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12th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2020

作者： Lodhi, Ehtisham Lina, Wang Pu, Yang Javed, M. Yaqoob Lodhi, Zeeshan Zhijie, Jiao Javed, Usman School of Automation Science and Electrical Engineering Beihang University Beijing100191 China State Key Laboratory for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing 100190 China Department of Electrical and Computer Engineering COMSATS University Islamabad Lahore54000 Pakistan Department of Electrical and Computer Engineering COMSATS University Islamabad Abbottabad22060 Pakistan Guo China-US Photonics Lab Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China

ISBN: (纸本)9781728170817

The prediction and forecasting of faults occurring in photovoltaic (PV) system is one of the important aspect to escalate the reliability, output power generation, proficiency, lifetime and effectiveness of overall system. In this article, the behavior of PV array is studied under various faulty circumstances and new approach has offered for the better performance assessment of PV array. This approach is established on the analysis of peculiarities displayed by voltage power (V-P) and voltage-current (V-I) characteristics curves of PV array under different faulty conditions. The proposed technique can be used to identify and classify the five common faults in PV system. These progressive faults (includes open circuit, line-to-line, partial shading, degradation and bridging faults) have been occurred at the basic components of PV cell and at the connection point between PV modules. The characteristic curves under normal and faulty conditions have been compared by utilizing Matlab/Simulink environment. Hence, the suggested method can be utilized to determine the important fact about the health PV array. © 2020 IEEE.

关键词： Solar panels

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Surface Charging Phenomena on HVDC Spacers for Compressed SF_(6) Insulation and Charge Tailoring Strategies

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CSEE Journal of Power and Energy systems 2020年第1期6卷 83-99页

作者： Chuanyang Li Yuan Xu Chuanjie Lin Geng Chen Youping Tu Yao Zhou Zhipeng Lei Tao Han Simone Vincenzo Suraci Jian Wang Weidong Liu M.Tariq Nazir Shun He Andrea Cavallini Giovanni Mazzanti Davide Fabiani Jinliang He Electrical Insulation Research Center Institute of Materials ScienceElectrical and Computer EngineeringUniversity of ConnecticutStorrsCT 06269USA. China Electric Power Research Institute Beijing 100192China Department of Electrical Electronicand Information Engineering“Guglielmo Marconi”University of BolognaViale Risorgimento 2Bologna40136Italy State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Beijing Area Major Laboratory of High Voltage and Electromagnetic Compatibility North China Electric Power UniversityBeijing 102206China Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control National and Provincial Joint EngineeringTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Smart Grid of Education Ministry School of Electrical and Information EngineeringTianjin UniversityTianjin 300072China School of Mechanical and Manufacturing Engineering University of New South Wales SydneyNSW 2052Australia Electric Power Research Institute Yunnan Electric Power Grid Co.ltd.KunmingYunnan 650217China

Surface flashover of spacers is a key factor limiting the application of HVDC GIS/GIL,while the charge accumula-tion on the surface of the spacer could have a potential adverse effect on the surface flashover *** paper discusses the laws regarding distribution patterns of surface charges and the related *** field-dependent property is discussed in detail to comprehensively illustrate the charge transport mecha-nism and explain the research differences regarding different surface charge patterns obtained by previous *** addition,the main surface charge control methods for epoxy resin are summarized and *** potential research directions of charge control methods and key points in manufacturing of spacers used in HVDC GIS/GIL are also explored.

关键词： GIL HVDC insulator SF6 surface charge accumulation surface flashover

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基于红外相机数据估算浙江省开化县野猪种群数量

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兽类学报 2023年第5期43卷 523-532页

作者：陈小南田佳刘鸣章申云逸余建平刘锋申小莉李晟钱江源国家公园管理局北京大学生命科学学院 Department of Electrical Engineering and Computer Science Laboratory for Information and Decision Systems Massachusetts Institute of Technology 浙江省开化县林业局中国科学院植物研究所植被与环境变化国家重点实验室

野猪(Sus scrofa)具有较强的繁殖力和对多种环境的适应能力，近年来在我国多地出现种群明显增长，因野猪损毁农林作物、伤人而引发的人兽冲突事件频发。为针对野猪的计划性捕猎与种群管理提供科学支持，本研究以浙江省开化县为例，基于... 详细信息

野猪(Sus scrofa)具有较强的繁殖力和对多种环境的适应能力，近年来在我国多地出现种群明显增长，因野猪损毁农林作物、伤人而引发的人兽冲突事件频发。为针对野猪的计划性捕猎与种群管理提供科学支持，本研究以浙江省开化县为例，基于红外相机实地调查数据对野猪种群数量进行估算。选用开化县2020年9—10月429个位点的红外相机监测数据，包括有效相机工作日23 690 d，共记录到964次野猪的独立探测。利用Royle-Nichols模型，结合地形、植被、人类影响的环境变量因子和野猪家域面积参数，估计了野猪种群密度及分布。结果显示，研究区内野猪数量为(5548±2343)头(mean±95%C. I.)；在与野猪家域面积大小相当的网格中，野猪的平均种群密度为每平方千米(2.38±0.61)头(mean±SD)；野猪密度与海拔和居民点密度呈负相关关系，与森林覆盖率呈弱正相关关系。基于以上结果，结合实际管理需求，建议研究区域内的野猪捕猎活动选择在其种群密度较高的农田、种植园以及森林与农田交错区域开展。当地主管部门与钱江源国家公园未来应依托系统布设的红外相机监测网络，整合捕猎获取的个体信息记录和其他来源的数据，修正和完善种群动态模型，建立长期种群动态监测机制。

关键词：野猪种群管理人兽冲突计划性捕猎种群密度估计红外相机

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Phonon modes and Raman signatures of MnBi2nTe3n+1(n=1,2,3,4) magnetic topological heterostructures

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Physical Review Research 2022年第1期4卷 013108-013108页

作者： Yujin Cho Jin Ho Kang Liangbo Liang Madeline Taylor Xiangru Kong Subhajit Ghosh Fariborz Kargar Chaowei Hu Alexander A. Balandin Alexander A. Puretzky Ni Ni Chee Wei Wong Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of California Los Angeles California 90095 USA Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Phonon Optimized Engineered Materials (POEM) Center Department of Electrical and Computer Engineering University of California Riverside California 92521 USA Department of Physics and Astronomy and California Nano Systems Institute University of California Los Angeles California 90095 USA

An intrinsic antiferromagnetic topological insulator MnBi2Te4 arises when intercalating a Mn-Te bilayer chain in a topological insulator, Bi2Te3. We present observations on the inter- and intralayer phonon modes of the generalized MnBi2nTe3n+1(n=1,2,3,4) family using cryogenic low-frequency Raman spectroscopy with various polarization configurations. Two peaks at 66 and 112cm–1 show abnormal perturbation in Raman linewidths below magnetic transition temperature due to spin-phonon coupling. In MnBi4Te7, Bi2Te3 layers induce Davydov splitting of the A1g mode around 137cm–1 at 5 K. The out-of-plane interlayer force constant estimated using the linear chain model was (3.98±0.14)×1019N/m3, three times weaker than that of Bi2Te3. Adding more Bi2Te3 layers, such as MnBi6Te10 and MnBi8Te13, makes Bi2Te3 properties more dominant than magnetic properties. Our work experimentally and theoretically discovers the dynamics of phonon modes of MnBi2nTe3n+1 family, facilitating utilization of magnetic topological heterostructures.

关键词： Magnetic order Topological insulators Raman spectroscopy

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A Character Recognition Method for Chip Surface Characters Based on Text Replacement

SSRN

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SSRN 2022年

作者： Xu, Wei Shi, Yecun Xi, Yu Liu, Jingyue Wang, Tan Zhang, Haichao Guo, Cuijuan Bai, Jinjun Xu, Degang Yao, Jianquan Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems School of Electronic and Information Engineering Tiangong University Tianjin300387 China Microelectronic Device Reliability Laboratory Research Test Center of Defense Technology for Aerospace Science and Industry Beijing100854 China Department of Electrical and Computer Engineering Northeatern University BostonMA02115 United States School of Precision Instruments and Optoelectronics Engineering Institute of Laser and Optoelectronics Tianjin University Tianjin300072 China

Due to the particular screen printing rules defined by the unique chip manufacturer and the huge variety of chips, it is difficult to identify chip information by naked eye in chip reliability detection. Automatic identification character technology can help us obtain the information of the chip. But the special character samples in the dataset is extremely uneven. When recognizing characters on chip surface by deep learning, the limited certain characters dataset will reduce the recognition accuracy. A character recognition method for chip surface characters based on text replacement is proposed in this paper. Firstly, the efficient channel attention modules are added to enhance the feature extraction of characters in the text style transfer process. Secondly, the dilated convolution layers are used to replace the residual module during the background restoration process, which help to obtain a more comprehensive background texture feature. Finally, a one-stage target detection network YOLOv5s is used to detect the characters on the chip surface. The experimental results demonstrated that the three evaluation metrics for image generation quality (l2 error, psnr, and ssim) achieved better performance than previous work due to the text replacement network. The overall charac- © 2022, The Authors. All rights reserved.

关键词： Convolution

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Structural reduction of CRNs with linear sub-CRNs

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IFAC-PapersOnLine 2021年第14期54卷 149-154页

作者： Katalin M. Hangos György Lipták Gábor Szederkényi Systems and Control Laboratory Computer and Automation Research Institute P.O. Box 63 H-1518 Budapest Hungary Department of Electrical Engineering and Information Systems University of Pannonia Veszprém Hungary Faculty of Information Technology and Bionics Péter Pázmány Catholic University Budapest Hungary

A novel systems theory-based structural reduction method is proposed in this paper that can be applied to chemical reaction networks (CRNs) including subsystems consisting of linear reactions, i.e. a linear sub-CRN. The reduced model is a delayed CRN with distributed delays having less complexes (monomials) and reactions than the original model. The reduction is based on the fact that the input/output response of a linear sub-CNR can be seen as a time-delayed input to output relationship, therefore linear sub-CNRs can be interpreted as reactions with distributed delay from their input to their output complexes. The practically important example of a kinetic model describing the spread of the COVID-19 epidemic is used as a case study to illustrate the basic concepts and the computation method.

关键词： Delay Model reduction Chemical Reaction Networks COVID

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A soft-aided staircase decoder using three-level channel reliabilities

arXiv

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arXiv 2021年

作者： Lei, Yi Chen, Bin Liga, Gabriele Balatsoukas-Stimming, Alexios Sun, Kaixuan Alvarado, Alex The School of Computer Science and Information Engineering Hefei University of Technology China The Electronic Systems group Department of Electrical Engineering Eindhoven University of Technology Netherlands State Key Laboratory of Information of Photonics and Optical Communications Beijing University of Posts and Telecommunications China Group Department of Electrical Engineering Eindhoven University of Technology Netherlands

The soft-aided bit-marking (SABM) algorithm is based on the idea of marking bits as highly reliable bits (HRBs), highly unreliable bits (HUBs), and uncertain bits to improve the performance of hard-decision (HD) decoders. The HRBs and HUBs are used to assist the HD decoders to prevent miscorrections and to decode those originally uncorrectable cases via bit flipping (BF), respectively. In this paper, an improved SABM algorithm (called iSABM) is proposed for staircase codes (SCCs). Similar to the SABM, iSABM marks bits with the help of channel reliabilities, i.e., using the absolute values of the log-likelihood ratios. The improvements offered by iSABM include: (i) HUBs being classified using a reliability threshold, (ii) BF randomly selecting HUBs, and (iii) soft-aided decoding over multiple SCC blocks. The decoding complexity of iSABM is comparable of that of SABM. This is due to the fact that on the one hand no sorting is required (lower complexity) because of the use of a threshold for HUBs, while on the other hand multiple SCC blocks use soft information (higher complexity). Additional gains of up to 0.53 dB with respect to SABM and 0.91 dB with respect to standard SCC decoding at a bit error rate of 10−6 are reported. Furthermore, it is shown that using 1-bit reliability marking, i.e., only having HRBs and HUBs, only causes a gain penalty of up to 0.25 dB with a significantly reduced memory requirement. © 2021, CC BY.

关键词： Stairs

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Companding techniques for SC-FDMA and sensor network applications

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International Journal of Electronics Letters 2020年第3期8卷 241-255页

作者： Abd El-Rahman, Amal F Ahmed, Rania A Abd Elnaby, Mustafa M. Khamis, Salah Napoleon, Sameh Abd-Elnaby, Mohammed Ahmed, Zeinab A El-Rabaie, El-Sayed M. Abd El-Samie, Fathi E. Electronics and Communications Department Faculty of Engineering Tanta University Tanta Egypt Training Evaluating and Updating Expert Systems Central Laboratory for Agricultural Expert System Giza Giza Egypt Department of Electronics and Electrical Communications Faculty of Electronic Engineering Menoufia University Menouf Egypt Department of Computer Engineering College of Computers and Information Technology Taif University Al-Hawiya Saudi Arabia

The large Peak-to-Average Power Ratio (PAPR) is a serious problem in wireless communication systems for mobile and sensor network applications. This paper presents efficient non-linear techniques to solve the large PAPR problem in Single-Carrier Frequency Division Multiple Access (SC-FDMA) system and Wireless Sensor Network (WSN) systems. The performance of the proposed techniques is investigated over a realistic channel model. Simulation results reveal PAPR reduction while preserving low Bit Error Rate (BER) levels. © 2019 Informa UK Limited, trading as Taylor & Francis Group.

关键词： companding DCT PAPR Power Amplifier SC-FDMA

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Guidance Control for parallel Parking Tasks

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IEEE/CAA Journal of Automatica Sinica 2020年第1期7卷 301-306页

作者： Jiyuan Tan Chunling Xu Li Li Fei-Yue Wang Dongpu Cao Lingxi Li Key Laboratory of Urban Intelligent Traffic Control Technology North China University of TechnologyBeijing 100144China Beijing Transport Institute Beijing 100073China Department of Automation BNRistTsinghua UniversityBeijing 100084China Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100080China Driver Cognition and Automated Driving Laboratory University of WaterlooWaterloo N2L 3G1Canada Department of Electrical and Computer Engineering Purdue School of Engineering and TechnologyIndiana University-Purdue University IndianapolisIndiana 46202-5132 USA

Parking into small berths remains difficult for unskilled drivers. Researchers had proposed different automatic parking systems to solve this problem. The first kind of strategies(called parking trajectory planning) designs a detailed reference trajectory that links the start and ending points of a special parking task and let the vehicle track this reference trajectory so as to park into the berth. The second kind of strategies(called guidance control) just characterizes several regimes of driving actions as well as the important switching points in certain rule style and let the vehicle follows the pre-selected series of actions so as to park into the berth. Parking guidance control is simpler than parking trajectory planning. However, no studies thoroughly validated parking guidance control before. In this paper, a new automatic parking method is presented, which could characterize the desired control actions directly. Then the feasibility is examined carefully. Tests show that a simple parking guidance control strategy can work in most parallel parking tasks, if the available parking berth is not too small. This finding helps to build more concise automatic parking systems that can efficiently guide human drivers.

关键词： Automatic parking guidance control trajectory planning

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A Character Recognition Method for Chip Surface Characters Based on Text Replacement

SSRN

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SSRN 2022年

关键词： Convolution

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