Jan Simon

@uniza.sk

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



                    

https://researchid.co/jansimon
14

Scopus Publications

159

Scholar Citations

6

Scholar h-index

4

Scholar i10-index

Scopus Publications

  • Exploitation of Energy Optimal and Near-Optimal Control for Traction Drives with AC Motors
    Branislav Ftorek, Ján Šimon, Michail Kiselev, Vladimír Vavrúš, and Ján Vittek
    MDPI AG
    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 and Branislav Ftorek
    MDPI AG
    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, and P. Palček
    Institute of Physics, Polish Academy of Sciences
    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, and D Jurášová
    IOP Publishing
    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, and Jan Simon
    EDP Sciences
    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


  • Statistical analysis of wind speed data based on Weibull and Rayleigh distribution


  • A simple mathematical model of cyclic circadian learning
    J. Šimon and M. Bulko
    Hindawi Limited
    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.

  • A simple mathematical model of human memory


  • Estimation of long-term trends in the tropospheric <sup>14</sup>CO<inf>2</inf> activity concentration
    I Svetlik, P P Povinec, M Molnár, F Meinhardt, V Michálek, J Simon, and É Svingor
    Cambridge University Press (CUP)
    Fossil CO2 emissions have been diluting the global 14C/C ratio of atmospheric CO2 (Suess effect). We estimated the 14CO2 amount in the atmosphere (and its trend) utilizing the calculated 14CO2 activity concentration in the atmosphere (aacn, reported in mBq m–3). This parameter, calculated from Δ14CO2 and the CO2 mixing ratio (reported in micromoles of CO2 per mole of air), is connected with the 14CO2 quantity in the volume or mass unit of air, which is not influenced by the Suess effect. This parameter can only be influenced by processes linked to 14CO2 emissions/uptake, e.g. associated with atmosphere-biosphere or atmosphere-ocean CO2 exchange as well as by anthropogenic emissions of 14CO2. Results obtained from measurements at Schauinsland station, Germany, indicate a stable amount of 14CO2 in the atmosphere since the early 1990s.

  • Modeling of temporal variations of vertical concentration profile of <sup>7</sup>Be in the atmosphere
    Jan Simon, Jana Meresova, Ivan Sykora, Miroslav Jeskovsky, and Karol Holy
    Elsevier BV

  • Forty years of atmospheric radiocarbon monitoring around Bohunice nuclear power plant, Slovakia
    P.P. Povinec, M. Chudý, A. Šivo, J. Šimon, K. Holý, and M. Richtáriková
    Elsevier BV

  • Impact of the Bohunice Nuclear Power Plant on atmospheric radiocarbon
    P.P. Povinec, A. Šivo, J. Šimon, K. Holý, M. Chudý, M. Richtáriková, and J. Morávek
    Elsevier BV

  • Modelling of 7Be vertical concentration profiles


  • Equivalent mixing height and <sup>222</sup>Rn
    J. Šimon, K. Holý, M. Bulko, Carlos Granja, Claude Leroy, and Ivan Stekl
    AIP
    This paper deals with the so‐called quantity “equivalent mixing height” (h), closely related to the dynamic state of the ground and boundary layer of the atmosphere, where convective flows of substances are present. Based on the theory of fluid mechanics, equations describing h are derived. Quantitative relations between 222Rn volume activity, h and eddy diffusion coefficient are described. A possibility of using h for assessing the atmospheric stability is explored.

  • Outdoor radon - Sources, monitoring and risk assessment
    M. Bulko, K. Holy, M. Mullerova, J. Simon, Carlos Granja, Claude Leroy, and Ivan Stekl
    AIP
    Various sources of atmospheric radon, as well as the results of radon monitoring at the Faculty of Mathematics, Physics and Informatics (FMFI CU) campus are discussed. The evaluation of the risk caused by radon and its decay products in the Bratislava atmosphere is given.

RECENT SCHOLAR PUBLICATIONS

  • Exploitation of Energy Optimal and Near-Optimal Control for Traction Drives with AC Motors
    B Ftorek, J Šimon, M Kiselev, V Vavrš, J Vittek
    Symmetry 14 (12), 2613 2022

  • Basic Statistical Properties of the Knot Efficiency
    J Šimon, B Ftorek
    Symmetry 14 (9), 1926 2022

  • 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 Vavrš, J Vittek
    s Note: MDPI stays neutral with regard to jurisdictional claims in published 2022

  • Krivky a krivkov integrly
    J Šimon
     2020

  • Revision of commonly used loop knots efficiencies
    J Šimon, V Dekš, P Palček
    Acta physica polonica A 138 (3), 404-420 2020

  • Statistical analysis of the wind speed at mountain site Chopok, Slovakia, using Weibull distribution
    I Pobočkov, Z Sedliačkov, J Šimon, D Juršov
    IOP Conference Series: Materials Science and Engineering 776 (1), 012114 2020

  • Variations 14C and 13C in the atmosphere of different regions of Slovakia
    K Holy, A Sivo, P Povinec, M Richtarikova, M Muellerova, M Bulko, ...
     2018

  • Comparative study of seven methods for estimating the weibull distribution parameters for wind speed in bratislava - mlynsk dolina
    I Pobočkov, Z Sedliačkov, J Šimon
    17th Conference on Applied Mathematics, APLIMAT 2018 - Proceedings, 840-852 2018

  • 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

  • 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

  • A simple mathematical model of cyclic circadian learning
    J Šimon, M Bulko
    Journal of Applied Mathematics 2014 (1), 592587 2014

  • A simple mathematical model of human memory
    J Šimon, D Giglerov, M Bulko
    17th Conference of Czech and Slovak Physicists, Proceedings, 69-70 2011

  • The study of variations and environmental applications" 1" 4C
    J Simon
     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

  • Estimation of long-term trends in the tropospheric 14CO2 activity concentration
    I Svetlik, PP Povinec, M Molnr, F Meinhardt, V Michlek, J Simon, ...
    Radiocarbon 52 (2), 815-822 2010

  • 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

  • Forty years of atmospheric radiocarbon monitoring around Bohunice nuclear power plant, Slovakia
    PP Povinec, M Chud, A Šivo, J Šimon, K Hol, M Richtrikov
    Journal of Environmental Radioactivity 100 (2), 125-130 2009

  • Impact of the Bohunice nuclear power plant on atmospheric radiocarbon
    PP Povinec, A Šivo, J Šimon, K Hol, M Chud, M Richtrikov, J Morvek
    Applied Radiation and Isotopes 66 (11), 1686-1690 2008

  • Modelling of 7Be vertical concentration profiles
    J Šimon, J Merešov, I Skora, M Ješkovsk, K Hol
    16th Conference of Czech and Slovak Physicists; Hradec Kralove; Czech 2008

  • Equivalent Mixing Height and
    J Šimon, K Hol, M Bulko
    AIP Conference Proceedings 958 (1), 238-239 2007

MOST CITED SCHOLAR PUBLICATIONS

  • Forty years of atmospheric radiocarbon monitoring around Bohunice nuclear power plant, Slovakia
    PP Povinec, M Chud, A Šivo, J Šimon, K Hol, M Richtrikov
    Journal of Environmental Radioactivity 100 (2), 125-130 2009
    Citations: 44

  • 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
    Citations: 30

  • Impact of the Bohunice nuclear power plant on atmospheric radiocarbon
    PP Povinec, A Šivo, J Šimon, K Hol, M Chud, M Richtrikov, J Morvek
    Applied Radiation and Isotopes 66 (11), 1686-1690 2008
    Citations: 26

  • Estimation of long-term trends in the tropospheric 14CO2 activity concentration
    I Svetlik, PP Povinec, M Molnr, F Meinhardt, V Michlek, J Simon, ...
    Radiocarbon 52 (2), 815-822 2010
    Citations: 23

  • Revision of commonly used loop knots efficiencies
    J Šimon, V Dekš, P Palček
    Acta physica polonica A 138 (3), 404-420 2020
    Citations: 11

  • Statistical analysis of the wind speed at mountain site Chopok, Slovakia, using Weibull distribution
    I Pobočkov, Z Sedliačkov, J Šimon, D Juršov
    IOP Conference Series: Materials Science and Engineering 776 (1), 012114 2020
    Citations: 8

  • Comparative study of seven methods for estimating the weibull distribution parameters for wind speed in bratislava - mlynsk dolina
    I Pobočkov, Z Sedliačkov, J Šimon
    17th Conference on Applied Mathematics, APLIMAT 2018 - Proceedings, 840-852 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
    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
    Citations: 5

  • A simple mathematical model of cyclic circadian learning
    J Šimon, M Bulko
    Journal of Applied Mathematics 2014 (1), 592587 2014
    Citations: 4

  • 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 Hol, T Melicherov, A Polškov, J Šimon, M Műllerov, ...
    Acta Facultaties Ecologiae 14, 7-13 2006
    Citations: 4

  • Outdoor radon as an indicator of atmospheric stability
    M Bulko, K Holy, A Polaskova, J Hrvol, J Simon
    Acta Facultatis Ecologiae 16 2007
    Citations: 3

  • Variations of 222 Rn activity concentrations and stability indexes in the outdoor atmosphere
    M BULKO, K HOL, J Šimon, A POLŠKOV, O HOL
    XXVIII. Days of radiation protection (Proc. Conf. Luhačovice, 2006), ČVUT 2006
    Citations: 3

  • Determination of equivalent mixing height and atmospheric stability assessment
    J Simon, M Bulko, K Holy
    Acta Facultatis Ecologiae 16 (Suppl. 1), 37-43 2007
    Citations: 2

  • Exploitation of Energy Optimal and Near-Optimal Control for Traction Drives with AC Motors
    B Ftorek, J Šimon, M Kiselev, V Vavrš, J Vittek
    Symmetry 14 (12), 2613 2022
    Citations: 1

  • Basic Statistical Properties of the Knot Efficiency
    J Šimon, B Ftorek
    Symmetry 14 (9), 1926 2022
    Citations: 1

  • SEASONAL VARIATIONS OF 13C AND 14C IN SOIL CO
    J ŠIMON, A ŠIVO, M RICHTRIKOV, K HOL, PP POVINEC, ...
    Acta Facultatis Ecologiae, 73 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
     2005
    Citations: 1