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Decentralized Dual Operator Splitting for Nonsmooth Composite Optimization

IEEE TRANSACTIONS ON NETWORK SCIENCE AND ENGINEERING 2022年第4期9卷 2084-2097页

作者： Li, Huaqing Ding, Wentao Wang, Zheng Lu, Qingguo Li, Yongfu Xia, Dawen Southwest Univ Chongqing Key Lab Nonlinear Circuits & Intelligen Coll Elect & Informat Engn Chongqing 400715 Peoples R China Univ New South Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia Chongqing Univ Coll Comp Sci Chongqing 400044 Peoples R China Chongqing Univ Posts & Telecommun Key Lab Intelligent Air Ground Cooperat Control U Coll Automat Chongqing 400065 Peoples R China Guizhou Minzu Univ Coll Data Sci & Informat Engn Guiyang 550025 Peoples R China

Inspired by the advantages of the decentralized network structure in large-scale data processing and system robustness, this paper considers a fully distributed computation strategy for a nonsmooth composite optimization problem. The goal is to solve the problem only by resorting to local computation and local communications. Here, the local objective function is composed of two possibly nonsmooth functions where one is strongly convex and the other is proper closed convex (not necessarily strongly convex). Through associating variables with the agents and edges of the network, a decentralized synchronous algorithm is developed based on the dual operator splitting method. The asynchronous version of the proposed algorithm is further developed based on the randomized block coordinate descent technique, where each agent performs the algorithm only under its independent activation. Then the convergence analysis is provided depending on the fixed point iterations and the property of strong duality. Simulations on regularized problems demonstrate the effectiveness of the proposed decentralized algorithm.

关键词： Signal processing algorithms Linear programming Cost function Convex functions Symmetric matrices Signal processing Resource management Decentralized optimization multi-agent system nonsmooth problem asynchronous algorithm randomized block coordinate uncoordinated stepsize

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Leader-following Consensus of Multi-agent Systems via a Hybrid Protocol with Saturation Effects

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INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS 2021年第1期19卷 124-136页

作者： Hu, Xiang Zhang, Zufan Li, Chuandong Li, Liangliang Chongqing Univ Posts & Telecommun Sch Commun & Informat Engn Chongqing Key Lab Mobile Commun Technol Chongqing 400065 Peoples R China Southwest Univ Coll Elect & Informat Engn Chongqing Key Lab Nonlinear Circuits & Intelligen Chongqing 400715 Peoples R China

In this paper, a hybrid protocol which can control multi-agent systems to achieve "leader-following consensus" is proposed, the control protocol is periodic and is composed of continuous control and impulse control. Considering the power limitation and the time error of the actual industrial production equipments, the impulse saturation effects and the impulse time window are introduced. In this paper, the multi-agent system is modeled, one of the agents is designated as the leader, and the rest of the agents are the followers. Then the error system equations of the multi-agent system is derived. The stability of the error system is analyzed by constructing the Lyapunov function. Theorem 1 and theorem 2 are obtained as the criteria of state consensus of the multi-agent system. Finally, a numerical experiment is carried out to verify the reliability and efficiency of the conclusions are given in this paper. Because it takes into account the impulse time window and impulse saturation effects, which is more in line with the actual industrial production.

关键词： Impulse control impulse saturation effects impulse time window leader-following consensus multiagent systems

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A Switched Integral-Based Event-Triggered Control of Uncertain nonlinear Time-Delay System With Actuator Saturation

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IEEE TRANSACTIONS ON CYBERNETICS 2022年第11期52卷 11335-11347页

作者： Li, Hongfei Zhang, Liruo Zhang, Xiaoyu Yu, Junzhi Peking Univ Coll Engn State Key Lab Turbulence & Complex Syst Dept Adv Mfg & RobotBIC ESAT Beijing 100871 Peoples R China Univ Auckland Dept Elect & Comp Engn Auckland 1142 New Zealand Southwest Univ Coll Elect & Informat Engn Chongqing Key Lab Nonlinear Circuits & Intelligen Chongqing 400715 Peoples R China

This article explores the asymptotic stabilization criteria of the uncertain nonlinear time-delay system subject to actuator saturation. A switched integral-based event-triggered scheme (IETS) is established to reduce the redundant data transmission over the networks. The switched IETS condition uses the integration of system states over a time period in the past. A fixed waiting time is included to avoid the Zeno behavior. In order to estimate a larger domain of attraction, a delay-dependent polytopic representation method is presented to deal with the effects of actuator saturation in the proposed model. A new series of less conservative linear matrix inequalities (LMIs) is proposed on the basis of delay-dependent Lyapunov-Krasovskii functional (LKF) to ensure the stability of nonlinear time-delay system subject to actuator saturation using the proposed IETS. Numerical examples are used to confirm the effectiveness and advantages of the proposed IETS approach.

关键词： Switches Actuators Control systems Delays Symmetric matrices Stability criteria Numerical stability Actuator saturation event-triggered stabilization nonlinear time-delay system

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Mate preference and brain oscillations: Initial romantic attraction is associated with decreases in alpha- and lower beta-band power

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HUMAN BRAIN MAPPING 2022年第2期43卷 721-732页

作者： Yuan, Guangjie Liu, Guangyuan Southwest Univ Coll Elect & Informat Engn 2 Tiansheng Rd Chongqing 400700 Peoples R China Southwest Univ Inst Affect Comp & Informat Proc Chongqing Peoples R China Southwest Univ Chongqing Key Lab Nonlinear Circuits & Intelligen Chongqing Peoples R China Southwest Univ Key Lab Cognit & Personal Minist Educ Fac Psychol Chongqing Peoples R China

Initial romantic attraction (IRA) refers to a series of positive reactions (such as feelings of exhilaration and compulsive thinking) toward desirable potential partners, usually at initial or early-stage encounters when no close relationship has yet been established. After decades of effort, the evolutionary value and key characteristics of IRA are well understood. However, the brain mechanisms associated with IRA are unclear. To address this question, we simulated a mate selection platform similar to that of Tinder. When participants assessed their romantic interest in potential partners on the platform, their electroencephalogram (EEG) signals were recorded in real time. The behavioral data demonstrated that IRA to ideal potential partners mainly reflects the dimensions of arousal and domination. The main study finding was that processing of the individual preference faces that resulted in IRA was associated with a decrease in power in the alpha and lower beta bands over the posterior and anterior sensor clusters;this occurred between 870 and 2,000 ms post-stimulus. key findings regarding event-related potentials (ERPs) sensitive to individual stimuli preferences were replicated. The results support the hypothesis that brain oscillations in the alpha and lower beta range may reflect modulation in cortical activity associated with individual mate preferences.

关键词： event-related desynchronization event-related potential individual preference mate selection romantic attraction

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Electroencephalography-based recognition of six basic emotions in virtual reality environments

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BIOMEDICAL SIGNAL PROCESSING AND CONTROL 2024年 93卷

作者： Xie, Jialan Luo, Yutong Wang, Shiyuan Liu, Guangyuan Southwest Univ Coll Elect & Informat Engn Chongqing 400715 Peoples R China Southwest Univ Chongqing Key Lab Nonlinear Circuits & Intelligent Chongqing 400715 Peoples R China Southwest Univ Inst Affect Comp & Informat Proc Chongqing 400715 Peoples R China Southwest Univ Fac Psychol Key Lab Cognit & Personal Minist Educ Chongqing 400715 Peoples R China

Emotion recognition (ER) in virtual reality (VR) environments has attracted increasing attention in the field of affective computing and human-computer interaction (HCI). Electroencephalography (EEG) is an effective tool for capturing human emotions and mental states, and the demand for collecting and analyzing EEG signals in VR environments has been on the increase. In this study, we built an EEG dataset for six basic emotions in VR environments-that is, the VR six discrete emotional EEG data (VRSDEED) dataset-and developed a machinelearning framework for classifying emotional states using it. Fifty participants were shown six VR emotioninducing videos while their EEG signals were recorded. To determine the optimal features and classification methods, we extracted four frequency-domain features and applied five different machine-learning algorithms. To enhance prediction performance, we fused different features and used recursive feature elimination with cross-validation for feature selection. Classification performance was assessed using accuracy and F1-scores. Our findings demonstrated that (1) the light gradient-boosting machine algorithm achieved the highest average classification accuracy of 89.94%;(2) isolated features achieved the highest accuracy of 89.50% in the gamma frequency band and feature fusion enhanced recognition performance;(3) the theta and gamma frequency bands were more significant in emotion processing than other bands. The proposed dataset and framework should serve as valuable resources and provide insights for research on ER in VR environments.

关键词： Classification Emotion recognition Electroencephalography (EEG) Six basic emotions Virtual reality

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An integrated magnetoimpedance biosensor microfluidic magnetic platform for the evaluation of the cardiac marker cTnI

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ANALYTICAL METHODS 2025年第5期17卷 990-998页

作者： Yang, Zhen Chen, Jingyuan Liu, Mengyu Huang, Jiabao Liang, Jieping Zhu, Mengjiao Shen, Yuanwei Li, Danqing Lei, Chong Sun, Xuecheng Guangxi Normal Univ Sch Elect & Informat Engn Guangxi Key Lab Brain inspired Comp & Intelligent Gulin 541004 Guangxi Peoples R China Guangxi Normal Univ Educ Dept Guangxi Zhuang Autonomous Reg Key Lab Integrated Circuits & Microsyst Guilin 541004 Guangxi Peoples R China Natl Univ Singapore Inst Hlth Innovat & Technol Singapore 117599 Singapore Guizhou Med Univ Affiliated Hosp Guiyang 550009 Peoples R China Shanghai Jiao Tong Univ Sch Elect Informat & Elect Engn Dept Micronano Elect Natl Key Lab Adv Micro & Nano Manufacture Technol Shanghai 200240 Peoples R China Shanghai Univ Microelect Res & Dev Ctr Sch Mechatron Engn & Automat Shanghai 200444 Peoples R China

An integrated magnetoimpedance (MI) biosensor microfluidic magnetic platform was proposed for the evaluation of the cardiac marker, cardiac troponin I (cTnI). This bioanalyte evaluation platform mainly comprised three external permanent magnets (PMs), one MI element, two peelable SiO2 film units and a microfluidic chip (MFC). The MI element was made of micro-electro-mechanical system (MEMS)-based multilayered [Ti (6 nm)/FeNi (100 nm)]5/Cu (400 nm)/[Ti (6 nm)/FeNi (100 nm)]5 thin films and designed as meander structures with closed magnetic flux. The MFC was fabricated using 3D printing and inverted molding techniques, designed with a solution by mixing the reaction region, magnetic separation region and detection region. Peelable SiO2 film units with the same size as the MI sensing element were used as the immunoreactivity interface of the bioanalytes. Two large PMs were placed directly below the MI sensing unit to provide a bias magnetic field, and the smaller PM was embedded in MCF for magnetic separation function. Different concentrations of the biological target (cTnI antigen)-, PBS buffer-, and Dynabeads-labeled polyclonal cTnI antibody solution were injected sequentially into the MCF. After immunoreactivity and magnetic separation, a classical sandwich immunoreaction process occurred on the surface of the monoclonal antibody-modified SiO2 film via self-assembling process in the reaction region of the MFC. The fundamental principle for evaluation of cTnI was based on variations of the MI signal under different concentrations of the biological target coupled with different numbers of Dynabeads. It was demonstrated that the mentioned MI-based magnetic platform could perform quantitative detection analyses over a range of cTnI concentrations (lowest concentration = 0.1 ng mL-1 and highest concentration = 100 ng mL-1). The proposed MI-based magnetic platform provides a sensitive, reliable, stable and reusable bioanalytical platform, and it has potential in future b

关键词： Permanent magnets

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Enhanced antibacterial activity with increasing P doping ratio in CQDs

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RSC ADVANCES 2022年第43期12卷 27709-27715页

作者： Chai, Shuiqin Zhou, Lijia Chi, Yuting Chen, Linshuo Pei, Shuchen Chen, Bin Chongqing Univ Sci & Technol Chongqing Key Lab Ind Fermentat Microorganism Chongqing 401331 Peoples R China Chongqing Univ Sci & Technol Coll Chem & Chem Engn Chongqing 401331 Peoples R China Southwest Univ Chongqing Key Lab Nonlinear Circuit & Intelligent Coll Elect & Informat Engn Chongqing 400715 Peoples R China

It is an urgent challenge to develop efficient antibacterial agents against resistant bacteria in the treatment of infectious diseases. Carbon quantum dots (CQDs) have attracted much attention owing to their good stability, low toxicity and excellent biocompatibility. In this work, CQDs doped with different contents of the element phosphorus (P) were prepared by a simple hydrothermal method using valine as a carbon source, triethylamine as a nitrogen source and different volumes of phosphoric acid as a phosphorus source. The average diameter and the surface charge could be regulated from 2.89 nm to 1.56 nm and +2.58 mV to +5.47 mV by increasing the content of the element P in these CQDs. Importantly, these CQDs showed effective bacterial inhibition against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The minimal inhibitory concentration (MIC) decreased from 0.71, to 0.51 to 0.18 mg mL(-1) on E. coli and S. aureus with the increase of P element content. Furthermore, the morphologies of E. coli cells and S. aureus were damaged and became irregular upon treatment with these CQDs. The results of singlet oxygen (O-1(2)) detection demonstrated that intracellular O-1(2) was generated during the antibacterial process. We speculated that bacterial inhibition induced by these CQDs was accompanied by disruption of permeability and structural integrity, owing to strong electrostatic interactions between negatively charged bacteria and positively charged CQDs and production of singlet oxygen of CQDs. Together, this study indicates that the CQDs can be a candidate to treat resistant bacterial infections and may improve the understanding of killing pathogens by antibacterial CQD drugs.

关键词： Semiconductor quantum dots

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Analysis of Magnetic Properties of Magnetostrictive FeCoGa Thin Film Patterns Grown on Flexible Substrates

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JOURNAL OF ELECTRONIC MATERIALS 2025年第5期54卷 3708-3718页

作者： Yang, Zhen Meng, Ziqin Huang, Jiabao Cao, Jian Zhang, He Sun, Xuecheng Lei, Chong Guangxi Normal Univ Sch Elect & Informat Engn Guangxi Key Lab Brain Inspired Comp & Intelligent Guilin 541004 Peoples R China Guangxi Normal Univ Educ Dept Guangxi Zhuang Autonomous Reg Key Lab Integrated Circuits & Microsyst Guilin 541004 Peoples R China Natl Univ Singapore Inst Hlth Innovat & Technol Singapore 117599 Singapore Guangxi Radio & Televis Technol Ctr Chongzuo Branch Chongzuo 532200 Peoples R China Shanghai Univ Microelect Res & Dev Ctr Sch Mechatron Engn & Automat Shanghai 200444 Peoples R China Shanghai Jiao Tong Univ Sch Elect Informat & Elect Engn Dept Micronano Elect Natl Key Lab Adv Micro & Nano Manufacture Technol Shanghai 200240 Peoples R China

Magnetostrictive thin films deposited on flexible substrates have garnered significant attention due to their diverse applications in flexible magnetoelectronic devices, including flexible magnetic memory devices, sensors, and high-frequency devices. In this work, magnetostrictive FeCoGa thin films were deposited on polyimide (PI), polyester (PET), and mica flexible substrates. The rectangular and dumbbell-shaped thin film patterns with varying sizes were designed and implemented using microelectromechanical systems (MEMS) technology. The films were characterized using scanning electron microscopy (SEM), x-ray diffraction (XRD), vibrating sample magnetometry (VSM), and impedance analyzer. The results showed that magnetostrictive amorphous FeCoGa films were effectively formed on these flexible substrates. The patterns on the PI substrate exhibited low coercivity and the highest quality factor, while the patterns on the mica substrate demonstrated the lowest residual magnetism. The dumbbell-shaped patterns exhibited higher magnetic response sensitivity than the rectangular film patterns. Notably, the variation in resonance frequency between the array patterns was extremely small, at less than 0.18%, indicating excellent reproducibility and consistency of the magnetic properties of the patterns. The results confirmed the superior performance of dumbbell-shaped FeCoGa magnetostrictive film patterns on flexible substrates, providing valuable insights for the design of flexible magnetostrictive sensors.

关键词： Magnetostrictive thin film patterns response sensitivity flexible substrate magnetic properties

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Multifunctional all-nanofiber cloth integrating personal health monitoring and thermal regulation capabilities

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INFOMAT 2025年第1期7卷

作者： Wang, Peng Sun, Guifen Hua, Shuaichuang Yu, Wei Meng, Chuizhou Han, Qing Kim, Jeonghyun Guo, Shijie Shen, Guozhen Li, Yang Hebei Univ Technol Sch Mech Engn State Key Lab Reliabil & Intelligence Elect Equipm Hebei Key Lab Smart Sensing & Human Robot Interact Tianjin 300401 Peoples R China Univ Jinan Sch Mech Engn Jinan Peoples R China Kwangwoon Univ Dept Elect Convergence Engn Seoul South Korea Beijing Inst Technol Sch Integrated Circuits & Elect Beijing 100081 Peoples R China Univ Jinan Sch Informat Sci & Engn Shandong Prov Key Lab Network Based Intelligent Co Jinan Peoples R China Shandong Univ Sch Microelect Jinan 250101 Peoples R China Fudan Univ State Key Lab Integrated Chips & Syst Shanghai Peoples R China

Frequent heat waves and cold spells pose threats to human survival. Herein, we develop a multifunctional all-nanofiber cloth with physiological signal monitoring and personal thermal management capabilities through facile fiber electrospinning and ink printing techniques. The double-sided fabric mat of a thick carbon nanotube network with high solar absorption on top of a thermoplastic polyurethane nanofiber substrate with high solar reflectivity and mid-infrared emissivity offers a contrary thermal management effect of heating or cooling by opposite wearing mode. The integrated fabric strain and temperature sensors for health status evaluation through monitoring physiological signals of respiration and body temperature. By wearing a T-shirt tailored by the developed electronic cloth, the wearer's skin temperature can be actively regulated with cooling by 5.4 degrees C and warming by 3.0 degrees C in hot and cold environments compared to normal clothing, respectively. This platform can inspire further studies in wearable multifunctional permeable *** We develope a multifunctional all-nanofiber cloth with physiological signal monitoring and personal thermal management capabilities through facile fiber electrospinning and ink printing ***

关键词： electrospun nanofiber passive radiative cooling personal thermal management solar heating strain sensor temperature sensor

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A Distributed Dual Proximal Algorithm for Non-Smooth Composite Constrained Optimization and Its Application 40

A Distributed Dual Proximal Algorithm for Non-Smooth Composi...

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40th Chinese Control Conference (CCC)

作者： Ran, Liang Hu, Jinhui Liu, Hongli Li, Huaqing Southwest Univ Chongqing Key Lab Nonlinear Circuits & Intelligen Coll Elect & Informat Engn Chongqing 400715 Peoples R China

ISBN: (纸本)9789881563804

Distributed optimization is a promising prospect that shows high potential in various applications, such as machine learning, power systems and others. This paper studies a class of constrained composite optimization problems over a network of agents, in which the local cost functions that are privately maintained by agents can be split into a strongly convex term and a convex (or possibly non-smooth) one. To tackle this problem in a distribute manner, a class of synchronous distributed algorithms based on dual proximal methods (SynDis-DuPro) is presented, and its asynchronous version (AsynDis-DuPro) without the global clock is developed as well. Under the proposed schemes, each agent in the network not only possesses the individual step-sizes, but also conducts local computation and communication without leaking its private information. In addition, the practicability and effectiveness of the proposed algorithms are demonstrated by the simulations on distributed energy resources coordination (DERC) based on power systems.

关键词： Convex optimization multi-agent systems distributed algorithms non-smooth constrained optimization problems

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