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Utility coupling promotes cooperation in multiplayer snowdrift games on interdependent simplicial networks

The European Physical Journal Special Topics 2023年第4期233卷 831-842页

作者： Wang, Juan Guo, Shiqiang Xia, Chengyi Perc, Matjaž Tianjin Key Laboratory for Control Theory and Complicated Industry Systems Tianjin University of Technology Tianjin People’s Republic of China School of Electrical Engineering and Automation Tianjin University of Technology Tianjin People’s Republic of China School of Artificial Intelligence Tiangong University Tianjin People’s Republic of China Faculty of Natural Sciences and Mathematics University of Maribor Maribor Slovenia Alma Mater Europaea Maribor Slovenia Complexity Science Hub Vienna Vienna Austria Department of Physics Kyung Hee University Seoul Republic of Korea

Real-world social networks often contain not only one-to-one pairwise interactions, but also multi-person group interactions involving more than two individuals. To reveal the important role of such group interactions (i.e., higher order topology) for the evolution of cooperation, we here use interdependent simplicial network topologies, where the evolutionary interactions, governed by the snowdrift game, are thus explored beyond pairwise links. We also consider utility coupling between two network layers in an uncorrelated interdependence. Systematic Monte Carlo simulations lead us to two main conclusions. First, we find that the level of cooperation can be elevated by increasing the utility coupling value. And second, cooperation tends to decline when we increase the number of 2-simplex interactions. However, despite the later result, the overall cooperation level on both interdependent networks is still higher than that on any isolated network. We hope that these results will inspire future research on cooperation among unrelated individuals in higher order networks.

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On feasible sets for coalitional MPC 58

On feasible sets for coalitional MPC

引用

58th IEEE Conference on Decision and control, CDC 2019

作者： Baldivieso Monasterios, P.R. Trodden, P.A. Cannon, M. University of Sheffield Department of Automatic Control and Systems Engineering Sheffield United Kingdom University of Oxford Department of Engineering Science Oxford United Kingdom

ISBN: (纸本)9781728113982

This paper presents novel results and observations on the analysis of tube-based controllers for Large-Scale systems. These systems group several, possibly heterogeneous, interconnected subsystems into a single entity. Different subgroupings of subsystems lead to different coupling structures that have an impact on the design of robust decentralised controllers. We study the nesting properties of feasible regions and robust positive invariant sets for different partitions of the large-scale system in terms of partial order relations induced by the power set of the elements composing it. © 2019 IEEE.

关键词： Large scale systems

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Impact of Current Limitation of Grid-forming Voltage Source Converters on Power System Stability

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IFAC-PapersOnLine 2020年第2期53卷 13520-13524页

作者： Christian Schöll Hendrik Lens University of Stuttgart Institute of Combustion and Power Plant Technology (IFK) Department Power Generation and Automatic Control Pfaffenwaldring 23 70569 Stuttgart Germany

Grid-forming voltage source converters (VSC) have important characteristics of synchronous generators (SG). These include the provision of inertia and, in particular, voltage source behavior. These properties are required to make interconnected power systems with up to 100 % converter based generation possible. However, grid-forming VSC can not replace an important feature of SG: overcurrent capability. This property of SG contributes to power system stability. In the case of severe disturbances, SG may initially be overloaded before the load is gradually shared with other feed-ins. Due to the risk of damage, VSC have an overcurrent protection. However, most grid-forming VSC control concepts do not incorporate a sophisticated overcurrent limitation. This paper shows, by means of simulations, that current limiting of grid-forming VSC can lead to significant power system stability issues due to unsuccessful load sharing between other feed-ins. In addition, the paper shows, that with an increasing share of constant power loads, these issues can occur sooner.

关键词： Power system stability voltage source converter current limitation

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ON THE CONVERGENCE OF MSGD AND ADAGRAD FOR STOCHASTIC OPTIMIZATION

arXiv

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arXiv 2022年

作者： Jin, Ruinan Xing, Yu He, Xingkang LSC NCMIS Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China School of Mathematical Sciences University of Chinese Academy of Sciences Beijing100049 China Division of Decision and Control Systems KTH Royal Institute of Technology StockholmSE-100 44 Sweden Department of Electrical Engineering University of Notre Dame IN United States

As one of the most fundamental stochastic optimization algorithms, stochastic gradient descent (SGD) has been intensively developed and extensively applied in machine learning in the past decade. There have been some modified SGD-type algorithms, which outperform the SGD in many competitions and applications in terms of convergence rate and accuracy, such as momentum-based SGD (mSGD) and adaptive gradient algorithm (AdaGrad). Despite these empirical successes, the theoretical properties of these algorithms have not been well established due to technical difficulties. With this motivation, we focus on convergence analysis of mSGD and AdaGrad for any smooth (possibly non-convex) loss functions in stochastic optimization. First, we prove that the iterates of mSGD are asymptotically convergent to a connected set of stationary points with probability one, which is more general than existing works on subsequence convergence or convergence of time averages. Moreover, we prove that the loss function of mSGD decays at a certain rate faster than that of SGD. In addition, we prove the iterates of AdaGrad are asymptotically convergent to a connected set of stationary points with probability one. Also, this result extends the results from the literature on subsequence convergence and the convergence of time averages. Despite the generality of the above convergence results, we have relaxed some assumptions of gradient noises, convexity of loss functions, as well as boundedness of iterates. Copyright © 2022, The Authors. All rights reserved.

关键词： Machine learning

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Deep Learning-based Algorithm for Mobile Robot control in Textureless Environment

Deep Learning-based Algorithm for Mobile Robot Control in Te...

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Mechatronics systems and Materials (MSM)

作者： Milica Petrović Arkadiusz Mystkowski Aleksandar Jokić Lazar Đokić Zoran Miljković Production Engineering Department University of Belgrade Belgrade Serbia Department of Automatic Control and Robotics Bialystok University of Technology Bialystok Poland

ISBN: (数字)9781728169569

ISBN: (纸本)9781728169576

For the implementation of stereo image-based visual servoing algorithm in the eye-in-hand robotics applications, one of the main concerns is the accurate point feature detection and matching algorithm. Since the visual servoing is carried out in the textureless environment, the feature detection process is even more challenging. To fulfill the requirement of a robust and reliable point feature detection process, in this paper we present the novel deep learning-based algorithm. The approach based on convolutional neural networks and algorithm for detection of manufacturing entities is proposed and detected regions of interest are utilized for the improvement of the point feature detection algorithm. The proposed algorithm is experimentally evaluated in real-world settings by using wheeled nonholonomic mobile robot RAICO equipped with stereo vision system. The experimental results show the improvement of 58% in the accuracy of matched point features in the images obtained during the visual servoing process. Moreover, with the implementation of the proposed deep learning-based approach, the number of successful experimental runs has increased by 80%.

关键词： Feature extraction Mobile robots Visual servoing Manufacturing Classification algorithms Cameras

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Multivalent Display of Lipophilic DNA Binders for Dual-Selective Anti-Mycobacterium Peptidomimetics with Binary Mechanism of Action

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CCS Chemistry 2022年第11期4卷 3573-3586页

作者： Jianxue Wang Junfeng Song Xianhui Chen Rey-Ting Guo Yingjie Wang Guopu Huang Nan Zheng Peilei Hu Xinxin Feng Yugang Bai State Key Laboratory of Chem-/Bio-Sensing and Chemometrics Hunan Provincial Key Laboratory of Biomacromolecular Chemical BiologySchool of Chemistry and Chemical EngineeringHunan UniversityChangshaHunan 410082 State Key Laboratory of Biocatalysis and Enzyme Engineering School of Life SciencesHubei UniversityWuhanHubei 430062 Institute of Systems and Physical Biology Shenzhen Bay LaboratoryShenzhenGuangdong 518055 Department of Polymer Science and Engineering School of Chemical EngineeringDalian University of TechnologyDalianLiaoning 116024 Hunan Institute for Tuberculosis Control Hunan Chest HospitalChangshaHunan 410013

We made oligoamidine-based peptidomimetics highly specific for mycobacteria eradication by introducing and arraying lipophilic DNA binding motifs on macromolecular *** short poly(amidino-phenylindole)(PAPI)structures feature an alternating amphiphilic structure with cationic,lipophilic DNA-binding moieties,enabling fast and selective eradication of mycobacteria through binary,membrane-and DNA-selective mechanisms of *** importantly,PAPIs address the primary treatment challenge by combating mycobacteria in eukaryotic cells and working as a sensitizer for conventional antibiotics,in bothways promoting more thorough removal of pathogens and reducing the mycobacteria’s resistance generation rate during *** optimizationwas achieved to counter specific pathogens,including Mycobacterium tuberculosis,in the Mycobacterium *** of the hit peptidomimetics was evaluated in a zebrafish-based aquatic infection model using Mycobacterium fortuitum and a mice tail infection model using Mycobacterium marinum,both revealing excellent in vivo performance.

关键词： peptidomimetic mycobacteria antimicrobial membrane disruption DNA binding

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Model Predictive Displacement control Tuning for Tap-Water-Driven Muscle By Inverse Optimization with Adaptive Model Matching and Analysis of Contribution

Research Square

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Research Square 2021年

作者： Tsuruhara, Satoshi Inada, Ryo Ito, Kazuhisa Graduate School of Mechanical Engineering Shibaura Institute of Technology 307 Fukasaku Minuma Saitama3378570 Japan Department of Machinery and Control Systems Shibaura Institute of Technology 307 Fukasaku Minuma Saitama3378570 Japan

The tap-water-driven McKibben muscle has many advantages and is expected to be applied in mechanical systems that require a high degree of cleanliness. However, the muscle has strong asymmetric hysteresis characteristics that depend on the load, and these problems prevent its widespread use. In this study, a novel control method - model predictive control with servomechanism based on inverse optimization with adaptive model matching - is applied to the muscle based on a high-precision mathematical model employing an asymmetric Bouc-Wen model. The experimental results show that the proposed approach achieves a high tracking performance at a reference frequency of 0.3 Hz, with a mean absolute error of 0.13 mm in the steady-state response. Furthermore, an easier controller tuning can be achieved. Additionally, the authors evaluate the contributions of the elements of the proposed method. The results show that the contribution of the adaptive system is higher than that of the servo system. Furthermore, the effectiveness of adaptive model matching is reconfirmed. © 2021, CC BY.

关键词： Model predictive control

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Frequency Measurement Research with Weight Averaging of Pulse Output Signal of Voltage-to-Frequency Converter

SSRN

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SSRN 2022年

作者： Dorozhovets, Mykhaylo Pawlowski, Eligiusz Świsulski, Dariusz Department of Metrology and Diagnostic Systems Faculty of Electrical and Computer Engineering Rzeszow University of Technology ul. Wincentego Pola 2A Rzeszów35-959 Poland Department of Information and Measuring Technology National University Lviv Polytechnic Lviv Ukraine Faculty of Electrical Engineering and Computer Science Lublin University of Technology Lublin Poland Faculty of Electrical and Control Engineering Gdańsk University of Technology Gdańsk Poland

The paper presents investigation of the efficiency of weight averaging of a pulse frequency modulated signal. The sampling effects and the interference influence in the input signal of the voltage-to frequency converter on the result of output frequency weight averaging are analyzed. A general form of the averaging result dependence on the used weighting function, signal value, interference level and modulation parameters is derived. In the case of high interferences whose frequencies are unstable or may change over a wide range, the specified level of their suppression, together with the reduction of the sampling effect, can be achieved using weighting functions, such as trigonometric, with an appropriate level of side lobes. The interference suppression dependently on frequency ranges using selected weighing functions are tested using both the simulation and experimental methods. The obtained results show very good convergence with the values calculated from theoretical formulas. © 2022, The Authors. All rights reserved.

关键词： Weighing

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Sequence-to-Sequence Voice Reconstruction for Silent Speech in a Tonal Language

arXiv

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arXiv 2021年

作者： Li, Huiyan Lin, Haohong Wang, You Wang, Hengyang Zhang, Ming Gao, Han Ai, Qing Luo, Zhiyuan Li, Guang The State Key Laboratory of Industrial Control Technology Institute of Cyber Systems and Control Zhejiang University Hangzhou310027 China Department of Computer Science Royal Holloway University of London Egham Hill Surrey EghamTW20 0EX United Kingdom

Silent Speech Decoding (SSD), based on articulatory neuromuscular activities, has become a prevalent task of Brain-Computer Interface (BCI) in recent years. Many works have been devoted to decoding surface electromyography (sEMG) from articulatory neuromuscular activities. However, restoring silent speech in tonal languages such as Mandarin Chinese is still difficult. This paper proposes an optimized Sequence-to-Sequence (Seq2Seq) approach to synthesize voice from the sEMG-based silent speech. We extract duration information to regulate the sEMG-based silent speech using the audio length. Then, we provide a deep-learning model with an encoderdecoder structure and a state-of-art vocoder to generate the audio waveform. Experiments based on six Mandarin Chinese speakers demonstrate that the proposed model can successfully decode silent speech in Mandarin Chinese and achieve a character error rate (CER) of 6.41% on average with human evaluation. Copyright © 2021, The Authors. All rights reserved.

关键词： Brain computer interface

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Chaos and fracture of a stiff thin film on a finite-thickness bi-layer substrate under an axial periodic load

Chaos and fracture of a stiff thin film on a finite-thicknes...

引用

第八届国际振动工程会议

作者： Haohao Bi Bo Wang Bohan Zhang Chao Xu Zichen Deng Department of Applied Mathematics Northwestern Polytechnical University Department of Engineering Mechanics Northwestern Polytechnical University Ministry of Industry and Information Technology Key Laboratory of Dynamics and Control of Complex Systems Northwestern Polytechnical University

To improve the robustness of the film-substrate type's stretchable electronics, an intermediate layer is introduced. However, due to the introducing of the intermediate layer between the film layer and the soft substrate layer to form tri-layer structure, the dynamic behaviour of this structure would be influenced. In this paper, the chaos and fracture of the tri-layer structure under an axial periodic load are investigated. Firstly, taking the shear stress between the film and the intermediate layer, and the deformation of the intermediate layer and the substrate layer into account, a more accurate analytical model has been established. Based on the Lagrange equation, the governing equation of the tri-layer structure has been derived. Then, the symplectic Runge-Kutta method is used to solve the corresponding equation. Numerical examples are performed to discuss the influences of the Young's modulus and thickness of the intermediate layer on the chaos and fracture of the tri-layer structure. These obtained results would be helpful for the design of higher reliability of the film/substrate-type stretchable electronics.

关键词： Chaos and fracture of a stiff thin film on a finite-thickness bi-layer substrate under an axial periodic load

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