bluuebunny/crossref_metadata_2025 huggingface dataset:
A Quality Model for Success Manufacturing System
Authors: Jeong Hwa Young , Choi Hae Gill
Published: September 2012

The manufacturing system in the factory has been changing more complex, and the user who is system engineer or operator wants more powerful and efficient manufacturing system. Therefore the system developer and designer needs to know the factor what is important quality for the manufacturing system with their needs. This paper propose quality model for success manufacturing system. For this work, we extracted the quality attributes from exist work fitting on their needs. And we construct a quality model to consider their relation each other. Finally we expect our model can be help and give guideline to the system engineers or designers when they make a plan to develop the manufacturing system.
Fabrication of Superhydrophobic Surfaces on Aluminum Substrates via Electrochemical Etching and Re-Deposition
Authors: Song Jin Long , Liu Xin , Lu Yao , Wu Li Bo , Xu Wen Ji
Published: September 2012

Superhydrophobic surfaces on metal substrates are often prepared via roughing the surfaces and lowering their surface energy. The superhydrophobic aluminum surface with a water contact angle of 162.5° and rolling angle less than 6° was fabricated via electrochemical etching and re-deposition using the alkalic Na3PO4 electrolyte and then fluorination treating. The surface morphology and chemical composition were characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The results show that the surface consists of the micrometer-scale lumps and protrusions, and many nanometer-scale mastoids are filled in these protrusions. These hierarchical micro/nanometer-scale binary structures, which are similar to the micro-structures of lotus leaf surfaces, play an important role in achieving superhydrophobicity. The main components of the binary geometric structures are Al2O3, AlPO4, and H2O. The effects of the processing time and processing voltage on the macro-morphology were also investigated. The macro-rough structures appeared on the edge of the aluminum surface firstly, and then spread gradually to the entire surface.
Application of Finite Element Method to Crack Prediction in Laser Cladding Process
Authors: Hao Nan Hai , Qin Zi Xing
Published: September 2012

The cracks in clad layer are the most often defects in laser cladding of low ductility materials. This paper reports the efforts of crack prediction with finite element method. The process is modeled with commercial FEM software package ANSYS and the thermal-mechanical analysis is performed to inquire the strain-stress variation during cladding, especially the variation around the moment of solidification. The analysis result shows that, by the end of cladding, the clad layer is in tension stress and the stress values are varied in directions. The tension stress along the cladding direction is the maximum one, which causes the cracking in clayed layer. Increasing the preheating temperature of substrate is an effective way to avoid the crack generation.
Thermal-Conditioned Braking Torque Control for Modern Wind Turbines
Authors: Yang Zhen Yu , Jepsen Frank , Søborg Anders
Published: September 2012

A new soft-braking strategy for modern Wind Turbines (WTs) is proposed. The braking torque is directly controlled by regulating the caliper’s hydraulic pressure via a controllable pressure valve, subject to some thermal constraints about mechanic braking units. The proposed control strategy consists of a pressure controller, a braking controller and an optimization algorithm for generating a braking torque reference. The modeling issues and some of these design/developments based on a lab-sized setup are discussed. Comparing with the existing WT braking solutions, either through an on/off control, or through some soft-braking mechanism which mainly employs a kind of generator-shaft speed control, the proposed approach can control the brake-induced mechanic stress to the transmission system in a more effective manner, and meanwhile, the thermal stress to the braking units is also explicitly cooperated into this design.
Collision Probability based Safe Path Planning for Mobile Robots in Changing Environments
Authors: Liu Hong , Wang Chuang Qi
Published: September 2012

Automatic path planning has many applications in robotics, computer-aided design(CAD) and industrial manipulation. The property of safety is vital but seldom taken into consideration by typical path planning. In this paper, collision probability is introduced as an evaluation of crowd degree of environments to get a safer path. The smaller collision probability a node has, the more possibly the node can be extended. Meanwhile, the in/out degree of a node is limited to prevent some nodes to be extended excessively. Through evaluating collision probability on-line, a safe path planning based on DRRTs, called Safe-DRRT, is proposed to provide a path not only feasible but also safe. Finally, a path planner is implemented with Safe-DRRT as a guidance and a local planner. In plentifully crowded experiments with moving obstacles, the proposed method has demonstrated to be competent compared to the state of the art.
Experimental Research on Tangential Dynamic Characteristics of Joint Surface in Motor Frame
Authors: Moqi Hao Tian , Xiang Yang , Xia Xue Bao , Liu Hui
Published: September 2012

Characteristic parameters of joint surfaces are needed in kinetic modeling of the motor frame while analyzing its vibration behavior. In this paper, research on tangential dynamic characteristics of mechanical joint surfaces in the motor frame is executed. In order to get the tangential contact stiffness and contact damping of interfaces in the motor frame under different joint conditions, an experimental method is proposed according to the structure feature and running condition of motors. A test platform is specially designed and set up. The kinetic model of test specimens (including the test joint surfaces) is derived. The experimental system is developed. The tangential dynamic contact stiffness and contact damping are identified by the experimental system. The variation rules of the contact stiffness and contact damping with changing of pre-load, exciting frequency and surface roughness are got and summarized. And the rules are consistent with the physical essence of joint surfaces.
Motion Planning for Humanoid Robots in Complex Environments Based on Stance Sequence and ZMP Reference
Authors: Liu Hong , Sun Qing
Published: September 2012

It is a great challenge to plan motion for humanoid robots in complex environments especially when the terrain is cluttered and discrete. To address this problem, a novel method is proposed in this paper by planning the gait according to the stance sequence and ZMP (Zero Moment Point) reference. It consists of two components: an adaptive footstep planner and a walking pattern generator. The adaptive footstep planner can generate the stance path according to the walking rules and adjust the orientation of body relevantly. As the footstep locations are determined, Linear Inverted Pendulum Model (LIPM) is used to generate the walking pattern with a moving ZMP reference. As demonstrated in experiments on the humanoid robot HOAP-2, our method can successfully plan footstep trajectories as well as generate the stable and natural-looking gait in typical cluttered and discrete environments.
A Hybrid Algorithm for Open Vehicle Routing Optimization of Coal Mines Material
Authors: Guo Jin Ling , Yu Shi Wei
Published: September 2012

This study primarily focuses on solving a practical OVRP by applying a novel hybrid adaptive Genetic Algorithm and Tabu Search (GA-TS). The GA-TS combines the GA's parallel computing and global optimization with TS's Tabu search skill and fast local search. In the GA-TS Algorithm, individuals of population do TS local search with a certain degree of probability using natural number coding. It not only ensures global optimization, but also improves the speed of computing. The Algorithm is applied to optimize the mines material transport vehicle routing of China Zhengzhou Coal Mine and power Supply Co., Ltd. Through the applications, the optimal economical transport routing has been set up and economic costs have been greatly reduced.
A Variable Neighborhood Based Memetic Algorithm for Scheduling Single Batch Processing Machine with Non-Identical Job Sizes
Authors: Guo Xiu Ping
Published: September 2012

A variable neighborhood based memetic algorithm (VNMA) is proposed to minimize makespan for a single batch processing machine in this paper. Random instances were generated to verify the effectiveness of VNMA. Comparisons are made through using a genetic algorithm (GA) addressed in the literature as a comparator method. Computational results demonstrate that VNMA outperformed the GA with respect to solutions quality and run times.
Dynamic Allocation of Radio Frequency in the Battlefield Environment
Authors: Liu Jing Xue , Li Zhi Bo , Li Hong
Published: September 2012

Dynamic allocation of Radio Frequency (Hereafter called “RF”) is critical in the battlefield spectrum management. The article analyzes the conventional method of RF dynamic allocation in the battlefield environment, and set up the mathematic model of the RF dynamic allocation by using the results of spectrum detected in battlefield. It designs the algorithms with the combination of Genetic Algorithms and Tabu Search Algorithms. The simulation experiment proves the high efficiency of hybrid algorithms and it suit for solving the RF dynamic allocation problem in the battlefield environment.
Design and Analysis of Motion Mechanism Driven by Several IDMs in Parallel
Authors: Jiang Nan , Liu Jun Biao
Published: September 2012

As a kind of piezo actuator, impact drive mechanism (IDM) has advantages in precision machinery and instruments. Several IDMs are used in parallel to realize some motion mechanisms which have multi degrees of freedom (DOF). Two motion mechanisms are designed subsequently, and a spherical motor is designed and assembled in principle based on one of them. Experiment results reveal that this design method is feasible, but some problems exist, for example, vibration is serious. These problems should be solved in follow-up study.
Optimal Design of Hierarchical Spam Filtering Method Based on Greylisting
Authors: Xia Yun Ye , Zhang Ling
Published: September 2012

With the continuous development of network technology, the proliferation of spam has become a more horrible threat to normal e-mail service than ever before. Although current spam filtration technologies may block some obvious spams, they still fail to recognize large numbers of tricky ones. Therefore, we propose a novel hierarchical spam filtering method called CFBG grounded on Graylisting and use three layers of well-connected modified filtration technologies to fill up those disadvantages of past filtration technologies. The conclusive result of our experiments shows that the new method can provide more powerful filtration and less misjudgment rate reliably.
The Coalmine Industry Gas Safety System Simulation Based on HLA
Authors: Dou Zhi Wu , Feng Yu Hui
Published: September 2012

To solve the inherent safety problem puzzling the coal mining industry, analyzing the characteristic and the application of distributed interactive simulation based on high level architecture (DIS/HLA), a new method is proposed for developing coal mining industry inherent safety distributed interactive simulation adopting HLA technology. Researching the function and structure of the system, a simple coal mining industry inherent safety is modeled with HLA, the FOM and SOM are developed, and the math models are suggested. The results of the instance research show that HLA plays an important role in developing distributed interactive simulation of complicated distributed system and the method is valid to solve the problem puzzling coal mining industry. To the coal mining industry, the conclusions show that the simulation system with HLA plays an important role to identify the source of hazard, to make the measure for accident, and to improve the level of management.
A Study on The Translational Piston Rotary Compressor
Authors: Geng Kui Hua , Geng Ai Nong , Wang Xiang , Du Shi Guang , Tang Meng , Guo Jing
Published: September 2012

The structure and working principle of a new translational piston rotary compressor was introduced and made theoretical analysis in this paper. It was pointed out that the translational piston rotary compressor had not only fine practical, which with less friction loss and leak loss than the traditionally rotary compressor, but also the advantage of simply structure and technics and low manufacturing cost. The rotary compressor was practical and promising.
Preparation and Compressive Strength of PS/PF Biocomposites
Authors: Shao Qiong Fang , Fang Xu Yuan , Yu Qi Jian , Yi Xin Jian , Dong Ming
Published: September 2012

The peanut shell(PS)/phenolic formaldehyde(PF) resin biocomposites were prepared by condensation polymerization.Phenol and formaldehyde respectively dissolved in water in which peanut shell powder is suspended , were copolymerized at 90～950C with H2SO4 as catalyst , resulting in PS/PF biocomposites. It was observed that peanuts shell powder were uniformly dispersed in the biocomposites. Compressive strength of the biocomposites can reach 37.9 MPa, increased significantly comparing with that of phenolic resin obtained in the same conditions.SEM were used to characterize the morphology of the biocomposites.The results of SEM showed that there was less two-phase separation in the biocomposites by controling reaction conditions. It is suggested that the chemical reaction between phenolic resin and PS may be the main reason for the formation of the biocomposites..
Experiment of CRMP on Oil Palm Empty Fruit Bunch Biomass Utilization
Authors: Cheng Feng Zhen , Li You Ming , Hu Jian
Published: September 2012

In this paper, we focus on the possibility for Oil Palm Empty Fruit Bunch (OPEFB) Biomass Utilization by experimenting with chemi-refiner mechanical pulping (CRMP). To understand the process of CRMP, a short description of five comparable experiments and effects of refiner plate dam on coarse pulp properties is given. Plate dams offer a chance to utilize different alternatives needed to defibrate OPEFB and develop fiber in a more efficient way. From the experimental results, we also assume the possibility of a refining mechanism of defibration by friction of fiber to fiber interaction occurring mainly at the primary stage high consistency refining; the second stage is for fiber properties development by fibrillation at medium consistency. The effect of the undammed refiner plates is cutting more than fibrillation at high consistency, and fibrillation more than cutting at mid-consistency; The effect of the dammed plates is more friction than cutting at high consistency and more fiber fracture at medium consistency.
Effect of Neodymium Magnet Field on Operation of Inductive Watt-Hour Meters
Authors: Lu Yan , Hu Jie Jia
Published: September 2012

To the illegal stealing problem using strong magnets, the paper studied on the effect of neodymium magnet field on operation of single phase watt-hour meters. The experimental results show that the magnetic field of neodymium magnet increased braking torque of inductive watt-hour meters and caused the negative error, increased starting current， the instrument internal permanent magnet was magnetized, and anomalies of the permanent magnet degaussing can effectively detect electricity theft.
Finite Element Analysis on the Blanking of Metal Tubes
Authors: Jia Yan Ping , Hao Nan Hai
Published: September 2012

Tube blanking has application potential in bearing manufacturing. However, compared with sheet blank, tube balnking has been rarely studied yet. In order to achieve an intensive understanding of the mechanism of the tube blanking process, a finite element analysis has been carried out by using the commercial software package ANSYS. According to the special requirement of the tube blanking, the major process attributes, such as punch-die clearance, edge radii of tools and contact between tool/workpiece have been taken into account in the finite element model. The tube material is 20 mild carbon steel and dimensions are 42.2 mm in outer diameter and 5.3 mm in wall thickness. The distributions of the stress and the equivalent plastic strain have been computed for discussion. It has been realized that the stress status around the tool corners plays an important role in crack generation and growth, thus decides the blanking quality.
Correction of World Coordinate Error in the Three-Dimensional Laser Scanning System of Human Body
Authors: Li Xiao Jie , Ge Bao Zhen
Published: September 2012

This paper studies three-dimensional laser scanning system of human body, and make adjustments according to the world coordinate error correction based on the point cloud obtained. This paper also analyzed the cause and characteristics of three-dimensional laser scanning system’s world coordinates error, and established the world coordinate correction model on the condition that vertical column coordinate error is not included in the calibration plane and the error is minimum relative to other highly cross-section. With a standard rectangular timber as the scan objects, correction factor is fitted and the effectiveness of this method is proved through experiments in which point cloud’s world coordinate error is significantly reduced.
Design of Intelligent AC Contactor
Authors: Li Xiao Bin
Published: September 2012

Aiming at the problem of high energy consuming and failure rate on traditional AC contactor, the implement method of intelligent AC contactor is presented. The smart structures concept is introduced into the domain of AC contactor and the microcontroller C8051F040 is used as the control core. The intelligent AC contactor is a comprehensive system which assembles data acquisition and control, fault self-diagnosis and protection Function, etc. DC operation and on-line monitoring of the running state is also realized. Experiments show that the system has characteristics of low cost , accurate indication for running state and fault location, good protecting function, completely eliminating the noise and vibration operation, good performance in energy-saving , etc.
Filtering of Electronic Speckle Correlation Fringes
Authors: Guo Fei , Zhao Mei , Fan Xiu Ying , Bao Jin He , Sun Wen Bang
Published: September 2012

Speckle correlation fringes include a large quantity of speckle noise. It is first to consider how to reduce speckle noise before using phase formula to calculate. Filter is usually used to reduce speckle noise. From two aspects of frequency domain and space domain, we adopted mean filter, medium filter, Butterworth low-pass filter and homomorphism filter to process the speckle correlation fringes obtained by experiment. It is shown that the speckle correlation fringes are clearer and more easily interpreted and automatic processed after being filtered.
The Fuzzy Self-Tuning PID Control for Boiler Drum Water Level
Authors: Zhang Yong Sheng , Zhao Shu Qin
Published: September 2012

In order to improve the control quality of water level for boiler drum, a fuzzy self-tuning PID level controller for boiler drum was designed based on the fuzzy logic principle. The fuzzy logic toolbox and Simulink module of Matlab software were used for the modeling of the water level control system of boiler drum. Numerical simulation was implemented. The result shows that the fuzzy self-tuning PID control has such virtues as smaller overshoot, shorter regulating time and stronger robustness than conventional three-element PID control. The fuzzy self-tuning PID control is especially effective for nonlinear system like boiler with multivariable, large time lagged and strong coupling. It is a very effective control method with widely application prospect.
Frequency Stabilization of the Diode Laser to the Extra Reference Cavity
Authors: Liu Xiao Dong , Lei Hai Dong , Zhang Jian Jun
Published: September 2012

The Semiconductor laser frequency stabilization is the important study topic because of its increasing popular. We introduce a simply experimental setup method of the frequency stabilization of a 780 nm diode laser by only a tiny current in the laser audio modulation, photodiode receiver, and locking the transmission peaks. Use this method, the laser can be locked to the resonance peak of the Fabry-Perot cavity. The linewidth of laser is below 400 kHz, and it runs continually above 3 hours.
Study on a Data Acquisition System for Logging while Drilling
Authors: Liu Sheng Hu , Xing Ya Min
Published: September 2012

This electronic Logging while drilling (LWD) is a new sort of well drilling technology developed in recent years. As to the traditional cable borehole survey, the LWD method has many advantages because of its higher accuracy, higher geologic strata resolution capacity, much less time and cost. To meet the current logging technology needs, A data acquisition and processing system for logging while drilling is designed．It minutely introduces the collection system structure, acquisition Program, the digital design of LWD and discusses the design and the implementation of each functional module．The system which designed on the basis of the high precise DSP and FPGA implements signal pretreatment, high speed A/D control and digitalization of the phase sensitive demodulation etc, optimizes the acquisition and processing system and supplies a new way for the development of logging while drilling．Experimental results show that system performance has attained the design requirement.
Study for Interrupt Controller S3C2410X of Embedded System
Authors: Tu Yu , Zhao Yan Ping
Published: September 2012

Interrupt handling in out-of-order execution processors requires complex hardware schemes to maintain the sequential state. By managing the interaction with external systems through effective use of interrupts can dramatically improve system efficiency and the use of processing resources. The actual process of determining a good handling method can be complicated, challenging and fun. Numerous actions are occurring simultaneously at a single point and these actions have to be handled fast and efficiently. The paper will provide a practical guide to designing an interrupt handler and discuss the various trade-offs between the different methods. The interrupt handling process of S3C2410X is described, normally, S3C2410X interrupt controller requests interrupt from kernel interrupt FIQ or IRQ of S3C2410X after the interrupt arbitration. The experiment purpose and experiment equipment is detailed listed. Finally, the author explored into the experiment principle and experiment procedure.
A Study on a New Method for Measuring Positioning Accuracy of Multi-Station Turntable
Authors: Han Liang , Zhang Li Yang , Wu Wei Zhong , Hao Cheng
Published: September 2012

Multi-station turntable, widely used in industrial automation field, has become an indispensable device in the automation assembly line. The positioning accuracy of traditional mechanical turntable is largely affected by the machining accuracy of Geneva wheel, Ratchet and Cam. The positioning accuracy level has a crucial influence on processing and assembly accuracy, and production efficiency. This paper presents a measuring method to measure positioning accuracy by eddy current sensor. To achieve the positioning accuracy the writer measures the distance between the probe and the measuring block in the circumferential tangent direction. When the turntable turns to a station, the sensor probe is manually adjusted to align it with the measuring block. In this way, the positioning accuracy can be measured conveniently and directly.
Research on Multi-Point Calibration and Touch Pressure of Touch-Screen
Authors: Jiang Xiu Hong , Duan Fu Hai , Guo Rui
Published: September 2012

In view of the inaccuracy and low sensitivity of resistive touch-screen in small point target environment, two measures were proposed. First, based on the existing three-point calibration algorithm, more points were sampled to improve coordinate conversion precision, greedy algorithmm reduced the random calibration point set, and least squares algorithm fit the final calibration coefficients. Another measure was to utilize the touch pressure measurement and pressure threshold decision to remove invalid click. Finally, test results show that multi-point calibration with greedy algorithm can improve the precision of coordinate calibration, and the adoption of pressure decision can effectively enhance the system’s adaptability to touch intensity.
Design of Measuring System of Sewage in Pipeline
Authors: Shi Bing , Ma Zheng Hua , Jiang Jian Ming
Published: September 2012

For improving monitoring the sewage in pipeline, and improving the accuracy of the transmission in network, the remote monitoring system based on wireless sensor network and GPRS is designed. The test show that communications among the system are realized reliably and the requirements are met respectively. The application of the system can well meet the demands of remote monitoring system for sewage in pipeline.
Pitch Detection Based on Recursive Analysis
Authors: Wang Jing Fang
Published: September 2012

In this paper, a new method of the recurrence analysis pitch detection of nonlinear dynamical characteristics for speech signals is designed，which calculated firstly the pitch by recurrence quantification，and then distinguished accurately voiced/unvoiced by the product of the recurrence degree and the pitch, and modified the fluctuating pitch. The results show that the new method performance is better than the conventional autocorrelation algorithm and cepstrum method，especially in the part that the surd and the sonant are not evident, and get a high robustness in noisy environment.
The Face Detection Research Based on Multi-Scale and Rectangle Feature
Authors: Liu Hong Hai , Hou Xiang Hua
Published: September 2012

When extracting the face image features based on pixel distribution in face image, there always exist large amount of calculation and high dimensions of feature sector generated after feature extraction. This paper puts forward a feature extraction method based on prior knowledge of face and Haar feature. Firstly, the Haar feature expressions of face images are classified and the face features are decomposed into edge feature, line feature and center-surround feature, which are further concluded into the expressions of two rectangles, three rectangles and four rectangles. In addition, each rectangle varies in size. However, for face image combination, there exist too much redundancy and large calculation amount in this kind of expression. In order to solve the problem of large amount of calculation, the integral image is adopted to speed up the rectangle feature calculation. In addition, the thought based on classified trainer is adopted to reduce the redundancy expression. The results show that using face image of Haar feature expression can improve the speed and efficiency of recognition.
Toeplitz Robust Noisy Speech Endpoint Detection
Authors: Wang Jing Fang
Published: September 2012

In this paper, under the conditions of low SNR speech endpoint detection, a feature based on the maximum value of Toeplitz Noise endpoint detection methods. Terms of the method of spectrum from the corresponding sequences with a symmetric Toeplitz matrix constructed using the maximum eigenvalue of the matrix information on the voice signal for dual endpoint detection threshold. New algorithm has been tested to effectively distinguish between speech and noise, low-noise in different environmental conditions has good robustness. With the recent recursive signal analysis methods, the accuracy is higher. The algorithm to calculate the cost of a small, real good, simple and easy to implement.
Chinese Characters Knapsack Public Key Encryption Algorithm Research
Authors: Wang Jun Feng , Wang Shan , Liu Yu Hong
Published: September 2012

The double-byte character asymmetric encryption is always the difficult problem in information encryption technology, to choose algorithm not only depends on encryption information safety, but also considering the processing speed of plus and encryption information as well the system implementation of software and hardware. Depend on the large integer factor decomposition and the lower operation speed in public key system to discrete logarithm. The article proposes based on the processing algorithm of knapsack public key of Chinese characters plus and encryption information, introduces the password thought and decryption principle of Merke-Hellman knapsack algorithm, describes the experimental verification of the encryption algorithm to Chinese character.
Structural Join Algorithm of XML Query Based on Exhaustive Dynamic Programming
Authors: Zhang Xue Min , Chen Xiao Wen , Jiao Jia Lin
Published: September 2012

Using the advantages of exhaustive dynamic programming algorithm, on the basic ideas of the global optimal solution is derived based on local optimal solution, this paper propose a new structural selection join algorithm. The algorithm connects to the sub-tree, and then connects to the structure of the whole. Though not guaranteed optimal solution, this algorithm can improve much in the time complexity, reduce the search space and improve efficiency.
The Application of Mutual Information Attribute Reduction in Extracting Feature Index of Sport Injury
Authors: Jiang Li Yan , Zhong Ya Ping , Wu Qing Jian
Published: September 2012

The sports injury is common in training, hindered the athletes to further improve the sports results. There are many factors in sports injury, How to accurately identify the core, the key factors, is the question needs to be solved in the sport and the medical. The paper fully aware of the advantages of the attribute reduction, putting forward an attribute reduction algorithm based on mutual information, by introducing the concept of information theory, and proving it’s reliability.
Translational Tracking Algorithm with Pen-Based MEMS Device
Authors: Zhang Yu Xiang , Li Hua Cheng , Ma Liu Yi
Published: September 2012

According to the limited accuracy of the current MEMS inertial sensors, the motion displacement method obtained by direct acceleration of the second integration to will bring large errors, this paper presents an motion tracking solution method for tracking three-dimensional arm movement ,by changing three-dimensional arm motion into the translational tracking of the plane, complementary filter for multi-sensor data fusion for data integration and correction is designed and the translational tracking method is introduced detailed, The experimental results show that the proposed method can improve tracking accuracy and stability in arm writing motion without noticeable drift.
Fractionally Spaced Frequency Equalization Method for Orthogonal Frequency Division Multiplexing (OFDM) Jointing with Modified Pilot Sequences
Authors: Guo Ye Cai , Chen Qu , Guo Jun , Miao Xiao Li
Published: September 2012

In order to obtain accurate and high-speed data transmission, the orthogonal frequency division multiplexing(OFDM) technology is introduced and it is a kind of a multi-carriers modulation technology with high efficiency in the use of frequency band and characteristics of strong anti-interference ability. The fractionally spaced OFDM frequency domain equalization algorithm based on modified pilot sequences is proposed. In this proposed algorithm, one-dimensional linear interpolation method is used to estimate the frequency domain response of all subcarriers by part of the subcarriers’ frequency domain response with reducing the number of transmitted pilot sequences, and received signals are oversampled to acquire more detailed channel information. The computer simulations in underwater acoustic channel show that the performance of proposed method outperforms the single-carrier system and traditional OFDM system.
A Novel Spatial Modulation Scheme for MIMO System
Authors: Zhang Yao Yuan , Zhang Zi Sheng , Lian Ya Fei , Ding Qian
Published: September 2012

A novel spatial modulation scheme based on Space-Shift Keying (SSK) modulation is introduced for MIMO system. The proposed scheme doubles the spectrum efficiency of SSK by assigning unique symbols to different combinations of antenna indexes per symbol duration, while retaining the SSK’s inherent advantages. The optimal detector is utilized at the receiver simultaneously. Analytical and simulation results show: 1) in Rayleigh fading channel scenario，the obtained gains in SNR for the same spectral efficiency of the proposed scheme over amplitude/phase modulation (APM), vertical Bell Labs layered structure (V-BLAST) and spatial modulation (SM) systems are obvious; 2) under the correlated channel assumption, the new one still outperforms SM and V-BLAST clearly, which indicates the new one is more robust in the presence of channel correlation.
Collusion-Resistant Spectrum Allocation Based on Pricing Game and Multi-Stage Auction
Authors: Tian Ye , Ma Lin , Tan Xue Zhi
Published: September 2012

With the urgent needs of improving spectrum’s efficiency, dynamic spectrum allocation based on auction has become a popular method, which makes unlicensed users to use the vacant spectrum released by primary users. However, the collusion behavior between unlicensed users harms system’s efficiency and profit. Although many kinds of mechanism have been proposed to solve this problem, resisting collusion is still a tough problem. In this paper, we study the nature of collusion behavior and revenue, and model a multi-stage auction for centralized spectrum allocation. In order to balance the collusion-resistance and revenue-optimization, we propose an algorithm with unit price priority and one step revenue optimization, which can combat collusion between unlicensed users and encourage them to compete with each other so that improve system’s total profit to some degree. With the simulation results, our algorithm shows a good performance on collusion-resistance and system’s revenue comparing with the other two algorithms.
Rate Compatible LDPC Codes Design for Shallow Water Acoustic Communications
Authors: Chen You Gan , Xu Xiao Mei , Zhang Lan
Published: September 2012

The fast temporal variations shallow water acoustic (SWA) channels need the temporal variations channel coding scheme at the acceptable cost. Hence, flexible channel coding rate, adjusted according to different ocean channel characteristics, should be desired in the design of practical error control SWA communication system. In this paper, we propose rate-compatible LDPC (RC-LDPC) codes to improve the communication system reliability for SWA communications. The proposed SWA system adopting RC-LDPC codes consists of three important preprocessing: channel state information (CSI) estimator, signal-to-noise ratio (SNR) estimator and RC-LDPC pattern. For the estimation error, we define and derive the sensitivity to imperfect CSI and imperfect SNR. Then the design of RC-LDPC codes and SWA channel profile are described. Furthermore, the RC-LDPC performance pattern is given and sensitivity to estimation error of CSI and SNR are analyzed via simulation. It is shown that RC-LDPC codes have good performances with wide range of rates in SWA channels. Finally, coding rate distributions of RC-LDPC codes in different SNR at BER below 10-4 for SWA channel are investigated.
Study on the Steady State Thermal Analysis Method of Accessory Transmission System
Authors: Shi Yan Yan , Li Lin , Kong Xiang Feng , Li Jin Hua , Sun Hong
Published: September 2012

The mathematical model of steady state thermal analysis of accessory transmission system is built according to heat transfer theory, the governing equation functional of the steady state temperature field of accessory transmission system is derived on the basis of the variation principle, and the method to calculate the steady state temperature field of accessory transmission system is proposed with the finite element software ANSYS and its secondary switching language APDL. The result shows that the prediction of temperature field fit in with the heat flow law, then the correctness and validity of the proposed thermal analysis method is verified.
An Model and Solution of Communication System for High Altitude Platforms
Authors: Guo Wen Tao , Guo Dao Sheng , Li Xiang , Wei Zhi Hu
Published: September 2012

This paper contains a review of technologies, theoretical studies for optical communications from and to high-altitude platforms (HAPs). We discuss how to use optical communication to transmit data at multi-Gigabits in HAP to HAP and HAP to Satellite. The influence of the atmosphere, background light and other noise are discussed in this paper, we explain the advantages and disadvantages of free-space optical communications. And the performance of HAPs (High Altitudes Platforms) WiMAX is studied for different HAPs heighth and transmitted power level in different transmission format. The coverage radius increases with the transmitted power increment and with the operating frequency reduction
The Synchronous Measurement System of Physical Flied of the Ocean Environment Based on Virtual Instrument and Ethernet
Authors: Liu Yue Lei
Published: September 2012

In order to acquire the multi-points physical signature of the ocean environment,a distributed measurement system was designed. Because of using virual instrument and ethemet technology, the system can measure the multi-points physical signature synchronously.The hardware part of the system contains measurement nodes, central electrical cabinet and measurement stations.The soft part which modular and open design method is used in is based on LABVIEW developing workbench,achieving the automatic physical measurement , real time display,data processing and management.. The experiment results prove the system effective.
A Novel Bandpass Filter Using Asymmetric Open Stub-Loaded SIRs
Authors: Liu Guo Gao , Tian Li
Published: September 2012

A novel microstrip bandpass filter using stepped impedance resonators (SIRs) with asymmetric open stub-loaded is proposed in this paper. The filter uses asymmetric open stubs as capacitive loads, resulting in higher-order spurious frequencies suppression and wider upper stopband. Compared with the traditional filter based on stepped impedance resonators at the same design frequency of 2.4 GHz, the proposed filter can significantly reduce the circuit size of 45 %. By changing the geometric dimensions of the asymmetric open stub-loaded SIRs, which can achieve single-band bandpass filter at the centre frequency of 3.5 GHz and dual-band bandpass filter at the centre frequency of 2.4/3.5 GHz.
Effects of Ca on Mechanical Properties of Magnesium Alloy AZ81
Authors: Chen Zhi , Li Quan An , Liu Wen Jian , Song Xiao Jie
Published: September 2012

The microstructure and mechanical properties of aged AZ81 magnesium alloy with Ca addition have been investigated. The results show that with proper content of Ca addition, the microstructure of AZ81 magnesium alloy is refined. Meanwhile, high melting point granular compounds Al4Ca are formed, and the quantity of β-Mg17Al12phase is reduced significantly. And the mechanical properties of AZ81 magnesium alloy are enhanced at room temperature and 150°C.
Applying the Internet of Things into Ecological Environmental Monitoring
Authors: Zhou Guo Ping , Chen Ya Nan
Published: September 2012

Applying the Internet of Things (IOT) into ecological environmental monitoring is the goal of this paper. There are several advantages of the Internet of Things (IOT) applying in ecological environment monitoring. A hierarchical monitoring system is presented, including system architecture, hardware/software design, information flow and software implementation. In the end, using carbon dioxide gas in the atmosphere for experimental purposes, in data collection and analysis. Experiments showed that this system is capable of monitoring ecologica environment, which orientate the future research of forest ecosystem.
Pilots Updating Channel Compensation Base on Underwater MIMO-OFDM
Authors: Sun Zong Xin , Wang Wei , Wang Yue , Khan Rehan , Qiao Gang
Published: September 2012

The communication rate is limited extremely by the confined bandwidth source of UWA (underwater acoustic) channel. MIMO (Multiple-input Multiple-output) techniques can drastically improve the spectral efficiency, and have been a new hot spot in UWA commutation. To estimate the UWA channel STBC (space-time block code) technique is adopted, and the improved method of channel estimating is also given. A designed of complex coding MIMO-OFDM is provided.The validity and the dependability of the scheme are verified by Monte Carlo simulations.
Reliability Models of GSM-R Redundant Network on High-Speed Railway
Authors: Lin Jun Ting , Dang Jian Wu
Published: September 2012

As a dedicated digital mobile communication system designed for railway application, GSM-R must provide reliable bidirectional channel for transmitting security data between trackside equipments and on-train computer on high-speed railways. To ensure the safety of running trains, redundant network architecture is commonly used to guarantee the reliability of GSM-R. Because of the rigid demands of railway security, it is important to build reliability mathematical models, predict the network reliability and select a suitable one. Two common GSM-R wireless architectures, co-sited double layers network and intercross single layer network, are modeled and contrasted in this paper. By calculating the reliabilities of each reliable model, it is clear that more redundant the architecture is, more reliable the system will be, the whole system will bear a less failure time per year as the benefit. Meanwhile, as the redundancy of GSM-R system raises, its equipment and maintenance will cost much, but the reliability raise gently. From the standpoint of transmission system interruption and network equipment failure, the reliability of co-sited double layer network architecture is higher than the intercross single layer one, while the viability and cost of the intercross redundant network is better than co-sited one in natural disasters such as flood and lightning. Taking fully into account reliability, viability and cost, we suggest that intercross redundant network should be chosen on high-speed railway.
Research on Influence of Aerodynamic Force on the Aerodynamic Heat for the Hypersonic Vehicle
Authors: Zhang Yu Xiang , Xu Jin Biao , Xu Fu Hou , Li Hua Cheng
Published: September 2012

During the flight of the hypersonic Vehicle, the angle of attack will change with the flight attitude. At the same time, the aerodynamic forces from the surface of aircraft will also be changing. The pressure and friction force are the main causes of the aerodynamic heating, so the surface aerodynamic heating will change. By used the method of numerical calculation, the passage studied the influence the change the pressure and friction force on the distribution of heat flux in different angle of attack and the relationship between the change of the force of lift-drag and aerodynamic heating. The research suggested that the distribution of the heat flux had very good consistency with that of pressure and friction. The lift change was the dominant factors influence of pneumatic thermal change; the change of drag force affected only the speed of heat flux change.
Effects of Ca on Microstructure and Mechanical Properties of Mg-5.5Al-1.2Y Alloy
Authors: Liu Wen Jian , Li Quan An , Chen Zhi , Song Xiao Jie
Published: September 2012

The microstructure and mechanical properties of aged Mg-5.5Al-1.2Y magnesium alloy with Ca addition are investigated. The results show that with 1.0wt.% Ca addition, the phase of Al2Y is refined obviously and the phase of Mg17Al12has a dramatic decrease in number. And, high melting point intermetallic compounds Al2Ca and Al4Ca are formed. Meanwhile, the β-Mg17Al12phase become more dispersed. After 1.0wt.% Ca addition, the mechanical properties of the alloy at room and elevated temperature are improved.
Remote Sensing Image Enhancement Based on Wavelet Transformation
Authors: Zhao Ying , Guo Ye Cai
Published: September 2012

The contrast of remote sensing images is very low, which include various noises. In order to make full used of remote sensing image information extraction and processing, the original image should have to be enhanced. In this paper the enhancement algorithm based on the biothogonal wavelet transform is proposed. Firstly, we have to eliminate the beforehand noise, and then take advantage of the non-linear wavelet transform to enhanced low-frequency and high- frequency coefficient respectively. Finally, the new picture is reconstruct by the transformed low-frequency and high-frequency coefficient. The efficiency of the proposed algorithm was proved by the theoretical analysis and computer simulations.
Hybrid Color Image Compression Using Discrete Cosine Transform and Discrete Wavelet Transform
Authors: Tang Ling , Chen Ming Ju , Song Hong
Published: September 2012

In this research we undertake a study of image compression based on the discrete cosine transform(DCT) and discrete wavelet transform(DWT). Then a hybrid color image compression algorithm based on DCT and DWT is proposed. This algorithm is implemented through transform the color image using DWT in the YCbCr space first, and then DCT in the low frequency, adopt huffman coding, RLE and arithmetic coding in the encoded mode. In experiments, the results outperform the only DCT and the only DWT typically higher in peak signal-to-noise ratio and have better visual quality.
Coating Process Investigation of DLC Coating Spinning Rings
Authors: Zou Qing Hua , Yang Bing
Published: September 2012

with DLC coating spinning rings as the subject, focuses on the mechanism of damage on spinning ring track caused by textile fiber fabrics adhering to spinning ring surface and relevant adhesive wear and fatigue wear. Aiming at its failure, single DLC coating is substituted by Ti-DLC coating spinning rings. The process after improvement adopts unbalanced closed magnetron sputtering ion plating and Ti-doping multi-layer composite coating technology to prepare Ti-DLC composite film on the surface of spinning rings under the condition of basic temperature below 100°C. As indicated by the study on the impact of different Ti contents on friction and were performance of the film, improved Ti-DLC coating spinning rings are superior to DLC coating spinning rings in terms of deposition rate, adhesion, hardness, wear resistance, friction coefficient and wear rate, ensuring better adhesion resistance and fatigue resistance.
Study on Computer-Assisted Audit and its Applications
Authors: Wang Feng , Zhi Wei Mei , Yang Long Ju , Wang Yan Yan
Published: September 2012

With the widespread use of information systems, traditional manual audit approach cannot adapt to the quick development of information technologies. It has drawbacks of high cost, inefficiency, big risk, poor quality, etc. Computer-assisted audit and its applications are studied in this paper. Firstly, comparative analysis between traditional manual audit and computer-assisted audit is conducted. Then the flow of data-oriented computer-assisted audit is presented and the implementation steps are detailed. Finally, the applications of computer-assisted audit are discussed in four practical audit cases of information systems, i.e. hospital information system, electrical police management system, local taxation management information system and medical insurance fund management information system. And the corresponding audit results are given. The practical audit cases show that computer-assisted audit can expand the audit scope and perform deeper data analysis, thus cutting down the cost and risk of audit while improving efficiency and quality of audit. Therefore, it can effectively help auditors to perform information systems audit.