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Self-Triggered Consensus Filtering over Asynchronous Communication Sensor Networks

Computer Modeling in engineering & Sciences 2023年第2期134卷 857-871页

作者： Huiwen Xue Jiwei Wen Akshya Kumar Swain Xiaoli Luan Key Laboratory of Advanced Process Control for Light Industry(Ministry of Education) Jiangnan UniversityWuxi214000China Department of Electrical Computer and Software EngineeringUniversity of AucklandAuckland0632New Zealand

In this paper,a self-triggered consensus filtering is developed for a class of discrete-time distributed filtering *** from existing event-triggered filtering,the self-triggered one does not require to continuously judge the trigger condition at each sampling instant and can save computational burden while achieving good state *** triggering policy is presented for pre-computing the next execution time for measurements according to the filter’s own data and the latest released data of its neighbors at the current ***,a challenging problem is that data will be asynchronously transmitted within the filtering network because each node self-triggers ***,a co-design of the self-triggered policy and asynchronous distributed filter is developed to ensure consensus of the state ***,a numerical example is given to illustrate the effectiveness of the consensus filtering approach.

关键词： Self-triggered policy sensor networks distributed consensus filtering

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Factor analysis thermography for defect detection of panel paintings

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Quantitative InfraRed Thermography Journal 2023年第1期20卷 25-37页

作者： Liu, Kaixin Huang, Kai-Lun Sfarra, Stefano Yang, Jianguo Yi, Liu Yuan, Yao Institute of Process Equipment and Control Engineering Zhejiang University of Technology Hangzhou China Department of Chemical Engineering National Tsing Hua University Hsinchu Taiwan Department of Industrial and Information Engineering and Economics University of L’Aquila L’Aquila Italy

Active infrared thermography is an important non-destructive testing method used for revealing defect structures in materials. In many applications, thermographic data processing is necessary to extract defect features from a large number of thermal images. This work proposes to use a factor analysis thermography (FAT) method that automatically extracts defect features from thermograms via exploratory factor analysis, in tandem with a fuzzy c-means (FCM) clustering algorithm to segment the defects and background. By means of factor rotation, factor analysis minimises the complexity of factor loadings and makes the results more interpretable. Consequently, the defect information is extracted while large signal-to-noise ratios are obtained. Employing the FCM image segmentation algorithm on factor loading images reduces the interference of background on human visual detection. Additionally, the parameter selection is emphasised and addressed. Experiments on a panel painting illustrate that the proposed method promotes the accuracy and efficiency of thermographic detection of defects, compared with the popular principal component thermography (PCT) method. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Nondestructive examination

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Metabolomics, network pharmacology, and microbiome analyses uncover the mechanisms of the Chinese herbal formula for the improvement of meat quality in spent hens

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Journal of Animal Science and Biotechnology 2025年第2期16卷 948-964页

作者： Zhihua Li Abul Kalam Azad Chengwen Meng Xiangfeng Kong Jue Gui Wenchao Lin Yadong Cui Wei Lan Qinghua He Department of Food Science and Engineering College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhenChina Hunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic Process National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry ProductionInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaChina School of Biology and Food Engineering Fuyang Normal UniversityFuyangChina

Background Meat originating from the spent hen is an important source of poultry meat production;however,multiple factors cause the decline in the meat quality of spent *** herbs have been widely used as medi-cine for a long time to prevent diseases and as nutrient supplements to improve the product *** experi-ment explored the effects of adding 1.0%Chinese herbal formula(CHF,including 0.30%Leonurus japonicus Houtt.,0.20%Salvia miltiorrhiza Bge.,0.25%Ligustrum lucidum Ait.,and 0.25%Taraxacum mongolicum Hand.-Mazz.)for 120 d to the spent hens’diet through metabolomics,network pharmacology,and microbiome *** The results indicated that CHF supplementation improved the meat quality by reducing drip loss(P<0.05),b*value(P=0.058),and shear force(P=0.099)and increasing cooked meat percentage(P=0.054)and dry matter(P<0.05)of breast *** addition of CHF improved the nutritional value of breast muscle by increasing(P<0.05)the content of C18:2n-6,n-6/n-3 polyunsaturated fatty acids(PUFA),total PUFA,PUFA-to-saturated fatty acids(SFA)ratio,and hypocholesterolemic-to-hypercholesterolemic ratio,and tending to increase serine content(P=0.069).The targeted metabolomics analysis revealed that the biosynthesis of SFA,linoleic acid metabolism,fatty acid degradation,fatty acid elongation,and fatty acid biosynthesis pathways were enriched by CHF ***,the network pharmacology analysis indicated that CHF was closely associated with oxidative stress and lipid *** CHF supplementation increased the glutathione peroxidase level(P<0.05)and upregulated gene expres-sion related to the Nrf2 pathway(including HO-1,P<0.05;Nrf2,P=0.098;CAT,P=0.060;GPX1,P=0.063;and SOD2,P=0.052)and lipid metabolism(including PPARγ,P<0.05;SREBP1,P=0.059;and CPT1A,P=0.058).Additionally,CHF supplementation increased Firmicutes and decreased Bacteroidetes,Spirochaetes,and Synergistetes abundances(P<0.05),which may contribute to better meat quality.C

关键词： Cecal microbiota Chinese herbal formula Fatty acid Meat quality Network pharmacology Spent hens

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Enhanced formation of trihalomethane disinfection byproducts from halobenzoquinones under combined UV/chlorine conditions

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Frontiers of Environmental Science & engineering 2022年第6期16卷 109-119页

作者： He Zhao Ching-Hua Huang Chen Zhong Penghui Du Peizhe Sun Beijing Engineering Research Center of Process Pollution Control Division of Environment Technology and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlantaGA 30332USA State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China

Halobenzoquinones(HBQs)are highly toxic disinfection byproducts(DBPs)and are also precursors of other DBPs such as trihalomethanes(THMs).The formation of THMs from HBQs during chlorine-only and UV/chlorine processes with or without bromide was investigated *** functional theory(DFT)reactivity descriptors were also applied to predict the nucleophilic/electrophilic reactive sites on HBQs and *** results were combined to explain the different behaviors of 2,6-dichloro-1,4-benzoquinone(2,6-DCBQ)and tetrachloro-1,4-benzoquinone(TCBQ)and to propose mechanism for the promoting roles of UV and hydroxylation of HBQs in THMs *** UV/chlorine,UV significantly enhanced THMs formation from 2,6-DCBQ compared to chlorine-only,mainly due to the production of OH-DCBQ^(*).Excited 2,6-DCBQ^(*)by UV benefited nucleophilic hydrolysis to produce OH-DCBQ^(*),which favored electrophilic attack by chlorine,thereby inducing more THMs ***/chlorine modestly promoted THMs formation from TCBQ compared to *** of TCBQ and UV irradiation were both important in promoting THMs formation due to the high electrophilic property of OH-TCBQ and TCBQ^(*).Meanwhile,hydroxylation of HBQs and CHCl3 formation were enhanced at higher *** work suggested that enhanced formation of THMs from HBQs should be considered in the application of combined UV and chlorine processes.

关键词： Halobenzoquinone Trihalomethane Chlorine disinfection UV irradiation Disinfection byproducts Combined UV/chlorine

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Investigation on Slug Flow Parameters Based on PIV Phase Discrimination

Investigation on Slug Flow Parameters Based on PIV Phase Dis...

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2023 Tianjin University-IET Electrical and Information engineering Doctoral Forum, TJU IET 2023

作者： Wang, Haixia Xue, Ting College of Electrical and Information Engineering Tianjin Key Laboratory of Process Measurement and Control Tianjin University Tianjin China

ISBN: (纸本)9781839539824

Investigation of synchronously acquiring multiple parameters holds valuable insights into flow characteristics. When employing particle image velocimetry in gas-liquid slug flow, the integration of phase discrimination assumes an unequivocal role. This not only facilitates the separation of gas and liquid phases to distinctly capture velocity field distributions but also enables the extraction of characteristic parameters beyond velocity from gas or liquid phase. In this study, in addition to velocity measurements employing particle image velocimetry, structural parameters measurement methodologies within slug flow, such as liquid film thickness and elongated bubble length, are introduced based on phase discrimination results. By leveraging the inherent relationships among flow rate parameters, the measurement parameters are cross-validated based on experimental findings to assess the feasibility of the method. Ultimately, an exploration and analysis of flow characteristics in slug flow under different flow conditions are undertaken. © The Institution of engineering & Technology 2023.

关键词： Velocity measurement

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Stability and bifurcation analysis of delayed tri-trophic food chain model in poisoned environment with fear effect and additional food

Stability and bifurcation analysis of delayed tri-trophic fo...

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作者： Ramasamy, Sivasamy Banjerdpongchai, David Park, PooGyeon Center of Excellence in Intelligent Control Automation of Process Systems Department of Electrical Engineering Faculty of Engineering Chulalongkorn University Bangkok Thailand Department of Electrical Engineering Pohang University of Science and Technology Pohang Korea Republic of

One of the most important goals of theoretical ecologists is to find a strategy for controlling the chaos in ecological models to maintain healthy ecosystems. We investigate the influence of fear and the supply of additional food to predators in a delayed tri-trophic food chain model, where interference among the species is determined by Holling type-II functional response. The proposed model incorporates the fact that the growth rates of prey and middle predators are decreased due to the fear of middle and special predators, respectively. The additional food is supplied to both predators by either nature or external agencies. Furthermore, the poisoned prey in the predator's environment is taken into account. In the proposed model, we use two time delays: one for the growth term of the middle predator and another for the gestation delay of the special predator. We determine the conditions for the existence of ecologically feasible equilibrium points and their local and global stability. In addition, we establish the conditions for the existence of Hopf bifurcation around interior equilibrium to seek periodic behavior in nondelayed and delayed models. Numerical investigations are performed to justify the proposed theoretical findings through phase portraits, time series of solutions, and bifurcation diagrams. We observe that the chaotic dynamics of a tri-trophic food chain model can be controlled by the proper choice of the fear effect and by supplying additional food parameters. As a result, our findings provide more ecological insights into the dynamics of the delayed tri-trophic food chain model with the fear effect and additional food supply. © 2023 John Wiley & Sons, Ltd.

关键词： Hopf bifurcation

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Attacks on Data-Driven process Monitoring Systems: Subspace Transfer Networks

IEEE Transactions on Artificial Intelligence

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IEEE Transactions on Artificial Intelligence 2022年第3期3卷 470-484页

作者： Jiang, Xiaoyu Ge, Zhiqiang Zhejiang University State Key Laboratory of Industrial Control Technology Institute of Industrial Process Control College of Control Science and Engineering Hangzhou310027 China Peng Cheng Laboratory Shenzhen518000 China

With the rapid development of information technology, intelligent upgrading of the manufacturing industry has broken the closed environment of traditional industrial control systems (ICS);thus, the information security of ICS has been seriously threatened. As part of ICS, the process monitoring system (PMS) is heavily subject to external risks. Data-driven PMSs have been widely used as initial lines of defense to ensure ICS safety. Once the PMS is under attack, the consequences on the whole ICS will be unimaginable. Unfortunately, the safety issues of the PMS have received inadequate attention. This article reveals PMS's vulnerabilities through effective attacks. A novel method called subspace transfer network (STN) is proposed to conduct adversarial and poisoning attacks on the PMS simultaneously. Then the attack task flow is defined and explained to make online adversarial attacks and data poisoning on PMS. Meanwhile, aiming at two poisoning goals, targeted and untargeted attacks of STN are designed, respectively. Finally, the PMS's fragility is verified in two industrial benchmarks. © 2020 IEEE.

关键词： Security of data

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Feedforward control of flat hybrid automata: a behavioral systems theory approach 63

Feedforward control of flat hybrid automata: a behavioral sy...

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63rd IEEE Conference on Decision and control, CDC 2024

作者： Zahn, Frederik Kleinert, Tobias Hagenmeyer, Veit Karlsruhe Institute of Technology Institute for Automation and Applied Informatics Karlsruhe Germany Rwth Aachen University Chair of Process Control Engineering Aachen Germany

ISBN: (纸本)9798350316339

Differential flatness has been defined in the literature for continuous time dynamical systems and for discrete time systems. We define flatness of automata from the perspective of behavioral systems theory, and synthesize a flatness definition for hybrid automata. These new definitions allow for feedforward trajectory generation for flat hybrid automata. Additionally, we provide necessary and sufficient conditions of hybrid automaton flatness for different types of continuous state constraints and switching conditions, and how to compute whether a hybrid automaton is flat. We illustrate feedforward trajectory generation based on our findings for a robotic manipulator example. © 2024 IEEE.

关键词： Continuous time systems

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Distributed state estimation for linear timeinvariant dynamical systems:A review of theories and algorithms

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Chinese Journal of Aeronautics 2022年第6期35卷 1-17页

作者： Shuaiting HUANG Yuzhe LI Junfeng WU College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China State Key Laboratory of Synthetical Automation for Process Industries Northeastern UniversityShenyang 110004China

Distributed state estimation is of paramount importance in many applications involving the large-scale complex systems over spatially deployed networked *** paper provides an overview for analysis of distributed state estimation algorithms for linear time invariant systems.A number of previous works are reviewed and a clear classification of the main approaches in this field are presented,i.e.,Kalman-filter-type methods and Luenberger-observer-type *** design and the stability analysis of these methods are ***,a comprehensive comparison of the existing results is provided in terms of some standard metrics including the graph connectivity,system observability,optimality,time scale and so ***,several important and challenging future research directions are discussed.

关键词： Dynamical systems Distributed estimation Kalman filter Luenberger observer Linear systems Multi agent systems State estimation

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EFFICIENCY COMPARISON OF DMC AND GPC ALGORITHMS FOR MULTIDIMENSIONAL HIGH ORDER OBJECTS

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International Journal of Energy for a Clean Environment 2022年第4期23卷 79-93页

作者： Plamowski, Sebastian Kephart, Richard W. Institute of Control and Computation Engineering Warsaw University of Technology Warszawa Poland Emerson Process Management PittsburghPA United States

The purpose of this paper is to compare the effectiveness of two different predictive control algorithms: dynamic matrix controller (DMC) and generalized predictive controller (GPC) in systems with multiple input signals. The study focused on conditions that result in high order models. It is shown that, depending on the identification method and the number of inputs, the resulting models can be of high order. The application of these models to a control/regulation law can cause numerical errors. This property is visible only in certain conditions. Numerical problems appear gradually with increasing model order and occur during the internal model prediction stage of which the results are not directly visible outside of the algorithm. Examples are included where the problem discussed is demonstrated along with subsequent results for both algorithms. Several methods to weaken or even eliminate this problem are indicated. Conditions under which the use of a different type of controller should be considered are discussed. The obtained results and formulated conclusions are valuable both for practitioners implementing predictive control in industry and theoreticians studying the properties of predictive algorithms. © 2022 by Begell House, Inc. ***

关键词： controllers

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