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Power line channel simulator
Jedlička, Tomáš ; Fujdiak, Radek (referee) ; Mlýnek, Petr (advisor)
The master’s thesis is focused on the analysis and modeling of power line communication with aim to implement power line channel simulator in the programming environment Matlab. At the beginning of the thesis are summarized basic information about the PLC communication, its basic distribution in terms of frequency bands and are also mentioned advantages and disadvantages. The emphasis on the meaning and importance of modeling with the aim to analyze PLC communication channel is specified further. The following is a detailed description of the current power lines communication models. Power line channel simulator was created on the basis of mathematical analysis for low-voltage (LV) distribution networks. The created simulator uses a model of cascaded two-ports and works in random or fixed mode. Input parameters are real topologies, different types of loads and cables. RLC resonant circuit as a frequency selective impedance is also included in impedance models. Based on the obtained results was performed the analysis, determined the critical parameters and extreme values. Comparison of effectiveness of created simulator was processed on the basis of available simulators from other authors. Two versions of simulator were created using the results obtained under comparison of effectiveness. For comparison was also performed real measurement on a simple topology. The experimental measurements results have been implemented in the simulator.
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Current possibilities of data communication via the power network
Jedlička, Tomáš ; Mišurec, Jiří (referee) ; Mlýnek, Petr (advisor)
This thesis is focused on processing, summary information about PLC commnunication and analyzing present issue of data transfer via powerline grids. Teoretic and technical information about PLC communication, advantages, disadvantages, kinds of PLC communication depending on used frequency ranges and also about used modulation techniques are processed in the first part of the thesis. The second part of thesis is focused on analysis information about choice types of modems and companies, which are oriented on PLC technology. Measurements results of broadband PLC communication are evaluated in the third part of thesis with opportunity to extend and modification it. Laboratory measurement of narrowband PLC communication is processed and focused in this part on transmission speed and spectrum of signal. Results of measurement in company ModemTec are summarized in the end of thesis.
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Science-Oriented Courses of the University of the Third Age from the Perspective of Their Participants
Jedlička, Tomáš ; Mourek, Jan (advisor) ; Andreska, Jan (referee)
Factors affecting the motivation to study natural sciences are intensively researched. However, most authors focus on younger age groups of the population, especially primary and secondary school students. On the other hand, in my rigorous work and published article, I focused on the education of seniors. Their interest-based education at retirement age is becoming more and more important, as the population in the Czech Republic is aging overall. Using semi-structured interviews with eight participants in science-oriented university courses for the third age at the Faculty of Science of Charles University, I tried to find out the factors that motivate seniors to study and I asked them how they evaluate the courses, which they attend. I carried out the research in my diploma thesis (Jedlčka, 2018) and subsequently published in the journal Bioolgie-chemie-zeměpis (Jedlička and Mourek, 2023). In the author's commentary, I place the issue of the university of the third age and the participants in their courses in the context of the covid-19 pandemic, which significantly changed the course of the university of the third age. In the commentary, I also address the seniors themselves, who were significantly affected by the pandemic, and not only in terms of health. The author's commentary, together with...
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Interpretation of WWII in Novels of Authors in Exile after February 1948 - Oblak a valčík of Ferdinand Peroutka and Dvorní šašci of Viktor Fischl
JEDLIČKA, Tomáš
This bachelor thesis deals with the interpretation of two novels, one written by Ferdinand Peroutka, Oblak a valčík, and the other by Viktor Fischl, Dvorní šašci. The core theoretical framework of this thesis is based on the methodological basis provided by Paul Ricoeurs's books Time and Narrative and Oneself as Another, and Hayden White's Tropics of Discourse and Metahistory. The interpretation mainly focuses on the representation of characters of victims of the Second World War, and Holocaust respectively. The last chapter itself contextualises the novel and puts it into the particular context of Czech exile literature, and relates particular authorial strategies found in these novels to the sociopolitical thinking of their respective authors.
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Water use efficiency (WUE), its definition and importance in plant resistance against osmotic stress
Jedlička, Tomáš ; Hála, Michal (advisor) ; Lhotáková, Zuzana (referee)
Water is one of the main limiting factors of plant growth. Availability of water on our planet is decreasing, and if we add fast-growing human population, we have a problem growing. Scientists from all around the world, especially those from arid regions, are facing a big problem, which is an attempt to make the most efficient use of water by plants. If this problem should be solved, we need to understand the issue of Water Use Efficiency (WUE). This paper attempts to summarize the current knowledge related to the issue of WUE, mainly focused on anatomical and physiological parameters control of WUE, which is focused primarily on the issue of evapotranspiration. Another part focuses on clarifying the issue of WUE at the gene level and the related biotech opportunities. At the end of the work are discussed possibilities of increasing WUE using irrigation techniques. Key words: water use efficiency, evaporation, transpiration, stoma, stomatal density, abscisic acid, ERECTA
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Utilizing HLA for agent based development platforms
Jedlička, Tomáš ; Plch, Tomáš (advisor) ; Bednárek, David (referee)
The High Level Architecture (HLA) provides a universal solution for interconnecting various simulation environments and applications thus creating a more complex simulation entity. The idea is built upon controlled and directed data exchanges of objects and events (via the RunTime Interface - RTI) shared by participants (i.e. simulations) thus creating a distributed data environment. The aim of this thesis is to investigate usability of HLA for agent based development platforms (e.g. Pogamut) as well as providing transparent and simple to use access to HLA for HLA unaware applications. The thesis describes architecture and provides a prototype proof-of-concept implementation, which integrates HLA with two different (closed source) game engines providing them the ability to communicate to a simple client application according to a reasonable subset of the HLA standard. The thesis also provides performance measurements of prototype implementation.
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Personality and motivation of participants in the senior university courses
Jedlička, Tomáš ; Mourek, Jan (advisor) ; Janštová, Vanda (referee)
The population of the Czech republic is getting older. That applies to other European states, including the most advanced ones. In response to that, universities through out the Czech republic have began offering third age university for senior citizens. For my thesis, I decided to conduct studies on this group of inviduals. This group of seniors that have decided to enroll back in school are eager to learn something new, here at the University. In this thesis I am studying personality characteristics of third age university students. From this research, I have managed to create a general profile of the aforementioned student. Another task was to find out what was the motivation and the reason for them to attend the university. The motivation is in many respects similar to the studies already carried out on this topic, but due to the method I chose for my research, I was able to get further under the surface. The research was done using semi-structured interviews that were on average 1 hour long. Key words: old adult, university of the third age, old adult motivation, qualitative research, profile of student U3A
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Water use efficiency (WUE), its definition and importance in plant resistance against osmotic stress
Jedlička, Tomáš ; Hála, Michal (advisor) ; Lhotáková, Zuzana (referee)
Water is one of the main limiting factors of plant growth. Availability of water on our planet is reduced, and if we add fast-growing human population, we have a problem brewing. Scientists from all around the world, especially those from arid regions, are facing a big problem, which is an attempt to make the most efficient use of water by plants. If this problem should be solved, we need to understand the issue of Water Use Efficiency (WUE). This paper attempts to summarize the current knowledge related to the issue of WUE, mainly focused on anatomical and physiological parameters control of WUE, which is focused primarily on the issue of evapotranspiration. Another part focuses on clarifying the issue of WUE at the gene level and the related biotech opportunities. At the end of the work are discussed possibilities of increasing WUE using irrigation techniques.
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