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19th Annual Conference on Towards Autonomous Robotic Systems, TAROS 2018

作者： Ghiţă, Ştefania Alexandra Barbu, Miruna-Ştafania Gavril, Alexandru Trăscău, Mihai Sorici, Alexandru Florea, Adina Magda Faculty of Automatic Control and Computer Science Politehnica University of Bucharest Bucharest Romania

ISBN: (纸本)9783319967271

The field of assistive robotics is gaining traction in both research as well as industry communities. However, capabilities of existing robotic platforms still require improvements in order to implement meaningful human-robot interactions. We report on the design and implementation of an external system that significantly augments the person detection, tracking and identification capabilities of the Pepper robot. We perform a qualitative analysis of the improvements achieved by each system module under different interaction conditions and evaluate the whole system on hand of a scenario for elderly care assistance. © Springer International Publishing AG, part of Springer Nature 2018.

关键词： Face recognition

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New results on estimation bandwidth adaptation

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IFAC-PapersOnLine 2018年第15期51卷 933-938页

作者： Niedwiecki, Maciej Ciolek, Marcin Faculty of Electronics Telecommunications and Computer Science Department of Automatic Control Gdask University of Technology ul. Narutowicza 11/12 Gdask Poland

The problem of identification of a nonstationary autoregressive signal using non-causal estimation schemes is considered. Noncausal estimators can be used in applications that are not time-critical, i.e., do not require real-time processing. A new adaptive estimation bandwidth selection rule based on evaluation of pseudoprediction errors is proposed, allowing one to adjust tracking characteristics of noncausal estimators to unknown and/or time-varying degree of signal nonstationary. The new rule is compared with the previously proposed one, based on the generalized Akaike's final prediction error criterion. © 2018

关键词： Bandwidth Adaptive estimation Autoregressive signals Bandwidth adaptation Bandwidth selections Final prediction error criterion Non causal estimations Nonstationary Realtime processing

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Small-gain theorem for stability, cooperative control and distributed observation of infinite networks

arXiv

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arXiv 2020年

作者： Noroozi, Navid Mironchenko, Andrii Kawan, Christoph Zamani, Majid Otto-von-Guericke University Magdeburg Laboratory for Systems Theory and Automatic Control Magdeburg Germany Faculty of Computer Science and Mathematics University of Passau Passau94032 Germany Institute of Informatics Ludwig Maximilian University of Munich Germany Computer Science Department University of Colorado BoulderCO80309 United States Computer Science Department Ludwig Maximilian University of Munich Germany

Motivated by a paradigm shift towards a hyper-connected world, we develop a computationally tractable small-gain theorem for a network of infinitely many systems, termed as infinite networks. The proposed small-gain theorem addresses exponential input-to-state stability with respect to closed sets, which enables us to analyze diverse stability problems in a unified manner. The small-gain condition, expressed in terms of the spectral radius of a gain operator collecting all the information about the internal Lyapunov gains, can be numerically computed for a large class of systems in an efficient way. To demonstrate broad applicability of our small-gain theorem, we apply it to the stability analysis of infinite time-varying networks, to consensus in infinite-agent systems, as well as to the design of distributed observers for infinite networks. Copyright © 2020, The Authors. All rights reserved.

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3D Smith chart constant quality factor semicircles contours for positive and negative resistance circuits

arXiv

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arXiv 2020年

作者： Asavei, Victor Muller, Andrei A. Sanabria-Codesal, Esther Moldoveanu, Alin Ionescu, Adrian M. Department of Computer Science and Engineering Faculty of Automatic Control and Computers University Politehnica of Bucharest Bucharest060042 Romania Lausanne1015 Switzerland Departamento de Matemática Aplicada Universitat Politècnica de València Valencia Spain

The article proves first that the constant quality factor (Q) contours for passive circuits, while represented on a 2D Smith chart, form circle arcs on a coaxal circle family. Furthermore, these circle arcs represent semi-circles families in the north hemisphere while represented on a 3D Smith chart. On the contrary we show that the constant Q contours for active circuits with negative resistance form complementary circle arcs on the same family of coaxal circles in the exterior of the 2D Smith chart. Also, we find out that these constant Q contours represent complementary semi-circles in the south hemisphere while represented on the 3D Smith chart for negative resistance circuits. The constant Q - computer aided design (CAD) implementation of the Q semi-circles on the 3D Smith chart is then successfully used to evaluate the quality factor variations of newly fabricated Vanadium dioxide inductors first, directly from their reflection coefficient, as the temperature is increased from room temperature to 50 degrees Celsius (°C). Thus, a direct multi-parameter frequency dependent analysis is proposed including Q, inductance and reflection coefficient for inductors. Then, quality factor direct analysis is used for two tunnel diode small signal equivalent circuits analysis, allowing for the first time the Q and input impedance direct analysis on Smith chart representation of a circuit, including negative resistance. Copyright © 2020, The Authors. All rights reserved.

关键词： Timing circuits

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On the assignability of regularity coefficients and central exponents of discrete linear time-varying systems

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IFAC-PapersOnLine 2019年第28期52卷 64-69页

作者： Artur Babiarz Adam Czornik Michał Niezabitowski Silesian University of Technology Faculty of Automatic Control Electronics and Computer Science Institute of Automatic Control Akademicka 16 Street 44-100 Gliwice Poland University of Silesia Faculty of Mathematics Physics and Chemistry Institute of Mathematics Bankowa 14 40-007 Katowice Poland

In this paper we investigate the problem of assignability of the so-called regularity coefficients and central exponents of discrete linear time-varying systems. The main result presents a possibility of assignability of Lyapunov, Perron, Grobman regularity coefficients and central exponents by a linear time-varying feedback under the assumptions of uniform complete controllability.

关键词： discrete linear time-varying systems regularity coefficients central exponents

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Defect engineering approaches for metal oxide semiconductor-based chemiresistive gas sensing

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Coordination Chemistry Reviews 2025年 541卷

作者： Kumar, Amit Mazumder, Julaiba Tahsina Joyen, Kenza Favier, Frédéric Mirzaei, Ali Kim, Jin-Young Kwoka, Monika Bechelany, Mikhael Jha, Ravindra Kumar Kumar, Mahesh Kim, Hyoun Woo Kim, Sang Sub Department of Electrical Engineering Indian Institute of Technology Jodhpur Jodhpur 342030 India Department of Electronics Assam Skill University Assam Mangaldai 784125 India European Institut of Membranes (IEM) – UMR 5635 University of Montpellier ENSCM CNRS Montpellier 34090 France Institut Charles Gerhardt Montpellier (ICGM) – UMR 5253 University of Montpellier ENSCM CNRS Montpellier 34090 France Department of Materials Science and Engineering Shiraz University of Technology Shiraz 715557-13876 Iran Customized manufacturing R&D department Korea Institute of Industrial Technology Gyeonggi-do 15014 South Korea Department of Cybernetics Nanotechnology and Data Processing Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Akademicka 16 Gliwice 44-100 Poland Functional Materials Group Gulf University for Science and Technology (GUST) Mubarak Al-Abdullah 32093 Kuwait Department of Electronics and Electrical Engineering & Centre for Intelligent Cyber-Physical Systems Indian Institute of Technology Guwahati Guwahati 781039 India Division of Materials Science and Engineering Hanyang University Seoul 04763 South Korea Department of Materials Science and Engineering Inha University Incheon 22212 South Korea

Defect engineering in metal oxides presents a promising approach for tailoring material properties. This strategy enhances gas sorption, catalysis, and control over key physical characteristics such as bandgap, magnetic behavior, and electrical conductivity. Despite its potential, the role of defect engineering in advancing metal oxide semiconductor (MOS) gas-sensing performance remains underexplored. This review introduces defect engineering strategies, emphasizing their applications in gas sensing. Gas sensors play a vital role in environmental monitoring, industrial safety, healthcare, and in improving energy efficiency. The demand for advanced gas sensors has never been more critical, given the need for real-time, accurate, and cost-effective detection of pollutant gases. MOS-based gas sensors are widely used in air quality monitoring, industrial safety, and health diagnostics. Vacancies and defect architectures in MOS have been widely studied for their role in sensing performance, as they fundamentally influence sensor efficiency. The effectiveness of MOS sensors largely depends on the type and concentration of defects. This review introduces vacancies and defects in MOS, followed by an in-depth discussion of defect types, factors influencing defect formation, and their role in charge transport. Additionally, it examines the correlation between elemental chemical properties and defect chemistry. Special attention is given to the defect chemistry of metal oxides, including TiO₂, ZnO, Co₃O₄, ZrO₂, WO₃, and CeO₂. It concludes with an examination of surface engineering methods for defect control to improve gas-sensing capabilities. © 2024

关键词： Chemiresistive gas sensing Defect Engineering Metal-oxide semiconductor

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Forced variational integrator for distance-based shape control with flocking behavior of multi-agent systems ⁎

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IFAC-PapersOnLine 2020年第2期53卷 3348-3353页

作者： Leonardo Colombo Patricio Moreno Mengbin Ye Héctor Garcia de Marina Ming Cao Institute of Mathematical Sciences (ICMAT) Madrid Spain LAR-GPSIC Facultad de Ingeniería Universidad de Buenos Aires Argentina Optus-Curtin Centre of Excellence in Artificial Intelligence Curtin University Australia Faculty of Physics Department of Computer Architecture and Automatic Control Universidad Complutense de Madrid Madrid Spain Faculty of Science and Engineering ENTEG University of Groningen Netherlands

A multi-agent system designed to achieve distance-based shape control with flocking behavior can be seen as a mechanical system described by a Lagrangian function and subject to additional external forces. Forced variational integrators are given by the discretization of Lagrange-d’Alembert principle for systems subject to external forces, and have proved useful for numerical simulation studies of complex dynamical systems. We derive forced variational integrators that can be employed in the context of control algorithms for distance-based shape with velocity consensus. In particular, we provide an accurate numerical integrator with a lower computational cost than traditional solutions, while preserving the configuration space and symmetries. We also provide an explicit expression for the integration scheme in the case of an arbitrary number of agents with double integrator dynamics. For a numerical comparison of the performances, we use a planar formation consisting of three autonomous agents.

关键词： Shape control Distributed control Multi-agent systems Forced variational integrators

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Steady state analysis of switched reluctance motor with modified geometry of the stator designed for an electric bike

Steady state analysis of switched reluctance motor with modi...

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2018 International Symposium on Electrical Machines, SME 2018

作者： Gabor, Rafal Kowol, Marcin Kolodziej, Janusz Mynarek, Piotr Opole University of Technology Faculty of Electrical Engineering Automatic Control and Computer Science Opole Poland

ISBN: (纸本)9781538652107

The paper contains a proposition of the application of a SRM motor with a modified stator geometry for an electric drive, in particular in an electric bicycle. The study involved a comparison of the cyclicity of the electromagnetic torque and self-inductance in the function of the rotor angle in 2D and 3D models based on the application of the finite element method. © 2018 IEEE.

关键词： Finite element method

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LoRA based, low power remote monitoring and control solution for Industry 4.0 factories and facilities

LoRA based, low power remote monitoring and control solution...

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Roedunet International Conference (RoEduNet)

作者： George-Cristian Pătru Dumitru-Cristian Trancă Ciprian-Marian Costea Daniel Rosner Răzvan-Victor Rughiniş Computer Science and Engineering Department University POLITEHNICA of Bucharest Bucharest Romania Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Bucharest Romania

Over the years, industrial automation has repeatedly been impacted by the continuous and tremendous evolution in the fields of computer systems, electronics and data transmission. Industry 4.0, the current wave of the industrial revolution- dubbed the data revolution -, integrates these advances in communication and computational systems with the Internet, resulting in a paradigm shift towards the (Industrial) Internet of Things. Automation systems and remote data acquisition systems evolved over the last years from classic solutions based on wired infrastructure to modern, flexible solutions bringing together wireless communications, battery powered devices and wireless sensors networks. In this paper we first define the main problems encountered in modern wireless automation systems - small distance limitations of wireless communication solutions, weak security or complete lack of security in data transmission, and high energy consumption of battery powered remote data acquisition systems. In order to address these limitations, we propose, implement, trial-run and benchmark a novel low power LoRa-based flexible hardware architecture for use in industrial remote monitoring and control. We obtain a LoS capability above 3km and a calculated autonomy of about 10 years, exceeding the capabilities of current State of the Art solutions.

关键词： Sensors Hardware Batteries Wireless sensor networks Power demand Protocols Industries

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Eddy Current Method in Non-Magnetic Aluminide Coating Thickness Assessment

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Journal of Nondestructive Evaluation 2025年第3期44卷

作者： Tytko, Grzegorz Adamczyk-Habrajska, Malgorzata Li, Yong Pengpeng, Shi Kopec, Mateusz Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Gliwice44-100 Poland Faculty of Science and Technology University of Silesia Chorzów41-500 Poland State Key Laboratory for Strength and Vibration of Mechanical Structures Shaanxi Engineering Research Centre of NDT and Structural Integrity Evaluation Xi’an Jiaotong University Shaanxi Xi’an China School of Mathematics and Statistics Ningxia University Ningxia Yinchuan750021 China Institute of Fundamental Technological Research Polish Academy of Sciences Pawińskiego 5B Warsaw02-106 Poland

This study investigates the use of eddy current testing (ECT) as a non-destructive technique to evaluate the thickness and structural variations of non-magnetic aluminide coatings on MAR-M247 nickel-based superalloy. Coatings with thicknesses of 20 μm and 40 μm were applied to substrates exhibiting fine, coarse, and columnar grain structures. Using sensors of different geometries, impedance measurements were performed within a frequency range of 11.5 MHz to 12.5 MHz. Results demonstrated the designed sensor’s superior sensitivity, with the highest values of absolute resistance difference significantly exceeding the threshold for reliable distinction due to coating thicknesses or grain structures. The study highlights the impact of eddy current penetration depth and edge effects on the measurement accuracy, emphasizing the need for optimized sensor design and frequency selection. Findings confirm the efficacy of ECT in differentiating coatings of varying thicknesses and substrate structures, offering a reliable tool for quality control in high-temperature applications. © The Author(s) 2025.

关键词： Eddy current testing

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