bluuebunny/crossref_metadata_2025_split huggingface dataset:
An improved Gaussian Mixture Model algorithm for background representation
Authors: Wang Ping , Dong Shaoxiong 
Published: November 2019

Abstract
Initializing a background frame for Gaussian Mixture Model requires no moving objects in the background scene. In this paper, in order to obtain an initial frame when there is a moving object in the background scene, filtering algorithm is used for background frame initialization. This paper proposes an improved method for updating Gaussian mixture models. In the initial stage of the GMM, the update rate of the mean and variance is taken as a larger value, so that the model mean and variance update speed becomes faster, and the model learning speed is accelerated; after training for a period of time with a large update rate, let The mean update rate is unchanged, and the variance update rate becomes smaller, so that the background model can be more stable.
A Synchronization Algorithm for Burst-Mode MR-OFDM System of 802.15.4g
Authors: Zhao Yahong , Zhao Xu , Zhang Yubing , Tang Xiaoke , Dong Mingke 
Published: November 2019

Abstract
This paper presents a refined coarse frame synchronization algorithm for long repeated-sequence based preamble STF (short training field) in burst mode MR-OFDM system of 802.15.4g which is of low decision delay and resistant to timing uncertainty due to metric plateau. The precision of coarse timing and frequency offset estimation is improved. A fine symbol timing and frequency offset estimation algorithm based on LTF (long training field) is also proposed which provides an overall solution for the synchronization of burst mode MR-OFDM system. Simulation results are given to provide reference for implementation.
Research on Shipping Scheme of Express by High-speed Railway Passenger Train
Authors: Yang Jiayi , Zhao Qilan 
Published: November 2019

Abstract
High-speed rail express mainly uses the remaining space of passenger trains for transportation from the originating station to the terminal station. The number of shipments at the intermediate station of the train is small, but the transportation demand at them is also considerable. If the high-speed rail express shipping plan considers the express delivery demand of the intermediate station, it can help the high-speed rail express operation enterprise to increase profits by coordinating the demand of the stations along the global optimal angle. This paper considers the short-term stop time of the high-speed rail, limited train loading space, different timeliness requirements of high-speed rail express products, etc., and establishes the mathematical model of the high-speed rail express shipping scheme. This paper predicts the demand for various products of Beijing-Shanghai high-speed rail express in 2025 and calculate the transportation capacity of B-S HSR. The shipping plan obtained verifies the effectiveness of model.
Grey Evaluation Method of Radar Equipment Supportability Based on G1
Authors: Shi Duanyang , Hu Bing , Chen Jiaxun , Ma Yanyan 
Published: November 2019

Abstract
A comprehensive evaluation method combining grey system theory and order relation analysis (G1) is proposed to solve the problems of various and uncertain factors affecting the supportability of radar equipment. Firstly, according to the requirement of radar equipment supportability, the evaluation index system of radar equipment supportability is constructed. Secondly, order relation analysis (G1) is used to determine the weight coefficient of each evaluation index. Finally, the grey scale and whitening weight function are determined by expert scoring value and grading standard, and the guarantee grade of radar equipment is obtained by using grey evaluation model. The accuracy of this method is verified by an example, which provides a new idea for the supportability evaluation of radar equipment.
Research on ultra-wideband electromagnetic pulse irradiation effect and protection method of Unmanned Aerial Vehicle
Authors: Shukun Gao , Erwei Cheng , Yazhou Chen , Yuming Wang 
Published: November 2019

Abstract
The data link is an important guarantee for the Unmanned Aerial Vehicle (UAV) equipment to complete its battlefield functions. Its anti-electromagnetic pulse interference capability directly affects the airborne communication security. Ultra-wideband (UWB) electromagnetic pulse has become an important source of electromagnetic interference due to its high power, wide frequency band and wide interference target. In order to verify the reliability of UAV data link communication under UWB electromagnetic pulse irradiation conditions, the UWB electromagnetic pulse irradiation effect experiment of UAV was carried out, and the mechanism of “lost lock” effect of UAV data link was analyzed. The experimental results show that when the UWB electromagnetic pulse irradiation intensity reaches 140 kV / m, it will cause hardware damage to the UAV, and found that its internal sensitive device low noise amplifier is damaged. In response to this, the comprehensive design of the electromagnetic protection measures for the UAV was carried out, laying the foundation for the next step to strengthen the electromagnetic protection of the UAV.
Design of a Novel Broadband Microstrip Line-Suspended Microstrip Line Transition Circuit
Authors: Niu Heyi , Wu Jingfeng , Wang Zhiqiang 
Published: November 2019

Abstract
Based on the application requirements of the suspended microstrip circuit, a novel broadband microstrip line-suspended microstrip line transition circuit is designed in this paper. The transition structure uses “V-grooved” ground structure to realize the transition from microstrip line to suspended microstrip line in the direction of electric field, and uses gradient signal line for impedance matching to expand the bandwidth. The final simulation results show that the echo loss of the structure is better than 15 dB and the insertion loss is less than 0.165 dB in the frequency range of 0-40 GHz, and the sensitivity of circuit performance to circuit size is low. This design combines the ultra-low loss suspension line with the most commonly used microstrip line circuit, and has the advantages of broadband, low insertion loss, easy processing and compact structure. It improves the application scope of the suspension microstrip circuit and can be better integrated with other circuits or systems.
Effect of Signal Reflection on the Performance of High-density Ceramic Package Transmission Lines
Authors: Boxian Wu , Hongyu Zheng , Xiaojun Zhang 
Published: November 2019

Abstract
In this paper, the reflection problem caused by the sudden change of characteristic impedance caused by the complex interconnection of laminations and via, pads and interconnects in high-density ceramic package is studied, and the transmission line design optimization is realized. In high-density ceramic package designs, reflections severely affect the performance of the transmission line. Based on the relevant theory of transmission line transmission, the reflection problem is studied by modeling and simulation methods. The transmission line model is constructed by using electromagnetic simulation software, and the obtained return loss represents reflection. The method of controlling variables is used to analyze the factors that affect the reflection. The simulation results show that the anti-pad has a significant impact on the performance of the transmission line, and the influence of via and pads on the performance of the transmission line is second.
Research on Key Test Methods of the Smart Meter Software Based on Failure Modes
Authors: Leping Zhang , Baoshuai Wang , Shanshan Hu , Yi Luo , Yi Pan , Zhanhe Wu 
Published: November 2019

Abstract
Software quality has become a key factor affecting the overall quality of the smart meter. To improve the reliability of the smart meter software, analyzed the typical failure modes and mechanism based on actual failure cases of smart meters. For different software failure modes, the test techniques were studied from the perspective of the software development cycle. Designed a test program of the smart meter software and provided automated test tools to improve the breadth and depth of the software test and improve the product reliability.
Research status of hyperspectral anomaly target detection
Authors: Zhang Yan , Hua Wenshen , Huang Fuyv , Wang Qianghui , Suo Wenkai 
Published: November 2019

Abstract
Hyperspectral imagery is a three-dimensional image of “image-spectrum merging”. Its spectral resolution reaches nanometer level, which provides a theoretical basis for classification, unmixing and target detection of features. Because the anomaly target detection does not need to obtain the prior knowledge of features, it is more widely used in practice and has become a research hotspot. This paper summarizes the development status of anomaly target detection algorithms at home and abroad, and expounds the existing problems. Finally, the development trend of anomaly target detection is prospected.
Research on Fatigue Life of Lifting Equipment Based on Double Linear Cumulative Damage Theory
Authors: Chen Li , Ding Keqin 
Published: November 2019

Abstract
The lifting equipment is applied more and more extensively with the fast development of economy. The fatigue and safety problems of lifting equipment in service are more and more prominent. The stress spectrum monitoring data was analyzed by the two parameters rain-flow counting method for fatigue analysis. The calculation for cumulative damage and prediction for fatigue life of the lifting equipment’s hot region were calculated based on the double linear damage theory and the nominal stress method. According to the engineering application results, the real crack generation time is consistent with that of our estimation, which demonstrates that our prediction model and method for fatigue life are effective and give a method for the evaluation of the lifting equipment’s fatigue life. The double linear damage theory is recommended for use in fatigue and damage prediction of lifting equipment in service.
Analysis of Dynamic Properties for Double-swing Anti-galloping device Used in Long-span Section over Han River in 1000 kV UHV AC Jingmen-wuhan Transmission Line
Authors: Bin Zhao , Lichun Zhang , Jialun Yang 
Published: November 2019

Abstract
The anti-galloping combination mode of “double-swing anti-galloping device + cable cleat rotary spacer” is the anti-galloping scheme which is frequently used at present. In order to enhance the anti-galloping capability of Long-span Section over Han River in 1000 kV UHV AC Jingmen-wuhan Transmission line, this text will research the influence of pendulum’s theoretical length on dynamic properties for the double-swing anti-galloping device, which is widely used in the ultra-high voltage line. Theoretical analysis shows that total mass rate of anti-galloping devices, including double-swing anti-galloping device as well as cable cleat rotary spacer, should reach 6.5%, and the pendulum’s theoretical length shoud be 650mm, then the theoretical anti-galloping capability of whole system became optimized.
Comparison of Full-Area Simulation Method and Separated Simulation Method of Motor Temperature Field
Authors: Wang Wenjie , Suo Shuangfu , Hao Jinshun , Wang Yang 
Published: November 2019

Abstract
Permanent magnet motor has become the main research direction of high power density motor, and the heat dissipation capability of the motor has become an important factor restricting the increase of motor power density. High-power density motor generates higher temperature when it works, and high temperature may cause motor insulation burnout, even irreversible demagnetization of permanent magnets. Therefore, thermal analysis and optimal design of cooling structure are very important for high power density motors. In this paper, a 3-D model of thermal simulation of permanent magnet motor is established, and the temperature field is calculated by two methods. 1. The fluid-solid coupling method is used to calculate the global temperature field of the motor and the cooling structure. 2. The fluid-solid coupling method is used to calculate the convective heat transfer coefficient of the cooling structure, then the heat transfer model is used to calculate the temperature field of the motor body. These two methods are introduced and compared in this paper, and the second method is considered to be well suited for optimal design of motor cooling structures.
Seismic Performance Analysis of Highway Subgrade Retaining Structure
Authors: Lin Tao , Li Jinbei , Zhang Yang 
Published: November 2019

Abstract
Subgrade retaining structure is the most common structure of highway, once it is damaged by earthquake, its damage is universal. Under the action of seismic load, whether the subgrade retaining structure cracks or collapses, and the failure mechanism is one of the key problems in the design of retaining structure in earthquake area. Therefore, it is necessary to systematically study the typical failure mode, failure mechanism and seismic earth pressure of highway retaining structures. In this paper, through the investigation and analysis of earthquake damage law and failure mode of highway retaining structure, combined with numerical model test, the seismic damage mode of highway retaining structure is summarized, and effective seismic reinforcement method is put forward, which provides a certain basis for post-disaster reconstruction of highway structure.
Research on Improving the Success Rate of Electricity Information Acquisition System by Using Medium Voltage Power Line Carrier Communication Technology
Authors: Kang Liyan , Shang Ying , Zhang Muxin , Liu Xinran , Wu Xiaoguang 
Published: November 2019

Abstract
This paper studies the application of medium voltage power line carrier in Electricity Information Acquisition System, discusses the main application scenarios of medium voltage power line carrier, compares three upstream communication modes of medium voltage power line carrier, optical fiber and wireless public network, and summarizes the investment cost, construction and maintenance of medium voltage power line carrier. The field operation proves that the medium voltage carrier communication technology can improve the success rate of Electricity Information Acquisition System.
A small-size and multi-band wearable antenna with coplanar structure
Authors: Jin Xinghui , Zhu Mingmin , Wei Wenjiao , Yu Guoliang , Zhou Haomiao 
Published: November 2019

Abstract
A small-size multi-band wearable antenna with coplanar coupling of radiation patch and ground plane for 4G mobile communication is proposed and discussed in this paper. A coupling strip, a C-shaped slot made of copper foil and a shorting strip are combined to form the proposed wearable antenna with a simple structure and small size of 25×32 mm2. The proposed antenna operates over two frequency ranges, 2308-2841 MHz and 5092-5887 MHz suitable for LTE 2300/2500 MHz, WLAN 2.4/5.2 GHz and ISM 5.8 GHz applications. In addition, the proposed antenna has better stability and it also can cover five frequency bands when the curvature radius is 45 mm and 25 mm in comparison with traditional conductive fabric wearable antennas. The designed antenna is easy to fabricated, small in volume and wide in frequency band that is applicable to most wearable electronic devices in the future.
Functional Location Analysis of Inertia Support and Primary Frequency Modulation of Virtual Synchronous Generator in Power System
Authors: Han Zijiao , Ge Yanfeng , Li Zhengwen , Wang Chenqi , Wang baoshi , Wei Jiapeng 
Published: November 2019

Abstract
With the continuous improvement of renewable energy penetration, the inertia and primary frequency modulation capability of synchronous power grid are declining. If the virtual synchronous generator (VSG) technology is used for renewable energy generation, it can make due contribution to reducing the frequency variation and frequency deviation of the system under the impact of high power gap. The inertia support and primary frequency modulation function positioning in VSG research are not clear. In this paper, the inertia support function of VSG and its physical significance are analyzed, the expression of inertia support power of VSG is deduced, the location distinction between inertia support function of VSG and primary frequency modulation function is analyzed, and the different control function pairs of VSG in the process of large synchronous power grid frequency accident are simulated and analyzed,and study the effect of system frequency variation.
Mobile Digital TV Induction Array Four Helix Antenna
Authors: Pan Yilang , Li Zhenchang , Tang Di , Yan Yipeng , Chen Linpeng , Li Huiru 
Published: November 2019

Abstract
According to the performance requirements of the mobile digital TV system, the present paper originally combines polygonal four helix antenna, induction array antenna, dielectric constant gradient film, graphene conductive ink and nano silver conductive ink, designed a mobile digital TV inductive array four helix antenna. The result of test indicates that this antenna has completely covered the frequency band of the mobile digital TV system. This antenna has strong corrosion resistance and damage resistance, stable physical and mechanical performance and radiation performance, small size, thin thickness and large working bandwidth, so it has broad application prospects.
Design of Broadband Micro-Power Wireless Communication Test System Based on TTCN-3
Authors: Tian Le , Chang Suhua 
Published: November 2019

Abstract
In order to optimize the network architecture, narrowband micro-power wireless communication technology is developing towards broadband. In order to ensure the conformance of the functions and protocol standards of the developed broadband micro-power wireless communication module and the interconnection of different manufacturers, it is particularly important to test the products. Based on TTCN-3 and Titan platform, a conformance testing system for broadband micro-power wireless communication protocol is designed. The hardware and software implementation scheme of the conformance testing system is given, and the implementation mechanism and key technologies of each part of the system are described. An interoperability testing platform is constructed to realize the integrated distribution network testing and interoperability testing. Protocol conformance testing cases are designed by using black box testing method. It provides a test basis for the research of broadband micro-power wireless communication.
Study on Outdoor Terminal Box Moisture-proof Measures
Authors: Feng Lei , Wang Zhen 
Published: November 2019

Abstract
The paper analyzes the components of outdoor terminal box, and studies the mechanism of outdoor terminal box moisturizing according to the relationship between temperature and humidity, and proposes the main ideas of moisture-proof outdoor terminal box. Through wide range of investigation, the paper teases out the current moisture-proof measures of outdoor terminal box and analyzes the effect of each measure according to the actual operation. By counting the damp defects of outdoor terminal box, the paper analyzes the hidden danger of outdoor terminal box moisturizing and the reasons why the frequency of some terminal boxes moisturizing is high. Finally the paper proposes some advice for moisture-proof measures of outdoor terminal box in southern area.
Reduced-Dimension DOA and Polarization Parameters Joint Estimation Method for Electromagnetic Vector Sensor Array
Authors: Fu Xinying , Wan Tao , Wang Shixin 
Published: November 2019

Abstract
MUSIC algorithm is a very typical algorithm in the joint estimation of DOA and polarization parameters. But the two spectral peak searches of two-dimensional parameter space in the algorithm cause a damaging effect on calculation, which limits the application of the algorithm in practice. Therefore, this paper proposes a joint estimation algorithm of dimensionality reduction DOA and polarization parameters based on successive MUSIC in the case of uniform linear array arrangement of the electromagnetic vector sensor. The proposed algorithm improves the classical MUSIC algorithm from two two-dimensional parameter searches to four one-dimensional parameter searches in the joint estimation of DOA and polarization parameters, which greatly reduces the computational complexity of the algorithm and can lead to the automatic matching of DOA and polarization parameters. Simulation results show that the computational complexity of the proposed algorithm is reduced by 104 orders of magnitude compared to the classical MUSIC algorithm. And the performance of the polarization parameter estimation of this algorithm is about 72%∼85% higher than that of the ESPRIT algorithm. Therefore, the algorithm is more applicable.
A Design of Ultra-low Phase Noise Frequency Source Based on High Phase Detection Frequency
Authors: Geng Dong , Liu YingKun , Guo WengSheng , Zhang JiaCheng , Zhang XueRen 
Published: November 2019

Abstract
This paper introduces a design of ultra-low phase noise frequency source based on high phase detection frequency. Frequency source is a very important part of modern electronic system. Radar, communication, space technology and so on are inseparable from frequency source. Its performance index directly affects the whole electronic system, and phase noise is one of the most important indicators. In this paper, the scheme of phase-locked technology with high phase detection is mainly used,the phase noise is better than -116dBc/Hz@1kHz, -120dBc/Hz@10kHz, -121dBc/Hz@100kHz when the output frequency is 4.5GHz. The technology of high phase discrimination and low phase noise frequency synthesis in this paper can also be extended to higher and more special frequency bands. It provides a solution of ultra-low phase noise for frequency sources of modern radar, electronic jamming and countermeasure systems.
A 5-15GHz Switchless Broadband Monolithic Integrated Bidirectional Amplifier
Authors: Wang Mengtan , Yao Zhihong , Xu Yongxiang 
Published: November 2019

Abstract
Based on SiGe HBT technology, two broadband monolithic integrated bidirectional amplifiers (BDA) with different operating voltages (1.8V/3.3V) are designed. By adjusting the bias voltage, the transceiver and receiver of the amplifier are switched. At the same time, a temperature compensation bias circuit is added to reduce the high and low temperature gain variation of the amplifier. It is suitable for multi-function transceiver chip or T/R module. The simulation results show that the gain of 1.8V broadband monolithic integrated bidirectional amplifier can reach 9dB in 5-15GHz operating band, the reflection coefficient of input and output ports is less than - 13dB and - 17dB respectively, the output power of 1dB compression point is + 5.5dBm, the working current is 12.2mA, the gain of 3.3V bidirectional amplifier can reach + 10.5dB, and the reflection coefficient of input and output ports is less than -12dB and -13dB. The output power of 1dB compression point is + 10dBm, and the working current is 20.3mA. The core area of the chip is 0.45 × 0.45mm2.