bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Clinching with AC Servo Direct-Drive Device
Authors: Han Xiao Lan , Zhao Sheng Dun , Xu Fan
Published: May 2014

The purpose of this paper is to develop clinching technology using AC servo direct-drive device. The control systems of AC servo direct-drive device are designed to control the clinching. It could accurately control the connection of aluminum alloy 6061 sheets with the round joint. The joint quality is evaluated by the tensile tests. The results of the tensile tests shown that fracture load satisfied the required joint strength. Meanwhile, AC servo direct-drive device also could ensure the efficiency and quality of clinching process.
Free Form Shape of Machine Parts Design Based on Microcomputer CAD/CAM System
Authors: He Long
Published: May 2014

CAD/CAM system is one of the most widely used software in the field of mechanical design and manufacturing. The design of the mechanical parts generally uses CAD/CAM software, such as SolidWorks, Unigraphic, Pro/Engineer etc.. In this paper, by using UG software as a development platform, we use the software of UG/OPEN GRIP and UG MACRO as secondary development tool to realize the customization and development of general model of CAD/CAM system, and apply it in the design of professional free format machine parts. In the CAD/CAM system we put free format into parts manufacturing process and technology, and put forward the simple and effective process flow, so as to realize the optimization of CAD/CAM system. It provides the technical reference for the design and process of mechanical components.
Application of Pre-Mixed Abrasive Water Jet to Quit Anchor Underground
Authors: Meng Fei Wu , Sun Zhen Zhen , Hu Ya Lin
Published: May 2014

In coal production, those supporting anchor generally remain in the rock , at the endof the mine mining .We need to recover the anchors to maximize savings and reducing consumption , and accelerate the working face roof caving in roadway . The paper through the analysis of the disadvantages of traditional anchor back , put forward the application of pre-mixed abrasive water jet technology to the cutting of anchor rod and anchor rope . The experiments show that the technology not only meets the requirements of underground safe production, but has good cutting effect , high efficiency , saving a lot of manpower and time.
Servo Drives’ Reliability Prediction Based on Analytical Method
Authors: Mi Wei , Yan Ying Min
Published: May 2014

For servo drives are expected to reliability problems, a comprehensive approach based on Analytical method is adopted. First, the principle of the servo drives are analyzed to study its structure and composition and further function modules. Then the solution of each circuit component parameters, environmental stress and electrical stress conditions than parameters, based on GJB/Z 299C-2006 to establish the reliability of the model, computing unit, system failure rate, and average working life (MTBF according to the characteristics of series and parallel components ). Finally, using Relex servo drive reliability modeling and simulation to verify the results of stress analysis method.
Design of Switching Power Supply in High Performance Switches
Authors: Liu An , Zhang Hai , Yang Wei , Cao Shun Xia
Published: May 2014

A switching power supply of high performance switches is designed in this thesis, which is able to supply stable power energy to switches. In the paper, I analyze the characteristic of switches load, and analyze the main circuit structure based on the study of basic principle of switches switching power supply. As a key point, I have designed a main circuit which adopts flyback Topological structure, such as, input circuit, rectification filter circuit, output circuit, feedback circuit, ancillary circuit of switches switching power supply and high-frequency transformer. The result of design is able to provide proper power supply for high performance switches.
A High-Speed 64b/66b Decoder Used in SerDes
Authors: Wang Bin , Hu Qing Sheng
Published: May 2014

A high-speed 64b/66b decoder for SerDes system was designed in TSMC 0.18-μm CMOS Technology. The chip is composed of Block Sync, Descrambler, Decode Process and Receive Control. To make the system can be work in high speed, we use a lot of technology such as pipeline strategy, optimization of complicated logics and parallel descrambler.
Analysis and Suppression of High-Frequency Harmonics of High Power Photovoltaic Inverter System
Authors: Deng Pei , Yuan You Xin , Yuan Liang , Kuang Ping , Chen Jing
Published: May 2014

According to the growing need for renewable energy. Grid-connected photovoltaic system is used in many territories. To suppress the high-frequency harmonics of high power photovoltaic inverter, a LC low pass filter (LPF) has been proposed in this paper. The following have been done in the study: analysis of the high power photovoltaic inverter system and its harmonics, method of high-frequency harmonics suppression, and simulation of high-frequency harmonics suppression. According to the normalization method, the parameters of LPF are calculated. Then the parameters are put into a simulation model. The simulation result show that THD is 7.26%. It is much less than the former 78.19%. So it can be widely used in power system to suppress the high-frequency and to ensure the quality of electric energy.
Investigation of Phase-Shifting and Frequency Conversion Sinusoidal Signal Generator Based on DDS and FPGA
Authors: Han Xu , Wang Peng , Li Shan Shan , Zhao Xue
Published: May 2014

The direct digital frequency synthesis (DDS) technology has high frequency resolution, fast frequency switching, low phase noise and higher frequency stability, so it is widely used in communications, aerospace, instrumentation and other fields. In this paper, the DDS system was designed based on Field Programmable Gate Array (FPGA) and hardware design language (VHDL). The experimental and simulation results show that the system has stable output frequency, high frequency accuracy, adjustable frequency and phase.
Active Power Optimization Considering both Generation Cost and Network Loss
Authors: Chang Xue Fei , Lv Xiang Yu , Li De Xin
Published: May 2014

In order to improve the calculation efficiency, active power and reactive power are usually optimized separately in optimal power flow considering the decoupling characteristic. However, this would decrease the economy performance of power system. This paper proposed a weighting factor to formulate a multi-objective model, combining the generation cost and system network loss together. The optimization problem is performed using genetic algorithms and quadratic programming respectively. Finally, the feasibility and efficiency of the proposed model are verified with the IEEE 14 Bus test system.
Hydrothermal Synthesis of α-MnO2 Nanostructures at Low Temperature and their Electrochemistry Properties
Authors: Li Si Liang , Guo Ya Jie , Pu Jing Juan
Published: May 2014

A novel three-dimensional MnO2 have been successfully prepared by a facile hydrothermal route without any catalysts below 90oC. They were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, the obtained α-MnO2 nanorods showed excellent capacitive behavior, cyclic voltammograms stability and favorable electronic conductivity.
Study on Crosslink Density of Natural Rubber with Different Initial Moisture Contents Dried by Microwave
Authors: Zhang Fu Quan , Wang Yong Zhou , Chen Mei , Huang Mao Fang , Zeng Ri Zhong
Published: May 2014

In this work, the crosslink density of uncured natural rubber with different initial moisture contents, 3.80%, 10.05%, 19.76%, 23.68%, respectively, dried by microwave at frequency of 2450MHz was studied using nuclear magnetic resonance spectrometer. Seen from the results, the effect of initial moisture content of wet natural rubber on crosslink density and processability were obvious. With the increment of initial moisture content of wet natural rubber, the crosslink density of natural rubber after microwave dried with the frequency of 2450MHz decreased gradually. The crosslink density and A(Mc) of natural with the lower initial moisture content was bigger compared with natural rubber with the higher initial moisture content.
A Q-Learning-Based Downlink Power Control Algorithm for Energy Efficiency in LTE Femtocells
Authors: Huang Lian Fen , Wen Bin , Gao Zhi Bin , Cai Hong Xiang , Li Yu Jie
Published: May 2014

Femtocell is introduced to improve indoor coverage, which is beneficial for both users and operators. But it will also inevitably produce interference management issues in the heterogeneous network which consists of femtocells and macrocells. In this paper, a decentralized Q-learning-based power control strategy is proposed, comparing with homogenous power allocation and smart power control (SPC) algorithm. Simulation results have shown that Q-learning-based power control algorithm can implement the compromise of capacity between macrocells and femtocells, and greatly enhance energy efficiency of the whole network.
Rols of ZnO in Cu-ZnO Catalyst for Dehydrogenation of Sec-Butanol
Authors: Deng Jun , Liu Ying , Zhang Hong Sheng
Published: May 2014

A series of varying Cu/Zn ratio Cu-ZnO catalysts prepared by coprecipitation were evaluated for the vapor-phase dehydrogenation of sec-butanol (SBA) to methyl ethyl ketone (MEK) and characterized to investigate the roles of ZnO by X-ray diffraction (XRD), H2temperature programmed reduction (H2-TPR), N2O chemisorption decomposition. When Cu/Zn was 1:1, Cu-ZnO catalyst exhibited excellent reactivity. The catalytic properties of Cu-ZnO did not completely depend on Cu content and Cu0surface area, revealing SBA dehydrogenation is a structure-sensitive reaction.
Monitoring Mechanical Vibration Amplitude System Design Based on the PVDF Piezoelectric Film Sensor
Authors: Zhu Jia Lin , Li Li
Published: May 2014

Vibration monitoring of machinery and equipment plays a very important role in judging the equipment maintenance and operational status. This paper discussed the mechanical vibration amplitude measurement system scheme based on PVDF piezoelectric sensors. The entire test system is mainly composed of PVDF piezoelectric film sensors, charge amplifiers, data acquisition and processing and display of valid values. It can display the amplitude of vibration signals in real time and alarm. The measurement system has the advantages of a simple structure and convenient operation.
A New Design of Laser Driver Circuit Controlled by ARM Used in a Gas Detection System Based on TDLAS
Authors: Guo Yue Jun , Cheng Wan Qian , Wang Biao
Published: May 2014

Tunable Diode Laser Absorption Spectroscopy (TDLAS) is a technique for gas detection based on the laser’s characteristics of wavelength scanning and current tuning. It has the advantage of high selectivity, high resolution, high sensitivity and fast reaction speed. The TDLAS detection system is based on the principle of the harmonic detection which is a technique making a signal modulated by a high frequency one scanning for the absorption peak of the gas to be detected, and then processing the detected signal using double frequency of the modulation signal as the reference. In this paper, we designed a laser driver circuit to meet the need of the TDLAS detection system using the LPC2138 microcontroller which is based on an ARM7 CPU as the main controller, using DAC7513 to produce a sawtooth signal, and using AD9958 to produce a sine-wave modulation signal.
Design and Implementation of TT&C System Downlink Signal Simulator
Authors: Fu Gang , Wu Yan Jun , Feng Yue
Published: May 2014

This article through to the Rayleigh channel, les channel and all shadows channel features such as research, put forward the suitable for unified measurement and control system design scheme of downlink signal simulation, using switch module can effectively simulation actual measurement and control environment. The implementation of the system to evaluate the working state of the receiver, troubleshooting, and provided an important tool to find the accident reason.
Study on Electronic License System and Operation
Authors: Dang Qi , Wang Xi Wei , Guo Jing Lin , Tong Xue Song
Published: May 2014

Electronic license operating system is mainly including passive electronic license applications and information technology systems integration of physical construction ideas. This paper introduces a practical application of the anti-metal UHF RFID tag antenna, relying on the existing license plate, the metal plate as part of the antenna to solve UHF RFID tag for metal surface problems. Establishment of cloud computing, combining sea calculation the physical integration of information systems to meet the needs of car networking operations.
Development of Stamping Process CAD System on Automatic Production Line for Robotic Manipulation
Authors: Cao Qi Xian , Xiao Xiao Ting
Published: May 2014

. When transporting the large and medium-sized stamping parts on automatic stamping production line, robotic end picking-up device (tooling) needs reasonable clamping positions to ensure smooth precision transmission and safe production. Based on UG platform, this paper has used the secondary development technique to develop a stamping process CAD system on automatic production line for robot manipulation with UG/Open API functions in Visual c++ 6.0 environment, the system can quickly analyze the stamping process and the clamping positions for robots and generate a three-dimensional entity mould, which effectively shorten the production line product development cycle, improve the quality and production efficiency of stamping parts.
Adaptive Control for Discrete-Time Systems with Time-Varying Delay
Authors: Han Cun Wu , Sun De Hui , Bi Song
Published: May 2014

This paper presents an adaptive robust controller for discrete-time systems with time-varying uncertainty and time-varying delay. The controller is designed based on the online parameter estimation and robust H∞ approach. Simulation result is given to verify the effectiveness of the proposed controller.
Study on Fuzzy PI Control of Vehicle Yaw Moment Based on Optimal Allocation of Braking Forces
Authors: Li Gang , Han Hai Lan , Wang Chao , Ma Gao Feng
Published: May 2014

For vehicle direct yaw moment control (DYC) ,the additional yaw moment decision method based on the fuzzy PI control and optimal allocation method of yaw moment based on quadratic programming are studied. Yaw moment control adopts hierarchical control method.The fuzzy PI controller and brake force optimization distributor are designed. The control method is verified through the Matlab/Simulink and CarSim co-simulation experiment.The results show that the control method can make the vehicle track the expected value better and improve the driving stability effectively.
The Reliability Analysis and Simulation Method of Train Control System Based on Markov
Authors: Wei Shang Guan , Xiao Jie , Cai Bai Gen , Wang Jian
Published: May 2014

This paper mainly studies the reliability of trackside subsystem of the CTCS-3 train control system. Dynamic fault tree method is used for reliability analysis. The fault tree is decomposed into static and dynamic sub-trees. Based on Markov method, precise quantitative analysis is performed on the dynamic sub-tree. The failure probability of the trackside subsystem is calculated. Through analyzing the structural importance degree and pivotal importance degree of the bottom events, suggestions for improving the reliability of the system are concluded.
Multivariate Regression Model Analysis Based on Positive Feedback Effect of Automatic Control System
Authors: Wu Wei
Published: May 2014

The net profit of the enterprise is the balance of total corporate profits after income tax, mainly from business and enterprise project investment, but preferential tax policies of the countries have an important role in the corporate R&D investment field, also to bring great gains. This paper focuses on the current situation of China's R&D analysis and multiple regression model to carry out R&D investment related empirical analysis of industries and enterprises in Shanghai in 2011, and eventually come to optimize the system of tax incentives for R&D investment with positive feedback.
Countdown Frequency Measurement and its Application in Radar AFC
Authors: Shi Xiong
Published: May 2014

High stability and constant-temperature crystal oscillator as time standard, microcontroller as control core, the countdown frequency measuring electric circuit, rapidly and timely surveying the transmitting frequency during the constant radar transmitted pulse, is a digital frequency measurement module. This module is an important constituent part in digital automatic radar frequency control system, having been successfully applied in a self-adaption frequency control system of meter wave warning radar.
Fault Diagnosis of MOVA Based on Evidence Theory
Authors: Zhou Ai Hua , Song Hong , Fang Yu , Chang Zheng Wei
Published: May 2014

The health of MOVA is very important for power system reliability and insulation coordination studies.MOVA is subjected to different kinds of stresses in services, which will cause degradation at early stage or in the long run.This paper present evidence theory for fault diagnosis of MOVA. Evidence theory can simultaneously analyze information from different sources,draw comprehensive conclusions,reduce single information misjudgment. In this paper, resistive leakage current and infrared imaging make up two types of evidence body for judge. Analysis of experimental data shows that this method can effectively detect early fault of the MOVA.
A Motion Edge Closing Method of Motion Edge Detection
Authors: Wu Xiao Qing , Long Xiang , Yang Xiong
Published: May 2014

We proposed a motion edge detection method in our previous work. However, the edge of the moving object detected from the image sequence is always unclosed. In this paper, we propose a method of a hybrid field snake to close the edge of the object. The initial curve of the snake is rectangle, so that the curve can be used in the tracking and recognition applications, but its corners always locate out of the GVF field. The hybrid field snake method is proposed to solve this problem. Some experiments are performed at the last part of this paper to test our method, and the results are satisfactory.
Development of SnS Thin Films for Solar Cells
Authors: Wang Zhi Gang , Gao Wen Cheng , Li Jing , Liu Ke Gao
Published: May 2014

SnS thin film, a potential earth-abundant photovoltaic material, has particularly generated interest because of its nontoxic nature, the band gap of it matches well with solar spectrum and its high absorption coefficient. It provides a brief description of the development of SnS thin film for solar cells, and surveys several preparation methods of SnS thin film, then introduces the crystal structure of SnS. The effects of different doping elements and concentrations for SnS thin film on performance were outlined, and the development and the structure of solar cells based on SnS thin films were discussed. Finally, the development tendency and prospects were predicted.
Improved SURF Detection Combined with Dual FLANN Matching and Clustering Analysis
Authors: Li Jun Fei , Wang Geng , Li Qiang
Published: May 2014

In this paper, an improved object detection method based on SURF (Speed-Up Robust Feature) is presented. SURF is a widely used method in computer vision. But it’s still not efficient enough to apply in real-time applications, such as real time object tracking. To reduce the time cost, the traditional descriptor of SURF is altered. Triangle and diagonal descriptor is adopted to replace the Haar wavelet calculation. Then dual matching approach based on FLANN is employed. Thus matching errors can be cut down. Besides, the traditional SURF does not give the accurate region of the target. To restrict the area, clustering analysis is used which is promoted from K-WMeans. Experimental work demonstrates the proposed approach achieve better effect than traditional SURF in real scenarios.
Aluminum Profile Type Recognition Based on Texture Features
Authors: Liu Zhen Hua , Shi Hai Bo , Zhou Xiao Feng
Published: May 2014

Because aluminum profile’s structure is complex and diverse, we need to match the different parameters for different profiles before automated detection of surface defects of aluminum profile. This process often requires manual input, affecting the detection efficiency. To solve this problem, we analyze the characteristics of aluminum profile, through GLCM algorithm and Gabor wavelet transform methods, which are image texture feature extraction methods to get aluminum profile’s texture feature, then we use the Support Vector Machine (SVM) classification algorithm based on radial basis function (RBF) core classify the feature, for the aim of matching parameters automatically. By feature extraction time and the recognition accuracy rate and other indicators to compare the experimental results of each method, derived using Gabor wavelet transform is the best both on recognition accuracy or identify time effects, and can satisfy the actual needs.
A Technique Method of Recycling Sylvite Zinc Plating Waste Liquid in Laboratory
Authors: Shi Lei , Li Da Yong
Published: May 2014

It introduces a kind of technique method that recycling sylvite zinc plating waste liquid laboratory, involving the fields in electroplating and comprehensive utilization of waste liquid. It includes the following steps: first add hydrogen peroxide and activated carbon into waste liquid to remove the organic matter in it, and then reduce the solution’s temperature with refrigeration film, and filter out the solid contents. Add NaOH solid, NaHSO3into the solution, through chemical reactions, precipitate the heavy metal element, and finally get distilled water through distillation. It can make the recycled materials be reused, such as distilled water, boric acid, etc., and as to nonrecyclables, such as heavy metal ions (Cu2+, Cr3+), bury them deep that disposing harmless.
Forced Vibration Measurements of Clinched Joints
Authors: He Xiao Cong , Liu Fu Long , Cun Hua Ying , Yang Hui Yan , Xing Bao Ying , Zeng Kai
Published: May 2014

As a result of the trend towards lightweight construction in manufacturing, there has been a significant increase in the use of clinched joints in engineering structures and components. Mechanical structures assembled by clinching are expected to possess a high damping capacity. The aim of this paper is to provide an experimental measurement technique for the investigation of the forced vibration behavior of clinched joints. The dynamic test software and the data acquisition hardware were used in the experimental measurement of the dynamic response of the clinched joints. The frequency response functions of the clinched joints of different clinching point number were measured and compared.
Research on Airport Navigation Light Simulation System
Authors: Li Wei Qing , Tang Yang , Liu Long , Xu Ye
Published: May 2014

The airport navigation light simulation system is designed to improve the ability of navigation light’s operators. The structure of airport navigation light system is introduced. To simulate the faults of light circuit, the fault model of light circuit for airport navigation system is built and is verified by simulation experiment. A power flow calculation algorithm is completed based on the equivalent circuits of airport navigation system. Method of bisection is taken to locate the faults of the light circuit in the simulation system. The airport navigation light simulation system is built for operator training and it works fine.
Simulation Study of Road Identification on Dynamic Identification Interval
Authors: Zhang Xiao Long , Sun Ren Yun , Zheng Lei , Ge Heng Yong
Published: May 2014

In order to complete road identification, dynamic identification interval is built according to the six typical road adhesion coefficients which don’t overlap with each other, using road adhesion coefficient as its parameter index under Burckhardt model. It’s concluded from simulation tests about single road and variational road based on brake single wheel model that this method is capable of managing to conduct road identification accurately and immediately, realizing automatic identification under real-time slip rate and correcting identification errors automatically.
Detecting System of Crop Disease Stress Based on Acoustic Emission and Virtual Technology
Authors: Yang Shi Feng , Xue Long , Zhao Ji Min
Published: May 2014

A system for detecting the conditions of crop disease stress by acoustic emission technology was studied and developed .The PCI-2 acoustic emission board and R15 acoustic emission sensor probes were chosen to construct the hardware detecting system, and the AEWIN software and virtual instrument technology were utilized to construct the software system, a real-time acquisition and detecting system for the information between acoustic emission and disease stress of crop was established. The results show that there are a certain physiological cycle laws in the acoustic emission of healthy crop, generally the “double peak area” can appear; but distortion can occur in the acoustic emission of disease stressed crop, a sharp increase of the acoustic emission frequency can suddenly take place at some time, immediately the crop begins to show disease symptoms, and acoustic emission signals lose the regularity.
Study on the Compressed Matrices in Compressed Sensing Trilinear Model
Authors: Li Shu , Zhang Xiao Fei
Published: May 2014

In this paper, we make study on the compressed matrices in the compressed sensing trilinear model-based angle estimation algorithm, whose complexity is lower than conventional trilinear decomposition-based method, due to the use of compressed matrices. And we take the problem of angle estimation for bistatic multiple-input multiple-output (MIMO) radar as an example. Simulation results can provide reference for the choice of compressed matrices.
Application of Matrix in Computer Science and Technology
Authors: Deng Ji Xia
Published: May 2014

Application of matrix in the field of computer is too much.It is a simple calculation tool, can be represented in a simple form and complex form. This paper gives several examples about computer science and technology, to answer by using matrix method. In order to guide the students to know the application of matrix in the computer science and technology to stimulate interest in learning.
An Algorithm Applying to NPC Path Planning of Web Games
Authors: Zhang Cheng , Zhang Kun , Zhang Ying Qian , Dan He
Published: May 2014

Path planning is the core issues in the artificial intelligence field of games, and how to establish an effective method of path planning is still focused on. A new algorithm based on both the benefits of global path planner methods and local path planner methods and those of A star algorithm and improved artificial potential field method is proposed for NPC path planning in web games. Its feasibleness and effectiveness are also demonstrated by simulation results.
Expected Cost Based Greedy Scheduling Algorithm for Out-Tree Task Graphs
Authors: Zhang Jian Jun , Wang Tian Hong , Wang Yu Zhuo
Published: May 2014

Effective task scheduling is crucial for achieving high performance in heterogeneous computing environments. Whiling scheduling Out-Tree task graphs, many previous heterogeneity based heuristic algorithms usually require high scheduling costs and may not deliver good quality schedules with lower costs. Aiming at the characteristics of Out-Tree task graphs and the features of heterogeneous environments and adopting the strategy based on expected costs and task duplications, this paper proposes a greedy scheduling algorithm, which, at each scheduling step, tries to guarantee not to increase the schedule length, schedules the current task onto the used processor which minimizes its execution finish time; meanwhile, takes load balances into account to economize the use of processors. The comparative experimental results show that the proposed algorithm has higher scheduling efficiency and robust performance, which could produce better schedule which has shorter schedule length and less number of used processors.
A Novel Symbolic Representation Based on Fast Segmentation
Authors: Yin Hong , Yang Shu Qiang , Yin Ping , Jin Song Chang , Zhao Hui
Published: May 2014

Symbolic representation of time series has recently attracted a lot of research interest. This is a difficult problem because of the high dimensionality of the data, particularly when the length of the time series becomes longer. In this paper, we introduce a new symbolic representation based on fast segmentation, called the trend feature symbols approximation (TFSA). The experimental results show that compared to some method, the segmentation efficiency of TFSA is improved.
A Segmentation Method of Traffic Marking Based on Average Gray Approximating the Optimal Threshold
Authors: Chen Zu Sheng , Wu You Fu
Published: May 2014

Image segmentation technique was used widely for computer vision and image processing. A robust technique of image segmentation plays a crucial role in identification problem. In this paper, a nonparametric and unsupervised method of automatic threshold for segmenting image was proposed, i.e. the optimal threshold is approximated by global average gray and local average gray, and this method was compared with other methods by using standard image. The experimental results show that our method proposed in this paper is robust. In addition, an image database of road traffic marking (www.ananth.in/RoadMarkingdetection.html) is provided to do this experiment for testing our method, the results show that our method is excellent.
Numerical Simulation of Groundwater Flow Based on CUDA
Authors: Zhou Yan , Nan Tian , Cui Ya Li , Cheng Tang Pei , Shao Jing Li
Published: May 2014

In this work, in order to improve the operation speed of groundwater flow numerical model, we studied the approach of solving linear equations and the relative acceleration problems based on CUDA platform. We developed the GPCG module base on GPU platform to replace PCG module of MODFLOW 2005 by using NVIDIA TESLA C2070. We obtained the effective acceleration results on GPU platform, by establishing series of ideal and instance models, which showed that the overall speedup of the models is around 2.5times and the calculation speedup is about 10times.
Text Clustering Based on Domain Ontology and Latent Semantic Analysis
Authors: Li Ya Xiong , Pan Deng
Published: May 2014

One key step in text mining is the categorization of texts, i.e., to put texts of the same or similar contents into one group so as to distinguish texts of different contents. However, traditional word-frequency-based statistical approaches, such as VSM model, failed to reflect the complicated meaning in texts. This paper ushers in domain ontology and constructs new conceptual vector space model in the pre-processing stage of text clustering, substituting the initial matrix (lexicon-text matrix) in the latent semantic analysis with concept-text matrix. In the clustering analysis stage, this model adopts semantic similarity, partially overcoming the difficulty in accurately and effectively evaluating the degree of similarity of text due to simply taking into account the frequency of words and/or phrases in the text. Experimental results indicate that this method is helpful in improving the result of text clustering.
M/M/1 Queue Model with Uncertain Parameters by Monte Carlo Simulation
Authors: Liu Yang
Published: May 2014

M/M/1 model was the most important and basic of all queue models. The paper combined Monte Carlo simulation with traditional M/M/1 model. The paper set an example of traditional M/M/1 system and calculates its indicators of performance firstly. Secondly, define the parameters with combination of the observation data and Delphi results. Thirdly, do Monte Carlo simulation with computer and software. In the end, compare the results by two methods. The results showed that the performance could be acceptable and did not need to make any improvements in case of traditional calculation. But, lots of things had been changed when the parameters had become uncertain. All indicators showed a big risk after the Monte Carlo simulation. Compare the results of traditional M/M/1 model and Monte Carlo simulation; it was found that it was necessary to treat this kind of problem as an uncertain problem in order to improve the accuracy of decision making.
On the Microstructure of a Biocomposite Fabricated from Bioceramics and 3D Ti-Mesh by Dip Coating Method
Authors: Yi Wei , Sun Xu Dong , Niu Dun , Hu Xiao Zhi
Published: May 2014

Sintering reactions and fine structure of a biocomposite fabricated from hydroxyapatite (HA) powder, glass-ceramic (GC) powder and titanium mesh by dip coating method were investigated. A dense GC coating was initially deposited onto 3D Ti-mesh, which is to seal off the Ti-mesh. Then, a microporous HA-GC coating was deposited on the top of the dense GC coating to promote bone regeneration. Interfacial reactions play the key role for the coatings/substrate adhesion. During the fabrication process, the Ti substrate reacted with O2and produced the TiO2(rutile phase). TixSiywas detected in the GC coating/Ti substrate interfacial region. The average bonding strength between dense GC coating and Ti substrate was 27.1 MPa.
A New Differential Evolution Algorithm with Random Parameters
Authors: Huang Shao Rong
Published: May 2014

Differential evolution algorithm’s performance often depends heavily on the parameter settings. Based on analyzing the influence of the parameters setting in the experiment, the effects and the optimal selection of those major parameters on DE are analyzed, and some conclusions are derived. A new differential evolution algorithm which the scale constant (F) and crossover constant (CR) are generated as random numbers within a certain range in each iteration process is proposed. The experimental results shows that the new algorithm is simple, easy to realize and can get higher precision and better stability.
Binary Particle Swarm Optimization (BPSO) Algorithm for Distributed Node Localization
Authors: Shin Soo Young , Zain Ifa Fatihah Mohamed
Published: May 2014

In this paper, we propose a binary particle swarm optimization (BPSO) algorithm for distributed node localization in wireless sensor networks (WSNs). Each unknown node performs localization under the distance measurement from three or more neighboring anchors. The node that gets localized will be used as a reference for remaining nodes. A comparison of the performances of PSO and BPSO in terms of localization error and computation time is presented using simulations in Matlab.
A Basic Computation Model of Added Mass on Ship Section with Green Function
Authors: He Xiong Jun , Huang Yan , Lan Min , Jin Sheng Ping , Zhang She Sheng
Published: May 2014

A basic mathematic model of ship section added mass is important for the ship dynamics research. According to the fluid dynamics control equations, the numeric formula of added mass is derived by using Green function. The representation form of added mass is discussed on basic domain of integral function.
Research of Basic Framework Construction for Computational Philosophy
Authors: Xie Qing Song , Fan Hui , Li Da She , Zhu Hai Yan
Published: May 2014

The basic framework of computational philosophy has been established in this paper: core, innovation, system and methodology. The core is to seek unified theory of computation (UTC), which is the “hard core” in the research program of computational philosophy; the main purpose of innovation is to provide new research methods of philosophy for various computational theories, innovation is the most characteristic in computational philosophy, and is also the key for computational philosophy to establish its status in philosophy; its system is based on innovation research, and explains, models and provides solutions for traditional and new problems via the concepts, methods, tools and techniques of computation; methodology explains concepts, principles and methods in the computational discipline as well as other related disciplines to build the framework of meta-theoretical analysis based on innovation research.
A Variable Mode QR Decomposition Adaptive Filtering Algorithm for Acoustic Echo Cancellation
Authors: Li J.B. , Lu C. , Zhou Y.
Published: May 2014

This paper studies a new QR decomposition adaptive filtering algorithm for acoustic echo cancellation (AEC). Based on the p-TA-QR-LS algorithm [1] and an efficient voice activity detection technique, the proposed algorithm can distinguish the significant and insignificant input data periods. The resultant variable mode p-TA-QR-LS algorithm can work between two modes (p=1and N) and is thus suitable for AEC application where reusing significant input data can enhance convergence and the computation cost can be saved when the input is relatively weak.
Bacterial Foraging Optimization Algorithm with Quorum Sensing Mechanism
Authors: Shen Hai , Zhang Mo
Published: May 2014

Quorum sensing is widely distributed in bacteria and make bacteria are similar to complex adaptive systems, with intelligent features such as emerging and non-linear, the ultimate expression of the adaptive to changes in the environment. Based on the phenomenon of bacterial quorum sensing and Bacterial Foraging Optimization Algorithm, some new optimization algorithms have been proposed. In this paper, it presents research situations, such as environment-dependent quorum sensing mechanism, quorum sensing mechanism with quantum behavior, cell-to-cell communication, multi-colony communication, density perception mechanism. Areas of future emphasis and direction in development were also pointed out.
Research of EDM Titanium Alloy TC11 Based on GM(1,N) Model and BP Neural Network
Authors: Gao Ji , Sun Yao , Wang Di
Published: May 2014

In order to predict the influences of electrical discharge machining (EDM) and enhance material removal rate (MRR). A model was presented for predictions of MRR in EDM TC11 test piece based on the construction method of gray GM(1,N) model and BP neural network model (GNNM).The results show that the GNNM is credible with the maximum absolute error 3.58%, the minimum absolute error 0.01% and the mean error 0.53%were obtained .The results indicated that the model can reflect the technological law of EDM TC11 and successfully predict its processing speed .The paper provides references and basis for selecting processing parameters of EDM TC11 and has practical significance.
A Robust Operator Functional State Fuzzy Modeling Approach Based on EEG Data
Authors: Yang Shao Zeng , Zhang Jian Hua
Published: May 2014

Operator functional state (OFS) is defined as the time-variable ability that an operator completes his/her assigned tasks. To evaluate the OFS in safety-critical human-machine systems, it is modeled by using the Wang-Mendel-based fuzzy system paradigm in this paper. The fuzzy model is constructed to correlate three EEG features (as model inputs) to the human-machine system performance (as model output). To derive a fuzzy model for real-time OFS assessment, the Gaussian membership function membership crossover point membership gradeδis found to be an essential parameter that controls the robustness of data-driven fuzzy models. The fuzzy models with differentδare applied to the OFS fuzzy modeling. The results have demonstrated that an appropriate value ofδcan be selected to derive robust fuzzy models. Compare with the results obtained by fuzzy models based on symmetric Gaussian membership functions, the new approach based on asymmetric Gaussian membership function leads to considerably improved robustness performance.
Analysis of Suspected Change Domain Based on Merged Model
Authors: Juan Zhao , Fang Xian Wen , Liu Xiang Wei
Published: May 2014

Analysis of suspected change domain has become the key problems in the area of business process management. But when input models are large complex process models, existing methods have obvious limitations. An analysis method of the change region based on merged Petri model in the paper. Firstly, several complex models are merged into a model with identifiers. Then, an algorithm for extracting the digest from the merged model is given, and the changes are optimized based on module behavior profile. Finally, the suspected changes are analyzed by the traceability of the merged model. The theoretical analysis and specific example show the method is effective.
Numerical Simulation of the Effection of Inlet Velocity in GaN Growth by MOCVD
Authors: Peng Dong Sheng , Chen Zhi Gang , Tan Cong Cong
Published: May 2014

A mathematical model for the growth of gallium nitride in a vertical impinging metalorganic chemical vapor deposition (MOCVD) reactor is developed. The dependence of the GaN film and the uniformity of the deposited layers on the inlet velocity is investigated to gain greater insight into the reactor performance and characteristics. Based on the simulation results, discussion is presented in this paper to offer the possibility of better control of the GaN film growth process and to ultimately lead to an optimization of the process.
Flow Simulation of Transfer Station and Optimization of Skirtboard
Authors: Zhang Bo
Published: May 2014

Belt conveyor system for bulk material in large plants usually needs amounts of transfer station, which are one of most important dust generation areas. The dust generation mechanism of transfer station is that bulk material dropping down from high site causes air flow and small particle material move with air. The skirtboard of transfer station can restrain dust to some extent through airproofing its flow. Gas-solid flow in transfer station is simulated with Computational Fluid Dynamics (CFD) method in this paper. Based on the simulation results of traditional rectangular skirtboard, an optimized skirtboard is proposed. Contrast of two plans’ simulation results indicates that the new one can restrain dust obviously, which is significant for material saving and environment protecting.
Spectrofluorimetric Determination of Bilirubin Using Enoxacine-Terbium Probe
Authors: Bian Wei Wei
Published: May 2014

A new spectrofluorimetric method was developed for determination of trace amount of bilirubin. Using enoxacine–terbium ion as a fluorescent probe, in the buffer solution of pH=5.8, BR can remarkably reduce the fluorescence intensity of the ENX-Tb3+ complex at λ=545nm and the reduced fluorescence intensity of Tb3+ ion is in proportion to the concentration of BR. Optimum conditions for the determination of BR were also investigated. The linear range and detection limit for the determination of BR are 1.0×10-7～4.5×10-6mol/L and 8.1×10-8mol/L. This method is simple, practical and can be successfully applied to assess BR in serum samples.
EDM Quality Control and Machining Paramenters Optimization
Authors: Sui Xiu Wu , Fan Bo Xue , Zhou Duo , Liu Guan Ping , Luo Ru Jin
Published: May 2014

The machining parameter is very important for quality control in electrical discharge machining (EDM). This paper analysis the pit size in different electric parameter based on ANSYS, and then revises the simulation results according to the experiment test data. Taking advantage of numerical fitting methods to determine the relationship between electric parameters and machining quality. The experiments show the ratio of prediction to test for Vm , Ra , θ is 120.58%,108.18%,78.47% separately. The precision is higher and it can meet the need of the actual processing.
The Friction Model of Dynamic-Wheel Model Based on LuGre Model
Authors: Guan Hsin , Duan Chun Guang , Lu Ping Ping
Published: May 2014

With the development of the simulator and the increase of vehicle model simulation frequency, the ring tire models become the research focus. The ring model considers the physical characteristics of the tire, thus it can more accurately describe the tire force transmission. State Key Laboratory of Automotive Simulation and Control of Jilin University has developed a dynamic wheel model. This model takes the tire crown part as a rigid-ring and describes the elasticity of the tire by using six spring-dampers to connect the rigid-ring with the wheel rim. This paper focuses on the logical judgment of dynamic, static friction between tire and road. Based on the logical analysis, the tire forces at transient process are researched in order to avoid oscillation. Based on the C language to build simulation program, and embed it into complex vehicle model to simulate different conditions, the simulation results show that the vehicle can start smoothly.
Electronic Structure of Wurtzite Ga0.75Al0.25N: A First Principle Calculation
Authors: Yang Ming Zhu , Wang Mei Shan
Published: May 2014

In order to lay theoretical foundations for preparation of Ga0.75Al0.25N photocathodes, research on ternary Ш-V alloys Ga0.75Al0.25N are carried on. Using CASTEP software package based on density functional theory within a plane wave ultrasoft pseudo potential scheme, total energies, band structures, density of states, and charge distribution of three different structures of wurtzite Ga0.75Al0.25N are calculated. Results show that the structure in which Al atoms in para-positon of interlayer is most stable. Ga0.75Al0.25N is semiconductor with direct band gap. The threshold wavelength is 321.8nm which can satisfy the need of preparation of “solar blind” photocathodes.
A Matching Outputs Approach to Evolutionary Design of Polymorphic Self-Checking Circuits
Authors: Bai Lei , Li Xiang
Published: May 2014

In order to solve the problem of losing optimum structure in the stage of fitness evaluation, a matching outputs approach to evolutionary design of polymorphic self-checking circuits is proposed in this paper. By adding NOT gate to outputs of the candidate circuits, the fitness and the diversity of the population are increased when the matching degree of the output is lower than 1/2. The experiments of evolutionary design for 1-bit self-checking adder are conducted by combining the polymorphic gates with conventional gates. Experimental results show that the proposed method can detect all the stuck-at-faults. The generation of evolution is decreased by 28% to 32% compared with ordinary method in designing polymorphic self-checking circuits. The proposed method enjoys advantages of faster convergence and less iteration.
Analysis of a Crowley-Martin Type Chemostat with Delayed Growth Response and Pulsed Input
Authors: Sun Ming Juan , Zhao Hua Xin , Dong Qing Lai
Published: May 2014

In this paper, we introduce and study a Crowley-Martin type Chemostat model with delayed growth response and pulsed input. We get that the existence and the global attractivity of a ‘microorganism-extinction’periodic solution. We prove that the system is permanent under appropriate conditions, by use of new computational techniques for impulsive and delayed differential equation.
Numerical Simulation of the Launching of Underwater Vehicle
Authors: Huang Hai Long , Cao Wei , Wang Cong
Published: May 2014

The numerical simulation of multipahse flow characteristics during the launch process from the tube of the submarine vehicle are investigated, obtains the variation rules of the movement characteristic of the gas inside the tube, the cavity shape of around the vehicle body, the surface pressure coefficient during the movement process. The resluts show that the launch depth and velocity have significiant impact on the shouder cavitation of the submarine vehicle, the smaller values of the depth and the velocity are, the more obvious shouber cavitation, and which led to the distribution difference of the surface pressure coefficient
Multiobjective Mission Planning for UAV under Uncertain Environment
Authors: Zhu Jing Yao , He Qi Fang , Wang Tie Zhu , Wang Zu Tong
Published: May 2014

The combat environment of Unmanned Aerial Vehicles (UAVs) is filled with uncertain factors, which is complex and dynamic. This paper is devoted to the UAV mission planning problem under uncertain environment with three optimization objectives, such as flight time, fuel usage and threat imposed by enemy. Based on the uncertainty theory and multiobjective programming method, the UAV uncertain multiobjective mission plaaning model is built and solved.