bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulation of Three-Phase Voltage Rectifier Based on Voltage Space-Vector Method
Authors: Wang Xu , Xing Yan , Yang Dan
Published: June 2012

The mathematical model in the two-phase synchronous rotating coordinate system of three-phase voltage PWM rectifier is set up. A novel and fast algorithm of Space Vector Pulse Modulation (SVPWM) for three- phase voltage rectifier is adopted in this paper. The MATLAB/SIMULINK simulation model is presented based on the mathematical model of PWM rectifier. The simulation results illustrate that this design scheme has some value for practical due to its merits of pollution-free, power factor regulation and bin-directional power flow.
Intelligent Tracking Assistance System Based on GPS and GSM
Authors: Lai Zhi Qiang , He Cui Qun , Liu Guo Dong , Yao Mu
Published: June 2012

In recent years, GPS (Global Positioning System) developed rapidly, and widely used in car navigation, logistics, monitoring and other fields. However, intelligent tracking assistance for the old is relatively backward in the application. With GSM (Global System for Mobile Communications) and the QT cross-platform development tool, we design an intelligent tracking and assistance system. The system consists of the user and the terminals. The user can track the old, while the terminal can send alarm messages to the user when the old press the alarm button. We design and implement the display, alarm, help and query functions. Also, the system has good portability and scalability.
Study on Intelligent Obstacle Avoidance and Autonomous Navigation
Authors: Cao Meng Long , Sun Li Na
Published: June 2012

Precise navigation and localization of the autonomous rover in unknown environment is important both for its own safety as well as for its ability to accomplish engineering and scientific objectives. In order to navigation autonomously the rover should have the ability of apperceiving the environment and avoiding the obstacles. Laser range finder is used to rebuild the environment and fuzzy reasoning method is used to avoid obstacles. Most importantly the rover process the sensor data to produce an estimate of its position while concurrently building a map of the environment. The improved filter algorithm is proposed to make the method feasible.
Video Based Visual Speech Feature Model Construction
Authors: Jia Xi Bin , Zheng Mei Xia
Published: June 2012

This paper aims to give a solutions for the construction of chinese visual speech feature model based on HMM. We propose and discuss three kind representation model of the visual speech which are lip geometrical features, lip motion features and lip texture features. The model combines the advantages of the local LBP and global DCT texture information together, which shows better performance than the single feature. Equally the model combines the advantages of the local LBP and geometrical information together is better than single feature. By computing the recognition rate of the visemes from the model, the paper shows the HMM which describing the dynamic of speech, coupled with the combined feature for describing the global and local texture is the best model.
Control System Design and Research of Parallel Ship Motion Simulator
Authors: Li Bin Cheng , Lv Feng , Li Xiao Fan
Published: June 2012

According to the design complexity due to the diversification of ship motion simulator structure and control system, we put forward that combining Stewart parallel structure based on modular design with open control system based on EMC2 controller. The system utilizes PC based on the hardware structure such as motion control interface card, servo electric cylinder and software structure such as real-time operation system UBUNTU and professional control software EMC2 which can ensure the system’s being real-time. We have studied the movement law of ship in waves and obtained the ship movement sample changing with time in waves. And we do the ship motion simulation well with the motion simulator system.
An Intelligent Monitoring System Using a ZigBee-Base Sensor Network
Authors: Lu Kun Yung
Published: June 2012

This paper presents an intelligent monitoring system based on a ZigBee-base wireless sensor network. The proposed system includes a sensor network configuration module, an expert system shell, and an event-condition-action (ECA) engine. The sensor network configuration module is used to configure the working properties of the ZigBee components and set up the monitoring network. The expert system shell enables users to define the related events occurred at system running, the threshold of working conditions for triggering the corresponding events, and the required commands for fitting the system. The ECA engine is used to monitor the system and provide a suitable command for system fitting in a specified event being fired. The proposed system enables user to quickly establish a wireless sensor network system without well-experienced knowledge about the wireless sensor network and the expert system.
Location of Time-Harmonic Magnetic Dipole
Authors: Liu Zhong Le , Zhang Yi Chao , Zhou Hao
Published: June 2012

This paper introduces a novel GA-based algorithm for location of moving time-harmonic magnetic dipole. Based on the function of propagation of underwater electromagnetic wave, the new location method with the amplitude of the electromagnetic wave picked out from receiving signals is proposed. According to the overall search ability of the genetic algorithm, the passive location of the radiant point about the time-harmonic dipole was achieved by the using of characteristic quantity of the amplitude. The result of the simulation validated that: within the underwater measurement distance, higher precision of passive location can be achieved by using the method based on genetic algorithm.
The Output Predictive Control of Optimal Reference Path Based on Fuzzy Inference
Authors: Zhou Tan Sheng , Dong Jian Jun
Published: June 2012

In the system of terrain following, after planning the optimal reference path, the key problem is the design of advanced path tracking system, there were many optimal path tracking schemes presented previously, but , they have the common characteristics of complicated arithmetic and tremendous calculating quantity, so, in the paper, for the sake of attaining simple and precise controller, adopting output predictive control to calculate control instructions and applying fuzzy inference to compensate the controlled quantity make fighter track the planned optimal reference path automatically, plenty of numeral simulation referring to various typical terrains shows that the scheme is feasible.
The Research of Frequency Characteristics of Tracking Differentiator
Authors: Meng Fei , Yang Jien , Yang Peng Song , Sun Biao
Published: June 2012

Function fhan() and tracking differentiator are important components of Active Disturbance Rejection Control Technique. It is pointed out that function fhan() is not the optimal control synthesis function of discrete system, but function fsun() is. Amplitude and phase frequency characteristic curves of tracking differentiators constructed respectively by function fhan() and fsun() are given by computer simulations. The account formula about turning frequency is also given. Influence of parameter variation on tracking differentiator frequency characteristic is analyszed. The conclusion of this paper is supplement and perfection for the theory of tracking differentiator in Active Disturbance Rejection Control Technique, and it can promote rapid development of Active Disturbance Rejection Control Technique.
Application of the Hilbert – Huang Transform for Machine Fault Diagnostics
Authors: Xuan Zhao Yan , Ge Miao
Published: June 2012

The vibration signals of the running machine contain non-stationary components. Usually, these non-stationary components contain abundant information on machine faults. In this paper, the Hilbert–Huang transform (HHT) method for the machine fault diagnosis is proposed. The empirical mode decomposition (EMD) method and Hilbert transform are key parts of the Hilbert–Huang transform method. The EMD will generate a collection of intrinsic mode functions (IMF). By applying EMD method and Hilbert transform to the vibration signal, we can get the Hilbert spectrum from which the faults in a running machine can be diagnosed and fault patterns can be identified. The practical vibration signals measured from roller machine with eccentric and friction faults are analysed by the Hilbert–Huang transform and Fourier transform in this paper. Finally, HHT’s performance in rolling machine fault detection is compared with that of the Fourier transform. The comparison results have shown that the HHT is superior than the Fourier transform in machine fault diagnostics. The different failure characteristic frequencies can be distinguished in the component of different orders of IMF, and the time and frequency of failure characteristic frequency appearance can be clearly reflected in the Hilbert spectrum.
Effect of Ball Milling on Powder Preparation by Mechanical Methods
Authors: Li Bin , Wang Hong
Published: June 2012

In the milling process, the particles experience mechanical stresses at their contact points due to compression, impact, or shear with the mill medium or with other particles. The rate of grinding depends on a number of factors, including the mill parameters, the properties of the grinding media, and the properties of the particles to be ground. SEM photomicrographs show that the mean sizes of final refined powders are about 200–400 nm, and are quite uniformly distributed by wet ball milling, so the quasi-nano powders are very suitable for sintering.
Production of V(C,N) Reinforced Iron Matrix Composites
Authors: Zhu Cheng Hua
Published: June 2012

The present work reported the preparation of V(C,N)-reinforced iron matrix composite via in situ synthesis. The phases and morphologies of the sintered composite were investigated using X-ray diffraction (XRD) and scanning electron microscopy(SEM). Dry sliding wear test had been carried out to study the wear behavior of V(C,N)-reinforced iron matrix composite. The results show that a uniform distribution of the V(C,N) reinforcing phase throughout the iron matrix is successfully obtained. Compared with hardened 45 steel, the wear resistance of the V(C,N)-reinforced composite is better
Flexural Analysis of Simply Supported Concrete Beam Reinforced with FRP Bars
Authors: Qu Hong Chang , Chen Ling Ling , Zhang Sheng Li
Published: June 2012

The purpose of this paper is to experimentally and theoretically study the flexural behavior of concrete beams reinforced with fiber reinforced polymer (FRP) bars. In this research, two series of concrete beams reinforced with GFRP and CFRP were tested up to failure. Beam stiffness was the same for all beams until the appearance of first cracks. Deflection at failure was identical for beams reinforced with GFRP and CFRP bars, but force at failure of CFRP reinforced beams bars was greater. The theoretical analysis for calculating deflections was carried out. The theoretical results were compared to the test results for the simply supported beam deflections, and the theoretical predictions agree well with the test results.
Structure Design and Comparison Analysis of Frame System with Angle-Steel Column and Prestressed Beam
Authors: Ji Jing , Yang Dan , Teng Zhen Chao , Ren Hong Guo
Published: June 2012

In combination with structure design of the JuLang farm activity center, a new frame structure which consists of angle-steel concrete composite column and prestressed concrete beam is adopted. Three kinds of schemes and the concrete design process are given, those are the well beam-shape structure, prestressed girder floor structure and prestressed beam and slab structure. Clear height indoor, material costs and time limit of three kinds of schemes are analyzed comparatively, the reason selecting prestressed girder structure system is given, these can provide reference for scheme selection and design of similar engineering.
Biomechanical Analysis of Two Techniques Performed in Table Tennis
Authors: Mao Bi Jian
Published: June 2012

Table tennis, as one of the most popular sports in China, has grown considerably since its developed in the 19th century in England. The biomechanics of the research methods in many sports has been widely used, for understanding of sports and technology and improve sports played an important role Fast break and curving ball technology is this game’s core technology. In this study, we based on fast break and curving ball features of kinematic to reveal the table tennis forehand techniques. Eight male volunteers were participated in this tests, the speed of the racket during the playing was recorded through Vicon Motion Capture System. The action was divided into three major phases: back swing, attack and follow through. At the end of back swing stage, break and curl technologies, the speed parameter shows some differences. While the peak speed in ball contact frame, the speed of curling ball was significantly higher than the fast break. Further study could be carried out in detailing analysis at sub-stage of the action for integral considering.
Study on Mechanical Property and Displacement of Latticed Soil Nailing Support
Authors: Qiao Lan , Liu Li Kai , Wei Hai Tao , Li Yuan , Li Xi Wen
Published: June 2012

Latticed soil nailing support is a new type of revetment structure, which combined lattice support and soil nailing. It effectively improves the global stability of the foundation pit. Currently, the theoretical research about this supporting method is still not consummate. In this paper, on the basis of soil mechanics and code, the stability of latticed soil nailing support are analyzed by the theory of the retaining wall, soil nail and the model of supporting piles. Then calculate the displacement in the limit state by elastic fulcrum method and the instantaneous displacement by layer-wise summation method. The total displacement can be calculated by the combination of the two displacements above, which is between 3.38mm and 15.43mm and close to the measured data. Simulate excavation and supporting process of the pit by finite difference method, analyze the mechanical property and displacement of latticed soil nailing support. Thus the theory of the calculation method to this supporting model is obtained, offering a reference for the similar projects.
Bioelectrical Impedance Measurement Way Based on an Improved DPSD Algorithm
Authors: Diao Jie Tao , Xie Qi You , Li Miao , Liu Wen Li , Sun Zhao Lin
Published: June 2012

In Bioelectrical impedance measurement, the impedance accuracy is a very important parameter. With the analysis of general Digital Phase Sensitive Detection (DPSD) algorithm and its error, this paper presents an improved DPSD algorithm. In this method, it firstly decomposes the orthogonal signals which have passed through the networks, and then sums (minus) the relevant signals to get the parameters amplitude and phase. By this way, it can avoid errors caused by filtering operation in general DPSD algorithm. At last, the paper gives a simulation which can be hardware-based achieved. The result proves the effectiveness and feasibility of this improved method.
The Design and Implementation of High-Resolution Camera Driver Based on Windows CE6.0
Authors: Song Li Hua , Jian Yang , Xiao Ke
Published: June 2012

The camera module interface features of the embedded processor S3C6410 would be analyzed, then the method of connection with CMOS camera hardware would be introduced. Based on Windows CE6.0 operating system and DirectShow technology, the high-resolution camera driver has been developed. Some features and functions of the camera are validated, and the results indicate that the camera driver is with high reusability and high stability. The result of character recognition test is up to 99.6%, and this verifies the high effective resolution.
Study on Patrol Service Platform Settings and Scheduling Based on Genetic Algorithm
Authors: Liu Huai Hui , Qiao Hai Feng , Li Nai Peng , Yao Hong Bao
Published: June 2012

In order to achieve rapid ease and rescue incidents in regional emergency, dispatching police scientific and reasonable , putting forward the model of emergency police force allocation to set up patrol service platform. Based on graph theory construction of the topological structure of the original problem, we use genetic algorithm to solve the problem .Through the solving ,we can get the best setting scheme of patrol service platform, to meeting patrol police within the specified time to achieve the area of possible emergencies of any emergency in the situation that given the number of police. Under meeting the hypothesis conditions using MATLAB software combined with genetic algorithm, we can get the police force allocation scheme optimization finally. Therefore, based on the graph theory combination of genetic algorithm and construction of city road traffic emergency police force allocation model, we can realize the security forces rescue scheduling, further realize the scientific and efficient rescue.
A Class of New Interval-Valued Intuitionistic Fuzzy Distance Measures and their Applications in Discriminant Analysis
Authors: Zhao Hua , Ni Ming Fang , Liu Hai Feng
Published: June 2012

In this paper we develop a class of new distance measures for interval-valued intuitionistic fuzzy sets. Then we discuss some of the special cases of it by taking different parameters. Finally we apply them for discriminant analysis with interval-valued intuitionistic fuzzy information.
The Characteristic Radial Basis Meshless Method for Convection-Dominated Diffusion Equations
Authors: Qin Xin Qiang , Duan Xian Bao , Guo Wei
Published: June 2012

A characteristic radial basis meshless method (CRBM) is developed for numerically solving convection-dominated diffusion equations. This method is a truly meshless technique without mesh discretization, and it is numerically stable and more efficient than the characteristic finite element method (CFEM) as demonstrated by the provided numerical results for convection-dominated diffusion problems. Moreover, the existence and uniqueness of the solution to the method are proved.
Image Retrieval Based on Contour and Relevance Feedback
Authors: Lu Wei
Published: June 2012

In this paper an algorithm is proposed to retrieve images based on contour moment invariants of image and relevance feedback. Firstly, the contour of each query image is extracted and its contour moment invariant is computed. Then according to Euclid Distance between the query image and each image in the image database, the most similar images to the query image can be found. Finally, the relevance feedback algorithm based on support vector machine (SVM) is applied to improve retrieval precision. Experimental results show that the algorithm is more accurate and efficient to retrieve images with monotonous background and clear object and meet the invariance on shift, rotation and scale transform of objects.
New Hybrid Blind Equalization Algorithms
Authors: Liu Shun Lan , Wang Lin
Published: June 2012

A novel decision-directed Modified Constant Modulus Algorithm (DD-MCMA) was proposed firstly. Then a constellation matched error (CME) function was added to the cost function of DD-MCMA and CME-DD-MCMA algorithm was presented. Furthermore, we improve the CME-DD-MCMA by replacing the fixed step with variable step size, that is VSS-CME-DD-MCMA algorithm. The simulation results show that the proposed new blind equalization algorithms can tremendously accelerate the convergence speed and achieve lower residual inter-symbol interference (ISI) than MCMA, and among the three proposed algorithms, VSS-CME-DD-MCMA has the fastest convergence speed and the lowest residual ISI, but it has the largest computation complexity.
Extraction of Mountain Feature Line Based on 3D Laser Scanning
Authors: Wan Cheng Hui , Cheng Xiao Jun
Published: June 2012

This paper applies a Cut-and-Sew algorithm extracting feature line of the mountain based on laser 3D scanning. The mountain is cut at the direction of contour lines. Point cloud data of the cut surface fits curve that project the same plane. Feature points find the curve corresponding to match. Through the connection of feature points, then returning the 3D space to achieve feature line, and the establishment of the formation of the triangular feature line is reconstructed on the mountain.
Color Image Encryption Based on the Multiple-Order Discrete Fractional Cosine Transform and Chaos in YCbCr Space
Authors: Luo Xian Zhe , Zhou Nan Run , Zhao Qing Min , Wu Jian Hua
Published: June 2012

Based on the theory that a color image can be decomposed into three primary components and each one can be seen as a gray image, we propose a color image encryption method with multiple-order discrete fractional cosine transform (MODFrCT), which is a kind of encryption with the secrecy of pixel value and pixel position simultaneously. The complex number mode that has a real part and an imaginary one is used in this encryption method to save the transmission channel. Human vision is more sensitive to the Y component than to other two components in YCbCr color space and this color format is used for encrypting the color image. Chaos is introduced to scramble the image phases both in spatial and transformation domains. The numerical simulations demonstrate the validity and efficiency of this scheme and the robustness of the method against occlusion attack is examined.
Histogram Equalization Based on Rough Set
Authors: Yan Peng , Zhan Wu , Min-Zi Ou Yang
Published: June 2012

In digital image processing, classical histogram equalization produce the loss of image information the caused by gray level of the output image may be too much merged. This paper mainly based on the concepts of the set approximate, classification approximate measurement and importance in the rough set theory, divided the appropriate boundary of the set, proposed an improved histogram equalization method, thus effectively solved the problem, gave the experimental simulation confirmation.
Bioavailability of Methanobactin to Copper by Methylosinus trichosporium 3011
Authors: Zhang Shuai , Jiang Jia Liang , Chen Lin Lin , Xia Chun Gu , Xin Jia Ying
Published: June 2012

Methanobactin (mb) is a small, copper binding bioactive peptides produced by methanotrophs. The transition between two forms of methane monooxygenase (MMO) expressed by methanotrophs depends on the amount of copper available in the surrounding. In this paper, the bioavailability of copper(Ⅱ) in the presence of different chelating agents to a representative methanotroph, Methylosinus trichosporium 3011 is studied systematically according to the naphthalene oxidation assay. The result shows that purple naphthol diazo complex may be measured at A530, and along with the increase of the concentration of the copper(Ⅱ), eight kinds of chelating agents have effect on the activity of sMMO. The copper bioavailability has been assessed after the changes in sMMO activity is monitored, it means that copper(Ⅱ) can repress the expression of sMMO as well as reduce its activity. The affinity of mb excreted during growth was also measured and the chelate constants of the chelating agents to copper(Ⅱ) are compared. Based on these studies, strongly binding chelating agents (Log K > 16) added into the medium at a concentration of 20uM were able to reduce copper bioavailability.
Application of Different Algorithms to Predict the Faults and Fractures in Carbonate Formation
Authors: Zhang Yan Ping , Lü Xiu Xiang
Published: June 2012

The application of coherent cube and volume curvature algorithm to analyze and process the three-dimensional seismic data of Ordovician carbonate rocks in the Tazhong area of Tarim Basin, and to predict the faults and fractures development. After the comparison, coherent cube algorithm is fit for prediction of main faults development with the clear result in oilfield exploration stage , volume curvature algorithm is fit for prediction of faults and fractures development with the abundant information in oilfield development stage. Therefore, according to different purposes of exploration and development, different algorithms could be applied to prediction of faults and fractures. This would be useful to guide the oilfield exploration and development.
Fiberglass Reinforced Plastic Winding System Adaptive Controller Design
Authors: Xue Zeng Tao , Li Zheng
Published: June 2012

This paper mainly introduces the components of fiberglass reinforced plastic winding automatic control system. According to the model reference adaptive control principle, an algorithm of adaptive control and its gain adjustable controller are presented, which is very suitable for the position servo system control. The control algorithm is relatively simple, and not only has achieved fine effects on the control of fiberglass reinforced plastic winding machines, but also has accomplished with small errors following any given speed as proved in simulations. It is expected that this research can be helpful to the fiberglass reinforced plastic winding technology study and improvements with advanced control strategies.
F- Rough Information Fusion and its Feature Recognition
Authors: Qiu Jin Ming , Liu Chi Biao , Chen Xiu Qiong
Published: June 2012

Aiming at the problem of dynamic information system fusion, by using singular rough sets, this paper proposes concepts of F-rough information and its fusion, information relationship measurement, and property theorem for F-rough information relationship measurement. Based on these concepts, it puts forward F-rough information relationship algorithms, the threshold-error theorem of F-rough information fusion, and principles for F-rough information fusion recognition. At last the application of F-rough information fusion is given.
The Research of Image Registration Method Based on the Genetic Algorithm
Authors: Li Hua , Wu Di Xiao , Li Qing Min , Zhang Peng Ying , Wang Rui
Published: June 2012

This paper puts forward one image registration method based on the feature point of the contour, and Introducing the search method based on genetic algorithm .the method can deal with image morphing caused by translation, rotation and zooming change. This method is simple, convenient , feasible and good robustness, and is suitable for the aerial of satellite remote sensing, the plane and UUV underwater detection state information which are rich image for registration.
The Research on Object Recognition from Occluded Images
Authors: Li Hua , Li Qing Min , Zhang Peng Ying , Wang Rui
Published: June 2012

Based on the contour feature point and genetic algorithm, a m ethod of recogn izing occluded images using feature templet is proposed in this paper. The result computer simulation shows that this method is shift, rotation, and scacle invariant, it obtained satisfactory result when the occluded proportion is less 40%.
Research and Implementation of Malicious Code Behavior Analysis
Authors: Li Wei , Liu Peng , Chen Hao
Published: June 2012

Along with the rapidly development of network technology, viruses, Trojans and other malicious code is updating unprecedented quickly, which constantly threatening the collective as well as the personal information safety.Analysis of malware based on the code behavioral characteristics aims at telling whether the code is malicious or not, which can effectively solve the problem caused by Zero-Day attacks that traditional anti-virus technology can hardly prevent. This paper studies how to monitor and record the API calling sequence when a program is running, and how to get the eigenvectors of behavior by means of analyzing the calling sequence of sensitive APIs, which makes the behavior of malicious code can be tracked, and providing supports and theoretical basis for addressing the potential threat of malicious code.
Study on Network Load Balancing Algorithm Based on Server Cluster System
Authors: Lan Li , Qi Chu Huan
Published: June 2012

The utilization efficiency of system resources is a key issue for cluster system while load balance is an important tool to realize the efficient use of resources. Based on server cluster system, this paper puts forwards an improved self-adaptive algorithm for network load balancing. Simulation results show that the algorithm can improve the utilization efficiency of system resource and reduce the server’s response time so as to achieve the request of real time when dealing with tasks and high availability of system.
A Study of Mobile Node Localization Algorithm Based on Ranging MCL for WSN
Authors: Tang Wei Dong , Liu Bai , Zhang Chao Qun , Wu Jin Zhao
Published: June 2012

Node localization is one of the key technologies in wireless sensor network. This paper proposed an improved RBDMCL algorithm based on traditional MCL algorithm, which can reduce the sampling areas and improve the positioning accuracy by building a node motion model. Then concludes by simulation analysis and comparison that RBDMCL has higher positioning accuracy than MCL in the anchor node density and node velocity.
Calculation Analysis on Audio Frequency Compression Based on Wavelet Packet Decomposition
Authors: Zhang Kai Wen , Zhou Yan Ling , Hua Xiang Gang
Published: June 2012

This text have further discussed the audio frequency compression based on wavelet packet decomposition and optimize the choice of optimum wavelet packet and proposed a optimized self-adaptive wavelet packet decomposition and adopted zerotree coding based on psycho-acoustic model, which makes this system have a higher compression ratio than audio signal and can keep good real-time and objective recovery signal to noise ratio. Computer simulation test is made for the calculation proposed with Matlab,and this simulation test has proved the point that is mentioned in this text.
Trusted Bootstrap of Para-Virtualized Domain
Authors: Xing Bin , Han Zhen , Liu Ji Qiang , Chang Xiao Lin
Published: June 2012

Trusted Computing technique can be applied to alleviate the concerns for the security of virtual machines (VMs), accompanying the increase in the use of virtualization technology. This paper aims to provide for guest para-virtualized machine (GPVM) applications a complete trusted chain from the physical TPM in a flexible way. We propose a robust and fast method for measuring the integrity of the system booting files of a GPVM. This method integrated with the existing integrity measure software such as Trusted Grub and Integrity Measurement Architecture (IMA) can provide the complete trusted chain. Compared to the existing method of measuring the GPVM integrity, our method is very flexible and fast.
Investigation and Exploration of a New Indoor Air Filtration Material
Authors: Wu Li Wei , Luan Kun , Zhang Fa
Published: June 2012

In this paper, a new type indoor air filtration material was developed using three raw materials (wool, carbon fiber and activated carbon powder). Optimum fabrication parameters were adopted in needle-punched process to fabricate the air filtration material. The effect of carbon fiber, wool layer number and activated carbon powder content were analyzed in thermal stability test and formaldehyde removal test, and results showed the addition of carbon fiber enhance the thermal stability, and synergistic effect of wool and activated carbon powder played an essential role in formaldehyde sorption process.
Auto White Balance Algorithm in Digital Camera
Authors: Li Jie , Wang Xue Xiang , Liu Hao
Published: June 2012

Auto white balance (AWB) is an important function of digital camera. The purpose of white balance is to adjust the image to make it look like taken under standard light conditions. We present a new technique to detect the reference white point of image in this paper. This technique detects the white point of image by using dynamic threshold method, thus making it more flexible and more applicable compared to other algorithms. We test 50 images which were taken under different light sources, and find that this algorithm is better than or comparable to other algorithms both in subjective and objective aspects. At the same time, this algorithm has low complexity, and it can be easily applied to hardware implementation.
Study on Utility Maximization Effectiveness in Packet Network Coding
Authors: Guo Yang , Ji Yong Gang , Xu Jia
Published: June 2012

In this paper, the coding for multicast packet network call, the network utility maximiza- tion problem, when multicast call, given coding subgraph case modeling, Coded packet networks set up to maximize the effectiveness of modeling .Then use the duality theory, the distributed gradient projection algorithm that can solve the problem of modeling the network utility maximization
An Anti-Eavesdropping Network Coding Algorithm
Authors: Ji Yong Gang , Guo Yang , Xu Jia
Published: June 2012

This paper discusses the application of random network coding safety problems , when transfering files, and Puts forward an algorithm that targets eavesdropping adversaries By means of this algorithm,an eavesdropper is unable to get any meaningful information about the source,which we call weak security.We show that if we give up a small amount of over all capacity, then a random code achieves the weak security condition at a much higher probability. Besides, when there is a secret channel or apublic encryption scheme between the source and destination,an algorithm that not only achieves the max-flow but also the weak security condition is proposed.The probability of the coding scheme to be security is 1,when random codingscheme is used.
A Multi-Strategy Word Sense Disambiguation Method
Authors: Yu Lin Lin , Xu Deng Feng , Song Li Fang , Li Guo Jie , Song Xu Dong
Published: June 2012

Word sense disambiguation (WSD) is a critical and difficult issue in natural language processing(NLP), as well as WSD is great significance in large area of research areas of NLP. This paper presents a method of multi-word sense disambiguation strategy. The method combines the method based on match word corpus and the method based on the similarity and relevance very well. While the calculation of similarity and relevance are make full use of the sememe-tree information from HowNet. The experiments show that the proposed WSD method can obtain better results.
The Gray Processing of Moon Digital Orthophoto Map
Authors: Xu Wu Jian , Sheng Hao , Lou Chen , Zhao Hui Jie
Published: June 2012

Considering the mosaic result of the lunar DOM (Digital Orthophoto Map) produced by China's “CE-1” satellite, there usually exists a sharp gray jump beside the joining line. As to a strip image, the gray distribution may be uneven because of the light changing or position difference during photographing. To solve these matters, a method was proposed which is based on dynamic rules to detect the best joining line, and then stretch image according to its gray histogram. By making the pixels around boundary to change gradually, the joining line will finally be invisible. In order to solve the uneven gray distribution problems causing by imaging angle, light condition and other factors, a homogenization technology based on statistics of gray distribution was proposed. Using statistical information of the bands’ longitudinal changes to united the gray level to a defaulted range. The experimental results show that the method of this paper can make the integral gray level become even, the transition become more gently, and visual effect become more natural.
Effects of Macroscopic Pores on the Damping Behavior of Zn-Al Eutectoid Alloy
Authors: Wei J.N. , Chao X.B. , Huang T.C. , Yu L.S. , Zou J.S. , Xie W.J.
Published: June 2012

The objective of present work is to investigate the effect of macroscopic pores on the damping behavior of Zn-Al eutectoid alloy. The damping behavior of the foamed Zn-Al (FZA) eutectoid alloy prepared by air pressure infiltration process with macroscopic pores is characterized by internal friction (IF). Macroscopic pores size are on the order of a millimetre (0.51.0mm). The IF was measured on a multifunction internal friction apparatus (MFIFA) at frequencies of 0.5, 1.0 and 3.0 Hz over the temperature range of 25 to 400°C, while continuously heating temperature. The damping capacity of the FZA eutectoid alloy, with two different porosity and sizes of macroscopic pores, were compared with that of bulk Zn-Al eutectoid alloy specimen. The damping capacity of the materials is shown to increase with introducing macroscopic pores. Finally, the operative damping mechanisms in the FZA eutectoid alloy were discussed in light of IF measurements.
Synthesis and Thermal Energy Storage Characteristics of Hyperbranched Polyurethane as Novel Solid-Solid Phase Change Material
Authors: Hu Ji , Wang Wan Hui
Published: June 2012

A novel hyperbranched polyurethane solid-solid phase change heat storage material (HB-PUPCM) using hyperbranched polyester as chain extender was synthesized via a two-step process. Differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) were performed to investigate the phase transition behaviors and crystalline morphology. The results indicated that the HB-PUPCM was a good polymeric solid-solid phase change heat storage material.
Heterogeneous Preparation of Cellulose/Ag/Polyaniline Conductive Composite and its Electrical Property
Authors: Zhao Zhong Li , Mo Zun Li , Chen Zhong Yu
Published: June 2012

Cellulose/Ag/polyaniline conductive composite with rather excellent electrical conductivity was heterogeneously synthesized in this paper. The UV-Vis analysis indicated that homogeneous nanoAg particles deposited on the surface of cellulose in the form of globe particles. They offered some electrons to polyaniline chains. This behavior resulted to the facts that more polyaniline embedded on cellulose and an integrated electrically conductive network formed. Consequently, the high electrical conductivity of the composite was observed. The value was 3.48 S/cm, which was higher two magnitudes than the electrical conductivity of cellulose/polyaniline composite (2.15×10-2S/cm), and even was higher than the electrical conductivity of pure polyaniline (0.142 S/cm). This paper provided a facile method for the preparation of cellulose/Ag/ polyaniline composite with favorable electrical conductivity.
Study on Crystallization Behavior of Liquid Crystalline Polyacrylates Induced Isotactic Polypropylene
Authors: Chen Qian Yang
Published: June 2012

A series of polypropylene (PP) blends were obtained by blending isotactic PP and different mass fraction of liquid crystalline polyacylates (LCP-A) at a proper process program. The effect of LCP-A as a new nucleator on crystallization behacior of isotactic PP has been investigated with wide angle X-ray diffraction (WAXD), polarized optical microscopy (POM) and differential scanning calorimetry (DSC). The experimental results showed that LCP-A in the PP played a role in the heterogeneous nucleation effect, supplied much crystal nucleus, enhanced the crystallization velocity and temperature, and the spherulites became smaller and more homogeneous. Moreover, β-phase in the PP was induced. In addition, the relative content of β-crystal (Kβ) increased with increasing LCP-A content or crystallization temperature, reached a maximum value, and then decreased as the temperature or LCP-A content further increased. Kβ of PP with 0.8% LCP-A isothermally crystallized at 125°C for 1h was 21%. POM results that showed the morphology of β and α spherulite disappeared at 156°C and 172°C, respectively.
Study on Mechanical Properties of Wood Plastic Composites
Authors: Huang Fang
Published: June 2012

Composite material has many excellent properties, current, receives special attention was paid to its mechanical properties. By adding the dispersed phase can make the strength of the composites than did not join the dispersed phase of pure matrix material strength several times or several times. Composite materials are often called fiber ( or other dispersed phase) reinforced composite materials.
Microstructure of AM60 Magnesium Alloy by High-Pressure Solution and Subsequent Atmospheric-Pressure Aging Treatment
Authors: Duan Wen Yan
Published: June 2012

As-cast AM60 magnesium alloy was solid dissolved with exercising different pressures (atmospheric-pressure, 3, 4 and 5 Gpa) to it and subsequently aged under atmospheric pressure. The microstructure of the products was characterized by optical microscope and X-ray diffraction. The results show that, compared with exercising atmospheric-pressure during solution treatment, exercising high-pressure during this process causes that the α-Mg grains of the subsequent aging alloy are more fine and uniform, while the β-Mg17Al12 phases transform into fine particles and aggregate to form gobbets or strips. In addition, increasing the exercising pressure promotes the precipitation of the β-Mg17Al12 phases of the aging alloy.
Weigh-in-Motion Device Based on Capacitive Weighing Sensor
Authors: Chen Mei
Published: June 2012

A weigh-in-motion device is developed to solve defects in the current method. A vehicle carrying capacitive sensor is adopted as the load weighing component, and an embedded MCU is used as main control unit in this device. The device achieved real-time monitoring and displaying for static loads, transient loads and overloads of vehicle. An alarm is issued if vehicle is overloaded. The information of vehicle loads may be send to inspectors by wireless communication device. The test results show that the measurement error of this device is less than 10% and its precision is better than one class WIM system provided by ASTM E131-02.
Dynamic Bridge Piezoelectric Amplifiers with Signal Generator
Authors: Xin Hai Tao
Published: June 2012

Piezoelectric amplifier is a very important part of the piezoelectric actuator. Not only positioning accuracy, but also dynamic performance and power are demanded more and more highly. At present piezoelectric amplifier are mainly used in static applications, power and frequency response are usually incompatible. This paper developed a new type of piezoelectric amplifier to meet high demand for dynamic, which takes dual-power supply, bridge-output to achieved slew rate, power were doubled, and maintain a wide frequency range at the same time. Controller implements DDS unit through FPGA, which could achieve sine, triangle, square and sawtooth.
A SMS Based LED Electronic Display System
Authors: Huan Shi Yu
Published: June 2012

At present, the LED electronic display is widely applied in each kind of public area to announce all kinds of information. So it can make people feel facility, it can also expand the information audience.Display broadcast information needs regular replacement, and the methods are varied. In many cities,the present displays which are set up in the intersections of streets are quite scattered, and away from each others, so only the artificial update method is adopted. However, this approach relatively consumes more manpower and material resource. On the other hand it would cost much more time so that the information could not be broadcasted in time. A new idea of the information updating based on SMS (Short Messaging Service) is proposed in this paper. The GSM modems are all installed in controllers of the control center and the display terminals, and the GSM modems are controlled by the embedded software system to send and receive the message via AT commands. Therefore, the control center could send the updating information as SMS to all of display terminals in this way, and the terminals replace old information and broadcast the new information as soon as they received the news. This approach not only saves the manpower and the material resource, but also makes it possible to increase the information betimes.
The Research and Design of the Adaptive Pulse Demagnetizer
Authors: Wei Li Feng , Cheng Liang , Yang Xing Man
Published: June 2012

A adaptive control method of the pulse demagnetizer was presented, Can adjust the strength of the charge current automatically according to the changes of the magnetic content to ensure the constant of the magnetic field.The experimental results have shown that it has the advantages of low power consumption, strong anti-interference capability, stable and reliable operation, long life and good demagnetizing effect, when compared to the conventional demagnetizers.
A Fault Detection Method Based on BIT for Satellite Avionics
Authors: Jiang Lian Xiang , Xin Ming Rui , Cui Zhan Guo
Published: June 2012

Satellite avionics was introduced to gain mass reduction, lower cost, modular and standard equipment. Fault detection, isolation and recovery is one of the main way to upgrade the autonomy of satellites. Built-in-test is one of the most prevalent and effective fault detection method, according to the structure and characteristics of satellite avionics, the BIT of satellite avionics was designed and introduced.
Research on Spacecrafts Intelligent Power Distribution Technology
Authors: Cui Kai , Dong Zhong Bo , Li Bo
Published: June 2012

The development of all kinds of spacecrafts is much smaller and more intelligent, integration increased constantly, one satellite can accomplish more and more expectant missions by using plenty of loads. As a result, higher power, higher reliability and much smarter power distribution system is needed to satisfy the growing quantity of loads. This paper presents the power supply system which characterized by loads observation real time, software and hardware combinational over current protection, bus communication with on board computer, the system has been validated in project and the conclusion has been proved accuracy and reliability.
Protocol Conversion between PCI-Express and 1553B Bus
Authors: An Peng
Published: June 2012

1553B bus is designed for aircraft developed an information transmission device bus standard, which is an agreement between devices. PCI Express is built on the PCI standard technology. It has the advantages of fast transmissions and strong reliability, so it can serve as a 1553B bus data transmission interface. The 1553B bus protocol includes data link layer, physical layer, and functional analysis. In the system, large scaled FPGA chip is used as the core. In its internal hardware, there are integrated PCI Express physical layer, while the PCI Express and 1553B bus protocol layer all in the internal FPGA implementation, carried out through the DMA the exchange of data in order to improve system integration. System testing includes f real-time, reliability and fault tolerance. Test results show that the whole system is well suitable for 1553B in the PCI Express environment applications.
Realization of Multi-Channel, High-Speed Waveform Generator Based on FPGA
Authors: Nie Hong Shan , Liu Hu Sheng , Zhang Yu Mei , Xie Qi You , Liu Qiang , Diao Jie Tao , Xu Hui
Published: June 2012

This paper introduces the design and realization of a multi-channel high-speed waveform generator based on FPGA, Which consists of the high-speed clock generator, the high-speed high-precision digital to analog converter, multi-stage pipeline accumulator and high-speed small signal conditioning. At last, it gives some simulation. The results show that the output signal type of this waveform generator is rich, and the maximum output frequency is 80MHz. The waveform generator can be used in the fields which require multi-channel high-speed signal, such as phased array radar.
Background Extraction and Vehicle Detection Method Based on Histogram in YCbCr Color Space
Authors: Jin Cheng Jun , Chang Gui Ran , Cheng Wei , Jiang Hui Yan
Published: June 2012

In computer vision-based Intelligent Transportation Systems (ITS), one of the key techniques is to detect the vehicles accurately. In this paper, we propose a background extraction and vehicle detection method based on histogram in YCbCr color space. By using YCbCr color space, the influence of illumination change and shadows is reduced. To solve the problem with change in background itself, we propose a background update method by using the pixel change count and histogram. Experiment results show that the proposed algorithm can effectively extract and update the background information in complicated urban traffic environment. It also improves the accuracy of vehicle detection.