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Image noise reduction method based on discrete wavelet transform
Holiš, Michal ; Přinosil, Jiří (referee) ; Malý, Jan (advisor)
This bachelor's thesis contains theoretical treatise on noises, which occur in digital visual data, their classification and possibilities of their removal. The next part is applied to theory of wavelets, wavelet transforms and their usage in working with one-dimensional, but mostly with two-dimensional signals. It is than mainly applied on visual data with a view to removing of failures contained in these data. The last part of the thesis is about implementation of demonstrational programme. This programme is created for removing of noise from the chosen visual data on the basis of user's chosen variables.
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Statistic evaluation of chosen investment funds
Mitrengová, Anna ; Odehnalová, Bohumila (referee) ; Kropáč, Jiří (advisor)
It exists a lot of ways, how to value our money. One of them is its investing to investment funds. But nowadays it is difficult for us to choose in such a big supply of the funds. That is why a lot of investors ask their financial advisors who are able to help them with the choice Everyone who is interested in coffers investing would surely appreciate some well arranged investment fund comparison which would help him/her in quick decision to which of these funds entrust the money for a time. By this bachelor thesis I try to create right such summary. I hope I will help to make the whole investment procedure effective beginning with the choice of the right investment fund.
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Productivity Analysis of Králík's Bakery Using Time Series
Šimková, Marcela ; Pokorný, Petr (referee) ; Kropáč, Jiří (advisor)
The purpose of this Bachelor thesis is to come up with an in-depth efficiency analysis of Kralik's bakery by means of using time series. The intput data set is entirely based on references which were obtained directly from the bakery. Main intention is therefore concentrated on drawing up an analysis that will be used for prediction of production factors in a future. This will consequently lead to better optimization of production plans.
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Parallelization of Ultrasound Simulations Using 2D Decomposition
Nikl, Vojtěch ; Dvořák, Václav (referee) ; Jaroš, Jiří (advisor)
This thesis is a part of the k-Wave project, which is a toolbox for the simulation and reconstruction of acoustic wave felds and one of its main contributions is the planning of focused ultrasound surgeries (HIFU). One simulation can take tens of hours and about 60% of the simulation time is taken by the calculation of the 3D Fast Fourier transforms. Up until now the 3D FFT has been calculated purely by the FFTW library and its 1D decomposition, whose major limitation is the maximum number of employable cores. Therefore we introduce a new approach, called the 2D hybrid decomposition of the 3D FFT (HybridFFT), where we combine both MPI processes and OpenMP threads to reach as best performance as possible. On a low number of cores, on the order of a few hundreds, we are about as fast or slightly faster than FFTW and pure MPI 2D decomposition libraries (PFFT and P3DFFT). One of the best results was achieved on a 512^3FFT using 512 cores, where our hybrid version run 31ms, FFTW run 39ms and PFFT run 44ms. The most significant performance advantage should be seen when employing around 8-16 thousand cores, however we haven't had an access to a machine with such resources. Almost a linear scalability has been proven for up to 2048 employed cores.
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Neuromuscular control of motor units in strength and coordination dependant tasks for lower limbs
Šádek, Petr ; Otáhal, Jakub (advisor) ; Ravnik, David (referee) ; Vláčilová, Ivana (referee)
Title: Neuromuscular control of motor units in strength and coordination dependent tasks for lower limbs. Objective: To compare muscle activity on the level of motor units through decomposition of surface electromyography signal from vastus medialis during given strength and coordination oriented movement tasks and to describe eventual differences in the parameters of tracked motor units in regards to given movement tasks. To assess the quality of chosen method for describing the muscle activity control on the level of motor units for further possible applications in the research and clinical environment. To summarize relevant knowledge acquired through the decomposition method of surface electromyography signal regarding the control of movement, motor unit activation and other relevant informations for clinical environment. Method: Theoretical part of the work presents the decomposition method, the process of its evolution and its constituent parts in the context of electromyographic evaluation of muscles along with selected chapters of neuromuscular kinesiology on the level of motor units. The experimental portion of presented thesis was carried out on 12 probands in the age of 23,2 (+- 5,3) years, who were instructed to perform the selected movement tasks of single leg squat in two different...
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Premature mortality in selected developed countries: causes and trends
Dostál, Martin ; Burcin, Boris (advisor) ; Hulíková Tesárková, Klára (referee)
Premature mortality in selected developed countries: causes and trends Abstract The main goal of the thesis is to describe the overall development of premature mortality and evaluate the development of mortality according to selected groups of causes of death and age groups in selected developed countries of Europe between the years 1999 and 2018. The selected countries for work purposes include the Czechia, Hungary, Sweden, Italy and France. The limit of premature mortality is the age of 70 years. The methods used in this thesis are direct standardization and bivariate decomposition. The results of the analysis showed an improvement in mortality rates in all selected states during almost the entire monitored period. This is proven, for example, by the improvement of the temporary life expectancy between the exact ages of 0 and 70 years. The positive development of premature mortality was mainly contributed by an improvement in mortality from diseases of the circulatory system in older age groups and an improvement in mortality from neoplasms. Key words: premature mortality, causes of death, decomposition, developed countries, Europe
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Role of microbes in the decomposition in headwater streams.
Kociánová, Petra ; Kopalová, Kateřina (advisor) ; Tátosová, Jolana (referee)
The decomposition of organic matter in headwater streams is a key process in stream ecology and an important component of the global carbon cycle. Decomposition rates depend on both abiotic and biotic factors, the former including temperature, discharge, and nutrient chemistry, and the latter including stream community structure and activity, trophic interactions, biodiversity, and productivity. Of the stream community, microbial decomposers play a particularly important role in decomposition by chemically degrading compounds and transferring nutrients and energy to higher trophic levels. These processes are prone to change due to current and future global warming which will affect both decomposer communities and associated decomposition rates. This thesis provides a short overview of the main factors that control stream decomposition rates, including biological factors like microbial activity, abiotic factors such as water temperature and nutrient availability, and how these factors may be altered in the future under a warmer climate. Specifically, I predict that climate change will increase microbial activity and decomposition in headwater streams due to increased water temperatures, changes in surrounding vegetation, and shifts in the hydrological regime due to global warming. .
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Trends in stroke mortality in Czechia in the period 1995-2021
Prystaszová, Adéla ; Kulhánová, Ivana (advisor) ; Lustigová, Michala (referee)
Stroke is one of the most common causes of death in Czechia. The aim of this bachelor's thesis is to analyse trends in stroke mortality between 1995 and 2021 using data from the Czech Statistical Office. Standardized mortality rates, age-specific mortality rates, simple proportion calculations and two-dimensional decomposition method were used for this purpose. The thesis describes a significant decrease in the overall intensity of stroke mortality and intensity by age groups, as well as notable impact of stroke on the increase in life expectancy at birth. Furthermore, the thesis examines changes in the position of stroke among other causes of death, including cardiovascular diseases. The regional differentiation of stroke mortality is also analysed, revealing significant internal variability within Czechia. Additionally, the mortality trends of two main stroke types, ischaemic and haemorrhagic, are briefly outlined. Analysis of differences between men and women is included throughout the whole thesis. Keywords: mortality, stroke, standardized mortality rates, decomposition, Czechia Trends in stroke mortality in Czechia in the period 1995-2021
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Hodnocení biologicky rozložitelných materiálů v modelových podmínkách skládky, kompostu a půdě
Zourková, Andrea
The thesis focused on biologically degradable materials. It describes legal environment of the Waste management in the Czech Republic, charakteristice and structuring of biodegradable waste. Furthermode it deals with the usage of materials in various sectors and finally the elimination of biodegradable materials. The practical part examined the information about plastic cups for beveranges saying the were one hundred per cent compostable and biodegradable. Four types of the cups were chosen, placed and observed in polystyrene boxes according to the methodology to simulate the conditions of dump, compost and soil, for six moths. The results was following: two types of plastic cups were partly decomposed and the other two types were not changed at all.
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Decomposition of the gender wage gap before and after COVID-19: did wage determinants across genders change?
Bartóková, Martina ; Pertold-Gebicka, Barbara (advisor) ; Kolář, Daniel (referee)
The topics of inequality, unconditional differences or disproportional rewarding systems are fighting for their place at the top of the interest in public life. In order to fight the inequality present in society, scientists, policymakers, publicly active people and ordinary people are trying to discuss it and find its leading causes. This thesis examines the inequality between men and women in the rewarding system and how the recent pandemic crisis influences it. We analyse the role of many wage gap determinants and try to identify the main ones and how they change with the COVID-19 pandemic. Some of our expectations were confirmed. The pandemic crisis put more burden on women than men. However, the research shows that all the economic sectors suffer from the pandemic; the only difference is by what amount. The results of the decomposition show that change in the determinants of the wage gap is present, but only on the border of the gap. The reason is that even before the pandemic outbreak, the most significant part of the gender wage gap (GWG) was caused by the unexplained gap, i.e., the possible reasons for the GWG are gender discrimination or gender specialisation. After the COVID-19 pandemic began, the unexplained gap strengthened its position. Keywords gender, gender wage gap, COVID-19,...
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