bluuebunny/crossref_metadata_2025 huggingface dataset:
The Time Synchronization Analytical Study of the Dynamical Multi-Agent
Authors: Ma Hong Jiao , Huang Fei Jiang , Zhang Biao , Li Meng
Published: September 2012

with the parallelism of task implementation, spatial distribution, well system fault tolerant capability and scalability, the multi-agent are widely used in many fields. The multi-agent synchronization control technology has been becoming a hot research at home and abroad. This paper set up unified time and frequency models of both homogenous and heterogeneous-agent, to explore the expression of multivariate time consistency problem. In addition, exploring the received signal strength (RSS) based time synchronization algorithm can enlarge the action range of multi-agent with keeping topologically connection, it also can ensure time synchronization and distance measurement when multi-agent lose satellite positioning function.
Research on PageRank Algorithm to Index Pages
Authors: Zhang He Ping , Zhao Ya Ping , Zhao Ya Li
Published: September 2012

PageRank algorithm is a vital method to determine the importance of pages. Useful as it is, the algorithm has many disadvantages. Therefore, we arrive at the conclusion that it’s not rational to calculate the importance degree of pages simply by links between them. Considering the timeliness problem of PageRank algorithm, we provide the time penalty factor W(n) to weigh the effects of update time on page ranking. After adding the time penalty factor to the original PageRank algorithm, we come up with the refined PageRank algorithm. Our algorithm is superior compared with the original one and many other existing methods that weigh the effects of update time. We judge update time by the times a page is crawled by Web crawlers. Consequently, drawbacks of the methods that use the real time to measure update time can be overcome and the order of pages can meet users’ need better.
Derivation of Major Factors of Beams Made of H-Sections for Fire Engineering Design
Authors: Kwon In Kyu
Published: September 2012

Structural steel has been used to make building structures higher and wider than that constructed with conventional structural materials such as concrete, brick, etc since 1960’s in Korea. But the steel structure has fatal demerits. One is the deteriation of structural performance when exposed to severe fire and the other is rusting. The structural behavior has to be sustained during unexpected fire and this can be done by fire design. The fire design consists of two methods. One is prescriptive and the other is performance-base fire engineering design. Recently, the fire engineering design has become a reasonable alternative against the prescriptive method in the world. But the fire engineering method is now preparing for adoption into Korea building regulation. The main purpose of this paper is to build the databases of fire resistant and limiting temperatures of beams made of H-section and the results from fire tests under loadings showed that the corelations between the limiting temperatures and load ratios applied were in reverse proportion.
Bee Genetic Algorithm Based on Immune Evolution and Chaotic Mutation
Authors: Li Zuo Yong , Zhang Zheng Jian , Wang Jia Yang , Zang Lei
Published: September 2012

In order to improve the optimized performance of bee genetic algorithm, this paper proposed the evolution strategy by introducing immune evolution and chaotic mutation into bee genetic algorithm. This algorithm carries out the chaotic mutation to the some individuals with the lower fitness values, meanwhile the crossover and mutation operations were conducted between the some individuals with the higher fitness values and the optimal individual (queen) in population. In addition, the optimal individual in each generation should make iterative calculation by immune evolution. Therefore, as the iterations go on, this algorithm not only converges faster, but also close to the global optimal solution with higher precision.
Research on J2ME Based Mobile Payment System
Authors: Zheng Chao Mei , Wang Yin , Li Yuan
Published: September 2012

Mobile payment is the most import part of mobile E-commerce. Currently there are many different types of technologies that can implement the mobile payment. J2ME is one of the best for its more popularity and convenience. The paper focuses on discussing the architecture of J2ME, and compare WAP and J2ME from various aspects, giving a general feasible J2ME-based design and overall framework of mobile payment system.
A Wide-Band Antenna Design by Using Electromagnetic Simulation Software
Authors: Ma Xing Bing , Zheng Hong Xing
Published: September 2012

A wide-band antenna coupling with an elliptical slot was discussed in this paper. To implement the wide band operation, an elliptical ring slot was etched on a polygonal patch. The properties of this design have been verified by using electromagnetic simulation software. Comparing to the conventional U-slot patch antenna fed by Π-shaped slot, the proposed structure is with the same impedance in bandwidth, but less than 10% in size.
Distributed Optical Fiber Raman Signal Noise Cancellation Based on Empirical Mode Decomposition
Authors: Zhong You Ping , Zhang Qi , Zhou Di
Published: September 2012

The distributed optical fiber Raman sensor system was widely used for real-time measurement temperature, but the Anti-Stokes and Stokes scattering Raman signal is very weak. In order to improve measurement accuracy the signal must be denoised before obtaining the temperature. In this paper, a new noise cancellation of empirical mode decomposition is proposed for enhancing signal-to-noise ration of the Anti-Stokes and Stokes scattering Raman signal. The signal-to-noise ratio was enhanced by using this method and it is easy to be realized in computer.
A Priority-Based Defragmentation Scheme in Flexible Bandwidth Optical Networks
Authors: Zhao Jie , Zhao Yong Li , Yu Xiao Song , Wang Xin Bo
Published: September 2012

Flexible Bandwidth Optical Networks(FBON) can improve spectrum usage rates comparing to traditional WDM networks, leaving one critical problem of spectrum fragments. This paper proposes a novel defragmentation scheme that determines the sequence of connections going through defragmentation processes. In sequencing connections, priority zones are divided and priority levels are set accordingly. Bandwidths or path lengths are what make a difference in a connection’s priority. As simulation results show, priority-based defragmentation scheme can achieve lower block rates as well as lower interruption rates. The simulation results also prove the preference of local defragmentation to global defragmentation and the preference of narrow-band defragmentation to broad-band defragmentation.
A New Approach of Time-Synchronization for LAN Based on General PC
Authors: Liu Ai Dong , Huang Bin , Zhang Yong Hui
Published: September 2012

Possessing a shrewd accurate time synchronous mechanism is the prerequisite of many network applications. This paper puts forward a kind of time synchronous method for LAN(local area network) based on general PC, replaces systematic clock with TSC(time stamp counter) register as synchronous time source, achieves synchronization through a client and server style, it is easy to calculate and needs less expense. The result of experiment shows that the synchronous precision of this method is higher, and can be kept longer; it also shows that this method is suitable for the application occasion which requires higher time-synchronization.
Modeling of Pulp Washing Process Based on Two-Step BP Neural Network
Authors: Wang Hua Zhong , Shan Wen Juan
Published: September 2012

The most important quality indexes to evaluate pulp washing performance are residual soda and the Baume degree. But it is difficult to measure the two indexes directly. To solve the problem of optimization control of the washing process, the model of the residual soda and the Baume degree are studied in this paper. Simulating residual soda and the Baume degree via a two-step neural network and modeling them based on least square method and steady-state data obtained by neural network model. Simulation results show that this method can effectively locate the pulp washing process.
A High Bandwidth Signal Generation System Based on FPGA
Authors: Lu Xu Guang , Tian Ji Hua , Han Xiao , Sun Jin Ping
Published: September 2012

A Wideband Signal Generation System for radar and Electronic Warfare is presented. This system uses two DACs each can work at 1Gsps with 14-bit resolution and generate 500MHz bandwidth signal. The DDWS (Direct digital wave synthesis) method is used for signal generation and the data transfer and controlling is based on FPGA. The data for signal generation is stored in ZBT-SRAM and the system can communicate with the controller module through PC104+ interface. The system structure, implementation and test results are described in detail.
Research on Control System for Sluice Gate Flow Based on Fuzzy Neural Network PID
Authors: Lou Guo Huan , Li Kang Wei
Published: September 2012

The control of water level and flow for channel irrigation system has nonlinear, time-varying and uncertainty characteristics. It is difficult to get satisfactory effect with traditional PID control. Aim at these features, this paper introduces a control method based on fuzzy neural network PID. This method both has advantage of PID control and has ability of fuzzy neural network self-learning and processing quantitative data. The control method can adjust the parameters of gate flow on-line quickly and efficiently and has good control effect and precision. The simulation results show the validity and correctness of the control method.
The Design of Signals Acquisition System Based on DSP and Wireless Transmission Device
Authors: Yan Liang Wen , Zhao Li Na , Li Teng Fei
Published: September 2012

By analyzing the characteristics and working principles of DSP series chip and TI’s RF chip, choose TMS320F2812 and CC2530 to realize data acquisition and wireless transmission. By SCI interface, the device finishes the data transmission between DSP and CC2530 ,and the wireless transmission between two CC2530 chips . In the paper , first introduce the hardware and software design of the device and then prove the feasibility of the device by drawing waveform of actual datum which are transmitted and received using the device .
Analysis of the Comparison of OFDM and WPM in the Communication System
Authors: Li Na , Gao Xian Jun , Hao Xue
Published: September 2012

The fundamental theories of OFDM and WPM have many similarities in their functions and performance but there are some significant differences which give two systems to be distinctive. OFDM signals only overlap in the frequency domain while the wavelet signals overlap in both time and frequency domain. In the paper, WPM instead of conventional OFDM is used in WIMAX system. The simulation results show the WPM on WIMAX has lower bit error rate compare to conventional OFDM WIMAX.
Innovative Design Based on Prototypes of the Main Mechanism of Table Lamp
Authors: Zhou Wan Chun , Lu Jian Jun
Published: September 2012

On the basis of analyzing the topological structure of an original mechanism, it leads to the generalized kinematic chain meeting the same topological structure characteristics of the original mechanism in accordance with the generalized principle of mechanism, number synthesis of kinematic chain and compound hings. Allocation of ground links and performing links in the kinematic chain can get all feasible specialized kinematic chains while considering practical design constraints. In the final step, concrete schematic diagram of mechanism being restored from specialized kinematic chains leads to a series of new mechanism different from the original one. Designers ascertain appropriate new mechanism after selection and analysis.
Investigation of Relationship between Instrumented Indentation Nominal Hardness and Reduced Elastic Modulus with Large Apex Angle Indenter
Authors: Ma De Jun , Guo Jun Hong , Chen Wei , Song Zhong Kang
Published: September 2012

Based on dimensional analysis, finite element numerical calculation is undertaken on elastic–plastic solids to investigate the relationship between instrumented indentation nominal hardness Hn and reduced elastic modulus Er for three different apex angle indenters. The half-included angles of axisymetric conical indenter models are 62.9°, 70.3°and 85.566° which are corresponding to the real indenters of cube corner indenter with 60° face angle, Berkovich indenter with 65.27° face angle and cube corner indenter with 85° face angle, respectively. The relationship between a nominal hardness/reduced elastic modulus (Hn/Er) and elastic work/total indentation work (We/Wt) is established with a sixth-order polynomial form for each apex angle indenter. For rigid indenter of instrumented indentation model, reduced elastic modulus Er=1/[(1+v2)/E], where E and v are elastic modulus and Poisson’s ratio of the indented material. Therefore, Hn/Er–We/Wt relationship can be used to give estimates of E. Accuracy estimation for the each relationship of each half-included angle indenter shows that the large half-included angle of 85.566° gives better Er measurement error of +11.56% for a low yield strength material(e.g., materials for which σy=100MPa, n=0 and E=200GPa), while for the smaller half-included angle of 62.9° or 70.3° indenter, the measurement error is > ±12.74%. The research in this paper confirms that Hn/Er–We/Wt relationship of large apex angle indenter such as 85.566° half-included angle is recommended to be used for estimating the elastic modulus E of indented material.
Initialization Techniques for Chan-Vese Model with Thresholding
Authors: Lan Hong , Zhang Lu , Wang Xuan
Published: September 2012

Chan-Vese model is one of classical active contour models for segmentation based on level set methods. It is the region-based model but in some cases it is still sensitive to the location of initial contours. The image thresholding is a simple but effective tool to separate objects from the background. In this paper, we integrate these two techniques and propose a new method to improve the initialization for Chan-Vese Model. First analyze the distribution of image gray level histogram and find the optimum threshold values, then set the model’s initial contours with thresholds and construct energy functional, lastly iterate the functional formulations until convergence to the object boundary. The method is tested on the plaque images and gives considerable increase in performance.
A New Infrared Image Magnification and Enhancement Method Based on Wavelet Transform
Authors: Guo Wen Sheng , Chen Feng , Sun Zhao You , Wang Xi Jun
Published: September 2012

The traditional image magnify method usually have some defects on details. This paper gives a new infrared image magnification and enhancement method which is based on wavelet reconstruction and gradation segment. In this method, first of all, make wavelet transform on the image, get the high-frequency coefficient. Apply the Newton differential algorithm enhance the high-frequency coefficient as the high-frequency part of the magnified image, treat the original image as the low-frequency part , make the wavelet reconstruction ,then get the magnified image. To enhance the magnified image, according to the double gray threshold, segment the image into high gray segment corresponding to target, low gray segment corresponding to background, and middle gray segment corresponding to transition sector. Then, make linear extension to them respectively; the result is the magnified image. Experiments indicate, this method is effective on distinguishing high-energy target from low-energy target (the low-energy target is the primary one) and displaying the details of image(edge profile of the bomb).
B-Spline Wavelets Vision Detection Technology Based on Adaptive Filter
Authors: Ye Ya Lin , Shan Ning , Zhang Qian , Yang Ke Li
Published: September 2012

Edge is the most important information for computer vision. Wavelets edge detection can reduce noise disturbing, and also loses weak edging. This paper presents a new algorithm for edge detection. Based on sharping imaging edging by adaptive filter algorithm, the algorithm can detect edge by B-spline wavelets. This new algorithm has more higher precision than those normal algorithms.
Design of Emotional Interaction System Based on Affective Computing Model
Authors: Yang Guo Liang , Zhang Jin Hui , Sun Hui
Published: September 2012

An emotional interaction system is designed by using the theories about affective computing in this paper, which includes the emotional information capturing, machine emotional model and emotional expression. This paper focuses on the problem of building machine emotional model, not only gives the basic definitions of personality space, mood space, and emotion space, but also establishes the quantitative relationship of personality mood and emotion. At last, this paper builds a machine affective model which can reflect the transformation law of the mood, emotion and personality. Related simulation results show that the model can effectively simulates the change law of human emotion. Finally, this paper designs the software interface of the emotional interaction system.
Research on Function Model of Binary Code
Authors: Gao Wei , He Jing , An Ke , Gao Hong Xia , Liu Cheng
Published: September 2012

The paper presents a reverse analysis and crack-found methodology with the functional model as the centre for OS trusted mechanism, pays attention to the functional model establishing of binary code and the description methodology. And it designs general XML-based storage structure to serve the storage and transformation of information cross levels in the level functional model of trusted mechanism, develops the plugin of IDA, which takes and stores routine Control Flow Graph and level functional model automatically from the binary code.
The Application of the Case Tool in Software Development
Authors: Ye Chun Feng
Published: September 2012

The specific applications of the CASE tool in the software development is discussed, including establishing the data model, the model transformation, the script files generation, the reversal engineering, and the database optimized technologies, etc. CASE has been proven to be with lots of advantages, such as speeding up the development, reducing software development cycle, improving the system operational efficiency and the system maintainability, etc.
Enterprise Data Security Research in Public Cloud Computing
Authors: Zhu You Chan , Liu Peng , Wang Jun Ting
Published: September 2012

This paper first analyzes the security issues that are hidden in the public Cloud Computing environments, then puts forward to the corresponding solutions of various security issues, and lastly summarizes the importance of choosing suitable cloud service for enterprises.
Human Computer Interaction Used in Virtual Maintenance Training System of Equipment
Authors: Li Xiao Yan , Sun Yun , Li Min
Published: September 2012

Allowing trainees to get a real sense of immersion, an advanced virtual maintenance training system of equipment must have an effective Human Computer Interaction. This paper discussed issues related to the design of Human Computer Interaction used in Virtual Maintenance Training System of Equipment, and provided specific implementation of three typical features: implementation of display text messages in real time; implementation of response to user input events; implementation of getting the interactive results. Based on a real-time visual simulation software system named Vega, human computer interaction were accomplished, and presented the code segment. Results show that the interface of human computer interaction was very friendly, and the Virtual Maintenance Training System of Equipment was efficient.
OpenFlow Implementation on NetMagic Platform
Authors: Jia Chun Bo , Huang Jin Feng , Su Qi , Sun Zhi Gang , Li Tao
Published: September 2012

Stanford University proposed a new network switch model named OpenFlow for the research of network innovation. OpenFlow enables researchers to control the behavior of the network by managing flow table. NetMagic is an open network switching platform for the innovative research of next generation Internet architecture. This paper introduces OpenFlow and NetMagic briefly, and implements a customized and scalable OpenFlow model system on the NetMagic platform. Finally, this paper shows the features and advantages of OpenFlow with an experiment.
Static Analysis of Run-Time Inter-Core Interferences for Concurrent Programs in Shared Cache Multicore Architectures
Authors: Chen Fang Yuan , Zhang Dong Song , Wang Zhi Ying
Published: September 2012

Worst-Case Execution Time (WCET) is crucial in real-time systems and is very challenging in multicore processors due to the possible runtime inter-thread interferences caused by shared resources. This paper proposes a novel approach to analyze runtime inter-core interferences for consecutive or inconsecutive concurrent programs. Our approach can reasonably estimate runtime inter-core interferences in shared cache by introducing lifetime and instruction fetching timing relations analysis into address mapping method. Compared with the method based on lifetime alone, our proposed approach efficiently improves the tightness of WCET estimation.
Security Architecture of Digital Library Research in General Knowledge Environment
Authors: Zhou Xiao Yan , Hu Zhi Hua , Shun Jian Kun
Published: September 2012

Ubiquitous service is a bran-new service idea and model of digital library. It emphasizes that the library should be centered on users, provide services at anytime and anywhere, and be embedded into user's work. The ubiquitous service model of digital library is mainly embodied in the mobile library service, the user environment-embedded service, the “cloud computing” -based service and the global network library service. Combined with the relevant application examples, this paper expatiates on and analyzes the basic types, characteristics and application status of digital library ubiquitous service. The Digital Library of the security threats facing and the reasons, according to OSI security architecture, examining the safety and security objectives of digital library, based on the principle of new casks, from the security strategy of several major Digital Library in the process of data security issues and propose appropriate safety measures and solutions, is intended to strengthen the library data from various aspects of information security.
The Internet of Things Used in the Intelligence Intravenous Transfusion System
Authors: Cui Yin Gan , Li Xue , Wang Xue Tong
Published: September 2012

This paper introduce the primary architecture and principle of intravenous transfusion device based on the internet of things , particularly detailed the collaboration medical monitoring platform, intelligent perception unit, Infusion monitoring service . Giving the program flow chart of main program and critical code of five liquid queue speed-measuring method. This system can satisfy the requirement of doctors for monitor and manage infusion process centralized. Therefore, it is worthy of reference to implement in similar system.
Application of Wide Band Oxide Semiconductor in Bulk Heterojunction Solar Cells
Authors: Ye Jian Min
Published: September 2012

To minimize interfacial power losses, thin layers of NiO, a p-type oxide semiconductor, are inserted between the active organic layer, poly(3-hexylthiophene) (P3HT) [6,6]-phenyl-C61 butyric acid methyl ester (PCBM), and the ITO (tin-doped indium oxide) anode of bulk-heterojunction ITO/P3HT:PCBM/Al solar cells. The interfacial NiO layer is deposited by radio frequency (RF) magnetron sputtering deposition directly onto cleaned ITO, and the active layer is subsequently deposited by spin-coating. Insertion of the NiO layer affords cell power conversion efficiencies as high as 2.5% and enhances the fill factor to 56% and the open-circuit voltage (Voc) to 605 mV versus ones without NiO buffering layer control device. The value of such hole-transporting/electron-blocking interfacial layers is clearly demonstrated and should be applicable to other organic photovoltaics.
A Research on Join-Points-Capture in Program Scope and Process-Control by AspectJ
Authors: Ma Su , Zhou Gang
Published: September 2012

This paper achieves the capture of Java-program-scope and joint-point-information based on process-control with AspectJ. This information includes: all joint points in particular classes, packages, and methods. It also includes all joint-points from beginning in program control-flow and those in which initial one is not included.
Base on Neural Network to Calculate the Reliability of the Power Turret Transmission System
Authors: Zhang Ming Yuan , Zhu Xiang Jun , Wang Ming Ming
Published: September 2012

First confirm the major factors which affect the reliability of the gear transmission system and make it as random variable, to establish BP neural network model. Make the test data as the training sample to train the neural network. Then base on the neural network to calculate and get the limit state function of the power turret, compile a program which can calculate the reliability of the power turret basing on the first-order second-moment method, and use this to calculate the reliability of the power turret transmission system. This method predigests the calculation model and reduces the calculation time.
The Virtual Experimental System Design for Automotive Electric Appliances Based on C#
Authors: Yan Ai Fang
Published: September 2012

In the thesis, the author analyzes the characteristics of the experiments for automotive electric appliances system and describes the ideas for the virtual experimental system design for automotive electric appliances by taking the automotive charging system as an example according to the overall system design principle and the requirements on the experiments, so as to design the overall framework and functional modules for the experimental automotive charging system.
Genetic and Quality Identification of Alfalfa Carried by Satellite
Authors: Qu Min , Zhang Hai Ling , Liu Feng Qi , Chen Feng Lian , Zhang Yue Xue
Published: September 2012

Astronautical mutagenesis is a new and security agricultural breeding technique in recent decades. There are very large differences in physical environment between space and ground. After returning to the ground, new varieties are bred by the conventional breeding techniques. There are rich genetic types in mutagenesis. In this paper, “Longmu 801” alfalfa seeds were carried by “Shijian-8” recoverable satellite and some new types were selected and bred. The genetic variation of 11 mutated lines and their CK were identified by RAPD analysis, determination of leaf protein concentrates (LPC) and crude protein. For genetic identification, 100 primers were tested and 19 primers were selected in RAPD amplification. The amplified bands and polymorphic sites were rich. Polymorphism points and ratios of polymorphism point were statistical in detail. They were 326 and 15.04% respectively. For quality identification, it was compared with yields of alfalfa LPC and crude protein contents. The results showed that the range of yields of LPC was 6.52%-7.65%, range of nitrogen content was 43.79%-52.38%. Comparing with CK, variation ranges were -3.99%-+12.99% and -4.45%-+12.49%.
Optical Camouflage Checkout Simulation Method Based on Visual Technology
Authors: Jin Le , Xu Bo , Yu Jin , Zhou Jia Hong
Published: September 2012

At present, many researchers doubt the suitability of pattern painting effect under current reconnaissance conditions. This is mainly owing to expensive expenses of aero photography. The paper probes into and utilizes the visual scene of three-dimension to simulate the aero photography, and carries on the simulation detection research of optical camouflage effect, then carries on the optimum seeking and optimization to the simulated pattern painting designed in the paper.
An Investigation of Feature Extraction of Local Energy in Joint Time-Frequency Analysis Based on Process Systems Modeling and Simulation
Authors: Wang Feng Li , Duan Shu Lin , Gao Hong Tao
Published: September 2012

Aiming at the characteristics of local properties of the non-stationary signals, a noval feature extraction approach based on the local energy in joint time-frequency analysis is proposed. The concept of local energy in joint time- frequency analysis based on local wave analysis was used to measure the signal energy in time-frequency space of the signal. Firstly, analyze the signal with local wave method and then make Hilbert transformation of it. Then partition several areas in time frequency space and compute its local energy. From the expression of local wave time-frequency distributing, not only total energy of signal can be computed but also local energy in time-frequency space. Simulation research indicates that the developed approach was effective.
An Advanced Cascaded Method for Regional Wind Power Forecasting
Authors: Yuan Jin Sha , Yang Hong
Published: September 2012

Regional wind power forecasting deals with the prediction of the aggregated power output of wind farms located within a defined region. By architecture, regional forecasting models are classed by three approaches. In these approaches, the cascaded approach is a most practical method although the method has a larger prediction error. This paper provides a systematic review of all these regional forecasting approaches and ultimately proposes an advanced cascaded method to improve forecasting precision. The method use root mean square error as evaluation criteria to adjust every prediction of signal wind farm in a region. The simulation results show the effectiveness of the advanced cascaded method.
Parameter Optimization of BOD Water Quality Model Based on the Immunity Taboo Search
Authors: Wang Jia Yang , Li Zuo Yong , Zhang Bi , Zou Chang Wu
Published: September 2012

A new version of Taboo Search (TS), namely, Immunity Taboo Search (ITS) is first introduced and tried to optimize the parameters of BOD water quality model. Here, Taboo Search was improved by Immune Arithmetic (IEA). Parameters of BOD water quality model were optimized by ITS, the performance is compared with other method. Results show that ITS plays an important role in solving global optimization problem, and demonstrate the effectiveness and higher accuracy than other methods.
Preparation, Characterization of Organo-Montmorillonite under Focused Signal-Mode Microwave Irradiation
Authors: Lai Shui Li , Gao Ying Hua
Published: September 2012

In this paper，the organo-montmorillonite (OMMT) was prepared by cation exchange reaction, using sodium montmorillonite (Na+-MMT) and cetyltrimethylammonium bromide(CTAB) as all intercalation agent under precision microwave organic synthesis system. The structure of the montmorillonite was characterized by X-ray diffraction (XRD)、infrared spectrum (IR)、thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The results show that the intercalation is successful, the CTAB as a organic modifier introuduced into lattice layers of montmorillonite by cation-exchange reaction and the surface morphology of OMMT is complete exfoliation, the distance between the lattice layers of montmorillonite has been greatly increased.
Part-Of Speech Tagging Base on Hidden Markov Model
Authors: Wang Xi Jie , Hu Shun Yi
Published: September 2012

Part-of-Speech Tagging is the fundamental problems in natural language processing .The paper introduces the representation of the Hidden Markov Model (HMM) and the needs to solve the problem, and then discusses the parameter estimation method of the HMM model, and research on basic principles of Part-of Speech Tagging using Viterbi algorithm.
Research on Comprehensive Planning and Statistics Index Model of Power Grid
Authors: Wu Ke He , Pan Pan , Xu Zhi Qi , Li Qian Yu
Published: September 2012

Comprehensive planning statistics is a significant economic management activity and plays an important role in comprehensive planning management, which directly affects the production, construction, development and economic benefit of power grid. This paper presents the current situation of comprehensive planning statistics in Electric Power Corporation, defines the index model, and elaborates index statistics and analytical methods in terms of demands of the business statistics. Then it proposes index model for comprehensive planning statistics of power grid.
Research on Warship Maintenance Support Simulation System Based on the Method of Equipment Maintenance Support Simulation Experiment
Authors: Peng Ying Wu , Li Qing Min , Wang Rui , Mao De Jun
Published: September 2012

Equipment maintenance support simulation experiment (EMSSE) is a method of studying maintenance support problem about decision-making about uncertain support scheme alternatives. Aiming at the character of complexity and uncertainty on the warship equipment maintenance support system, a type of structure applied to the warship equipment maintenance support simulation system was brought forward to support EMSSE based on the functional demand of system, and the interface layer, running-time layer, and data layer were analyzed in detail , and the executing process was designed. Finally, a warship maintenance support simulation system (WMSSS) which was developed and realized based on system design, which was used to make an experiment. The result of simulation experiment validates that WMSSS is feasible and reasonable to supply uncertain decision assistance for warship maintenance equipment support.
Simulation of Stepped-Frequency LFM Radar Echo Based on FPGA
Authors: Ou Jian Ping , Liu Sheng Qi , Niu Wei
Published: September 2012

An implementation framework of stepped-frequency LFM (SF-LFM) radar echoes simulator is presented in the paper based on the decomposition and calculation of SF-LFM radar echoes of a moving target. The proposed method can be implemented conveniently with direct digital synthesis (DDS) logic resource. The feasibility of this resolution is verified with computer and semi-physical simulations experiments.
Simulation on Combustion Characteristics and External Characteristics of the Linear Engine System
Authors: Yin Zhao Lei , Wang Zhe , Deng Jun , Zhang Tong
Published: September 2012

A simulation model of the linear engine system is built in this paper. The cylinder pressure data obtained through engine experiments is used to validate the accuracy of the simulation model. Based on the model, the combustion characteristics and external characteristics of the linear engine system were studied. And the maximization model is used to find an optimum operating region of the linear engine. The results show that, as the air fuel ratio(AFR) decreases under a steady engine speed, both the cylinder pressure and brake power increase first and then decrease, reaching their peak value when the AFR is 12. Under this AFR, the maximum brake power is 16.83kW at 6500rpm. Meanwhile, the fuel economy and the power performance reach the optimum combination within 5200rpm and 6500rpm.
Elastic Modulus of Tetrakaidecahedron Closed-Cell Cellular Materials
Authors: Zhu Hong , Zhang Li Gang , Qi Xiang Dong , Wang Jian
Published: September 2012

Based on the principle of pore formation, geometric model to describe the closed-cell cellular materials is constructed. The model is tetrakaidecahedron shape with all thick edges. The dependence of relative density on microstructure of the model has been analyzed. By using finite elements method, the relative elastic modulus of the model is calculated. Wall-thickness and wall-face connective curvature radius are found to be the two independent factors affecting relative density. Nonlinearity which relative density produces on relative elastic modulus is obviously greater than one which wall thickness produces. For high and low porosity cellular materials, the materials added at the intersecting part of the wall-faces bring different influence on elastic modulus.
Numerical Simulation of Stable Turbulence Generated by the Pipe Flow of Self-Regulating Air Driving Power Supply for Airflow Piezoelectric Generator
Authors: Cai Jian Yu , Lu Na , Chen He Juan
Published: September 2012

In the pan or platform carrier supply system, the intake pipe structure of the generator is very important for stability and efficiency of the airflow vibration-driving work in the small-hole aerodynamic piezoelectricity generator. Hyperbolic curved nozzle produces higher jet velocity than straight-wall nozzle. Using CFD method, contrast and analyse the annular identical-cross-section straight pipe and annular hyperbolically curved pipe, the calculation results prove the superiority of the hyperbolically curved pipe. For the geometry characteristic of the annular hyperbolic curved pipe structure, influence on the velocity distribution through varying parameters of the structure size was found out. The results show that development of the velocity distribution is directly affected by the length of straight pipe section of the pipe; better velocity distribution is obtained when length of straight pipe increases properly. On the other hand, a smaller ratio of aperture ring gap has a significant contribution to the out airflow velocity distribution.
Modal Analysis of High-Speed Traction Motor Rotor Shaft
Authors: Xiang Hui Yu , Han Bao An , Leng Chong Jie , Gong Yan Jue
Published: September 2012

Being one of the key parts in high-speed traction motor ,rotor shaft has a great influence on the dynamic characteristics of high-speed traction motor. This paper uses the UG to establish a simplified model of high-speed traction motor rotor shaft. The modal parameters were calculated and its inherent frequency characteristics were investigated with the analysis software MSC.Nastran. And we also analyze and calculate the foregoing five model shape of high-speed traction motor rotor shaft. These can provide a basis for the optimization design of high-speed traction motor rotor shaft and its dynamics analysis.
An Experimental Investigation on the Effect of Clearance on the Dynamic Characteristics of the Frame Towers
Authors: Duan Zhen Ya , Wang Zhong Qing , Li Peng Fei , Li Rong
Published: September 2012

In this paper a test set has been established and the effect on the dynamic characteristic of the frame tower by the joint clearance between the frame and tower has been studied experimentally. Experimental results show that the frame with clearance has no influence on the natural frequencies of a single tower, while it has constraint for the single tower’s displacement. Included in this study are the discussions on the influence of support position on the dynamic characteristics of the frame tower with a clearance. The analysis shows that the damping ratio increases and maximum amplitude descends with the increase of height of the support position.
The Mini-Vehicle Manual Transmission Reverse-Gear Noise Analysis
Authors: Lv Jun Cheng , Yang Lian Bo , Ding Xiao Ming
Published: September 2012

In order to resolver the question of transmission reverse gear noise, this paper construct virtual transmission model with MASTA soft and analyze NVH ,computed transmission system frequency and gear mesh frequency, finally, find system’ resonation point and corresponding engine speed, this result is accordant to test one, finally, paper draw a conclusion that the noise is caused by resonation at some engine speed.
Research on the Photometry and Corrosion Characteristics of Rare Earth Iodides in Ceramic Metal Halide Lamps
Authors: Li Wei , Shi Shui Jun , Wei Ying Dong , Zhou Zhen Min , Zhang Shan Duan
Published: September 2012

Rare earth iodides are commonly used in ceramic metal halide (CMH) lamps, a kind of high intensity discharge (HID) lamp. Rare earth metals in the discharge plasma inside the arc tube contribute to the superb performance of CMH lamps. On the other hand, however, polycrystal alumina (PCA) arc tube corrosion due to its reaction with rare earth iodides causes the deterioration of parameter maintenance, and constrains lifetime of the lamps. In this study, PCA arc tubes with specific rare earth iodides are prepared. Aging tests up to 2000 hours are conducted to evaluate the effects of single rare earth iodides on lamp performance. Also X-ray analysis shows the corrosion content of PCA arc tube by different rare earth iodides. The result shows that PCA tubes with single rare earth iodides are more corrosive than the mixture of various rare earth iodides.
Study of Driving Force and Synchronization on a Space Docking Lock System
Authors: Huang Tie Qiu
Published: September 2012

steel ropes are adopted to connect the locks in a space docking lock system. The dynamic transmitting characteristics of steel rope is analyzed and formulated, and then a dynamic model of space docking lock system including one active lock and five passive locks is established. The driving forces and movement synchronization of this lock system is revealed through simulation based on the dynamic model.
Study on Characteristics of Flow-Induced Vibration in Pre-Opening Sleeve Valve
Authors: Tu Shan , Li Ming Hao , Wang Chao , Dong De , Shi Yue Juan
Published: September 2012

Flow-induced vibration widely exists in fluid power machinery, and there is a great relation between the vibration and engineering construction. In this paper, prototype valve experiment and three-dimensional simulation has been done on the pre-opening sleeve valve. High-frequency minute dynamic pressure sensors are adopted in the valve in experiment. Vibration data with dynamic pressure in different conditions are collected and measured to find out the pulsation characteristics of the valve disc during the experiment. Meanwhile, three-dimensional numerical simulation and analysis on the internal flow field of the valve has carried out, in order to discover the factors of vibration induced by fluid flow. The result shows that the main cause of flow-induced vibration varies in different conditions. At the condition of large opening and large pressure difference between valve inlet and outlet, it is mainly due to vortex-induced vibration. Several ways such as improving damping, avoiding the resonance frequency and changing the type of the valve profile can be taken to weaken the vortex-induced vibration.
Automatic Monitoring of Vacuum System on Transmission Electron Microscope by Event-Based Approach
Authors: Cui Yong Jun , Dong Quan Lin , Zhang Xiu Yan
Published: September 2012

The vacuum system control strategy based on event-driven approach is considered for monitoring startup status, stable operation status, shutdown status and failure processing of transmission electron microscope (TEM). Hierarchical structure is adopted so as to reasonably compartmentalize the vacuum control tasks. For startup operation, control logic flow of vacuum system is designed by event-based control mode. Finally, through the actual operation of the test results indicate that the vacuum control system fulfills design requirements and the event-based control mode is effective.
Design of Parallel Control Structure of Alternating Current Servo System
Authors: Zhang Ying , Wu Wen Jiang , Guo Ya Jun
Published: September 2012

Aiming at wide variations in loads and moments of inertia, large disturbed moment of machine tool servo system, a parallel control structure is proposed, and sliding mode structure controller and PI Ziegler-Nichols controller of the position loop are designed. The sliding mode controller can restrain effects of parameter uncertainties and external disturbances and the PI Ziegler-Nichols can realize the parameter adjustments of the integral and proportion of the classical PI controller. Simulation results show that the designed parallel controller can guarantee high performance of tracking behavior and robustness.
Localization in Wireless Sensor Networks in Beacon Drifting Scenarios
Authors: Xia Ming , Chen Qing Zhang , Jin Yan
Published: September 2012

The beacon drifting problem occurs when the beacon nodes move accidentally after deployment. In this occasion, the localization results of sensor nodes in the network will be greatly affected and become inaccurate. In this paper, we present a localization algorithm in wireless sensor networks in beacon drifting scenarios. The algorithm first uses a probability density model to calculate the location reliability of each node, and in localization it will dynamically choose nodes with highest location reliabilities as beacon nodes to improve localization accuracy in beacon drifting scenarios. Simulation results show that the proposed algorithm achieves its design goals.
Analysis and Solution about Overvoltage of Automatically Passing Neutral Section System
Authors: Wang Ran , Zheng Trillion Q. , Ma Hao Yu
Published: September 2012

Over-voltages happen when electric locomotive passes the neutral section, which has serious influence on safe operation of the traction power supply system. This paper builds the model of contact net and neutral section of traction power line and analyzes transient process of the electric locomotive passing the neutral section. This paper proposes automatic control system for electric locomotive passing neutral section. It is effective to avoid the over-voltages.
The Design of Millimeter-Level Ultrasonic Distance Measurement Circuit
Authors: Chen Yi Kang , Zhang Zheng Jie , Chen Ming Rui
Published: September 2012

By analyzing the causes of ultrasonic distance measurement error, through the use of temperature compensation, and increasing the measured time interval to the microsecond level, ultrasonic ranging circuit can achieve the millimeter level. After the circuit design and construction, the ultrasonic range finder was calibrated from 1cm to 21cm. The measurement results show that in the scope of work, the linearity reached 0.999623; the measurement of the ultrasonic range finder achieved the millimeter level.
The Optimal Switched Law Methods Analysis and Research on Switched Linear Systems
Authors: Zhou Xue Song , Liu Yi Qi , Ma You Jie , Liu Si Jia
Published: September 2012

The stable linear switched systems will converge to the balance Point. If different switched laws be chosen, the convergence Process will not be the same, so there is an optimal switched law. The issues of optimal switched law based on norm, convergence radius, convergence distance and convergence direction are respectively studied, and the optimal switched law is confirmed by solution of matrix equation. All kinds of instance have been considered synthetically, the synthetic optimal switched law is given, by which an optimal status of system in convergence process is reflected roundly. By calculate and simulation of practice examples and the using process of stability criterion is realized distinctly.
Research and Improvement of LEACH Protocol for Wireless Sensor Networks
Authors: Wang Qing Hui , Guo Hong Yan , Ji Yong Huan
Published: September 2012

The data transfer of wireless sensor network (WSN) can not be separated with routing protocol, Energy efficiency is one of the most important factors in wireless sensor networks. In this paper based on the uneven distribution of the LEACH cluster head and the different lengths and base station communications, we present a improved LEACH algorithm which refers to remaining energy and optimal cluster heads. Computer simulation using NS2 reveals that the proposed protocol reduces the energy consumption compared with the existing LEACH protocol.
A New Type of Tire Testing Machine and Finite Element Analysis of the Frame
Authors: Tian Fang , Song Ping Ping , Tao Ke
Published: September 2012

A new type of tire testing machine is put forward. Various road surfaces can be imitated by this machine. The highest speed per hour is 250kM/h. Through finite element analysis the frame of the machine satisfy the design requirements in the aspect of strength and flexibility. Dynamics analysis demonstrate that the frame's natural frequencys are more than 90Hz. In this way covibration can be avoided effectively. The each rank amplitude are less than 10μm, this value is within allowed band.