Jan Simon

@uniza.sk

Department of Applied Mathematics, Faculty of Mechanical Engineering
University of Zilina

Jan Simon


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https://researchid.co/jansimon
18

Scopus Publications

194

Scholar Citations

7

Scholar h-index

6

Scholar i10-index

Scopus Publications

  • Radiocarbon activity of gases in urban surface air in Bratislava, Slovakia
    I. Kontul, P.P. Povinec, M. Richtáriková, A. Cherkinsky, J. Šimon, et al.
    Journal of Environmental Radioactivity, 2026
  • Energy Optimal Control of Electromechanical Systems: Trade-off Demands
    Branislav Ftorek, Vladimír Vavrúš, Ján Šimon, Ján Vittek
    Power Electronics and Drives, 2025
    This study presents research on the impact of the selection of the required manoeuvre time on the energy consumption of an electromechanical system, using the example of a train. Two different energy conservation control strategies [energy optimal control (EOC) and energy near-optimal control (ENOC)] were applied to assess their consumption as a function of recommended travel time. The optimal control variables are provided by an energy-saving reference position generator, whose outputs are then faithfully followed using a feedback control based on field orientation, and this is accomplished with a matched zero dynamic lag pre-compensator, yielding the required closed-loop dynamics. The load torque, consisting of constant, linear and quadratic components as a function of speed, is treated as a state variable. The potential for energy savings by reducing the speed of such systems was verified through MATLAB simulations. As a representative controlled electromechanical system, a suburban train unit was chosen for simulations to evaluate the energy consumption of both control approaches.
  • Exploitation of Energy Optimal and Near-Optimal Control for Traction Drives with AC Motors
    Branislav Ftorek, Ján Šimon, Michail Kiselev, Vladimír Vavrúš, Ján Vittek
    Symmetry, 2022
    The main contribution of this paper is the verification of a new train control system applied to the drive with a.c. motors that is energy near optimal with respect to electrical and mechanical energy minimization. All simulations are related to the one traction motor yielding its best exploitation. Load torque treated as a state variable consists of constant, linear, and quadratic components as a function of rotor speed. The required performance of the energy-saving control is rendered straightforward using precomputed energy optimal state variables or a prediction of losses for a symmetrical trapezoidal speed profile as the second alternative. An energy-saving reference position generator provides the state variables, which are faithfully followed by a feedback control based on field orientation, which is completed with a matched zero dynamic lag pre-compensator yielding prescribed closed-loop dynamics. Simulation results mutually compared confirm the capability of an overall drive control system to follow generated state variables for two different service conditions and the possibility of energy savings.
  • Basic Statistical Properties of the Knot Efficiency
    Ján Šimon, Branislav Ftorek
    Symmetry, 2022
    A knot is the weakest point of every rope, and the knot efficiency measures the portion of original rope strength taken away by the knot. Despite possible safety implications, surprisingly little attention has been paid to this life-critical quantity in research papers. Knot efficiency is directly immeasurable and the only way to obtain it is by calculation from rope breaking strength. However, this complication makes room for a wide spectrum of misleading concepts. The vast majority of authors do not treat knot efficiency as a random variable, and published results mostly suffer from incorrect statistical processing. The main goal of the presented paper is to fix this issue by proposing correct statistical tools needed for knot efficiency assessment. The probability density function of knot efficiency ψ(η) has been derived in general, as well as for normally distributed breaking strength. Statistical properties of knot efficiency PDF have been discussed, and a less complex approximation of knot efficiency PDF has been proposed and investigated.
  • Revision of commonly used loop knots efficiencies
    J. Šimon, V. Dekýš, P. Palček
    Acta Physica Polonica A, 2020
    Department of Applied Mathematics, Faculty of Mechanical Engineering, University of Žilina, Univerzitná 8215/1, 010 26 Žilina, Slovakia Department of Applied Mechanics, Faculty of Mechanical Engineering, University of Žilina, Univerzitná 8215/1, 010 26 Žilina, Slovakia Department of Materials Engineering, Faculty of Mechanical Engineering, University of Žilina, Univerzitná 8215/1, 010 26 Žilina, Slovakia
  • Statistical analysis of the wind speed at mountain site Chopok, Slovakia, using Weibull distribution
    I Pobočíková, Z Sedliačková, J Šimon, D Jurášová
    Iop Conference Series Materials Science and Engineering, 2020
    The 2-parameter Weibull distribution was used to analyse the wind speed at high-altitude mountain site Chopok, situated in the central part of Nízke Tatry mountains in Slovakia. Analysed wind speed data has been collected over 11 year period (2005–2015) and measured under standard conditions – in the height of 10 m over above ground using calibrated anemometers. Suitability of Weibull distribution was assessed using the coefficient of determination and root mean square error. From the results it is concluded that the 2-parameter Weibull distribution adequately describe the observed wind speed and can be used with acceptable statistical accuracy for prediction the wind speed data at this location.
  • Contribution to the determination of the thermal emissivity of the composite material using longwave infrared camera
    Ondrej Stalmach, Vladimir Dekys, Frantisek Barnik, Jan Simon
    Matec Web of Conferences, 2018
    This paper deals with measurement of emissivity of the composite samples. Three composite samples with the different thickness are heated to the temperature sixty-five degrees Celsius. On each sample must be applied a known emissivity coating. Unknown emissivity is calculated using the information obtained during the measurement. The aim of this paper is to show one of the possible approaches to find out the emissivity of the composite material.
  • Comparative study of seven methods for estimating the weibull distribution parameters for wind speed in bratislava - mlynská dolina
    17th Conference on Applied Mathematics Aplimat 2018 Proceedings, 2018
  • A simple mathematical model of cyclic circadian learning
    J. Šimon, M. Bulko
    Journal of Applied Mathematics, 2014
    This paper deals with the derivation of a simple mathematical model of cyclic learning with a period of 24 hours. Various requirements are met with an emphasis and approach which relies on simple mathematical operations, the prediction of measurable quantities, and the creation of uncomplicated processes of calibration. The presented model can be used to answer questions such as the following.Will I be able to memorize a given set of information? How long will it take to memorize information? How long will I remember the information that was memorized?The model is based on known memory retention functions that are in good agreement with experimental results. By the use of these functions and by formalism of differential equations, the concurrent processes of learning and forgetting are described mathematically. The usability of this model is limited to scenarios where logical bonds (connections to prior learning) are not created and mnemonic devices cannot be utilized during the learning process.
  • Statistical analysis of wind speed data based on Weibull and Rayleigh distribution
    Communications Scientific Letters of the University of Zilina, 2014
  • A simple mathematical model of human memory
    17th Conference of Czech and Slovak Physicists Proceedings, 2011
  • Estimation of long-term trends in the tropospheric 14CO2 activity concentration
    I Svetlik, P P Povinec, M Molnár, F Meinhardt, V Michálek, et al.
    Radiocarbon, 2010
  • Modeling of temporal variations of vertical concentration profile of 7Be in the atmosphere
    Jan Simon, Jana Meresova, Ivan Sykora, Miroslav Jeskovsky, Karol Holy
    Atmospheric Environment, 2009
  • Forty years of atmospheric radiocarbon monitoring around Bohunice nuclear power plant, Slovakia
    P.P. Povinec, M. Chudý, A. Šivo, J. Šimon, K. Holý, et al.
    Journal of Environmental Radioactivity, 2009
  • Impact of the Bohunice Nuclear Power Plant on atmospheric radiocarbon
    P.P. Povinec, A. Šivo, J. Šimon, K. Holý, M. Chudý, et al.
    Applied Radiation and Isotopes, 2008
  • Modelling of 7Be vertical concentration profiles
    16th Conference of Czech and Slovak Physicists Proceedings, 2008
  • Equivalent mixing height and 222Rn
    J. Šimon, K. Holý, M. Bulko, Carlos Granja, Claude Leroy, et al.
    Aip Conference Proceedings, 2007
  • Outdoor radon - Sources, monitoring and risk assessment
    M. Bulko, K. Holy, M. Mullerova, J. Simon, Carlos Granja, et al.
    Aip Conference Proceedings, 2007

RECENT SCHOLAR PUBLICATIONS

  • Radiocarbon activity of gases in urban surface air in Bratislava, Slovakia
    I Kontul, PP Povinec, M Richtáriková, A Cherkinsky, J Šimon, M Ješkovský, ...
    Journal of Environmental Radioactivity 296, 107995 , 2026
    2026
    Citations: 1
  • Energy Optimal Control of Electromechanical Systems: Trade-off Demands
    B Ftorek, V Vavrúš, J Šimon, J Vittek
    Power Electronics and Drives 10, 177-187 , 2025
    2025
  • Exploitation of energy optimal and near-optimal control for traction drives with AC motors
    B Ftorek, J Šimon, M Kiselev, V Vavrúš, J Vittek
    Symmetry 14 (12), 2613 , 2022
    2022
    Citations: 1
  • Basic Statistical Properties of the Knot Efficiency
    J Šimon, B Ftorek
    Symmetry 14 (9), 1926 , 2022
    2022
    Citations: 2
  • Exploitation of Energy Optimal and Near-Optimal Control for Traction Drives with AC Motors. Symmetry 2022, 14, 2613
    B Ftorek, J Šimon, M Kiselev, V Vavrúš, J Vittek
    s Note: MDPI stays neutral with regard to jurisdictional claims in published … , 2022
    2022
  • Krivky a krivkové integrály
    J Šimon
    2020
  • Revision of commonly used loop knots efficiencies
    J Šimon, V Dekýš, P Palček
    Acta physica polonica A 138 (3), 404-420 , 2020
    2020
    Citations: 16
  • Statistical analysis of the wind speed at mountain site Chopok, Slovakia, using Weibull distribution
    I Pobočíková, Z Sedliačková, J Šimon, D Jurášová
    IOP Conference Series: Materials Science and Engineering 776 (1), 012114 , 2020
    2020
    Citations: 9
  • Variations 14C and 13C in the atmosphere of different regions of Slovakia
    K Holy, A Sivo, P Povinec, M Richtarikova, M Muellerova, M Bulko, ...
    XXXIX Days of Radiation Protection. Proceedings of Abstracts, 72-72 , 2018
    2018
  • Comparative study of seven methods for estimating the weibull distribution parameters for wind speed in bratislava - mlynská dolina
    I Pobočíková, Z Sedliačková, J Šimon
    17th Conference on Applied Mathematics, APLIMAT 2018 - Proceedings, 840-852 , 2018
    2018
    Citations: 7
  • Contribution to the determination of the thermal emissivity of the composite material using longwave infrared camera
    O Stalmach, V Dekys, F Barnik, J Simon
    MATEC web of conferences 244, 01026 , 2018
    2018
    Citations: 11
  • Statistical analysis of wind speed data based on Weibull and Rayleigh distribution
    I Pobocikova, Z Sedliackova, J Simon
    Communications-Scientific letters of the University of Zilina 16 (3A), 136-141 , 2014
    2014
    Citations: 6
  • A simple mathematical model of cyclic circadian learning
    J Šimon, M Bulko
    Journal of Applied Mathematics 2014 (1), 592587 , 2014
    2014
    Citations: 5
  • A simple mathematical model of human memory
    J Šimon, D Giglerová, M Bulko
    17th Conference of Czech and Slovak Physicists, Proceedings, 69-70 , 2011
    2011
  • The study of variations and environmental applications 14C
    J Simon, K Holy
    Comenius University, Faculty of Mathematics, Physics and Informatics, 84218 … , 2010
    2010
  • {sup 7} Be and {sup 210} Pb as tracers of vertical circulation of air masses in the atmosphere; Radionuklidy {sup 7} Be a {sup 210} Pb ako stopovace vertikalnej vymeny …
    M Jeskovsky, I Sykora, K Holy, M Muellerova, J Meresova, J Simon
    Bezpecnost Jaderne Energie 18 , 2010
    2010
  • 7Be and 210Pb as tracers of vertical circulation of air masses in the atmosphere
    M Jeskovsky, I Sykora, K Holy, M Muellerova, J Meresova, J Simon
    2010
  • Estimation of long-term trends in the tropospheric 14CO2 activity concentration
    I Svetlik, PP Povinec, M Molnár, F Meinhardt, V Michalek, J Simon, ...
    Radiocarbon 52 (2), 815-822 , 2010
    2010
    Citations: 23
  • Modeling of temporal variations of vertical concentration profile of 7Be in the atmosphere
    J Simon, J Meresova, I Sykora, M Jeskovsky, K Holy
    Atmospheric environment 43 (12), 2000-2004 , 2009
    2009
    Citations: 28
  • Forty years of atmospheric radiocarbon monitoring around Bohunice nuclear power plant, Slovakia
    PP Povinec, M Chudý, A Šivo, J Šimon, K Holý, M Richtáriková
    Journal of Environmental Radioactivity 100 (2), 125-130 , 2009
    2009
    Citations: 43

MOST CITED SCHOLAR PUBLICATIONS

  • Forty years of atmospheric radiocarbon monitoring around Bohunice nuclear power plant, Slovakia
    PP Povinec, M Chudý, A Šivo, J Šimon, K Holý, M Richtáriková
    Journal of Environmental Radioactivity 100 (2), 125-130 , 2009
    2009
    Citations: 43
  • Modeling of temporal variations of vertical concentration profile of 7Be in the atmosphere
    J Simon, J Meresova, I Sykora, M Jeskovsky, K Holy
    Atmospheric environment 43 (12), 2000-2004 , 2009
    2009
    Citations: 28
  • Impact of the Bohunice nuclear power plant on atmospheric radiocarbon
    PP Povinec, A Šivo, J Šimon, K Holý, M Chudý, M Richtáriková, J Morávek
    Applied Radiation and Isotopes 66 (11), 1686-1690 , 2008
    2008
    Citations: 26
  • Estimation of long-term trends in the tropospheric 14CO2 activity concentration
    I Svetlik, PP Povinec, M Molnár, F Meinhardt, V Michalek, J Simon, ...
    Radiocarbon 52 (2), 815-822 , 2010
    2010
    Citations: 23
  • Revision of commonly used loop knots efficiencies
    J Šimon, V Dekýš, P Palček
    Acta physica polonica A 138 (3), 404-420 , 2020
    2020
    Citations: 16
  • Contribution to the determination of the thermal emissivity of the composite material using longwave infrared camera
    O Stalmach, V Dekys, F Barnik, J Simon
    MATEC web of conferences 244, 01026 , 2018
    2018
    Citations: 11
  • Statistical analysis of the wind speed at mountain site Chopok, Slovakia, using Weibull distribution
    I Pobočíková, Z Sedliačková, J Šimon, D Jurášová
    IOP Conference Series: Materials Science and Engineering 776 (1), 012114 , 2020
    2020
    Citations: 9
  • Comparative study of seven methods for estimating the weibull distribution parameters for wind speed in bratislava - mlynská dolina
    I Pobočíková, Z Sedliačková, J Šimon
    17th Conference on Applied Mathematics, APLIMAT 2018 - Proceedings, 840-852 , 2018
    2018
    Citations: 7
  • Statistical analysis of wind speed data based on Weibull and Rayleigh distribution
    I Pobocikova, Z Sedliackova, J Simon
    Communications-Scientific letters of the University of Zilina 16 (3A), 136-141 , 2014
    2014
    Citations: 6
  • A simple mathematical model of cyclic circadian learning
    J Šimon, M Bulko
    Journal of Applied Mathematics 2014 (1), 592587 , 2014
    2014
    Citations: 5
  • Volume activity of {sup 222} Rn in the atmosphere of the nearby localities with the different orography
    M Bulko, K Holy, A Polaskova, J Simon, O Hola
    2006
    Citations: 4
  • Radon in the atmosphere in two different localities of Slovakia
    M Bulko, K Holý, T Melicherová, A Polášková, J Šimon, M Műllerová, ...
    Acta Facultaties Ecologiae 14, 7-13 , 2006
    2006
    Citations: 3
  • Variations of 222 Rn activity concentrations and stability indexes in the outdoor atmosphere
    M BULKO, K HOLÝ, J Šimon, A POLÁŠKOVÁ, O HOLÁ
    XXVIII. Days of radiation protection (Proc. Conf. Luhačovice, 2006), ČVUT … , 2006
    2006
    Citations: 3
  • Basic Statistical Properties of the Knot Efficiency
    J Šimon, B Ftorek
    Symmetry 14 (9), 1926 , 2022
    2022
    Citations: 2
  • Outdoor radon as an indicator of atmospheric stability
    M Bulko, K Holy, A Polaskova, J Hrvol, J Simon
    Acta Facultatis Ecologiae 16 , 2007
    2007
    Citations: 2
  • Radiocarbon activity of gases in urban surface air in Bratislava, Slovakia
    I Kontul, PP Povinec, M Richtáriková, A Cherkinsky, J Šimon, M Ješkovský, ...
    Journal of Environmental Radioactivity 296, 107995 , 2026
    2026
    Citations: 1
  • Exploitation of energy optimal and near-optimal control for traction drives with AC motors
    B Ftorek, J Šimon, M Kiselev, V Vavrúš, J Vittek
    Symmetry 14 (12), 2613 , 2022
    2022
    Citations: 1
  • Determination of equivalent mixing height and atmospheric stability assessment
    J Simon, M Bulko, K Holy
    Acta Facultatis Ecologiae 16 , 2007
    2007
    Citations: 1
  • SEASONAL VARIATIONS OF 13C AND 14C IN SOIL CO
    J ŠIMON, A ŠIVO, M RICHTÁRIKOVÁ, K HOLÝ, PP POVINEC, ...
    Acta Facultatis Ecologiae, 73 , 2006
    2006
    Citations: 1
  • 222Rn in the outdoor atmosphere-trends, variations and radiation exposure
    K Holy, M Bulko, A Polaskova, J Simon, R Boehm, O Hola
    XXVII. Days of Radiation Protection. Conference Proceedings, 74-77 , 2005
    2005
    Citations: 1