bluuebunny/crossref_metadata_2025 huggingface dataset:
Approach to Energy Optimization Axiomatic Design Based on Design Unite
Authors: Zhou Dan , Liu Guang Fu , He Ping
Published: October 2011

Under the control of energy efficiency model C, design unite (DU) changes function F to state S through design progress P. Thus, the target of energy optimization is achieved by gain the F in a lower cost of energy. In order to make energy efficiency model C used in design progress more easily, the EDF’s optimization target T and energy consumption influence modulus M is added to C. In the process of energy optimization axiomatic design, DU changes the initial customer’s requests to product’s physical modules in a decomposing process and its content is transformed from asthenia to sthenia. DU’s function F is decomposed and defined at the guidance of independence axiom. And the optimal solution is selected at the operation of information axiom and energy efficiency model C. By the end of this paper, the contrast of energy optimization degree in each design stage is detailed.
The Heat Exchange and Stress Distributing of Expansive Soil in Site
Authors: Wei De Jian , Zhang Xin Gui
Published: October 2011

Expansive soil is called as “problem soil”, which has a characteristic of swelling by absorbing water and shrinking by losing water. So buildings and sub-grade which are built on expansive soil, are easier to damage for lager deformation. Due to the large-scale urban construction, ground surface was covered in a wide range. For example, in tropics and subtropics areas, the water transfer in the expansive soil is influenced by the gradient of temperature, which is different between the central area under the road surface and road-side bare area. Because of the hysteresis of water transfer, the water content distributing is not uniform, which lead to the different swell-shrink performance in different zone, herewith will change some parameters of the expansive soil and finally affect its stress field and the displacement field. Take the road as the example: The road is a strip belt-shaped coverage. Both in dry and wet season, the thermodynamic field and water-flowing field is uneven between the central area under the road surface and road-side bare area, so the displacement field and the stress field on the cross-section under the road is uneven. Under the load of vehicle, the non-uniformity stress distributing in the soil is further aggravated, and the same to the displacement in the underlying sub-grade, which is a significant factor in aggravating the dehiscence of road surface. Comparing to general soil, expansive soil has a completely different distribution of temperate field and water-flowing condition because of its swell-shrink characteristic. By studying on the relationship between the thermodynamic field and the stress-strain in the expansive soil, it can find out how the climate affect the engineering expansive soil, and provide the theory basis for improving expansive soil.
Mesurment Instrument of Quantitative Fluorometry Intensity Based on Stoke’s Shift
Authors: Zhang Chi Jun , Wu Qiong
Published: October 2011

Mechanism of fluorescence stoke’s shift is discussed in detail in this paper. Optical wavelength of pumping laser is determined based on stoke’s shift, which puts forward the theory foundation of film-coating technology. A new kind of developed medical quantitative fluorometry is introduced. Its measured principle, mathematics model, key optical technology and its applied prospect are described also
Numerical Analysis of Spraying Hole Improving Permeability and its Application in Outbursting Coal Seam
Authors: Yun Bao Ju , Cheng Yuan Ping , Liu Jian Zhuang , Li Xue Jing
Published: October 2011

Based on the coal and methane outbursting theory, we use FLAC3D to analyze the stress and strain distribution rules in coal body around the spraying holes. The simulating results are so appealing to help us to optimize spraying holes lay out in Qinan Coal Mine’s Face 713. The on-site drainaging records indicate the numerical results is reasonable and practical, and spraying holes laying is effective to improving the methane permeability.
Minimality and Closeure of Random Exponential Systems
Authors: Yan Feng , Liu Xiao Ling , Zhang Su Mei
Published: October 2011

In this paper, we study the minimality properties of random exponential systems in , where is a weighted Banach space of complex continuous functions of on with vanishing at infinity, in the uniform norm with respect to the weight . We prove that, if is incomplete in , then is minimal and each function in can be extended to an entire function respresented by a Dirichlet series.
Adaptive Sliding-Mode Control with Self-Tuning Fuzzy Compensation for a Piezoelectric-Actuated X-Y-Z Table
Authors: Liang Jin Wei , Chen Hung Yi , Wu Chia Zung
Published: October 2011

This paper aims to develop and implement intelligent control for a X-Y-Z three-dimensional table using linear ultrasonic motors as the actuators. Functional approximation technique (FAT) is integrated with the sliding-mode control design to capture the unknown system dynamics and release the requirement of mathematical modeling. In order to deal with the approximation error and the uncertainties of the system, an adaptive fuzzy sliding-mode controller (AFSMC) is used as a compensation of the FAT-based sliding-mode control. Lyapunov stability theory is applied to assure the closed-loop stability and design the updating laws for weighting coefficients of Fourier series and fuzzy tuning parameters. Experimental results indicate that FAT-based sliding-mode control augmented with AFSMC compensation (FA+AFSMC) performs better than the solely FAT-based sliding-mode control.
Comparison of Different Controllers for Automotive Electronic Throttle Based on Rapid Control Prototype Technique
Authors: Ye Xian , Peng Yi Qiang , Hui Yan Cui
Published: October 2011

Due to some nonlinear factors and time delay in electronic throttle, the opening of electronic throttle is difficult to control. For overcoming these difficulties, in this paper a fuzzy adaptive PID controller is designed for an electronic throttle control system. The model of electronic throttle control system is built based on Matlab/Simulink and realized with a hardware-in-the-loop simulation system, which is based on MACS565. Simulation research and experiment results show that, compared with PID control system, the fuzzy adaptive PID control system, has some advantages. The all performance index with the fuzzy adaptive PID control is better than that of the PID control.
Direct Adaptive Control of Faulty UAVs via Quantum Feedforward and Fuzzy Feedback
Authors: Chen Fu Yang , Jiang Bin , Jiang Changan
Published: October 2011

In this paper, the control law designing of longitudinal-lateral attitude and faults self-repairing against the UAVs are analyzed. The direct adaptive controller via fuzzy feedback is designed to guarantee the UAVs stabe and having good flying performance. Then, a new direct adaptive control method is formulated by quantum control technique. Consequently, not only the stable error but the property of response and robustness is improved well. Simulation results are given to illustrate that a good dynamic performance of the flight control system with large faults can be maintained with the proposed control method.
Modeling and Control of Forward Converter
Authors: He Qiang
Published: October 2011

The average model of the forward converter is build with the state-space average method. The open-loop transfer function model is deduced in detail according to the average model of the forward converter, the controller is designed based frequency domain by the type III compensation network. And the stability of the control system has been improved. The modeling and simulation of system was implemented based Matlab. The results of simulation confirm that the controller is capable of reduced steady state error and improve controller's reliability during power supply disturbance and load disturbance．
Fatigue Damage Characterization of Magnesium Thick Plate Using Nonlinear Rayleigh Wave
Authors: Su Shan , Yan Bing Sheng
Published: October 2011

In order to extend engineering application of nonlinear ultrasonic nondestructive testing technique in wave structure, an experimental technique for excitation and reception directly of Rayleigh wave by fixing piezoelectric sensor on the edge of the specimen is presented. Using the experimental system and procedure, the surface fatigue damage of AZ31 magnesium thick plate is detected by nonlinear Rayleigh waves. Although the experimental results have some dispersion, the ultrasonic nonlinearity parameters overall increase apparently with the fatigue cycles increasing, which demonstrates the Rayleigh wave nonlinearity parameters are sensitive for the changes of microscopic defects in the materials internal, and the experimental system and procedure are reliable. The Rayleigh wave nonlinearity parameters for the thick plate structure fatigue life prediction have potential engineering applications.
Half-Band Filter Design Based on MATLAB and FPGA
Authors: Wu Jun , Zhang Chao Fan
Published: October 2011

Half-band filter is a linear phase FIR filter, which is symmetric-even and odd .Because the coefficient of half-band filter is symmetrical and nearly half of the coefficient are zero, it make the filters reduce the number of multiplication operations by almost 3 / 4, and the number of addition operations by nearly half . The memory used to store filter coefficients are also reduced by half, so it make the implementation of efficient real-time digital signal processing more conducive. The half-band filter has many characteristics: for instance, simple structure, easy to implement and excellent performance, it is widely used in multi-rate system. This paper first describes the principle of half-band FIR filter, the character and method for implementation, then puts forward the design and simulation process which is based on MATLAB and Xilinx's half-band filter, and at last analyses the result.
Performance Evaluation of Engineering Project Risk Based on Factor Analysis
Authors: Kai Cui
Published: October 2011

based on factor analysis of multivariate statistical analysis, aim directly at Enginering Project management practice, establishment the index system of Engineering Project performance evaluation, and use the SPSS software make a factor analysis of the data of Engineering Project, the final order factor score make evaluation value of the Engineering Project performance. This article studies the performance of Engineering Project risk provides a reasonable, practical feasibility of approach.
Realizes Data Structure and the Algorithm Dynamic Synchronized Visualization
Authors: Yang Xiao Bo , Chen Bang Ze
Published: October 2011

Data structure and the algorithm teaching difficulty lies in their abstractness and the dynamic, teaches in the classroom uses the graphical representation to be possible to melt to a certain extent as intuitively, but very difficult to unfold the object the instantaneous dynamic characteristics and the algorithm dynamic implementation. This article utilizes the visualization programming technology, object-oriented technical and the computer graph processing technology carries on the dynamic interactive simulation track to the typical algorithm, has realized the abstract construction of data and the algorithm dynamic synchronization visualization. Each kind of abstract data type (ADT) definition and realization concise clear, vivid direct-viewing show abstract data structure, adequately demonstrate classical algorithm dynamic and execution detail process.
An Continuous Wavelet Transform-Based Detection Approach to Traffic Anomalies
Authors: Jiang Ding De , Yao Cheng , Xu Zheng Zheng , Zhang Peng , Yuan Zhen , Qin Wen Da
Published: October 2011

Anomalous traffic often has a significant impact on network activities and lead to the severe damage to our networks because they usually are involved with network faults and network attacks. How to detect effectively network traffic anomalies is a challenge for network operators and researchers. This paper proposes a novel method for detecting traffic anomalies in a network, based on continuous wavelet transform. Firstly, continuous wavelet transforms are performed for network traffic in several scales. We then use multi-scale analysis theory to extract traffic characteristics. And these characteristics in different scales are further analyzed and an appropriate detection threshold can be obtained. Consequently, we can make the exact anomaly detection. Simulation results show that our approach is effective and feasible.
Application of Image Enhancement Algorithm in Multi-Phase Flow CT System
Authors: Ma Min , Ji Jing Jing , Zhang Cai Xia
Published: October 2011

In this paper, image enhancement algorithm is applied to multi-phase CT system imaging. Aiming at artifact imaging of multiphase flow CT system image reconstruction, this paper uses image enhancement algorithm to enhance the reconstructed image. The simulation results prove that with a small amount projection angle data about reconstruction it can also get clear images by using image enhancement algorithm processing and also remove artifacts for reconstructed image. It is efficient to shorten the multi-phase CT system image reconstruction data collection time, and benefit to analysis multi-phase transient flow pattern.
On Image Decompression with Embedded Characteristic Information
Authors: Li Xiu Zheng , Yang De Yun
Published: October 2011

Since the internet has become a main method of image's transmission and storage, how to prevent illegal diffusion for some images deserves wide attention and discussion. This paper introduces an effective method of registering the decode program with the personal characteristic information. To guarantee the ownership and the integrity of the image data, with processed chaotic sequence or random sequences, the installation procedure produces distinctive registering numbers which indicate the users’ information.
Influence of BaB2O4 Glass on the Synthesis of Ba2Ti9O20 Ceramics
Authors: Xiao Mi , Jia Cui Ran , Liu Chao , Yu Ming , Song Qiang
Published: October 2011

The effects of BaB2O4 glass on the synthesis of Ba2Ti9O20 were studied. The doping amounts of BaB2O4 varied from 0 to 10wt% and the compositions were sintered in the temperature range of 1200~1280◦C for 2h. The benefit of BaB2O4 addition to the densification of the ceramics is apparently due to the liquid phase which accelerates the migration of reactant species, which results in the decreasing of the sintering temperature. With the amount of BaB2O4 increased, the microstructure and properties of the ceramics were also changed: BaTi4O9 became the major phase instead of Ba2Ti9O20, bulk density decreased, and dielectric constant decreased accordingly, while dielectric loss kept small.
Overview of Energy Consumption Model for Manufacturing Processes
Authors: Li Bing Bing , Zhang Hong Chao , Ke Qing Di , Ding Li , Zhang Lei
Published: October 2011

The energy consumption for manufacturing processes is the largest impact contributor in various characterization categories, based on the assessment of environmental effects during the whole life cycle. It is necessary to investigate the manufacturing processes in depth to find out mechanism that can improve energy efficiency. This paper presents a comprehensive overview on two important aspects of energy consumption models for manufacturing processes: 1) two data collection methods: top-down and bottom-up; 2) two process-based analytical methods: thermodynamic model (including energy flow analysis and exergy analysis), and mechanical model. These models can improve energy efficiency.
A Method of Reliability Sensitivity Analysis for Gear Drive System
Authors: Li Chang , Zhao Guang Bing , Han Xing
Published: October 2011

Based on profile involutes equation and tooth easement curve equation of standard gear, parameterization three dimensional finite element model of the gear drive system is built up in ANSYS, and numerical computation of the working process is taken in ANSYS/LS-DYNA, then contact stress of and pressure distribution are got. It creates an ultimate state equation of every system parameter (input) converting to output (response), considering different system random error synthetically, sample points locations in input variable sampling space are fixed with the method of matrix experiment design, which was used in series of deterministic fitting test. In the test, least-squares procedure regression analysis of the ultimate state equation is taken to fix the items and coefficients after multiple fitting test. Using this ultimate state equation, system reliability level and reliability sensitivity of different variables can be calculated which provides theoretical bases for dynamic optimum design of gear drive system.
Numerical Model for Collision Damping of Blades’ Tips
Authors: Jin Xue , Zhang Ming Zhi , Li Hong Wei , Zhang Xiao Mei
Published: October 2011

In order to obtain the collision damping of blades’ tips characteristics, around a blades for a 300MW steam turbine, the COMBIN40 element of ANSYS was adopted. The collision damping among blades' tips is equivalent to a damping of spring and friction with a gap. Under the conditions of exciting force and rotating blade natural frequency ,the vibration of a harmonic response was analysed, the nonlinear impact damping of blade response characteristics and the vibration damping mechanism of collision was got.
Numerical Simulation of Precision Forming for Blade Rotor Based on DEFORM
Authors: Liu Fang , Zhang Lu Yun
Published: October 2011

In order to study the deformation characteristics of the blade rotor in the precision forming, by means of the plastic forming software DEFORM-3D, the forming process is simulated. It is concluded that (1) the change of the stress and strain in different stages was simulated during the entire forming process. (2) Based on the stress and strain distributions, the analysis of the metal flow rule and the mechanism of the filling mold was proceeded to find that the properties of the blade rotor can be enhanced by means of the precision forming.
Design and Field Test of Virtual Instrument Based Monitor and Control System for Combine Harvester Automation
Authors: Chen Du , Wang Shu Mao , Ding You Chun , Kang Feng
Published: October 2011

In this study an online monitor and control system was developed and tested based on virtual instrument environment for combine harvester automation. A data acquisition system and control elements were integrated into a self-propelled combine harvester. The following online information was recorded: performance parameters (threshing drum torque, engine speed, operation speed, etc), machine settings (reel speed, knife speed, drum speed, etc) and guidance information. The collected data were integrated into windows-based software for real-time processing. Image sensing information was used for swath detection and obtained results could be transmitted to the actuator for auto steering. The guidance error could be controlled in the range of 0.15 m during road surface test with centerline. The ground speed was adjusted by using the threshing power consumption data to improve work performance during field test. Experiments results indicated that it was possible to use virtual instrument environment based system to monitor operation data and conduct other real-time applications for field operation.
Realtime On-Road Vehicle Detection Approach Based on Cascaded Structure
Authors: Zhang Liang Xiu , Qiu Xu Yun , Zhang Zhu Lin , Wang Yu Lin
Published: October 2011

Realtime on-road vehicle detection is a key technology in many transportation applications, such as driver assistance, autonomous driving and active safety. A vehicle detection algorithm based on cascaded structure is introduced. Haar-like features are used to built model in this application, and GAB algorithm is chosen to train the strong classifiers. Then, the real-time on-road vehicle classifier based on cascaded structure is constructed by combining the strong classifiers. Experimental results show that the cascaded classifier is excellent in both detection accuracy and computational efficiency, which ensures its application to collision warning system.
Research of Tool Wear Condition Recognition Diagnosis System Based on the Machined Workpiece Surface Texture Image
Authors: Xu Wei Dong , Ren Xiao Hong , Li Li Jie , Yue Ying Gao
Published: October 2011

Aiming at the machined workpiece surface texture images,some technology about image pre-processing and the texture feature extraction based on gray level co-occurrence matrix are researched. Then it is time for the analysis of the texture characteristic parameters based on BP neural network and the identification and diagnosis of tool wear state, Finally the recognition diagnosis system interface is designed by Matlab-GUI.System simulation shows that the interface fusion of image processing and neural network is a good way to ensure the realization of tool wear condition recognition,what’more, the identification diagnosis rate is profect.
Research on Facility Layout Problems Based on Ant Colony Algorithm
Authors: Li Hong , Gan Xiao Qing , Ma Li Lin
Published: October 2011

In this paper, we propose a variant of the QAP-based facility layout problem: the fixed-point facility layout problem (FFLP). .Based on Ant Colony algorithm , we design the modified ant algorithm for solving the general facility layout problem (GFLP). In addition, we also design the ant algorithm for FFLP by increasing the operator of data preprocessing. Analyze the impact of the different parameters values on the results by a lot of data testing. Experimental results show that the algorithm has strong capability of global search and rapid speed of convergence.
Optimization Study on Leveling Cylinder Position of Telescopic Handler
Authors: Lu Yong Zhi , Su Zhen Xing , Wei Si Jia , Qiu Wang Biao
Published: October 2011

According to research on the leveling principle of the telescopic handler fork, establishing relevant mathematical model to optimize the position of master cylinder with the optimization algorithm of accumulated error, least square method, and multi-objective programming of method of weighting by using the computer language of VB . Then the position of fork got optimization that stabilizes the level of fork of telescopic handler.
Parameter Estimation of the MISO Nonlinear System Based on Improved Particle Swarm Optimization
Authors: Fan Huai Ke , Lin Wei Xing
Published: October 2011

Nonlinear system identification is a main topic of modern identification. This paper presents a new parameter estimation method of MISO (multiple inputs, single output) Hammerstein model by using improved particle swarm optimization (IPSO). The basic idea of the method is that the model identification problem is converted into optimization of nonlinear function over parameter space. And the swarm intelligence method is used to search the parameter space concurrently and efficiently in order to find the optimal estimation of the model parameter. The basic algorithms of IPSO and the parameter control are discussed. Simulation results demonstrate effectiveness of the suggested method. The advantages of IPSO are easy to implement, few parameters to adjust, small population size, quick convergence ability and so on. Especially in high noise disturbance condition, the results of IPSO are also satisfactory.
Pan-Boolean Algebra for PID Control Method
Authors: Chen Jin , Chen Guan Ling , Wang Zhen Hua , Song Hai Hui , Zhou Jin
Published: October 2011

In this paper, pan-Boolean algebra for PID control concepts, methods and principles is proposed based on theory of Pan-Boolean algebra, Take the deviation of the control system, of the deviation, integral of the deviation as a pan-Boolean algebra PID controller’s input, for the different characteristics of the object and design of different control rules, we can get pan-Boolean algebra PID control algorithm; according to the system Indicators requirements, calculating simulation and optimization design of control algorithm parameters to achieve optimal control for system. The paper also proposed a three-dimensional coordinate system described method for system output response or the control parameters and deviation, deviation differential or deviation integral, this is a profoundly new tool for control system’s moving process features. The paper is important for PID control and application.
An Algorithm for Mining Frequent Stream Data Items Using Hash Function and Fading Factor
Authors: Mei Qing Ling , Chen Ling
Published: October 2011

A new algorithm to mine the frequent items in data stream is presented. The algorithm adopts a time fading factor to emphasize the importance of the relatively newer data, and records the densities of the data items in Hash tables. For a given threshold of density S and an integer k, our algorithm can mine the top k frequent items. Computation time for processing each data item is O(1) . Experimental results show that the algorithm outperforms other methods in terms of accuracy, memory requirement, and processing speed.
Design of Semi-Physical Simulation for Small Satellite by Virtual Display
Authors: Xu Kai , Lv Yan , Jin Guang
Published: October 2011

Semi-physical simulation of attitude control system is the more synthetically test and verify for designing of small satellite control system. It is an important means of small satellite development. However, the results of current semi-physical simulation system have a lot of non-intuitive. Compare with the actual environment, the simulation environment still has striking disparity. So the shortcomings affect precision of simulation. Based on the virtual display technology, the group semi-physical simulation system has been constructed for attitude control of small satellite due to the combination with xPC real-time environment, the simulation computer, high-precision single-axis air-bearing turntable, reaction wheel, air thrust device, fiber gyroscopes, sensors synchronizer, power subsystem and wireless devices virtual display computer etc. Semi-physical simulation achieved the visual simulation in orbit and tracked new information of virtual environment of space into real-time simulation computer. Simulation results show that the simulation system for real-time attitude and orbit position of small satellite semi-physical simulation has an excellent display effect. At the same time, Real-time transfuse of orbit information provides a more accurate space environment simulation. The simulation system of small satellite attitude control to design and evaluate the more direct and convenient.
Extracting of Micro Doppler Parameter of Helicopter Rotor Based on Time-Frequency Analysis
Authors: Zhang Lei , Huang Guo Qing
Published: October 2011

The micro Doppler effect of the radar echo signal of helicopter rotor is studied, and the formula of helicopter rotor echo is obtained. Then the received echo signal of helicopter rotor simulated is analyzed in time domain, frequency domain and time-frequency domain respectively, the analysis results show that it is a good method to extract micro Doppler of helicopter rotor echo by time-frequency analysis. According to analysis results, obtained a method to determine parity of blades and velocity of helicopter rotor, these methods can be used to identify helicopter.
Volume Concentration and Phase Distribution Measurement of Pulverized Coal in the Pneumatic Conveyor
Authors: Duan Quan Sheng , Zhang Zhen Yang , Zhang Xiao Na , Zhao Qing
Published: October 2011

This paper proposed the design and experimental evaluation of a radiometric instrumentation system which was developed for measuring the volume concentration and phase distribution of pulverized coal in a pneumatic conveying pipeline.The system employed point γ-ray source with 180° plane angle of emergence source collimator, γ-ray detector multi-element independent each other annular arrayed out of the sensor conduct wall,every detector element was standardized singly,in order accommodate the inhomogeneity of the pulverized coal distribution in the pipeline.the instrument system would be able to determine the volume concentrition independently of the flow pattern while obtain the distribution information of pulverized coal in the conveying pipeline cross section. The static experment improved that the solution was correct in principle.
Comparative Study of Friction and Wear Behavior of Diamond-Like Carbon Coating under the Lubrication of PAGs Containing Various Additives
Authors: Wu Hao , Xia Yan Qiu , Feng Xin , Ge Xiang Yu
Published: October 2011

The friction and wear properties of the DLC coatings were evaluated while being lubricated with pure PAG, PAG containing PN and ZDDP using reciprocating ball-on-disk sliding UMT tester, respectively. The morphologies of the worn surfaces of the DLC coatings were observed using a scanning electron microscope (SEM). The results indicated that the DLC coatings exhibited better tribological properties under the lubrication of PAG containing PN or ZDDP than that of pure PAG. In addition, PN and ZDDP as additives show different tribological properties. The former offers better anti-wear ability, the latter offers better friction-reducing properties.
Finite Element Investigation of the Influence of Thermophysical Parameters on Segmented Chip Formation during High Speed Cutting
Authors: Lin You Xi , Yan Cong Ming
Published: October 2011

A 2D fully thermal mechanical coupled finite element model is applied to study the influence of material parameters on serrate chip formation during high speed cutting process. The serrated chip formation during high speed machining was predicted. Of interests are the effects of thermal conductivity, specific heat and density. Results showed significant influence of these thermophysical parameters on the serrated chip phenomena, especially in the case of the density. Increasing thermal conductivity specific heat and density lead to a decreasing degree of segmentation. The influence of the thermal conductivity on the cutting force and the specific heat on maximum temperatures in the shear band is also discussed.
High-Performance Speed Sensorless Direct Torque Control of PMSM
Authors: Xu Yan Ping , Guo Ke , Zhong Yan Ru
Published: October 2011

A high-performance speed sensorless direct torque control (DTC) system of permanent magnet synchronous motor (PMSM) is presented in this paper. The stator flux linkage, speed, rotor position and load torque of PMSM are observed using a fourth-order Extended Kalman Filter (EKF) and a second-order Kalman Filter (KF) and the observed load torque is used for feed-forward compensation of reference torque. Simulation results clearly demonstrate the performance of speed can be improved when load torque is changed and the validity of the proposed control strategy.
The Research of Multipath and Linear Error for Pseudolites Applications
Authors: Wan Xiao Guang , Zhan Xing Qun
Published: October 2011

Pseudolites are ground-based transmitters that send global navigation satellite system like signals, such as GPS, GLONASS, or Galileo. As an independent system for indoor positioning, pseudolites technique can be explored for a wide range of positioning and navigation application where the signal of satellite GNSS can’t be received. However, with indoor environment, the positioning method of pseudolite navigation system is not entirely same as GNSS, and there are some challenging issues in research and system design. In this paper, a signal difference carrier phase measurement system with pseudolites is design. Furthermore, two major problems are studied that they are multipath error and linear errors.
(t,k,n) Multi-Blind Proxy Signature Scheme on Elliptic Curve
Authors: Liu Guang Liang , Xie Sheng Xian , Fu Wei
Published: October 2011

On the elliptic curve cryptosystem proposed a new multi-proxy signature scheme - (t, k, n) threshold blind proxy signature scheme.In new program blind proxy signature and (t,k,n) threshold secret sharing scheme will be combined, and will not over-concentration of the rights of the blind proxy signer .Computation of the program is small, security is high, the achieve efficiency and the utility is better .can prevent a malicious user's forgery attack and have the security properties of proxy signature.
A New Phase Noise and Channel Estimate Method in CO-OFDM System
Authors: Chen Qian , Cao Ye , Guo Min Jie , Tong Zheng Rong
Published: October 2011

High phase noise and low phase noise have been consideration in CO-OFDM systems, respectively. The hybrid mitigation algorithm is optimized to approach to high phase noise and low phase noise environment, and a hybrid half-blind phase noise compensation algorithm is proposed, which could be suitable to shifty DFB laser linewidth. 4QAM and 16QAM are used to modulate binary signal. The new proposed phase noise compensation algorithm is considered a mitigation method which has the ability of half-blind self-adaptation. It deduces the coefficient matrix in high and low phase noise compensation matrix and could improve performance under high or low modulation index situation.
Implementation of DES Encryption Algorithm Based on FPGA and Performance Analysis
Authors: Lian Ji Hong , Chen Kai
Published: October 2011

This paper introduced the principle of DES encryption algorithm, designed and realized the DES encryption algorithm with verilog hardware description language, realized module simulation with Quartus II. Two comprehensive considerations from the resources and performance, one pipeline stage control is set in round function to improve the processing speed, Synchronous pipeline architecture of data XOR key round function and Key transformation function is realized on hardware to reducing logic complexity of the adjacent pipeline, round function multiplexing is realized by setting the round counter and controlling the data selector.
An Improved Timing Recovery Algorithm Design
Authors: Feng Jia Mei , Yao Yuan Cheng , Qin Ming Wei
Published: October 2011

Timing-jitter is an important index of timing recovery algorithm. This paper describes impact-factors of timing-jitter in an AWGN channel and discovers that input noise have great influence on it, proposed an improved timing recovery method for adding a loop gain to reduce it. Simulations demonstrate that a timing recovery with loop gain can have performance superior to that of without it, and got the conclusion that add loop gain at the range of 0.1 to 0.3 both timing jitter and timing recovery points can reach minimum values. Better yet, when choose a loop gain at 0.1, timing jitter decrease from ±0.2 to ±0.08, and system’s error rates also have obverse decrease.
A Hardware Accelerate Simulator for Network Processor Based on FPGA
Authors: Di Zhi Xiong , Li Kang , Pang Jie , Shi Jiang Yi , Ma Pei Jun , Hao Yue
Published: October 2011

With the dramatically increase of the scale of the Network Processor, traditionally verification method can't satisfied the requirement of market due to the limitation of the simulate speed. For solving the verification problems, a novel hardware accelerate simulator for Network Processor based on FPGA is proposed. This simulator improves the simulate speed remarkably. Furthermore, the probed signals of the Network Processor can be dumped into wave file real-timely.
An Ant Colony Optimization for the Composite SaaS Placement Problem in the Cloud
Authors: Ni Zhi Wei , Pan Xue Feng , Wu Zhang Jun
Published: October 2011

Cloud computing has become a main medium for Software as a Service (SaaS) hosting as it can provide the scalability a SaaS requires. In the composite SaaS placement process， it should consider the factors about the size of the cloud network, SaaS interactions between its components and SaaS interactions with its data components. A previous research has tackled this problem using a genetic algorithm (GA) approach. This paper proposes an ant colony optimization (ACO) approach. The ACO for the SaaS placement problem has been implemented and evaluated.
Image Compression and Transmission System for Digital Down-Hole Television
Authors: Su Juan , Yan Zheng Guo
Published: October 2011

Image compression method and long distance transmission technology are technical difficulties in researching digital down-hole television. A down-hole image compression and transmission system is designed. Data are transmitted with quad logging cables and the data transfer rate is 100Kbps; hardware image compression method based on the wavelets transform is adopted and image data are treated with the wavelets transform, quantization and coding. By controlling color selection, quantizes coefficients, quality box parameters, background contrast and field rate to achieve dynamic control of compression rate and obtain high compression ratio simultaneously. Two compression ratio control methods are presented according to data transfer rate and typical borehole image and steady image can be observed in 3000m deep mine.
The Study on the Modeling Method of Complex R and D System
Authors: Shang Hang Biao , Tian Guo Shuang
Published: October 2011

The R and D capability is the critical factor of enterprise survival and development. But the success rate of R and D is getting lower and lower with the update of product is becoming more and more rapidly. This paper establishes a model of Multi-agent system based on the modeling technologies and methods of Multi-agent. The research findings can help enterprises use and allocation of resources and reduce the investment of the actual R and D, then improve the success rate of R&D process.
Topology Optimization of Compliant Mechanisms Using Level Set Method without Re-Initialization
Authors: Zhu Ben Liang , Zhang Xian Min
Published: October 2011

In this paper, a new level set method for topology optimization of compliant mechanisms is presented. A new formulation is developed and built in the traditional level set method to force the level set function to be close to a signed distance function during the optimal process. The validity of the method is illustrated by topology optimization of a widely studied compliant mechanism.
The Design of Expert PID Parameter Optimized by Genetic Algorithm
Authors: Cheng Jia Tang , Xiong Wei , Ai Li
Published: October 2011

Aiming at the problems Expert PID parameter tuning for time-consuming, and the results are not necessarily the best. In this paper, genetic algorithm is introduced to the parameter optimization, finally get a set of optimal PID parameter values. In comparison with simulated experiments, the results show that the performance of the Designed to optimize the performance of optimization expert PID controller is better than conventional controller, can achieve good dynamic performance.
Fatigue Crack Length Real Time Measurement Method Based on Camera Automatically Tracking and Positioning
Authors: Gao Hong Li , Shen Shan Shan , Yun Yan
Published: October 2011

Fatigue crack propagation test is a very important testing way to study the metallic engineering material fatigue fracture characteristics by on-line measuring crack length under the cyclically varying loads. Crack length has been obtained through crack image capture, image processing and image analysis. In order to improve the crack measurement precision when the fatigue crack keeps growing, a new crack length real time measurement method based on the image processing and camera automatically tracking techniques was presented in this paper. This method includes the crack image processing algorithms and camera tracking and positioning movement control. The crack length measurement errors based on the camera tracking and fixed camera are respectively 0.076mm and 0.148mm.The experiment results show the proposed method has greatly improved the crack length measuring precision with the ordinary optical device.
A Novel Gaussian Particle PHD Filter for Multi-Target Tracking
Authors: Huang Zeng Jian , Liu Gui Xi , Chang Peng Ju
Published: October 2011

The Gaussian particle probability hypothesis density filter (GPPHDF) needs conventional Monte-Carlo (MC) sampling in predict step and update step, which decreases the accuracy and real-time performance of the algorithm. This paper employs Quasi-Monte-Carlo (QMC) sampling to replace MC sampling, and QMC integration method is introduced to approximating the prediction and update distributions of target states. Hence a tracking algorithm based on the QMC method is proposed, which reduces the computational complexity and improves the accuracy and stability of the tracking algorithm.
One Optimum Design Method of Dry-Type Air-Cored Reactors
Authors: Zheng Li Ping , Yu Hai , Dou Ju Feng
Published: October 2011

The process of designing a dry-type air-cored reactor is one repeated way of computing and regulating the correlated parameters, and it is very complex and time-consuming. Therefore, Genetic Algorithm is introduced in this paper, for the purpose of reducing error between total inductive potential of coils and the terminal voltage, we set up the optimization model of an air-cored reactor, and the Improved Genetic Algorithm is adopted to make an optimal design for the air-cored reactor. The results show that designed accuracy can be greatly improved.
The Experimental Research of Magnetic Powder Brake Loading Characteristic in Rotary System
Authors: Liu Jing Liang , Wang Shou Kun , Wang Jun Zheng
Published: October 2011

In order to obtain the loading characteristics of magnetic particle brake (MPB) in rotary system, the servo-motor controlling and testing experimental platform is used to research MPB loading characteristics. The key step is designing different experiments that include static loading experiment, step loading experiment, and tracking loading experiment. Based on the static experiment data, the MPB static property presents hysteresis which is described appropriately in the way of piecewise fitting. The response time in step experiment is longer in upward section than in downward section and it has no relation with the speed of MPB by lucubrating step experiment data. Phase difference is relevant to input current excitation frequency after analyzing tracking experiment data. The loading characteristic of MPB is closely relation to the MPB velocity which is proposed in rotary loading system. When the input current doesn’t change, the output torque increases along with the rotary speed increasing. Also, this paper provides reference materials for improving the loading precision, mathematics modeling, and hysteresis compensation.
A 3.1~10.6 Ghz Ultra-Wideband SiGe Low Noise Amplifier with Current-Reused Technique
Authors: Li Kang , Liu Chi , Yang Xiao Feng , Feng Qian , Zhu Chao Xian , Huang Guo Dong
Published: October 2011

A 3.1 ~ 10.6 GHz Ultra-Wideband SiGe Low Noise Amplifier (LNA) is proposed. This low noise amplifier utilizes a current-reused technique to increase the gain and extend the bandwidth. We have a detailed analysis for the input matching, noise figure, gain and other features. The LNA was designed with the TSMC 0.35µm bipolar silicon-germanium (SiGe) processes. Simulation results show that the input reflection coefficient is less than-9dB, the output reflection coefficient is less than-10dB, the maximum power gain of 17 dB and the minimum noise factor (NF) of 2.35dB. The total power consumption is 6.2 mW with 2.5V power supply.
Defected Microstrip for Dual-Mode Bandpass Filter Applications
Authors: Wang Yun Xiu
Published: October 2011

A novel dual-mode bandpass filter using defected microstrip structure with distributed capacitance loading inside the free area of a defected microstrip dual-mode loop resonator is proposed in this paper. The filter has the advantages of compact size together with sharp rejection of out-bands and a wide stop-band. The measured results show that better than 20dB rejection levels in the stop-band up to 4.25 GHz have been obtained. It has been validated by simulation and experiment. The simulated results are compared with measured data and a good agreement is achieved.
Quantum Effect in the Mesoscopic Open Electron Resonator
Authors: Yan Zhan Yuan , Liu Zhi Cheng , Zhao Pan
Published: October 2011

In the framework of regularization process for quantization, the mesoscopic openelectronresonator is quantized using Feynman’s path integral method. With a Gaussian type propagator, the energy spectrum and wave functions are calculated. As an application of the results, the quantum fluctuations and uncertainty relation are discussed. The detailed formulation of energy spectrum and wave functions would be benefit to the further research work of the system.
Research on State-Space Mapping Algorithm from the Vehicle Unsteady Constraint Test System to the Independent Vehicle System
Authors: Wang Guo Ye , Zhang Juan Li
Published: October 2011

Project the vehicle unsteady constraint test system for testing vehicle ESP control performances safely and efficiently, set up the test system dynamics model. Based on the Matlab/Simulink establish the dynamics simulation system of the vehicle unsteady constraint test system for the Chery A3 car. Using the simulation model, we respectively simulate the stability control performances of the test system and the independent vehicle system on steady-state conditions of under steering and over steering. Research and verify the state-space mapping algorithm from the test system to the independent vehicle system using the artificial neural network. The study results indicate that the state-space mapping algorithm from the vehicle unsteady constraint test system to the independent vehicle system using the artificial neural network has ideal mapping performance, it will provide a theoretical basis and technical support for researching the vehicle ESP control performances based on the vehicle unsteady constraint test system.
Design and Implementation of a Wideband C-Band LNA
Authors: Zhang Jian Ye , Tian Ling , Hong Wei , Liu Jia Qi
Published: October 2011

This paper presents the design and implementation of a C-band 6-8 GHz wideband low noise amplifier (LNA). The design is based on balanced structure. The compensated matching networks are designed to obtain gain flatness, two Wilkinson couplers are used to obtain good input and output VSWR, a section of microstrip line is introduced between the source and ground to improve the stability. The measured gain is 12±0.5 dB and noise figure is less than 1.5 dB, the input and output VSWR are better than 1.7. The LNA with broad bandwidth, flat gain, low noise figure and high stability can be used in wideband RF receivers.
Zero Error Analysis and Compensation of No-Beat Time Division Multiplier
Authors: Zhu Wu , Guan Shui Xiu
Published: October 2011

Time division multiplier was widely used in high-precision industrial frequency AC power measurements.The poor stability of zero point was caused by the switch leakage and amplifier offset voltage. Based on the experimental study of the time division multiplier circuit designed in the article, the mathematical model of zero point compensation was established, and then the appropriate calibration method was proposed. Considered the amplifier offset voltage, the error model of the time division multiplier was analyzed and the error expression was obtained. These can provide theoretical guidance for choosing amplifiers of the no-beat time division multiplier.
Structure Optimization of Piezoelectric Micromachined Modal Gyroscope
Authors: Hu Xiao Jun , Wu Xiao Sheng , Wang Zheng , Chen Wen Yuan , Zhang Wei Ping
Published: October 2011

This paper reports a novel kind of solid micro-gyroscope, which is called piezoelectric micromachined modal gyroscope (PMMG). PMMG has large stiffness and robust resistance to shake and strike because there is no evident mass-spring component in its structure. This work focused on quantitative optimization of the gyroscope, which is still blank for such gyroscope. A set of quantitative indicators were developed to optimize the operation mode and corresponding device size was obtained. By FEM, the harmonic analysis was conducted to find the way to efficiently actuate the operation mode needed. At last, the Coriolis analysis was conducted to show the relation between angular velocity and differential output voltage by the Coriolis force under working condition.