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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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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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SCADA security: Concepts and recommendations 10th

SCADA security: Concepts and recommendations

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10th International Symposium on Cyberspace Safety and Security, CSS 2018

作者： Ionica, Dragos Pop, Florin Popescu, Nirvana Popescu, Decebal Dobre, Ciprian Faculty of Automatic Control and Computers Computer Science Department University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9783030016883

SCADA systems are the computers that control essential, complicated, and often dangerous physical processes, many of which constitute the physical infrastructure critical to modern societies. These physical processes are powerful tools, and their misuse generally has unacceptable consequences. Preventing such abuse is the goal of SCADA security. To understand misuse and how to avoid it, we need some understanding of what a SCADA system is, and how it works under different forms of attacks. These are the primary objectives of this paper. © Springer Nature Switzerland AG 2018.

关键词： SCADA systems

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Author Correction: H∞ observer-based control for fuzzy Hadamard fractional-order systems

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Computational and Applied Mathematics 2025年第5期44卷 1-1页

作者： Rhaima, Mohamed Gassara, Hamdi Mchiri, Lassaad Hajjaji, Ahmed El Makhlouf, Abdellatif Ben Department of Statistics and Operations Research College of Science King Saud University Riyadh Saudi Arabia Laboratory of Sciences Techniques of Automatic Control and Computer Engineering National School of Engineering of Sfax University of Sfax Sfax Tunisia Panthéon-Assas University Paris II Paris France Modeling Information and Systems Laboratory University of Picardie Jules Verne UFR of Sciences Amiens France Department of Mathematics Faculty of Sciences Sfax University Sfax Tunisia

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Productivity analysis and non-linear gain scheduling approach for multi-species bioprocesses with product inhibition

Productivity analysis and non-linear gain scheduling approac...

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IEEE Annual Conference on Decision and control

作者： Piotr Skupin Alain Rapaport Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Gliwice Poland MISTEA Univ Montpellier INRA France

ISBN: (数字)9781728113982

ISBN: (纸本)9781728113999

Bioprocesses with product inhibition are known to allow species coexistence. In this work, we first study the productivity of the different possible equilibria, depending on the operating conditions, and show that single species offers the best performances. Then, we propose a control strategy to stabilize the dynamics about the desired equilibria, in presence of instability. Based on output feedback linearization, we propose a family of controllers and a gain-scheduling approach to adapt the controller. Finally, we illustrate our approach on numerical simulations, showing that the attraction basin of the closed-loop system is improved by considering the gain-scheduling approach.

关键词： Productivity Silicon compounds Steady-state Mathematical model Stability analysis Closed loop systems Inhibitors

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Sensor and Communication Considerations in UAV-WSN Based System for Precision Agriculture

Sensor and Communication Considerations in UAV-WSN Based Sys...

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IEEE Conference on Cybernetics and Intelligent Systems

作者： Emilian Vlasceanu Marius Dima Dan Popescu Loretta Ichim AFT R&D Bucharest Romania Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Bucharest Romania

ISBN: (数字)9781728134581

ISBN: (纸本)9781728134598

The paper presents a hybrid UAV (Unmanned Aerial Vehicle) - WSN (Wireless Sensor Network) based system with application in a specific field: the precision agriculture. The main goal is to collect data from WSN via aerial platform. We propose a multi-agent system architecture (multi-UAVs, multi WSNs) and a specific implementation for the ground Wireless Sensors Network. The communication inside WSN is based on LoRa transmission protocol. The solution is a cheap one and the simulation results give the perspective of a large-scale utilization in agriculture. The experimental results were done on a two UAVs-two WSNs configuration which can be controlled and programed at distance via internet.

关键词： Wireless sensor networks Robot sensing systems Agriculture Base stations Unmanned aerial vehicles Protocols Temperature sensors

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How does bisphenol A damage cells? Studies on the freshwater shrimpNeocaridina davidi

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Bollettino di zoologia 2025年第1期92卷

作者： H. Gorol A. Ostróżka G. Wilczek Ł. Chajec S. Student A. Aleksa M. Rost-Roszkowska 1 Institute of Biology Biotechnology and Environmental Protection University of Silesia in Katowice Katowice Poland 2 Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Gliwice Poland3 Biotechnology Center Silesian University of Technology Gliwice Poland 1 Institute of Biology Biotechnology and Environmental Protection University of Silesia in Katowice Katowice Poland4 SPIN-Lab Centre for Microscopic Studies on Matter University of Silesia in Katowice Chorzów Poland

Bisphenol A (BPA) is an organic compound used in the production of numerous plastics, which poses a real threat to health and life. Although BPA is poorly soluble in water, its presence in marine and freshwater environments has been recorded at quite high levels. Numerous studies are being conducted on the impact of this xenobiotic on the population size, fertility, and reproduction of various animals. A freshwater shrimpNeocaridina davidi(Crustacea) originates from Asia and enjoys great interest among breeders and researchers studying the influence of various xenobiotics on the functioning of freshwater animals. Therefore, we selected this species to analyze the cytotoxicity of BPA and possible changes in cells leading to their protection. The study aimed to determine whether BPA only causes degenerative changes in the midgut epithelium of freshwater crustaceans or whether cell and tissue protection processes (e.g. stem cell proliferation) will be visible at the ultrastructural level. The most important goals were to establish whether the cytotoxicity of BPA is connected with its concentration and the period of animal exposure and whether it proceeds in the same manner in different organs. Thus, we used different concentrations of BPA, corresponding to its concentrations in different waters and different times of the animals’ breeding in a contaminated environment. Shrimps were exposed to three concentrations of BPA: 1, 5, and 10 mg/L for 24, 48, and 72 h. Two organs that form the midgut were isolated – the intestine and hepatopancreas. The results revealed that the concentration and exposure time of freshwater animals affect the functioning of stem cells. However, autophagy and lipid digestion play an important role in protecting cells against the effects of BPA, which is also related to the increased energy demand of cells. Further studies connected with cell death processes and antioxidative mechanisms are needed.

关键词： Bisphenol A midgut stem cells cycle cycle cytotoxicity

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