bluuebunny/crossref_metadata_2025_split huggingface dataset:
An active set approximation method for the design of broadband beam former
Authors: Tan Xiaofen , Xiao Mei , Feng Zhiguo 
Published: December 2019

Abstract
The microphone array beam former design problem in far-field environment is to design the coefficients of FIR filters such that the maximum error between the actual response and the desired response in a specified domain is minimized. The specified domain is always very large and this problem is a large scale optimization problem. In general the complexity of the optimal method for solving this problem is very expensive. In this paper, we apply an active set approximation method to solve this problem. First, we transform this problem into a semi-infinite programming problem. Next, we find an approximate active set such that the scale of the problem can be mostly reduced. Then, this problem can be solved efficiently and the approximate solution is very close to the optimal solution. Numerical experiments are illustrated to show the efficiency of the proposed method.
Multi-User Concurrent Job Scheduling Method of Network Analysis Application Based on CPU/GPU Cluster
Authors: Luo Yadi , Li Jing , Lu Jun , Guo Ziming , Yan Bo , Ning Wenyuan 
Published: December 2019

Abstract
Multi-channel multi-core CPU parallel and CPU+GPU heterogeneous parallel are effective means to enhance Network Analysis Application computing. To solve the job scheduling problem of Network Analysis Application with multi-level dispatching, multi-user, multi-task in CPU/GPU heterogeneous cluster environment, a multi-user concurrent job scheduling method for Network Analysis Application in CPU/GPU cluster is proposed. According to the characteristics of Network Analysis Application, it is suggested that state estimation and dispatcher power flow should be accelerated in parallel with CPU, while static security analysis, perturbation power flow calculation and interruption capacity scanning should be accelerated in parallel with CPU+GPU. The job scheduling method proposed in this paper can satisfy the high concurrent requests of multi-level Dispatching & Control Center in the isomorphic and heterogeneous computing environments.
Research on the Improvement of Airport Comprehensive Support Capability Based on Data Mining
Authors: Zhang Xiuming , Xue Jianhai 
Published: December 2019

Abstract
The “integrated airport support capability” is a general term for all the ground support capabilities in the airport relative to the sky. For the protection of the airport, especially during peak hours, it is necessary for multiple units to coordinate and participate together. The best guarantee of the apron in an airport is the operational efficiency during peak hours. This paper firstly identifies the support capacity of an airport during peak hours, and then analyzes the data of the airport peak period, so it is concluded that those factors play an important role in the key guarantee of the airport peak and the key guarantee for the airport. The factors put forward the opinions of optimization, which can greatly enhance the comprehensive support capability of the airport.
Research on Space Wireless Drive Mechanism Based on Wireless Measurement and Control Network Technology
Authors: Zhang Yongjie , Hu Bin 
Published: December 2019

Abstract
In this paper, a new design scheme based on ZIGBEE network technology is proposed for the space wireless drive assembly, and preliminary experimental verification is obtained. The space wireless drive assembly based on ZIGBEE network technology can effectively reduce the weight of the drive assembly, improve the life, and compare the performance of the traditional drive assembly with the wireless drive assembly, which provides a useful basis for subsequent research.
Research and Analysis of Electromagnetic Thrust of Variable Pole Distance Linear Induction Motor
Authors: Liu Xijun , Gao Lixia , Liu Xiaohan , Peng Xu , Yang Guolong , Mou Shirong 
Published: December 2019

Abstract
According to the actual acceleration index requirements, a high-speed large-thrust linear induction motor for accelerating the system was designed. Due to the variable pole pitch design, the variation of the pole pitch plays a key role in the design, and the influence of the variation of the pole pitch on the output of the electromagnetic thrust is analyzed. The variable pole distance double-sided linear induction motor is used as the acceleration drive. It does not need to detect the speed and displacement. The primary winding current frequency is constant. As the speed increases, it will not be limited by the inverter frequency, and will not increase the motor loss. The frequency is constant and the control is optimized and simpler.
DC Motor Speed Control System Based on PI Controller
Authors: Zhao Xiangyu 
Published: December 2019

Abstract
This paper designs a closed-loop DC motor drive speed control system based on PI regulator [1], which has the advantages of dead zone control, simple structure and high stability. The system main control is a MCU, with peripheral functions such as key input and liquid crystal display, and human-computer interaction is good. The H-bridge driver circuit adopts discrete component design, and adds IR2104 half-bridge driver with bootstrap circuit to realize control of MOS transistor. In addition, the logic circuit added in the circuit realizes one PWM signal to drive the motor, which reduces the requirement of the single chip microcomputer, and uses less single chip resources to achieve the same driving effect. The PI controller based on the op amp design allows the system to effectively track the speed and the speed can be stabilized to a given value.
Research on Test System of Signal Interference Resistance of Power Communication Carrier Channel
Authors: Li Guochang , Li Ji , Liu Heng , Song Weiqiong , Xian Huizhu , Luo Yizhao 
Published: December 2019

Abstract
In view of the current low-reliability and low accuracy of power line carrier communication performance test equipment in the anti-interference performance test, the article deeply analyzes the technical implementation of the test system and the key technology requirements of anti-interference test. The electromagnetic conduction and radiated crosstalk and its multipath interference existing in the test system frame structure are studied, and the communication performance test system of the point-to-point carrier communication module is designed in the low-voltage power line channel environment. The test system has a simple structure and strong practicability. It can realize point-to-point communication error rate test and effective communication rate test, and can comprehensively evaluate the performance of the communication module according to the test result, and can horizontally compare the communication performance of the carrier communication modules of different manufacturers. The communication performance of different types of carrier communication units of the same manufacturer can be compared vertically, and the versatility is strong.
Diagnosis and Research on Local Overheat Fault of Main Transformer
Authors: Li Peng , Ma Xin 
Published: December 2019

Abstract
The main transformer is a transformer used to deliver power to a power system or user in power plants and substations. This paper introduces the use of infrared imaging detection technology and gas chromatography analysis technology as the main means to accurately diagnose a local transformer overheating fault. The article elaborates the diagnosis method, diagnosis process and treatment suggestions, and deeply analyse the causes of the local transformer overheat fault, and provides reference for the diagnosis and analysis of the same type of transformer fault.
DDS-Based Flexible UWB Pulse Generator Using Anti-Nyquist Sampling Theorem
Authors: Wang Qingping , Wang Chang , Xie Tao , Huang Jingjian , Yuan Naichang 
Published: December 2019

Abstract
A real all-digital and all-coherent arbitrary ultra wideband pulse generator is presented. The generator is a multi-core & single-channel (MCSC) direct-digital-synthesizer (DDS) which consists of 16 sub-cores and a high speed digital analog converter AD9739. The ultra-wideband pulses are generated according to the proposed anti-Nyquist sampling theorem. Their frequencies are aliasing in the first and second Nyquist zones. By purposely aliasing the spectrum, the output bandwidth can be increased greatly. All the parameters including pulse width, bandwidth, amplitude, pulse type, pulse repeat frequency and modulation are user-controlled on-the-fly. In order to test the performance, monopole pulse, monocycle pulse and two 4th order Gaussian pulses are generated. The monopole pulse whose pulse rate can achieve 2.5 GHz has a 10% pulse width of 450 ps, a 200 mV peak amplitude and a -10 dB bandwidth of 2.15 GHz.
Design of transformer secondary voltage drop on-line monitoring system based on Internet of things
Authors: Hao Yanjun , Chen Honggang , Zhang Taoyun , Zhang Yugang , Wen Dingjun , Zhang Kun , Chen Mingxia 
Published: December 2019

Abstract
The “two sessions” of the company in 2019, the company’s chairman, Comrade Kou Wei, put forward the strategic goal of “three-type two networks, world-class”, making it clear that the 2021 will initially become a world-class Energy Internet company with Global Competitiveness It has also laid out key tasks in the distribution sector, including the strategy for vigorously fighting poverty through services and rural revitalization, making continuous efforts to improve the business environment for electricity generation, upgrading the construction of power distribution networks, and establishing standards and demonstration zones for power distribution networks. The company proposed the “1135” New Era Power Distribution Management Strategy: customer-centered, to improve power supply reliability as the main line, to strengthen standardized construction, lean operation and maintenance, intelligent management and control, we will endeavor to build a first-class modern distribution network with good structure, equipment, technology, management and service. By improving the distribution network’s ability of intelligent perception, data fusion and intelligent decision-making, a “clean, low-carbon, safe and efficient” intelligent distribution network energy system is constructed. The comprehensive error of electric energy measurement in distribution network is composed of voltage transformer error, current transformer error, watt-hour meter error and voltage drop of secondary circuit of voltage transformer. The measurement error caused by the voltage drop of the secondary circuit of the voltage transformer accounts for a large proportion of the total errors of electric energy measurement. Because the voltage drop is too large, causes the little electricity quantity as well as the generation and supply quantity imbalance, the line loss gives the negative number the example all to appear.
Differential Game Research on the Development of New Energy Automobile Enterprises under the Background of Subsidy Retreat
Authors: Tian Yuan 
Published: December 2019

Abstract
Under the background of the government’s subsidy for new energy vehicles, this paper takes a secondary energy supply chain composed of a new energy automobile enterprise and an online car-hailing platform as the research object. Considering the long-term dynamic characteristics of cooperation between new energy automotive enterprise and online car-hailing platform, this paper constructs a differential game model of automotive enterprise and online car-hailing platform under decentralized decision and centralized decision, and obtains their equilibrium strategy and optimal profit function under the two situations, as well as the optimal trajectory of automotive carbon emission reduction over time. The research finds that: compared with decentralized decision, under the centralized decision, new energy automobile enterprise increase its efforts in emission reduction, and the operation efforts of online car-hailing platform increase. Pareto improvement is achieved in the profit of supply chain, and the carbon emission reduction of automobiles is improved. Finally, the model is verified and analyzed by numerical experiments.
Design of Intelligent Drifting Ball for Pressure Pipeline Inner Inspection Using Ultrasonic Technique
Authors: Du Xingji , Wang Min , Miao Cunjian , Ling Zhangwei 
Published: December 2019

Abstract
There are often corrosion and scaling on the inner wall of industrial pressure pipes. The spherical detector for pipeline internal inspection was proposed in the paper. The detector could be rolled with the fluid movement and collected a variety of information along the way by equipped with sensors such as ultrasonic probes. The presence and precise positioning of defects could be determined. The mechanical structure is the carrier of the spherical detector. One of the characteristics of spherical detector is that a number of probes are arranged on the spherical surface. In order to realize the above structure design, an algorithm for generating probe position was studied, and the probe is placed on the spherical shell by using this algorithm. The experimental results show that the mechanical structure has stable motion attitude. And the detector has good sealing performance, pressure resistance and internal structure layout. The research results of paper lay a foundation for the precise positioning of defects, and have important significance for ensuring the safe operation of pressure pipelines.
sorless Model Predictive Current Control by Using HF Pulsating Injection Method for PMSM Drive System
Authors: Lan Dongliang , Li Haoyuan , Yu Shengbin 
Published: December 2019

Abstract
This paper presents the high frequency (HF) pulsating injection method based sensorless control combined with model predictive current control (MPCC) for permanent magnet synchronous motor (PMSM). The use of MPCC makes the implementation of sensorless algorithm difficult due to the lack of a modulator. Therefore, HF current signal is injected instead of normal voltage signal, which is more suitable for MPCC rather than filed orient control (FOC). Besides, three-vector-based MPCC is utilized, which can reduce the current ripple effectively and improve the steady-state performance. Finally, simulation results demonstrate the feasibility and effectiveness.
The Research on Logistics Efficiency and Otherness on Primary Zone of Jilin Province
Authors: Liu Haidong , Tang Jingzhuo 
Published: December 2019

Abstract
Logistics efficiency is a very important index for measuring the development quality of logistics industry and even region economies. In this paper, the index system upon the logistics efficiency of primary zone of Jilin province were constructed and the logistics efficiency were calculated by Malmquist-Dea Model. The result showed that the logistics efficiency had been generally declining in recent year, the logistics efficiency overall level is not high and the region differences still exist. The results also indicated that the scale efficiency change can promote total factor productivity (TFP) but the technology change hinder the development of TFP.
Analysis of the Influence of Aviation Logistics on the Regional Ecological Economic Development of Jilin Province
Authors: Feng Miao , Tan Qing , Lv Xing 
Published: December 2019

Abstract
With the economic development entering the stage of normalization, ecological and globalization, aviation logistics has become a growth point of economic development and has become an important force to promote regional ecological economic development. It can more effectively promote regional industrial division of labor and optimal allocation of resources. The industrial structure upgrade of the service area will be more professional and planned. Taking the aviation logistics of Jilin Province as an example, this paper explores the relationship between its development and the regional economy of Jilin Province, and punishes quantitatively and qualitatively, and discusses the important contribution of aviation logistics to the regional economic development of Jilin Province.
A New High-speed Drive Topology of Wide-bandgap Power MOSFET Based on Dynamic Procedure Model
Authors: Zhao Chuang , Guo Wenyong , Zha Wenhan , Cao Shaoqun , Yang Benkang , Gao Huijuan , Cai Yang , Tian Chenyu 
Published: December 2019

Abstract
More and more attention is being drawn on the wide-bandgap power MOSFET, for its performance is far superior to the traditional silicon MOSFET. Driving technology is one of the key factors that influence the performance of device. In this paper, a high-speed drive circuit topology is proposed. The principle of the improved drive circuit is simple and easy to be implemented. Compared with the traditional design, it can reduce the switching time while maintaining the original driving performance.
Structural Strength Analysis of Gearbox Casing Based on ABAQUS
Authors: Tang Xiaohan 
Published: December 2019

Abstract
In order to improve the transmission accuracy, static and dynamic characteristics of the transfer gearbox of a test bench, a numerical model is built by finite element software ABAQUS to analyze its static characteristics. The static analysis under typical working conditions are investigated to obtain the stress and the strain, and then the static reliability of the structure is checked, which provides theoretical basis and guidance for the structural optimization design of the gearbox. The research shows that the gearbox structure is reliable and has greater space for structure optimization, which can improve the transmission accuracy and static characteristics.
The Study of Chromaticity Optimization for Photo Alignment IPS LCD
Authors: Zhang Yu , Song Yanjun , Zhao Yongchao , Zhao Rentang , Hsieh Chung-Ching , Zhang Shengdong 
Published: December 2019

Abstract
The new methods of optimization of chromaticity for IPS mode have been presented. We have investigated the effect of the alignment angle on the panel chromaticity base on a new photo alignment material composition. The chromaticity of panel also can be improved by optimizing the angle between LC initial orientation and pixel metal electrode for red, green and blue pixel, respectively.
The Analysis of DC Fault during the Hybrid MMC Start-up Process
Authors: Han Lei , Jiang Junfeng , Yao Haitao 
Published: December 2019

Abstract
The hybrid Modular multilevel converter(MMC), which includes both full-bridge sub-modules (FBSM) and half-bridge sub-module (HBSM), has DC fault ride-through capability and is receiving more and more attention.Current researches are focused on the DC fault in the normal operation of the system.However, there is a lack of analysis of the DC fault during start-up process.This paper introduces the characteristics of the pole to pole fault during the start-up process and analyzes the effect of the pole to pole fault on the sub-module charging.Simulation in PSCAD/EMTDC is implemented to verify the correctness of analysis in this paper.Based on that, new suggestions for DC fault protection are proposed.
Low-voltage power supply system based on three-phase to two-phase and integrated power quality control method
Authors: Guo Cheng , Yang Lianghui , Zhang Liyan 
Published: December 2019

Abstract
The two-input single-phase transformer is widely used in the 10kV power distribution system. However, this power supply mode has the disadvantage of the 10kV side three-phase unbalance problem. In response to this problem, the paper proposes a new 220V single-phase low-voltage power supply system based on a three-input single-phase transformer. The power supply system consists of a three-phase transformer and a two-phase transformer and a phase-to-phase power controller. The three-phase to two-phase transformer is used to realize two low-voltage single-phase power supply, and the phase-to-phase power controller is used to realize the negative sequence and harmonic control of the low voltage side. This power supply mode is suitable for large-capacity low-voltage power supply systems with single-phase load intensive. The paper analyzes the transformation theory and control strategy of the power supply mode. Finally, the superiority and effectiveness of the proposed technical scheme and control strategy are verified by simulation analysis.
Research on Application Validation Methods of Electrical Performance of TVS
Authors: Liu Yanqiu , Quan Li , Zhu Hengjing , Wu Licheng , Wang Wenyan , Zhang Hongwei , Luo Lei 
Published: December 2019

Abstract
Transient Voltage Suppressor (TVS), as an effective protective device in the form of diode, has found wider application in power circuits and signal circuits, which aims to protect secondary power and signal circuits. TVS only operates in case of circuit abnormality, which however is hard to be simulated, and it is also hard to measure whether such abnormality damages other circuits, thus it is necessary to carry out comprehensive application validation on such devices. A validation method about the electrical performance of TVS has been studied in the paper, which is analyzed based on application demands, and the test items and test method for electrical performance validation have been devised as well. Based on this method, the electrical performance of BSY6125 TVS manufactured by Beijing Microelectronics Technology Institute has been subjected to application validation, with a comprehensive evaluation on the electrical performance of the device achieved. This method can also be promoted in the application validation of other TVS.
Research on Modeling and Control of Tilting Three-rotor UAV
Authors: Wang Baocai , Luo Zirong , Shang Jianzhong , Xia Minghai 
Published: December 2019

Abstract
The tilting trirotal UAV is a new type of aircraft that combines the characteristics of fixed-wing UAVS and multi-rotor UAVS. To study and solve the control problems of tilting rotor UAVs, This paper focuses on the mechanical analysis of the rotor mode, and establishes the mathematical model. Simulation of rotor flight mode in MATLAB/SIMULINK environment, provides strategies for the design of tilting rotor UAV control systems.
Regional Protection Device of Reaction Ground Fault and Fault Determination Method
Authors: Deng Demao , Hu Bingxuan , Ren Tinghao 
Published: December 2019

Abstract
With the application of new technology and development of new energy, more and more distributed power sources are connected to the grid. A regional protection device and fault determination method are designed, as a result of failure to swiftly, efficiently and accurately identify, locate and cut off the fault in regard of ground fault reflection of distribution network, to solve the technique problems of variation of load distribution in distribution network, and the invalidation of segmental protection coordinated by time alone when massive distributed generation is input into operation. And designed a type of regional protection device.
Construction and Experimental Study on Subjective Evaluation System of Braking Performance of New Energy Vehicle ABS System
Authors: Hu Zongmei 
Published: December 2019

Abstract
Based on the defects of the objective evaluation index of braking performance of new energy vehicle ABS system, this paper constructs the subjective evaluation system of braking performance of New energy vehicle ABS system by using analytic hierarchy process (AHP), and designs subjective evaluation test table for ABS system and carries out road test.The test results show that the constructed ABS subjective evaluation system test is consistent with the objective evaluation index, and can feedback the driver’s subjective feelings, which can be used as the final evaluation of the new car market.