bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect Factors Analysis of Flow Generation Noise from Muffler Element with Inserted Tube
Authors: Zhao Hai Jun , Wang Hai Xia , Chang Jia Dong , Li Qi , Tian Li Ping
Published: December 2012

Using orthogonal experimental design method structure parameters of work piece for muffler element with inserted tube are determined. Flow noise regeneration of them is measured on the self development test bench. Relationship model on total sound power of flow regeneration noise and structure parameter and flow velocity is established utilizing Multiple linear regression method, model parameters are solved making use of hyper static least square method. Significance test of the model is performed, the law of total sound power level for muffler element flow regeneration noise changing with the parameters is discussed. Result shows that the established models is all highly significant under 0.01 levels, and inserted length of outlet tube and inn-diameter of inlet tube have higher effect on the flow generation noise, and decreasing the inserted length and the inn-diameter are in favor of reducing flow generation noise. But inserted length of inlet tube and expansion ratio have little effect on the flow generation noise.
Study on Impact of Powertrain Mounting Stiffness on Vehicle Vibration Characteristics
Authors: Men Yu Zhuo , Yu Hai Bo , Wang Hua , Xu Liang
Published: December 2012

ADAMS was used to establish the dynamics simulation model of a truck vehicle vibration system, while the engine, drive shaft and tire excitations were added to the model. For nonlinear characteristics of rubber mounting components stiffness and damping, input was conducted by the use of interpolation function SPLINE. Through the comparison of road tests and simulation results, the model reliability was verified and simulation analysis was conducted on this basis. The results show that reasonable selection and matching of powertrain mounting stiffness, mounting position could effectively improve the performance of vehicle vibration system.
Analysis of Local Stress and Vertical Deflection of Down Chord of Inverted Triangle Cargo Boom of Tower Crane
Authors: Li Bin , Song Zhong Liang , Ke Yong Xian , Liu Hong Da
Published: December 2012

Based on the inverted triangle cargo boom of ST80238 tower crane as the research object, the author took its local down chord as calculation model. ANSYS software is applied to impose the constraints and loads on the model, and the stress and deflection are analyzed. The results show that the top flange of the down chord and the web will be influenced by the axial force of the oblique truss, and larger local stress in the joint position and the surrounding of the oblique truss and the down chord are produced, as well as the largest local stress will be produced in the centre of the connective position, and reducing gradually to the surrounding. In the condition of the box section center line of the down chord is constant, moreover the size of the down flange and the web is increased, and the local stress and vertical deflection nearby the joint of the oblique truss and the down chord will be reduced. Though the research, the local instability of down chord of ST80238 tower crane can be prevented,and a direct reference and basis for box beam of down chord can be provided.
Dynamic Simulation and Analysis of a Dual-Link Suspension
Authors: Feng Jin Zhi , Liu Le , Zheng Song Lin , Gao Da Wei , Sun Tao
Published: December 2012

Based on the multi-body dynamics theory, a rigid-flexible coupling dual-link suspension model is established. Belgium road motivate inputs gathered from a proving ground are imposed on both wheels through a suspension-test rig and then a simulation is carried out. Next, the model is verified and refined by the available field test results of rear axle vertical acceleration. At last, based on the validated suspension dynamic model, a comprehensive dynamic load simulation is performed and different kinds of load form of suspension components are analyzed. This research could provide reference for measure point selection of load spectrum acquisition.
The Study on Experimental Modal Analysis of High-Speed Rotational Shaft
Authors: Zhao Jun , Yuan Jian Chang
Published: December 2012

Centering on the chuck shaft vibration problems in high speed operation of the high-speed winder, experimental modal analysis was used to identify the modal frequency and vibration modes of the chuck shaft different cross-section in the constraint, found out the sensitive point of the response signal ,and the excitation point was found by Relationship between the modal frequency and the input excitation frequency, the results show determined dominant frequency components in the response signal can provide a reliable basis for determining the vibration characteristics of the chuck shaft, analysis of distinguishing the output response signal and selecting response signal point.
Dynamic Analysis for New Low-Speed Motor with Interior Pushrod Harmonic Transmission Device
Authors: Yang Xiao Lan , Liu Ji Feng , Zou Jing Chao , Ding Wei
Published: December 2012

To achieve the design goals of transmission with small size, light weight and low cost, the pushrod harmonic mechanism which is consist of harmonic planetary and cam mechanism is proposed, and the speed-down device of low-speed motor is changed from external installed to interior installed. Based on the mechanism principle analysis, derivation of contour equation and kinematics analysis, the centroid movement theorem of the pushrod roller and the mechanism dynamic is analyzed when the sports vice friction was considered and ignored. The total reaction force and the action line are gained. These data can provide evidence for mechanism simulation, efficiency analysis and reliability design.
Design and Implementation of the Integrated Test Platform for the Hydraulic Components
Authors: Liu Zhi Hai , Zeng Qing Liang , Wang Cheng Long , Kang Hong Xi
Published: December 2012

In this paper, a new type of hydraulic test bed is developed which can be used for performance testing of hydraulic valves, hydraulic motor and hydraulic pump. The composition structure diagram of hydraulic system, power supply system, and the signal flow diagram of data acquisition system were designed. The characteristics of the LabWindows/CVI development tools and the usage of Prodave MPI/IE 6 network communication tools were introduced, also the database storage and access technology in LabWindows/CVI environment. It was proved through the practical application that the test bed is reliable and has the merit of higher precision and automation level, and simple operation.
Prediction Model of Control Valve Characteristics
Authors: Xie Yu Dong , Liu Yan Jun , Wang Yong
Published: December 2012

Control valves are generally present whenever fluid flow regulation is required. The control valve reliability is critical to the control quality and safety of a plant. An improved dynamic and static valve behaviour would have a major impact on the process output. In order to assess the dynamic performance of the control valve, a computer model of an electro-hydraulic control valve is developed. And the control valve characteristics are investigated through the use of mathematical simulations of the control valve dynamic performance. The results show that the electro-hydraulic driven control valve, which is developed to regulate the mixed-gas pressure in combined cycle power plant, can meet the challenge of the gas turbine.
Numerical Simulation of Convection Heat Transfer in a Plate Channel with Sintered Copper Porous Ribs
Authors: Lu Xin Wei , Yang De Zhi , Cao Wen Jiong , Zhou Zhao Yao
Published: December 2012

Convection heat transfer in a plate channel periodically fitted with sintered copper porous ribs attached to a copper plate was numerically studied. The local thermal equilibrium model was adopted in the energy equation to evaluate the temperature of fluid and solid. The effect of porosity, Reynolds number and heat flux applied to the copper plate on the heat transfer characteristic of the porous media was investigated respectively. The numerical results show that the heat transfer can be enhanced by increasing Reynolds number, decreasing the porosity and the heat transfer enhancement of the porous media took effect significantly when subjected to high heat flux. Detailed development of the porous media temperature field and the Nusselt number of the wall as a function of Reynolds number for different porosity and heat flux were also presented.
Fluid Field Analysis for Cyclone Separator Used on Grain Cleaning
Authors: Geng Ling Xin , Zhang Li Jian , Shi Qing Xiang
Published: December 2012

Gas velocity in cyclone separator is measured by testing with laser Doppler velocimeter in this paper. The measuring results indicates that tangential velocity, axial velocity, radial velocity of air distribute following some certain rules, reasonable selected structure parameters can improve separating efficiency
A Linear Macro/Micro Platform Design Based on FEM Simulation
Authors: Zhang Lu Fan , Long Zhi Li , Fan Ji Wen , Wang Zi Chu , Yang Jiang Zhao
Published: December 2012

In the microelectronics manufacturing domain, a linear platform plays an important role to achieve high speed, high position resolution and a long stroke. In this paper, a concept of macro/micro platform is presented by combining with a voice coil motor and a piezoelectric stack actuator. This macro/micro system was investigated by mechanical analysis, related property indices and so on. The static and modal characteristics of the macro and micro system were calculated by finite element method, and then some important conclusions were obtained. The displacement and stress distribution of macro and micro system were disclosed. The relevant change trends of displacement and stress under the different load were investigated and the first four natural vibration modes of the macro system were obtained. Finally, a structure model of macro/micro concept was designed and established by above calculation. These results provide a solid theoretical support for its application in the microelectronics manufacturing equipments.
Design of a Type of Cleaning Robot System
Authors: Peng Hao , Huang Zhi Cheng
Published: December 2012

A cleaning robot for household cleaning is designed based on the single chip microcomputer AT89S51. It can complete home environment clean in the case of unattended. With the help of the infrared sensor and the control system, the Cleaning robot can automatically avoid the static and dynamic obstacles in the working environments and clean the ground in the room. Practice has proved that its structure is compact, flexible, easy to implement and control and it can initially complete the obstacle avoidance and cleaning tasks.
Single Inlet Pressure Swirl Nozzle Stationary Wave Pattern and Quality Optimization
Authors: Wu Ji Liang , Zhang De Yuan , Jiang Xing Gang , Lv Jian Lu
Published: December 2012

A kind of single inlet swirl atomizer is set to adjust the inlet location and the length of the outlet for an optimization spray angle and uniformity in this literature.Stationary wave theory is used to describe the results of spray quality.Experimental and theoretical analysis show that using property machining process size, single inlet swirl nozzles can achieve the optimized quality of atomization (spray cone angle of 55 °and more, skewness of spray cone center below 5 ° ).
Characteristics Ansys of Hydraulic Cushion for High-Speed & High-Precision CNC Lathe
Authors: Liu Le Ping , Gao Qun Qun , Deng Guo Hong
Published: December 2012

In order to solve the transmission precision of ball screw of High-speed & high-precision CNC lathe, design a kind of hydraulic cushion which can maintain transmission stiffness of components. Use the axial strain output of hydraulic cushion to ensure pre-stretching force of ball screw is constant to maintain its constant transmission stiffness. Practice has proved that there are good linear characteristics between the axial strain output of hydraulic cushion and the input of oil pressure.
Sensitivity Analysis and Numerical Simulation of the Planar Mechanism Kinematic Accuracy
Authors: Zhang Rui Jun , Jia Qing Xuan , Meng Liu , Qiu Ji Wei
Published: December 2012

A kind of accuracy sensitivity analysis and numerical simulation method about the mechanism kinematic is proposed for the purpose of getting the reliability sensitivity of the planar mechanism. Combining with the reliability sensitivity analysis method and the computer simulation technology, this method is on the basis of the research of the kinematics equations and the mechanism kinematic accuracy model. Taking the kinematic accuracy sensitivity analysis of the planar four-bar mechanism as an example, the results verify the effectiveness and feasibility of the method.
Fuzzy Adaptive Terminal Sliding Mode Control for Attitude of Flapping Wing Micro Aerial Vehicle
Authors: Lu Wen Hua , Hu Sheng Bin , Wei Jian , Cao Da Min
Published: December 2012

A fuzzy adaptive terminal sliding mode control scheme for the attitude of flapping wing micro aerial vehicle is proposed in this paper. Based on the feedback linearization technique, a terminal sliding mode controller is designed. The singularity of the controller can be solved through switching between terminal sliding mode surface and linear sliding mode surface. To reduce the chattering in the control input, a fuzzy controller is designed to adaptively adjust the gain of the terminal sliding mode controller according to the normal of the terminal sliding mode surface. The stability of the control scheme is verified by using Lyapunov theory. Simulation results show that the proposed control scheme is effective.
Novel Compensator for Aircraft Electromechanical Actuator
Authors: Wang Na , Zhou Yuan Jun
Published: December 2012

Electromechanical actuator (EMA) behaves as the constant power load for its closed-loop structure. EMI filters are needed to eliminate the interferance for the network. This paper proposed a novel compensation method for the 270V DC power distribution with EMA to solve the stability problem as well as to reduce the disturbance. The main emphasis is placed on the design of compensator for achieving excellent dynamics characteristics of the EMA system. Simulations for the EMA system with compensator were done to verify the performance. The results indicates that extra compensator with appropriate parameters can improve the power quality.
Research on Magneto-Rheological Torque Servo Devices
Authors: Li Guo Fa , Han Ming Zuo , Shan Cui Yun , Liu Jia , Yang Jun Xiang
Published: December 2012

The dual characteristic of magnetorheological rheology and phase transitions is studied and its rheological principle is also described. By using the ANSYS finite element method, a simulation analysis of the torque transmission model is conducted. By selecting the magnetorheological fluid SG-MRF2035, a magneto-rheological torque servo device prototype (Gap of 1.5mm) is developed. And a performance testing platform is built for the torque output characteristics of prototype. The test results show that the device could provide supple output torque and the torque is continuously adjustable. This paper provides a new way for the wide application of magnetorheological fluids.
Path Recognition Method for Vision Navigation of Tobacco Harvester
Authors: Li Yan , Guo Zhi Xin , Wei Wen Song
Published: December 2012

Tobacco harvesters are used in large-scale reclamation area. The demand for automatic navigation is urgent because of long time and intensive labor. According to the specificity of tobacco fields’ environment, the conventional path recognition method had been improved, which was taking 2G-R-B processing, threshold processing in turn and adopting dilation algorithm in image morphology instead of median blur algorithm. At last, modified Hough transform was used to extract navigation line. Processing results show that the algorithms which can be underlain in vision navigation research of tobacco machinery can meet the demand of vision navigation in tobacco fields and obtain the target navigation path rapidly and reliably.
Error Analysis of a 2-PRS/2-UPS 4-DOF Parallel Platform
Authors: Cai Shan Le , Peng Li Bing , Huang Wen Tao
Published: December 2012

A new type of a 2-PRS/2-UPS 4-DOF parallel platform was introduced. The error model of the parallel worktable was established through the vector method. The effect of structural error, driving error, position error and clearance error of the joint point to the pose error of the moving platform can be analyzed. Error modeling provides theoretical foundation for design and error compensation of the parallel mechanism.
Temperature Uniformity Control in the Low Pressure Process Champer of the IC Equipment
Authors: Huang Hui , Yang Tie Niu , Li Chang Ming , Zhang Qi Li , Huang Zun Di
Published: December 2012

The production of IC equipments requires tight control of temperature uniformity within the substrates during the vacuum deposition process chamber. Though traditional approaches such as PID control methods result in substantial improvements, but they fail in meeting the stringent requirement of less than 1°C variation to guarantee the long-term stability of the temperature. To this end, this paper describes the application of information fusion closed-loop control system.A heater structure was designed and the heating wire was divided into 3 sections. Then a multi-loop temperature coordinated control system model has been developed and the temperature heating process has been divided into five intervals. In order to achieve the desired temperature uniformity of 1°C, information fusion technology was used to predict the parameters of PID controller. Through experiments, the coordinated control system model can attaining the desired uniformity levels.
Research on Control Technology of Hydro-Viscous Winch
Authors: Meng Qing Rui , Wang Jian , Lin Shang Fei
Published: December 2012

The tramcar runs upward and downward frequently and the load varies with practical requirements, the operating conditions of the hydro-viscous winch are very complex, so the ordinary PID controller cannot meet the requirements of the winch. In order to control the speed of the hydro-viscous winch precisely and obtain perfect starting speed, a new fuzzy-PID control system was designed, the starting process of the winch and the speed regulation characteristics were simulated by using MATLAB. The results show that the designed control system can meet the requirements of the winch well. It can not only obtain perfect starting speed, but also adjust the running speed precisely. Research achievements of this work provide theoretical basis for optimal design and practical applications of the hydro-viscous winch.
The Design of the Monitoring System Based on Marine Environment Buoy
Authors: Kuang Xing Hong , Wang Zhi Yu , Yang Ceng , Huo Hai Bo , Wu Yan Xiang
Published: December 2012

The real-time monitor ability will be improved when the Ocean buoy technology is used on the marine environment monitoring. The design of the monitoring system based on marine environment buoy were described in detail in the paper, which including the integrated hardware and the monitoring software. The ocean remote monitoring function was implemented using the developed software system.
Design of Chemical Water Treatment Control System Based on Quantum PLC
Authors: Ye Zhi Yu
Published: December 2012

In this paper, the design and application of Chemical Water Treatment Control System of Power Plant based on Quantum PLC is presented. Analysis of the chemical water treatment process, details of system design, system hardware, the whole control solutions, as well as part of the software control processes are introduced.
Identification and Control Design of Fuzzy Takagi-Sugeno Model for Pressure Process Rig
Authors: Subiantoro Aries , Yusivar F. , Budiardjo B. , Al-Hamid M.I.
Published: December 2012

The design of an intelligent controller based on fuzzy TS model for a pressure process rig is presented. The proposed controller consists of a fuzzy TS model, a feedback fuzzy TS model, and a low pass filter combined in an internal model control structure. The identification of the fuzzy TS model uses fuzzy clustering technique to mimic the nonlinearity characteristic of the process. Instead of least-squares algorithm, the instrumental variable method is used to estimate the consequent parameters of the fuzzy TS model in order to avoid inconsistency problem. The identified model is validated with the performance indicators variance-accounted-for and root mean square. By using the technique of inverse fuzzy model analytically, the feedback fuzzy controller is designed based on the identified fuzzy TS model. The performance of the proposed controller is verified through experiments at various operating points.
The Application of Fuzzy Smith-PID Controller on Geothermal Air Conditioning System
Authors: Li Liang , Ai-Lian Li
Published: December 2012

To resolve t he problem of nonlinear and hysteretic temperature controlling of geothermal air conditioning system, this paper, puts forward a fuzzy Smith- PID control policy which is compared with the conventional Smith algorithm over the stability under different temperature and Robust characteristics.The simulation show that the practicability and validity of the fuzzy Smith- PID controlling algorithm in geothermal air conditioning system.
Stability Analysis of Quantized Feedback Control System
Authors: Luo Dong Song , Hu Xin Ke , Feng Yi Wei
Published: December 2012

This paper studies the feedback control problem of nonlinear systems in strict-feedback form with state quantizers, which are static and bounded by sectors. Through a newly developed and versatile Lyapunov function analyzing approach for networked and quantized control systems (NQCSs). The common aim is to demonstrate that a unified study of quantization and delay effects in an uncertain system is possible by merging the quantized control law. A new delays-independent stability criterion is derived in terms of linear matrix inequality (LMI) which can be easily solved. This paper describes a system for the stability analysis of the uncertain systems subject to quantization and time-delay. Moreover, a sufficient condition for the existence of a guaranteed cost controller for NCSs is also presented by a set of LMIs. Both theoretical analysis and numerical examples show that the results in this paper are generally less conservative than those in the quadratic framework.
Design of a SoC With High-Speed DDC for Software Radio Receiver
Authors: Deng Jun , Liu Lin Tao , Li Yu Jing , Huang Xiao Zong , Huang Xu , Liu Lun Cai
Published: December 2012

This paper presents a novel scheme for software radio receiver application, which integrates a high-speed digital down converter (DDC) block into a SoC (system on chip) based on OR1200 CPU. The proposed design can transform intermediate frequency (IF) signal to baseband signal and realize the real-time baseband signal processing. The simulation results indicate that the design is capable of accepting data at a 200MHz sample rate and the verification results based on Xilinx FPGA show that the SFDR of DDC can reach to 70.59dBFS.The synthesized results on 0.18um CMOS technology reveal that the maximum clock frequency can reach to 116MHz and the total area is 5.662mm2, and the corresponding power consumption is below 150mW. It should have a good potential for wireless communication applications.
Spacial Filter of Weighting Method Based on Spectrum Analyse
Authors: Li Xian Mao , Huang Gao Ming , Xia Dong
Published: December 2012

The selection of a certain scope angle signal in the traditional method is to switch the hard switches in antennas, this paper proposes a method, which based on a weighting method to filter the signal in certain directions, namely spacial filter. With array antennas，the compositive signal can be acquired, by which the phrase and plus (weighting) of each unit antenna’s signal be adjusted and then the signals be added. In different time, signals can be selected in any scope of directions through adjusting each channels by different weighting. The weighting parameters can be obtained through the analysis of spacial signal and spacial spectrum, and then obtains an appropriate weighting window function. Simulation shows that Hamming window’s weighting is the best among the three representative windows functions. It can obtain a low sidelobe (-44dB) and less rising edge and declining edges. And the paper also give a hardware structure.
One Kind of Study of the Even Charge-up Method of Intelligence for Common Storage Battery Group of UPS
Authors: Yu Hai Ning
Published: December 2012

This text introduces one kind of evenly at the same time charge-up method to part to the every piece in storage battery group of uninterrupted power supply(UPS).this charge-up method can guarantee the consistency of capacity and end voltage of every storage battery in the storage battery group, thus improve its working performance and service life greatly.
Design of the Equalizing Charge Circuit Based on Bidirectional Energy Transfer
Authors: Liang Hui Jiang , Zeng Yu , Xu Kang Ping , He Zhi Wei , Gao Ming Yu
Published: December 2012

The batteries in a battery pack may have different internal resistances, and this inconsistency may lead to fast aging of the whole pack. In order to overcome the shortcomings of existing equalizing charge method, a bidirectional energy transfer mechanism based battery equalizing charge schema is given. We detailed analysis the working principle of equalization circuit and equalization work process, and the program analysis and argument by experiments. Experiments show that the method structure is simple, and it can quickly realize the dynamic transfer of energy between the batteries. The battery power charging imbalance can be effectively solved.
A Novel Three-Port Combiner Based on Coaxial Cavity
Authors: Zhang Su Nan , Ye Qiang , Luo Chang Wei
Published: December 2012

In this paper, a novel three-port combiner based on coaxial cavity is presented, which consists of a band-pass filter with a transmission zero and a ultra-wideband band-stop filter, and the combiner is different to the conventional combiner based on microstrip or stripline. The design and simulated results show that the novel combiner has a good performance, which are insert loss more than -0.5dB and return loss less than -20dB between the GSM/DCS/TD band (800-2170MHz) and WLAN band (2400-2500MHz), the isolation in both bands less than -85dB, respectively. In addition, the performances of the novel combiner are demonstrated experimentally, the measured results have good agreement with simulated results.
Application of Kalman Filter in SOC Estimation of Power Lithium-Ion Battery
Authors: Zhao Chen , Chen Xi Kun
Published: December 2012

This paper analyses the application of Kalman Filter (KF) in Power Lithium-ion Battery SOC (State of Charge) estimation algorithm. After the analysis of two popular SOC estimate algorithm based on KF, an improved KF-SOC algorithm is proposed. The main advance of this improved algorithm is the introduction of parameter-rectification. The parameter-rectification which based on analysis of battery electrochemical principle and battery terminal voltage response curve is also achieved by KF. The main algorithm of improved KF-SOC is generated by the combination of KF and Ampere-hour integrated method. Later the simulations proved the new algorithm with high accuracy.
Poly-NiO/Nb:SrTiO3 Based Resistive Switching Device for Nonvolatile Random Access Memory
Authors: Hu Cheng , Zhu Yong Dan
Published: December 2012

The bipolar resistive switching characteristic of Ag/poly-NiO/Nb:SrTiO3/In device has been investigated in this letter. The current-voltage characteristics of the device shows reproducible and pronounced bipolar resistive switching after 2V forming process and the resistive switching ratio RHRS/RLRS can reach 104 at the read voltage -0.5V. Multilevel memories can be realized by changing the max reverse voltages and show well retention characteristic even after several sweeping cycles. The results have been discussed in terms of carrier injection process via defects at the interface of the poly-NiO and Nb:SrTiO3.
A Parallel Space-Time Block Code Based Transmission Scheme
Authors: Hu Feng , Jin Li Biao , Li Jian Zeng
Published: December 2012

We present a new transmit strategy based on modified Alamouti codes for the simple two branch transmit diversity scheme. The OFDM payload cells from the output of the frequency interleaver is done on one transmit antenna, and the encoding is proceeded on another branch. The proposed encoding scheme can significantly simplify the processes of transforming SISO into MIMO in wireless communication systems. The scheme may easily be generalized to two transmit antennas and M receive antennas to provide a diversity order of 2M, its coding gain is similar to Alamouti code. Computer simulations are performed to investigate the performance of the proposed parallel STBC scheme in a multi-input (MI) system.
Inverter Based on Improved Z-Source Structure for Off-Grid Type Wind Power Generation
Authors: Wang Xu Guang , Zhao Zu Yu , Cao Guang Qi
Published: December 2012

For the Complexity of off-grid type wind power generation &supply system and disturb of the load, an inverter based on improved z-source and single-phase &single polarity circuit for off-grid type wind power generation was designed. Results of Compared simulation and experiment indicated that the inverter designed in this paper was effective and reliable when applied to off-grid type wind power generation.
The Light Extraction Efficiency Enhancement in Organic Light-Emitting Diodes with Substrate Modifications
Authors: Wang Chong , Wang Jun , Yuan Kai , Yu Lei
Published: December 2012

The internal quantum efficiency of organic light-emitting diodes (OLEDs) can reach values near to 100%. Due to the difference among the refractive indices of the substrate, anode, organic thin films, and the air, two wave-guiding phenomena arise in the anode/organic layers and substrate of the OLEDs. In this paper, the substrate modifications are developed to simulate the optical luminous field for OLEDs. Monte Carlo method was used to investigate enhancement of the external extraction efficiency, which is related to the total reflection inside the device by changing the structure of the substrate.
Use of the Fuzzy-Based Taguchi Method for Improving the Yield of BGA Packaging
Authors: Hsien Kuang Hung , Huang Shyh Chour
Published: December 2012

This study presents the use of fuzzy-based Taguchi method for improving of the yield of the floating device of the ball grid array (BGA) mold chase in the molding process with multiple performance characteristics. The objective of this study was to obtain the maximal pressure of the floating device, minimal processing volume, and minimal processing projected area. The results indicate that the frequency of replacing the appropriate spacer of the mold chase decreased by 75 %, the tolerance of the substrate increased twofold, the utilization rate of the auto-mold machine increased by 12 %, and the production capacity was upgraded to 1.7 kpcs in one day.
The IP Design for a Customized Mobile SoC
Authors: Liu Xiang Wen , Liu Li Min
Published: December 2012

IP, Intellectual Property, modules are essential and important for SoC applications. SoC, System on a Chip, is a system integrated on a single semiconductor chip. It is a research hot-point in embedded systems. In this paper, the IP design for a customized mobile SoC is discussed. The customized mobile SoC integrates a mobile computing control or monitor system into one chip FPGA, Field Programmable Gate Arrays. The SoC is required smaller in size and more efficient in operation.
An FPGA Based Frame Rate Enhancer for LCD Display in Embedded Systems
Authors: Xu Kang Ping , Huang Ji Ye , Liang Hui Jiang , He Zhi Wei , Gao Ming Yu
Published: December 2012

CPUs in embedded systems sometimes have limited performance for the sake of cost, so there may be impossible for these systems to drive a LCD display with a high frame rate. An FPGA based schema is proposed to increase the frame rate of the LCD display so that the texts etc. can be seen fluently. The frame rate enhancer is composed of three parts, an FPGA for receiving the data to be displayed, an SDRAM for data storage and an LCD controller for display control. The designed frame rate enhancer can be used in an embedded system, which has a large LCD display but a low performance CPU, without any flicker.
Reinforced Techniques Analysis of Goaf-Side Entry at Isolated Island Coal Face Based on FLAC Numerical Simulation
Authors: Zha Wen Hua
Published: December 2012

According to control problems of surrounding rock at isolated island coal face, taking isolated island coal 1251（3）face ventilation tunnel of PanSan mine as engineering background, this paper puts forward three reinforcement schemes based on the idea of turning later recovery to former reinforcement. Simulation has been done on the character of surrounding rock stress and deformation distribution and supporting structure force of three different schemes by FLAC3D. Finally optimal scheme is the third scheme. The application result show that anchor-net-cable support combined with anchor grouting support has got a good effect. The large deformation of surrounding rock is controlled efficiently and tunnel surrounding rock stable is guaranteed. The study provides a basis for goaf-side entry surrounding rock control under similar conditions.
Adaptive Reconstruction Based on Romp Algorithm
Authors: Xu Xiao Hui , Chen Dong Fang
Published: December 2012

Romp algorithm can reconstruct the signal fast and accurate as long as the signal satisfy Restricted Isometry Property. However, the number of iterations will affect the quality of the image reconstruction directly while the sparsity of the signal is unknown. A new solution will be put forward in this paper which can get the reasonable iteration times of the ROMP algorithm base on some knowledge of each iteration process, Experiments show that this solution can get good quality reconstruction for the image of different features.
A Hybrid Method to Search the Optimal Hamiltonian Circuit
Authors: Wang Yong , He Wei , Tian De
Published: December 2012

The objective of the well-known travelling salesman problem (TSP) is to search the optimal Hamiltonian circuit (OHC) in a tourist map. Finding the OHC becomes hard once the number of the cities and routes in the tourist map are large. The four vertices and three lines inequality was introduced as the constraints of the local optimal Hamiltonian paths (LOHPs) included in the OHC. The chaotic depth-priority algorithm was designed by adding the computation process with the chaotic operator to verify the rationality of the LOHPs generated with the depth-priority algorithm under the inequality constraints. A lot of non-LOHPs are abandoned in the search process and the search space of the OHC is reduced greatly. The method was verified with an example and it can be applied to the network optimization, path planning, task scheduling, assembly sequence planning etc.
Morphological Reconstruction Based Segmentation of Lung Fields on Digital Radiographs
Authors: Zhu Bi Yun , Chen Hui
Published: December 2012

Objective To segment lung fields on digital chest radiographs automatically. Methods A morphological reconstruction filter was first applied to the original image to eliminate the local grey level extremes. Then, the Otsu-threshold method was used to segment the whole image into several connected regions, contours of which were then extracted by using a connected components labelling technique. Finally, a morphological closing operator was employed to smooth any small gaps or burrs of the lung field contours. Results Lung fields were segmented for 40 digital chest radiographs, resulting in an accurate segmentation and extraction of their lung fields for most images. Conclusion Integrating a series of algorithms, including morphological reconstruction filtering, Otsu-threshold segmentation, connected components labelling, and morphological operations for smoothing the outlines can effectively segment the lung fields on digital radiographs.
Detection for Corn/Weed Images Using Moment Invariants by BPNN Classifier
Authors: Wu Lan Lan , Wu Jie , Wen You Xian , Peng Hui , Zhu Zhi Hui
Published: December 2012

This study was conducted to discriminate the weed from the corn in a field combined neural network classifier with image processing technology. The corn and weed images were scanned using a colour imaging system. In the first step, an approximate location of the object of interest was determined by minimum enclosing rectangle, in which image processing was done to obtain the binary image. In the second step, the seven invariant moments were extracted from binary images and used as input to the back propagation neural network (BPNN) classifier. The training set was used to construct shape model representing the objects. The detection accuracy was enhanced by adjusting the number of neurons in the network. Experimental results showed that the BPNN classifier achieved overall detection accuracy of 94.52% with 7-28-1.
An Information Fusion Algorithm Based on Dopplerlet-Hough Transformation
Authors: Deng Ming Hui , Zeng Qing Shuang , Zhang Lan Ying
Published: December 2012

In this paper, a robust image watermarking method with S-Hough transformation is proposed which is robust against geometric distortion. This watermarking is detected by a linear frequency change. The chirp signals are used as watermarks and this type of signals is resistant to all stationary filtering methods and exhibits geometrical symmetry. In the two-dimensional Radon-Wigner transformation domain, the chirp signals used as watermarks change only its position in space/spatial-frequency distribution, after applying linear geometrical attack. But the two-dimensional Radon-Wigner transformation needs too much difficult computing. We propose a modified Hough transformation to provide improved energy concentration of the Dopplerlet transform. The proposed scheme can resolve the time-frequency localization in a better way than the standard Dopplerlet transformation. The watermark is embedded in the 1D improved Dopplerlet transformation domains. The watermark thus generated is invisible and performs well in test and is robust to geometrical attacks. Compared with other watermarking algorithms, this algorithm is more robust, especially against geometric distortion, while having excellent frequency properties.
Study of Adaptive Chaos Embedded Particle Swarm Optimization Algorithm
Authors: Hua Rong , Chen Dan Jiang , Ye Yin Zhong
Published: December 2012

Chaos particle swarm optimization (CPSO) can not guarantee the population multiplicity and the optimized ergodicity, because its algorithm parameters are still random numbers in form. This paper proposes a new adaptive chaos embedded particle swarm optimization (ACEPSO) algorithm that uses chaotic maps to substitute random numbers of the classical PSO algorithm so as to make use of the properties of stochastic and ergodicity in chaotic search and introduces an adaptive inertia weight factor for each particle to adjust its inertia weight factor adaptively in response to its fitness, which can overcome the drawbacks of CPSO algorithm that is easily trapped in local optima. The experiments with complex and Multi-dimensional functions demonstrate that ACEPSO outperforms the original CPSO in the global searching ability and convergence rate.
Convergence of a Class of Nonorthogonal Wavelet
Authors: Zhao Shu Gai
Published: December 2012

Convergence of a class of nonorthogonal wavelet is researched. Starting from a Riesz basis which is generated by a scale function, a class of nonorthogonal wavelet expansions are constructed. Remainders of the wavelet expansions are analyzed and estimated. Then convergence and convergence rate of the wavelet expansions in norm are obtained.
Improved Vision Based Driving Space Analysis by Condensation of Image Data
Authors: Mao Yan Fen , Wiedmann Hans , Chen Ming
Published: December 2012

Sophisticated ADAS (Advanced Driver Assistance Systems) use vision based methods for detection and keeping track of ahead driving cars. With thus acquired data it is possible to implement e.g. following up functions to automatically keep equal distance to ahead driving vehicles or avoid collisions with obstacles ahead. Known vision based methods for detection and tracking of vehicles use its underneath shadow on the road. The main drawbacks of those methods are the detection and identification of a shadow belonging to a vehicle is neither reliable nor robust, and the thereto required processing of the camera images is very expensive concerning processing time. To improve reliability and detectability we propose here to use an approach which is different from the known methods a nonparametric one; to improve processing speed we propose to apply diversity-sampling to condense the image data before processing it.
Ranking Algorithms for Keyword Search over Relational Databases
Authors: Wang Chao , Ding Jie , Hu Bin
Published: December 2012

Developing effective ranking algorithms for keyword search over relational databases is a hot study topic. Ranking algorithm largely determines the performance of a keyword search system. Good ranking algorithms not only provide user with the most relevant query results but also provide fast response time. A number of existing ranking algorithms were classified and compared. Several representational algorithms were summarized and analysed in detail. The principles, advantages and disadvantages of these algorithms were discussed. Finally, prospect for future work, especially the intelligent trends, in ranking were discussed.
Analysis on A 1-out-n Security Protocol Based on Threshold Idea
Authors: Yu Li , Ye Jun Yao
Published: December 2012

In a 1-out-n oblivious transfer model, the sender sends n messages to the receiver. But the receiver can only get 1 message from the n messages, and the sender does not know which message the receiver has gotten. In this paper, we proposed a multiple-use 1-out-n oblivious transfer protocol based on threshold idea. It is more efficient than Naor-Pinkas protocol[1] and Tzeng protocol[2].
On Visualization of Journals Reference Network Based on Force-Directed Layout Algorithms
Authors: Du Xiu Ying
Published: December 2012

Visualization of a journal network is to show the topology of journals reference in a graphic way so as to observe their interaction and importance. A reference network was drawn from the force-directed algorithm, and then compared to the degree centrality and betweenness centrality of the network, and analyzed with their compound influencing factor and core index by Pearson correlation coefficients at last. The results show that the force-directed layout algorithm can effectively reflect the referential status and relations of the library and information (LI) journals, and the importance of a journal can be determined from the layout in a visual and direct way.
The Design of the Sensor Node of IOT Based on SIM20
Authors: Kuang Xing Hong , Yao Zhe Yi , Huo Hai Bo , Li Jun Jun , Wu Yan Xiang
Published: December 2012

The sensor node is important component part of the Internet Of Things. The sensor node circuit based on SIM20 module was implemented in the paper. The design of the wireless RF circuit and the energy management circuit were described in detail. The reliable link between the sensors and the gate are achieved by the developed product.
The Research and Implementation of Geospatial Data Management Based on ArcGIS Service
Authors: Zheng Feng , Lu Han Rong , An Yan , Guo Le Jiang
Published: December 2012

The main objective of this paper is to design and develop a basis geospatial data management system. It offers database building, conversion, topology check, query statistics, data extraction, cartographic output, analysis and decision-making for massive geospatial data on a range of basic geospatial data management function. The main research includes the design of basis geospatial database, data management system and the key technologies in system development. Geographic information from 2D to 3D is the result of technical progress and demand-driven, 3D modeling and 3D visualization environment-based spatial analysis and query is the future development direction of the geospatial data management system.
Analysis on Internet Attack and Security
Authors: Chen Jing
Published: December 2012

The rapid upgrading internet has brought to us many shortcuts and conveniences. Simultaneously, the underlying security problems have surfaced. These include unauthorized access, posing as legitimate users and destroyed data integrity, which interferes with the normal operation of the system. In addition, these computer network invasions are characterized by the focused attacking source, flexible attacking strategies and expanded scope of the attacked target. This paper analyzes the existing network security risks and means of invasion from various aspects; the network security defense measures are discussed here.
Weapon-Target Assignment Problem in the Warship Fleet Based on Fast and Elitist Non-Dominated Sorting Genetic Algorithm
Authors: Chen Xin Lai , Shen Song
Published: December 2012

Represent a new Weapon-Target Assignment (WTA) model of warship fleet as to the characteristic of the modern naval battle field and the battle modality. This model considers the WTA to a multi-objects optimization problem, and a Fast and Elitist Non-Dominated Sorting Genetic Algorithm (FENSGA) is applied to resolve this model. The FENSGA can reach a set of wide-distributing, robust solution. One running of the FENSGA can reach a multi-Pareto solution, which the commander can select from. A simulation is given to prove the validity of this model and algorithm.
A B/S-Based Multi-Server Framework for Knowledge Component Implementation
Authors: Ming Zhen Jun , Hao Jia , Yan Yan , Wang Guo Xin
Published: December 2012

Knowledge reuse is of great significance for enterprises which rely mainly on new product development or design. For reusing knowledge, knowledge component is a feasible and efficient method. However, the implementation of knowledge component is still a new field to be researched. In this paper, a B/S-based multi-server framework to support knowledge component implementation was proposed. In the framework, a B/S-based knowledge component operating structure was introduced to make it easier for the product designers or developers to use the knowledge component. In order to reduce the computing time and alleviate the workload of the server-side, a multi-server mode was designed to separate the knowledge component operating process into three tiers (data tier, logic tier and computing tier). To improve the utilization of the limited computational resource, a real-time scheduling scheme was proposed to allocate the application software service to dynamic requests. Testing results proves that this framework is feasible and can help the designers reuse the existing knowledge rapidly. This framework will be significantly helpful to those enterprises interested in unlocking the potential of design knowledge reuse.
A Collaborative Filtering Recommendation Method Based on Item Category
Authors: Deng Wei Bin , Liu Jin
Published: December 2012

Traditional collaborative filtering algorithms are facing severe challenges of sparse user rating and real-time recommendation. To solve the problems, the category structure of merchandise is analyzed deeply and a collaborative filtering recommendation algorithm based on item category is proposed. A smooth filling technique is used for rating matrix with user preferences and all users rating on the item to solve the sparse problem. A user has different interests on different category. For every item, the nearest neighbors are searched within the category of the item. Not only is the search space of the users’ neighbors reduced greatly, but also search speed and accuracy are promoted. The experimental results show that the method can efficiently improve the recommendation scalability and accuracy of the recommender system.