bluuebunny/crossref_metadata_2025 huggingface dataset:
FPGA Implementation of NAND Flash Wear-Levelling Algorithm
Authors: Wen Ju Hong , Wang Wei Jiang , Gao Wei , Fan Xiao Nan
Published: December 2012

NAND flash would generate invalid blocks during its manufacturing and using, and the invalid block management is a key point of NAND flash. By studying the structure and storage rules of NAND flash, this paper put forward a wear-levelling algorithm against the invalid blocks of NAND flash based on FPGA. This algorithm use invalid block table and logical-physical address mapping table to manage the invalid blocks and do wear-levelling. The design is implemented by VHDL, and successfully realized the wear-levelling and the reading and writing operations of NAND flash.
Sensorless Control of PMSM with Compensated Sliding Mode Observer
Authors: Song Zi You , Li Jian Qiu , Ouyang Ming Gao , Xu Liang Fei , Hu Jun Ming
Published: December 2012

This paper presents a research on sensorless control of Permanent-magnet Synchronous Motor (PMSM) based on a compensated sliding mode observer (C-SMO) using one Hall sensor. Generally the sliding mode observer (SMO) has an attractive robustness to disturbances, and parameter variations in relatively high speed region. But the SMO cannot help reducing the ripple or chattering components of the estimated currents and the estimated phase especially in the low speed region. The estimated rotary speed is the differential result of the estimated phase. So the noise of the estimated phase is amplified in the estimated rotary speed which is used in speed closed-loop control and the low pass filter. The PMSM cannot be started with traditional SMO under closed-loop control condition. A more accurate estimated speed and a phase reference may solve this problem and they can be estimated by the Hall sensor. This more accurate estimated speed can also help the PMSM achieve a better performance on rotor phase estimation. The C-SMO which combines the advantages of Hall sensor and SMO achieves a less noise, less vibration effect. And the PMSM can be started with C-SMO under closed-loop control condition. The comparison between the SMO and C-SMO is realized by Matlab/Simulink and the simulation results show the effectiveness of the proposed algorithm for the sensorless drive system of a PMSM.
Application of Fuzzy PID Control in Sluice Control
Authors: Huang Feng Chen , Feng Hui , Ma Zhen Li , Yin Xin Hui , Wu Xue Wen
Published: December 2012

Fuzzy control, based on traditional Proportional-Integral-Derivative (PID) control, is used to improve the management of a hydro-junction’s sluice scheduling. In this study, we combined the PID and Fuzzy control theories and determined the PID parameters of the fuzzy self-tuning method of a hydro-junction’s sluice. A fuzzy self-tuning PID controller and its algorithm were designed. In hydro-junction sluice control, the Fuzzy PID controller can modify PID parameters in real-time, resulting in a more dynamic response. The application of the fuzzy self-tuning PID controller in the CiHuai River project information integration system yielded very good results.
Based on the State Feedback Optimal Controler Design
Authors: Zhang Wei
Published: December 2012

The study on linear quadratic optimal control based on state feedback has been achieved fruitful results. This paper design a linear quadratic optimal controler based on the state feedback, and used it in a real state equation. The control scheme proposed has advantage of simple cotroller structure,low cost and easy to implement. Through simulation and compare with the performance target ,the Simulation and experiment show that the designed controller is effective, to the system dynamic response has good tracking performance and anti-interference ability.
Computer Fluid Dynamics Analysis of Cryogenic Oil Mist and Structural Optimization of Spraying Nozzle
Authors: Zou Lin Tao , Zhang Song , Zhang Qing
Published: December 2012

An investigation of the cryogenic oil mist flow field of nozzle was carried out in this study. A domain of the nozzle jet area was modeled with Pro/ENGINEER. CFD (Computational Fluid Dynamics) analysis was used to state the velocity field of different distances from the outlet of nozzle. The simulating velocity field was verified with the experimental results. Experimental results on velocity were measured by SYT-2000 digital multipurpose wind speed gage. The orthogonal experiment was designed to investigate the main effects parameters on velocity and temperature. It indicates that higher flow of cold air and smaller diameter of nozzle’s outlet will generate higher velocity. The temperature of cold air has most influence on the temperature of measuring point. Finally the optimum structure of the spraying nozzle was proposed.
High Gain Observer for Drag Tracking in Mars Entry Longitudinal Guidance
Authors: Wu Kai , Cui Hu Tao , Ma Dong Mei , Cui Ping Yuan
Published: December 2012

An extended high gain state and perturbation observer combined with feedback linearization was applied in drag tracking for Mars entry longitudinal guidance. The observer estimates the drag, the drag rate and the perturbation due to model uncertainty and disturbance for drag tracking. Mars entry simulation was performed to assess the performance of the adaptive guidance law. The results demonstrate that the proposed guidance law is robust to model error, and can recover the ideal performance of the feedback linearization control.
Real-Time Control and Data Exchange Method in Software CNC System Based on PC
Authors: Wang Kun Qi , Yang Jing Wei , Lei Li Qun
Published: December 2012

A new real-time control method for software CNC based on PC is proposed, and the data exchange methods are given. Both external and system clock interrupt are adopted as interpolation cycle to make up software CNC on PC. The data between the front procedures, interpolation module, and background procedures, application module, is exchanged by WDM. The method is verified in experiment, and the resolves show that the speed control and the interpolation operator are right, and whole software CNC is significantly improved.
Research on Detecting Radio Amendatory Channel
Authors: Chen Dan Qiang , Cao Guo Hua , Fan Hui Lin , Bao Xue Liang , Wang Hao Peng
Published: December 2012

Radio amendatory channel is used in command guidance for missile, whose working state has direct influence on the precision of a missile. Therefore, it’s necessary to design a radio frequency detector for cycle detection of radio amendatory channel. After analyzing operating principle of the radio amendatory channel, the paper proposes a detecting program, introduces hardware and software design of radio frequency detector including high frequency receiving module, intermediate frequency receiving module and information processing module. The radio frequency detector has been applied in detecting airborne radio amendatory channel successfully improving support efficiency, and provides a reference for detecting other radio frequency.
Improved Analytic Guidance Algorithm for Mars Entry
Authors: Xu Hong Ying , Cui Hu Tao
Published: December 2012

With the development of Mars exploration, NASA has been preparing plans for a crewed mission to Mars in the next few decades. One challenge associated with crewed missions to the Mars is the high ballistic-coefficient and human-class payloads. Because of the high ballistic-coefficient, the maximum limit value of the reference flight path angle is always the reference flight path angle meeting the downrange and altitude for the constant flight path angle algorithm. So this paper presents an improved algorithm which the terminal velocity is controlled by dynamic pressure controller, and the controller is used to modulate the velocity and altitude to meet final constraints. Simulations results of a Mars entry scenario illustrate that the improved algorithm achieves the final constraints within allowable tolerances.
Reliability Analysis Based on the Deceleration Electric Wheel
Authors: Xie Fang Zheng , Zhang Bao Xia , Xiao Cheng , Song Xin
Published: December 2012

Reliability is an important index to indicate the quality of products. The definition, composition and working principle of deceleration electric wheel are described in this article. The reliability of the system is analyzed with stress analysis method, score estimation method and device counting method. It offers the theoretical support for such a system to be put into actual design and production.
Full Software CNC System for Line Contact Milling
Authors: Wang Kun Qi , Yang Jing Wei , Li Chuan Chang
Published: December 2012

A new method of CNC system for line contact milling is proposed based on full software. In the method the composite interpolation processing is put forward to process space ruled surface. Line contact method is studied to improve surface processing efficient. Full software CNC is designed to the processing. Based on the data of composite interpolation procedures in VC, space graphics can be generated in Matlab. The result shows that it is possible to process space complex curved surface.
Study on Open CNC Control System Based on GUC Motion Controller
Authors: Zhao Jian Wen , Xie Wei
Published: December 2012

This paper mainly focuses on designing an open CNC system. At first, the advantages and disadvantages of the three popular open numerical control technologies were discussed, and on the basis of demands analysis, this paper chose motion controller plus PC as the whole system model. Then, according to the system model, this article designed the hardware system for the control system, including choosing multi-axis motion control card, servo motors and their drivers. Thirdly, based on the features of this open numerical control system, the paper designed and put the software into three levels, namely low level of control software, mid-level of communication software, and high-level of management software respectively. Finally, in order to test the control performance of this open numerical control system, some experiments were carried out on a two-dimension motion platform, the results are satisfactory and error analysis on these experiments is also given out.
Optimal Weighted Least Square Data Fusion Method for Redundant IMU Based on Calculation of Measurement Error
Authors: Xing Chuan , Zhang Hai
Published: December 2012

A dodecahedron non-orthogonal redundant IMU configuration was selected as model. To improve fusion accuracy, we proposed an effective calculation method for measurement errors based on the correlation between measurement errors and fusion errors. The method considered the difference between traditional data fusion vector’s projection and measurement results, and then made a conversion from projection error to measurement error. Combined with optimal weighted least square method, measurement error was used to generate an optimal weighted matrix, and this made data fusion errors minimum. Simulations also proved that the fusion result of this method is more accurate than the result of traditional method.
Design of Integrated Control System for Microfluidic PCR Analysis Instrument
Authors: Xu Jian Dong , Lv Xue Fei , Liu Yun , Li Xiao Qiong , Deng Yu Lin
Published: December 2012

In this study, the design and development of an integrated control system for microfluidic PCR analysis instrument was presented. PID temperature control algorithm is used. The micro pumps, micro valves, and micro-mixers are command controlled by PC serial port to work together for samples and reagents driving. Sequential control strategy is introduced to control micro-pumps, micro valves, mixers, high-voltage module, and PCR reaction temperature. Labview as a software development platform is utilized to achieve human-computer exchange. All these designs are aimed to achieve the PCR reaction continuously on line from DNA extraction, purification, amplification to detection. An effective design idea for the coupling of complex microfluidic chip and instrument control was providing.
Research on the Hybrid Modelling Method Based on Mechanism and Identification for Marine Diesel
Authors: Kong Qing Fu , Zeng Fan Ming , Wu Jia Ming , Wu Jie Chang
Published: December 2012

Mechanism method and neural network identification method are widely used for system modelling. Due to the complexity of actual investigated objects, models built with individual method are usually not good enough for the problems to be solved. Therefore, a hybrid modelling method based on mechanism and identification is presented in the paper. In the hybrid model, the mechanism model is applied as the fundamental model in order to ensure the overall coincidence performance and the identification model is adopted as the compensated model in order to ensure the accuracy performance. The developing process of the hybrid model of a marine turbo-charged diesel is demonstrated in detail in the paper. Testing result shows that the hybrid modelling method is very suitable for modelling complex investigated objects.
Explore on Digital Restoration of Historic Buildings in Colleges Based on the BIM Concept - As the Example of Jilin Architecture and Civil Engineering Institute Hong Qi Campus
Authors: Han Rui , An Yue Hua , Xie Xin Ying
Published: December 2012

Put building information modeling concept into the historic building restoration field. Restoration by "layer" sequence as the object of building base portion, main structure, electrical and plumbing pipes and building surface information, greatly expand the historic building data information. Through the project practice of digital restoration, we establish a good connection with historical building research and architectural design teaching, and the most important harvest is that it provides a feasible implementation measures for the historic building protection problem in the process of the city industrial structure adjustment, and builds a general platform at the same time.
Simulation Analysis of a PSO-Based Vehicle Collision Avoidance Method under Cooperative Vehicle Infrastructure Environment
Authors: Liu Jiang , Cai Bai Gen , Wang Yun Peng , Wang Jian
Published: December 2012

Vehicle safety is of great importance to improve the capability and performance of the transportation system. To deal with safety threats most probably caused by the vehicle collisions in unsignalized intersections, concept of vehicle infrastructure cooperation provides a perspective and challenging solution to enable sufficient information interaction by V2V and V2I communication, which make it feasible to avoid collisions more autonomously. In vehicle collision avoidance scheme, decision making of vehicle braking control is crucial for emergent situations when safety alerts are not reacted by the driver. In this paper, a novel cooperative vehicle collision avoidance method based on particle swarm optimization is proposed, with an integrated fitness updating criteria considering both safety interval and relative continuity of vehicle deceleration. With a simulation analysis approach, the proposed collision avoiding solution is validated in a real road oriented scenario, and the results demonstrate its effectiveness and advantages to reduce collision and achieve safety assurance under cooperative vehicle infrastructure environment.
DMFSsim: A Distributed Metadata File System Simulator
Authors: Wu Qi Meng , Xie Ke , Zhu Ming Fa , Xiao Li Min , Ruan Li
Published: December 2012

Parallel file systems deploy multiple metadata servers to distribute heavy metadata workload from clients. With the increasing number of metadata servers, metadata-intensive operations are facing some problems related with collaboration among them, compromising the performance gain. Consequently, a file system simulator is very helpful to try out some optimization ideas to solve these problems. In this paper, we propose DMFSsim to simulate the metadata-intensive operations on large-scale distributed metadata file systems. DMFSsim can flexibly replay traces of multiple metadata operations, support several commonly used metadata distribution algorithms, simulate file system tree hierarchy and underlying disk blocks management mechanism in real systems. Extensive simulations show that DMFSsim is capable of demonstrating the performance of metadata-intensive operations in distributed metadata file system.
Different Types of Association Rules Mining Review
Authors: Tan Jun
Published: December 2012

In recent years, many application systems have generate large quantities of data, so it is no longer practical to rely on traditional database technique to analyze these data. Data mining offers tools for extracting knowledge from data, leading to significant improvement in the decision-making process. Association rules mining is one of the most important data mining technology. The paper first presents the basic concept of association rule mining, then discuss a few different types of association rules mining including multi-level association rules, multidimensional association rules, weighted association rules, multi-relational association rules, fuzzy association rules.
Finite-Time H∞ Consensus of Multi-Agent Systems with a Leader
Authors: Mo Li Po , Zhang Han Yu , Hu Hai Yang
Published: December 2012

This paper is focused on the problem of finite-time H-infinity tracking control for the uncertain multi-agent systems with a leader. First, a nonlinear finite time H-infinity tracking control protocol is proposed for multi-agent systems. Second, it is proved that the given protocol can make the closed system reach consensus in finite time based on the theory of finite-time Lyapunov stability and the theory of robust H-infinity control theory. Finally, the simulation results are presented to illustrate the effectiveness of the obtained results.
Illumination Invariant Face Recognition Using Nonlocal Total Variation in Logarithmic Domain
Authors: Xu Cheng Zhe
Published: December 2012

This paper presents a new illumination normalization method for robust face recognition under varying lighting conditions. In the proposed method, the illumination component is estimated by applying nonlocal total variation model in the logarithmic domain, and then the reflectance component is obtained based on reflectance model. The proposed method restrains the halo effect effectively while preserves the adequate texture information on the reflectance images. As an illumination invariant facial features, the reflectance images are directly utilized for face recognition. Experimental results on Yale face database B and CMU PIE database show that the performance of proposed method is robust and reliable in illumination invariant face recognition.
Optimal State Feedback Control in Operator Domain for Multi-Rate Networked Control Systems with Long Time Delay
Authors: Wang Yan Ping , Zhu Qi Xin , Li Zhi Ping
Published: December 2012

By multi-rate networked control systems (NCS), we mean the sampling periods of the sensor, the controller and the actuator in networked control systems are not the same, that is to say there are more than one sampling rate in networked control systems. For the long time delay multi-rate NCS with event-driven controller and actuator, a stochastic discrete model is established under operator. The state feedback control laws for the multi-rate NCS in operator domain are designed by using a dynamic programming approach. The derived optimal LQG controller can be used as a delay-compensator for multi-rate NCS with long time delays. An example is given to verify the theory results of this paper.
Wet Gas Over-Reading Characteristic Research of Inside and Outside Tube Differential Pressure Flowmeter
Authors: Fang Li De , Wang Xiao Jie , Li Xiao Ting , Pang Li Li , Liang Yu Jiao
Published: December 2012

This paper designs a new type of the inside and outside tube differential pressure flowmeter based on the traditional flowmeters. Its structure is introduced and its theoretical formula is induced. For the online measurement of wet gas, this paper has done a lot of simulate experiments on the standard experimental platform. Applying origin drawing tools, it has drawn the relationship curves between influence parameters and over-reading specific value. And then, it analyzed the influence of different characteristic parameters. Finally，proceeding from the basis of over-reading theories，it has explained the internal reasons for these phenomenon.
Research on the Model of Intelligence Redundancy Gateway System
Authors: Ju Hong Yao , Wang Xin
Published: December 2012

It is one of key elements, which makes network high service and stability, to improve intelligent degree and automatic disaster recovery capability of access gateway system .Working state remote monitoring of access gateway, management and control technology are studied, including remote collection and analysis of gateway working state, realizing integration with management and control technology of power, solving working state real time monitoring of access gateway and automatic disaster recovery. Therefore, intelligent auto-control of access gateway system is realized. With system test, the intelligent redundancy gateway system model can improve access gateway early warning and disaster recovery ability obviously.
Correct the Extreme Properties of Mono-Attribute Dependability
Authors: Meng Qing Quan , Kan Jun Ling
Published: December 2012

The relationship was analyzed among dependability of core attribute and other mono-attributes in terms of mono-attribute dependability and the definition of core attribute based on the method of discernibility matrix to find the core, and the correction was made that the mono-attribute for maximum dependability is not always the core attribute through theory and practice, the value of mono-attribute dependability is independent of its classification capacity on the basis of previous study on the summary of the two extreme properties of mono-attribute dependability.
Imploved Real Quantum Evolutionary Algorithm and Application
Authors: Chen Jian Cheng , Tu Ang Yan
Published: December 2012

This paper proposes an improved evolutionary computing method called an improved real quantum evolutionary algorithm (IRQEA) based on analysing the traditional quantum evolutionary algorithm. Quantum chromosomes are divided into real components andprobability amplitude components in IRQEA. One real component shows one candidate real solution obtained the optimal solution by gauss variation. Probability amplitude components maintain the population diversity through trigonometric function changes and realize more candidate solutions by less chromosomes, so as to achieve the algorithm’s better optimization abilities. Through the simulation experiments of seven common functions obtaining the optimal values ,it shows that IRQEA have many good characteristics,such as fast convergence rate and best performance.
Discussion on the Reclosing Coordination of 3/2 Circuit Breaker Connection Mode
Authors: Dou Li Juan , Sun Xin Xin , Jia Yong Kang
Published: December 2012

To ensure power supply reliability, 500kV EHV power system mainly uses 3 / 2 circuit breaker connection mode. However, due to 3 / 2 breaker protection devices caused more complex secondary circuit and relay configuration, therefore, the coordination between circuit breaker protection and reclosing devices becomes prominent issues. This article take the wiring diagram of 500kV TP substation for example, discussed the problems of the line – transformer strings and the line – line strings of reclosing coordination under the 3/2 breaker connection mode. Finally, gives suggestions to improve circuit breaker protection and reclosing coordination, hoping to improve the system stability and reliability effectively.
Error Compensation of Stator Resistance Estimation in Sensorless Induction Motor Drives
Authors: Li Zi Cheng , Yin Zhou Ping , Zeng Li
Published: December 2012

This paper proposed a method of stator resistance estimation for sensorless induction motor (IM) drives based on a model reference adaptive system (MRAS). In this scheme, the error between estimated stator current and real stator current is regarded as the system error to estimate the rotor speed. Because of the motor parameters vary with inner temperature of the motor, the influence of motor speed estimation due to stator resistance identification error was analyzed. The error compensation method for stator resistance estimation was proposed. The algorithm is given to compensate the stator resistance deviation, which results in the speed estimation error. Simulation and experimental results show the good performance for the proposed scheme in speed and robustness for sensorless induction motor drives.
Control System Design for Tracked Trailing Mobile Robot
Authors: Zhu Rui , Xu Hong Chuan
Published: December 2012

In this paper a tracked tracing robot has been investigated and M30245 is used as system core to build its motion control system. A motion control system specifically fitted the differential drive nature of the tracked mobile robots, has been proposed. In this paper, tracing tracked robot based on the structural design, the design of driver module, detection module, control procedures are carried out. The PWM DC motor control technology is discussed; the track sensors, ultrasonic sensors, color sensors, light sensors, temperature sensors and other detection devices are used. Combination of control system the software is designed so that the robot can walk along the designated trajectory, bypass obstacles, test the temperature of the surrounding environment and brightness, then identification and response.
Research about a High-Sensitivity Automatic Liquid Manometer
Authors: Li Xiang Jun , Wang Wei , Ma Zhan Jun
Published: December 2012

An automatic liquid manometer which operates on the basis of a position-detecting system is described. A slanting laser beam is directed to the meniscus of liquid in a glass tube manometer without a float and is reflected by the meniscus. The reflected spotlight is focused on a position-sensitive detector (PSD) through a lens. The application of external pressure to the manometer causes the position of the meniscus to change, and the pressure can be gotten indirectly by this position. The relationship of the output of PSD to the displacement of meniscus was investigated, and the fuzzy control rules were determined to make the meniscus back to its original position fast and stable. The system has been tested with good results.
Identification of Two Degree of Freedom Robot Arm’s Joints’ Time-Varying Stiffness
Authors: Xu Rui , Chen Qiang , Yang Guo Lai
Published: December 2012

This paper is concerned with the identification problem of two degree of freedom robot arm’s joints’ time-varying stiffness. The dynamic equation of two degrees of freedom robot arm can be obtained by using analytical mechanics method. Then by choosing limited memory least square method, time-varying stiffness can be identified. Finally, the calculative stiffness is compared to the “real” stiffness which is simulated in ADAMS. The whole process shows that the robot arm’s dynamic model and the method of identification are both effective.
The Mobile Robot Navigation System Design Based on GPS and GIS
Authors: Yan Dang Hui , Zhao De An , Shen Hui Liang
Published: December 2012

The paper develops an autonomous navigation system with Visual C++ 6.0, combining all-terrain and all-weather mobile robot platform with the high-precision dual-frequency RTK-GPS. The intelligent mobile robot achieves autonomous navigation control. Owing to the four-wheel drive, path tracking is better implemented; Owing to the use of high-precision GPS, position locating is more accurate; Owing to the multithreaded design of the program, real-time requirements of the navigation is better achieved; By the way of map matching of GIS, the path tracking is real-time and the navigation of the robot is more visual and intuitive. The result of experiment shows that this navigation system can meet the requirements of accuracy and real-time and complete the navigation task very well.
Simulation and Application of PLD in Electric Power System Circuit
Authors: Liu Cheng , Li Zhe , Hou Jia Jia
Published: December 2012

Programmable Logic Device(PLD) has been widely used in hardware circuit, and it has evolved into two types: Complex Programmable Logic Device(CPLD) and Field Programmable Gate Array(FPGA). This paper takes small current grounding in electric power system as background, uses xc95144, a representative CPLD of Xilinx Company in the signal collecting circuit to collect voltage and current signals, and do some other operations to spare circuit board area. This paper also tries to translate the schematic into VHDL-described text and do simulation to the text.
Design and Implementation of the Management Platform for Electric Vehicle and Charging Electric Facilities
Authors: Song Wei , Chen Xin He
Published: December 2012

In order to achieve the management of electric vehicle and related operating facilities to solve the problem that the information of different electric vehicle charging stations cannot be shared, the problem of information silos, this paper designs and implements the CAN bus based electric vehicle charging station management platform, this platform can monitor electric vehicle and facilities, collect real-time data and make analysis and statistics to solve the problem of information silos of electric vehicle and charging exchange power facilities information sharing and reduce the effect of electric vehicle charging to grid. This platform using Struts, Hibernate and Ajax technology. This platform has been applied to Chengdu charging station, which proves the feasibility and effectiveness of the platform.
The Empirical Study in Smart Power Consumption Based on the Adjustment and Control System
Authors: Huang Kun , Li Tian Yang , Yang Yong Biao
Published: December 2012

The smart power consumption is an important orientation in peak load shifting and load shedding of power grid in particular time period. It has the significant effect to relieve the load shortage of the power grid. The large-scale electrical devices like central air-condition in commercial building have the great potential in the energy efficiency improvement and available load integration. The effectively regulation of power load in public and commercial construction can improve the stability and reliability of power grid. The power situation in china and the content of empirical study were introduced, and the system hardware design and software platform construction is demonstrated. The function modules of software platform and realization of regulation system are discussed in final.
Reserch on Traffic Congestion Detection Using Realtime Video
Authors: Xu Ling , Ba Qun , Hu Shan
Published: December 2012

To detection the realtime information of the traffic congestion on the road, a method based on realtime video analysis was present. The method, firstly figure out the density of the vehicles on the lane, and then calculates optical flow velocity vetors of corner points on vehicles, finnaly, judges the current condition of the traffic flow by fuzzy logic based on the conditions of denisty and velocity. The proposed method is capable to accurately and timely detect the status of traffic congestion.
Design and Implementation of Vehicle Self-Navigation System in Urban Intelligent Traffic
Authors: Zhu Hong
Published: December 2012

Compared with the single sensor measuring, the complementary measuring with the dual sensor can solve some key problems in the vehicle self-navigation system. Two sensors’ data must be fused by the federal state estimator. Based on the Singer model, the system equation of Dead Reckoning sensor is nonlinear and the system equation of Global Positioning System sensor is linear. A two-level estimator is designed and implemented in such a way that two local estimators process the linear and nonlinear systems respectively, and the main estimator fuses the data from two local estimators, so that the optimal global state variables can be estimated. The simulation results show that the two-level estimator of dual sensor can increase the vehicle’s self-navigation precision and can be applied in urban intelligent traffic.
Vehicle Body and Wheel Motion Simulation Platform Based on LabVIEW
Authors: Li Hai Feng , Luo Yu Zhi , Zhang Xiao Long , Pan Deng
Published: December 2012

The work in the paper constructed a platform for vehicle’s controllability and stability study conveniently and efficiently. Based on the dynamic model of the two-mass vibration system of vehicle body and wheel, the paper builds a vibration platform using the graphical programming software LabVIEW. It establishes a sinusoidal input road surface model, simulates the sinusoidal road surface under different amplitude and frequencies, and makes it the excitation source of the vibration system. It also obtains the curves of the amplitude-frequency characteristic of vehicle body and wheel displacement on the pavement displacement, and the time-domain response and amplitude-frequency characteristic curve of the body acceleration, suspension spring dynamic deflection and wheel relative dynamic load. This simulation platform provides an intuitive and effective method for vehicle ride comfort both in time domain and frequency domain.
Knowledge Fermentation Feedback Control Research in Sprayer Innovative Design on the Basis of Rapid Prototyping
Authors: Zhang Shang You , Zhang Tian Hui , Gu Li Chun , Guo Li , Xu Ren Ping
Published: December 2012

It was analyzed for the four feedback control modes of knowledge fermentation containing non-feedback, negative feedback, partial feedback and adaptive feedback during the product innovation and design process. It was puts forward that rapid prototyping in the knowledge fermentation feedback control can quickly and efficiently promote knowledge digestion, knowledge conversion, knowledge growth and knowledge spread and product innovation can be accelerated. The case study of sprayer product innovative design and development has illustrated that, it is the most effective product development mode to employ knowledge fermentation adaptive feedback control based on the rapid prototyping which can provide rapid prototyping mold to be catalytic effect. Rapid prototyping can get the error value between outputting knowledge and target knowledge accurately and directly and offer feedback of knowledge fermentation timely. Accordingly it furthers the fermentation knowledge to the target knowledge, and ultimately finishes product innovation.
Applied Research on 3D Modeling Technology in Material Design
Authors: Jing Xing
Published: December 2012

Focusing on three kinds of 3D modeling technologies, AUTOCAD, ANSYS and FLAC3D, and their respective characteristics, and using effective interfaces of them, the paper introduced a modeling method of visual model, grid model and mechanical computation model for material design, and selectd a corresponding example using the method to make computation. Trial computation results showed the material model’s stress response under applied load: the maximum stress produced in the material model was 1.27e7Pa; the minimum stress was 1.02e7Pa; the maximum velocity response produced in the material model was 9.997e-6m/s; the material suffered no yield failure.
A Consumption Authenticator Based Mechanism for Time-of-Use Smart Meter Measurements Verification
Authors: Camara Sergio , Machado Raphael , Carmo Luiz F.R.C.
Published: December 2012

Energy meters have become smart and functionally powerful over time. Still many concerns about the correctness of their behavior are raised by society and the effort involved on new smart meters type approval are growing huge. Aiming at establishing trust on the smart meter, this paper proposes a consumption authenticator which can be read from the meter's display and verifiable by the user. This authenticator is generated inside a secure device, placed on the metering module, using ECPVS signature scheme providing partial message recovery. Since our approach considers different Time-Of-Use scenarios, a composing technique for the authenticator's embedded message is presented. Our concerns are the necessary data for validating Time-Of-Use rates measurement values and the final size of the message.
Theoretical and Experimental Study on Flat Optical Comb Generation Based on Re-Circulating Frequency Shifter
Authors: Song Ying Xiong , Li Hai Ning , Li Ying Chun , Han Jing Long , Duan Xin Xin
Published: December 2012

A complete analysis of flat and stable optical comb generation based on the re-circulating frequency shifter has been analyzed and demonstrated in this paper. We find out the influence to the flatness of optical comb owing to amplifier relative intensity noise and modulator relative factors imperfect, such as input RF signals amplitude and phase deviation and modulator defect owing to manufacture for the first time. Moreover, to verify the theoretical analysis, a 16 comb lines and spacing 12.5 GHz RFS generation system have also been carried out, and the results are in good agreement with the theoretical analysis results.
Research of Video Signal Generator in Aircraft Based on FPGA+DSP
Authors: Jia Yin Liang , Gao Jing
Published: December 2012

Video signal generator in aircraft needs fast calculation speed and current generators usually are not suitable. This paper proposed a new generator based on FPGA+DSP. FPGA generated graphics using double frame buffers while DSP calculated a few parameters. We offered general functions library on host computer to design graphics. The generator overlapped graphics and video. By accelerating the graphics drawn by FPGA, the generator improves performance and simplifies program.
Exploration and Practice for Virtual Local Area Network (VLAN) Technology
Authors: Zhao Lian Feng
Published: December 2012

VLAN technology refers to the virtual local area network technology, which is classifyd into several network segments in logic through the internal devices of existing LAN, rather than physical location, so as to realize a computer network technology of virtual working group. This paper analyzes and studies on the generation, characteristics, and communication method of VLAN technology, as well as its actual application and setting.
Analysis on Network Security and Corresponding Preventive Measures
Authors: Chen Jing
Published: December 2012

Network security is one of the most important issues in the face of Internet development. Major researches are done on improving the current status of the security of internet. This article describes some major factors threatening internet, and analysis the latest security techniques. corresponding strategies are proposed to achieve a safe, worry-free environment online.
Study on Acoustic Communication Methods in Periodic Tube Structure
Authors: Li Zhi Gang , Shu Wen Jie , Guan Zhi Chuan , Huang Ming Quan
Published: December 2012

With many periodical discontinuous boundaries, periodic tube structure is prone to inter-symbol interference in acoustic communication. To look for the appropriate communication method and improve the quality of acoustic communication in the structure, experiments were carried out in the real periodic structure using raised cosine ASK, FSK and BPSK modulation respectively. The results show that：in periodic tube structure, ASK, FSK, and BPSK all can realize normal acoustic communication in the condition without noise or the noise is weak. Raised cosine ASK modulation can better use transmission power and get the highest data rate (up to 65.7Kbps in the experimental structure) in un-noise environment. BPSK has the best noise immunity in the condition with noise. So, the BPSK is more suitable for the actual acoustic communication in periodic tube structure in the actual environment.
A Traffic-Flow-Phase Adaptive Routing Algorithm for VANETs
Authors: Li Da Wei , Wang Ping
Published: December 2012

Vehicular ad-hoc Networks (VANETs) has become a hot topic in recent years, where the routing protocol has also become research focus. The vast majority of the existing routing protocols are designed for a single scenario, thus it is difficult for them to be extended for the complicated traffic environment. In this paper we propose a new routing algorithm X-CAST for vehicular communication on highway, which can be adaptive to different phases of traffic flow and guarantee reliable transmission in different environments. The experimental results reveal that X-CAST performs much better than other traditional routing protocols in complex traffic flow situation.
A XSS Defensive Scheme Based on Behavior Certification
Authors: Xu Hua Jie , Hu Xiao Ming , Zhang Dong Dong
Published: December 2012

The Scripting languages (mostly JavaScript) applications in the network are heavily used to improve the user experience now. The trends make XSS (Cross-site Scripting Attacks) the most serious security problems in the current Internet. A XSS defensive scheme based on behavior certification is proposed in the paper. The website behavior model is generated based on the website logic and the user behavior. The browsing behavior certification is implemented based on the expected behavior of the resulting model, so as to offer security for the client even in the case that web server has suffered XSS attacks.
Group-Activity Based Access Control Model for Manufacturing Grid
Authors: Ge Zhi Hui , Li Tao Shen
Published: December 2012

In order to protect the sensitive information in collaborative manufacturing grid environment, an access control solution was proposed to satisfy the inherent dynamic natures of the manufacturing grid, including dynamic business flow and system environment. Activity is introduced to encapsulate role and permission. Activity state, activity hierarchy and activity dependence are used to provide dynamic authorization and flexible multi-granularity privilege management, which can get adapted to the dynamic, flexible modern business process. UNIX-like permission can guarantee default minimum read/write/delete permissions. This proposed model can meet the need of manufacturing grid.
An Authentication Scheme for XOR Network Coding Based on Network Lifetime
Authors: Jiang Guo Sheng , Qin Tuan Fa , Tang Zhen Hua , Sun Guang Hao
Published: December 2012

An efficient authentication planning for XOR network coding is proposed in this paper, which is based on the network lifetime. The lifetime of a network is defined as the number of communication until the first node failure due to energy depletion. The planning aims at balancing the energy consumption of nodes and extending the network lifetime by dynamic adjusting the processing of nodes. Unlike traditional network coding authentication planning, the planning considers the network lifetime as performance index, not the overall energy consumption of network. Experimental results show that the planning can improve the network lifetime when compared with the existing one.
Binomial Bit-Rate Computation Model Based on Wireless Channel
Authors: Yang Wei Ming , Zhang Jian , Peng Jin Xiang
Published: December 2012

For the encoding bit-rate problem in H.264 wireless video communication, the bit-rate computation model and the standard deviation distortion model were analyzed to establish the relation between the quantization parameter of encoding bit-rate and the intra-frame refresh rate of macroblocks, a new proposal of the coding rate thus put forward based on the general binomial computation model theory. Furthermore, this method not only can adaptively adjust the bit allocation and quantization parameters to prevent buffer from overflowing downward or upward under given network bandwidth, but also can apply the rate-distortion to perfect the solution method, control the encoding bits accurately and optimize the allocation between the inter-frame encoding macroblocks.
Physical AWGN Channel Emulator for Bit Error Rate Test of Digital Baseband Communication
Authors: Boscolo Antonio , Vatta Francesca , Armani Francesco , Viviani Emanuele , Salvalaggio Daniele
Published: December 2012

This paper presents a physical channel emulator solution for applications such as Bit Error Rate Testing of Error Correcting Codes. The solution relies on an analog White Gaussian Noise Generator coupled additively with an analog data signal to emulate the communication channel. This is interfaced to a computer through a USB connection, allowing the use of programs in different environments, such as Matlab and Labview. This solution can allow different types of channels to be emulated and with different noise sources. A software-based method to measure Signal to Noise Ratio and to characterize the channel is also presented. The system has been validated using a Matlab interface implementing multiple error correcting codes and showed good agreement with the theoretical model.
The Design of ZigBee Wireless Network for the Detection Platform of the Cylinders
Authors: Li Yan , Gu Qiao Xiang
Published: December 2012

The equipment, called detection platform of the cylinders, is used for detecting cylinders so that cylinders can be at ease use. In order to transmit the real-time detection data to PC for further processing, the platform should be connected with PC. Cable connection, in some production and environmental conditions, is limited. Under the circumstance, building wireless network is the better choice. Through comparative studying, ZigBee is chosen to be the technology for building wireless network. ZigBee chip and ZigBee2006 protocol stack are the core components in the ZigBee nodes.
Emergency Decision System for Surface Gathering and Transporting of CBM Based on Technologies of 3G Wireless Video Monitoring and 3S
Authors: Wu Jian Hua , Rui Xiao Ping
Published: December 2012

Considering the security demand of gathering and transporting coal bed methane in Shanxi Panhe area, integrated technologies of 3G wireless video monitoring system and 3S, developed emergency decision system for surface gathering and transporting of coal bed methane. Designed system architecture, function and database, finally, developed the system based on ArcGIS Engine in the .NET development environment, and realization methods of system’s key functions such as video monitoring, GPS monitoring, gas leakage simulation, fire simulation, debris flow simulation were discussed. Implemented remote monitoring and emergency command and dispatch through multi-source geo-spatial data, GPS information and video-audio messages, thus provided the intuitive basis for science decision-making, it is worthy to be popularized in emergency command area.
Survival Situation Awareness Based on Multi-Feature Fusion
Authors: Zhao Jin Hui , Shuo Liang Xun , Qian Xu
Published: December 2012

A hierarchical model of survival situational awareness is proposed based on multi-feature fusion, which includes three layers: feature fusion layer, situation assessment layer and comprehensive perception layer. In the feature fusion layer, light-computation features and efficient fusion mechanisms are employed to improve degree of differentiation. Situation assessment layer adopted fusion technology of variable fuzzy set theory to improve the accuracy and objectivity of evaluation. Furthermore, time series of services are introduced to judge the safety states and predict the trends in comprehensive perception layer. Experiments indicate that proposed model is more scientific and more accurate, which is valuable for generalizations and applications.
The Database Design Based on Native XML Database Technology
Authors: Wang Lian Sheng , Li Ting Jun , Sun Tao , Liu Zhi Yong , Sun Xiao Dong
Published: December 2012

IETM database standardized on S1000D consists of XML documents. In view of former relational database treat XML documents defectively, design storage and index pattern of IETM database which is based on features of module and information object standardized on S1000D with relational XML database technology. There is a certain significance to broaden.