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The variability of the distribution of pressure forces on the foot with coupling EMG
Semeráková, Nikola ; Kolářová, Jana (referee) ; Koťová, Markéta (advisor)
The bachelor work is focused on the distribution of pressure forces in the area of the foot with support from electromyography. Part of the work deals with the physiology of leg muscles and where the groups of muscles responsible for standing are defined. After that the thesis focuses on postural stability, the foot vault and biomechanical parameters. Additionally, there's the defining of the principles of electromyography and dynamic pavement. Furthermore, the thesis focused on describing how the data is processed, first from elektromyograph and then from dynamic pavement. Finally, there are outcomes from these devices, which are compared and evaluated,there are also partial parameters for electromyography and for the dynamic pavement.
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The variability of the distribution of pressure forces on the foot with coupling EMG
Semeráková, Nikola ; Kolářová, Jana (referee) ; Koťová, Markéta (advisor)
The bachelor work is focused on the distribution of pressure forces in the area of the foot with support from electromyography. Part of the work deals with the physiology of leg muscles and where the groups of muscles responsible for standing are defined. After that the thesis focuses on postural stability, the foot vault and biomechanical parameters. Additionally, there's the defining of the principles of electromyography and dynamic pavement. Furthermore, the thesis focused on describing how the data is processed, first from elektromyograph and then from dynamic pavement. Finally, there are outcomes from these devices, which are compared and evaluated,there are also partial parameters for electromyography and for the dynamic pavement.
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Dectection of brain wakefulness from scalp EEG data with higher order statistics
Semeráková, Nikola ; Ronzhina, Marina (referee) ; Labounek, René (advisor)
Presented master's thesis deals with detection of brain wakefulness from scalp EEG data with higher order statistics. Part of the thesis is a description of electroencephalography, from the method of signal generation, sensing, electroencephraphy, EEG signal artifacts, frequency bands of EEG signal to its possible processing. Furthermore, the concept of mental fatigue and the possibility of its detection in the EEG signal is described. Subsequently, the principles of higher statistical methods of PCA and ICA and the specific possibilities of decomposition of EEG signal are described using these methods, from which the method of group spatial-frequency ICA was chosen as a suitable method for selection of partial oscillatory sources in EEG signal. In the next part there is described a method of acquisition of data, a the suggestion of solution with selected method and a description of the implemented algorithm, that was applied to real 256-lead scalp EEG data captured during a block task focused on subject allertnes. The absolute and relative power of the EEG signal was decomposed. From the achieved results, we observe that the fluctuations of the spatial frequency patterns of relative power (especially for theta and alpha bands) significantly more closely correspond with the change of reaction time and the error of the subjects performing the task. These observations appear to be relatively consistent with previously published literature, and the current study shows that spatial frequency ICA is able to blindly isolate space-frequency patterns whose fluctuations are statistically significantly correlated with parameters (reaction time, error rate) directly flowing from the given task.
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Dectection of brain wakefulness from scalp EEG data with higher order statistics
Semeráková, Nikola ; Ronzhina, Marina (referee) ; Labounek, René (advisor)
Presented master's thesis deals with detection of brain wakefulness from scalp EEG data with higher order statistics. Part of the thesis is a description of electroencephalography, from the method of signal generation, sensing, electroencephraphy, EEG signal artifacts, frequency bands of EEG signal to its possible processing. Furthermore, the concept of mental fatigue and the possibility of its detection in the EEG signal is described. Subsequently, the principles of higher statistical methods of PCA and ICA and the specific possibilities of decomposition of EEG signal are described using these methods, from which the method of group spatial-frequency ICA was chosen as a suitable method for selection of partial oscillatory sources in EEG signal. In the next part there is described a method of acquisition of data, a the suggestion of solution with selected method and a description of the implemented algorithm, that was applied to real 256-lead scalp EEG data captured during a block task focused on subject allertnes. The absolute and relative power of the EEG signal was decomposed. From the achieved results, we observe that the fluctuations of the spatial frequency patterns of relative power (especially for theta and alpha bands) significantly more closely correspond with the change of reaction time and the error of the subjects performing the task. These observations appear to be relatively consistent with previously published literature, and the current study shows that spatial frequency ICA is able to blindly isolate space-frequency patterns whose fluctuations are statistically significantly correlated with parameters (reaction time, error rate) directly flowing from the given task.
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E-commerce Grocery Retailers in the Czech Market
Semeráková, Nikola ; Pešek, Ondřej (advisor) ; Zímová, Aneta (referee)
This bachelor thesis deals with an analysis of online grocery retailers in the Czech market - Tesco Potraviny online, Rohlik.cz, Košík.cz. The thesis is divided into the theoretical and practical part. The theoretical part focuses on the latest trends in e-commerce, e-grocery, buying behaviour of Czech customers on the Internet and marketing strategies. The practical part of the thesis is based on qualitative research in the form of interviews with experts and findings from expert conferences. Results from the information acquired - the purchasing process from a customer and seller, marketing strategies of companies and customer care. Then, through mystery shopping, it was found out which of the grocery retailers best satisfies customer requirements. Mystery shopping results are the source of suggestions and recommendations for monitored e-shops.
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The variability of the distribution of pressure forces on the foot with coupling EMG
Semeráková, Nikola ; Kolářová, Jana (referee) ; Koťová, Markéta (advisor)
The bachelor work is focused on the distribution of pressure forces in the area of the foot with support from electromyography. Part of the work deals with the physiology of leg muscles and where the groups of muscles responsible for standing are defined. After that the thesis focuses on postural stability, the foot vault and biomechanical parameters. Additionally, there's the defining of the principles of electromyography and dynamic pavement. Furthermore, the thesis focused on describing how the data is processed, first from elektromyograph and then from dynamic pavement. Finally, there are outcomes from these devices, which are compared and evaluated,there are also partial parameters for electromyography and for the dynamic pavement.
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The variability of the distribution of pressure forces on the foot with coupling EMG
Semeráková, Nikola ; Kolářová, Jana (referee) ; Koťová, Markéta (advisor)
The bachelor work is focused on the distribution of pressure forces in the area of the foot with support from electromyography. Part of the work deals with the physiology of leg muscles and where the groups of muscles responsible for standing are defined. After that the thesis focuses on postural stability, the foot vault and biomechanical parameters. Additionally, there's the defining of the principles of electromyography and dynamic pavement. Furthermore, the thesis focused on describing how the data is processed, first from elektromyograph and then from dynamic pavement. Finally, there are outcomes from these devices, which are compared and evaluated,there are also partial parameters for electromyography and for the dynamic pavement.
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