bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Bayesian for the Situation Assessment of Sea-Battlefield
Authors: Yu Yong Tao , Ding Ying , Ding Zheng Xi
Published: August 2013

The sea-battlefield situation is dynamic and how efficient sea-battlefield situation assessment is a major problem facing operational decision support. According to research based on Bayesian networks Sea-battlefield situation assessment, first constructed sea-battlefield situation assessment Bayesian network; followed by specific assessment objectives, to simplify creating sub Bayesian assessment model; once again based on Bayesian network characteristics to determine each node probability formula; finally, according to the formula for solving the edge of the probability and the conditional probability of each node, sea-battlefield situation assessment.
Research on Motion Capture Instruments in Sports
Authors: Luo Qi
Published: August 2013

Motion capture Instruments was a kind of high technology equipment that was used for measuring accurately the motion condition of moving objects in 3D space. Motion capture Instruments applied in physical training could help coaches observe and monitor the athletes' techniques from different perspectives, and obtain many motion parameters data of specific technical action and physiological and biochemical indexes data, and then statistic the law of motion, so as to provide standard technical guidance for scientific training. The concept of motion capture, the principle of motion capture, the classification and characteristic of motion capture were introduced in the paper.
A Novel Resonant Tunneling Diode Based on AlGaAsP/GaAs and its Circuit Level Design
Authors: Wang Qi , Li Yang , Du Si Dan
Published: August 2013

RTD (resonant tunneling diode) is a nonlinear device in nm scale level and operates at ps time level which is promising to be used into integrated circuits in the coming years. J.N.Schulmans physical model has beenproven to be suitable to emulate the device accurately. In this paper, a novelRTD based on new material structure is proposed which could reach a relative high PVCR (peak-valley-current-ratio). Then NFP (Nonlinear Fitting based on Physical model) method which is suitable to calculate the parameters for Schulmans physical model more quickly is proposed. At the end of paper the SPICE model of the proposed RTD is proven that it could emulate the RTD device, and shows its application ability in high frequency oscillation circuit.
Segmentation on the Key Structures of the Fundus Digital Image
Authors: Yang Chun Lan , Yuan Ye , Liu Bing , Xue Yan Qing , Wu Shui Cai
Published: August 2013

Fundus abnormalities were usually diagnosed by clinical ophthalmologists using the equipment like ophthalmoscope, which was influenced by complex method, subjective fault and low efficiency. Fortunately, fundus can be shown in the key structures of the fundus digital image. Hence, it is necessary to develop a computer-aided fundus image processing system as a tool to assist in the diagnosis diseases. Algorithms were proposed including the pre-processing such as contrast enhancement and spatial filtering, binaryzation, morphology, boundary extraction and skeleton extraction. This paper preliminary summarized the key technologies of segmentation on the structures of optic cup, optic disc and blood vessel. Experiments were performed in MATLAB. Automatic algorithms were evaluated to be able to detect the key structures of the fundus digital image. It is expected to be applied in computer-aided fundus image processing system.
Flexible Manipulator Control Based on Singular Perturbation Theory Study
Authors: Zeng Ping Lin , Wang San Xiu , Qiu Ji Jian , Ma Shou Ren , Wan Xiao Fei
Published: August 2013

Aiming at the problem of tracking the reference trajectory and suppressing the beam vibration for flexible manipulator, this paper separated the system of flexible-link manipulator into slow subsystem and fast subsystem two different time scale subsystems based on singular perturbation theory and proposes a simple composite control algorithm. For the slow subsystem, a sliding mode controller is employed to track the desired trajectory, while optimal controller is used to stabilize the fast subsystem to suppress the vibration. Finally, the simulation results demonstrate the good performance of the proposed control strategy.
Hybrid Force-Position Control Three Fingers End Effector
Authors: Jiménez Vladimir Prada , Avilés Sánchez Oscar Fernando , Mauledoux Mauricio M.
Published: August 2013

This paper describes the implementation of a hybrid controller to an end effector of threefingers, each finger with two degrees of freedom (2 DOF). Since the mobility of each phalanx showsthe workspace by finger. Modeling is presented which includes the kinematics and dynamics offector and implementation of force-position hybrid controller. Simulations are presented to validatethe behavior of the finger and the controller in Matlab Simulink.
Performance Analysis and Improved Design on the Compliant Micro-Displacement Amplification Mechanism
Authors: Liu Qing Ling
Published: August 2013

By analysing the structural characteristics of the compliant micro-displacement amplification mechanism and the examples of the compliant micro-displacement amplification mechanisms with different link length and link angel, the combined compliant structure formed with flexure hinges and link is important component, the length and the angel of the link affect the thickness ratio and length ratio of the combined compliant structure, which plays a key role in amplification of the mechanism. The design method is proposed aiming at improving the amplification, which is used in the improved design of the compliant micro-displacement amplification mechanism. The amplification analysis of the improved mechanism is done, which proves the validity and rationality of the improved design .
A Study of the Peak Boundary Method and Effect Evaluation Based on NaI(TI) Detector for γ-Spectrum Analysis
Authors: Yang Yao Zong , Fang Fang , He Jian Feng , Ran Jun Jun
Published: August 2013

In order to accurately analyze the result, which comes from quantitative and qualitative detection based on gamma energy spectrum of NaI(T1) detector, peak boundary has become one of the main factors which influence the spectrum analysis. By implementing some common boundary determining algorithms in the Matlab such as simple comparison method, derivative method, symmetry zero-area method, the full width method and gaussian function fitting method, as well as comparing effectiveness among those algorithm, priority of those boundary algorithms is evaluated. At the same time, because the boundary determining algorithm based on traditional gaussian fitting is not ideal, the new boundary determining algorithm based on the least squares fitting of gaussian function with weighting factor is proposed. The practice verifies that this method is stability and can obtain preferable convergence result in boundary determining of unimodal or combination peaks.
High Performance Data Processing Pipeline of Chinese Solar Radio Heliograph
Authors: Zhang Fan , Wang Feng , Wang Wei , Dai Wei , Deng Hui , Ji Kai Fan , Yan Yi Hua
Published: August 2013

The Chinese Solar Radio Heliograph (CSRH) is a new generation radio heliograph would produce more than 4 terabytes data every day. As a aperture synthesis telescope, CSRH is facing the challenge of processing and storing such a vast data. Pipeline system is the key issue of data automatical processing for CSRH. In this study, to push the development of CSRH, we present a framework of high performance data processing pipeline system for saving and processing real-time observation data. The related techniques of pipeline software are presented in detail including raw data acquisition, UVFITS file, data calibration, parallel computing and data publication. The pipeline has been deployed and has played an important role for the development of CSRH.
Research on Investment Risk Assessment of Eco-Materials Industry
Authors: Jin Hong Xia , Yao He Ping , Yu Jie
Published: August 2013

With the rapidly deteriorating of ecological environment and depletion of resources, construction investment of eco-materials industry is gradually increasing , so the investment risk assessment has become a hot research problem at present. In this paper, a new investment risk assessment system for eco-materials industry is presented, which combines rough set approach and support vector machine (SVM). It is different from traditional statistical methods. We can get reduced information table by rough set, which implies that the number of index and qualitative variables is reduced with no information loss by rough set approach. And then, this reduced information is used to develop classification rules, and SVM is trained to infer appropriate parameters. The result of the positive research indicated that this system is very valid for investment risk assessment of eco-materials industry and it will have a good application prospect in this area.
Computer-Assisted Percutaneous Renal Access Using Intraoperative Ultrasonography
Authors: Liang Sheng , Sheng Xin Zhi , Zhang Li Mei , Cao Bin
Published: August 2013

This paper develops an ultrasound-based surgical navigation system for percutaneous renal intervention. The proposed system integrates preoperative magnetic resonance (MR) planning with intraoperative ultrasonography (US) slices, where the MR imagery is registered to the calibrated US data. The interventional punctures can be performed under a visualized guidance interface. We describe this navigation system in details and evaluate the navigated intervention via a phantom model.
Compressed Sensing Trilinear Model-Based Angle Estimation for Bistatic MIMO Radar
Authors: Zhang Xiao Fei , Li Jian Feng , Zhou Ming , Ben De
Published: August 2013

In this paper, we address the transmit angle and receive angle estimation problem for a bistatic multiple-input multiple-output (MIMO) radar. This paper links MIMO radar angle estimation problem to the compressed sensing trilinear model. Exploiting this link, it derives a compressed sensing trilinear model-based angle estimation algorithm, which can obtain automatically paired two-dimensional angle estimation. The proposed algorithm requires no spectral peak searching or pair matching, and it has better angle estimation performance than conventional algorithms including estimation of signal parameters via rotational invariance techniques (ESPRIT) algorithm. Simulation results illustrate performance of the algorithm.
Research on Real-Time Laser Range Finding System
Authors: Jia Fang Xiu , Yu Ji Yan , Ding Zhen Liang , Yuan Feng
Published: August 2013

Phase shift laser range finder, as a large-scale, high-precision measurement method, is widely used in industrial and military fields. The traditional laser range finder can not meet the need of real-time, high resolution measurement because of its low anti-jamming capability and time-consuming measurement. Owing to this, multi-channel transmitting and receiving system for phase shift laser range finder based on parallel DSP was designed. Multi-frequency modulation laser can be transmitted and received at the same time, improving the measurement speed and avoiding the wrong data fusion because of target moving. The distance was got by measuring the phase difference between the measurement signal and reference signal, and the Doppler velocity of the target is got by measuring the measurement signals frequency, The measurement signals reference signals were acquired by parallel AD convertors, the phase difference between them was calculated adopting all-phase FFT(apFFT). A new frequency correction method was proposed according to the amplitude spectrum acquired by apFFT, Amplitude spectrum is expanded into Taylor series and the correction value of frequency is calculated by relationship of spectrum lines. Monte Carlo simulation results proved that the new frequency correction method had higher resolution and better stability than Rife method and centro-baric method. The experiments is implemented on a precision guide of 3m-long, on the condition that the sampling frequency of AD converter is 937.5KHz, the apFFT transform point number is 4096, distance and velocity results can be obtained each 10ms, experiments prove that the distance measurement standard deviation better than 0.09mm and the velocity measurement standard deviation better than 0.022m/s are obtained. The system can meet the need of high accuracy ,real-time distance measurement of moving target.
Circuit Design and System Error Analysis Based on MR / GPS Combination Measuring Projectile Roll Angle
Authors: Cao Peng , Wang Xiao Ming , Jia Fang Xiu , Wu You Long
Published: August 2013

In the control process of trajectory correction projectile, a real-time accurate measurement of projectile roll angle information is required. Geomagnetic and GPS measurement principle is applied for the establishment of the projectile measured roll angle combinations mathematical calculation model, the designing of MR and GPS measuring circuits, and derivation of the singular points of the system and error resolution type. Numerical simulation methods are applied to verify the location of singular points of the combination of measurements and the linear spline combination of interpolation method of compensation the position of the magnetic vector error and the ellipsoid fitting calibration algorithm compensate for magnetic measurement error. The geomagnetic error has less effects on the combination of measured roll angle error, while the pitch angle and yaw angle error has greater impact on the roll angle error. Remove the singular point area, projectile roll angle error is less than 2°when measured by the combination of MR / GPS .
A Software Application for Smart Home Energy Management System
Authors: Wang Ji Dong , Dai Jia Qiang , Sun Zhi Qing , Kong Xiang Yu
Published: August 2013

A cross-platform software application was developed to manage energy generation and consumption intelligently in smart homes. The system model consists of domestic loads, household distributed energy resources and an energy storage component that supports scheduled charging/discharging. The software deals with all these electrical devices as well as their energy information, based on which real-time conditions are presented to the resident and the history can be queried. Whats more, the application fulfills kinds of energy profiling and pricing-related optimization on account of demand response, resulting more monetary benefits and comforts. The software interacts smartly with energy owners by graphical user interface (GUI) and enables an intelligent electricity usage pattern in the context of smart power consumption within the framework of smart grid.
Study on Imaging Algorithm for Stepped-Frequency Chirp Train Waveform
Authors: Wang Liang , Shang Chao Xuan , He Qiang , Han Zhuang Zhi , Ren Hong Wei
Published: August 2013

A range profile synthetic algorithm of the stepped-frequency chirp train waveform is designed to obtain HRRP (High Resolution Range Profile) in this paper. Based on waveform model, grating lobes restraining method is proposed with the help of autocorrelation function. Due to the matched filter operation, image energy spill over the close range bins, which causes “ghost images”. Set parameters of inner pulse bandwidth, stepped frequency and chirp compression envelop sampling frequency properly, and then carry the synthetic algorithm, the “ghost images” are restrained. All of the results are validated by simulation.
Micro-Ohm Resistance Measure System Based on LabVIEW
Authors: Tian Tian , Zhao Xu Min , Zeng Li Na , Tao Yu
Published: August 2013

According to the critical issue of accurate measurement of small resistance in the field of electronic measurement, the micro-ohm resistance measurement system is designed based on LabVIEW. It consists of two parts: hardware and software. The hardware is composed of AC constant current source, reference signal source, low noise amplifier, data acquisition card, computer etc.; The software consists of man-machine interface program, measure and control program and data processing program. The system based on virtual instrument cross-correlation detection technology achieves the effective measurement of micro-ohm resistance. It is an automatic measuring system with a flexible and convenient programming, simple and accurate measurement, high resolution and stable performance.
The Reverberating Chamber as Emulator of Radar Echo Propagation Environment
Authors: Wang Hao , Han Zhuang Zhi , Gao Jan Dong , Wang Xue Lei
Published: August 2013

For testing the quality of radar echo propagation, the reverberating chamber electromagnetic environment is classified, the quality of radar echo propagation environment emulation is estimated by the parameter S, the Rice factor K is compared with the parameter S, the test result illustrates that the reverberating chamber can be used as emulator of radar echo propagation environment and as emulator of the base of radar electromagnetic environment.
Influence of Injection Molding Process Parameters on Sink Marks of Injection Parts Based on Moldflow
Authors: Bai Ling , Zhang Hai Ying , Liu Wen
Published: August 2013

Moldflow software was used to obtain the best gate location and count. Influence of injection molding processing parameters on sink marks of injection-piece was studied based on orthogonal test. The effects of different process parameters were analyzed and better process parameters were obtained. Results of research show that decreasing melt temperature, mold temperature, the increasing injection time and packing pressure can effectively reduce the sink marks index.
The Method of Eliminating Banded Structure and the Effects of Banded Structure on the Transverse Properties in 20G Steel
Authors: Wang Bin , Hu Hong Mei , Zhou Cui
Published: August 2013

The transverse properties were inferior to the longitudinal properties for the existence of banded structure in 20G steel. In order to eliminate the banded structure and improve the transverse performance of 20G steel, different heat treatment processes were adopted. The results showed that conventional normalizing could reduce the banded structure and refine the grain sizes. When 20G was heated with 10°C/min heating rated and then held at 920°C for 2h, the banded structure in the steel was almost eliminated and the microstructure was homogeneous with fine grain size, the strength increased by 14%. The non-metallic inclusion and carbide in the microstructure leaded to stress concentration and separation with the base metal. To some extent, heat treatment can improve the distribution and form of non-metallic inclusions.
Control Research of Three-Axis Turntable Based on Neural Network Inverse System
Authors: Hu Zhu Bing , Wang Yan Hua
Published: August 2013

For the nonlinear coupling characteristics between three axes of the three-axis turntable, a method which combines the inverse system method and Neural Network (NN) has been put forward. This method realizes linearization and decoupling of three-axis turntable and solves the defect of difficult to realize precise decoupling with inverse system method when the model of three-axis turntable is inaccurate. Simulation results show the feasibility of the method and also good robustness and resistance.
Machining Precision Research for Two WEDM Processes
Authors: Li Xiao Jing , Hu Yan Hui
Published: August 2013

Plenty of round holes or especial holes distributed in measuring device and mold component with higher positional requirement, in general, are formed in WEDM technology. In the process of WEDM operation, whole holes with high requirement should be finished in one time, which can avoid of positional error and enhance the positional precision effectively. Investigate into the geometrical tolerance and present in an improved process. This process can both suitable for WEDM-HS and WEDM-LS.
Network Instrument of Harness Based on Embedded System
Authors: Lu Sheng Li , Liu Mei Ling , Gao Feng You , Li Min
Published: August 2013

This paper designs a universal intelligent wiring harness tester with the Cortex-A8 processor and embedded ARM-Linux operating system as the core, which is able to detect and diagnose the fault of harness including dislocation, short circuit, open circuit quickly and accurately. It also can achieve the test function of on-state resistance, insulation resistance and withstand voltage level and other additional features of the test data analysis, storage and network communication, which can be widely used in various occasions where harness are tested automatically.
The Existing Investigation and Prospect of Under-Frequency and Under-Voltage Load Shedding in Power Systems
Authors: Wang Ji Dong , Jin Di , Zhang Hui Ying , Sun Hua Dong , He Qing
Published: August 2013

Under-frequency load shedding (UFLS) and under-voltage load shedding (UVLS) as the last defense of the power system to maintain its stability are of great significance, especially for the current development of large-scale interconnected power system. At first, this paper presents the existing methods of load shedding and analyses their drawbacks. Then, a brief overview of the application of wide area measurement system (WAMS) in UFLS and UVLS is provided. Finally, a novel intelligent load shedding scheme which realizes load adjustment instead of load shedding based on the characteristics of smart grid and smart home is proposed.
Modeling and Simulation of Tri-Pole HVDC Transmission System
Authors: Lv Si Zhuo , Wen Jun , Wen Jia Liang , Yin We Yyang , Wu Jing
Published: August 2013

With the increase of the power demand and reduction of land resources, it is imperative to increase AC transmission line capacity. Tri-pole HVDC is proposed as a new technique to solve this problem. This paper presents the basic principle of tri-pole HVDC, including its schematic and current modulation strategy. Based on the platform of PSCAD/EMTDC a tri-pole simulation model is built to carry out the simulation on deblock startup and block shun down. Besides, a cooperation mode of the controller with the protection under emergency outage of single converter station or under fault occurred in DC transmission line is put forward, and simulation results show that the proposed control and protection strategies are effective.
S-Transform-Based Classification of Converter Faults in HVDC System by Support Vector Machines
Authors: Lv Si Zhuo , Wen Jun , Zhou Si Yu , Cao Wen Jia
Published: August 2013

Based on Support Vector Machines (SVM) and S-transform, a novel approach to detect and classify various types of high voltage direct current (HVDC) converter faults is presented. An electro-magnetic transient state simulation software PSCAD/EMTDC was used to set up a simulation model of HVDC system to investigate the typical converter faults. For the good time-frequency characteristic of S-transform, S-transform is applied to obtain useful features of the non-stationary fault signals. Then fault types are identified through the pattern recognition classifier based on SVM classification tree. Numerical results show that the proposed classification method is an effective technique for building up a pattern recognition system for converter fault signals.
Parameter Optimization of PI Controllers in Emergency Power Support
Authors: Yao Shu Jun , Hu Ya Nan , Han Min Xiao , Na Duo , Ma Shi Ying
Published: August 2013

This paper proposes an effective way to optimization of the PI parameters of controllers in emergency power support. Transient simulation is used to evaluate the optimization objective function, an optimization algorithm based on the Particle Swarm Optimization method is used as the engine for producing new candidate points. The ITAE index is used to evaluate the dynamic response of AC system, the objective is to minimize the weighed sum of ITAE associated with different simulation states. The usefulness of the approach is demonstrated by a simulation of multiline HVDC-AC transmission in parallel in PSCAD.
Design of Dynamic Binary Circuits Based on Floating-Gate Technology
Authors: Hu Xiao Hui , Hang Guo Qiang , Yang Yang , You Xiao Hu
Published: August 2013

The dynamic circuit technology can decrease the whole power consumption, and the Floating-gate technology can simplify the circuit structure, which will also decrease the area and power consumption of IC. Taking the advantages of both ,we propose a new dynamic binary circuit based on floating-gate technology. The HSPICE simulation results using TSMC 0.35μm double-polysilicon CMOS technology validate the correctness of the proposed approach, and the proposed circuits also have considerable simpler structures.
Signal Processing Circuit Design and Application for Infrared Optical System Based on FPGA
Authors: Cai Xiao Dong , Liu Zhi Gang
Published: August 2013

The signal processing circuit based on FPGA was proposed in the paper, carrying out the function such as programmable signal amplification, adaptive filtering and so on. Among them, the programmable amplifier module was achieved with the programmable gain amplifier in series; Adaptive filter module was implemented with the Butterworth second-order active filter, to change the cutoff frequency of the filter by changing the potentiometer resistance. Experimental results show that the signal processing circuit was applied in the infrared optical system improving the signal to noise ratio of the image effectively.
Simulation Modeling for HVDC on Improving the Stability of Weak AC System
Authors: Zhou Si Yu , Wen Jun , Cao Wen Jia , Lv Si Zhuo , Yin Wei Yang , Zhou Jing
Published: August 2013

Capacitive commutation technology is favorable in improving the stability of weak receiving end ac systems, and our Qinghai-Xizhang HVDC interconnection project is exactly belonging to this kind. In order to study the effect of capacitor commutation technology to ac and dc systems, basing on the Qinghai-Xizhang HVDC interconnection project, the paper focuses on analyzing the building of the HVDC simulation model with capacitor commuted converters (CCC-HVDC model) in PACAD/EMTDC simulation program, and then the optimization selection of commutation capacitance parameter is described. Finally, capacitor commutated converters effect in improving the stability of weak receiving end ac system is simulated and analyzed.
Steady State Power Quality Assessment Based on Principal Component Projection Method
Authors: Wang Ji Dong , Pang Xi Pin , Liu Hong
Published: August 2013

Limitations exist when individual indexes of power quality are adopted to reflect the comprehensive level of power quality in practice. In this paper, a comprehensive analysis of the individual indexes is made to get the only parameter that can show the overall specific characterization of the power quality level. The weight values of the indexes can be calculated by combining the subjective and objective weighting methods. Combined with the principal component projection method, the projection values of the border data and the data waiting for evaluating to the ideal evaluation vector can be easily obtained. Then with the projection values, it is easy to determine the grade range where the power quality data set locates. Simulation results show that this method is effective.
Low-Carbon Power Structure Planning Based on Cost-Benefits Perspective
Authors: Song Xiao Hua , Wu Ya Qin
Published: August 2013

Low-carbon economy has become a development trend in the international energy sector. Our national electric power industry as a part of the energy sector has to change the power structure in order to follow this climate. In this paper, from the perspective of cost-benefits, based on the analysis of impact of the indicators of the power structure, we establish a index system of the planning low-carbon power structure. Combined with the method of analytic hierarchy process, we re-plan the traditional power structure. Finally quantify the distribution proportion of the thermal power, hydropower, wind power, nuclear power and solar power.
Influence of Wind Power Integration on Power Grid and its Strategy
Authors: Liu Xiao Ming , Niu Xin Sheng , Jia Shan Jie , Zhang Jie
Published: August 2013

The wind power, which enjoys the most mature technology and the most common commercial application, plays an important role in optimization of power supply structure and carbon release reduction. This is to analyze the influence of wind power integration on the power grid in terms of electric power quality, capacity of short circuit, power stability, power generation planning and dispatching etc. and propose increasing the bearable capacity of wind power by power grid by means of optimizing power supply structure, constructing strong power grid, choosing reasonable types of wind driven generators and reactive compensation equipment and completing relevant laws and regulations about wind power integration to power system.
Power System Control Based on Voltage Risk
Authors: Li Ying Zhi , Liu Wen Xia
Published: August 2013

This paper focused on power system security problems and proposed risk assessment and preventive control method of electric power system based on voltage risk. The method built up a system voltage risk indicators, and have system voltage risk identified through risk assessment, on this basis, reduced the risk of the system voltage by optimizing the control variables of the system, which of course can increase system security. Finally, Refers to a 5-node tests as examples to verify availability of this method.
High-Accuracy Locomotion Control Method for Automatic Docking between Mobile Self-Reconfigurable Microrobots
Authors: Zhang Da Wei , Mao Ling , Tang Xiao Ning , Li Zhen Bo , Chen Jia Pin
Published: August 2013

A mobile self-reconfigurable microrobot actuated by MEMS-based electromagnetic micromotors is presented. Normal stepping control methods for electromagnetic micromotor are introduced. To improve the locomotion accuracy of the microrobot and the efficiency of automatic docking between them more, a Changeable Virtual Winding Method (CVWM) for high-accuracy microstepping control is developed. Experimental results demonstrate the feasibility of the concept.
Research on Impacts of FACTS on Static Voltage Stability Characteristics of AC/DC Power System
Authors: Li Fang , Chen Xing Lei
Published: August 2013

Based on the improved Continuation Power Flow algorithm, this paper investigates the impacts of FACTS on static voltage stability characteristics of AC/DC hybrid power system. This paper introduces the steady-state model of different FACTS devices, and the power flow mathematical model is established about AC/DC power system with FACTS devices. The impacts of FACTS devices with various capacities in different locations on static voltage stability are compared and analyzed. The calculation results of a four-machine two regions AC/DC power system show that FACTS are able to improve the voltage stability and the installation of SVC shunt compensation can possess a better effect to improve the system static voltage stability limit than TCSC series compensation.
The Static Voltage Stability Limit Calculation of AC/DC Hybrid Power System Based on Improved Continuation Power Flow Algorithm
Authors: Fu Hong Jun , Sun Jian Hua , Wang Jing Gang , Hu Yang Yu
Published: August 2013

With the HVDC system interconnected to power grid, the voltage stability problem of power grid has become increasingly prominent. This paper establishes the mathematical model of AC/DC hybrid power system and proposed an improved Continuation Power Flow (CPF) algorithm to calculate the static voltage stability limit of AC/DC hybrid system, the characteristics of this algorithm are as following: PQ decoupled power flow algorithm is used; Lagrange quadric interpolation is used in the process of predictor and step control; local parameter method is used in the correction. The iterations of AC/DC calculation alternate to solve power flow equations and select the step control near the critical power limit points to ensure the convergence of power flow solution. In order to verify the correctness of the proposed algorithm, this paper compares the calculation results by the improved algorithm and Matpower on the IEEE 14 bus-system. This paper calculates the static voltage stability limit of AC/DC hybrid power system under different DC control patterns of modified IEEE 14 bus-system and analyzes the impacts of different DC control pattern to the system voltage stability.
Study on Reliability Assessment of HVDC System Considering the Impact of Station Power Using System
Authors: Zhou Bao Rong , Jin Xiao Ming , Chen Jian Bin , Wang Xin Ze , Zeng Yuan
Published: August 2013

Based on the introduction of the station power using system, this paper used fault tree analysis method to model the reliability of station power using system, which had been always ignored in traditional HVDC system reliability evaluation but actually had an important impact on the result of evaluation. Whats more, it assessed the reliability of the whole HVDC system (included station power using system) by means of frequency and duration method. Finally, an example was given to prove the correctness and validity of the proposed theory.
Research of Influence of Negative Voltage at Capacitance of Pulse Transformer of Pulse Power Generator
Authors: Yin Xiao Dong , Jiang Chun Yang , Lei Min , Xia Sheng Guo , Zhou Feng
Published: August 2013

Energy storage capacitance is necessary part of pulse power generator. Generally, it is difficult to match the equivalent capacitance in high voltage side and energy storage capacitance in low voltage side of the pulse transformer. Resultantly, it requires high flow capability of switch device. In this paper, three methods are presented to solve this problem based on reasons of overcurrent. The results of simulation and experiments show that the efficiency of generator was higher with the method of thyristor and inductance in reverse parallel, and this method would be the most effective resolution.
Study of Multi-Level Inverter Staircase Modulation Technology
Authors: Ye Man Yuan , Li Song , Hu Wen Hua
Published: August 2013

With the rapid development of high-voltage large-capacity converters, multi-level inverter has been more widely used. Cascaded H-bridge multi-level inverter topology and using the trapezoidal modulation technique are described in this paper. The trapezoidal modulation of the H-bridge cascaded inverter is simulation studied with Matlab simulation software. This paper analyzes trapezoidal modulation techniques, how to establish the elimination of specific harmonics of nonlinear equations and the equations of Runge-Kutta algorithm to solve the problem, given in the different modulation to eliminate the 5th and 7th harmonic of the switching angle data. Finally, simulation results show the feasibility and correctness of the trapezoidal modulation of selective harmonic elimination technique.
The Design of Charger Based on 1T SCM
Authors: Qu An Dong , Zhang Zi Hong
Published: August 2013

For the control characteristics of lithium batteries and nickel-metal hydride batteries, to design the hardware and software components of the PWM microcontroller battery charger, 2 battery charger can access, display temperature, automatic charging, sound and light alarm function. Voltage and current parameters self-tuning method to further improve the performance of adaptive charger, it can play a good dynamic response, fast charge and slow charge, the overshoot small, and has a the dynamic tracking quality and steady-state accuracy, and mobile phone lithium battery practical application, to obtain better control effects.
The Application of Multisim in Electronic Technology Teaching
Authors: Shi Jin Yuan , Tang Yan Kun , Li Jing Quan , Fan Xiao Guang
Published: August 2013

The paper introduces the method by the way of applying Multisim in the course of the basic data electronic technique.We can find that the Multisim has a good perspective. Its ability of changing the circuit and component parameter can help us to know about its different characteristics of electronic circuit. It also will become a tool to train the students actual ability. To use the computers to design EDA will be a good direction in the course of electronic teaching.
Study on the Characteristics of a New Type Pneumatic Pressure Regulator
Authors: Ma Jun Gong , Chen Xin Hua
Published: August 2013

ressure regulators are very important elements in pneumatic systems. Purely mechanical pressure regulators are commonly used to control the supply pressure to the desired value. The intelligent pneumatic pressure regulator (IPPR) is designed as the demands of pressure control precision increase. Its prominent advantage is the ability to achieve accurate output pressure, remote control and centralized management. In this paper, the IPPR consists of a mechanical valve body, a stepping motor, a microcontroller, a pressure sensor. Herein, its pneumatic characteristics were analyzed, and the pressure control algorithm was presented. The superior performance of IPPR was shown in AMEsim simulation, especially in terms of avoiding affects from upstream pressure and downstream flow disturbances.
Design of Image Acquisition and Storage System Based on SOPC
Authors: Li Jin Lun , Cui Shao Hui , Chang Liang Liang , Wang Guang Long
Published: August 2013

Image acquisition and storage are the premise of image processing and analyzing. An embedded image storage system on SOPC technology is researched by introducing acquisition module and initialization in detail. By configuring NIOSIICPU and some corresponding interface modules on FPGA and software design, image data can be stored in SD card. Experiment results indicate that the system works properly and has good application prospects.
A Novel Fault Orientation Technique of FPGA Configurable Logic Blocks Based on Improved Shift Register
Authors: Zhang Jun Bin , Cai Jin Yan , Li Dan Yang
Published: August 2013

With the development of digital integrate circuit system which is based on Field Programmable Gate Arrays (FPGA), the request on FPGA test technique is becoming higher and higher. The Boundary Scan Technique and Built-In Self-Test (BIST) technique appear in succession, however, these techniques dont implement Configurable Logic Block (CLB) fault diagnose and fault orientation. Arrays-based technique was advanced, which also have some problems about masking of faults and too many reconfiguration times. According to these problems, A Novel Shift Register-based technique for Fault Orientation of FPGA Configurable Logic Blocks was advanced. The paper analyses the design theory about core circuit configure, and has important significance impact on Fault Orientation of FPGA Configurable Logic Blocks.
A Design of Graph Generator of Laser Shake Mirror Based on C8051F020 Microprocessor
Authors: Tang Yan Kun , Shi Jing Yuan , Song Nuan , Yang Kun
Published: August 2013

A design method of graph generator of laser shake mirror based on C8051F020 microprocessor is put forward and introduces hardware structure and circuit scheme. Through the modularized design method of software, kinds of graph can be outputed. Through test, this system can achieve its functions.
Direct Extraction Method of InP HBT Small-Signal Model
Authors: Lu Hai Yan , Cheng Wei , Chen Gang , Chen Tang Sheng , Chen Chen
Published: August 2013

An accurate method for extracting the elements of InP HBT small-signal model parameters is proposed in this paper. The method can accurately resolve the most important internal parameters from the measured S-parameters, and is not sensitive to the values of parasitic parameters. The initial values of the parasitic are extracted by using a set of test structure, and the intrinsic elements determined by using the analytical method are described as functions of the parasitic elements. The extraction procedure uses a set of closed-form expressions derived without any approximation. An experimental validation is carried out on three HBT devices and satisfactory results are obtained up to 20 GHz.
Realization of CAN Based on Automotive Open System Architecture
Authors: Wu Xue Qin , Li Lu Lu , Chen Hong Jun
Published: August 2013

AUTOSAR will make the software better portable and expansible, will shorten the development cycle and reduce the cost of development. Because of AUTOSARs module idea, this paper designs the communication stack basing on Controller Area Network (CAN), and describes the critical realization of CAN driver, CAN interface, CAN transport layer, communication and diagnostic management. So it can meet the requirement of automotives control network.
Research on Real-Time Moving Method of Electronic Equipment Virtual Maintenance Prototyping Model
Authors: Zhu Dong Fang , Su Qun Xing , Liu Peng Yuan
Published: August 2013

For the purpose of convenient control in the process of realising Vitual Maintenance System based on EEVMP(Electronic Equipment Virtual Maintenance Prototyping), make an research on real-time moving method of mouse controling three-dimensional model. It analyzedes the process of coordinate transform.And then,explains the figure course of real-time model move. It realises the real-time model moving in a electronic equipment virtual maintence system in the end.
Experimental Study of Capacitance Sensors to Test Seed-Flow
Authors: Sun Yu Jing , Jia Hong Lei , Ren De Liang , Yan Jing Jing , Liu Yang
Published: August 2013

The real-time seed-metering device performance detection is one of key techniques to ensure operation quality of a planter. A crossed E-shape plate capacitance sensor, a parallel-plate capacitance sensor and a differential tri-plate capacitance sensor, are proposed to test corn-seed flow. The detection concept and sensor structure parameters are presented. An adjustable stand is designed to investigate the impact of sensor structure and seed velocity on the outputs of capacitance sensors. The sensitivity and the feasibility of 3 sensors are studied by detecting capacitance variations at different corn-seed speeds. Experimental results show that, with average capacitance variation 0.1245pF and 0.1115 pF, respectively, the crossed E-shape plate sensor and the differential tri-plate sensor are suitable to measure corn-seed metering device performance.
OFDM Parameter Design of a Digital Broadcasting System in FM Band
Authors: Li Ji Long , Yin Yan Bin
Published: August 2013

A thorough OFDM parameter design method of a digital broadcasting system in FM band is presented in this paper. Key OFDM parameters are analyzed from their constraints. Cyclic prefix should satisfy the requirement of channel delay and formation of SFN. Design of system bandwidth should consider coherent bandwidth and existing frequency planning. Symbol duration is restricted by time selectivity and frequency selectivity of the channel, and also efficient SINR should be maximized. System simulation is performed to test and verify the parameters under typical FM band channels. A set of OFDM parameter is provided for future design.
Western Countries Car Low Sulphur Fuel Standard Implementation and Supervision
Authors: Yao Yong , Di Min Yan , Di Dan , Li Pei Jie
Published: August 2013

In recent years, the western countries for the implementation of emission reduction goals, all carried out low sulphur or zero sulfur fuel. For the implementation of low sulphur fuel standard implement, government agencies designated third party supervise, monitor, and submit the test report system, for sales unqualified fuel enterprise impose high fines or imprisonment. To ensure the market sales of more than 95% fuel to low sulphur standard. These management measures on our car fuel market standards and management of great significance.
Cognitive Radio as Enabling Technology for Dynamic Spectrum Access
Authors: Wei Nai Qi , Chen Zi Li
Published: August 2013

Frequency spectrum scarcity is currently one of the mostly discussed topics in wireless communications. When there is no free spectrum available, no new broadband communication techniques can be put into operation. The double use of already assigned frequencies leads to interferences. A possible solution to the problem is Dynamic Spectrum Access (DSA), realized through Cognitive Radio (CR) technology. Cognitive Radios have the ability to detect unused spectrum segments and to adapt to it dynamically. This adaptation does not only concern a change of frequency, but may also include changes in waveform, bandwidth, or whatever leads to an optimal communication link. This paper gives an overview of the state-of-the-art Cognitive Radio approaches and points out opportunities offered by this technology to overcome the threat of spectrum scarcity.
A Study on Turbo Code Performance Based on AWGN Channel
Authors: Zhu Peng , Zhu Jun , Liu Xiang
Published: August 2013

Turbo codes have a wide range of applications in 3G mobile communications, deep-sea communications, satellite communications and other power constrained fields. In the paper, the Turbo Code Decoding Principle and several major decoding methods are introduced. Simulations of Turbo code performance under different parameters of AWGN channel are made and the effects of the different interleaving length, the number of iterations, and the decoding algorithm to Turbo code performance are also discussed in AWGN channel. Simulation results show that under the same signal-to-noise ratio, the more the number of iterations is, the longer the sequence of information is, and the more excellent decoding algorithm is, the better the performance of Turbo codes is.
Analysis of Mobile Phone Camera Performance Estimation Method
Authors: Chen Qian , Yan Bin Feng , Liao Jun , An Gang
Published: August 2013

As the forefront of mobile communications, mobile phone industry broad market prospect attracts more and more enterprises to enter this field. With the rapid improvement of the industry, mobiles develop from original feature phone to smart phones, which can take pictures, catch video, access Internet and so on. Meanwhile, performance of camera also becomes the focus of peoples attention.
This paper analyzes the performance of the camera objective and subjective evaluation methods, and raises the appropriate test standards. Finally, it suggests a comprehensive evaluation of subjective and objective scoring method, hope can be promoted.
Fault Analysis of AC Uninterruptible Power Supply System in Gas Pipeline Compressor Station
Authors: Chen Han Lin
Published: August 2013

Regarding the AC UPS fault accident happened in one compressor station which caused severe consequence with gas transmission pipeline, this paper lists the possible reasons based on the recorded fault code and equipment configuration, and solutions are proposed for modification. In the end, recommendations are given for the future project design of AC UPS.
The Temperature Measurement for the 10 kA HTS Cable
Authors: Zhu Zhi Qin , Dai Shao Tao , Teng Yu Ping , Xiao Li Ye , Liang Xue Min , Cao Zhi Cheng , Zhang Dong , Ma Tao
Published: August 2013

A 10 kA HTS cable for the most transmission current in the world has been successfully demonstration developed on Sep. 26, 2012 in Gongyi, Henan Province of China. The 10 kV HTS cable is 360 meters long. This paper described the temperature measuring for the 10 kA HTS cable and the calibrated error is 0.1 K. The temperature signals of the 10 kA HTS cable conclude the high-voltage temperature signals and the low-voltage temperature signals which use the different high-precision digital voltmeters to test. Software is developed by using GENESIS 64 program.
Fuzzy Knowledge Representation and Reasoning of the Smart Grid Based on Medium Logic and its Application
Authors: Wang Jian , Wang Qiang , Ma Wei Qing , Yao Da Hai
Published: August 2013

Medium logic completely reflects both the contrary relation and the contradictory relation. This paper introduces fuzzy privative and opposition privative in traditional knowledge representation. It takes a power transmission and distribution program for example, adopts a ratio function of distance to define the fuzzy set's member functions. Moreover, one confirmed method is presented to define the value as well as the threshold value in fuzzy production rules.Finally it discusses fuzzy knowledge reasoning by a specific example.