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1,249 results on '"Wang, Jianfei"'

3. Series Fault Arc Detection Based on VMD and Entropy Squared Euclidean Distance

Author

Wang, Jianfei, Sun, Yifan, Ge, Shiwei, Jv, Guanbo, Xie, Zhenhua, Qi, Dongqian, Guo, Fengyi, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, Yang, Qingxin, editor, and Li, Jian, editor

Published
2025
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7. On the Local Regularity of the Hilbert Transform

Author

Pan, Yifei, Wang, Jianfei, and Yan, Yu

Subjects
Mathematics - Classical Analysis and ODEs, Mathematics - Complex Variables
Abstract

In this paper the local regularity of the Hilbert transform is considered, and local smoothness and real analyticity results are obtained.

Published
2023

11. A novel dual-port three-level converter

Author

WANG Guifeng, YUAN Xin, JIANG Yunhui, WANG Jianfei, and LIN Zhifang

Subjects
converter, dual-port, level-shifting pulse width modulation, dc offsets, modulation regime, power quality, Applications of electric power, TK4001-4102
Abstract

Aiming to address the problems of high cost, large size and complex structure of the traditional back-to-back three-level converter, this paper proposes a new dual-port three-level converter topology. This new topology reduces the number of switching devices and optimizes the system size through device multiplexing. Firstly, the operating principle of the proposed converter topology is analyzed in detail, outlining the six effective switching states, current flow paths, and corresponding dual-port output levels of the single leg, while also discussing and the voltage stresses of each switching device. Secondly, a level-shifting pulse width modulation for the proposed converter topology is investigated and designed, and the effect of modulating wave overlap is avoided by adding DC offsets. Thirdly, the key problems of the modulation scheme under both the common frequency and different frequency operation modes, such as the modulation regime range and phase angle difference constraints are analyzed. The principles for selecting DC offsets and constraint range of two-port modulation system in each operating mode are introduced. Finally, the different operating modes are verified using the DSP-FPGA-Typhoon HIL 402 experimental platform. The experimental results show that level-shifting pulse width modulation with DC offsets makes the output power quality of the converter better and the harmonic content lower on the premise of achieving stable output of voltage and current for the proposed converter topology.

Published
2024
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38. Relativistic Kelvin circulation theorem for ideal Magnetohydrodynamics

Author

Wang, Jianfei and Pu, Shi

Subjects
Nuclear Theory, High Energy Physics - Phenomenology
Abstract

We have studied the relativistic Kelvin circulation theorem for ideal Magnetohydrodynamics. The relativistic Kelvin circulation theorem is a conservation equation for the called $T$-vorticity. We have briefly reviewed the ideal magnetohydrodynamics in relativistic heavy ion collisions. The highlight of this work is that we have obtained the general expression of relativistic Kelvin circulation theorem for ideal Magnetohydrodynamics. We have also applied the analytic solutions of ideal magnetohydrodynamics in Bjorken flow to check our results. Our main results can also be implemented to relativistic magnetohydrodynamics in relativistic heavy ion collisions., Comment: Proceedings for CNPC 2019, accepted by NPR

Published
2020
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43. Research on Vehicle Traffic Monitoring Technology in Traffic Big Data Environment

Author

Li Zhiming, Yang Jian, Liang Jigui, and Wang Jianfei

Subjects
improved yolov4, deep sort, multi-scale feature fusion, clahe algorithm., 68t05, Mathematics, QA1-939
Abstract

Intelligent traffic flow analysis, as an emerging technology, provides effective solutions for urban traffic management through big data analysis and artificial intelligence algorithms. The Yolov4 algorithm is used to incorporate the Deep SORT multi-target tracking algorithm and multi-scale feature fusion detection model in this study. In addition, the improved Yolov4 algorithm model with multi-scale feature fusion based on the tracking algorithm is formed by combining the CLAHE algorithm in the input module of the original Yolov4 algorithm and by replacing the backbone network and optimising the neck network. The model presented in this paper has a better training effect on the vehicle flow evaluation index. The tracking algorithm employed in this paper is now 0.268 more accurate than the KCF algorithm, and it takes only 5.65ms to process the video images. In addition, the mAP, Rank-1, and Rank-5 of this paper’s model for monitoring small vehicles are 82.81%, 86.79%, and 95.43% respectively, which are better than the base model. The improved Yolov4 traffic monitoring algorithm proposed in this paper balances counting accuracy and running speed, and has superior vehicle traffic monitoring performance than the comparison algorithm.

Published
2024
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