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Analysis of Moving Target Defense in Unbalanced and Multiphase Distribution Systems Considering Voltage Stability

Analysis of Moving Target Defense in Unbalanced and Multipha...

2021 IEEE International Conference on Communications, control, and Computing Technologies for Smart Grids, SmartGridComm 2021

作者： Liu, Mengxiang Zhao, Chengcheng Zhang, Zhenyong Deng, Ruilong Cheng, Peng College of Control Science and Engineering Zhejiang University State Key Lab. of Industrial Control Technology Hangzhou China College of Computer Science and Technology Guizhou University State Key Lab. of Public Big Data Guiyang China

ISBN: (纸本)9781665415026

Moving Target Defense (MTD) is a new technology to defend against the false data injection attack (FDIA) on distribution system state estimation (DSSE). It works by proactively perturbing the branch reactance. However, due to the challenges induced by the nonlinear dynamics and the coupling phases in the three-phase AC DSSE model, the analysis on the effectiveness and hiddenness of MTD, which are two essential performance metrics, has not yet been conducted. In this paper, we attempt to optimize the effectiveness and hiddenness of MTD while considering voltage stability. Firstly, we quantify the two metrics with approximated measurement residuals. Based on the quantified metrics, we formulate an optimization problem to maximize the effectiveness with guaranteed hiddenness and ensure voltage stability by minimizing the voltage variation induced by MTD. The original problem is transformed to a polynomial optimization problem based on the observation that the alteration of the projection matrix caused by reactance perturbation is neglectable, such that the near-optimal result can be obtained. Finally, extensive simulations are conducted on the IEEE 13-bus test feeder to evaluate the performance of the proposed MTD. © 2021 IEEE.

关键词： Network security

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Reconstructing Three-Degree-of-Freedom Pose through Temporal Phase-Shifted Low-Coherence Spatial Interferograms 16

Reconstructing Three-Degree-of-Freedom Pose through Temporal...

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16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024

作者： Shi, Liheng Zhang, Jinxu Gu, Yingying Gai, Fangqin Liu, Jing Wu, Guanhao Tsinghua University State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Beijing100084 China Yangtze Delta Region Institute of Tsinghua University Zhejiang Research Center of Opto-electronic Sensing Zhejiang 314006 China Beijing Institute of Control Engineering Space Optoelectronic Measurement and Perception Lab. Beijing100190 China China Academy of Space Technology National Key Laboratory of Space Intelligent Control Beijing100094 China

We introduce a method for measuring three degrees of freedom using low-coherence light and temporal phase-shifting to discern position and orientation from the coherence envelope shape, enabling direct measurement wit... 详细信息

ISBN: (纸本)9798350372076

关键词： Degrees of freedom (mechanics)

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SSIGAN: Semantic Segmentation via Improved Generative Adversarial Network 14

SSIGAN: Semantic Segmentation via Improved Generative Advers...

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14th International Conference on Signal Processing Systems, ICSPS 2022

作者： Lu, Mengxu Chen, Zhenxue Qin, Hao Zhang, Yujiao Ji, Jingjing School of Control Science and Engineering Shandong University Jinan China Huazhong University of Science and Technology The State Key Lab. of Dig. Manuf. and Equip. Tech. Hube China

ISBN: (纸本)9798350336313

Nowadays, although conditional convolutional neural networks have applied to semantic segmentation, their loss function needs to be carefully designed. We propose an improved generative adversarial network including a generator network and a discriminator network for semantic segmentation. In some blocks, we substitute 3×1 and 1×3 factorized convolution for 3×3 convolution to make full use of transverse and longitudinal information. We concat the original image with the output of the generator as the input of the discriminator network to improve the discriminant ability. As a result, our model achieves 69.6% mean intersection over union (mIoU) on the Cityscapes test set. Our experiments exhibit that adversarial training approach leads to improved accuracy on the Cityscapes, Camvid, Kitti and Gatech dataset in road scene. © 2022 IEEE.

关键词： Semantic Segmentation

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Computer vision-based evaluation of dimensional accuracy for MEAM in new product development 33

Computer vision-based evaluation of dimensional accuracy for...

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33rd CIRP Design Conference

作者： Tu, Yongqiang Gong, Huiyun Hassan, Alaa Siadat, Ali Chen, Zhangwei Additive Manufacturing Institute College of Mechatronics and Control Engineering Shenzhen University Shenzhen518060 China The State Key Lab of Software Development Environment Beihang University Beijing100191 China ERPI Université de Lorraine NancyF-54000 France LCFC Arts et Métiers ParisTech MetzF-57000 France

Evaluation of dimensional accuracy for parts is a key component of quality assurance for material extrusion based additive manufacturing (MEAM) in new product development. Computer vision-based frameworks are currently the most suitable methods for MEAM dimensional accuracy evaluation due to their non-contact measurement characteristic, rapidity and high accuracy. However, the previous computer vision-based frameworks in MEAM had the limitations of high camera cost and strict installation requirements. To address this issue, a cheap and accurate computer vision-based framework is proposed for MEAM based on a single mobile phone camera without strict installation requirements. First, camera is calibrated to reduce the influence of lens distortion. Then, dimensions are measured through projective transformation and scaling. To find the best calibration pattern, three calibration pattern named checkerboard, symmetric circle and asymmetric circle are investigated. The proposed framework is validated experimentally through printing tests of a cube and a cylinder fabricated by a fused deposition modeling (FDM) 3D printer. The result shows that camera calibration using asymmetric circular grid pattern has the highest accuracy and the proposed computer vision framework is validated as the maximum relative error is less than 1%. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0)

关键词： Computer vision

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Directional Beamforming for High-Speed Railway Communications with Frequency Offset Precorrection

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Chinese Journal of Electronics 2025年第1期23卷 163-168页

作者： Yuan Cao Yinghong Wen Wei Xu Xin Xie School of Electronics and Information Engineering Beijing Jiaotong University National Engineering Research Center of Rail Transportation Operation and Control System Beijing China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing China National Mobile Communications Research Lab. Southeast University Nanjing China

This paper considers a multi-antenna transmission strategy for high speed railway communications. In order to achieve better performance than conventional space-frequency block coding schemes, we propose a directional beamforming strategy for the High-speed railway (HSR) communication by exploiting some characteristic of the railway system including predetermined moving tracks and real-time positioning information. Moreover, for alleviating the effect of Doppler shift due to the moving train, a frequency offset precorrection method is also incorporated with direction beamforming. Theoretical Signal-to-noise ratio (SNR) gain of the proposed beamforming scheme over traditional HSR communication schemes is also derived for illustrating the performance enhancement. Numerical results verify the effectiveness of our proposed scheme even with some kind of imperfect position information availab.e at the transmitter.

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A Novel Cutting Method for Face-Hobbed Spiral Bevel Gears Based on Tool Path Modification

A Novel Cutting Method for Face-Hobbed Spiral Bevel Gears Ba...

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2021 International Conference on Advanced Technologies and Applications of Modern Industry, ATAMI 2021

作者： Li, Lingzhi Guo, Wenchao Yang, Huawei Mao, Shimin State Key Lab. of Comprehensive Technology on Automobile Vibration and Noise and Safety Control No.1 Xinhongqi Street Changchun130013 China School of Mechanical Engineering Xi'An Jiaotong University Xianning West Road 28 Xi'an710049 China

A novel tooth surface design method of face-hobbed spiral bevel gears is proposed, which utilizes a solid cutter without axis tilting through tool path control combining with optimized cutter blade profile to control tooth contact patterns and realize tooth lengthwise chamfering. Firstly, a gear tooth surface generating plan of tool path controlling actively is developed, the mathematical model of the tool path is built, and the equations are given in detail, the determination method of all control parameters is also described. Next, the tooth surface functions of generating gear and machined gear are established based on a mathematic model of the traditional cradle machine tool. Then, the machine setting is also given in concise equations. Finally, the tooth contact analysis is also conducted for a specific gear pair to validate the validity and the reasonability of the new tooth modification method. © Published under licence by IOP Publishing Ltd.

关键词： Machine tools

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One-Shot Three-Dimensional Measurement Based on Spectral Interferometry Using a Digital Micromirror Device

One-Shot Three-Dimensional Measurement Based on Spectral Int...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Jinxu Zhang Liheng Shi Yingying Gu Donglai Zhang Lu Yin Guanhao Wu Department of Precision Instrument State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing China Space Optoelectronic Measurement and Perception Lab. Beijing Institute of Control Engineering Beijing China National Key Laboratory of Space Intelligent Control China Academy of Space Technology Beijing China

We present a one-shot 3D spectral interferometry technique using a digital micromirror device. By encoding the distribution of the spatial light field, this approach enables 3D imaging of step structures within 27 ms.

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Optical interferometry Three-dimensional displays Imaging Surface emitting lasers Measurement by laser beam Encoding Microcavities

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A 4-Channel Ultrafast Wavelength-Swept REC-DFB Laser Array for Fiber Bragg Grating Interrogation

A 4-Channel Ultrafast Wavelength-Swept REC-DFB Laser Array f...

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2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Meng, Lingxin Dai, Pan Ban, Qilu Xu, Kaichuan Wang, Jiacheng Li, Zhen Wang, Feng Zeng, Jie Li, Shaobo Ma, Xiang Chen, Xiangfei Res. Center of Precision Photonics Integration and System Application of the Ministry of Education College of Engineering and Applied Sciences Nanjing University Key Lab. of Intelligent Optical Sensing and Manipulation of the Ministry of Education Engineering National Laboratory of Solid State Microstructures Nanjing210023 China Nanjing University of Aeronautics and Astronautics State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing210016 China The 54th Research Institute of China Electronics Technology Group Corporation Optical Communication Research and Development Center Shijiazhuang050081 China

ISBN: (纸本)9798350312614

We present a four-channel ultrafast wavelength-swept distributed feedback (DFB) semiconductor laser array based on the reconstruction-equivalent-chirp (REC) technique using instantaneous injection current modulation. With the aid of our designed laser driving circuit system consists of the microcontroller unit (MCU), field-programmable gate array (FPGA) and negative metal-oxide-semiconductor field effect transistors (n-MOSFETs), the precise pulse driving current for the 4-channel wavelength-swept REC-DFB laser array can be generated and a fast tuning of 16.424 nm within 10 μs is achieved. To further investigate the tuning performance of the proposed wavelength-swept laser source, we then applied it to the fiber Bragg grating (FBG) interrogation system and four FBG temperature sensor arrays were successfully demodulated. The development of high-efficient optical sensing systems heavily relies on the significance of the ultrafast wavelength-swept laser source, which has the potential to greatly enhance FBG interrogator performance in the future. © 2023 IEEE.

关键词： DFB laser array fast wavelength-swept fiber Bragg grating interrogation REC technique

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Design, Analysis and Testing of an Inerter-Based Passive Sky-Hook Damper

SSRN

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SSRN 2023年

作者： Pu, Huayan Sun, Zhi Yuan, Shujin Li, Xueping Bai, Ruqing Yi, Jin Jinglei, Zhao Luo, Jun The State Key Lab. of Mechanical Transmission Chongqing University No.174 Shazheng Road Chongqing400044 China School of Mechatronics Engineering and Automation Shanghai University No.99 Shangda Road Shanghai200444 China

The benefit of the sky-hook damper has been intentionally introduced to reduce the resonance peak while maintaining good performance in the high frequency zone. However, few results have been reported on passive methods to realize the sky-hook damper effect. In this paper, a new design for an inerter-based passive sky-hook damper(IPSD) is proposed, based on a magnetic lead screw(MLS) mechanism. The device is equipped with a magnetic inerter and can provide a changing inerterance for different frequency excitations by an MLS with flywheel. The MLS consists of two helical permanent magnets, and the force that it provides should be modeled as a sinusoidal function. Theoretical analysis was performed and simulated by the MATlab.software. The performance shows that by changing the parameters of the IPSD, it can realize a similar function to a active sky-hook damper. Then, the parameters of IPSD were analyzed to obtain the effects of the flywheel moment inertia, rotational friction, and helical permanent magnet pitch on the dynamic response of the system. Finally, a prototype was designed and fabricated, and static and dynamic experiments were performed. The results show that, the IPSD can reduce 69% of the peak value of the transmissibility, while maintain a 40dB/dec decline speed in high frequency zone. © 2023, The Authors. All rights reserved.

关键词： Screws

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A Stochastic Resource Management Scheme for Multi-Energy Group control System

A Stochastic Resource Management Scheme for Multi-Energy Gro...

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Power Electronics, Computer Applications (ICPECA), IEEE International Conference on

作者： Ran Ding Rongfu Sun Yan Geng Yiming Yao Ergang Zhao Lina Xu State Grid Jibei Electric Power Company Limited Beijing China Dept. of Electrical Engineering State Key Lab. of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

The interaction between various energy supply systems (cold, heat, electricity, gas, etc.) is becoming more tightly coupled as social economy and technology advance. Multi-energy systems are ineffective because different types of energy systems run independently. In order to protect the data privacy of each sub-system, this research suggests an ideal resource management framework for a multi-energy group control system. The energy hub (EH) paradigm is first suggested. When deploying EHs, the physical constraints of various energy systems are taken into account. Through scenario-based stochastic programming, the uncertainties of renewable energy are considered. According to the leader-follower relationship between multi-energy group control system operators and energy hub operators (EHOs), Benders decomposition is applied to decentralize the decision-making process. Finally, an example is given to illustrate the effectiveness of the proposed model and algorithm.

关键词： Data privacy Renewable energy sources Uncertainty Decision making Stochastic processes Process control Programming

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