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arXiv 2017年

作者： Tuan, H.T. Czornik, Adam Nieto, Juan J. Niezabitowski, Michal Institute of Mathematics Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Ha Noi10307 Viet Nam Silesian University of Technology Faculty of Automatic Control Electronics and Computer Science Akademicka 16 Gliwice44-100 Poland Departamento de Estatística Análise Matemática e Optimización Facultade de Matemáticas Universidade de Santiago de Compostela Santiago de Compostela15782 Spain Silesian University of Technology Faculty of Automatic Control Electronics and Computer Science Akademicka 16 Gliwice44-100 Poland

In this paper, we present some results for existence of global solutions and attractivity for mulidimensional fractional differential equations involving Riemann-Liouville derivative. First, by using a Bielecki type norm and Banach fixed point theorem, we prove a Picard-Lindelöf type theorem on the existence and uniqueness of solutions. Then, applying the properties of Mittag-Leffler functions, we describe the attractivity of solutions to some classes of Riemann-Liouville linear fractional differential systems.34A08, 34A12, 34A30, 34D05 Copyright © 2017, The Authors. All rights reserved.

关键词： Fixed point arithmetic

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Nonlinear control systems - A brief overview of historical and recent advances

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Nonlinear Engineering 2017年第4期6卷 301-312页

作者： Iqbal, Jamshed Ullah, Mukhtar Khan, Said Ghani Khelifa, Baizid Ćuković, Saša Department of Electrical Engineering FAST National University of Computer and Emerging Sciences Islamabad Pakistan Department of Electrical Engineering MY University Islamabad Pakistan Department of Mechanical Engineering College of Engineering Yanbu Taibah University Saudi Arabia Department of Computer Science and Automatic Control Mines-Telecom Institute France Faculty of Engineering University of Kragujevac Kragujevac Serbia

Last five decades witnessed remarkable developments in linear control systems and thus problems in this subject has been largely resolved. The scope of the present paper is beyond linear solutions. Modern technology demands sophisticated control laws to meet stringent design specifications thus highlighting the increasingly conspicuous position of nonlinear control systems, which is the topic of this paper. Historical role of analytical concepts in analysis and design of nonlinear control systems is briefly outlined. Recent advancements in these systems from applications perspective are examined with critical comments on associated challenges. It is anticipated that wider dissemination of this comprehensive review will stimulate more collaborations among the research community and contribute to further developments.

关键词： Linear control systems

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Blogcrawl: Customized crawling of online communities

UPB Scientific Bulletin, Series C: Electrical Engineering an...

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UPB Scientific Bulletin, Series C: Electrical Engineering and computer science 2017年第2期79卷 3-14页

作者： Stavarache, Lucia Larise Balint, Mihaela Dascalu, Mihai Trausan-Matu, Stefan Nistor, Nicolae Dept. of Computer Science University Politehnica of Bucharest Romania Faculty of Automatic Control and Computers University Politehnica of Bucharest Research Institute for Artificial Intelligence of the Romanian Academy Academy of Romanian Scientists Romania Ludwig-Maximilians-Universität München Germany Walden University United States

With half of the world already connected to the Internet, we are facing a growing amount of information available online, that is expected to increase exponentially in the following years. Educational environments are transitioning from closed structures to open, collaborative environments, using technology to build virtual classrooms. In this paper we present a customized crawler dedicated to alternative knowledge building environments used for potential community inquiry, that is unique in its power to combine data extraction and indexing capabilities that facilitate discourse-driven community network analysis integrated into the ReaderBench framework.

关键词： computer aided instruction

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Is the Symbiotic Recurrent Nova T CrB Late? Recent Photometric Evolution and Comparison with Past Pre-Outburst Behaviour

arXiv

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arXiv 2025年

作者： Merc, Jaroslav Wyrzykowski, Lukasz Beck, Paul G. Mikolajczyk, Przemyslaw J. Kotysz, Krzysztof Zieliński, Pawel Zola, Staszek Kurowski, Sebastian Ogloza, Waldemar Drozdz, Marek Galdies, Charles Hambsch, Franz-Josef Brincat, Stephen M. Joachimczyk, Barbara Bronikowski, Mateusz Japelj, Jure Mihelcic, Matej Carrasco, Josep Manel Burgaz, Umut Gurgul, Agnieszka Bąkowska, Karolina Hofbauer, Piotr Szyszka, Krzysztof Golonka, Jan Qvam, Jan Kåre Trandem Zdanavičius, Justas Pakštienė, Erika Maskoliūnas, Marius Čepas, Vytautas Pylypenko, Uliana Moździerski, Dawid Dubois, Franky Vanaverbeke, Siegfried Olszewska, Justyna M. Liakos, Alexios Stojanović, Milan Damljanović, Goran Popowicz, Adam Marzec, Mateusz Badura, Magdalena Gil, Bartosz Pucek, Alicja Kowalska, Aleksandra Szklarz, Mateusz Kvernadze, Teimuraz Reguitti, Andrea Awiphan, Supachai Dennefeld, Michel Gazeas, Kosmas Astronomical Institute of Charles University V Holešovičkách 2 Prague18000 Czech Republic Instituto de Astrofísica de Canarias La Laguna Calle Vía Láctea s/n TenerifeE-38205 Spain Astronomical Observatory University of Warsaw Al. Ujazdowskie 4 Warsaw00-478 Poland Astrophysics Division National Centre for Nuclear Research Pasteura 7 Warsaw02-093 Poland Departamento de Astrofísica Universidad de La Laguna Tenerife La LagunaE-38206 Spain Astronomical Institute University of Wroclaw ul. Mikolaja Kopernika 11 Wroclaw51-622 Poland Institute of Astronomy Faculty of Physics Astronomy and Informatics Nicolaus Copernicus University in Toruń Grudziądzka 5 Toruń87-100 Poland Astronomical Observatory Jagiellonian University ul. Orla 171 Kraków30-244 Poland Mt. Suhora Astronomical Observatory University of the National Education Commission ul. Podchorążych 2 Kraków30-084 Poland Institute of Earth Systems University of Malta MSD Msida2080 Malta Znith Astronomy Observatory Malta Zeeweg 96 BruggeB-8200 Belgium Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne Munsterdamm 90 BerlinD-12169 Germany Flarestar Observatory Fl.5 Ent.B Silver Jubilee Apt George Tayar Street San GwannSGN 3160 Malta Center for Astrophysics and Cosmology University of Nova Gorica Vipavska 11c Ajdovščina5270 Slovenia Astronomska revija Spika Koprska ulica 94 Ljubljana1000 Slovenia Martí i Franquès 1 BarcelonaE-08028 Spain Martí i Franquès 1 BarcelonaE-08028 Spain Edifici RDIT Campus PMT-UPC Esteve Terradas 1 Castelldefels Barcelona08860 Spain School of Physics Trinity College Dublin College Green Dublin 2 Ireland Horten Videregaende Skole Strandpromenaden 33 Horten3183 Norway Institute of Theoretical Physics and Astronomy Vilnius University Saulėtekio al. 3 Vilnius10257 Lithuania Public Observatory Astrolab IRIS Verbrandemolenstraat 5 Zillebeke8901 Belgium Astronomical Observatory Institute Faculty of Physics and Astronomy Adam Mickiew

T CrB is a symbiotic recurrent nova that last erupted in 1946. Given its recurrence timescale of approximately 80 years, the next outburst is eagerly anticipated by the astronomical community. In this work, we analyse the optical light curves of T CrB, comparing recent photometric evolution with historical data to evaluate potential predictive indicators of nova eruptions. Although the "super-active" phases preceding both the 1946 and anticipated eruptions are strikingly similar, the subsequent photometric behaviour differs. We find that the decline in brightness observed in 2023, interpreted by some as a "pre-eruption dip", deviates from the deep minimum recorded prior to the 1946 event and does not reliably predict the eruption timing. Recent photometric and spectroscopic observations indicate that the system is returning to a high-accretion state. Given this, an eruption may be imminent, even without distinct precursors. While the next eruption of T CrB will be a major scientific event, its expected peak brightness of V ∼ 2 mag highlights the importance of setting realistic public expectations for what will be a visually modest, yet astrophysically very significant, celestial event. Copyright © 2025, The Authors. All rights reserved.

关键词： Photometry

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On the Lyapunov exponents of infinite-dimensional discrete time-varying linear system

On the Lyapunov exponents of infinite-dimensional discrete t...

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International Conference on Methods and Models in Automation and Robotics (MMAR)

作者： Adam Czornik Piotr Jurgaś Faculty of Automatic Control Electronics and Computer Science Gliwice Poland

In this paper we consider infinite-dimensional discrete time-varying linear systems with coefficients in fixed set of invertible operators and we describe the set of all possible Lyapunov exponents of the system. We show that the set includes an interval bounded by the generalized spectral subradius and the generalized spectral radius.

关键词： Time-varying systems Linear systems Linear algebra Stability analysis computer science Conferences

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Application of hand detection algorithm in robot control

Application of hand detection algorithm in robot control

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International Carpathian control Conference (ICCC)

作者： Tomasz Grzejszczak Adrian Łegowski Michał Niezabitowski Faculty of Automatic Control Electronics and Computer Science Gliwice Poland

The topic of this paper concerns a way of robotic manipulator control with use of hand gestures. The previously developed hand landmarks detection and localization algorithm is now translated to work with robotic arm manipulator. The proposed algorithm is used for hand gesture recognition and continuous feature points tracking. The points coordinates and their detected paths are transformed into set of orientation and location values in order to achieve proper motion of manipulator. The article presents the way of implementation of hand landmarks tracking algorithm and implementation of robot arm manipulator control algorithm. The main emphasis is laid on the critical problems encountered during the implementation of those two algorithms and the problem of translation of the detection coordinate system into robot task space.

关键词： Manipulators Robot kinematics Cameras Detection algorithms Feature extraction Machine vision

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Heat distribution in the deep drawing device components working by high temperatures

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IOP Conference Series: Materials science and Engineering 2018年第1期393卷

作者： M Tropp F Brumerčík J Šteininger P Weis A Glowacz Univerzity of Žilina Faculty of Mechanical Engineering Department of Design and Mechanical Elements Univerzitná 1 Žilina 010 26 Slovakia AGHUniversity of Science and Technology Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Department of Automatic Control and Robotics Al. A. Mickiewicza 30 30-059 Kraków Poland

The subject of the article is a simulation of heat affected components of a device for deep drawing by extreme conditions in vacuum by high temperatures required for forming of crystallization containers made from thin molybdenum sheets. The simulation is focused on the distribution of heat in particular components in relation with their shape. There are presented the design of working components and the boundary conditions of transient thermal simulations with the results.

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Construction of laboratory stand and regulation in ABS car system

Construction of laboratory stand and regulation in ABS car s...

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International Carpathian control Conference (ICCC)

作者： Roman Czyba Michał Niezabitowski Szymon Sikora Faculty of Automatic Control Electronics and Computer Science Gliwice Poland

The main aim of this project was to design and construct the laboratory setup to perform testing of the ABS car systems. In this paper a realistic car brake system for a one wheel with suspension is used. Development and implementation of ABS architecture for integrated real-time, embedded control software is described. At the same time, it includes an exploratory study of ABS dynamics model, monitor and sensor system, etc. The architecture design of ABS control system at the graphical programming level is then established. In addition, it provides the rapid prototyping design in ABS car system based on MPC Target and has a strong engineering application value. We emphasize the design methodology of the control system supported by rapid prototyping in Hardware in the Loop structure.

关键词： Wheels Brakes Shafts Vehicles Mathematical model Roads

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IEC 61131-3 compliant PLC structure based on FPGA multi-core solution

IEC 61131-3 compliant PLC structure based on FPGA multi-core...

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International Conference on Signals and Electronic Systems, ICSES

作者： Piotr Chodorowski Mirosław Chmiel Faculty of Automatic Control Electronics and Computer Science Institute of Electronics

The paper discusses the design process of a full programmable logic controller implemented by means of FPGA device. The PLC is compliant with EN 61131-3 standard. It is equipped with a programmer that allows to transfer a program to the program memory of the controller, and the I/O controller which allows the exchange of information with the outside world, i.e. the signal modules. Some interesting aspects of instruction list and hardware architecture designing are presented, e.g. the PLC structure with a particular emphasis on central processing unit and memory map. The PLC is developed using one FPGA device as a combination of dedicated logic and soft-processor based parts. This gives an opportunity to develop interesting solutions. For example, using dual port RAM gives an opportunity to implement bit/word access without the necessity of masking bits. The paper presents a short description of a designed and written simple integrated development environment.

关键词： Clocks Radiation detectors Process control Random access memory Field programmable gate arrays Standards Hardware

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A scalable document-based architecture for text analysis 12th

A scalable document-based architecture for text analysis

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12th International Conference on Advanced Data Mining and Applications, ADMA 2016

作者： Truică, Ciprian-Octavian Darmont, Jérôme Velcin, Julien Computer Science and Engineering Department Faculty of Automatic Control and Computers University Politehnica of Bucharest Bucharest Romania Univ Lyon Lumière ERIC EA Lyon3083 France

ISBN: (纸本)9783319495859

sAnalyzing textual data is a very challenging task because of the huge volume of data generated daily. Fundamental issues in text analysis include the lack of structure in document datasets, the need for various preprocessing steps and performance and scaling issues. Existing text analysis architectures partly solve these issues, providing restrictive data schemas, addressing only one aspect of text preprocessing and focusing on one single task when dealing with performance optimization. Thus, we propose in this paper a new generic text analysis architecture, where document structure is flexible, many preprocessing techniques are integrated and textual datasets are indexed for efficient access. We implement our conceptual architecture using both a relational and a document-oriented database. Our experiments demonstrate the feasibility of our approach and the superiority of the document-oriented logical and physical implementation. © Springer International Publishing AG 2016.

关键词： Architecture

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