Hana Charvatova - Academia.edu (original) (raw)

Papers by Hana Charvatova

The paper presents specific methods of processing of multimodal data recorded during physical act... more The paper presents specific methods of processing of multimodal data recorded during physical activities by depth MS Kinect cameras, thermal imaging cameras and heart rate sensors. All video data and heart rate signals used in the present study were recorded in the home environment. The proposed methodology includes the detection of the chest breathing area for breathing motion analysis used by the MS Kinect. For the thermal image processing the static and dynamic selection of regions of interests was performed in associated sets of images to find time evolution of respiratory signals and their temperature changes. Signal de-noising by finite impulse filters is applied both for breathing and heart rate data. Correlation analysis is used in the data processing stage to find the time relation between individual physiological variables. Results include relations between signals acquired during physical activities and they show how simple sensors can be used to increase the accuracy of standard diagnostical tools in biomedicine as well.

Trendy ve vzdělávání, 2014

Clanek popisuje jak jeho autoři vytvořili webove stranky pro výuku diferencialniho a integralniho... more Clanek popisuje jak jeho autoři vytvořili webove stranky pro výuku diferencialniho a integralniho poctu funkci vice proměnných na Univerzitě Tomase Bati ve Zlině. Stranky jsou volně přistupne a materialy v nich obsažene si může kdokoli stahnout. Cenne jsou zejmena obrazky, ktere zahrnuji jejich strucny matematický popis a jejich dvojrozměrne a trojrozměrne animace z diferencialniho a integralniho poctu. Zminěne ucivo je vyucovano obvykle v bakalařskem stupni studia na univerzitach technických oborů. Zde uvedene zkusenosti mohou využit pedagogove, a nejen oni, při sestavovani svých vlastnich webových stranek.

IEEE Access, 2023

Computer simulations are used to assess the impact of thermal insulation on the transfer of heat ... more Computer simulations are used to assess the impact of thermal insulation on the transfer of heat and moisture in the exterior walls of residential buildings. The effects of internal and external thermal insulation on a room in a terraced family house are compared using the COMSOL Multiphysics software package, evaluating the influence of the placement of expanded polystyrene thermal insulation on the distribution of temperature and moisture in the external wall while monitoring the indoor air temperature during the heating and cooling modes. The internal thermal insulation is more efficient in terms of room heating, while the external insulation is preferable in reducing the risk of the condensation water vapor within the wall. The efficiency of heating the room at 20 • C increased by 12% when internal thermal insulation was added to the walls, compared to heating without insulation. The maximum value of relative humidity in the critical wall section decreased by 10% when external thermal insulation was added. Implementing internal thermal insulation needs the right choice of insulation material and its installation to prevent air leakage. The results suggest that the proper selection of the placement of the thermal insulation is critical for optimizing the thermal performance and reducing moisture-related problems in residential buildings. INDEX TERMS COMSOL multiphysics, cooling of a room, expanded polystyrene, external thermal insulation, heat transfer, heating of a room, internal thermal insulation, moisture transfer, numerical simulation, terrraced family house, thermal comfort.

Ministry of Education, Youth and Physical Training of the Czech Republic [504]; European Regional... more Ministry of Education, Youth and Physical Training of the Czech Republic [504]; European Regional Development Fund under the project CEBIA-Tech [CZ.1.05/2.1.00/03.0089]

Trendy ve vzdělávání, 2012

Trendy ve vzdělávání, 2012

The work follows with the previous investigation of the leather processes, which has already been... more The work follows with the previous investigation of the leather processes, which has already been realized for many years at the Department of Automation and Control Engineering at the Tomas Bata University in Zlin. It focuses on the formulation of a certain mathematical model of the deliming process enabling optimization of the process in tanning industry. The formulation of that mathematical model consists in determination of its statical and dynamical properties. For such purpose the experimental identification methods and consequently the mathematical modeling can be used. This analysis includes qualitative and quantitative characterization of the deliming process, which covers as its structure as the size. The aim of the work is a determination of the input parameters effect on the deliming process and first the determination of calcic ions binding force influence on the pelt collagen fibres.

Energies, Nov 19, 2020

The paper is devoted to computer simulations of the distribution and time evolution of the temper... more The paper is devoted to computer simulations of the distribution and time evolution of the temperature in a wooden house in summer. The goal of simulations was to assess the effect of covering walls inside the house with a PCM (phase change material) on its passive cooling, which prevents the undesired overheating of the house and provides the required thermal comfort for the occupants under warm summer days. Computer simulations were performed by the COMSOL Multiphysics software (COMSOL Inc., Stockholm, Sweden). A model of a house without the PCM coverage was compared with models of houses in which the PCM was located on all walls, except a floor, and on a wall opposite the window. Results of simulations proved that the wood wall thickness and PCMs location influence overheating the wooden house. Under studied conditions, the coverage of a wall opposite the window best eliminated extremes of the air temperature inside the house. The maximum temperature decrease was 3.9 • C (i.e., drop of 31.1%) comparing the house which wall opposite the window was covered by the PCM and the house without the PCM coverage.

IEEE Transactions on Neural Systems and Rehabilitation Engineering, 2022

Gait analysis and the assessment of rehabilitation exercises are important processes that occur d... more Gait analysis and the assessment of rehabilitation exercises are important processes that occur during fitness level monitoring and the treatment of neurological disorders. This paper presents the possibility of using oximetric, heart rate (HR), accelerometric, and global navigation satellite systems (GNSSs) to analyse signals recorded during uphill and downhill walking without and with a face mask to find its influence on physiological functions during selected walking patterns. The experimental dataset includes 86 signal segments acquired under different conditions. The proposed methodology is based on signal analysis in both the time and frequency domains. The results indicate that face mask use has a minimal effect on blood oxygen concentration and heart rate, with the average mean changes of these parameters being less than 2 %. The support vector machine, a Bayesian method, the k-nearest neighbour method, and a two-layer neural network showed very good separation abilities and successfully classified different walking patterns only in the case when the effect of face mask wearing was not included in the classification process. Our methodology suggests that artificial intelligence and machine learning tools are efficient methods for the assessment of motion patterns in different motion conditions and that face masks have a negligible effect for shortduration experiments.

Annals of DAAAM for ... & proceedings of the ... International DAAAM Symposium .., 2011

In this paper we deal with computer modeling of nonstationary conduction of heat in two-layer sol... more In this paper we deal with computer modeling of nonstationary conduction of heat in two-layer solid plate by mathematic software Maple. For this purpose, we describe user interface and basic functions of a software application that we programmed in the Maple for automatic computing of temperature fields in the solid plate during mentioned thermal processes.

Univerzita Tomáše Bati ve Zlíně, Fakulta aplikované informatiky eBooks, 2009

MATEC web of conferences, 2016

The work deals with the behaviour of the PIR detector in an environment with great influence of a... more The work deals with the behaviour of the PIR detector in an environment with great influence of a thermal background. It was necessary to perform simulations of the thermal behaviour of the sensor by COMSOL Multiphysics in different modes of heating the room to be able to prove that the PIR detector can function as an active detector with improved detection possibilities of intruders who would be invisible to a detector under normal circumstances. This confirms the detector's ability to work on the principle of active detector, i.e. as transmitter and receiver of thermal radiation and evaluation of heat flux changes depending on the type of the heater and the shrouding.

IEEE Transactions on Neural Systems and Rehabilitation Engineering, Jun 1, 2018

Multimodal signal analysis based on sophisticated noninvasive sensors, efficient communication sy... more Multimodal signal analysis based on sophisticated noninvasive sensors, efficient communication systems, and machine learning, have a rapidly increasing range of different applications. The present paper is devoted to pattern recognition and the analysis of physiological data acquired by heart rate and thermal camera sensors during rehabilitation. A total number of 56 experimental data sets, each 40 minutes long, of the heart rate and breathing temperature recorded on an exercise bike have been processed to determine the fitness level and possible medical disorders. The proposed general methodology combines machine learning methods for the detection of the changing temperature ranges of the thermal camera and adaptive image processing methods to evaluate the frequency of breathing. To determine the individual temperature values, a neural network model with the sigmoidal and the probabilistic transfer function in the first and the second layers are applied. Appropriate statistical methods are then used to find the correspondence between the exercise activity and selected physiological functions. The evaluated mean delay of 21 s of the heart rate drop related to the change of the activity level corresponds to results obtained in real cycling conditions. Further results include the average value of the change of the breathing temperature (167 s) and breathing frequency (49 s).

MATEC web of conferences, 2017

The paper presents the interim results of our research on the developing methodological procedure... more The paper presents the interim results of our research on the developing methodological procedure which could be used for assessment of a thermal stability of buildings with regards to its thermal accumulative parameters. The principle of testing is based on a combination of computer simulation of cooled room model developed in COMSOL Multiphysics software and on theoretical calculations with respect to compliance with valid European and Czech technical standards used in building industry and architecture under conditions obtained by real measurement for the room to be tested. The presented example shows the effect of the heataccumulation properties of the outside wall insulation materials on the course of the cooling room for winter conditions.

Communications in computer and information science, 2021

Infrared thermography has a wide range of applications both in engineering and biomedicine. Resul... more Infrared thermography has a wide range of applications both in engineering and biomedicine. Resulting video-images provide immediate information about thermal conditions on the surface of the observed object but for the more sophisticated analysis the detail evaluation of separate images is necessary. The processing of thermal images is based upon data acquisition by special non-invasive sensors, efficient communication systems, and the application of selected machine learning methods in many cases. The present paper is devoted to the recognition of thermal regions in the facial area, detection of the body temperature, and evaluation of breathing frequency and its possible disorders. Data include video-sequences acquired on the home exercise bike and recorded during different load conditions. The proposed general methodology combines the use of neural networks and machine learning methods for the detection of the changing temperature ranges of the thermal camera. Selected digital signal processing methods are then used to find the mean body temperature and breathing frequency during the specified time period. Results show the temperature changes and breathing frequency between 0.48 and 0.56 Hz for selected experiments and different body loads. © 2021, Springer Nature Switzerland AG

MATEC web of conferences, 2018

The paper deals with computer testing of the temperature distribution in buildings by using COM-S... more The paper deals with computer testing of the temperature distribution in buildings by using COM-SOL Multiphysics software. It is devoted to a description of a computer application created in the Application Builder user interface for simulation of the temperature distribution in a room heated by two heat sources. The application allows you to change geometric dimensions of all elements of the studied model and their spatial distribution, as well as a choice of physical properties needed to access the distribution of temperature in the room depending on the ambient temperature and the heat input of the considered sources. Main functions of the application are presented by simulation of cyclic heating and cooling of the tested room.

Sustainability, Jul 12, 2017

This paper reports the experimental and simulation analysis of a window system incorporating Phas... more This paper reports the experimental and simulation analysis of a window system incorporating Phase Change Materials (PCMs). In this study, the latent heat storage material is exploited to increase the thermal mass of the building component. A PCM-filled window can increase the possibilities of storage energy from solar radiation and reduce the heating cooling demand. The presented measurements were performed on a specific window panel that integrates a PCM. The PCM window panel consists of four panes of safety glass with three gaps, of which the first one contains a prismatic glass, the second a krypton gas, and the last one a PCM. New PCM window panel technology uses the placement of the PCM in the whole space of the window cavity. This technology improves the thermal performance and storage mass of the window panel. The results show the incongruent melting of salt hydrates and the high thermal inertia of the PCM window panel. The simulation data showed that the PCM window panel and the double glazing panel markedly reduced the peak temperature on the interior surface, reduced the air temperature inside the room, and also considerably improved the thermal mass of the building. This means that the heat energy entering the building through the panel is reduced by 66% in the summer cycle.

Trendy ve vzdělávání, 2012

Department of Mathematics of the Faculty of Applied Informatics of the Tomas Bata University in Z... more Department of Mathematics of the Faculty of Applied Informatics of the Tomas Bata University in Zlin has been dealing with the modern trends at teaching of mathematical subjects. In the submitted paper we are going to bring out a visual web presentation integrating text, figure and 3D animation which should innovate the Mathematics II subject. The visual web presentation will be placed for the disposal of general public on the Faculty of Applied Informatics of Tomas Bata University in Zlin server after its completing. The students of our university, especially the students in combined form of study, highly appreciate teaching with visual web presentation. Therefore we are convinced that also students of other universities, including those in distance study, can make use of this web presentation for reasons of its universality, usefulness and eye-appeal.Ministry of Education, Youth and Sports of the Czech Republic [504

WSEAS transactions on heat and mass transfer, 2017

The paper deals with the use of computer tools for assessing of the thermal stability of building... more The paper deals with the use of computer tools for assessing of the thermal stability of buildings. It describes the procedure developed for determining of a time constant for cooling down of the room and a coefficient α whose values are related to the building's thermal-accumulation properties. The developed methodological procedure is based on processing of the data obtained by measuring in the real building object, computer simulations in COMSOL Multiphysics software and subsequent processing of the output data in MAPLE and MATLAB software with regard to compliance with valid European and Czech technical standards used in building industry and Architecture. The studied model of the room showed the dependence of the time constant and the coefficient α on thickness and specific heat capacity of the thermal insulation of the external wall under the selected winter conditions. The studied example also proved correlation between the coefficient α and the time constant of the room.

The paper presents specific methods of processing of multimodal data recorded during physical act... more The paper presents specific methods of processing of multimodal data recorded during physical activities by depth MS Kinect cameras, thermal imaging cameras and heart rate sensors. All video data and heart rate signals used in the present study were recorded in the home environment. The proposed methodology includes the detection of the chest breathing area for breathing motion analysis used by the MS Kinect. For the thermal image processing the static and dynamic selection of regions of interests was performed in associated sets of images to find time evolution of respiratory signals and their temperature changes. Signal de-noising by finite impulse filters is applied both for breathing and heart rate data. Correlation analysis is used in the data processing stage to find the time relation between individual physiological variables. Results include relations between signals acquired during physical activities and they show how simple sensors can be used to increase the accuracy of standard diagnostical tools in biomedicine as well.

Trendy ve vzdělávání, 2014

Clanek popisuje jak jeho autoři vytvořili webove stranky pro výuku diferencialniho a integralniho... more Clanek popisuje jak jeho autoři vytvořili webove stranky pro výuku diferencialniho a integralniho poctu funkci vice proměnných na Univerzitě Tomase Bati ve Zlině. Stranky jsou volně přistupne a materialy v nich obsažene si může kdokoli stahnout. Cenne jsou zejmena obrazky, ktere zahrnuji jejich strucny matematický popis a jejich dvojrozměrne a trojrozměrne animace z diferencialniho a integralniho poctu. Zminěne ucivo je vyucovano obvykle v bakalařskem stupni studia na univerzitach technických oborů. Zde uvedene zkusenosti mohou využit pedagogove, a nejen oni, při sestavovani svých vlastnich webových stranek.

IEEE Access, 2023

Computer simulations are used to assess the impact of thermal insulation on the transfer of heat ... more Computer simulations are used to assess the impact of thermal insulation on the transfer of heat and moisture in the exterior walls of residential buildings. The effects of internal and external thermal insulation on a room in a terraced family house are compared using the COMSOL Multiphysics software package, evaluating the influence of the placement of expanded polystyrene thermal insulation on the distribution of temperature and moisture in the external wall while monitoring the indoor air temperature during the heating and cooling modes. The internal thermal insulation is more efficient in terms of room heating, while the external insulation is preferable in reducing the risk of the condensation water vapor within the wall. The efficiency of heating the room at 20 • C increased by 12% when internal thermal insulation was added to the walls, compared to heating without insulation. The maximum value of relative humidity in the critical wall section decreased by 10% when external thermal insulation was added. Implementing internal thermal insulation needs the right choice of insulation material and its installation to prevent air leakage. The results suggest that the proper selection of the placement of the thermal insulation is critical for optimizing the thermal performance and reducing moisture-related problems in residential buildings. INDEX TERMS COMSOL multiphysics, cooling of a room, expanded polystyrene, external thermal insulation, heat transfer, heating of a room, internal thermal insulation, moisture transfer, numerical simulation, terrraced family house, thermal comfort.

Ministry of Education, Youth and Physical Training of the Czech Republic [504]; European Regional... more Ministry of Education, Youth and Physical Training of the Czech Republic [504]; European Regional Development Fund under the project CEBIA-Tech [CZ.1.05/2.1.00/03.0089]

Trendy ve vzdělávání, 2012

Trendy ve vzdělávání, 2012

The work follows with the previous investigation of the leather processes, which has already been... more The work follows with the previous investigation of the leather processes, which has already been realized for many years at the Department of Automation and Control Engineering at the Tomas Bata University in Zlin. It focuses on the formulation of a certain mathematical model of the deliming process enabling optimization of the process in tanning industry. The formulation of that mathematical model consists in determination of its statical and dynamical properties. For such purpose the experimental identification methods and consequently the mathematical modeling can be used. This analysis includes qualitative and quantitative characterization of the deliming process, which covers as its structure as the size. The aim of the work is a determination of the input parameters effect on the deliming process and first the determination of calcic ions binding force influence on the pelt collagen fibres.

Energies, Nov 19, 2020

The paper is devoted to computer simulations of the distribution and time evolution of the temper... more The paper is devoted to computer simulations of the distribution and time evolution of the temperature in a wooden house in summer. The goal of simulations was to assess the effect of covering walls inside the house with a PCM (phase change material) on its passive cooling, which prevents the undesired overheating of the house and provides the required thermal comfort for the occupants under warm summer days. Computer simulations were performed by the COMSOL Multiphysics software (COMSOL Inc., Stockholm, Sweden). A model of a house without the PCM coverage was compared with models of houses in which the PCM was located on all walls, except a floor, and on a wall opposite the window. Results of simulations proved that the wood wall thickness and PCMs location influence overheating the wooden house. Under studied conditions, the coverage of a wall opposite the window best eliminated extremes of the air temperature inside the house. The maximum temperature decrease was 3.9 • C (i.e., drop of 31.1%) comparing the house which wall opposite the window was covered by the PCM and the house without the PCM coverage.

IEEE Transactions on Neural Systems and Rehabilitation Engineering, 2022

Gait analysis and the assessment of rehabilitation exercises are important processes that occur d... more Gait analysis and the assessment of rehabilitation exercises are important processes that occur during fitness level monitoring and the treatment of neurological disorders. This paper presents the possibility of using oximetric, heart rate (HR), accelerometric, and global navigation satellite systems (GNSSs) to analyse signals recorded during uphill and downhill walking without and with a face mask to find its influence on physiological functions during selected walking patterns. The experimental dataset includes 86 signal segments acquired under different conditions. The proposed methodology is based on signal analysis in both the time and frequency domains. The results indicate that face mask use has a minimal effect on blood oxygen concentration and heart rate, with the average mean changes of these parameters being less than 2 %. The support vector machine, a Bayesian method, the k-nearest neighbour method, and a two-layer neural network showed very good separation abilities and successfully classified different walking patterns only in the case when the effect of face mask wearing was not included in the classification process. Our methodology suggests that artificial intelligence and machine learning tools are efficient methods for the assessment of motion patterns in different motion conditions and that face masks have a negligible effect for shortduration experiments.

Annals of DAAAM for ... & proceedings of the ... International DAAAM Symposium .., 2011

In this paper we deal with computer modeling of nonstationary conduction of heat in two-layer sol... more In this paper we deal with computer modeling of nonstationary conduction of heat in two-layer solid plate by mathematic software Maple. For this purpose, we describe user interface and basic functions of a software application that we programmed in the Maple for automatic computing of temperature fields in the solid plate during mentioned thermal processes.

Univerzita Tomáše Bati ve Zlíně, Fakulta aplikované informatiky eBooks, 2009

MATEC web of conferences, 2016

The work deals with the behaviour of the PIR detector in an environment with great influence of a... more The work deals with the behaviour of the PIR detector in an environment with great influence of a thermal background. It was necessary to perform simulations of the thermal behaviour of the sensor by COMSOL Multiphysics in different modes of heating the room to be able to prove that the PIR detector can function as an active detector with improved detection possibilities of intruders who would be invisible to a detector under normal circumstances. This confirms the detector's ability to work on the principle of active detector, i.e. as transmitter and receiver of thermal radiation and evaluation of heat flux changes depending on the type of the heater and the shrouding.

IEEE Transactions on Neural Systems and Rehabilitation Engineering, Jun 1, 2018

Multimodal signal analysis based on sophisticated noninvasive sensors, efficient communication sy... more Multimodal signal analysis based on sophisticated noninvasive sensors, efficient communication systems, and machine learning, have a rapidly increasing range of different applications. The present paper is devoted to pattern recognition and the analysis of physiological data acquired by heart rate and thermal camera sensors during rehabilitation. A total number of 56 experimental data sets, each 40 minutes long, of the heart rate and breathing temperature recorded on an exercise bike have been processed to determine the fitness level and possible medical disorders. The proposed general methodology combines machine learning methods for the detection of the changing temperature ranges of the thermal camera and adaptive image processing methods to evaluate the frequency of breathing. To determine the individual temperature values, a neural network model with the sigmoidal and the probabilistic transfer function in the first and the second layers are applied. Appropriate statistical methods are then used to find the correspondence between the exercise activity and selected physiological functions. The evaluated mean delay of 21 s of the heart rate drop related to the change of the activity level corresponds to results obtained in real cycling conditions. Further results include the average value of the change of the breathing temperature (167 s) and breathing frequency (49 s).

MATEC web of conferences, 2017

The paper presents the interim results of our research on the developing methodological procedure... more The paper presents the interim results of our research on the developing methodological procedure which could be used for assessment of a thermal stability of buildings with regards to its thermal accumulative parameters. The principle of testing is based on a combination of computer simulation of cooled room model developed in COMSOL Multiphysics software and on theoretical calculations with respect to compliance with valid European and Czech technical standards used in building industry and architecture under conditions obtained by real measurement for the room to be tested. The presented example shows the effect of the heataccumulation properties of the outside wall insulation materials on the course of the cooling room for winter conditions.

Communications in computer and information science, 2021

Infrared thermography has a wide range of applications both in engineering and biomedicine. Resul... more Infrared thermography has a wide range of applications both in engineering and biomedicine. Resulting video-images provide immediate information about thermal conditions on the surface of the observed object but for the more sophisticated analysis the detail evaluation of separate images is necessary. The processing of thermal images is based upon data acquisition by special non-invasive sensors, efficient communication systems, and the application of selected machine learning methods in many cases. The present paper is devoted to the recognition of thermal regions in the facial area, detection of the body temperature, and evaluation of breathing frequency and its possible disorders. Data include video-sequences acquired on the home exercise bike and recorded during different load conditions. The proposed general methodology combines the use of neural networks and machine learning methods for the detection of the changing temperature ranges of the thermal camera. Selected digital signal processing methods are then used to find the mean body temperature and breathing frequency during the specified time period. Results show the temperature changes and breathing frequency between 0.48 and 0.56 Hz for selected experiments and different body loads. © 2021, Springer Nature Switzerland AG

MATEC web of conferences, 2018

The paper deals with computer testing of the temperature distribution in buildings by using COM-S... more The paper deals with computer testing of the temperature distribution in buildings by using COM-SOL Multiphysics software. It is devoted to a description of a computer application created in the Application Builder user interface for simulation of the temperature distribution in a room heated by two heat sources. The application allows you to change geometric dimensions of all elements of the studied model and their spatial distribution, as well as a choice of physical properties needed to access the distribution of temperature in the room depending on the ambient temperature and the heat input of the considered sources. Main functions of the application are presented by simulation of cyclic heating and cooling of the tested room.

Sustainability, Jul 12, 2017

This paper reports the experimental and simulation analysis of a window system incorporating Phas... more This paper reports the experimental and simulation analysis of a window system incorporating Phase Change Materials (PCMs). In this study, the latent heat storage material is exploited to increase the thermal mass of the building component. A PCM-filled window can increase the possibilities of storage energy from solar radiation and reduce the heating cooling demand. The presented measurements were performed on a specific window panel that integrates a PCM. The PCM window panel consists of four panes of safety glass with three gaps, of which the first one contains a prismatic glass, the second a krypton gas, and the last one a PCM. New PCM window panel technology uses the placement of the PCM in the whole space of the window cavity. This technology improves the thermal performance and storage mass of the window panel. The results show the incongruent melting of salt hydrates and the high thermal inertia of the PCM window panel. The simulation data showed that the PCM window panel and the double glazing panel markedly reduced the peak temperature on the interior surface, reduced the air temperature inside the room, and also considerably improved the thermal mass of the building. This means that the heat energy entering the building through the panel is reduced by 66% in the summer cycle.

Trendy ve vzdělávání, 2012

Department of Mathematics of the Faculty of Applied Informatics of the Tomas Bata University in Z... more Department of Mathematics of the Faculty of Applied Informatics of the Tomas Bata University in Zlin has been dealing with the modern trends at teaching of mathematical subjects. In the submitted paper we are going to bring out a visual web presentation integrating text, figure and 3D animation which should innovate the Mathematics II subject. The visual web presentation will be placed for the disposal of general public on the Faculty of Applied Informatics of Tomas Bata University in Zlin server after its completing. The students of our university, especially the students in combined form of study, highly appreciate teaching with visual web presentation. Therefore we are convinced that also students of other universities, including those in distance study, can make use of this web presentation for reasons of its universality, usefulness and eye-appeal.Ministry of Education, Youth and Sports of the Czech Republic [504

WSEAS transactions on heat and mass transfer, 2017

The paper deals with the use of computer tools for assessing of the thermal stability of building... more The paper deals with the use of computer tools for assessing of the thermal stability of buildings. It describes the procedure developed for determining of a time constant for cooling down of the room and a coefficient α whose values are related to the building's thermal-accumulation properties. The developed methodological procedure is based on processing of the data obtained by measuring in the real building object, computer simulations in COMSOL Multiphysics software and subsequent processing of the output data in MAPLE and MATLAB software with regard to compliance with valid European and Czech technical standards used in building industry and Architecture. The studied model of the room showed the dependence of the time constant and the coefficient α on thickness and specific heat capacity of the thermal insulation of the external wall under the selected winter conditions. The studied example also proved correlation between the coefficient α and the time constant of the room.