bluuebunny/crossref_metadata_2025 huggingface dataset:
Improved Stack Algorithm for MIMO Systems
Authors: Liu Li , Wang Jin Kuan , Song Xin , Han Yin Hua
Published: July 2013

Multiple input multiple output (MIMO) systems could increase wireless communication system capacity enormously. The best optimal detection algorithm for MIMO systems was maximum likelihood (ML) detection algorithm, which could provide the best bit error rate (BER) performance for MIMO systems. However, the computational complexity of ML detection algorithm grew exponentially with the number of transmit antennas and the order of modulation, which resulted in difficult using for practice. A modified MIMO signal detection algorithm which combined ML detection with stack algorithm was presented in this paper. After performing QR decomposition of the channel matrix, the ML detection with length L was done firstly. The partial accumulated metrics were calculated and sorted, which produced an ordered set secondly. Based on the ordered set, stack algorithm was performed to search for the symbol with the minimum accumulated metrics. The proposed algorithm reduced the probability of look back in stack algorithm.
Dynamic Mapping Processing between Global Ontology and Local Ontologies in Grid Environment
Authors: Luo Yong Hong , Yu Zhou , Zhuang Yan Hao , Zheng Zhao Peng
Published: July 2013

Global ontology and local ontologies can be built to effectively implement data semantic access in integration environment of multiple data sources based on grid computing. Data sources, as a kind of resource in grid, can join and quit grid environment dynamically. In order to ensure consistency between global ontology and local ontologies, we present joining and quitting algorithms for data sources in grid system. During processing of joining and quitting algorithms, global ontology elements were divided into two types of AES(Active Elements Set) and SES(Suspended Elements Set),and we stipulate that only mappings formed by AES can be employed for semantic data processing.
The Signal Processing Technique in the Time-Domain Approach of Determining the Residual Error Terms of the Calibrated VNA
Authors: Song Cui Lian , Liu Xin Meng , Huang Hui
Published: July 2013

Sophisticate mathematic computation is used when the residual error parameters are estimated employing time domain technique. This paper discuss the improved method of employing Window function before the inverse Fourier transform. At the same time, we find the curve of time domain will be out of the standard shape when the linear prediction of the measured signal section is too long, and some figures are offered to illustrate it.
Design and Implementation of the Chaotic Circuit Based on Integrated Operational Amplifiers
Authors: Ma Cai Hong , Ge Hai Bo
Published: July 2013

The principles and methods of chaos generation are researched using piecewise linear circuit theory. The chaos generation circuit based on integrated operational amplifiers is designed to realize chaos. Simulation results of the circuit are got using Multisim software. It indicates that using this method, the relationships and laws between chaos and various circuit element parameters can be better found out.
Language-Pair Scoring Method Based on SVM for Language Recognition
Authors: Wang Xian Liang , Wu Zhi Gang , Zhou Ruo Hua , Yan Yong Hong
Published: July 2013

Support vector machine one vs. rest classification and Gaussian backend classifier are commonly used for language recognition. The LDA matrix of Gaussian backend classifier is often singular when the traditional one vs. one classification is used, and the recognition performance is very poor. In this paper, we present language-pair scoring method, and the performance improved significantly after re-modeling the one vs. one scores of support vector machine. Our experiments are carried on NIST 2011 language recognition evaluation 30s data corpus. Results indicate that the proposed language-pair scoring method obtains equal to or even better performance than traditional one vs. rest classification for ivector and SVM-GSV language recognition systems. The experimental period is also shorten, and the linear fusion result of the proposed method and one vs. rest obtains significantly better performance.
A Topic Description Model Based on Two-Layer Kl Distance
Authors: Lin Da Zhen , Lin Xian Ming , Cao Dong Lin
Published: July 2013

The main challenge of Topic Detection and Tracking (TDT) for Blog is the insufficient information in a topic description and the lack of key words input by users. We propose a Two-layer KL Distance approach which combines the KL distance model with a lexical semantic association matrix model. First, the KL Distance model captured the weights of Initial feature words. Second, the KL Distance model was used again to estimate weights of words linked with initial feature words in the lexical Semantic Association Matrix. Extensive experiments show the advantages of our method over the baselines as well as the effectiveness of the two-layer of KL Distance.
A Parallel Framework for Automatic Matching for High Resolution Imagery with Large Size
Authors: Zhu Shi Bing , Yang Sheng
Published: July 2013

Matching Algorithms are explored by many experts, lots of good methods are used for photography, computer vision, 3D reconstruction etc. Such as SIFT and some other improved algorithms that are robust to translation, rotation, illumination, angle of view, and scale different. However, it is a bottleneck for their application in some in time system because of their high time cost. A parallel framework for automatic matching for high resolution imagery with large size is introduced, the most time-consuming parts while matching are devised by parallel in a server with many cores, for example, the feature extracting, matching, and the quick quasi-dense matching on the epipolar resampled images. Experiments show that, it works efficiently and robustly.
An Effective X-Ray Image Segmentation Method for the Pharmaceutical Industry via Surface Fitting
Authors: Shi Kai Hong , Lu Zong Qing , Liao Qing Min
Published: July 2013

Image segmentation techniques currently used for X-ray inspection in pharmaceutical industry suffer from some limitations. The object in an image is close to the background and its contours are weak or blurred because of the X-ray imaging characteristic. Based on our research of X-ray inspection, a simple and efficient image segmentation method is proposed in this paper. It is implemented by treating the image and desired contours as three dimensional surface and holes respectively in order to simplify the model of segmentation, and making use of surface fitting and image subtraction to extract the target region efficiently. The novelty of this approach is that we need less selection of parameters to extract contours with low contrast by surface fitting. Experiments on real X-ray images demonstrate the advantages of the proposed method over active contour model (ACM) and Chan_Vese model (CV model) in terms of both accuracy and efficiency on fixed condition.
A Real-Time Dynamic Gesture Recognition System
Authors: Guo Jiang , Cheng Jun , Guo Yu , Pang Jian Xin
Published: July 2013

In this paper, we present a dynamic gesture recognition system. We focus on the visual sensory information to recognize human activity in form of hand movements from a small, predefined vocabulary. A fast and effective method is presented for hand detection and tracking at first for the trajectory extraction. A novel trajectory correction method is applied for simply but effectively trajectory correction. Gesture recognition is achieved by means of a matching technique by determining the distance between the unknown input direction code sequence and a set of previously defined templates. A dynamic time warping (DTW) algorithm is used to perform the time alignment and normalization by computing a temporal transformation allowing the two signals to be matched. Experiment results show our proposed gesture recognition system achieve well result in real time.
The Dedusting Method Based on a Single Still Image
Authors: Wang Yuan Yu , Yang Chong Yang , Wang Xing Kui
Published: July 2013

In order to restore the image in dust environment, a method was proposed to restore the images in dust environment based on a single still image. Firstly, an image degradation model considering multiple scattering factors caused by dust was built using the first-order multiple scattering methods. Then, a new geometric depth model of single image was presented. This model utilized depth map of a dust image to improve usual geometric depth model. According to the new model the every distance of the objects in dust environment was able to acquire from a single still image. Finally, an image in dust environment could be restored according to the relationship between the dark channel prior model and the distance information which was calculated by the geometric depth model. The experimental results have shown that the method enhanced luminance and contrast. The method provided a foundation for target recognition in the dust environments.
Study on the Generation Model of Weighted Visual Codebook for Action Recognition
Authors: Lin Xian Ming , Li Shao Zi , Cao Dong Lin , Zhuang Wei Yuan
Published: July 2013

The action recognition based on local spatial-temporal feature has attracted more and more attentions. The codebook used in the recognition is usually generated by k-means and the code words are considered to have the same importance. But in fact, it isn’t true. So in this paper, we propose two strategies to measure the importance of different code words and improve the HIK-Kmeans algorithm .The experiment result shows that our improved algorithm increases the accuracy of action recognition.
A License Plate Character Segmentation Method Based on Character Contour and Template Matching
Authors: Zhang Yi , Zha Zhi Qiang , Bai Lian Fa
Published: July 2013

In order to solve the problems of the cracked and adhesive characters of license plate caused by the plate frame, rivet, light intensity, a novel character segmentation method based on character contour and template matching was presented. In the proposed methodology, the license plate image contrast was enhanced by the adaptive gray stretch method. The cracked and adhesive characters were accurately extracted owing to the spatial scalability of the contour. Then the found characters were matched according to the adaptive templates. The characters were segmented once more by the best template and then residual characters were complemented and fake characters were removed. A large number of character segmentation experiments under different illumination conditions were made. The results show that the method has a strong robustness and practicability.
Study on Magnetic Induced Polarization Technology and Instruments
Authors: Li Jian Hua , Lin Pin Rong , Shi Fu Sheng , Zheng Cai Jun
Published: July 2013

In order to solve the difficult-ground areas of electromagnetic prospecting, we study magnetic induced polarization technology and instruments. Adopting the techniques such as GPS synchronization, CPLD(Complex Programmable Logic Device), digital PWM(Pulse-Width Modulation) constant current, VHDL(Very high speed integrated circuit Hardware Description Language) programming, a magnetic induced polarization instruments have been developed, which include transmitter, receiver, and three components magnetic field compensator. Instruments have functions such as high-power constant-current supplying, frequency-selective anti-interference receiving, GPS high-precision synchronizing, and amplitude-frequency response of magnetic sensor is flat. Using gradient configuration to obser the original data include magnetic field strength, magnetic polarization rate, phase, and get the magnetometric resistivity, the percent frequency efficiency by the further processing. For magnetic induced polarization instruments, we develop performance testing and the field experiments.
Detection and Communication of the Intelligent Electric Meter
Authors: Zhang Shuan Ji , Zhang Min Zhe , Li Xu
Published: July 2013

This paper firstly introduces the development of the electric energy meter and the future trend, the overall design scheme of intelligent electric meter is given, a software development platform built. Then the design of voltage and current detection circuit, TCP/IP communication circuit, network interface driver and embedded WEB page. System uses LPC2290 as the main control chip, using the United States ADI company's ADE7755 chip energy metering, can not only realize the measurement of electric energy, but also can accomplish the communication with the host computer, easy to build energy management platform for energy management and control etc..
Overview the Development of Technologies in Smart Substation of China
Authors: He Gui Xiong , Chen Xiao Shuang , Jiang Li Min , Meng Jun Xia , Pan Deng
Published: July 2013

Smart substation is the tendency of the evolutionary substation in the future and is one key parts of smart grid. The Technical guide for smart substation is published by State Gird Corporation of China for the construction of smart substation. This paper recounts the differences from substation and smart substation, describes the system architecture of smart substation, characteristic of smart equipment and monitors the status of smart equipment. Base on the automation and communication technology, it research on the applications of smart equipment and information technology in smart substation of China. Finally, it prospects the application of smart substation.
A Novel Method for Excitation Control of DFIG Connected to the Grid on the Basis of Similar Signals from Rotor
Authors: Thang Nguyen Trong , Ban Nguyen Tien , Hai Nguyen Thanh
Published: July 2013

This paper proposes a novel technique for the new excitation control of the doubly-fed induction generator (DFIG) on power-station which connected to the grid. That is using the similar signals from rotor of a small capacity doubly-fed induction machine (DFIM) as a base to generate the control signals for the former DFIG. Based on this method, a simple but effective controller is designed, which ensures to decouple the active and reactive power supplied to the grid by using two separate parameters Kp and Kq. The advantage of this method is that it is simple but still effective.
Research and Design of Pre-Warning System for Coal and Gas Outburst Based on Data Mining
Authors: Deng Ming , Liu De Fang , Liu He , Chen Ning Ning
Published: July 2013

Coal and gas outburst is one of the most important natural disasters in our country. Thus pre-warning has the great significance to production safety for coal mine. In view of the facts of current pre-warning technologies, such as single pre-warning indicators, poor performance under interference and low real-time capability, some new pre-warning models are presented. The models include G line, moving average line and so on. Based on data mining theory, the pre-warning system works on the time series of gas emission concentration (which is called G series), and the pre-warning system for outburst is designed as well. 4.19 coal and gas outburst in Dashu Village Coal Mine of Hebei Fengfeng Coal Mining Group is studied based on pre-warning system. And the result is in accord with accident investigation. The analysis shows that the pre-warning system can mine the outburst developing process information of coal-rock dynamical system from the time series of gas concentration and realize outburst accidents pre-warning.
Study on Numerical Control System of Lampcover Spinning Machine
Authors: Zhou Jian Hong , Shen Peng , Weng Zheng
Published: July 2013

Chinese spinning technology has developed for more than 40 years. Especially in recent years, various kinds of spinning equipment have been developed and contributed a lot to Chinese equipment manufacturing industry, but it is blank in the light industry and civil industry. Due to the high cost and programming complexity of NC machine tools, we have no dedicated spinning machine and mostly rely on simple manual in the lampcover production. As to the above problems, we developed the lampcover NC spinning machines that can generate the track automatically and complete automatic control in the machining process.
Volume Haptic Rendering of a Deformable Object Using Shape-Retaining Chain Linked (S-Chain) Model
Authors: Oh Jong Seok , Choi Seung Bok
Published: July 2013

In this paper, a new volumetric deformable model that is suitable for real-time haptic rendering is proposed. Haptic rendering is the process of calculating and generating repulsive force in response to user interactions with virtual objects. In order to embody a deformable object into virtual space, a volumetric deformable object represented by a shape-retaining chain linked (S-chain) model is adopted. S-chain model allows for fast and realistic deformation of elastic objects. The classical S-chain model was satisfactory but there was still room for improvement. In order to improve this limitation, we propose an advanced S-chain algorithm which can be compatible with classical S-chain model.
Application Study of Computer Simulation Model on Growth Visualization of Poplar
Authors: Zhang Jing , Zhu Jie , Dong Wei , Liu Xu Ning
Published: July 2013

In order to stimulate growth model of poplar and achieve the visualization of poplar growth, the growth model is investigated from the perspective of computer simulation technology. The paper first presents physiological changes of poplar, discusses the changing rules of the space-time state of poplar growth, proposes the growth model of poplar based on state machine and predicts the growth of poplar authentically. Based on this model, the visualization algorithm of poplar growth is constructed; the data of poplar growth is properly organized; a simulation prototype system is developed to verify the validity of the model. Practice has shown that this growth model can simulate growth process of poplar and has high correctness and efficiency in the application of poplar visualization.
A Design Method of Signal Generator Based on DSP6713 and D/A Converter
Authors: Wen Liang Dong , Yin Bo Hua , Liu Jun Biao
Published: July 2013

The system completes the design of signal generator by using the technology of the Direct Digital Synthesizer (DDS). The DSP6713 designed as a key device, realizes outputting triangle wave and sine wave. The digital to analog (D/A) converter circuit is composed of AD768 and LTC1597, which helps improve the speed of converting and modulate the range of the output voltage by Digital Signal Processor (DSP), comparing with using one chip of D/A and proportional amplifier. In addition, bus topology makes extending system functions become easy. The system can be widely used in such field as communication, automatic control and instruments.
An Experimental Study on Synchronizing Process of Synchronizer
Authors: Zhong Zai Min , Lv Qiang , Chen Xue Ping
Published: July 2013

Based on the establishment of each independent phase theoretical model during synchronizing process of synchronizer used in HEV (hybrid electrical vehicle), an experimental means to analyze that synchronizing process is put forward in this article. Firstly, alternative current impedance analyzer is adopted to obtain amplitude and phase angle information of equivalent complex impedance between engaged gear ring and synchronizing ring. There are significant changes between the obtained results when the phase transition happens. Therefore, the moment of each phase transition can be determined through the experimental data. Then, to verify the consistency of the experiment mentioned above, a series of experiments are conducted under different rotation speed differences between the driving and driven cone. The experimental results show that different rotation speed differences lead to different moments when the severe mutation of amplitude and phase angle of the equivalent complex impedance occurs. It demonstrates the validity of the experiment that the rotation speed difference which belongs to phase transition criteria has a certain influence on the phase transition process. Furthermore, it is quite consistent with the actual situation, which also verifies that the experimental method put forward in this article has certain reliability.
Design of Bluetooth-Based Smart Home Intelligent Controller
Authors: Yang Chang Long , Ji Fang , Wang Wei Wei
Published: July 2013

We give a proposal of smart home control system based on the Bluetooth to overcome the shortcomings of traditional smart home and meet the needs of the modern smart home. And we have already researched and designed an intelligent controller based on this control system. The intelligent controller uses ARM S3C6410 as processor, and the Bluetooth module use the CC2540 which conforms to the standard of Bluetooth 4.0. The intelligent controller use the Android as operating system, and the function of the smart home system is realized base on the controller.
Design Principle and Data Analysis of Clamp Meter
Authors: Sui Shou Gang , Tan Jin Dong , Lu Shou Yin
Published: July 2013

Clamp meter is widely used in the production. It is divided into the current clamp meter, voltage clamp meter and resistance clamp meter according to its function. In this article, design idea and design method of a resistance clamp meter are given. Taking the resistance clamp meter as the object, from signal generation, sensing, detection, filtering, and other aspects the design principle and circuit model is described, the actual data measured, and the reason of measurement error analyzed.
Study and Realization of Stage Lighting Console
Authors: Ren Hui , Li Yan Zhe , Zhang Hua Bing
Published: July 2013

At present, most of the stage lighting console designs are based on MCU(Micro Control Unit), but its technique advances, information storage and real-time performances are deficient. This paper proposed that using the technique of ARM-Linux can realize the function of lighting console. This technique adopted S3C2440 processor as the main control chip of the hardware. The transmission of dimming data followed the DMX512 agreements. The low-level driver programs were developed under linux2.6.12, it provided interfaces for upper layer application. Testing results show that this system has perfect dimming performance and scalability, which is easy to upgrade. Our design has important theoretical significance and practical value for stage lighting control.
Design of a Simulation System for Emergency Networking Based on Microwave Communication
Authors: Yin Shu Hua
Published: July 2013

Aimed at the backwardness of generation and assessment methods in communication guarantee, the paper designed a simulation system for emergency network of microwave communication. The system designed the architecture in the form of modular, constructed the modeling framework for communication equipment using hierarchy analysis, described the simulation process and proposed the simulation embodiments/realization methods through flow chart, realized the database management, and provided the evaluation basis of communication effect and the embodiments/realization methods. Finally, the feasibility and reliability of the system was verified through the daily network training simulation in this paper. The system provides more accurate analysis data and results to users through virtual evaluation methods, and can play an assistant decision role in communication guarantee scheme generation and effectively improve the efficiency of emergency communication guarantee.
Wireless Image Transmission System
Authors: Sun Ke Mei
Published: July 2013

A wireless image transmission system is proposed, which in order to offset the disadvantages of wire video monitor laying points hard, and disadvantages of wire video monitor implementing hard in bad circumstance. The core of the system is TI series of C5000 high speed DSP processor and radio frequency wireless communication chip. Through DSP transplantation of JPEG compression algorithm, complete image collection and image compression through DSP, use wireless receiving and sending module to complete wireless images data transmission. Use wireless receiving and sending module instead of emitter and network as image data transmission device, low cost, not required network fee, system can real-time complete terminal images collection and show. It can apply community guard and video monitor of deploying points urgently in the electric power system, factory, bank and other important department, which dont require higher performance.
On Improved Noise Variance Estimation for Aeronautical Communications
Authors: Jiang Yin Ping , Zhang Tao
Published: July 2013

The L-band Digital Aeronautical Communication System Type-1 (L-DACS1) has been considered as the potential standard for future aeronautical communications. As an important parameter for L-DACS1, the noise variance can be estimated via the well known Second-Moment-Fourth-Moment (M2M4) blind algorithm. However, due to influence from aeronautical fading channels, performance degradation is encountered by conventional M2M4 algorithm in L-DACS1. In this paper, channel responses obtained from L-DACS1 pilot symbols were carried out to compensate the estimation degradation brought by channel fading, which lead to an improved M2M4 algorithm for L-DACS1. It is shown through simulations that the proposed approach outperforms conventional M2M4 estimator in terms of estimation error for L-DACS1 in aeronautical fading channels.
Method of Attitude Measurement Based on the Geomagnetic and Gyroscope
Authors: Long Li , Zhang He
Published: July 2013

The trajectory correction capability of the Simple guided munitions is directly affected by measurement accuracy of attitude angle. A gesture detection method based on geomagnetic gyro combination is proposed in this paper in order to detect the projectile flight attitude, The yaw angle of the projectile is solved by using runge-kutta algorithm with angle information of MEMS gyro. Then roll angle and pitch angle of the projectile is solved by magnetic field component of the three-axis magnetic sensor. Finally, the whole attitude detection system is installed in three-axis non-magnetic turntable to have a performance test. Experimental results show that the attitude solution results error is small. Nearby blind area, the roll angle error reduced to 5° and the pitch angle error reduced to 4°. In other locations, the roll angle error reduced to 2° and the pitch angle error reduce to 1°. The measurement accuracy increased nearly tenfold, can satisfy the trajectory correction demand of simple guidance ammunition.
LED Visible Light Communication System Design and Performance Optimization Based on Ethernet
Authors: Bao Song Jian
Published: July 2013

To satisfy the requirements of visible light wireless communication technology, designed LED visible light communication application system based on Ethernet. Influence factors of system performance were studied and took specific measures to optimize system performance. Reduced the influence of background light, improved the communication distance, inhibited LED light source tailing phenomenon, and improved the rate of the edge of the LED. The LED visible light communication technology blends into the Ethernet, provides a new solution for wireless broadband access, this solution has the broad application prospect.
Towards Learning Web Service Applied to Heterogenous Systems
Authors: Lin Fei , Zhang Wan Jun , Sun Yong
Published: July 2013

The widespread adoption of broadband Internet connections has led to a fast growth of applying web-based learning systems (LS) to education, LS becomes more important in e-learning and future education. LS provides a centralized environment where learners can study, communicate, etc. With the Internets growth, various learning contents and different LSs are distributed independently. Thus, managing the distributed information and implementing interoperability between learning contents and LSs are more challenging. Web services are the most innovative and well-established technology for communications between heterogeneous applications. This paper proposes the architectural model for sharing learning contents between heterogeneous systems. It includes requirements analysis, sharable learning contents format definition, and model design. Sharable learning contents is defined based on the concept of learning object and implemented in the favor of transactional memory. The model is divided into five modules for different tasks, which implements maximum reuse of high-quality educational resources on web conveniently.
Design and Implementation of an Intelligent Billing Algorithm for Open Computer Room Management System
Authors: Lou Qi Ming , Li Ying Fang , Zhang Hong Wei
Published: July 2013

Computer room is an important infrastructure of information technology on education for colleges, how to balance the load, calculate fees flexibly, improve resource utilization, service for the teachers and students better is an urgent problem.Firstly, the development trends of computer room management systems are discussed in the paper. Secondly, gives a data model of open computer room management system, which in order to balance the load and improve the utilization efficiency etc. of computer rooms. Finally, gives the intelligent billing algorithm according to the designed data model, and then implemented the algorithm using stored procedure with SQL Server 2005.
Research and Implementation of Voluntary Screening Algorithm in Online Course Registration System
Authors: Peng Yu , Shao Zheng Long , Li Yan Xia , Zhang Yu
Published: July 2013

The algorithm is a key part of the online course registration system. It plays a vital role on the online course registration system to ensure most of issues like fairness, network bottleneck, multi-registration and multi-dropping be solved well. By supporting the registration way of multi-level, multi-category, and multi-willingness, introducing the willingness of students into the calculation of course priority and letting the willingness of students affect the selective probability, it meets the registration requirement maximally and solves the issues well including fake registration number and random registration. This article will introduce the design and implementation of the algorithm.
Design and Implementation of the Marine Disaster Real-Time Evacuation Path on Android Platform
Authors: Huang Dong Mei , Du Yan Ling , He Sheng Qi
Published: July 2013

Evacuation path is an important part of the marine disaster decision support. It can provide evacuation paths quickly for the affected people to ensure life safety. The application is developed based on android platform. Take advantages of GPS to obtain real-time location information in order to achieve dynamic path of the affected personnel evacuation. It has solved problems of information delay, inability to obtain or update the data in real time caused by traditional methods. Thus, the application has high availability.
Effective use of the UML-Language in Small Companies
Authors: Borkovec Roman , Šedivý Josef , Hubalovsky Stepan
Published: July 2013

UML is a very useful tool for software development. Can streamline the development, saving not only time, but also problems in developing and maintaining applications appear. The problem is that when used in small teams and companies usually can ́t keep his overhead within reasonable limits, and so very often happens that he was such teams and companies leave.
Research and Implementation on Partition Table Recovery of Data Recovery Technology
Authors: Zhang Na
Published: July 2013

The data in computer is lost because of the destruction of disk partition table. To solve this problem, a data recovery solution by recovering partition table was proposed. The hard disk logical parameter was introduced. The hard disk addressing mode was analyzed. On the basis of analyzing disk partition structure, the recovery principle of MBR and EBR was proposed. After the specific process of partition table recovery was illustrated, an implement scheme was proposed and proved to be available.
Frequency Hopping Prediction Based on Multi-Kernel SVM
Authors: Yao Yu Kai , Yu Yong Qing , Liu Yang , Wang Jin Jin , Chen Xiao Yun
Published: July 2013

The chaotic frequency hopping sequences possesses short-term predictability. Via the phase space reconstruction approach, we can get chaos attractors, and the problem of series prediction can be transformed into the regression problem of the chaotic attractors. This paper uses SVR method to deal with the prediction of frequency hopping sequences. After analyzing the characteristics of existing kernel functions, we produce a new multi-kernel function, which is used for the prediction of frequency hopping sequences. Experiments show the fine performances of our methods.
Wireless Sensor Network Node Deployment Method for Soil Salinization Monitoring
Authors: Xu Xu Min , Feng Guo Fu , Ming Chen , Yun Zhang
Published: July 2013

Soil salinization is one form of soil degradation. In this paper, the formation of physical topology known as node deployment in wireless sensor networks is studied based on the characteristics of wireless sensor networks. After calculating the value of the edge length of the grid, the minimum number nodes achieved according to the relationship between the radius of node sensing and radius of node communication. For data transmission, a mobile sink energy efficient routing algorithm based on the shortest path was applied to reduce the energy consumption.
The Key Problem of Portable Food Traceability Electronic Weigher Design
Authors: Xu Hong , Zhang Yong Jun , Zhang Ping
Published: July 2013

This paper describes a portable food can be several key techniques in the design of electronic balance. First introduced the electronic balance control planning and power in the hardware design. Then analysis system software development process, and gives the software method to reduce system power consumption, and improve the system operation speed by adjusting the position of software code. The scheme of the embedded network communication system, for consumers and food operators to provide a friendly interface, service, humanity has the advantages of simple operation, low power consumption, good portability, meets the requirements of food traceability and food supervision.
The Research of Fire Risk Factor Evaluation
Authors: Liu Yun Xiang , Yuan Xin Xin , Dou Chen Chao , Xu Fei
Published: July 2013

The Research of fire occurrence and the law of development, and the prediction of the risk are the key to prevent and extinguish the fire effectively. This paper uses FDS to build the building model and track the production and movement of fire and smoke, combined with the material properties of furniture, walls, floors and ceiling to calculate the growth and spread of fire. Finally, write the data analysis platform FireSim to read and analyze the output data of FDS, and give the fire danger rating, so as to help people prevent fire and reduce disaster.
Fault-Tolerance of Hierarchical Power Management in Data Center
Authors: Li Jian Xiang , Lv Yi Nan , Kong Xiang Zhen
Published: July 2013

Power provision is coming to be the most important constraint to data center development, how to efficiently manage power consumption in the data center is urgent. For solving this problem, we designed the Request-Response Hierarchical Power Management model (RRHPM) for data center and analysed its performance in our latest work. Because failures are quite common in current data centers, in addition to performance, the fault-tolerance is another important metric of power management system. In this paper, we further explore the fault-tolerance of RRHPM for the data center. Numerical results show that the Equal Utilization Strategy has higher fault-tolerance than popular Equal Degree Strategy.
C2C E-Commerce Recommender System Based on Three-Dimensional Collaborative Filtering
Authors: Ai Dan Xiang , Zuo Hui , Yang Jun
Published: July 2013

To solve the special recommendation problem in C2C e-commerce websites, a three-dimensional collaborative filtering recommendation method which can recommend seller and product combinations is proposed by extending the traditional two-dimensional collaborative filtering method. And a C2C e-commerce recommender system based on the proposed method is designed. The framework of the system and the key calculations in the recommendation process are discussed. The system firstly calculates seller similarities using seller features, and fills the rating set based on sales relations and seller similarities to solve the sparsity problem of the three-dimensional rating data. Then it calculates the buyer similarities using historical ratings, decides neighbors and predicts unknown ratings. Finally it recommends the seller and product combinations with the highest prediction ratings to the target buyer. A true data experiment proves the good recommendation performance of the system.
Modeling and Simulation of PWM Converter Based on the PID Neural Network
Authors: Shu Hua , Xiong Sheng Zu , Shu Huai Lin
Published: July 2013

The Phase shifted Full-bridge Zero-voltage Zero-current-switching Pulse-Width Modulation (PS-FB-ZVZCS-PWM) converter is discussed in this paper and the PID neural network is used to be the dual loop controller of the system. The results of the simulation prove that the PID neural network double close loop system has achieved the nice control characteristics which are no overshoot, no static error, fast response, short transition time, good tracking performance.
An Approach for Short Term Traffic Flow Forecasting Based on Fuzzy Logic Control
Authors: Dai Wei Dong
Published: July 2013

In this paper, fuzzy logic control is applied to forecast the short-term traffic flow and traffic guidance. Because of the factors of time correlation and spatial correlation, we construct the short-term traffic flow forecasting model using fuzzy logic control that can handle non-linear plant behavior. In order to find a feasibility way of traffic flow prediction, we deal the combination of time correlation traffic value and space correlation traffic value as the input variables. Considering the real condition, we use triangular and trapezoid membership function to design the belongings relationship. Five fuzzy rules are applied in the control. Last, we use fuzzy logic toolbox to simulate the short term traffic flow forecasting basing on the fuzzy logic control. The system input/output curve result shows that this method can have a good performance for short-term traffic flow prediction.
Analysis of Active Clamp Forward Converter of UAV
Authors: Cao Zhi Wei , Zhang Yi Ming , Zhang Xu
Published: July 2013

The Forward Switch mode power supply is good selection for power supplies of Unmanned Aerial Vehicle (UAV). Compared with the conventional forward converter, there is one auxiliary switch in the active clamp forward converter to recycle the energy stored in the transformer leakage in order to minimize the voltage stress of the main switch. The power system is designed and the operation characteristics of the active switching power supply are revealed by analysis a typical second-order system in this paper. Active Clamp Forward Converter reduce the generation of EMI, the EMC of UAV equipment is greatly improved. The results of the analysis are verified by SPICE simulation.
Fault Simulation of Tanks Sight Based on Optical Parts Fretting
Authors: Zhang Xu Fan , Li Qiang , Yan Xing Peng , Cheng Gao Feng
Published: July 2013

Aiming at the problem of maintenance and it is difficult to find the fault caused by optical parts fretting. By means of mathematical tools to express optical parts imaging laws. With the computer simulation technology, combining with optical fretting theory and practical problems, producting a set of simulation software and showing the influence of optical parts fretting. The results show that the fretting of optical elements influence the imaging effect and firing accuracy. For the maintenance training of universal and serialized sighting telescope, the simulation research provides technical means.
Gird Lagrange Stability Analysis Based on Quasi Periodic Analysis
Authors: Lu Li Fang , Qi Huan , Huang Xun Cheng
Published: July 2013

The Lagrange stability is a new concept in power system stability study. In this paper, an effective method based on quasi-periodic analysis has be presented to analyze the power system Lagrange stability. The Ensemble Empirical Mode Decomposition (EEMD) has be introduced to deal with the trajectory data of power system in the proposed approach. With the EEMD decomposition and linear transformation of the trajectory data, a special constantAcan be accepted. IfAequal to zero, the power system is Lagrange stable, otherwise the power system is not Lagrange stable. The simulation results show the correctness of the method.
Research on Pressurizer Water Level Control in Nuclear Reactor Based on Active Disturbances Rejection Controller
Authors: Xue Yang , Lin Jing , Li Yuan , Feng Jian Biao
Published: July 2013

Active Disturbances Rejection Controller (ADRC) is applied to pressurizer (PZR) water level control system. Pressurizer is very important to the safety and the economic operation of nuclear power plant, and is a highly complex, nonlinear, and time-varying system. A traditional PID regulator is usually adopted to control water level of pressurizer in majority reactors. But there are large overshoot and low stability, and the control effect is not ideal. In order to obtain satisfactory control effects, ADRC is introduced to the water level control of pressurizer in this paper. This nonlinear control strategy is appropriate for the subject which has the characteristics of large-delay and multi-disturbance. The simulink results illustrate that the improvements are significant for its little overshoot, better stability, advanced anti-interference and strong robustness. Therefore, this new method based on ADRC is feasible and effective.
The Simulation of Robot Control Based on CMAC Neural Network PID Control Algorithm
Authors: Yu Jian Li , Di Ya Zhou , Yin Lei
Published: July 2013

According to the problem of nonlinear and uncertainty in robot control, this paper proposes a PID control algorithm based on CMAC neural network model, for the elimination of the influence of uncertainty caused by robot system parameters and external disturbance. The simulation results show that this algorithm can effectively overcome the uncertainties and external disturbance of robot system model, this algorithm has good robustness and stability, its performance is superior to the traditional PID control algorithm.
Development of Virtual Simulation in Manufacturing Industry
Authors: Liu Xin Xiong , Liu Qing Yun , Wang Wei
Published: July 2013

Firstly, the current situation of China and the necessity of importing virtual simulation technologies in production manufacturing were analyzed. And then, virtual simulation, Virtual manufacturing and their advantages were introduced. After that, the current developments of the virtual simulation technology at home and abroad were reviewed. Based on the analyses of the advantages of the current researches, virtual simulation technology existing issues and improving approaches were pointed out. Finally, the development direction was proposed.
Advances in Test Techniques Based on Multifunctional Sting Support System for 8m×6m Wind Tunnel
Authors: Fan Li Tao , Duan Xue Feng , Xue Wei
Published: July 2013

Multifunctional sting support system at high angle of attack is the main way of support for aircraft test in 8m×6m wind tunnel. In recent five years, a series of supporting facility has been developed to improve test efficiency and enhance the finer testing and measuring capability. New developed vibration suppression system can not only enlarge the maximum weight-bearing of the support mechanism, but also reduced the vibratory frequency of a model. Power (motor) control system was modified to adapt to the requirement of 0.2% precision. TG1801 balances were designed and manufactured with high precision and good stiffness. A remote control unit has been applied for a specific aircraft test as model facility to reduce labor intensity and raise test efficiency. Aircraft test efficiency in 8m×6m wind tunnel has been increased gradually and data accuracy reaches the advanced international level through these improvements.
Digital Controller Design for Sense Mode of Micro-Machined Gyroscope
Authors: Wang Long , He Chun Hua , Liu Yu Xian , Liu Da Chuan , Lin Long Tao , Yang Zhen Chuan , Yan Gui Zhen
Published: July 2013

This paper presents one kind of digital closed loop control system of MEMS (Micro Electro-Mechanical Systems) vibratory gyroscope, particularly concentrating on the sense mode of MEMS gyroscope. The controller consists of a sine wave source realized by CORDIC algorithm, multiplication demodulators, some low-pass filters and force feedback rebalance module. Compared with the open loop sense system of gyroscope, the closed loop sense system has larger measurement range and wider bandwidth. Besides, the sine wave source realized with CORDIC algorithm can save hardware resources. The digital system is demonstrated on a PCB with a FPGA on it. The test results show that the measurement range of the closed loop system can be increased to 3 times by the open loop, and the bandwidth can be extended to 262Hz from 27Hz of the open loop system.
Swarm Cohesion Stability Using a Fuzzy Logic Based Attractive/Repulsive Function
Authors: Le Hung Lan
Published: July 2013

In this study, a novel class of swarm robots with fuzzy logic based attractive/repulsive force function is presented. This kind of attractive/repulsive function seems to be more general and natural than other explicit mathematical formulations. It shows that the members of swarm robot will asymptotically form a cohesive cluster in predicted bounded region. Simulation example is demonstrated to validate the theoretical results.
Slid Mode VSC for Aircraft Anti-Skid Braking System with Index Reaching Law
Authors: Fu Long Fei , Li Yu Ren , Tian Guang Lai , Liang Bo , Wang Hong Ling
Published: July 2013

Aircraft anti-skid braking system providing protection for the safety of the aircraft landed by controlling the brake pressure to be maintained slip ratio in best condition. The aircraft anti-skid braking system is hard to control as the nonlinear model of the aircraft dynamics, the uncertainty of friction between the tires and the ground of braking process. With the study of slip ratio and research of aircraft anti-skid braking system dynamics model, the sliding mode variable structure controller is designed. Then index reaching law is adopted to eliminate the system chattering and the performance is analyzed, further more the robustness is strengthen. Simulation results indicate that: the slip ratio follows the optimum slip ratio, the input signal is smooth, achieve the purpose.
Development of Two-Wheeled Balancing Scooter
Authors: Panich Surachai
Published: July 2013

In this paper, the design and construction of two-wheeled balancing scooter based on principle of the inverted pendulum that it must keep an angle of zero degree due to vertical line in time. The mechanical structure, electronic circuit and algorithm are developed to control motors and gyroscope sensor is used as detector of angle error due to vertical line. The mathematical model to describe the dynamic behavior of balancing system is analyzed, which stabilizes the handle angle of scooter in stable position. A basic implementation of the PID controller is conducted to compensate nonlinear behavior.