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IEEE Transactions on Industrial Cyber-Physical Systems 2023年 1卷 101-112页

作者： Gong, Xin Gong, Liqiang Huang, Tingwen Cui, Yukang School of Cyber Science and Engineering Southeast University Nanjing211189 China Research Institute Nanjing 6902 Technology Company Ltd. Nanjing210009 China College of Mechatronics and Control Engineering Shenzhen University Shenzhen518060 China Texas A&M University at Qatar Doha23874 Qatar Peng Cheng Laboratory Shenzhen518000 China

This article proposes a resilient path planning scheme for the formation flight of the Unmanned Aerial Vehicle (UAV) swarm against covert attacks. The proposed method optimizes the time and energy consumption while navigating the UAV swarm to achieve the planned formation configuration despite the covert attacks. In particular, each UAV is moving in a three-dimensional space and equipped with a GPS sensor and an Ultra-Wideband (UWB) sensor. The covert attacker can enlarge the formation error of the UAV swarm by simultaneously spoofing the readings of the GPS sensor and corrupting control inputs without being detected by the onboard UWB sensor. To analyze and defend the attacks, we first present the essential prerequisite for the existence of covert attacks. Based on the prerequisite, an optimal covert attack scheme can be derived to maximize the terminal formation error. Correspondingly, a time-critical defense strategy is put forward to depress the above covert attacker. This defense strategy can generate a dynamically feasible polynomial trajectory for each UAV with both security and time efficiency. The effectiveness and practicality of obtained theoretical results are illustrated via two simulation examples. © 2023 Institute of Electrical and Electronics Engineers. All rights reserved.

关键词： Motion planning

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Linear Convergence Analysis of Single-loop Algorithm for Bilevel Optimization via Small-gain Theorem

arXiv

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arXiv 2024年

作者： Li, Jianhui Pu, Shi Chen, Jianqi Wu, Junfeng College of Control Science and Engineering Zhejiang University China School of Data Science The Chinese University of Hong Kong Shenzhen China Nanjing University China

Bilevel optimization has gained considerable attention due to its broad applicability across various fields. While several studies have investigated the convergence rates in the strongly-convex-strongly-convex (SC-SC) setting, no prior work has proven that a single-loop algorithm can achieve linear convergence. This paper employs a small-gain theorem in robust control theory to demonstrate that a single-loop algorithm based on the implicit function theorem attains a linear convergence rate of O(ρk), where ρ ∈ (0, 1) is specified in Theorem 3. Specifically, We model the algorithm as a dynamical system by identifying its two interconnected components: the controller (the gradient or approximate gradient functions) and the plant (the update rule of variables). We prove that each component exhibits a bounded gain and that, with carefully designed step sizes, their cascade accommodates a product gain strictly less than one. Consequently, the overall algorithm can be proven to achieve a linear convergence rate, as guaranteed by the small-gain theorem. The gradient boundedness assumption adopted in the single-loop algorithm (Hong et al. (2023);Chen et al. (2022)) is replaced with a gradient Lipschitz assumption in Assumption 2.2. To the best of our knowledge, this work is first-known result on linear convergence for a single-loop algorithm. © 2024, CC BY.

关键词： Robust control

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Trust-Based Distributed Entropy Filtering for State-Saturated Nonlinear Systems with Hybrid Cyber-Attacks and Non-Gaussian Noises

Trust-Based Distributed Entropy Filtering for State-Saturate...

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control Conference (ANZCC), Australian and New Zealand

作者： Haifang Song Derui Ding Qing-Long Han Xiaohua Ge Department of Control Science and Engineering University of Shanghai for Science and Technology Shanghai P. R. China School of Science Computing and Engineering Technologies Swinburne University of Technology Melbourne Australia

This article proposes a novel trust-based entropy filter in distributed form for state-saturated nonlinear systems with hybrid cyber-attacks, including denial-of-service and deception attacks. A simple clustering method is employed to categorize the data received from neighboring nodes into two clusters: the trusted cluster and the untrusted cluster. By optimizing a joint cost function involving weighted least squares and a generalized maximum correntropy criterion, a two-step filter is designed in a distributed form, wherein the untrusted data from the neighbors is compensated to relieve the impact from malicious attacks. The significance of the designed algorithm is verified by conducting a target-tracking experiment at the end.

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Discrimination of the geographical origin of rice by Belousov-Zhabotinski oscillation fingerprint - Discrimination of the geographical origin of rice

Discrimination of the geographical origin of rice by Belouso...

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2021 IEEE International Conference on Electronic Technology, Communication and Information, ICETCI 2021

作者： Sha, Min Li, Liangcui Fang, Xueting Liu, Chang Gao, Yi School of Management Science and Engineering Nanjing University of Finance and Economics Nanjing China School of Control Science and Engineering Shandong University Jinan China

ISBN: (纸本)9781665432511

The origin traceability of geographical indication rice has always been highly concerned. From the perspective of non-equilibrium samples, this paper investigated the feasibility of electrochemical fingerprint produced by interaction between rice and Belousov-Zhabotinski (B-Z) oscillation system for identification of the geographical origin of rice firstly. Electrochemical fingerprints with abundant information and remarkable characteristics were achieved under the optimum conditions of blank oscillation reaction and reaction after introduction of rice. The recognition accuracy of the model established by support vector machine (SVM) reached 80%. The electrochemical fingerprints of non-equilibrium samples that measured by real-time tracking of the reaction process can not only reflect the difference of the composition and content of the sample, but also show the difference of chemical properties of the component, which provides a new idea for simple and accurate identification of food. ©2021 IEEE.

关键词： Support vector machines

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Mechanisms of allicin exposure for the sludge fermentation enhancement:Focusing on the fermentation processes and microbial metabolic traits

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Journal of Environmental sciences 2022年第5期34卷 253-264页

作者： Feng Wang Jingyang Luo Shiyu Fang Wenxuan Huang Yunqi Zhang Le Zhang Xiaoshi Cheng Wei Du Fang Fang Jiashun Cao Yang Wu Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of EducationHohai UniversityNanjing 210098China College of Environment Hohai UniversityNanjing 210098China State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China

As a frequently used product with antimicrobial activity,consumed allicin might be dis-charged and concentrated in waste-activated sludge(WAS).However,the influence of al-licin(as an exogenous pollutant)on WAS fermentation has not been clearly *** study aimed to disclose the impacts of allicin on volatile fatty acid(VFA)generation dur-ing WAS *** results showed that the appropriate presence of allicin(10 mg/g TSS)significantly enhanced the VFA yield(1894 versus 575 mg COD/L in the control)with increased acetate proportion(24.3%).Further exploration found that allicin promoted WAS solubilization,hydrolysis and acidification *** analysis revealed that the key genes involved in extracellular hydrolysis metabolism(i.e.,CAZymes),mem-brane transport(i.e.,gtsA and ytfT),substrate metabolism(i.e.,yhdR and pfkC)and fatty acid synthesis(i.e.,accA and accD)were all highly *** also induced the bacteria to produce more signalling molecules and regulate cellular functions,thereby enhancing the microbial adaptive and regulatory capacity to the unfavourable ***,the variations in fermentative microbes and their contributions to the upregulation of func-tional genes(i.e.,ytfR,gltL,INV,iolD and pflD)for VFA generation were ***,the simultaneous stimulation of functional microbial abundances and metabolic activities contributed to VFA production in allicin-conditioned reactors.

关键词： Allicin Waste activated sludge(WAS) Anaerobic fermentation Metagenomic analysis Functional genes

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Submarine groundwater discharge and associated nutrient fluxes in the Greater Bay Area, China revealed by radium and stable isotopes

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Geoscience Frontiers 2021年第5期12卷 397-410页

作者： Qianqian Wang Xuejing Wang Kai Xiao Yan Zhang Manhua Luo Chunmiao Zheng Hailong Li State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhenGuangdong 518055China School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution ControlSouthern University of Science and TechnologyShenzhenGuangdong 518055China MOE Key Laboratory of Groundwater Circulation&Environment Evolution and School of Water Resources and Environment China University of Geosciences(Beijing)Beijing 100083China

The estuary-bay system is a common and complex coastal ***,quantifying submarine groundwater discharge(SGD)and associated nutrient fluxes in the complex coastal environment is challenging due to more dynamic and complicated riverine discharge,ocean processes and human *** this study,SGD and SFGD(submarine fresh groundwater discharge)fluxes were evaluated by combining stable and radium isotopes in the Guangdong-Hong Kong-Macao Greater Bay Area(GBA),a typical estuary-bay *** first built a spatially distributed radium mass balance model to quantify SGD fluxes in coastal areas of GBA integrating the Pearl River Estuary(PRE),bays and *** then used the stable water isotope(d2 H and d18O)end-member mixing model to distinguish submarine fresh groundwater discharge(SFGD)from *** on the 228Ra mass balance,the estimated SGD fluxes in the PRE,adjacent bay,and shelf areas were(6.14±2.74)×10^(8) m^(3) d^(-1),(3.00±1.11)×10^(7) m^(3) d^(-1),and(5.00±5.64)×10^(8) m^(3) d^(-1),*** showed that the largest area-averaged SGD was in the PRE,followed by that in the adjacent shelf and the *** differences may be mainly influenced by ocean forces,urbanization and benthic topographies controlling the variability of groundwater ***,the three end-member mixing model of ^(228)Ra and salinity was developed to confirm the validity of the estimated SGD using the Ra mass balance *** the two models,groundwater endmember and water apparent age estimation were the main sources of uncertainty in *** estimated SFGD flux was(1.39±0.76)108 m^(3) d^(-1),which accounted for approximately 12%of the total *** stable and radium isotopes was a useful method to estimate groundwater ***,the estimated SGD associated dissolved inorganic nitrogen(DIN)flux was one order of magnitude higher than other DIN *** was considered to be a significant contributor to the DIN loading to the *** findings

关键词： Radium isotopes Stable isotopes Submarine fresh groundwater discharge Nutrients Coastal aquifers Pearl River estuary

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Negative longitudinal piezoelectricity in epitaxial perovskite ferroelectric films

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Physical Review B 2025年第6期111卷 064104-064104页

作者： Gang Bai Yuhang Chen Guoliang Yuan Cunfa Gao College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications Nanjing 210026 China School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

In this paper, we investigate the underlying mechanisms of the universal and intrinsic negative piezoelectricity in perovskite thin film ferroelectrics by using our developed thermodynamic theory of single domain (310) oriented films. Perovskite ferroelectric Pb(Zr1–xTix)O3 (PZT) is analyzed in detail as a typical example, but the theory can be applied to any other perovskite piezoelectrics. Consistent with recent experimental work [O. Paull et al., Nat. Mater. 21, 74 (2022)], our theory also indicates that there exists a strong coupling between P2 (along the [1–30] direction) and P3 (along the [310] direction) allowed by the 2/m point group symmetry of the paraelectric state. From the calculated composition–misfit strain and misfit strain–misfit strain phase diagrams of Pb(Zr1–xTix)O3, it can be seen that isomorphic transitions of 1 symmetry between three triclinic states (a1a2c, a1c, and a1a2) take place near morphotropic phase boundary composition and under both isotropic tensile strain and anisotropic tensile strain. The negative piezoelectric coefficient d33 appears in the quasi-a1a2 phase under tensile strain, which stems from the very approximate energies between a1a2c and a1a2 under tensile strain due to the strong coupling between P2 and P3 caused by symmetry breaking. Moreover, this coupling leads to negative partial differentiation of longitudinal strain on longitudinal polarization in the quasi-a1a2 phase, which also gives rise to negative d33. We also demonstrate the longitudinal negative piezoelectricity in (210) and (410) PZT thin films. The results are consistent with those of (310) films due to their same symmetry. This paper will deepen understanding about the anomalous negative piezoelectricity of perovskite ferroelectric materials, and provide strategies for discovering materials with novel electromechanical properties.

关键词： Tensile strain

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Bioaerosol emissions variations in large-scale landfill region and their health risk impacts

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Frontiers of Environmental science & engineering 2022年第12期16卷 101-109页

作者： Yanfeng Yang Ruina Zhang Ziyang Lou College of Environmental and Chemical Engineering Shanghai University of Electric PowerShanghai200090China Shanghai Environmental Sanitation Engineering Design Institute Co. Ltd.Shanghai200323China Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery School of Environmental Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092China

Landfills are widely complained about due to the long-term odor and landfill gas emissions for local residents,while the bioaerosols are always neglected as another threat to on-site *** this study,bioaerosols samples were collected from the typical operation scenes in the large-scale modern landfill,and the emission levels of airborne bacteria,pathogenic species,and fungi were quantified and *** corresponding exposure risks were assessed based on the average daily dose via inhalation and skin *** was found that the levels of culturable bacteria and fungi in all landfill samples were around 33–22778 CFU/m3 and 8–450 CFU/m3,and the active-working landfill area and the covered area were the maximum and minimum emission sources,respectively,meaning that the bioaerosols were mainly released from the areas related with the fresh waste *** sp.,Massilia sp.,Methylobacterium-Methylorubrum *** Noviherbaspirillum *** the main bacterial populations,with a percentage of 42.56%,89.82%,70.24%and 30.20%respectively in total bioaerosols *** regards to the health risk,the health risks via inhalation were the main potential risks,with four orders of magnitude higher than that of skin ***-working area showed the critical point for non-carcinogenic risks,with a hazard quotient of 1.68,where 80 m protection distance is recommended for on-site worker protection,plus more careful protection measures.

关键词： Microbial aerosols Landfill sites Health risk assessment CALPUFF

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A Detection Algorithm Based on Improved Faster R-CNN for Spacecraft Components

A Detection Algorithm Based on Improved Faster R-CNN for Spa...

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Image Processing and Computer Applications (ICIPCA), IEEE International Conference on

作者： Zongqi Wang Yue Cao Jun Li School of Control Science and Engineering Shandong University Jinan China School of Electronic Information and Electronic Engineering Shanghai Jiaotong University Jinan

Due to the increasing need of science and technology, more and more spacecraft are in space. Once the spacecraft reaches its useful life, it will become floating junk in space. Active space debris removal technology is an effective method to solve space garbage. With the rapid iteration of deep learning methods, target detection technology in the field of computer vision has made a breakthrough. In this paper, a Faster R-CNN model based on RegNet as the main trunk network is proposed, which can reduce the loss of key information caused by R-CNN sampling and effectively improve the target detection effect. We will collect the photos of space spacecraft as training sets and verification sets sent to the network for iterative training. The test results of the data set in this paper show that: With RegNet as the main backbone network, the Faster R-CNN model has better test results than other target detection algorithms under the same parameters. Compared with other backbone networks added to Faster R-CNN, the mAP value is improved by at least 9.6%. Compared with other advanced target detection algorithms, mAP value increased by at least 26.3%. When processing low Earth orbit target identification tasks, the Faster R-CNN model based on RegNet as the main trunk network has a strong recognition ability for the image targets whose color is similar to the background color, relatively fuzzy and small scale.

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Semi-Tensor Product Based control of Discrete-Time Switched Systems

Semi-Tensor Product Based Control of Discrete-Time Switched ...

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Qilong Sun Rongni Yang Peng Shi School of Control Science and Engineering Shandong University Jinan Shandong China School of Electrical and Electronic Engineering The University of Adelaide Adelaide Australia

This paper studies the modelling and control problem of discrete-time switched systems via the semi-tensor product (STP) of matrices. First of all, with the aid of logic dynamical generator constructed for the switching signal, a new model that combines the logical dynamics and discrete-time switched systems with the state feedback controller is established. Next, necessary and sufficient conditions are proposed for the resultant closed-loop systems based on STP. Finally, an example is given to demonstrate the effectiveness of the proposed result.

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