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Přepis aplikace Gisella s využitím moderních technologií
Zelenka, Ondřej
This diploma thesis deals with the creation of a new Gisella mobile application, which is a rewrite of the old application of the same name on the Android platform. The application was originally created by team Spatial Hub and is managed by ENVIPARTNER s.r.o. The goal of the work was to implement a new application that will have the same functionality as the old application, but in a new language, architecture and using the latest technologies so that it can be better managed and possibly expanded in the near future. The work will start with the theoretical part, which includes, among other things, the Android platform, the Kotlin language and its new toolkit Jetpack Compose, Dependency injection using the Koin library, the MVVM architecture and others. This will be followed by a short analysis of the possibilities of rewriting the application from Java to Jetpack Compose, the implementation procedure using the design in the theoretical part, examples of implementation and an evaluation of the success of the rewrite.
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Mobilní aplikace pro vyhledání bodů z archivu geodetické firmy a jejich zobrazení
Zelenka, Ondřej
This bachelor thesis deals with the creation of a mobile application for a surveying company written for the Android platform. The aim of this thesis was to implement an application, that will help the company display measuring points from the archive contracts on the map and find out information about them. The thesis first deals with the Android platform, the Kotlin language, coordinate reference systems, current applications and then the implementation of application design using selected tools. Thesis also includes the implementation of a web application used to upload data to the Firebase database.
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Dynamics of spinning test particles in curved spacetimes
Zelenka, Ondřej ; Loukes Gerakopoulos, Georgios (advisor) ; Witzany, Vojtěch (referee)
The motion of a test particle in the Schwarzschild background models the merger of a compact object binary with extremely different masses known in the literature as Extreme Mass Ratio Inspiral. In the simplest geodesic approxima- tion, this motion is integrable and there is no chaos. When one takes the spin of the smaller body into account, integrability is broken and prolonged resonances along with chaotic orbits appear. By employing the methods of Poincaré surface of section, rotation number and recurrence analysis we show for the first time that there is chaos for astrophysically relevant spin values. We propose a uni- versal method of measuring widths of resonances in perturbations of geodesic motion in the Schwarzschild spacetime using action-angle-like variables. We ap- ply this novel method to demonstrate that one of the most prominent resonances is driven by second order in spin terms by studying its growth, supporting the expectation that chaos will not play a dominant role in Extreme Mass Ratio Inspirals. Last but not least, we compute gravitational waveforms in the time- domain and establish that they carry information on the motion's dynamics. In particular, we show that the time series of the gravitational wave strain can be used to discern regular from chaotic motion of the source. 1
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Chaotic motion in the Johannsen-Psaltis spacetime
Zelenka, Ondřej ; Lukes-Gerakopoulos, Georgios
The Johannsen-Psaltis spacetime is a perturbation of the Kerr spacetime designed to avoid pathologies like naked singularities and closed timelike curves. This spacetime depends not only on the mass and the spin of the compact object, but also on extra parameters, making the spacetime deviate from Kerr. In this work we consider only the lowest order physically meaningful extra parameter. We use numerical examples to show that geodesic motion in this spacetime can exhibit chaotic behavior. We study the corresponding phase space by using Poincaré sections and rotation numbers to show chaotic behavior, and we use Lyapunov exponents to directly estimate the sensitivity to initial conditions for chaotic orbits.
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Chaotic motion in Johannsen-Psaltis spacetime
Zelenka, Ondřej ; Loukes Gerakopoulos, Georgios (advisor) ; Kopáček, Ondřej (referee)
The Johannsen-Psaltis spacetime is a perturbation of the Kerr spacetime de- signed to avoid pathologies like naked singularities and closed timelike curves. This spacetime depends not only on the mass and the spin of the central object, but also on extra parameters, making the spacetime deviate from Kerr; in this work we consider only the lowest order physically meaningful extra parameter. In this thesis we summarize the basics of the theory of regular and chaotic dynamics and we use numerical examples to show that geodesic motion in this spacetime can exhibit chaotic behavior. We study the corresponding phase space by using Poincaré sections and rotation numbers to show chaotic behavior both directly and indirectly (e.g. Birkhoff chains), and we use Lyapunov exponents to directly estimate the sensitivity to initial conditions for chaotic orbits. 1
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Consumers' attitudes to various forms of retail sale
ZELENKA, Ondřej
The opening part of this work is focused on the literary research, especially, it defines forms of retail sales and their specifics, consumer behaviour, attitudes to consumer behaviour. also describes development of retailing in area of the Czech republic. The trends of retailing are enclosed in the literary research. The second part of this work includes results of the research of consumers' attitudes toward various forms of retail sales. The main goal of this thesis is to explore the development of shopping behaviour in the context of the development of retail sales. The recommendations for traders are designed at the end of this thesis.
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Consumers' attitudes in the Field of the Responsible Consumption
ZELENKA, Ondřej
The opening part of the bachelor´s work is focused on the literary research, specifically, it defines the basic concepts of consumer behaviour, attitudes to consumer behaviour and aspects that could affect it. Furthermore it is followed by a discussion of the attitudes of consumers, forming the attitudes and their possible changes. jThe characteristics of responsible consumption and buying are enclosed in the literary research. The practical part of this thesis includes the results of the research of consumers' attitudes in the field of responsible consumption based on a questionnaire. The aim is to suggest possible methods for producers and traders in the case of consumers' attitudes. Finally, the specific methods for producers and traders are designed.
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