bluuebunny/crossref_metadata_2025 huggingface dataset:
P-Type ECRL Circuits for Gate-Leakage Reduction in Nanometer CMOS Processes with Gate Oxide Materials
Authors: Zhang Wei Qiang , Zhang Yu , Hu Jian Ping
Published: September 2010

With the decrease of the power supply voltage, the thickness of the gate oxide has been also scaled down in CMOS technologies using gate oxide materials. The leakage dissipation through the gate oxide is becoming an important component of power consumption in currently used nanometer CMOS processes without metal gate structure. Base on the fact that PMOS transistors have an order of magnitude smaller gate leakage than NMOS ones, this paper propose a P-type efficient charge recovery logic (P-ECRL) to reduce leakage dissipations in nanometer CMOS processes with gate oxide materials. For an example, a J-K flip-flop and a mode-10 counter using four-phase P-ECRL circuits are verified. All circuits are simulated using 90nm and 45nm CMOS processes with gate oxide materials. The proposed P-ECRL circuits show significant improvement in terms of power consumption over the traditional N-type ECRL counterparts.
Using Orthogonal Design in Optimizing Parameters for Bubble Electrospinning of Polyvinyl Alcohol (PVA) Nanofibers
Authors: Dong Liang , Shou Wan , Liu Yong , Wang Rui , Chen Ru Dong
Published: September 2010

The present work was aimed at studying the effects of process parameters on morphologies of Polyvinyl alcohol (PVA) nanofibers in a novel electrospinning technique, bubble electrospinning. The process was optimized by constructing L 9(34) orthogonal experimental array design. Three factors were investigated and nine tests were run under lower, medium and higher levels of these factors. The results showed that PVA solution concentration plays an important role in affecting the morphologies of PVA nanofibers in bubble electrospinning process. With the increase of the concentration of PVA solution, the morphologies of fibers were changed from beaded fibers to uniform cylinder fibers and the average nanofiber diameter also increased. The optimization process was 12w% for PVA solution, 30kV for applied voltage and 10cm for spinning distance.
Analyzing of Functionally Graded Materials by Discrete Element Method
Authors: Zhou Feng Xi , Li Shi Rong , Lai Yuan Ming , Yang Yan
Published: September 2010

Based on discrete element method, the mechanical responses of a functionally graded cantilever beam are studied by using of two kinds of particle with different properties. The variation of material properties along the thickness direction is simulated by the different distribution of constituent particles in space. The method validity was tested, and the influence of material homogenous on deformation and stiffness of cantilever beam under mechanical load were studied make use of numerical examples. Method in this paper will provide a new way for analyzing of functionally graded materials and its optimizing design from micromechanism.
Effects of Mechanical Properties of Kevlar/PTFE Fabric-Reinforced Self-Lubricating Liners on Performance of Self-Lubricating Spherical Plain Bearings
Authors: Yang Yu Lin , Ma Chun Rong , Huang Shi Jun , Jing Li Qin , Pang Hao Tian
Published: September 2010

The effects of the mechanical properties of Kevlar/PTFE fabric-reinforced polymer-based self-lubricating liners on the performance of the self-lubricating spherical plain bearings were investigated to improve the evaluation technology of the performance of the self-lubricating liners and the bearings. The mechanical experiments were carried out to study the mechanical properties of the liners with the use of Instron 5848 microtester. Based on these experimental data, several material models of liners were used to carry out the curve fitting, and the 3-terms Ogden form was chosen as an optimum model for the FEM numerical simulation of bearings with and without liners under the conditions of variable loads. These results show that: the mechanical properties of the liners has an important influence on the performance of the bearings; Owing to the elastic properties of the liners, the contact area is increased, and the contact stress between sliding faces are decreased, which improve the load capacity and service life of the bearings; An optimum elastic property of the liners is existed for the performance of the spherical plain bearings. The present study may provide evidence for the improvement of the evaluation technology of the liners and bearings, the further understanding of the role of the liners in the bearings, and the design of the fabric self-lubricating liners.
Study of the Antilock Braking System with Electric Brake Force Distribution
Authors: Li Ju Wei , Wang Jian
Published: September 2010

Antilock braking system (ABS) is a standard equipment for passenger car, it can prevent automobile wheels from locking-up and improve braking performance. Electronic brake force distribution (EBD) can prevent the rear wheels from locking prior to the front wheels, it can automatically adjust the braking force distribution scale among the wheels. In this paper, a vehicle model and tire model are developed, a sliding mode controller is designed for ABS system and a fuzzy controller is designed for EBD system. Dry asphalt road and wet asphalt road are used to simulate the performance of ABS/EBD system. The simulation results show that the control method can make full use of the respective advantages of ABS and EBD systems.
Robust Passivity Control for Uncertain Time-Delayed Systems
Authors: Li Gui Fang , Sun Yong Cheng , Huang Sheng Guo
Published: September 2010

This paper focuses on the robust passivity synthesis problem for a class of linear time-delayed systems subject to parameter uncertainties. The time delay is assumed to be unknown, and the parameter uncertainties are allowed to appear in all matrices of the model. The aim lies in designing observer-based dynamic controller that render the closed-loop system be strongly robustly stable and strict passive for all admissible uncertainties, independently of time delay. Using a scaling parameterization approach, the problem being considered is transformed into a class of strongly stable and strictly passive control problem for a parameterized system without uncertainties. And then, the controller gain and the observer gain are obtained in terms of a linear matrix inequality. Finally, a numerical example is provided to demonstrate the validity of the proposed approach.
The Integrated Control of Semi-Active Suspension and Electronic Stability Program Based on Fuzzy Logic Method
Authors: Guo Jian Hua , Chu Liang , Zhang Xiao Bing , Zhou Fei Kun
Published: September 2010

In this paper, an integrated system of SAS/ESP is proposed to improve vehicle handling performance and stability. The 15DOF vehicle model which describes the dynamics of the integrated system is established. A fuzzy logic control strategy is presented to control the integrated system. The simulation results show that the integrated control system can obviously improve vehicle maneuverability and ride quality much more than the individual control.
Evolutionary Game Analysis for the Greenhouse Gases Emission and Environmental Inspection
Authors: Zhang Liang , Jiao Yong Ji , Li Na
Published: September 2010

People have been or are about to take many measures to reduce greenhouse gases emissions, carbon dioxide focused, which are considered the chief culprit of global climate change. The inspection of carbon emissions is the basis of these measures. The evolutionary game relationship lies in the environmental authorities and carbon emitters, both are bounded rational. The replicated dynamics mechanism is utilized to analyze the repeated game of them. The punishment for the illegal carbon emission, the rewards and punishment to the environmental authorities and the environmental inspection cost have significant impact on the strategy choise. Increasing the punishment for illegal carbon emission, increaseing the punishment for dereliction of duty, reducing the inspection cost by promoting the new technology and adjusting the overlapping management will make the carbon emitters legitimate and the environmental authorities conscientious.
The Performance Analysis on Cooling Capacity of the Air Cooler for a Turbocharged 4-Stroke Marine Diesel Engine
Authors: Huang Jia Liang , Wang Dan , Yang Guo Hao
Published: September 2010

Air cooler system is aimed at increasing the density of pressurized air to reduce the work cycle of the average cylinder temperature and exhaust temperature, to prevent excessive thermal load on components, effectively inhibit the NOx emissions. Daihastu 6PSHdM-26H diesel engine, which is a type of 4-stroke medium-speed turbocharged marine diesel engine, is widely used in ocean-going ships. Considering its working principle and structural properties, this paper describes some roles and running influent factors of air cooler, establishes its physical and mathematical models in order to set up the numerical calculation method, gets the relative parameters of deterioration of cooling capacity in an air-cooler. And then points out that the influence of deteriorated heat transfer in an air-cooler for the effective fuel oil consumption of marine diesel engine is dual , that is, the increasing of air flow resistance and dirt as well as decreasing of cool capacity, the effective fuel oil consumption is rising. On the basis of the numerical calculation of air cooler, these results not only provides some theory support to solve deteriorated of operational performance for heavy-duty 4-stroke marine diesel engine, but also decrease the dependence degree for a marine engineer, then make it possible to scientific manage modern big-scale automatic engine room and improve the reliability of marine propulsion power plant.
Study on Cooperative Navigation Based on Nonlinear Filtering for Multiple UUVs
Authors: Lu Jian , Xu De Mn , Zhang Li Chuan , Zhang Fu Bin
Published: September 2010

Cooperative navigation of multiple Unmanned Underwater Vehicles(multi-UUVs) is an important approach to solve localization problem of UUV formation. This paper expatiates on the popular cooperative navigation modes of Leader-Fellow structure and Moving Long Base Line(MLBL) structure, and provides the motion equations and the measure equation based on hydroacoustic Time-Of-Flight(TOF), and studies on the cooperative navigation methods which make use of two nonlinear filters of EKF and UKF. It is an obvious conclusion that adopting cooperative navigation methods can improve effectively localization accuracy of UUV equipped with low precision navigation sensors.
Selection of Power Train Components and Simulation of Dynamic Performance of Electric Vehicles
Authors: Tu Cheng Jiao , Wei Xue Zhe , Dai Hai Feng
Published: September 2010

Electric vehicles have the ability to drastically reduce petroleum use. As the battery used in EVs appears to be the main technical barriers both from a performance and cost perspective, the main efforts have been focused on how to select appropriate power train system for the better dynamic performance. This paper introduces some methods of parameters design of EV’s main power train components, such as the lithium-ion battery and AC induction motor. Then we build a battery model, a motor model and vehicle simulation models using ADVISOR software. Meanwhile, this paper proposes simulation results of the entire vehicle’s dynamic performance, which shows that the power train components’ parameters designed here basically meet the vehicle’s requirements.
A Two-Stage Model of State Prognosis Based on Vibration Monitoring Information
Authors: Wang Y. , Dong Y.H. , Qiao J.Y. , Ma Li
Published: September 2010

The paper puts forward a two-stage model of state prognosis based upon measured vibration monitoring information to date. First the two-stage operating process of equipment is described. Secondly, the modelling method and process of the two-stage state prognosis model is given. At the same time, the estimation method of unknown parameters in model is also given. Last the model is applied to predict the residual life of a set of rolling element bearings based on their vibration monitoring information.
Investigation on Nonlinear Dynamics Characteristics of Vibration Friction System Based on Vibration Pile Driver
Authors: Teng Yun Nan , Li Xiao Peng , Zeng Qing Hui , Wen Bang Chun
Published: September 2010

As a branch of Utilization of vibration, vibration friction is a type of the most valued applicable technology developed during the later part of the 20th century and still in rapid development now. Since the technology is closely associated with industrial and agricultural production, can create huge social and economical benefits for our society and provide excellent service for human beings, it becomes a necessary mechanism in human production and life. The theory of the vibrating machines has been developed and used widely in this field. In this paper, nonlinear dynamic characteristics of vibration friction system based on vibration pile driver were investigated. According to dynamics theory, the motion equation of vibration friction system was established. For further study of vibration friction mechanism and its application on vibrating machines, numerical simulation of vibration pile-soil system was made. Chaos was found in the process of motion. The conclusion of our research is that vibration can decrease rub and wears between vibrating body and materials and it is very important to prolong the working life of machines and their parts.
Research on Chaos Feature and Forecasting of Air Conditioning Load
Authors: Liu Hui Qing , Feng Wen Hong
Published: September 2010

Evolution law on air conditioning load is affected by many factors which are very difficult to be known and gained, that which results in low precision of simulation and forecast. Based on analysis on chaos characteristic of air conditioning load time series, BP neural networks model based on chaos phase space is proposed to forecast air conditioning load through embedding dimension. Considering influence of dynamical factor of air conditioning load as well as difficulty of calculating number of input cell, the model is provided with strong nonlinear mapping capacity, is applied to simulate and forecast air conditioning load, the outcomes is reasonable and higher precision.
On Approximate Treatment of Nonlinear Dynamical System of an Electrostatically Actuated Micro-Cantilever
Authors: Chen Y.M. , Meng Guang , Liu J.K.
Published: September 2010

This paper analyzed an approximate treatment of the nonlinear dynamical system of an electrostatically actuated micro-cantilever subjected to combined parametric and forcing excitations in MEMS. In this approximation, the nonlinearity is expanded into Taylor series. By retaining a number of terms, a modified system is obtained and then employed to study the real system indirectly. Bifurcations and sub-harmonic responses of the real system and of the modified system are obtained via numerical integrating methods. It was found, modified systems with only several terms cannot simulate multi-periodic and quasi-periodic responses of the real system. However, as long as enough terms are taken into account, the modified systems can give rise up the real responses no matter how complex they are.
Faults Diagnosis for Electro-Hydraulic Servo System Using Support Vector Machine Based on Robust Observer
Authors: Lin Rui Lin , Ming Ting Tao
Published: September 2010

This paper presents a new method of fault diagnosis for electro-hydraulic servo system using support vector machine based on robust observer. Firstly, an electro-hydraulic system is introduced and a linear robust observer is designed for the system. Secondly, inner leakage and outer leakage faults of the system are experimentally simulated. Simulating results show that robust residual is sensitive to leakage faults but can not distinguish inner leakage and outer leakage in rod side. Thirdly, a nonlinear support vector machine was closely studied by regarding waveform and kurtosis index of displacement, residual, and pressure. Finally, educating and testing experiments show that the nonlinear support vector based on robust observer can diagnose all leakage faults of the system successfully.
Multi-Threshold Image Denoising Based on Shearlet Transform
Authors: Zhao Jia , Lü Li , Sun Hui
Published: September 2010

Shearlet is a new effective signal representation tool in many image applications. A novel image denoising scheme based on Shearlet transform is proposed in this paper. The original image is first decomposed using shearlet transform, then the shrink threshold of each decomposed subband adopts the different best threshold, producing the preliminary primary denoised image after reconstruction. Experiments show that the proposed scheme can remove the pseudo-Gibbs artifacts and image noise effectively. Besides, it outperforms the existing schemes in regard of both the peak-signal-to-noise-ratio (PSNR) and the edge preservation ability.
Numerical Simulation and Optimization Design of Foam Core/Carbon Fiber Composite Sandwich Beams
Authors: Li Jun , Xi Ba Ta
Published: September 2010

This note presents the main process of optimization design of foam core/carbon fiber composite sandwich which primarily designed for UAV wing beams. During the actual application, the original design provided excessive structural strength and it has certain capacity to be optimized. So the weight of structure can be reduced under the premise of meet the strength requirement. In order to characterize fully the complex mechanical behavior of such a highly heterogeneous material and find the ultimate strength of this structure, MSC.Patran/Nastran has be applied on analysis of this composite sandwich structure. Base on the result of the numerical simulations, the best combination of composite laminated and the material layer thickness have be determined, and the beams structure of the lightweight has be designed ultimately.
Artificial Neural Network Model for Time-Dependent Vertical Bearing Capacity of Preformed Concrete Pile
Authors: Xia Tian , Wang Wei , Wang Xiao Ni
Published: September 2010

Mechanism of time effect on vertical ultimate bearing capacity (VUBC) of preformed concrete pile is analyzed. The effect strongly depends on seven parameters of pile engineering. Pile length, area of pile section, soil friction angle, soil consolidation coefficient, soil elastic module and time after pile installation and pile type are them. Considering time effect and soil consolidation, artificial neural network model to predict this time-dependent VUBC is established. Input layer includes seven parameters discussed above. Conjugate gradient method is adopted to train the net. Based on calculation of practical piles, results of the model are found to be in good agreement with field tests, and the efficiency of the present model is signalized.
A Forward Secure RFID Privacy Protection Scheme with Two-Way Authentication
Authors: Gan Yong , He Lei , Zhang Tao , Li Na Na
Published: September 2010

RFID has become an important infrastructure technology. However, it does not solve information security problem. An adversary can eavesdrop on the messages exchanged between tag and backend database and track tag’s holder. Many scholars have proposed some lightweight protocols in order to protect user’s privacy and avoid various attacks. In this paper, we analyze some authentication protocols. Especially, we analyze a forward secure RFID privacy protection scheme proposed by Ohkubo et al. Afterwards, we propose an improved protection scheme with two-way authentication. It is lightweight and suitable for low-cost RFID system. Moreover, it not only provides indistinguishability and forward security but also provides two-way authentication.
Robust Design Optimization Based on Improved Ant Colony Algorithm with Application
Authors: Hao Shi Ming , Guo Hui Xin , Dai Juan , Cheng Li Zhi
Published: September 2010

The basic ant colony algorithm is improved by introducing chaos model of Logistic and discrete search in order to improve the global convergence. A program of improved ant colony algorithm has been designed by using Matlab. It can be used for solving optimal design problems with continuous variables, discrete variables or mixed-discrete variables. For an electric circuit, the design problem about the robustness of electric current is discussed and a model of robust optimal design is established. The solution of established model is achieved by using the proposed method and the robustness of the electric circuit has been improved. The example shows that the proposed method is effective in engineering design.
Laboratory Tests Study on the Power Dissipation Characteristics of Conductor Self-Damping and Aeolian Vibration Dampers
Authors: Chen Yuan Kun , Li Li , Ye Kun , Yin Peng
Published: September 2010

In this paper, laboratory tests on conductor aeolian vibration were designed and carried out, through which the power dissipation characteristics of conductor self-damping and wire dampers(bretelles) were investigated. In addition, the theoretical method was established to estimate the power dissipated by wire damper. The results show that conductor tension and vibration frequency have great influences on its self-damping property; furthermore, the results present that the natural frequency of wire damper is related with its length and the length of wire damper has significant impact on its anti-vibration effect. The theoretical method for calculating the power dissipated by wire damper was verified to be reliable by the test results. These conclusions can provide references for the research and anti-vibration design of transmission line engineering.
Software Design and Implement of Test System of a Certain Radar Transmitter Based on the 1553B Bus
Authors: Zhang Yang , Zhang Li , Zhang Hu Cheng , Long Run Song
Published: September 2010

A certain type of radar was equipped in the main fighter jets. It is main equipment which can ensure the completion of the task of the fight in the air. But at present, this type of radar transmitter outside the room does not have special test equipment and the manual testing process is also more complicated. So, to achieve rapid testing of this transmitter for technician and improve the measurement’s accuracy, need a new system. In this new system used bus control technology, virtual instrumentation technology and database technology. Besides these, brought them to combine organically, then we get the system with fault diagnosis, detection intelligently and the test database. In order to achieve test and communication with radar transmitters, the system used the MIL-STD-1553B bus as a control bus, the USB bus as a program-controlled instrument control bus and in LabWindows/CVI 8.5 development environment designed software of the system. After a trial showed that the system reached the requirements of the test specification.
Study of Magnetoelastic Torque Sensor for Cutting Processes Monitoring
Authors: Wen Xi Qin , Li Ji Ming
Published: September 2010

This paper deals with the head-type torque sensor, on the basis of magnetoelastic effect, installed on the main shaft of machine tool for sensing cutting torque in order to monitor cutting process. The tests of two types of sensor are carried out under various cutting conditions. In order to confirm the accuracy of these sensors measuring cutting torque, the torque values obtained by two types of magnetic torque sensor are compared between measuring value of strain gauge and calculating value of cutting force experimental formula. The investigation demonstrates that the on-line monitoring of cutting force can be detected through measuring cutting torque by means of magnetoelastic torque sensor, and the cutting state can be shown by cutting parameters.
Multi-Variable Model Predictive Control of Automatic Variable-Load in Air Separation Unit Production Process
Authors: Wang Jin Hui , Kong Jian Yi , Yang Jin Tang , Li Gong Fa , Li Yao
Published: September 2010

The process of air separation unit has the characteristics of many types of equipment, long flow, and strong relativity and complicates structures. A multi-variable model predictive control strategy to achieve the goal of automatic variable-load for the control limits in the variable-load process of air separation unit was proposed. Regard model predictive controller as the core, the problems of coupling in the various technological parameters were solved. Moreover, the non-linear control request for global variable-loading process was satisfied, and the perfect operation character and rate were ensured. Production characteristics, structure, scheme and application processes for the control strategy were described in detail. The system succeeds in applying to the air separation unit in an iron and steel enterprise, the multi-variable control system shows its effectiveness and efficiency in the automatic variable-loading.
Monitoring of Water Quality Using Remote Sensing Techniques
Authors: Wen Xing Ping , Yang Xiao Feng
Published: September 2010

Remote sensing techniques play increasingly important role over recent decades in both problems of global climate change and frequent deterioration of the status of aquatic ecology. In this paper, Landsat ETM+ imagery was used to monitors water quality in Kunming city, southwest China. Five over 30 square kilometers lakes which are Dianchi, Fuxian, Yangzong, Qilu and Xingyun Lake were extracted and investigated. Comparing spectra of different water quality, it can be conclude the reflectance of band 2 and band 3 change dramaticlly corresponding to different water quality, which are relate to the water pollutant. Therefore, the sum of band 2 and band 3 reflectance used as a water quality index was selected to detect water quality. Firstly, the remote sensing data was atmospheric corrected and the reflectance of band 2 and band 3 was added using band math. Secondly, density slice was applied to the processed sum image using suitable data ranges and colors, and six water quality level was outputed. Finally, the result image was projected and outputed. As shown from result, the water quality of Fuxian and Yangzong lake were the best, and Dianchi and Xingyun lake were the worst, Qilu lake was in the middle. Suitable water pollution controls and provention for Kunming lakes would be needed.
Development of a High-Efficiency CVT
Authors: Hao Jian Jun , Wei Jian Wei , Lv Wei , Cheng Nai Shi
Published: September 2010

Aim to conquer the low efficiency of the current auto-CVT actuated by hydraulic system, a new design was proposed based on the analysis of the energy loss, which used compounded disc spring clamp set and motorized actuation system. Through the special design of the compounded disc spring and the balance spring, the axial thrust was well counterpoised, thus it achieved the result that the actuation system could be droved by low power motor. The test results show that the CVT developed according to the new design can reduce the power consumption obviously and improve the power performance.
A New Method of Quality Control for New Product Development
Authors: Jiang Xing Yu , Sun Xue Yan , Wang Shi Jie , Wang Wan Shan
Published: September 2010

To cope with the challenges of product quality design system applied in new product development (NPD), a new method of quality control for NPD-collaborative quality design mode, which integrates voice of customer, quality function deployment (QFD) and failure modes and effect analysis (FMEA) , and corresponding functional modules and framework were all put forward. This mode dealt mainly with constructing and running collaborative quality design system, integrated several enabling technologies such as the integration of QFD and FMEA, task distribution of quality design, integrated technology of computer-supported-collaborative work (CSCW). On the basis of these, applying Java, JSP and JavaServlet to the system, improve working efficiency and shorten the development cycle so as to respond to the fluctuation of market demands as quick as possible. The quality design of some automobile was introduced as an example to verify that the system developed would efficiently meet the requirements of NPD.
Review of Methods for Battery Life Modeling and Their Applications
Authors: Gu Wei Jun , Sun Ze Chang , Wei Xue Zhe , Dai Hai Feng
Published: September 2010

Battery Management System (BMS) mainly focused on the estimation of State-of-Charge (SOC) previously. However, the single SOC could not reflect the true state of battery. Life prediction and performance state estimation becomes an increasingly important issue in each battery life stage. A practical and accurate battery life model is their basis. Much research work has been done in recent years to improve the accuracy and application range of battery life model. This paper introduces commonly used battery life modeling methods and summarized the characteristics of each model and their common applications, and the emphasis for future study is proposed as well.
Hardware-in-Loop Test Platform for Electric Vehicle Cell Battery Management System
Authors: Wang Qing , Wei Xue Zhe , Dai Hai Feng
Published: September 2010

This article introduces a Hardware-In-Loop test platform for electric vehicle Cell Battery Management System (BMS). At first, system structure of test method is projected to make requests for a battery emulator which is the main work of test platform. Then hardware is designed to simulate the input and output signals of BMS. The model for Lithium-ion battery, hardware driver and relative algorithm are built in Matlab/Simulink. After the model is validated, automatic code generation is performed. The code is downloaded to hardware platform. This platform enables validation of BMS instead of using real batteries.
Dynamic Behavior of the Advanced Actuator
Authors: Zou Chang Ping
Published: September 2010

The advanced actuator is a kind of swaying mechanism specially developed for certain aircraft, having low rotational speed and great torque. Utilizing criterions of mass equivalent and bending stiffness equivalent, this paper firstly applies simplification to the actuator, getting a piece of continuous beam with varying circular sections. According to the mounting condition of actuator, then establishes the finite element dynamic analyzing model, using I-DEAS software, selecting method of synchronous vector iteration, finishes normal modal analyzing. Next, carries Hertzian contact resonance analyses to ball straight-rotary pair, ball spline pair and ball unload pair, calculates contact resonance frequencies. Considering the resistance torque being moving still concludes formulae of quantity of contact resonance frequencies. Lastly, based on load spectra, makes a conclusion that antiresonance behavior of the actuator is well, showing that the design plan is feasible. Experimentation of prototype indicates that the above theoretical analyses are correct.
The VLSI Design of Fingerprint Normalization Algorithm
Authors: Du Shi Min
Published: September 2010

Fingerprint identification is one of the most important biometric technologies, which has drawn a substantial amount of attention recently. Fingerprint enhancement algorithm is an important component of fingerprint identification. Normalization is the first step of enhancement algorithm. In this paper, the VLSI design of normalization algorithm is proposed. This paper performs these following tasks. Firstly, the flow of enhancement algorithm and the basic principle of normalization algorithm is introduced. Then, a scheme of VLSI design of normalization algorithm is proposed and described in detail. Finally, we implement this design with Verilog language and present the simulation result with Modesim9.0. The simulation result shows that the scheme proposed in this paper has improved the fingerprint image quality to a certain extent.
Multi-Criteria Optimal Design of Parallel Manipulators Based on Natural Frequency
Authors: Lv Bang Jun , Zhu S.J. , Xing J.F.
Published: September 2010

The Stewart manipulator has characteristics of low natural frequency, high cost and large size which make it difficult to obtain optimum performance with high dynamic response. The lowest natural frequency in the total workspace and average of six frequencies at home configuration of Stewart manipulator are introduced as indices to evaluate dynamic stability. Multi-criteria optimal design based on genetic algorithm (GA) was presented synthetically considering the workspace requirement, lowest natural frequency, average frequency and global dimensionally homogeneous Jacobian matrix condition number. An optimal result was obtained through standard GA using penalty function and the Pareto-optimal set was also obtained through parallel selection method.
A Structure Analysis Method for Machine Tools Based on Assembly Relationship
Authors: Hu Dong Fang , Li Yan , Shang Jian Dong
Published: September 2010

Considering the nonlinear relationship of the joint surface between parts in machine tool assembly, a finite element analysis method based on assembly relationship is proposed. By this method, a finite element model is set up. Based on the analysis of experimental data, the result is close to the actual working conditions, which proves that this analysis method based on the machine tool assemble relationship is feasible and reliable
A Projection Pursuit Evaluating Model of Project Investment Decision-Making
Authors: Zhang Xian Qi , Feng Wen Hong , Li Nan Nan
Published: September 2010

The restraints and conflicts between indexes in the project decision-making often influence rationality of outcomes. Through applying PPE model to project decision, the author makes use of RAGA to optimize the projection direction, turns multi-dimension data into low dimension space, so the value of projection function can be calculated by way of seeking the optimal projection direction, thereby, according to the value, project decision can be processed. The outcome from concrete application indicates that it is very reasonable, has avoided the problem of calculating coefficient of weight subjectively, and it provides we with a new method and thought to project decision.
The Risk Assessment Research on Real Estate Projects in View of Fuzzy-Synthetical Evaluation
Authors: Zheng Xiao , Xu Shui Tai
Published: September 2010

It analyses different kinds of risk factors of real estate investment, and establishes a suit of scientific index system about the risk assessment of real estate investment. And this paper not only establishes the risk assessment model of real estate projects in view of fuzzy-synthetical evaluation, but also uses this model to make a risk assessment of Ganzhou Tianyue real estate project, showing the feasibility of the model by examples.
A Single Phase High Power Factor Rectifier with UCC28019
Authors: Zhang Hou Sheng
Published: September 2010

Power factor correction (PFC) is an effective method to reduce harmonic current in power grid. A novel boost high power factor rectifier with UCC28019 is proposed. The UCC28019 8-pin active Power Factor Correction controller uses the boost topology operating in continuous conduction mode (CCM). It does not need multipliers. The use of the IC will make the PFC circuit design easily and the volume of the rectifier small. The fundamental principle of the proposed rectifier is introduced. Its sections such as current loop and over-current protection, voltage loop and over-voltage protection, and so on, are analyzed and designed respectively in detail. Experimental results of the designed 350W prototype prove that the boost high power factor rectifier is rational and reliable, its power factor can reach 0.992, and its application prospect is wide.
Design and Implementation of SOA-Based Professional Title Assessment System
Authors: Kang Xiao Jun
Published: September 2010

In order to provide one-stop service of professional title assessment for the college staff, the business process based on SOA integrating personal qualification, automatic generation of vocational assessment materials, quantification of evaluation index, online expert assessment and vocational assessment information release is presented. Especially, the business process reengineering and business service lay-out is designed, heterogeneous distributed data sharing and exchange of the problem is solved, and the original isolation of the information system is integrated as a whole. The professional title assessment system implemented in China Three Gorges University digital campus is setup, which increased the objectivity, scientific and transparency of professional title assessment and improved the working efficiency.
Multi-Objective Optimization Algorithm Design and Implementation of Mobile Base Station Site Selection
Authors: Wang Min , Tang Jun
Published: September 2010

The number of base station location impact the network quality of service. A new method is proposed based on immune genetic algorithm for site selection. The mathematical model of multi-objective optimization problem for base station selection and the realization of the process were given. The use of antibody concentration selection ensures the diversity of the antibody and avoiding the premature convergence, and the use of memory cells to store Pareto optimal solution of each generation. A exclusion algorithm of neighboring memory cells on the updating and deleting to ensure that the Pareto optimal solution set of the distribution. The experiments results show that the algorithm can effectively find a number of possible base station and provide a solution for the practical engineering application.
Keyhole Modeling during Laser Deep Penetration Welding
Authors: Wang Ren Ping , Lei Yong Ping , Shi Yao Wu
Published: September 2010

In order to accurately simulate the process of laser deep penetration welding, a mathematical model to describe laser deep penetration welding was developed by using the heat source derived from the ray-tracing model, and taking account into the effect of keyhole on welding pool. With all the governing equations including continuity, momentum and energy equation, the VOF method is adopted to trace the free surface of the molten pool. Numerical simulation was conducted by FLUENT 6.3 software package. The simulation results show that the formation of keyhole in the weld is caused by recoil pressure.
Improvement on Propagation Modeling of New Intelligent Botnet
Authors: Yang Xiong , Zha Zhi Qin , Zhu Yu Guang
Published: September 2010

In order to illustrate and analyze the different features between two-stage advanced botnet propagation modeling and multi time zones modeling, an improved honeypot-aware advanced botnet propagation model using multi time zones is proposed. The model is based on two-stage reconnaissance process and firstly induced the time zones factor, then the diurnal properties of regional variations in online vulnerable populations in multi-time zones is creatively given. Also the novel impact of recovery rate is concerned by simulation.
Secure Image Management Based on Deluge Protocol in Wireless Sensor Networks
Authors: Xie Man De
Published: September 2010

In present, almost all of inline code dissemination algorithms focus on securing the propagation of code images and overlook the security vulnerabilities in the image management aspects of code dissemination, such as rebooting and erasing code images. In this paper, we first investigate the security issues in remote image management for code dissemination in wireless sensor networks and analyze the advantage and disadvantage of the algorithm proposed by Liu et al which employs three different key chains to design three different schemes. To reduce the computation load of authentication operation, a message cipher puzzle-based image management algorithm is proposed. In this approach, a one-way hash key chain is introduced to authenticate the Reboot and Erase command and a weak authentication mechanism is introduced to protect the version number. The message cipher puzzle-based authentication method is efficient, because it only introduces a few hash function operations and comparisons
Document Clustering Based on Fuzzy Similarity
Authors: Zhou Jing Li , Nie Xue Jun , Qin Lei Hua , Zhu Jian Feng
Published: September 2010

This paper proposes a novel fuzzy similarity measure based on the relationships between terms and categories. A term-category matrix is presented to represent such relationships and each element in the matrix denotes a membership degree that a term belongs to a category, which is computed using term frequency inverse document frequency and fuzzy relationships between documents and categories. Fuzzy similarity takes into account the situation that one document belongs to multiple categories and is computed using fuzzy operators. The experimental results show that the proposed fuzzy similarity surpasses other common similarity measures not only in the reliable derivation of document clustering results, but also in document clustering accuracies.
Study on a New Sine Raster Generating Algorithm for Phase-Based Matching
Authors: Liu Xiao Hui , Jiang Kai Yong , Lin Jun Yi
Published: September 2010

Phase-based Stereo Matching (PSM) is an efficient matching method in binocular stereo vision. It bases on correspondence points which have the same phase-distribution. Sine raster generating algorithm is a basic and important step in PSM study. This paper advances that using defocusing rectify-binary patterns (DRBP) method substituted the focusing-sinusoidal-patterns (FSP) method. It has following advantages: (1) No gamma correction is required; (2) The object illuminance measurement is not desired; (3) The influence of noise is minified. There are same phases distribution in correspond points of the pair matching lines by experiment analysis. The feasibility of using DRBP to generate sine raster in PSM is demonstrated.
Bioinformatics Analysis of Gibberella moniliformis Phosphoenolpyruvate Carboxykinase Gene
Authors: Li He , Zhou Guo Ying , Zhang Huai Yun , Li Lin , Liu Jun Ang
Published: September 2010

Gibberella moniliformis is a common disease in C. oleifera, and always results in significant economic losses. Phosphoenolpyruvate carboxykinase is a critical gluconeogenic enzyme and catalyzes the first committed step in the diversion of tricarboxylic acid cycle intermediates toward gluconeogenesis. According to the relative conservation of homologous gene, a bioinformatics strategy was applied to clone phosphoenolpyruvate carboxykinase gene of Gibberella moniliformis by blasting search of EST database with homologous gene cDNA of Neurospora crassa and identified. Some characters of the PEPCK that can encode amino acid were analyzed and predicted by the tools of bioinformatics in the following aspects, including the composition of amino acid sequences, physical and chemical, O-glycosylation site and tertiary structure of protein and function. These results showed that the full-length of PEPCK was 1962 bp and it contained a complete ORF (1671bp), encoded 556 amino acids, which are much conserved in ascomycetes. The calculated molecular weight of PEPCK was 61893.1 Da, theoretical pI of 5.77, 20 a-helix, 37 sheets, 7 glycosylation sites; it was a stable protein with active site ATP -binding site, metal-binding site and substrate-binding site.
Embedded Sensing Design of Gearboxes for Vibration Monitoring
Authors: Chen Z.S. , Yang Yong Min , Ge Z.X. , Li C.
Published: September 2010

Vibration signal analysis is one of the most effective ways for condition monitoring of gearboxes. Traditional way is often to mount additional accelerometer sensors on their cases, which has two unavoidable defects: signal-to-noise ratio is often low due to long signal travel paths and it may be not allowable due to space limitations. While embedded diagnostics (ED) can solve these two problems well by embedding sensors close to fault sources. However, embedded sensing design is a great challenge of ED because embedded sensors must have effects on the structure integrity of a gearbox. So it is necessary to determine how to embed sensors in order to ensure normal functions of a gearbox. In this paper, a finite element-based structure analysis method was proposed to perform embedded sensing design of bearings and gears to determine the optimal modified structure size.
An Efficient Graph-Based Flickr Photo Clustering Algorithm
Authors: Liu Zheng , Yan Hua , Li Zhen
Published: September 2010

Traditional image clustering methods mainly depends on visual features only. Due to the well-known “semantic gap”, visual features can hardly describe the semantics of the images independently. In the case of Web images, apart from visual features, there are rich metadata which could enhance the performance of image clustering, such as time information, GPS coordinate and initial annotations. This paper proposes an efficient Flickr photo clustering algorithm by simultaneous integration information of multiple types which are related to Flickr photos using k-partite graph partitioning. For a personal collection of Flickr, we firstly determine the value of k which means the number of data types we used. Secondly, these heterogeneous metadata are mapped to vertices of a k-partite graph, and relationship between the heterogeneous metadata is represented as edge weight. Finally, Flickr photos could be clustered by partitioning the k-partite graph. Experiments conducted on the photos in Flickr demonstrate the effectiveness of the proposed algorithm.
An Improved Algorithm for Clustering Gene Expression Data Using Minimum Spanning Trees
Authors: Zhao Wei Li , Zhang Zhi Guo
Published: September 2010

Genes are classified in order to understanding the categories of animals and plants, and to getting the knowledge about their connatural structures in the research of the biology. It is important to use clustering methods to recognize and classify modes of gene expression data effectively for studying the relationship between different species of genes. In this paper, an improved algorithm for clustering gene expression data based on Minimum Spanning Tree (MST) is proposed. The improved algorithm mainly uses direct clustering and recursive calculation method to shorten the running time. According to the results of the experiments, Through the use of multiple data sets, the results show that the improved algorithm than the original algorithm is greatly increased in the running time.
Influence of Power Supply Current in Electrical Landfill Leakage Detection Method
Authors: Guan Shao Peng , Wang Yu Ling , Nai Chang Xin , Liu Jing Cai
Published: September 2010

The electrical method is effective on detecting and locating leaks in geomembrane liners for landfills. If a leak exists in the liner, an anomaly in the measured potential is generated in the immediate vicinity of the leak through which electrical current is flowing. But the power supply current above the liner can affect the potential distribution. A current point source model for power supply current was set up in this paper. The potential equation induced by the point source was derived. The analysis of potential expression shows that: 1) the potential generated by the power supply current is proportional to the current size and the medium resistivity; 2) as the medium thickness increases, the potential reduces; 3) to reduce the influence of power supply current, the power supply electrode should be away from the detection area as far as possible.