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IEEE International Conference on Smart Grid Communications (SmartGridComm)

作者： Atul Bohara Jordi Ros-Giralt Ghada Elbez Alfonso Valdes Klara Nahrstedt William H. Sanders Information Trust Institute University of Illinois at Urbana-Champaign Reservoir Labs Institute of Automation and Applied Informatics Karlsruhe Institute of Technology

ISBN: (数字)9781728161273

ISBN: (纸本)9781728163598

Devices in IEC 61850 substations use the generic object-oriented substation events (GOOSE) protocol to exchange protection-related events. Because of its lack of authentication and encryption, GOOSE is vulnerable to man-in-the-middle attacks. An adversary with access to the substation network can inject carefully crafted messages to impact the grid's availability. One of the most common such attacks, GOOSE-based poisoning, modifies the StNum and SqNum fields in the protocol data unit to take over GOOSE publications. We present ED4GAP, a network- level system for efficient detection of the poisoning attacks. We define a finite state machine model for network communication concerning the attacks. Guided by the model, ED4GAP analyzes network traffic out-of-band and detects attacks in real-time. We implement a prototype of the system and evaluate its detection accuracy. We provide a systematic approach to assessing bottlenecks, improving performance, and demonstrating that ED4GAP has low overhead and meets GOOSE's timing constraints.

关键词： Substations Protocols Relays IEC Standards Security Real-time systems Ethernet

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Local versus global stability in dynamical systems with consecutive Hopf bifurcations

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Physical Review Research 2023年第3期5卷 033139-033139页

作者： Philipp C. Böttcher Benjamin Schäfer Stefan Kettemann Carsten Agert Dirk Witthaut Institute of Energy and Climate Research Systems Analysis and Technology Evaluation (IEK-STE) Forschungszentrum Jülich 52428 Jülich Germany Institute of Energy and Climate Research Energy Systems Engineering (IEK-10) Forschungszentrum Jülich 52428 Jülich Germany Institute for Automation and Applied Informatics (IAI) Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany School of Computer Science & Engineering Constructor University Campus Ring 1 28759 Bremen Germany DLR Institute of Networked Energy Systems Carl-von-Ossietsky Straße 15 26129 Oldenburg Germany Institute for Theoretical Physics University of Cologne Zülpicher Straße 77 50937 Cologne Germany

Quantifying the stability of an equilibrium is central in the theory of dynamical systems as well as in engineering and control. A comprehensive picture must include the response to both small and large perturbations, leading to the concepts of local (linear) and global stability. Here, we show how systems displaying Hopf bifurcations show contrarian results for these two aspects of stability: Global stability is large close to the point where the system loses its stability altogether. We demonstrate this effect for an elementary model system, an anharmonic oscillator, and a realistic model of power system dynamics with delayed control. Detailed investigations of the bifurcation explain the seeming paradox in terms of the location of the attractors relative to the equilibrium.

关键词： Bifurcations Coupled oscillators Synchronization Dynamical systems Nonlinear time-delay systems Bifurcation analysis

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Design and Implementation of Adaptive NMPC in industrial applications: case study

Design and Implementation of Adaptive NMPC in industrial app...

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International Carpathian Control Conference (ICCC)

作者： Stepan Ozana Filip Krupa Jakub Nemcik Gergely Takacs Jakub Mozaryn Petr Beremlijski Abhaya Singh Aleksandra Kawala-Sterniuk Department of Cybernetics and Biomedical Engineering VSB-Technical University of Ostrava Ostrava Czech Republic Institute of Automation Measurement and Applied Informatics Slovak University of Technology in Bratislava Bratislava Slovak Republic Institute of Automatic Control and Robotics Warsaw University of Technology Warsaw Poland Department of Applied Mathematics VSB-Technical University of Ostrava Ostrava Czech Republic Department of engineering University of Sannio Sannio Italy Department of Electrical Power and Renewable Energy Opole University of Technology Opole Poland

This paper deals with the design and implementation of adaptive nonlinear predictive control (NMPC). The resulting control system is deployed on a softPLC embedded target in real-time via the REXYGEN control system. The paper describes functional prototype using softPLC hosting the NMPC algorithm applied for a nonlinear system consisting of three coupled tanks. The NMPC algorithm is solved via the receding horizon control method (RHC), formulated as a nonlinear programming problem (NLP) and numerically computed using the SOLNP solver. The adaptivity is provided by online identification via moving horizon estimation (MHE), keeping the model updated to avoid a model-plant mismatch. The methodology described in this paper can be easily transferred to a wider group of industrial nonlinear processes. Such created control unit can run in a standalone mode or can be connected to some exiting control system providing a necessary computational power and thus upgrading the quality of control significantly.

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Directed Evolution of Human Facial Images

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IFAC-PapersOnLine 2020年第2期53卷 16518-16523页

作者： Barbora Zahradnikova Roman Budjac Peter Schreiber Stefan Rydzi Institute of Applied Informatics Automation and Mechatronics Faculty of Materials Science and Technology Slovak University of Technology J. Bottu 25 91701 Trnava Slovakia

In a criminal investigation, situations are quite often where no evidence but a witness is available. In these cases, facial composite is a tool applied in search for a perpetrator of a crime. Facial composites are images of faces drafted by a forensic technician requiring a precise description provided by a witness. Despites deploying the computational technique into the process, the naming rates remain very low (not reaching 5%). In this paper, we present a system developed according to the latest research on facial perception. Incorporating the interactive evolutionary algorithm, whole face images are automatically generated based on the witness’s selection. The system is presented in the latest tested version, providing information on the selected EA as well as several image manipulation algorithms inclusive of method for age progression and hair manipulation. Besides describing applied methods and in-office testing, testing in simulated field conditions is part of the paper.

关键词： facial composite system evolutionary algorithm face perception forensic system

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The role of interpretable patterns in deep learning for morphology

arXiv

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arXiv 2020年

作者： Ács, Judit Kornai, András Department of Automation and Applied Informatics Budapest University of Technology and Economics Hungary Institute for Computer Science and Control Hungary

We examine the role of character patterns in three tasks: morphological analysis, lemmatization and copy. We use a modified version of the standard sequence-to-sequence model, where the encoder is a pattern matching network. Each pattern scores all possible N character long subwords (substrings) on the source side, and the highest scoring subword’s score is used to initialize the decoder as well as the input to the attention mechanism. This method allows learning which subwords of the input are important for generating the output. By training the models on the same source but different target, we can compare what subwords are important for different tasks and how they relate to each other. We define a similarity metric, a generalized form of the Jaccard similarity, and assign a similarity score to each pair of the three tasks that work on the same source but may differ in target. We examine how these three tasks are related to each other in 12 languages. Our code is publicly available. © 2020, CC BY-SA.

关键词： Pattern matching

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Simultaneous localization and mapping on a mobile robot platform

Simultaneous localization and mapping on a mobile robot plat...

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IEEE International Symposium on Measurement and Control in Robotics (ISMCR)

作者： Martin Lučan František Duchoň Martin Gulan Institute of Robotics and Cybernetics FEI STU in Bratislava Slovakia Institute of automation measurement and applied informatics FME STU in Bratislava Slovakia

ISBN: (数字)9781665404792

ISBN: (纸本)9781665404808

Simultaneous localization and mapping (SLAM) is a very current problem in robotics, and the development of new SLAM algorithms is carried out by leading research institutions. The text presents the implementation of selected SLAM algorithms on a custom made hardware platform built on the chassis of the 1:10 remote control Ackerman vehicle model. A transformation of a hobby vehicle platform to an autonomous robot requires hardware and software intervention the paper further describes a sensor setup, hardware configuration, and briefly apprises of the software architecture. Finally, the characteristics and performance of GMapping with wheel odometry and visual odometry, Hector SLAM, and CRSM SLAM algorithms are evaluated in a series of practical experiments.

关键词： Continuous wavelet transforms C# languages 6G mobile communication

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MagnetoShield: Prototype of a Low-Cost Magnetic Levitation Device for Control Education

MagnetoShield: Prototype of a Low-Cost Magnetic Levitation D...

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IEEE Education Engineering (EDUCON)

作者： Gergely Takács Jakub Mihalík Erik Mikuláš Martin Gulan Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology in Bratislava Bratislava Slovakia

ISBN: (数字)9781728109305

ISBN: (纸本)9781728109312

This article presents a prototype reference design for a low-cost miniature magnetic levitation experiment. The proposed device is built as an Arduino expansion module, thus may be installed on a broad range of microcontroller prototyping boards. The open-source hardware design uses off-the-shelf and widely available components and 3D printing technology, thus its overall material cost is minimal. This way, the magnetic levitation experiment is transformed into a pocket laboratory that can be borrowed by students for take-home experiments. In addition to the device itself, we present an open-source application programming interface and the outline of classroom examples in modeling, system identification and closed-loop control.

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Evaluating Ensemble Post-Processing for Wind Power Forecasts

arXiv

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arXiv 2020年

作者： Phipps, Kaleb Lerch, Sebastian Andersson, Maria Mikut, Ralf Hagenmeyer, Veit Ludwig, Nicole Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Germany Department of Economics Karlsruhe Institute of Technology Germany Department of Management and Engineering Division of Energy Systems Linköping University Sweden Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Germany Excellence Machine Learning University of Tübingen Germany

Capturing the uncertainty in probabilistic wind power forecasts is challenging, especially when uncertain input variables, such as the weather, play a role. Since ensemble weather predictions aim to capture the uncertainty in the weather system, they can be used to propagate this uncertainty through to subsequent wind power forecasting models. However, as weather ensemble systems are known to be biased and underdispersed, meteorologists post-process the ensembles. This postprocessing can successfully correct the biases in the weather variables but has not been evaluated thoroughly in the context of subsequent forecasts, such as wind power generation forecasts. Copyright © 2020, The Authors. All rights reserved.

关键词： Electric power generation

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Fog Oriented Model for Data Collection in the Networks of Mobile Devices 10

Fog Oriented Model for Data Collection in the Networks of Mo...

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10th IEEE International Conference on Intelligent Systems, IS 2020

作者： Vodyaho, Alexander Yoshinov, Radoslav Zhukova, Nataly Thaw, Aung Myo Saddam Ahmed, Abbas St. Petersburg State Electrotechnical University St. Petersburg Russia Bulgarian Academy of Sciences Educational Telematics Sofia Bulgaria Russian Academy of Sciences St. Petersburg Institute for Informatics and Automation St. Petersburg Russia ITMO University Department of Informatics and Applied Mathematics St. Petersburg Russia

ISBN: (纸本)9781728154565

In the current state of IoT systems development, the fog techniques become the key solution of latency and energy consumption reducing when collecting and processing end user data. Instead of processing and storing data in the cloud, the fog technique extends the responsibility of cloud nearer to the end user and it allows improve QoS and decrease communication cost. In this paper a fog-oriented data collection model which uses processing functions in the fog layer is presented. Moreover, the responsibilities of cloud service and fog data processing are defined for deferent smart application. © 2020 IEEE.

关键词： Energy utilization

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Explicit spline-based continuous-time MPC: a study on design and performance

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IFAC-PapersOnLine 2020年第2期53卷 7013-7019页

作者： Boris Rohaľ-Ilkiv Martin Gulan Peter Minarčík Institute of Automation Measurement and Applied Informatics Faculty of Mechanical engineering Slovak University of Technology in Bratislava Námestie slobody 17 812 31 Bratislava Slovakia

This paper presents a continuous-time model predictive control scheme based on B-spline functions used for signals and model approximation. The proposed controller offers two interesting advantages. First, it formulates the control signal as a continuous polynomial spline function, the nature of which is determined by its control polygon that is subject of optimization. Second, all continuous constraints assumed over prediction horizon are consistently transformed into constraints imposed on a finite number of elements of this control polygon. Using parametric quadratic programming we further show how to obtain an explicit representation of the proposed controller, which is known for its efficient online implementation. The featured simulation study demonstrates that by a suitable choice of number and position of knots of the spline function over the prediction horizon it is possible to substantially reduce the number of critical regions of the explicit controller while preserving control performance, and to mitigate the direct correlation between number of regions and chosen length of prediction horizon.

关键词： explicit model predictive control parametric programming linear systems B-spline functions continuous-time control efficient implementation

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