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arXiv 2024年

作者： Zhang, Dandan Jin, Xin Su, Hongye The State Key Laboratory of Industrial Control Technology The Institute of Cyber-Systems and Control The College of Control Science and Engineering Zhejiang University Hangzhou310027 China The Research Institute of Intelligent Complex Systems Fudan University Shanghai200433 China The Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of Education East China University of Science and Technology Shanghai200237 China

By designing the decentralized time-regularized (Zeno-free) event-triggered strategies for the state-feedback control law, this paper considers the stochastic stabilization of a class of networked control systems, where two sources of randomness exist in multiple decentralized networks that operate asynchronously and independently: the communication channels are constrained by the stochastic network delays and also by Poisson pulsing denial-of-service (Pp-DoS) attacks. The time delay in the network denotes the length from a transmission instant to the corresponding update instant, and is supposed to be a continuous random variable subject to certain continuous probability distribution;while the attacks' cardinal number is a discrete random variable supposed to be subject to Poisson distribution, so the inter-attack time, i.e., the time between two consecutive attack instants, is subject to exponential distribution. The considered system is modeled as a stochastic hybrid formalism, where the randomness enters through the jump map into the reset value (the inter-attack time directly related) of each triggered strategy. By only sampling/transmitting state measurements when needed and simultaneously by taking the specific medium access protocols into account, the designed event-triggered strategies are synthesized in a state-based and decentralized form, which are robust (tolerable well) to stochastic network delays, under different tradeoff-conditions between the minimum inter-event times, maximum allowable delays (i.e., potentially tolerable delays) and the frequencies of attacks. Using stochastic hybrid tools to combine attack-active parts with attack-over parts, the designed triggered strategies, if designed well according to the actual system needs, can tolerate (be resilient to) the Pp-DoS attacks and stochastic network delays without jeopardizing the stability and Zeno-freeness, which is verified by the robust global attitude stabilization of flexible combined ro

关键词： Networked control systems

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Vapor phase epitaxy of PbS single-crystal films on water-soluble substrates and application to photodetectors

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Nano Research 2022年第6期15卷 5402-5409页

作者： Yifan Wang Jing Xia Xuanze Li Fan Ru Xue Chen Ze Hua Ruiwen Shao Xuecong Wang Wenjun Zhang Chun-Sing Lee Xiangmin Meng Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Institute of Process Engineering Chinese Academy of SciencesBeijing 100190China Centre of Material Science and Optoelectronic Engineering University of Chinese Academy of SciencesBeijing 10049China Engineering Research Center for Semiconductor Integrated Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Analysis&Testing Center Beijing Institute of TechnologyBeijing 102488China Beijing Advanced Innovation Center for Intelligent Robots and Systems and Institute of Convergence in Medicine and Engineering Beijing Institute of TechnologyBeijing 100081China Center of Super-Diamond and Advanced Films(COSADF)and Department of Materials Science and Engineering City University of Hong KongHong KongChina Center of Super-Diamond and Advanced Films(COSDAF)and Department of Chemistry City University of Hong KongHong KongChina

Lead sulfide(PbS),a typical functional semiconductor material,has attracted serious attention due to its great potential in optoelectronics ***,controllable growth of PbS single-crystal film still remains a great ***,we report heteroepitaxial growth of large-scale highly crystalline PbS films on alkali salt(NaCl and KCl)substrates via chemical vapor deposition(CVD).Structural characterizations demonstrate that the as-grown PbS films exhibit an atomically sharp interface with the underlying *** epitaxial relationships between the epilayers and substrates were determined to be PbS(100)//NaCl(100)or KCl(100),PbS[010]//NaCl[010]or KCl[010].Owing to the high solubility of alkali salt,the epitaxial PbS films can be rapidly released from the underlying substrates and transferred to other substrates of interest while maintaining good integrity and crystallinity,the process of which is particularly attractive in the fields of electronics and ***,photodetectors based on the transferred PbS films were fabricated,exhibiting a high photoresponsivity of 7.5 A/W,a detectivity of 1.44×10^(12)Jones,and a rapid response time of approximately 0.25 *** work sheds light on the batch production,green transfer,and optoelectronic application of PbS films.

关键词： heteroepitaxial growth lead sulfide(PbS) single-crystal film photodetector transferable

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Adaptive Pseudo Inverse Control for a Class of Nonlinear Asymmetric and Saturated Nonlinear Hysteretic systems

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IEEE/CAA Journal of Automatica Sinica 2021年第4期8卷 916-928页

作者： Xiuyu Zhang Ruijing Jing Zhiwei Li Zhi Li Xinkai Chen Chun-Yi Su School of Automation Engineering Northeast Electric Power Universityand also with Jilin Province International Research Center of Precision Drive and Intelligent ControlJilin 132012China State Key Laboratory of Synthetical Automation for Process Industries Northeastern UniversityShenyang 110819China Department of Electronic and Information Systems Shibaura Institute of TechnologySaitama 337-8570Japan Department of Mechanical and Industrial Engineering Concordia UniversityQCMontreal H3B 1R6Canada

This paper aims at eliminating the asymmetric and saturated hysteresis nonlinearities by designing hysteresis pseudo inverse compensator and robust adaptive dynamic surface control(DSC)***"pseudo inverse"means that an on-line calculation mechanism of approximate control signal is developed by applying a searching method to the designed temporary control signal where the true control signal is *** main contributions are summarized as:1)to our best knowledge,it is the first time to compensate the asymmetric and saturated hysteresis by using hysteresis pseudo inverse compensator because the construction of the true saturated-type hysteresis inverse model is very difficult;2)by designing the saturated-type hysteresis pseudo inverse compensator,the construction of true explicit hysteresis inverse and the identifications of its corresponding unknown parameters are not required when dealing with the saturated-type hysteresis;3)by combining DSC technique with the tracking error transformed function,the"explosion of complexity"problem in backstepping method is overcome and the prespecified tracking performance is *** of stability and experimental results on the hardware-inloop platform illustrate the effectiveness of the proposed adaptive pseudo inverse control scheme.

关键词： Adaptive dynamic surface control adaptive pseudo inverse control asymmetric and saturated hysteresis robust control

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Quantized Distributed Nonconvex Optimization Algorithms with Linear Convergence under the Polyak–Lojasiewicz Condition

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IEEE Transactions on Automatic Control 2025年

作者： Xu, Lei Yi, Xinlei Sun, Jiayue Shi, Yang Johansson, Karl H. Yang, Tao Northeastern University State Key Laboratory of Synthetical Automation for Process Industries Shenyang110819 China University of Victoria Department of Mechanical Engineering VictoriaBCV8W 2Y2 Canada Tongji University Shanghai Institute of Intelligent Science and Technology Shanghai201804 China KTH Royal Institute of Technology Division of Decision and Control Systems School of Electrical Engineering and Computer Science Stockholm100 44 Sweden

This paper considers distributed optimization for minimizing the average of local nonconvex cost functions, by using local information exchange over undirected communication networks. To reduce the required communication capacity, we introduce an encoder–decoder scheme. By integrating it with distributed gradient tracking and proportional integral algorithms, respectively, we then propose two quantized distributed nonconvex optimization algorithms. Assuming the global cost function satisfies the Polyak–Lojasiewicz condition, which does not require the global cost function to be convex and the global minimizer is not necessarily unique, we show that our proposed algorithms linearly converge to a global optimal point. Moreover, we show that a low data rate is sufficient to guarantee linear convergence when the algorithm parameters are properly chosen. The theoretical results are illustrated by numerical examples. © 1963-2012 IEEE.

关键词： Cost functions

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Comparison of Turbulence Approaches Modelling the Flow Around the NACA 0012 Profile

Comparison of Turbulence Approaches Modelling the Flow Aroun...

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Innovative Research in Applied Science, engineering and Technology (IRASET),Conference on

作者： Soufinae Elouardi Bouchaib Radi Rabii El Maani Laidi Zahiri Laboratory of Modeling and Simulation of intelligent industrial systems (MS2IS) Hassan II University of Casablanca Higher Normal School of Technical Education Mohammedia Morocco Laboratory of Engineering Industrial Management and Innovation (IMII) FST Settat Hassan 1st University Settat Morocco Laboratory of Computer and Mathematical Process Engineering ENSA Khouribga Sultan Moulay Slimane University Khouribga Morocco

Turbulence refers to the instability of air movements in which the speed has a whirling character at all points. This is a phenomenon often observed and generates sometimes violent movements that can disrupt flight in the case of aerodynamic interactions with aircraft. Bodily accidents due to turbulence are numerous, but they can be avoided with good control and prediction of the fluid behavior around this structure. In order to do this, designers are increasingly using numerical modeling to boost these aircraft's efficiency. We carried out a numerical analysis of the two-dimensional transonic flow on a NACA 0012 airfoil using the ANSYS/FLUENT software in order to compare the capacity of different turbulence models to predict results that are similar to those of experimental studies. The results were compared to the provided experimental data in the high Reynolds Number range of 9.10 6 . Then, a comparison based on the RANS, LES and Hybrid approach in order to obtain a better control of the profile performance. We demonstrated that Spalart-Allmaras model of Dettached Eddy Simulation gave good results for unsteady flow over the wing.

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Meshless approach based on MLS with additional constraints for large deformation analysis

Meshless approach based on MLS with additional constraints f...

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2020 International Conference on Mathematics and Data Science, ICMDS 2020

作者： El Kadmiri, R. Belaasilia, Y. Timesli, A. Kadiri, M.S. Laboratory of Process Engineering Computer Science and Mathematics Bd Beni Amir BP 77 Khouribga Morocco Laboratory of Structural Engineering Intelligent Systems and Electrical Energy 150 Avenue Nile Sidi Othman Casablanca20670 Morocco Hassan II University of Casablanca Faculty of Sciences of Ben m'Sik LIMAT Laboratory B. P 7955 Sidi Othman Casablanca Morocco

In the present work, we are interested to develop a meshless approach, based on the strong form MLS approximation with additional constraints, to solve the nonlinear elastic and elsto-plastic problems for regular and irregular distribution of points. We adopt a plastic behavior law based on the total deformation theory, which is very convenient when the physical nonlinearity is more important than the effect of irreversible process and the loading history. In plasticity, one encounters discontinuities of rigidity where the application of asymptotic developments seems difficult or impossible. To apply the Taylor series expansion, regularization methods have been adapted. The strong form MLS approximation allows us to avoid the inconvenient of the numerical integration, while the asymptotic developments help us to reduce the computation cost observed in the incremental law of plasticity and the iterative methods. For irregular points distribution, we can get an ill-posed least squares problems due to a singular moment matrix of MLS approximation. To avoid this difficulty, we propose a modified MLS approximation by introducing additional constraints which allows to increase the error functional used in the derivation of the shape functions. © Published under licence by IOP Publishing Ltd.

关键词： Plasticity

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A coupled Meshless-FEM method based on strong form of Radial Point Interpolation Method (RPIM)

A coupled Meshless-FEM method based on strong form of Radial...

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2020 International Conference on Mathematics and Data Science, ICMDS 2020

In this present work, we are implementing a novel hybrid method based on the coupling of RPIM in strong form and Finite Element Method (FEM). The basic idea is to ensure the coupling between the two methods through the collocation technique based on RPIM interpolation. This technique is used to evaluate the local equations of the problem at the interface between FEM and RPIM regions. We can avoid numerical integrations of a big part of nodes using the strong form of RPIM. Numerical studies show that this method gives reasonably accurate results consistent with the theory. © Published under licence by IOP Publishing Ltd.

关键词： Finite element method

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Agent-based maintenance decision support system for power grids operating in electricity markets 30th

Agent-based maintenance decision support system for power gr...

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30th European Safety and Reliability Conference, ESREL 2020 and 15th Probabilistic Safety Assessment and Management Conference, PSAM15 2020

作者： Rokhforoz, Pegah Gjorgiev, Blazhe Sansavini, Giovanni Fink, Olga Chair of Intelligent Maintenance Systems ETH Zurich Switzerland Reliability and Risk Engineering Laboratory Institute of Energy Technology Department of Mechanical and Process Engineering ETH Zurich Switzerland

ISBN: (纸本)9789811485930

Condition-based and predictive maintenance enable early detections of critical system conditions and thereby enable decision makers to forestall the faults and mitigate them. However, the decision makers also need to take the operational and production needs into consideration to take an optimal decision when to perform the maintenance. Particularly in network systems, such as power grids, decision on the maintenance of single assets can affect the entire network and are, therefore, more complex. The paper proposes a two-level multi-agent system for the maintenance decision support (MDS) of power grids subject to an electrical market system. The MDS plays an important role in increasing the reliability of electrical market components. The aim of the MDS is to minimize the generation cost while maximizing the system reliability. The proposed framework integrates a central coordination system, the independent system operator (ISO) and distributed agents representing power generation units that act to maximize their profit and decide about the optimal maintenance time slots while ensuring the fulfilment of the energy demand. The objective function of agents (generation companies) is based on the reward and the penalty that they obtain from their power generation and their probability of failure, respectively. The optimal strategy of agents is then derived using a distributed algorithm, where agents choose their optimal maintenance decision and send their decisions to the independent system operator (ISO). The ISO determines the market price by considering the market reliability aspects. © ESREL2020-PSAM15 *** by Research Publishing, Singapore.

关键词： Decision support systems

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Exosomes in neurodegenerative diseases:Therapeutic potential and modification methods

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Neural Regeneration Research 2026年第2期21卷 478-490页

作者： Hongli Chen Na Li Yuanhao Cai Chunyan Ma Yutong Ye Xinyu Shi Jun Guo Zhibo Han Yi Liu Xunbin Wei Institute of Biomedical Engineering Chinese Academy of Medical Sciences&Peking Union Medical CollegeTianjinChina State Key Laboratory of Separation Membrane and Membrane Process&Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems School of Life SciencesTiangong UniversityTianjinChina School of Intelligent Information Engineering Medicine&Technology College of Zunyi Medical UniversityZunyiGuizhou ProvinceChina Tianjin Key Laboratory of Engineering Technologies for Cell Pharmaceuticals National Engineering Research Center of Cell ProductsAmCellGene Co.Ltd.TianjinChina Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Cancer Hospital&InstituteInternational Cancer InstituteInstitute of Medical TechnologyPeking University Health Science CenterDepartment of Biomedical EngineeringPeking UniversityBeijingChina

In recent years,exosomes have garnered extensive attention as therapeutic agents and early diagnostic markers in neurodegenerative disease *** are small and can effectively cross the blood-brain barrier,allowing them to target deep brain *** studies have demonstrated that exosomes derived from different cell types may exert therapeutic effects by regulating the expression of various inflammatory cytokines,mRNAs,and disease-related proteins,thereby halting the progression of neurodegenerative diseases and exhibiting beneficial ***,exosomes are composed of lipid bilayer membranes and lack the ability to recognize specific target *** limitation can lead to side effects and toxicity when they interact with non-specific *** evidence suggests that surface-modified exosomes have enhanced targeting capabilities and can be used as targeted drug-delivery vehicles that show promising results in the treatment of neurodegenerative *** this review,we provide an up-to-date overview of existing research aimed at devising approaches to modify exosomes and elucidating their therapeutic potential in neurodegenerative *** findings indicate that exosomes can efficiently cross the blood-brain barrier to facilitate drug delivery and can also serve as early diagnostic markers for neurodegenerative *** introduce the strategies being used to enhance exosome targeting,including genetic engineering,chemical modifications(both covalent,such as click chemistry and metabolic engineering,and non-covalent,such as polyvalent electrostatic and hydrophobic interactions,ligand-receptor binding,aptamer-based modifications,and the incorporation of CP05-anchored peptides),and nanomaterial *** into these strategies has confirmed that exosomes have significant therapeutic potential for neurodegenerative ***,several challenges remain in the clinical application of *** are needed in

关键词： Alzheimer’s disease cell recognition central nervous system diseases enhanced targeting exosome modification exosome targeting neurodegenerative disease Parkinson’s disease stem cell exosomes stem cell therapy

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Analysis of the shear stress at the interface between steel and cement grout

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Materials Today: Proceedings 2024年

作者： Ilhame Azdine Benaissa kissi Hamza Khatib Adil Ziraoui Structural Process Intelligent Systems and IT Engineering Laboratory (ISPSII) National School of Arts and Professions Hassan 2 University Casablanca Morocco

The selection of materials for bridge construction is crucially based on cost-effectiveness and efficient on-site assembly. The integration of prefabricated slabs in mixed bridges expedites construction but presents challenges with conventional connections, often prolonging site work. Addressing this challenge, a novel adhesive connection has emerged as a structural innovation, aiming to establish a robust bond between steel and prefabricated concrete slabs, there by optimizing construction timelines. This study scrutinizes the performance of the cement-steel interface under shear forces. Through numerical analysis, our research investigates the distribution of shear stress and normal stress within the compact element of the assessed interface. Methodologically, our analysis initially utilized Catia software for conception, followed by transforming the model into Ansys software for simulation purposes. This process elucidates the behavior and durability of the adhesive connection. Our research specifically focuses on two geometric configurations: AR1, where the grooves of the steel plats are oriented perpendicular to the applied loads, and AR2, where the grooves run parallel to the applied loads, shedding light on the distinctive advantages of this innovative connection approach.

关键词： Bridge Prefabricated slab Connection Interface Stress

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