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2nd International Conference on Software and Data Technologies, ICSOFT 2007

作者： Kovári, Bence Horváth, Áron Kertész, Zsolt Illés, Csaba Department of Automation and Applied Informatics Budapest University of Technology and Economics Goldman György tér 3 Budapest Hungary Department of Control Engineering and Information Technology Budapest University of Technology and Economics Magyar Tudósok Körútja 2 Budapest Hungary

Stroke extraction is a necessary part of the majority of semantic based off-line signature verification systems. This paper discusses some stroke extraction variants which can be efficiently used in such environments. First the different aspects and problems of signature verification are discussed in conjunction with off-line analysis methods. It is shown, that on-line analysis methods perform usually better than off-line methods because they can make use of the temporal information (and thereby get a better perception of the semantics of the signature). To improve the accuracy of off-line signature verification methods the extraction of semantic information is necessary. Three different approaches are introduced to reconstruct the original strokes of a signature. One purely based on simple image processing algorithms, one with some more intelligent processing and one with a pen model. The methods are examined and compared with regard to their benefits and drawbacks on further signature processing.

关键词： Semantics

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Delay Systems with Meromorphic Functions Design

Delay Systems with Meromorphic Functions Design

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IEEE International Conference on control and automation

作者： Roman Prokop Jiri Korbel Libor Pekar Department of Mathematics Tomas Bata University in Zlin Faculty of Applied Informatics Department of Computer and Communication Systems Tomas Bata University in Zlin Faculty of Applied Informatics Department of Automation and Control Engineering Tomas Bata University in Zlin Faculty of Applied Informatics

ISBN: (纸本)9781509017393

The paper is focused on systems with delay terms at the left (and the right) side of differential equations. Analysis and synthesis of delay systems can be conveniently studied through a special ring of RQ-meromorphic functions. The control methodology is based on a solution of Diophantine equations in this ring. Final controllers result in the Smith predictor like structure. controller parameters are tuned through a pole-placement problem as a desired multiple root of the characteristic closed loop equation. The methodology is illustrated by a stable second order transfer function with a dead-time term. Then the paper brings an autotuning method as a combination of biased-relay feedback estimation and the proposed algebraic control design. The developed approach is illustrated by examples in the Matlab and Simulink environment.

关键词： Delay systems Rings Diophantine equation Autotuning Relay experiment

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From News to Summaries: Building a Hungarian Corpus for Extractive and Abstractive Summarization

arXiv

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arXiv 2024年

作者： Barta, Botond Lakatos, Dorina Nagy, Attila Nyist, Milán Konor Ács, Judit HUN-REN Institute for Computer Science and Control Department of Automation and Applied Informatics Budapest University of Technology and Economics Hungary

Training summarization models requires substantial amounts of training data. However for less resourceful languages like Hungarian, openly available models and datasets are notably scarce. To address this gap our paper introduces HunSum-2 an open-source Hungarian corpus suitable for training abstractive and extractive summarization models. The dataset is assembled from segments of the Common Crawl corpus undergoing thorough cleaning, preprocessing and deduplication. In addition to abstractive summarization we generate sentence-level labels for extractive summarization using sentence similarity. We train baseline models for both extractive and abstractive summarization using the collected dataset. To demonstrate the effectiveness of the trained models, we perform both quantitative and qualitative evaluation. Our dataset, models and code are publicly available, encouraging replication, further research, and real-world applications across various domains. © 2024, CC BY.

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Dynamics of DFIG controlled by Rotor Side Converter in wind energy

Dynamics of DFIG controlled by Rotor Side Converter in wind ...

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International Youth Conference on Energetics (IYCE)

作者： Péter Stumpf József Berei István Nagy István Vajk Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest MTA-BME Control Engineering Research Group

The paper is concern with the investigation of control of Doubly Fed Induction Generator (DFIG) carried out by Rotor Side Converter (RSC) applied in wind energy harvest. Throughout the paper the principle of Stator Flux Oriented Vector control (SFOVC) is applied. In the first part of the paper a general slip-torque relation is derived with three torque components: one component is derived by the stator voltage, the other one by the d component and the third one by the q component of the rotor voltage space vector. In the second part of the paper, the dynamic behavior of the algorithm controlling the stator active and reactive power is simulated in open loop and closed loop.

关键词： Rotors Torque Stators Turbines Mathematical model Microgrids Transient response

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Analysis of an on-line minimum-time velocity optimization algorithm

Analysis of an on-line minimum-time velocity optimization al...

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International Carpathian control Conference (ICCC)

作者： Gábor Csorvási István Vajk Department of Automation and Applied Informatics Budapest University of Technology and Economics MTA-BME Control Engineering Research Group Hungary

Examination of the control of a high-speed vehicle is essential to achieve autonomous navigation on high speed roads. Velocity profile generation is one of the challenging problems. In this paper we analyze the efficiency of an on-line velocity profiler algorithm. The presented method is based on a receding horizon implementation in which the vehicle executes part of the computed optimal trajectory, while simultaneously optimizing the path up to a new horizon. The search space at each optimization step is considerably reduced, which results in reduced computational cost. We present an analysis of the horizon length selection and the impact on the running times compared to the infinite-horizon solution.

关键词： Vehicles Optimization Force Trajectory Planning Acceleration controllability

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Design and Practical Application of Simple Robust controllers: A Parametric Approach

Design and Practical Application of Simple Robust Controller...

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IEEE Conference on control Technology and Applications (CCTA)

作者： Radek Matusu Roman Prokop Department of Automation and Control Engineering Faculty of Applied Informatics Tomas Bata University in Zlín Zlin Czech Republic

The contribution is focused on brief description of proposed control design process and primarily on practical application of obtained simple robust control algorithms. The synthesis is based on general solutions of Diophantine equations in the ring of proper and stable rational functions, Youla-Kucera parameterization and divisibility conditions and one of its main advantages can be seen in existence of single scalar tuning parameter. The real-time control behaviour has been tested on laboratory model of hot-air tunnel which has been mathematically described by various transfer functions containing parametric type of uncertainty.

关键词： Robust control control systems Uncertainty Tuning Transfer functions Optimal control control design control system synthesis Equations Testing

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Separation methods for dynamic errors-in-variables system identification

Separation methods for dynamic errors-in-variables system id...

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European control Conference (ECC)

作者： Levente Hunyadi István Vajk Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary HAS-BUTE Control Research Group

Unlike standard output error models, both input and output observations of errors-in-variables systems are corrupted with noise. As practical applications often fall into the errors-in-variables category, estimation methods that can simultaneously derive model and noise parameters are of particular interest. In this paper, we explore separation mechanisms applied on the combined input and output observation matrix to partition observations into two sets, after which it is possible to perform parameter estimation over the individual sets, and the estimates may, in turn, be compared. Minimizing the distance between parameter estimates, it is shown that we may infer a noise structure. Once a noise structure estimate is at hand, a maximum likelihood estimation may yield model parameter estimates.

关键词： Noise Vectors Frequency-domain analysis Covariance matrices Biological system modeling Time-domain analysis

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Simulation and control for telerobots in space medicine

Simulation and control for telerobots in space medicine

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作者： Haidegger, Tamas Kovaacs, Levente Precup, Radu-Emil Benyo, Balaazs Benyo, Zoltan Preitl, Stefan Department of Control Engineering and Information Technology Budapest University of Technology and Economics Magyar tudosok krt. 2 H-1117 Budapest Hungary Department of Automation and Applied Informatics Politehnica University OfTimisoara Bd. V. Parvan 2 RO-300223 Timisoara Romania

Human space exploration is continuously advancing despite the current financial difficulties, and the new missions are targeting the Moon and the Mars with more effective human-robot collaborative systems. The continuous development of robotic technology should lead to the advancement of automated technology, including space medicine. Telesurgery has already proved its effectiveness through various telemedi-cine procedures on Earth, and it has the potential to provide medical assistance in space as well. Aeronautical agencies have already conducted numerous experiments and developed various setups to push the boundaries of teleoperation under extreme conditions. Different control schemes have been proposed and tested to facilitate and enhance telepresence and to ensure transparency, sufficient bandwidth and latency-tolerance. This paper focuses on the modeling of a generic telesurgery setup, supported by a cascade control approach. The minimalistic models were tested with linear and PID-fuzzy control options to provide a simple, universal and scalable solution for the challenges of telesurgery over large distances. In our simulations, the control structures were capable of providing good dynamic performance indices and robustness with respect to the gain in the human operator model. This is a promising result towards the support of future teleoperational missions. © 2012 Elsevier Ltd. All rights reserved.

关键词： Delay control systems

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Introduction to MATLAB

Advanced Textbooks in Control and Signal Processing

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Advanced Textbooks in control and Signal Processing 2019年 1-27页

作者： Keviczky, László Bars, Ruth Hetthéssy, Jenő Bányász, Csilla Institute for Computer Science and Control Hungarian Academy of Sciences Budapest Hungary Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary

MATLAB™ is an interactive environment for scientific and engineering calculations, simulations, and data visualization. MATLAB™ provides a powerful platform to solve mathematical and engineering problems related to matrix algebra, differential equations, etc. MATLAB is especially effective in solving control problems. SIMULINK provides block-oriented simulation. The chapter gives a short introduction to MATLAB and SIMULINK. © Springer Nature Singapore Pte Ltd. 2019.

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Fractional order PDμ control of a visual servoing manipulator system

Fractional order PDμ control of a visual servoing manipulat...

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European control Conference (ECC)

作者： Cosmin Copot Clara M. Ionescu Corneliu Lazar Robin De Keyser Department of Electrical energy Systems and Automation Ghent University Belgium Department of Automatic Control and Applied Informatics Technical University of Iasi Romania

ISBN: (纸本)9781479901890

In this paper, a fractional order PD μ controller based on visual features is presented. A manipulator robot with 6 degrees of freedom and an eye-in-hand camera configuration is employed to design a visual servoing control architecture. The image based control law was designed using point features. A Matlab simulator which implements the visual control architecture was developed and the results were compared with a classical integer order controller. The validity of the visual based controllers is shown by the simulation results which demonstrate that the proposed approach based on a fractional order controller has a stable and convergent behavior when dealing with visual servoing applications. The fractional order PD μ controller provides better performances in comparison with an integer order PD controller.

关键词： Cameras Visualization Robot kinematics Visual servoing

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