bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of Transport Beams Arrangement in Target Area of SG-III Facility
Authors: Wang Mei Cong , Zhu Ming Zhi , Chen Gang , Wu Wen Kai , Que Xing Hua
Published: September 2013

In target area of Inertial Confinement Fusion (ICF) facility, the rectangular beams arrangement at the main amplifier (MA) output is mapped to the spherical-geometry beams configuration near the target chamber. The beams are imported into the final optical assemblies with special angles. In this paper, the transport beams arrangement design of SG-III facility is described. Firstly, the primary requirements of the transport beams arrangement in ICF target area system are given. Then the typical transport beam pathway from the MA output to the target chamber center is analyzed. The general layout, beams path length, and the parameters of transport mirrors are discussed for the transport beam arrangement.
The Application of EEMD to Fault Diagnosis of Rolling Bearing
Authors: Lv Zhong Liang , An Pei Wen , Tang Bao Ping , Zhang Li Hui
Published: September 2013

The EEDM(Ensemle Empirical Mode Decomposition) combined with correlation coefficient was proposed for identify the fault of rolling bearing. First, the fault of rolling bearing vibration signal will be decomposed into several IMF components, in view of the illusive component may appear in EEDM components, respectively calculate each IMF components and the correlation between the original signal, then carry out spectrum analysis to each IMF components and pick up fault feature. Through the experimental failure data analysis of rolling bearing inner ring, the EEMD method is good for fault identification of rolling bearing.
Driver Temperature Automatic Detection Device Based on FLIR and Face Recognition
Authors: Zhang Bing , Qiu Yu Ping , Yan Wei
Published: September 2013

For the purpose of screening drivers with higher than normal temperature, we developed a device based on Forward-looking Infrared Imagery (FLIR). Infrared curtain is used to detect the height of vehicle for the automatic positioning mechanism, face recognition technology is used to overcome sources of interferences, a dynamic equivalent temperature screening method is developed to distinguish the drivers with higher than normal temperature. This device was tested in Huang gang Port and had a good result, now it has become a standard facility in port of entry.
Research on Online Fault Diagnosis Model Based on IoT in Process Industry
Authors: Deng Ju Li , Chen Guo Rong
Published: September 2013

Obtaining the fault information online may eliminate many potential fatal accidents, in order to inspect and resolve the online fault diagnosis problem in process industry, an online fault diagnosis model based on IoT(Internet of Things) is proposed in the paper. the model is composed as four layer of user layer, application layer, basic technology layer and resources layer, and it can use the resources effectively such as virtual organizations, entity organization, equipment, network resources and so on, the basic technologies such as Internet of things, multiple information collection, knowledge engineering and application technologies were analyzed in the paper too. Finally, an application system is developed, and it proved the model is validity and correctness.
Three-Phase Magnitude Detection Based on Decoupling Positive and Negative Sequences of Double D-Q Transformation
Authors: Zhang Xiao Ying , Jiang Zheng , Zhou Zhong Jian
Published: September 2013

This paper introduces T/4 time-lapse elimination detection, a novel method of detecting three-phase magnitude based on double d-q synchronous reference frame, functioning in decoupling positive and negative sequences of fundamental wave. When the voltage (or current) fundamental positive and negative sequence components are separated, their magnitudes can be detected respectively, so it is effective to restrain the impact on detection precision from negative sequence component. To verify the performance of this novel method, simulation experiments like transient response under normal grid condition and dynamic response under three-phase unbalance with harmonic pollution condition is finished. The results indicate that the novel method obtains a high precision of measure and a better dynamic property and has advantages on preventing harmonic propagation compared with T/16 time-lapse elimination detection method. Thus it can be wildly applied in three-phase power electronic devices.
Study for Detection Algorithm of QRS Complex in ECG Signal
Authors: Li Xu Wen , Zhang Bi Wei , Wu Qiang
Published: September 2013

In ECG signals accurate detection to the position of QRS complex is a key to automatic analysis and diagnosis system. And its premise is that effectively remove all kinds of noise interference in ECG signal. Here, a method of detecting QRS based on EMD and wavelet transform was presented which is aim to improve the anti-noise performance of the detection algorithm. It is combined EMD with the theory of singularity detecting based on wavelet transform modulus maxima method. It has the high detection accuracy and good precision that can give an effective way to the automatic analysis for ECG signal.
Design and Implementation of Yarn Tension Measurement System during Weft Insertion on Air-Jet Loom
Authors: Wu Zhen Yu , Hu Ke Qiao , Pan Zhen , Hu Xu Dong
Published: September 2013

Yarn tension during weft insertion is one of important factors which affect fabric properties. In air jet loom, many components have an influence on yarn tension, such as clamp, main nozzle, sub nozzle, brake, and the drum. In this paper, a measurement system for yarn tension experiment which based on a 32-bit Cortex-M3 embedded processor was designed and implemented. The system can control components at fixed time interval which is set by a supervisory computer, acquire yarn tension converted by a contacted electromagnetic induction tension sensor, and then transmit tension data to software system by Ethernet module. An experiment is conducted for research character of yarn tension driven by air flow. The experiment results indicate that the nozzle pressure and yarn diameter play an important role in yarn tension during weft insertion on air-jet loom. Besides, the delay of magnetic value is also considered under different nozzle pressure.
Pulsed I-V Auto-Measurement of High Power MOSFETs without Self-Heating
Authors: Sun Wei
Published: September 2013

A novel Sagittarius automatic Pulsed I-V measurement system was developed. This new system eliminated the self-heating effect which affected static measurements of High Power MOSFETs using conventional methods. It provided the true output conductance and trans-conductance, solved the device modeling problems caused by negative output conductance of high power devices. The automation measurement function can fulfill the mass measurement requirements of semiconductor industry with high efficiency and accuracy.
Equal Precision Rotation Speed Measurement System of Vichicle Transmission
Authors: Li Hong Tao
Published: September 2013

The rev of vehicle transmission is an important parameter to reflect the performance of the power train, and the measurement accuracy will have an influence on the implement of electronic control technology in transmission system. Based on the analysis of common rev measurement methods, aiming at the feature of wide range of rev during HMCVT test, a method of rev equal precision measurement is been put forward.
The Review on Fault Diagnosis Methods for Power Batteries in Electric Vehicles
Authors: Wang Zhen Po , Zhou Yang
Published: September 2013

As the only power source of electric vehicles (EVs), power battery pack is also the main fault source in EVs. The faults of power battery affect its performence and life, and even endanger vehicle security in extremly situation. Early fault diagnosis of power batteries can reduce losses, minimize maintenance, guarantee vehicle performence, security and realibility. In this study, the faults of power batteries are summarized, four fault diagnosis methods are concluded and analyzed, and the applicability of each method is compared and discussed. The principle of choosing the diagnosis method is that choosing according to the diagnostic condition.
Technical and Economic Analysis on Renewal of Shipborne Measurement and Communication Equipments
Authors: Zhang Yong Liang , Zhou Jiang , Liu Xiao Chun , Xue Jun
Published: September 2013

Shipborne measurement and communication equipments are central parts of space measurement ship. Renewal of the equipments is very important for space measurement tasks. Also it is important to save cost for continual development. The paper proposes the problem of technical and economic analysis of the renewals. The maintenance and update with their analysis are introduced too. Finally schemes of the renewal and its decision-making method are presented. The renewals are motivated mostly by requirement of space missions at present. But for continual development the ratio of efficient and cost is important. The decision-maker may refer the paper and select scientific renewal scheme.
A New Fault Diagnosis Method of Hydraulic Pressure System Based on Fuzzy Theory
Authors: Hong Chai Chun , Cai Wei
Published: September 2013

in the thesis we introduce fuzzy mathematic method into fault diagnosis of hydraulic pressure system, bring forward the fuzzy membership grade method which is based on the history data and expert preferential ordinal number, set up a mathematical model of fault diagnosis, and carry out the fuzzy diagnosis on hydraulic pressure system fault in computer. The example shows that this method is advantageous to accuracy and credibility of decision and is valid and viable in the application.
Study on Lane Detection Based on Computer Vision
Authors: He Peng , Gao Feng
Published: September 2013

Lane detection is a crucial component of automotive driver assistance system aiming to increase safety, convenience and efficiency of driving. This paper developed a vision based algorithm of detecting road lanes which is performed by extracting edges and finding straight lines using improved Hough transform. The experimental results indicate that this algorithm is effective and precise. Furthermore, this algorithm paves the way for the implementation of automotive driver assistance system.
Research on Transformer Monitoring System Based on Vibrational Spectroscopy
Authors: Zhang Wei Cong , Dai Zheng Wu , Zhang Wen Xiang , Zhang Ji
Published: September 2013

Power transformers vibration principle was analyzed, using vibration spectroscopy, design and development of a power transformer online monitoring system, through the transformer vibration monitoring, to indirectly infer the DC magnetic bias circumstances, Realized condition monitoring of Substation. This paper describes the system works, the constituent modules and the corresponding indicator characteristics, proposed monitoring algorithm optimization, Given the interface of real-time monitoring data, historical data, system was running good, stable and reliable.
Research on Cloud Platform for Wind Turbine Fault Diagnosis
Authors: Zhen Cheng Gang , Yue Li Ming , Wu Ying Jie
Published: September 2013

The computational and storage resources of Wind Plant couldnt be fully utilized is a problem worth paying attention.The remote falut diagnosis center of wind turbine can integrate the data of each Wind Plant together, but the large amounts of data generated by the Wind Plant increase the cost of the enterprise. The Cloud Computing Platform which was built on the computing clusters with commodity machines can fulfill the demand of the mass storge and large-scale computing, and improve the real-time fault diagnosis evidently. With the web interface of the Cloud platform application, the accending personnel can look over the failure analysis results, inspection reports, and failure prediction system at the first time to prevent accidents and minimize the damage of the Wind Turbines.
Abnormal Behavior Detection Based on Global Motion Orientation
Authors: Ma Xu Yan , Liang Guo Mao , Yu Wei , Qu Zhi Yi
Published: September 2013

A novel approach is introduced in this paper to detect abnormal behavior based on global motion orientation. Compare to the normal behavior (walking, shaking hands etc.), abnormal behavior has different orientation. The method we introduced divides each frame into blocks, makes statistical analysis of the global motion direction histogram of all frame blocks and extracts characteristics. At last, behavior is detected with support vector machine (SVM). Experiment shows that the method proposed in the paper has certain robustness and can achieve real-time monitoring.
Influence of DC Bias and Remnant Flux on Measuring Current Transformers
Authors: Shen Lu , Zhao Shu Tao , Zhang Pei , Hu Bin , Tian Xiao Qian
Published: September 2013

Current transformer (CT) is an important transmission equipment in power systems. DC bias and remnant flux can change the working point of CT in the core magnetization curve and has a direct impact on the accuracy of electric energy metering and measurement. The simulation circuit model is built by using the simulation software PSCAD and the change of ratio error, phase displacement and exciting current with DC bias and remnant flux are analyzed. The results show that DC bias and remnant flux will both increase the ratio error and phase displacement in opposite directions and the error size will be far more than the limit value when DC bias and remnant flux exist in same direction at the same time. Furthermore, the existence of DC bias and remnant flux will also cause the raise of exciting current size, asymmetry of exciting current waveform and appearance of even harmonics. This will seriously affect the transmission accuracy of measuring CT.
Optical Surface Cleanliness Inspection, Degradation and Maintaining in High Power Laser System
Authors: Wang Bao Xu , Wang Mei Cong , Zhu Ming Zhi , Chen Xiao Juan , Wu Wen Kai
Published: September 2013

High Power Laser System (HPLS) is a large optical instrument, provides extremely high temperature and pressure conditions for inertial confinement fusion (ICF) and high-energy-physics research. It contains large number of optics and which would be easily damaged due to high fluence of laser power. The contamination control of optical surfaces has a great significance to ensure the performance of the system and decrease costs. This paper discussed the background and development of cleanliness control techniques in high power laser systems, including contamination induced laser damage (CILD), contamination inspection, optical surface cleanliness degradation and maintaining.
A Study on Space Debris Observation System Using Radio Telescope
Authors: Zhao Zhe , Zhao You , Gao Peng Qi
Published: September 2013

The capability of space debris observation system using radio telescope was analysed in the present paper. The special bi-static observation system includes radar and large radio telescope. Detectable range of fixed RCS targets and detection ability of small space debris at fixed range were discussed respectively. The simulations of this particular observation system were implemented. The simulating results were approximately correct comparing with the actual Effelsberg experiments. The analysis of this paper gives a theoretical basis of space debris observation by domestic large radio telescope.
Design of Linear Damper in Calibration Device for Dynamic Force
Authors: Xie Wei Dong , Lv Hao Liang , Shen Ji Sheng
Published: September 2013

The force transducer for dynamic calibration in absorber dynamometer is usually statically calibrated. To solve the problem, a new kind of dynamic calibration device and its working principle is discussed. Furthermore , the principle of its core member, linear damper, is particularly analyzed. Moreover dampers in different structures are discussed in depth and the production of its damping force is deduced. Thus, the theoretical premise of dynamic calibration device and linear damper is provided in this essay.
Simulation and Design of Wireless Energy Transmission for Implantable Micro-Electromechanical Devices
Authors: Chen Jian , Ma Lei , Zhang Wei , Li Yao
Published: September 2013

The purpose of this study is to describe a novel topologic technology for wireless power transmitting through external coils to multiple implantable micro-electromechanical devices inside the patient body, which is able to solve the dilemma of recharging. Wireless power transmitters are designed based on class π-type topologic structure, which improves existing Class-E power amplifier structure and impedance matching technology. Mathematical Models based on resonating chopper MOSFET and class π-type impedance matching network are introduced to optimize the design parameters. Together with proper capacitors and high-flux, low-loss inductors, an optimal wireless power transmitter with significant characteristics of high efficiency and low loss takes advantage of this brand new type of topologic structure. The author designed and developed the RF oscillator and the actual class E power resonant amplifier. During studies, with the 12V power supply, the voltage of 96.8V is generated on the 50ohm high-power RF load side, along with source current of 2.183A. The efficiency of the system reaches 89.4%, which satisfied the need for implantable micro-electromechanical device.
Technology Research on Intelligent Infrared Gas Analyzer
Authors: Xu Di Jian , Zhang Mao Cheng , Wang Sen , Yang Jun Ling
Published: September 2013

The theoretical basis of the Infrared analyzer is expounded in this paper. To Lambert-Beer absorption law, the paper has made math derivation and gives introduction about Infrared absorption spectra of some common gas. The focus is on spectroscopic techniques involved in Infrared gas analyzer, optical path design of optical system and monitoring technology.
The Research of Blood Glucose Monitoring System Based on Biosensor
Authors: Feng Jing Xian , Wang Ming Quan , Zhang Shi
Published: September 2013

The detection of blood glucose concentration plays an important role in diabetes treatment. This paper proposes a design which is compatible with finger blood signal acquisition and dynamic blood sugar monitoring in real time. It mainly studies different biosensors which are used to do the glucose signal acquisition. Then we discuss the processing methods of human blood glucose signal using the sensors we studied. This paper outlines the hardware implementation and software management. Based on the core of STM32 embedded microprocessor, the system can achieve glucose signal acquisition, LCD display, historical records restore, data transmission by USB and wireless transmission through Bluetooth. At last, system functions are tested. It is proved that the system is reliable and performs well.
Application Research of Remote Sensing in the Field of Land Use and Land Cover
Authors: Dong Shi Wei , Li Hong , Sun Dan Feng , Zhang Wei Wei , Zhou Lian Di
Published: September 2013

As a new high-technology with large amount of information, strong temporal resolution, high efficiency and low cost, remote sensing provided a useful tool for related researches of land use and land cover in different spatial and temporal scales. Firstly, concepts and characteristics of the remote sensing technology were introduced. Secondly, its applications were elaborated in land use and land cover such as land resources survey, land resources change monitoring, land use evaluation, overall planning of land use and land consolidation aspects. At last, future application trends and several aspects noticed were pointed out.
Spatial Pattern Analysis of Land Use and Land Cover Change Based on MODIS
Authors: Dong Shi Wei , Li Hong , Sun Dan Feng , Zhang Wei Wei , Zhou Lian Di
Published: September 2013

Understanding the process and pattern of regional land use and land cover change was essential for intensive and highly efficient, scientific and rational utilization of land resources. Technologies of remote sensing (RS) and geographical information system (GIS) were applied to simulate and analyze the land use changes from 2000 to 2007 in Pinggu district in Beijing, China. The area of cropland decreased by 62.42 km2, while the area of construction land, orchards and forests increased 17.65 km2, 25.88 km2 and 17.86 km2, respectively. We should develop appropriate policies and measures to increase the area of cultivated land in the future. The research results provided the necessary reference for the related researches of land use and land cover change.
Lane Detection Based on Improved Canny Detector and Least Square Fitting
Authors: Chen Guang Hua , Zhou Wen , Wang Feng Jiao , Xiao Bin Jie , Dai Sun Fang
Published: September 2013

The video images of road monitoring system contain noise, which blurs the difference between the lane and the background. The lane detection algorithm based on traditional Canny edge detector hardly detects the single-pixel lane accurately and it produces pseudo lane. The paper proposes an effective lane detection method based on improved Canny edge detector and least square fitting. The proposed method improves the dual-threshold selection of traditional Canny detector by using the histogram concavity analysis, which sets the optimal threshold automatically. The least square method is used to fit the feature points of detected edges to accurate and single-pixel wide lane. Experimental results show that the proposed method detects the lane of video images accurately in the noise environment.
Research on Algorithm of Phase Difference Analysis Based on an Improved Windowed FFT
Authors: You Bu Xin , Liu He Zhi , Tian Peng , Xu Jia , Bu Jing
Published: September 2013

Based on the small scale power system frequency fluctuation frequency leakage problems due to the FFT phase measurement error problem, this paper presents a high accuracy algorithm for phase difference measurement based on windowed discrete Fourier transform, the signal truncated using 4 order Blackman-Harris window, and corrects the phase correction method for discrete spectrum thus to calculate the phase difference. The algorithm for phase difference measurement theory and signal frequency independent, so there is no need to sample the signals of the whole cycle. A simple algorithm, less calculation, high precision, has strong inhibition on the harmonic and noise, simulation results verify the feasibility and effectiveness of the algorithm.
A Study of High-Precision Internal Clock Maintenance Method
Authors: You Bu Xin , Liu He Zhi , Tian Peng , Xu Jia , Bu Jing
Published: September 2013

In the engineering application, we put forward higher request to the device in the clock accuracy and stability. In this paper, we can modify GPS second pulse online which based on the GPS timing and combine high precision crystal in order to reduce its random error. And on this basis, we put forward a method of dynamic compensation to do the real-time numerical compensation in the apparatus. It can be used as accurate information for the device using nanosecond, not only has high precision, but also simple to implement, and has higher application value in engineering.
A Highly-Selective Filter Based on Negative-Refractive-Index Transmission-Lines
Authors: Tang Xin Kun , Guan Ya Lin , Zhou Shi Lei
Published: September 2013

In this paper, a highly-selective filter based on the composite right/left-handed transmission line (CRLH-TL) theory is presented .It is realized by replacing the traditional shunt inductive loading with a series LC resonator to ground. An attenuation-pole can be introduced by replacing the shorted-stub with a open stub.Simulation using ADS and HFSS of a compact highly-selective filter demonstrated the viability of the approach.
Simulation and Analysis for Current Transformers with DC Bias and Remnant Flux
Authors: Tian Xiao Qian , Li Bao Shu , Shen Lu
Published: September 2013

The transfer characteristics of current transformers (CT) change due to DC bias, which directly impacts the accuracy of measurement and power metering. Based on equivalent circuit models and core magnetizing characteristic, qualitatively analysis current transformer saturation increase errors of CT. Transfer errors under DC bias and remnant flux are also obtained based on J-A model of CT in PSCAD/EMTDC and full-wave Fourier algorithm to show that the ratio error and phase displacement increase with the DC bias. Based on FFT spectrum analysis to identify remnant flux and DC bias provides scientific basis for error compensation of CT.
Study on Hybrid Energy Storage System of Super-Capacitors and Batteries
Authors: Liu Jian Ye , Jiang Shan Shan , Tian Chang Ge , Zhang Meng
Published: September 2013

Designed based on bi-directional DC / DC converter of the super-capacitor and battery hybrid energy storage system, using both on the technical performance have strong complementary features that can improve the battery charge and discharge process, so that the battery charge and discharge cycles decrease, prolong the service life of battery. In matlab/simulink environment, established a system simulation model, the result showed that the hybrid energy storage system can effectively restrain the DC bus voltage fluctuations, make the output voltage relatively stable.
A 10bit 1MHZ SAR ADC for Automobile Electronics MCU with Rail-to-Rail Input Swing
Authors: Chen Cheng Ying , Dai Lan , Hu Xiao Yu , Hei Yong
Published: September 2013

Based on the DAC structure of single sampling capacitor that insures the rail-to-rail input swing a 10bit 1MHZ SAR ADC is implemented in GSMC 0.18μm 1P6M CMOS Mixed-Signal process for automobile electronics MCU. The measurement results show that in 1.8V power supply, 51KHZ input frequency and 1MHZ clock frequency, the SFDR is 71.364 dB, ENOB is 9.49 bit, total power is 2.24mW, which meet the application requirements of automobile electronics MCU.
A Multiple Fiber Grating Sensor System Using Code Division Multiple Access
Authors: Li Wei , Zhang Yong Jia , Wen Hong Qiao
Published: September 2013

In order to increase the multiplying density of Fiber Bragg Grating (FBG) sensors, a novel FBG Sensing System based on CDMA technology has been developed. Simulation experiment indicates the CDMA technology combine with optical fiber grating sensing system together successfully. Furthermore, the system can distinguishes the FBG and enhance the FBG network band utilization.
A Design of Electronic Laser Harp Based on SCM
Authors: Long Ling , Lu Zhao Ren
Published: September 2013

A design of electronic laser harp based on SCM (the abbreviation for single chip microcomputer) is proposed. It adopts the semiconductor laser transmitter and the receiving tube as a sensor, and uses the laser transmitter emits beams to imitate the 8 strings of harp. The main control chip STC89C52RC collects and processes the signal from receiving tube circuit, then STC89C52RC outputs special signal to produce sound of harp by audio. Compared with the traditional method, this design greatly enhances the anti-interference ability of the system, and it owns a certain degree of innovation and creation in not only the form of performance but also design proposal of system.
Grey Comprehensive Relational Analysis of Influencing Factors of Communication Equipment Fighting Efficiency
Authors: Yu Hai Xia , Liang Guang Dong , Gao Xian Jun , Zhang Hong Chun
Published: September 2013

The paper introduced grey comprehensive relational grade into transverse analysis and compare for several similar communication equipments. By analyze the grey relational principle, the relational coefficient, the selection of the distinguishing coefficient and studying several relational grades, the grey comprehensive relational grade is successfully applied to analysis of communication equipment fighting efficiency .Results of the practical application show that the method based on the comprehensive grey relational grade analysis has the advantages of simplified computation and feasible, consistency to the qualitative analysis result ,It can provides theoretical guidance for targeted maintenance of the equipment and improve and increase rapidly fighting efficiency of airborne early communication system in war.
Power System Simulation Data Description and Conversion
Authors: Tang Wen Xiu , Zheng Wei Yu
Published: September 2013

The commercial power system simulation software data formats are different.The type of data format conversion is a widespread yet to be solved problem.It is likely to achieve the PSD BPA interface transient model description and develop PSD BPA interface/ODM adapter program due to the improvement and expansion of open data model (ODM),using the adapter to achieve BPA Interface ODM/Inter PSS data conversion,finally verify the development of adapter is correct through IEEE9 node and a practical system conversion thus illustrating the feasibility and convenience of data conversion based on ODM..The development of procedures is open in ODM item and is meaningful to the development of other data formats.
Review of Mechanical Structure of Force Actuator for Optical Astronomical Telescope
Authors: Zhang Yu Fang
Published: September 2013

Reviewed the application of force actuators in the optical astronomical telescopes, and introduced the working principle, mechanical structure, performance requirements and basic components of the force actuators; then compared the advantages and disadvantages of force actuator types which commonly used in astronomical telescopes, finally, propose a outlook of the development trend of the actuator on the great telescope application requirements.
Response Status Evaluation of Sensitive Equipment to Voltage Sag
Authors: Liu Yuan Fan
Published: September 2013

Considering the multi-value mapping resulting status of equipment response event to voltage sag, a lattice ordered evaluation method is proposed. In this method, interval number between the upper and lower possibility of equipment status is used to present its lattice ordered characteristics. Possibility degree matrix is used to compare resulting statuses. Simulation results have shown that this method is accurate, less-sample-dependent and applicative.
Application of Operations Research for Production Scheduling
Authors: Li Ping
Published: September 2013

To properly respond the market trends, the manufactory needs efficient production management. Maintenance scheduling is one of the critical factors to maximize the available machine time in the manufacturing process. Besides, other restrictions should be taken under the consideration, which include: sales forecasting, consideration of inventory level and storage capability for product storage. This paper focuses on using the method of operations research to replace the manual process of production scheduling.
Modeling and Analysis of Voltage Sag Sources in Distribution Network
Authors: Zhang Lei , Liu Jun , Li Yan Song , Wang Zhan Sheng , Li Chun Xiao
Published: September 2013

The mechanism of voltage sags due to three main voltage sag sources, such as line faults, startup of large induction motor and transformer energization, was analyzed theoretically. Based on the typical structure of the distribution network of a large industrial enterprise, the paper presented a simplified analytical model for voltage sag sources and conducts a test with the above three kinds of voltage sag sources in Matlab/Simulink. The results show the proposed model is correct and suitable for the analysis of distribution network.
Self-Protection Mechanism for Distribution Fiber in TWDM+OFDM PON
Authors: Jia Wu , Zhang Pei , Wang Jian Quan , Zhong Xiu Fang , Kang Jian , Shao Yan , Guo Lin
Published: September 2013

Two main types of TWDM PON are distinguished by the locations of AWG and splitter. Three self-protection mechanisms i.e., dual fiber bridging pair (DFBP), single fiber bridging pair (SFBP), and single fiber bridging ring (SFBR) are designed based on bridging fiber and can be directly used on TDM part of optical distribution networks (ODN). After combined with the spectral periodicity property of AWG, the three schemes can be used in WDM part too. Each ONU can use monitoring and reporting mechanisms on optical signal to detect the fiber failure. DF then can get self-protection without any service interrupt and loss. The calculation results show the proposed schemes can keep high survivability and connection availability, while the cost, recovery time and power budget are acceptable.
A Study on Small Signal Stability of the Large-Scale Wind Farm with DFIGs
Authors: Yang Min Jing , Li Yan , Wen Jin Yu , Liu Chun Fang , Zhu Min Jie , Liang Tang Jie
Published: September 2013

The high penetration of doubly-fed induction generators (DFIGs) entails a change in dynamics and operational characteristics of the power system, thus this paper investigates the small signal stability of the large-scale wind farm with DFIGs. The GE 1.5MW DFIG is modeled in power system analysis software package (PSASP), and a large-scale wind farm with DFIGs is established. Then, the two-area test system with four generators is applied to assess the effect of the large wind farm on power system inter-area oscillatory mode in which the penetration and the installation site of the wind farm are considered. Finally, the simulation results indicate that abundant penetration of DFIG-based wind power will improve the inter-area oscillatory, and the integration of wind farms with DFIGs in the receiving area makes the inter-area mode highly damped.
Performance Analysis of a Multi-Channel MAC with Dynamic CCH Interval in WAVE System
Authors: Zhu Dong Bi , Zhu Dan Dan
Published: September 2013

To improve the throughput performance of the Wireless Access in Vehicular Environment (WAVE) system, we propose a multi-channel MAC protocol that is able to adaptively adjust the intervals of Control Channel (CCH) and Service Channel (SCH) according to the probability distribution of the reservation time for service packet in CCH Interval. Numerical results show that our protocol can significantly improve the performance of WAVE system.
Analysis of Atmosphere Channel for UV Communication in Power Grid
Authors: Zhao Qing Qi , Meng Fan Bo , Zhao Hong Hao , Ma Wei Zhe
Published: September 2013

This paper theoretically analyzes the atmospheric influences on Ultraviolet (UV) communication, in which the main considerations include atmospheric absorption and atmospheric scattering. Through the establishment of mathematical model, this paper describes the atmospheric transmittance with different wavelengths. Finally, the atmospheric transmittance is simulated under different visibilities, rainfall and paths. The results show that the atmospheric transmittance will be different with different wavelengths, visibilities and rainfall. The atmospheric transmittance in horizontal path is larger than that in the vertical path. This research provides a theoretical guidance on the using of UV communication for the information transmission in power grid.
Design and Implementation of Hopping Frequency Sequences with Given Minimum Gap Based on FPGA
Authors: Li Peng Fei , Ma Xiao Chun , Song Jia You
Published: September 2013

In order to design given minimum gap hopping sequences based on dual sub-bands for technology requirement, with Matlab simulation software analysis and optimize system, performance and design idea of hopping sequences of given minimum gap is expounded. The design method based on hardware of given minimum gap hopping sequences based on dual sub-bands is given. System software uses Quartus II8.0 platform and VHDL language. The language has fine characteristics of transplantation, long lifecycle, powerful description and support large scale design and logic unit recycled. The design has parameter adjustment repeating program function and reference application value in design of hopping-frequency communication hardware.
Optimal Spectrum Sensing Interval to Minimize the Transmission Delay for Cognitive Radio
Authors: Li Shuai , Gong Peng , Yang Qian , Li Ming Guan , Ma Lin Chuan
Published: September 2013

In this work, we have studied the optimal spectrum sensing interval, which is the time between two consecutive spectrum sensing activities, such that the delay of the cognitive transmission is minimized. The throughput maximization of the cognitive radio is always a common goal of the researchers, which is keenly related to the delay of the cognitive transmission. Whereas the delay is mostly decided by the spectrum sensing interval for a given primary user (PU) channel. Therefore, we have studied the setting of the spectrum sensing interval to minimize the transmission delay of the secondary user (SU). Especially, the retransmission is considered, which deteriorates the delay of the cognitive transmission; however, neglected by the most studies. Finally, we provide both the optimal setting of the spectrum sensing interval and the numerical values.
Detrended Cross-Correlation Analysis of Epilepsy Electroencephalagram Signals
Authors: Zhao Jun Chang , Dou Wan Hu , Ji Hong Da , Wang Jun
Published: September 2013

The cross-correlation performance between epilepsy electroencephalogram (EEG) signals reflects the status of epilepsy patients which has importance for analyzing long-range correlation of non-stationary signals. For the first time, detrended cross-correlation analysis (DCCA) was applied to analyze different physiological and pathological states of epilepsy EEG signals. It were compared the difference of DCCA values between epilepsy patients EEG signals and normal subjects EEG signals. It was found that the DCCA values of epilepsy patients EEG signals increased compared the normal subjects EEG signals which can be helpful for medical diagnosis and treatment.
Sleep Electroencephalogram Analysis Based on Symbolic Transfer Entropy
Authors: Chang Rui Jun , Liu Yang , Chen Qiu Ping , Wang Jun
Published: September 2013

The quality of sleep has a great relationship with health. The result of sleep stage classification is an important indicator to measure the quality of sleep. It was found that the symbolic transfer entropy about wake and the first stage of non-rapid eye movement sleep reflect on the changes of sleep stage. And it was confirmed by T test and multi-samples experiments. The symbolic transfer entropy can apply into automatic sleep stage classification. By Multi-parameter analysis it could achieve a higher accuracy of sleep stage classification.
An Effective Scheme of M-Ary Spread Spectrum System Based on Orthogonal Spread Spectrum and CPSK
Authors: Liu Yue Xuan , Liang Shu Jian , Ma Yue Huai , Gong Song Xian
Published: September 2013

A hybrid M-ary spread spectrum (SS) communication scheme which combined with orthogonal SS and CPSK technique is proposed. Based on dual orthogonal SS, every SS code is treated as original code to adopt CPSK modulation, the unattached synchronous code is chosen to achieve system synchronization. At the receiver, A circular correlator based on transform domain processing is employed to de-spread the received signals. Compared with M-ary SS and CPSK, the proposed scheme is able to obtain higher bandwidth efficiency, stronger anti-intercept capability, and better synchronous performance. The Monte-Carlo simulation results demonstrate that the proposed scheme can achieve better synchronous and bit error rate (BER) performance under additional white gauss noise channel models.
Drilling Fluid Technology for Extended-Reach Horizontal Wells in Cuba
Authors: Luo Cheng , Qin Yi , Cao Xiao Chun
Published: September 2013

This Extended-reach horizontal wells lies in Guanabo block of Cuba, using the KCl polymer drilling fluid system which has strong inhibition. To strengthen the drilling fluid inhibition, it keeps the concentration of GW FA-367 at around 0.5% in the construction, KCl is 8%~10%, GW POLYCOL is 2% ~ 3%, it also takes the use of other assorted maintenance treatment measures at the same time. The results of application show that, compared with other wells of this region, this well greatly shortens the drilling cycle, reduces the accident rate and the drilling cost, the drilling fluid lubricity is good.
Quadratic Hilbert Transform Demodulation Based on Time-Delayed Correlation Treatment and EEMD
Authors: Xiong Qing , Zhang Wei Hua , Mei Gui Ming
Published: September 2013

To deal with the demodulation problem of rolling bearing defect vibration signal in heavy noise, a new method based on time-delayed correlation algorithm and ensemble empirical mode decomposition (EEMD) is presented. Introduced the time-delayed autocorrelation de-noising principle. After the discretization and unbiased estimation of the original signals autocorrelation function , de-noising pretreatment is implemented by appending a rectangle window. Then an envelope signal can be obtained by the first Hilbert transform. After the EEMD decomposition, some interested intrinsic mode functions (IMFs) can be collected. By making the second Hilbert transform of the IMFs, we can get the local Hilbert marginal spectrum from which the defects in a rolling bearing can be identified. By repeated analysis of simulation signals and actual rolling bearings defect vibration signal, the results show that the proposed method is more effective than direct modulation or only time-delayed correlation demodulation or combine time-delayed correlation with EMD demodulation in de-noising and diagnosing the rolling bearing's defect information.
Extended Sparse Multipath Channel Capacity Estimation Based on Adaptive Array Configuration
Authors: Jiao Jian , Zheng Xue Jiao
Published: September 2013

A virtual representation of the sparse multipath wireless channel model is proposed based on a physical wireless channel, the channel corresponds to a delay in Doppler scattering angle, uniform sampling in signal space dimensions. This virtual representation model, through the antenna array configuration extension on MIMO channel capacity was estimated. The simulation results show that the three typical antenna array configuration enough that the performance of channel optimal at all SNR conditions can be approximated, reconfigurable arrays can achieve channel capacity expansion purposes.
Data Mining for Simple Sequence Repeats in Expressed Sequence Tags from Japanese Flounder (Paralichthys olivaceus)
Authors: Chen Song Bo , Xie Xin Lu , Li Gong , Liu Hai Jin
Published: September 2013

Based on ESTs of Japanese flounder (Paralichthys olivaceus) in the public database, EST-SSR makers were developed after mining and evaluating SSRs in them by bioinformatics methods. 5 927 non-redundant ESTs of Japanese flounder were screened and 390 SSRs were mined out. The frequency of these EST-SSRs was 7.95% and the average distance of distribution was 7.9 kb in non-redundant ESTs. The dinucleotide repest motif was dominant type (59.02%) with repeat motif AC being the most common (16.91%). The distribution of trinucleotide, tetranucleotide and hexanucleotide repeats were dispersive. 30 primer pairs for EST-SSRs were designed, 27 primer pairs showed the amplification, and 17 primer pairs showed polymorphisms, the rates of polymorphic EST-SSRs were 62.96% with the alleles per locus ranging from 2 to 6 (mean 3.5). The observed (HO) and expected (HE) heterozygosities of these EST-SSRs were 0.280.92 and 0.31550.8033, respectively. Two EST-SSR loci significantly deviated from the HardyWeinberg equilibrium (HWE) expectation, and theremaining 15 loci were in HWE. These new EST-SSR markers would provide sufficient polymorphism for population genetic studies and genome mapping of Japanese flounder.
A Folded RFID Tag Antennas Based on Hilbert Fractal Structure
Authors: Yu Yan Zhong , Huang Zhong Yi , Zheng Cai Qiang , Wu Yong Xing
Published: September 2013

Based on Hilbert theory and technique, a folded tag antenna for RFID application is presented in this paper. In order to reduce the size of tag, a Hilbert fractal structure is employed. Additionally, to match flexibly the impedance between antenna and chip, a folded technique is employed. The input impedance of tag antenna can be adjusted easily by changing the high of folded structure. A designed tag antenna dimension is 23.32mm×7.66mm, and its return loss, bandwidth, gain and theoretical detection distance are given at 2.45GHz by HFSS software. The simulation results show that the designed antenna can meet the requirements of the practical applications.
Application in Extraction of Voice Recognition Characteristic for Relief Algorithm
Authors: Gao Lun , Li Tai Fu , Wen Feng
Published: September 2013

Pertaining to the study on voice recognition issue, the characteristic selection study on voice signal is described via Relief Algorithm in this paper, it is started from 24-dimensional MFCC parameters to find out the most important MFCC parameters in the voice signal, under the condition that the recognition ratio doesnt change greatly, the optimized combination is performed for 24-dimensional MFCC parameters to provide a new orientation for characteristic of voice recognition.
Speaker Recognition Study Based on Optimized HMM Algorithm
Authors: Xu Hui Hong
Published: September 2013

The article has carried on the optimization to the HMM algorithms Viterbi algorithm and LBG algorithm, It can be proofed that the optimized algorithm improved the text dependent recognition efficiency throgh experiment.
Real-Time 3D Hand Tracking from Depth Images
Authors: Song Lin , Hu Rui Min , Xiao Yu Lian , Gong Li Yu
Published: September 2013

In this paper, we propose a depth image based real-time 3D hand tracking method. Our method is based on the fact that human hand is an end point of human body. Therefore, we locate human hand by finding the end point from a predicted position of hand based on the hand position of the previous frame. We iteratively grow a region around the predicted position. The end point on the major axis of the region which stops moving with region growing is selected as the final position of human hand. Experiments on Microsoft Kinect for Xbox captured sequences show the effectiveness and efficiency of our proposed method.
Construction of Compactly Supported Orthonormal Symmetric and Antisymmetric Two-Direction Refinable Functions and its Corresponding Wavelet with Scale M
Authors: Li Wan She , Yao Quan Gang
Published: September 2013

In this paper, the concepts and related conclusions of two-direction multiresolution analysis and two-direction refinable functions are introduced; two-direction wavelet with scale 2 is researched and is extended to orthonormal symmetric and antisymmetric two-direction wavelet with scale M and relevant properties are obtained. A condition that stable solution of two-direction refinable functions can create for MRA is given; finally construction of two-direction wavelet by two-direction compactly orthonormal refinable functions is discussed.
Optimization of Multiuser MIMO Relay Systems
Authors: Chen Fang Ni
Published: September 2013

Multiple inputs and multiple outputs (MIMO) relay cooperative transmission, as an efficient solution for high data rate and ubiquitous coverage, is a promising key technology for next generation wireless system. The performance of MIMO relay network is dependent on the signal processing approaches adopted by relay nodes. It is more complex when multiple users are active in MIMO relay network. Considering the minimum MSE problem, two sub-optimal algorithms are proposed based on the properties of relay filters. The simulation results the sub-optimal algorithms give similar results as optimal one.
A Study of Video Transmission Performance in Bluetooth Sensor Networks Based on Slots Analysis
Authors: Liu Bai Qiang , Qian Zhi Hong , Zhang Xu , Li Qian
Published: September 2013

Based on slots consumption, the performance of video transmission in Bluetooth sensor networks was analyzed. On the premise that the maximum gross user payload data rate can satisfied the output bit rate of video source coding, the slots consumption using different packet types to transmit video stream in different SNR was analyzed, and the minimum slots consumption can be obtained by selecting the appropriate packet types to transmit video packets in different SNR, thus the Bluetooth link can vacate more slots for other business.