bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of the Course Resources of Fine Arts Education of University
Authors: Gao Yun
Published: January 2012

As the issuing and implementation of “the outline about curriculum reform of elementary education (trial rule, 2001)”, 18 sets of Course Standards and newly edited textbooks with all types and all courses are experimented on the trial plots for Chinese Basic Education. What normal universities should do to response the curriculum reform with the heaviest efforts and widest area since the establishment of the nation Normal universities is responsible for professional training, the unique characteristics of aesthetics curriculum resources take natural advantage of promoting the development of new courses. The thesis analyzes the curriculum resource status in Arts department, puts up simply the tactics on the development and use of curriculum resources on campus and off campus, and hope that crude remarks may draw forth by abler people.
Research on Sealing Performance of Mechanical Seal for Excitation of Rotating Shaft
Authors: Zhao Wu , Yu Gui
Published: January 2012

In this study, liquid film perturbed pressure equation is derived firstly using a Taylor Series expanding pressure formula. By linear film assumption, the axial stiffness and damping coefficients of the mechanical seal are derived. Then kinematical equation of the rotating shaft-mechanical seal system is established. The research focus on solving response of the rotating shaft-mechanical seal system and leakage of the mechanical seal when the rotating shaft is under different frequencies excitatied or under frequency disturbed in different form excitatied in this paper. The analytical results show that response of the rotating shaft-mechanical seal system can finally be close to the stable state, when excitatied frequency of the rotating shaft is disturbed in different form. But for amplitude of the displace between the stationary ring, rotating ring and rotating shaft occurs mutation point at the time when the excitatied frequency is disturbed, meanwhile the excitatied frequency of the rotating shaft is disturbed in rectangular pulse form or in instant maximum pulse form. It will cause liquid film thickness to happen mutation until the leakage increases and mechanical seal fails at last. The study results show that the sealing performance of mechanical seal and excitatied frequency of the rotating shaft has closely positive correlation. The rotating shaft-mechanical seal system can be optimization design and performance prediction based on the study of this paper.
Automatic White Balance of Digital Camera Based on Global Probability Distribution
Authors: Guo Hui Nan , Cao Jian Zhong
Published: January 2012

The white balance is an important parameter of digital camera which makes a great impact on the application of digital cameras. However, due to the limitations of hardware of digital camera, the output image of digital camera cannot restore true colors of the objects under the different light sources conditions. And existing automatic white balance (AWB) algorithms have many application restrictions, particularly the single color image, the algorithms always failure to adjust. To solve this problem, this paper proposes an optimized algorithm based on the gray world assumption and HSI color model. According to the R, G and B color components probability distribution, the algorithm adjusts the image by using the difference value of color. Experimental results show that our algorithm can adjust images in complex situations; meanwhile these confirm that this method is not only effective, but also has the advantage of easy realization.
The Two Step Mutation Evolutionary Programming Using in Image Segmentation
Authors: Liu Fang
Published: January 2012

Image segmentation is an important task in image analysis and processing. Many of the existing methods for segmenting a multi-component image (satellite or aerial) are very slow and require a priori knowledge of the image that could be difficult to obtain. Furthermore, the success of each of these methods depends on several factors, such as the characteristics of the acquired image, resolution limitations, intensity in-homogeneities and the percentage of imperfections induced by the process of image acquisition. Evolutionary programming(EP) has been applied with success to many numerical and combinatorial optimization problems in recent years. EP has rather slow convergence rates, however, on some function optimization problems. In this paper the new evolutionary programming is proposed to overcome the premature convergence. There are two step mutation in the new evolutionary programming. The first step is responsible for searching the whole space. The second is responsible for searching the local part in detail. The cooperation and specialization between different two step mutation are considered during the algorithm design. The new evolutionary programming can use in image segmentation and the experimental results show the new evolutionary programming is efficient.
Study on Process Integration of Collaborative Commodity Design
Authors: Wang Yan Tao , Zhu Bin , Xing Yi Fei
Published: January 2012

As an important creative design mode, the process integration of the collaborative commodity design (CCD) activity is very necessary to be studied deeply. In this paper, the definition of the collaborative commodity design is proposed firstly based on the collaborative design style and the commercial parts applications. Then, the difference between the collaborative commodity design and the collaborative product design is compared. The process integration model of CCD is described. And the three main process integration of CCD are discussed respectively. The integration of the technology scheme restraints to the economic scheme restraints is achieved by these process integrations in the CCD process.
Simulation and Evaluation of Specific Absorption Rate in Human Body in High Frequency Electromagnetic Fields
Authors: Asmae Lak , Homayoon Oraizi
Published: January 2012

This paper describes the various aspects of biological effects of high frequency electromagnetic fields on the human body. Specific Absorption Rate in human model by the IEC62209-1 standard is simulated and evaluated. Also the effect of change in physical parameter on Specific Absorption Rate is simulated and compared by IEC standard model. High Frequency Field Simulation Structure software has been used for simulations.
The Study on Evolvable Electrical Circuit Design Based on FPGA
Authors: Yu Wen Wei , Chen Zhi Wen
Published: January 2012

The traditional evolutionary algorithm needs a lot of storage and handling ability in embedded logic project. Candidate’s solutions through the population, rather than the probability of vector of save memory and bite string processing. Concise evolutionary algorithm (CEA) is a probability vector based evolutionary algorithm is proposed. This paper proposes a method of realizing the standard FPGA concise evolutionary algorithm with a few changes to improve search powers. A data flow and a block diagram design, this paper describes the show. Experimental results show that the requirements (logical block) need to implement, building processing speed and solution for the power evolvable hardware CEA.
Design and Implementation of E-Commerce System Based on SOA
Authors: Wang Lu Feng
Published: January 2012

Through the in-depth study on a variety of existing E-Commerce system building technologies, in the use of mature and stable JZEE multi-tier architecture, combined with the emerging Web services technology and Web services dynamic combination technology, this paper designs and implements a comprehensive Enterprise-Class E-Commerce transaction platform based Service-Oriented architecture. This design is simple, flexible and strongly scalable, that is, when the business needs and business process changes, the system just needs to be simply adjusted to complete the application software updates, so it has high practical value.
Design of New Pattern Combined Temperature Sensor
Authors: Zhang Jian Jun
Published: January 2012

In this paper, we present an idea about a new pattern combined temperature sensor that makes use of two sensors, one is platinum resistance that have good linearity and stability, the other is semiconductor resistance that have high sensitivity and fast response .We use the output of platinum resistance as measurement and calibration standard, and the output of semiconductor resistance for increment measurement, thus we got a better temperature sensor with both the advantages of platinum resistance and semiconductor resistance.
A Novel High Power Factor Soft-Switching Converter
Authors: Yue Yun Tao , Lin Yan
Published: January 2012

A novel scheme of low power communication power supply with high power factor and soft-switching is presented, a power factor corrector and dc/dc converter of passive lossless soft-switching is based on a ML4803 IC control. DC/DC converter introduces a novel two-transistor forward soft-switching technique, which realizes zero-voltage turn-on and turn-off, with no additional switches. a communication power supply module is developed in this paper. It has the characteristics of rapid dynamic response, high power factor, high efficiency and small bulk ect.
The Technology to Embed the Predictive Control Algorithm into Configuration Control Software at the DCS Level
Authors: Quan Qian Qian
Published: January 2012

The development work and proposes the technique to embed the predictive control algorithm into configuration control software at the DCS level. The thesis presents the technique and its application scheme to control CFBB super-heated steam temperature in a thermal power plant. The control scheme includes that the description of controlled plant characters, conventional control scheme analysis and improved control scheme design. It integrates feed-back and feed-forward DMC with DMC-PID cascade control and nonlinear gain-scheduling compensation for actuator. Satisfactory industrial application results show that such a control scheme has enhanced robustness to the complex process, and better control performance has been obtained.
Design of Wireless Sensor Network Based on PSoC
Authors: Bao Yan Sheng , Yao Wei , Zhang Wei
Published: January 2012

Wireless sensor network integrated sensor technology, embedded computing technology, distributed information processing technology and wireless communication technology etc. It can collect the information of objects in the network. Besides, the quality of wireless sensor network node can directly affect the life span of the entire network and the reliability of its data transmission. This paper discusses the hardware and software design of Parking Lock System in detail, using PSoC as the processor and wireless USB technology.
FE Analysis of Spread in Hot Rolling of Large Rings with Different Sizes
Authors: Wang Min
Published: January 2012

How to effectively reduce spread is an important subject in the area of ring rolling. In the paper, a reliable coupled thermo-mechanical three-dimensional (3D) finite element (FE) model for hot rolling of large rings is developed. The relationship between spread and the equivalent shape parameters of the deformation zone is discussed. Variations of spread with relative reduction Rr during hot rolling of titanium alloy large rings with different sizes are analyzed and compared using FE simulation. The main results reveal that (1) the spread in a ring exhibits an axisymmetric distribution after the first revolution of the ring. (2) the peak spread appears in the inside or outside layer of a ring, and the minimum spread is found in the middle layer. (2) as Rr increases, the spread increases and the end-plane quality of the ring reduces.
S3C2410 Microprocessor Based System for Automotive Slectronic Cruise
Authors: Wang Ke Fei
Published: January 2012

This article is designed based on Samsung's S3C2410 company as the main processor, Cruise system, using CAN bus process communication and exchange, using Real Time Embedded Systems operating system, greatly improving the system running the real-time nature and stability. Microprocessor on the sensor signals collected were processed, as confirmed when the need to open the main cruise control switch, and then to cruise speed up or slow down. Upon completion of desired goals, the disconnect cruise switch, out of cruise, the system also has fault diagnosis, and with diagnostic interface to prepare for maintenance use.
Automated Debugging of Resistance Inflexion of OCXO
Authors: Ma Jian Ping , Wang Bing
Published: January 2012

This paper presents a method of automated testing inflexion of OCXO by computer. It has been greatly reduced the debugging process and production time of OCXO through the configuration consisted by computer software and AVR single chip designing. All the advantages mentioned above contribute to the mass production of OCXO
The Research into the Key Problem of Multi-Channel Video Acquisition and Display System Based on FPGA
Authors: Hu Jian Sheng
Published: January 2012

Aimed at the problem of the embedded multi-channel video acquisition and display system, a new one based on FPGA is put forward. The configuration of the system is given. The principle and key issue is analyzed. Using of the state shift mechanism, t the controlling time sequence signals of TFT-LCD are produced; The synchronization among multi-channel video acquisition is realized by using time-division multiplexing technology; The problem of conflict between reading and writing frame cache is solved through the two SRAM switch; The frames composition technology is applied to accomplish the change from interlaced scanning to progressive scanning. The result of project application shows the virtues of system, such as good effect of acquisition and display, low cost and low power consumption.
Research on the Waveform Synthesis of Electromagnetic Detection Inverter Based on FPGA
Authors: Li Shi Qiang , Liu Guo Qiang , Xia Hui , Li Yan Hong
Published: January 2012

Complex geological conditions and limited launch frequencies are the problems which the geological electromagnetic detection faced in our country. In this paper, we designed two FPGA-based detection of electromagnetic emission source inverter control circuits, one is using a phase-shift and complementary drive signal to expand the load range of electromagnetic emission system; the other one is using waveform synthesis technology to achieve that multiple frequencies could launch at one-time, and this method improves the detection accuracy. Both the two control circuits have a positive role in promoting the performance of electromagnetic detection equipment the development of Geological Survey in China.
Influences of Geometric Factors on Rolling Force and Moment in Hot Ring Rolling of Large Parts
Authors: Wang Min
Published: January 2012

For hot ring rolling of large parts, rolling force and moment are of significance for designing, choosing and optimizing of rolling die and mill. In the study, the average shape parameter of the deformation zone of ring rolling is presented first, and then a reliable coupled thermo-mechanical three-dimensional (3D) finite element (FE) model for the process is developed. Finally, the influences of geometric factors on rolling force and moment during hot ring rolling of titanium alloy large parts are explored. The main results show that increasing the ratio of driver roll radius to idle roll radius or decreasing the average radius of blank is beneficial to a saving of rolling force and moment, while the axial height of blank has a little influence.
The Design of an Image Acquisition System Based on the FPGA
Authors: Zhang Yun Shan , Li Yu Hui , Zhen Jie , Zhang Lei
Published: January 2012

This paper describes one kind of Video collection and transmission System which uses QuartusII and the NiosII embedded development software, based on the FPGA. This design uses the specialized 1,300,000 picture element CMOS camera, Verilog HDL language for the design of video image capture and the transformation and so on we call User Defined Module. The whole system has a good performance on real-time video capture and transmitting.
Design of Networked Dual-Core Parallel Processing Data Acquisition System
Authors: Fan Pan Guo , Zhong Qin , Chen Si Yu
Published: January 2012

Whether the test of free-flight stall/spin can be carried out successfully, it depends on the airborne anti-stall parachute system, the performance indexes of the system are related to the test pilots’ safety directly. There are large numbers of test signals in the system and half of them are transient pulse signals, so it requires high real-time capability and data throughput level. Thus the danger of the Ignition testing experiment, Telemetry Tracking Monitoring is requisite. To satisfy the need of measuring electric parameters of an airborne anti-stall parachute system, a multi-thread real-time DAQ system of multi-task is constructed, using dual-core industrial computer and high-speed DAQ card as its core, LabWindows/CVI as VI software platform. By a method of dual-core parallel processing through OS kernel, system accomplishes multi-channel data acquisition with high real-timing and huge data throughput, and through TCP/IP, ODBC interface, remote measurement and database management is also accomplished. At the last, the system design a modularize software by DLL technology, packaging several functional modules in DLL form. This system implements the multi-thread mechanism and its synchronization, TCP/IP communication and parallel processing under LabWindows/CVI platform. Finally high real-timing and reliability of this system are validated by experiment.
Application in Digital Moving TV by Built-In MCU
Authors: Zhao Guang Sheng
Published: January 2012

DVB-T system is a hi-tech product that integrated software, hardware, mechanism, optics all-in-one. It includes digital television's decoding, error correction, standard compatible, frequency search, DVD servo system, pick-up trace, DVD data stream decoding, driving for TFT-LCD, lithium battery's charge/discharge control, power supply management, different work mode's switch, complex machine structural design and so on. Needs software, Hardware, Structural engineers' cooperation, every function needs muck complex technology support.
Automatic Fingerprint Verification Algorithm Optimized Implemented on Embedded System
Authors: Wei Xian Min
Published: January 2012

This paper introduces a solution that implement automatic fingerprint verification algorithm on embedded system. It described all parts of the system in details, including the hardware designing and software designing. In order to resolve the difficulty of applying image processing to embedded system, this paper presents an effective resolution and it will bring instruction to embedded system designer.
Phase Sensitive Detection Based on FPAA
Authors: Gao Jin Shan , Wang Shi Jie
Published: January 2012

Application of FPAA (field programmable analog array) for the construction of phase-sensitive detector is described. The working principle of the phase sensitive detector is introduced. With software called Anadigmdesigner2, a signal selection circuit, a inverting circuit, a rectifier and a low pass filter circuit are achieved. The simulation of the phase-sensitive detector circuit designed is made. Phase rang from 75º to 115 º, phase errors detected are below ±0.392%.
Dry Sliding Wear Behavior of Fe-Ni-Mo-C-Cr Powder Sintered Structural Steel
Authors: Chen Hua , Sun Hai Ying , Zhao Zhan Kui , Chai Zhi Long
Published: January 2012

Fe-Ni-Mo-C-Cr system powder metallurgy in the as-sintered was investigated on pin-on-rolling wear tester for their dry sliding wear behavior. The morphology of worn surfaces and wear mechanism were analysed by SEM. Results show the hot-forging deformation quenching and tempered considerably decreased the porosity and improved wear resistance, and compare with quenching microstructure, tempered microstructure has high wear resistance and match of strength-toughness. Fe-2.0Ni-0.4Mo-0.5C-0.6Cr alloy presented best wear characteristics. SEM observations of the worn surface revealed microploughing and plastic deformation and crack were the basic dry sliding wear morphology,and oxidative wear and delamination wear are dominant wear mechanism.
Design of the Embedded Video Image Monitoring System Based on B/S Mode
Authors: Wang Qing Hui , Chai Hong Wei
Published: January 2012

Relying on powerful image processing capabilities and special parallel peripheral interface which is based on the ADI Corporation Blackfin561 DSP and using advanced H.264 video compression algorithm under the operate system of the uClinux. The implementation scheme of video image monitoring system based on B/S mode is proposed. By running the web boa server under the uClinux on the BF561 platform, the system realizes the video image acquisition,processing and network transmission.The result shows that the client can see the clearer images through the browser and the system meets the requirements of the remote video monitoring.
Three Dimensional Time, Cost and Quality Tradeoff Optimization in Project Decision Making
Authors: Mokhtari Hadi , Salmasnia Ali , Bastan Mahdi
Published: January 2012

Time, cost and quality are crucial aspects of each project and tradeoff among them is important for improvement of the overall performance of industrial and construction projects. In this paper we suggest that the quality is added into the traditional time-cost trade-off problem (TCTP) and develop a three dimensional time, cost and quality trade-off problem (TCQTP) with some realistic assumptions. To the best of our knowledge this problem has not been extensively treated in literature yet. In order to deal with the suggested stochastic TCQTP, a statistical robust solution method is adapted in which not only the correlations among objectives are considered but also the variance of objectives is minimized. A computational study on an illustrative example is done and the results support the applicability and reliability of the suggested model.
Investigation on Reachable Domain of Satellite with a Single Impulse
Authors: Li Xue Hua , He Xing Suo , Zhong Qin Fang
Published: January 2012

The paper investigates on the reachable domain of generated trjectories after an impulse with fixed magnitude and arbitrary direction applied at any point on the initial satellite orbit. By coalescing simulation analysis and geometric analysis, a method is given to determine the reachable domain of both initial circular and initial elliptic orbit. For generated elliptic trajectories, the present method is a general and feasible method to investigate the reach domain of satellite with single impulse.
Application of Carrier-Wave PWM Scheme on CHB-Based STATCOM
Authors: Li Yi Dan , Lu Wen Sheng , Guo Ming Liang , Liu Hong Yang
Published: January 2012

Two kinds of multiple carrier-wave PWM schemes are analyzed and compared in detail. The phase-shifted PWM method is proved to be suitable to the cascaded H-bridge (CHB) inverter-based STATCOM because of the same device switching frequency and conduction time. More harmonics can be eliminated and device power losses can be reduced. Based on this modulation scheme, a novel dc capacitor voltage detection and balance control is developed. The simulation is performed in Simulink environment and the experiment prototype based on DSP is built. The simulation and experiment results show the correctness and feasibility of the proposed methods.
Planning Strategies for Surface Hardening by Laser Robot
Authors: Liu Li Feng , Yang Xi Chen , Zhang Hai Ming
Published: January 2012

Process planning strategies for surface hardening by laser robot was introduced. It has many characteristics, such as integration, flexibility and environmental protection. According to technology requirement, the path planning and robotic hardening program were accomplished automatically. The FANUC ROBOGUIDE was used to realize simulation. Experiments were carried out to evaluate the application of process planning strategies for laser surface hardening.
Research on the Development of Future Wireless Network
Authors: Shen Qi , Zhao Ying Rui
Published: January 2012

Wireless networks today can be divided into several phases, the first voice communication is based, that is 1g, the second phase, where we are in stage-based data traffic. In the third phase, will be mainly dominated by video, the need for new ways to optimize the network in order to prevent saturation. The future is 4G era. Now, based on 3G mobile communication technology has been successful in the global implementation of standardized and up. 4G standards battle has been engaged in fierce. For now it seems 3G technology in the WiMAX and LTE will be strong competitors in the future 4G standards. In this paper, we will talk about the 4G technology standard, WiMAX and LTE the basic characteristics of the key aspects of technology and application prospects of WiMAX and compare LTE and the development of future wireless networks.
A Comparative Analysis of the Legal Status of Renewable Energy in Iran and other Countries
Authors: Mostofi Mehdi , Ahanrobay Noushin
Published: January 2012

Iran is the land of miraculous energy types including wide range of renewable types of energy. In spite of these potentials however, little use has so far been made of these energy types mainly due to unfamiliarity and lack of scientific and technological dominance, and also the absence of necessary funds for conducting respective projects and plans. The most important reason behind this negligence is the lack of an independent and comprehensive law for clean energies, which serves as a firm support for development and usage of new energy types while possessing adequate implementation guarantee. Once formulated, the law becomes indispensable and is expected to remove and eliminate all the existing defects in the society and help improve the international policies and programs aimed at the global sustainable development using clean energies. Since the existing clean energy laws in Iran are so scattered and just imply this important subject in one or two simple clauses, this article seeks to identify the shortcomings and determine the need to formulate an independent legal framework, which responds to the current social needs, via a comparative study of the laws and regulations regarding clean energies in Germany, Italy, China and Iran, which indicates the legal status of the issue in these countries.
A New Technique for Roof-Top Soil-Less Cultivation of Vegetable Sprouts
Authors: Hua Yan Bin , Xin Yan Wei , Yang Ren Mei , Hua Guang Sheng , Xu Zhi Qiang
Published: January 2012

The author designed a new device for growing vegetable sprouts and ornamental plants by combining greenhouse design and soil-less cultivation technology together with houses construction, aiming at saving arable land and energy by rapidly producing sprouts or flowers through vertical cultivation by installing the new device on the roof-top of houses in rural areas. Taking into consideration of design ideas, technological process, and the selection of raw materials, along with their practical value and future prospects, the author construct a double-layered, vertically cultivated vaulting greenhouse. As a result, the use of soil-less cultivation techniques on the roofs of houses in the Chinese countryside shows promise as a potential solution to deal with the shortage of arable land. This new cultivation technique may be more effective in promoting agricultural productivity and sustainable development of the economy and society since it can take full advantage of available resources in order to achieve a more economical and intensive use of land. There are three major benefits with roof-top agriculture: First, by using greenhouses located on the tops of roofs, a grower can maximize his utilization of sunlight. Second, roof-top agriculture doesn’t require any additional arable land. Third, the vegetables can be planted all year-round. The life circle of crops was shortened and productivity was promoted. The application of the technology will significantly increase economic efficiency and practical value of the idle roof-tops of houses in rural and suburban areas.
Organic Piezoelectric Energy Harvesters in Floor
Authors: Bischur E. , Schwesinger N.
Published: January 2012

The design, fabrication and testing of piezoelectric energy harvesting modules for floors is described. These modules are used beneath a parquet floor to harvest the energy of people walking over it. The harvesting modules consist of monoaxial stretched PVDF-foils. Multilayer modules are built up as roller-type capacitors. The fabrication process of the harvesting modules is simple and very suitable for mass production. Due to the use of organic polymers, the modules are characterized by a great flexibility and the possibility to create them in almost any geometrical size. The energy yield was determined depending on the dynamic loading force, the thickness of piezoelectric active material, the size of the piezoelectric modules, their alignment in the walking direction and their position on the floor. It was possible to generate up to 2.1mWs per pulse with loads of about 70 kg using a specific module design. An increase of the energy yield at higher loading forces and higher thicknesses of the modules is possible in general. Furthermore a test floor was assembled to determine the influence of the size, alignment and position of the modules on the energy yield.
Parameterization Structural Design and Three-Dimensional Entity Modeling of Brake by Wire System Based on Pro-E
Authors: Chu Chang Bao
Published: January 2012

Parameterization design was applied to actuator structural design and three-dimensional entity modeling of brake by wire system. Based on pro-engineering software environment, motor driving entity model of brake by wire system was established. Motion transformation device, force booster device, cylindrical gear decelerate device were included. According to relative motor parameters and structural function of the equation, structural design of motion transformation device, force booster device and cylindrical gear decelerate device were carried on. Under Pro-E entity modeling platform, three-dimensional entity model of brake by wire system was established.
Security Mechanism against Flood Attacks in Ad Hoc Networks
Authors: Wang Xi Jie , Hu Shun Yi
Published: January 2012

The most challenging work in ad hoc networks now is to prevent attacks. This paper labors a security machine against flood attacks in a typical protocol of AD HOC network AODV. In this mechanism, we include buffer management and credibility management.
A New Algorithm for Image Copy-Move Forgery Detection
Authors: Hou Dong Mei , Bai Zheng Yao , Liu Shu Chun
Published: January 2012

A new image forensics algorithm based on phase correlation is proposed to detect image copy-move forgery. Phase correlation is computed to obtain the typical distribution of correlation value and then minimum variance method is applied to determine the pulse diagram. The spatial offset between copied portion and pasted portion is estimated according to the pulse position, thus the copy-move region can be quickly located. Experimental results indicate that this method is not only implemented easily, but also achieve an effective and accurate location for small tampered areas. With this method, detection accuracy is guaranteed and application scope of the algorithm is extended simultaneously.
Nonlinear Robust Adaptive Control for Static Var Compensator Based on Backstepping and Dissipative System Theory
Authors: Zhang Lei , Zhang Ai Min , Han Jiu Qiang , Zhang Hang
Published: January 2012

Based on adaptive backstepping nonlinear control scheme and dissipative system theory, the robust adaptive nonlinear controller is designed for single machine infinite bus (SMIB) power system with static Var compensator (SVC), which conquers the obstacle of relative degree one of passivity feedback scheme. During the procedure of designing controller and parameter estimator, the uncertainties of disturbances and the damping coefficient are taken into account; therefore, the designed controller has the ability of robustness and adaptive estimation. The globally uniformly boundness of all the states in the system and the asymptotical stability of the system errors are verified by the theories. Simulation experiments show that not only the transient stability of the SVC power system is guaranteed, but also the robustness performance is significantly improved even with disturbances.
Indeterminacy Analyzing of the Quantum Particle Swarm Analog with the Gaussian Distribution and its Solving
Authors: Bai Xue Mei , Zhang Fu Chun
Published: January 2012

The paper analyzed the quantum-behaved particle swarm optimization with Gaussian distribution which can reduce the identification error of system. However, when the coefficient of the random number probability is changed, the different result is obtained and the result is uncertain. The paper identified off-line the friction model of a servo system with the method and contrasted the result. At the end of the paper, the indeterminacy of the algorithm is solved.
The Research and Development of Automotive Engine Test Platform
Authors: Qu Li Rong , He Dan Ya
Published: January 2012

This article describes the vehicle based on virtual instrument engine control system research and development of the experimental platform. Virtual instrument technology combined with artificial intelligence inference mechanism for the establishment of a virtual instrument based on the engine electronic control system testing and fault diagnosis system, to achieve the electronic control engine system sensors online test, waveform analysis, data storage, replay and failure diagnosis.
Vague Pattern Recognition Algorithm and its Irrigation System
Authors: Zhang Fu Jin , Ma Yu Chun , Wang Hong Xu , Zhang Qing
Published: January 2012

Definition of conversion from a single value data to the Vague value data is given; two conversion formulas from a single value data to the Vague value data are given; a similarity measure formula between Vague sets are given; Vague pattern recognition algorithm is given. The algorithm is applied to irrigation system design, application examples show that theVague pattern recognition algorithms and formulas are all useful.
Blind Digital Watermarking of Integer Wavelet Transform
Authors: Zhang Ding Hui , Wang Yu Ping , Zhang Jian Wei , Xu Sai Sai , Li You
Published: January 2012

In the light of JPEG compression attack, a blind digital watermarking algorithm of integer wavelet transform is proposed in this paper. Before the watermarking image is embedded, the cover image is decomposed by integer wavelet transform, and the binary watermarking image is scrambled to enhance its security. The scrambled digital watermarking is embedded into the cover image by means of modulo operation and modification of the integer wavelet transform coefficients of the cover image. The digital watermarking is extracted only by means of the modulo operation of the integer wavelet transform coefficients of the watermarked image and threshold ruling, and not depending on the original cover image. The experiments have shown that the blind digital watermarking algorithm can strongly resist JPEG compression attack.
Research on Statistic Characteristics of Fluctuations in China Stock Market
Authors: Li Jing Rong , Fu Chun Juan
Published: January 2012

It is well known that the psychology of market participants have important influences on stock market price trend, but information on this level is far from detail for market participants. When facing different stocks to determine their investment configurations, market participants join the irrational behavior on considerations of stock market price trend; will surely help him choose to invest better or more effective risk management. As the start of a new exploratory study, the paper based on statistic regression model as the main tools, selected several plates with significant fundamental differences in Chinese security market as research object, concentrates on exploration the effect of p/e ratio and fluidity indexes on market participants psychology, at the same time inspects if these effects exist plate differences. The method is also applicable to other fundamental factors.
Product-Image Classification with Support Vector Machine
Authors: Jia Shi Jie , Zhao Jian Ying , Yang Yan Ping , Xiao Nan
Published: January 2012

SVMs with kernel have been established with good generalization capabilities. This paper proposed a supervised product-image classification method based on SVM and Pyramid Histogram of words(PHOW). We tested several kernel functions on PI100 (Microsoft product-image dataset), such as linear, Radial Basis, Chi-square, histogram intersection and spatial pyramid kernel. Experimental results showed the effectiveness of our algorithm.
The Calculation of Earth Capacitance Based on Least Square Method
Authors: Ha Heng Xu , Liu Xiao , Hu Xi Tong
Published: January 2012

The grounding capacitive current is one of the most important parameters of ungrounded neutral system. Usually this parameter is obtained with the method of additional capacitor or metal grounding. However, the former is complicated and the additional capacitor has negative effects on measurement results, and the later is dangerous when used in testing. In view of that, the paper proposes a new method to calculate grounding capacitance current based on the data of single-phase-grounding faults in power system with indirectly earthed neutral. This method reduces the error by using the least-square method .The ATP simulation results show that this method is accurate basically.
On-Line Evaluation of Voltage Transformer Accuracy
Authors: Yang Xiao Hui , Yan Dong , Xie Kai , Wang Yong
Published: January 2012

The accuracy of voltage and current transformer (VT and CT) is a key factor in electric power metering. Ratio error and phase displacement calibration of VT and CT is traditionally carried out off-line. As a result of the expansion of the power grid and the increasing metering quality requirements from customer side, the off-line metering of VT and CT becomes more and more difficult. In this paper, a VT accuracy on-line evaluation system is developed, which can evaluate the accuracy of VT under on-line operating status. The principle and adopted key techniques in the development of the VT accuracy on-line evaluation system is introduced. Some on-site test results are also presented and analyzed as application demonstration.
Calculation of Iron Loss in Large Hydro-Generator under Non-Load
Authors: Li Wei Li , Liang Da Wei , Zhang Yu
Published: January 2012

Taking 1000MW air-cooled hydro-generator as an example, the solving region and mathematical model are given. Based on the theories of electromagnetic field, the stator iron loss of large generator under non-load is studied. Considering the structural characteristics of generator, the iron loss was calculated by using magnetic circuit method and the finite element method, respectively. First, the iron loss in generator stator is calculated basing on the theory of electromagnetic field. Then the steady state and transient fields were used to calculate and analyze the 2D electromagnetic field by finite element method. And the exact value and distribution of iron loss are obtained. Last, we obtain some useful conclusions through comparing the iron loss calculated by the two methods above. That will provide a theoretical basis for further study of the physical fields of new generation giant hydro-generators.
Robust Variable Structure Control for Compound Active-Clamp Three-Phase PFC Converter with Soft Switch
Authors: Guo Xin , Ren Hai Peng
Published: January 2012

Compound active clamping three-phase Boost PFC converter with soft-switch has a good potential application because of its high power factor, high efficiency and simple structure. The mathematical model of this converter is analyzed. A variable structure control method with the robustness item is proposed for the control of this converter, in order to overcome the shortcoming of the existing method, when the converter parameters changes. The time-varying boundary layer is used to smooth the control discontinuity. Simulation is performed using PSIM and MATLAB hybrid simulation method. The results indicate that the proposed method possesses not only better transient and steady state performance under the nominal parameters, but also better robustness under the parameter perturbations, compared with the traditional PI control and the former variable structure control without the robustness item.
Method of Wavelet Denoising in Harmonic Detection
Authors: Cao Ying Li , Yang Yong , Yang Guang
Published: January 2012

Harmonic detection is an important step in grid harmonic status evolution and suppression measures implementation. While it’s accuracy is interference to the noise in the power grid. The different characteristics of signal and noise in the wavelet transform are proposed firstly, and the method of soft threshold de-noising based on wavelet multiresolution is analyzed in the paper. Using the method, the noisy harmonic signals in the power grid are processed and the de-noisy signals are analyzed by Fourier Transformation (FT) to obtain the contents of each harmonics. The simulation results show that the harmonic containing rate is close to the original signals after de-noising by WT. That is the method reduces the interference of noise and the accuracy of harmonic detection is improved.
Detection of Color Indicators under Complex Circumstances
Authors: Fang Lu Ping , Wei Yuan Jie , Lu Fei
Published: January 2012

A color indicator detection algorithm under different illumination conditions is proposed. First, based on the similarity between consecutive video frames in channel L of Lab color space, background image can be determined. Differentiation of a frame and the background can identify the motion region, and thus the search area for the color indicator is greatly reduced. Second, the convex hull of motion region is specified and sampling is taken within it. By assigning the weight, seeds can be determined using clustering method. Finally, region growing is implemented by applying Bayesian decision with minimal error ratio. The method is applicable to more different conditions and produces better results compared with traditional color-threshold vector method.
Condition Identification of Bolted Joints Based on Autoregressive Model
Authors: Zhang Yan , Zeng Guo Ying , Zhao Deng Feng , Li Ming Yan
Published: January 2012

The difference signals, which between upper and lower shells of flange bolted joints structure, was applied to establish the autoregressive model for system condition identification. Firstly, an AR model is built by difference signals. The established AR model is used as a filter to process the difference signal in test state under the same condition and output residual series. Then the statistical parameters, such as Itakura distance, skewness, kurtosis and variance, are used to handle residual series. The results of experiment show that Itakura distance is a useful eigenvalue to identify the bolted joints condition.
A Feature Extraction Strategy Based on Multiple Color Information
Authors: Han Yan Bin , Zhang Geng Shi , Li Jin Ping
Published: January 2012

In this paper, a feature extraction strategy based on multiple color information fusion was proposed. Firstly this method started with analyzing the transform formula of color space, which transform was mainly thinking about RGB color space to other color spaces. Secondly by analyzing the characteristic of every color space in describing the actual color information, the advantages and disadvantages of every color space were showed. Thirdly through above conclusion, the algorithm which extracted the target feature only using single color information was defective, and then the strategy based on multiple color information fusion was proposed. Lastly the detail fusion strategy was given, which fused the probability distributed information of multiple color into the last probability distributed information as the target feature. The feature extraction strategy in this paper is verified by the camshift algorithm. The results show that the multiple color information fusion can improve the tracking performance of moving target.
Effects of Water Height and Floodgate Distance on Flow Pressure of Flood
Authors: Xiao Shi Yun , Si Yi Qing , Yue Bin , Yang Liu Juan , Ge Xue Li , Zhu Li Xin
Published: January 2012

Rural building models were tested to research the action of flood on buildings, three different water heights with 0.6, 0.9 and 1.2 meters were applied to this experiment to simulate small-scale, medium-scale and large-scale flood respectively. The model was placed at 3, 6 and 9 meters far from the floodgate. In this paper, the effect of the water height and the distance between model and floodgate on the values and distributions of the flow pressure are studied. Some conclusions can be drawn: the flow pressures, force and bending moments of the flow surface increase with the increasing water height and the relationship are approximately linear; the values and distributions of the flow pressure are independent of the floodgate distance and the force and bending moment of the flow surface increase with the distance from 3 meter to 6 meter but decrease with the distance from 6 meter to 9 meter.
Research on the Fault Location of 35kV Distribution Line
Authors: Yan Feng , Xu Ru Jun
Published: January 2012

A kind of C-type of traveling wave location method is proposed in this paper. After the single phase grounding fault happened, inject a high voltage narrow pulse signal into the fault phase line and the normal one respectively, collect the reflected signals at detection point, make this two signal waveforms subtract and find the corresponding time of fault point characteristic wave, calculate the fault distance by using location equation. Conduct wavelet packet decomposition and reconstruction on the waveform subtraction signal, judge the fault section by comparing energy changed values of node characteristic waves.
Based on Fuzzy Logic Control of Recovery of the Method Research of Maximum Power Point Tracking
Authors: Dong Bo , Li Yan , Wang Sheng Hui
Published: January 2012

It is very crucial to find a suitable tracking method, because improving the efficiency of the maximum power point tracking will improve the efficiency of tracking improved solar energy utilization to the present generation system. Based on fuzzy logic control of recovery of maximum power point tracking is enough to a system for solar energy utilization. Based on MATLAB/simulink software, comparing the fuzzy logic controller of different dimensions and different simulation emulated, this article find each factor to influence the tracking accuracy and speed, and it will provide the basis for different systems.
Research of the Wireless Distributed Test System Based on WLAN
Authors: Qiu Chang Quan , Qin Hong Lei
Published: January 2012

It’s absolutely necessary to create distributed test system for distributed UUT. However, distributed test systems constructed by the existing test bus products such as GPIB, VXI, PXI and LXI are all wired communication network based, which cannot satisfy certain test requirements. In this paper, on the basis of research about wireless communication network expansibility of modern test instrument, the thesis puts forward wireless distributed test system based on WLAN, introduces topology architecture, MAC layer protocol and physical layer technology, and presents some solutions on the key issues such as real-time, clock synchronization and trigger synchronization, etc. As for clock synchronization, the paper describes synchronization mechanisms based TSF, TINY/MINI-SYNC algorithm and IEEE 1588 precise time protocol, and for trigger synchronization it presents methods based on command, event and time, etc.