design Using a Real-Coded Scheme
Authors: Jiao Su Min , Wang Cai Hong , Wang Xue Mei
Published: November 2012

Analog circuits are of great importance in electronic system design. Recent evolutionary design results are usually small-scale analog circuits. This paper proposes a real-coded mechanism and uses it in the large-scale analog circuit evolutionary design. The proposed scheme evolves the circuit topology and size to a uniformed continuous space, in which the circuit representation is closed and of causality. Experimental results show that the proposed scheme can work successfully on many analog circuits with different kinds of characteristics. Comparing with other evolutionary methods before, the proposed scheme performs better on large-scale problems of circuit synthesis with higher search efficiency, lower computational complexity, and less computing time.
Based on Feed-Forward Photovoltaic Grid Converter Control Strategy
Authors: Yao Xing Jia , Zhu Jin Hua , Liu Ying Ming , Wang Xiao Dong , Xie Hong Fang
Published: November 2012

In photovoltaic grid-connected system, the method of adding voltage feed-forward to improve the shape of grid-connected current wave is presented, the reason for the introduction of the net voltage feed-forward decreasing the phasic difference between grid-connected current and net voltage and reducing the THD of grid-connected current is analyzed. It is confirmed that the net voltage feed-forward compensation can improve grid-connected current availably by the results of simulations and experiments, keep the current frequency and phase synchronous to the grid.
Imagine Techniques for Aligning in the Degenerate Four-Wave Mixing Experiment
Authors: Wang Wei Bo , Fan Rong Wei
Published: November 2012

Phase-match in degenerate four-wave mixing (DFWM) is not automatically achieved in the forward folded boxcars geometry. In this paper, we first design a simple image aligning system composed of an optical system, CCD camera and the related software. We can feasibly obtain well overlapped spot in the sample cell without moving the sample cell under this system. Also, we have proven the three pumping light beams are well overlapped in the sample cell when the three pumping light beams are on the same spot on CCD camera. This method minimizes the deviation by our eyes aligning. We can easily and timely know the effect of the pointing stability on the optical path by monitoring facula changing with the laser beam pointing and disturbs of the environment. So, this is a good choice for fast adjusting the light path and finding the overlapped spot. Finally, Steady DFWM signals have been obtained in the iodine vapor. This system makes it feasible that the potential application of FG-DFWM is used as a diagnostic tool in combustion research and environment monitoring.
Research on Test Technology of Intersection Laser Accuracy Optical Target
Authors: Chen Rui , Cai Rong Li
Published: November 2012

The projectile’s shooting accuracy measurement is an important content during the target measurment, based on the analysis of the various test principles of existing accuracy test equipment, i.e. accuracy optical target,a new-type test technology of accuracy optical target ,which is based on intersection laser principle, has been designed. In the design, the optical path is reasonable, and the circuit is simple without amplifier circuit but can realize digital signal processing and it has made experimental verification on the core technologies of the sensitivity and frequency response etc. in the signal acquisition circuit.
Review of Recent HV-LED Technology
Authors: Hong Jian Ming , Li Xiao Yun , Niu Ping Juan
Published: November 2012

LEDs for lighting application are becoming widely adopted due to economic, energy and environmental reasons. LEDs are conventionally powerd by low-voltage DC sources. More and more recent research works have been focusing on an integrated LED chip directly driven by high-voltage DC power supply (HV-LED). The chip structure, the key manufacturing processes and its driving technologies are discussed respectively in this paper, which indicates the advantages of HV-LED including higher luminous efficiency, lower cost and enhanced reliability, and base on this, a HV-LED flip chip is proposed.
An Analysis of Structure and Transforming Factors of Tacit Knowledge of Private Science and Technology Enterprise
Authors: Kong Ling Fu
Published: November 2012

Compared with explicit knowledge, tacit knowledge is much more perfect and can be used to create valuable things. The ability of exploiting and utilizing tacit knowledge has become the significant factor to success for an individual or an organization. Private Scientific and Technological Enterprise (PSTE), as one of the main parts of National Economy in China, desire to transfer the internal tacit knowledge into the productivity in the reality. In this paper, the nature of tacit knowledge will be analyzed. Besides that, the factors that restrict the share of tacit knowledge in PSTE will be analyzed in detailed from individual, group and organization these three aspects, all are based on the infrastructure of tacit knowledge.
Information Acquisition of Maintenance, Repair and Overhaul/Operations System for Helicopters
Authors: Zhang Chi , Xu Cheng Dong , Pei Xin , Hu Chun Sheng
Published: November 2012

The helicopter Maintenance, Repair and Overhaul/Operations (MRO) system enables the best sharing of the maintenance resources and maintenance ability in a wide area, so as to promote the specialization of the helicopter maintenance organizations. Information acquisition is an important and difficult part of the helicopter MRO system. This paper systematically analyzes the condition monitoring methods which are used to monitor the rotational speed, temperature, pressure, vibration and flight parameter in different parts of a helicopter, and then it puts forward some improved ways for information acquisition. Considering the helicopter’s features, the process of information acquisition is illustrated. In addition, this paper presents the basic requirements of data sampling, and it also shows a detailed discussion on data format and data transmission in the helicopter MRO system. At the end of the paper, a system mode and architecture of helicopter MRO system are proposed.
Research on the Effect of Polarization on Wireless Communication in a Rectangular Tunnel
Authors: Chen Peng , Li Xiao Ming , Wang Zhong Bao
Published: November 2012

In this paper, the wireless communication at 433 MHz with different polarization modes in a rectangular tunnel has been analyzed. Based on the theoretical analysis, it is found that if the height of the rectangular tunnel H is greater than the width W, the performance of the wireless communication by means of vertical polarization is better than that of horizontal polarization, but when H < W, horizontal polarization is better than vertical polarization. To prove this point, a measurement has been carried out in a rectangular tunnel. The height of the tunnel is 3 meters and the width is 2 meters. In the experiment, the transmitting power is from -30 dBm to -25 dBm, the receiving sensitivity is -105 dBm, the gain of the linear polarization antenna is 2dBi, and the transmitted data is uncoded. The experimental results show that communication distance of the vertical polarization is better than that of horizontal polarization in the tunnel.
Analysis on the Differences among the Characteristics of Imaging in Subdivision Bands of Mid-Wave Infrared
Authors: Lin Su Zhen , Yang Feng Bao , An Fu , Zhou Xiao
Published: November 2012

On the basis of analyzing the process of passive thermal imaging in subdivision mid-wave infrared thoroughly, the paper makes clear the factors which influence imaging in subdivision bands of mid-wave infrared(SBMWIR). The forming models for images in SBMWIR are set up，and some simulation experiments on these models are done, from which the formation mechanism of the characteristic differences of imaging in SBMWIR are shown. There exist three differences in SBMWIR imaging, relating to the gray scale, environment effects on the target, and the contrast of target-background, which provide the foundation for extracting characteristics from images in SBMWIR, formulating fusion rules, and determining fusion weights.
Optimal Approximate Solution of a Class of Matrix Equation
Authors: Cheng Chun Rui , Zhu Jun Hui
Published: November 2012

The optimal approximate solution of a class of matrix equation is considered. Based on the generalized singular value decomposition, the expression of the optimal approximate solution to a given matrix pair is derived in the symmetric solution set.
Time Scale Variation of the Yellow River Ice in the Inner Mongolia Section Using Wavelet Analysis
Authors: Deng Yu
Published: November 2012

Due to the comprehensive effects of thermal factor, power factor, river course factor and human factor, indicated that ice information, such as flow ice date, frozen river date, breakup date of river ice and ice thick and so on presents complex change, this article attempts to analyze ice information whether has varied characteristic in the time criterion with the wavelet method. Through analyzing wavelet transform coefficient and wavelet variance in Inner Mongolia section, and the time series rules are summarized of ice characteristic. At the same time, wavelet variational figures and wavelet transformation frequency variance figures are drawn of Inner Mongolia station. Research results show that flow ice date sequence have obvious frequency variance extreme value of about 12 years criterion, therefore said that flow ice date exists about 12 years cycle, frozen river date and breakup ice date sequence have not remarkable frequency variance extreme value, but there is no obvious peak in about 6 years place of frozen river date frequency variance and in about 12 years place of breakup ice date frequency variance, which explained that frozen river date and breakup ice date sequence exist weak cycle.
Synergetic Multi-Semantic Multi-Instance Learning for Scene Recognition
Authors: Feng Wen Gang , Chen Xue
Published: November 2012

In this paper, the problem of scene representation is modeled by simultaneously considering the stimulus-driven and instance-related factors in a probabilistic framework. In this framework, a stimulus-driven component simulates the low-level processes in human vision system using semantic constrain; while a instance-related component simulate the high-level processes to bias the competition of the input features. We interpret the synergetic multi-semantic multi-instance learning on five scene database of LabelMe benchmark, and validate scene classification on the fifteen scene database via the SVM inference with comparison to the state-of-arts methods.
Dual-Butterfly Parallel Access Constant Geometry Pipeline Radix-2 FNT Algorithm
Authors: Huang Dan , Yu Ji Yang , Meng Hong , Huang Xiao Ping , Feng Yuan , Li Guang Yun , Li Wen Wei
Published: November 2012

A dual-butterfly parallel access constant geometry pipeline radix-2 FNT (Fermat Number Transform) is proposed to enhance the computing performance of FNT. By the extending the conventional constant geometry FNT, two radix-2 butterflies could be calculated simultaneously in each stage, and the address generating method for parallel access without conflicts is deduced to make the dual-butterfly’s four operators fetched and stored at the same time. Compared with other single data stream FNT, the efficiency is enhanced by 3 times. Compared with the traditional convolution and the convolution based on conventional FNT, the convolution based on the proposed algorithm has the advantage in computing efficiency, which also indicates the efficiency of the proposed algorithm.
Image Registration Based on Mutual Information and Harris Corner Points
Authors: Cheng You E
Published: November 2012

A maximization of mutual information based image registration method is described. Firstly Due to the inferiority of image registration using maximum mutual information, the registration based on Harris algorithm to obtain corner points. Secondly, the one to one matching points could be obtained through mutual information rough match. Finally, the search strategy used the improved genetic algorithm to find the optimum value. Experimental results indicate the proposed algorithm can achieve better accuracy and good robust.
Object Annotation Based on Middle Semantic Manifold
Authors: Feng Wen Gang , Zhou Xipin
Published: November 2012

A novel bionic, middle semantic object annotation framework is presented in this paper. Moreover, we build the model based on the perception as defined by the human visual system. At first, the super-pixel is used to represent the images, and conditional random field could label each of the super-pixels, which means annotating the different classes of objects. In next step, on the basis of the previous result, image pyramid is used to represent the image, and get the sub-region of some objects of the same class. After extracting descriptor to represent the patches, all the patches are projected to a manifold, which could annotate the different views of objects from the same class. Experiments show that the bionic, middle semantic object annotation framework could obtain superior results with respect to accuracy.
Harmonic and Inter-Harmonic Detection Based on FFT and Nonlinear Optimization
Authors: Zhang Huai Qing , Liu Ran , Xiong Hao
Published: November 2012

In order to analyze harmonic and inter-harmonic parameters more accurately, a new detecting method that combined the nonlinear least squares and fast Fourier transform(FFT) was proposed. The FFT was used to produce a rough estimated value of harmonic parameters and then the signal model was set. Finally, the parameters can be estimated more accurately by the use of optimization algorithm which based on damped nonlinear-least squares method. The combined method solves the problem of inaccurate estimate by FFT and solves the problem of how to set the signal model and to choose initial value. The simulation results show that the combined method is effective and far more accuracy than interpolated Hanning window method.