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Data mining
Mrázek, Michal ; Sehnalová, Pavla (referee) ; Bednář, Josef (advisor)
The aim of this master’s thesis is analysis of the multidimensional data. Three dimensionality reduction algorithms are introduced. It is shown how to manipulate with text documents using basic methods of natural language processing. The goal of the practical part of the thesis is to process real-world data from the internet forum. Posted messages are transformed to the numerical representation, then to two-dimensional space and visualized. Later on, topics of the messages are discovered. In the last part, a few selected algorithms are compared.
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Strain stress analysis of proximal tibia end with replacement
Tekalová, Soňa ; Mrázek, Michal (referee) ; Florian, Zdeněk (advisor)
This thesis deals with stress analysis strain proximal end of tibia with total joint replacements. The analysis is done on the basis of deformation characteristics of voltage, through the finite element method (FEM). We have developed two-dimensional models of the proximal end of tibia with tibial components total endoprosthesis (TEP), without loss and bone loss. Geometry model is created based on data obtained from computerized tomography, which were further processed in the program, Rhinoceros 3.0 and SolidWorks 2009th Computational solution was carried out by finite element method in Ansys Workbench 12.0. The model without loss of bone tissue was tested the hypothesis that the deformation is very small and there is no violation of the shank prosthesis. Due to loss of bone tissue is lost support to the tibial pulse in the proximal tibia and by a progressive increase in stress, which can lead to a breach of the shank total joint replacement. The analysis results show that, if the loss of bone tissue, so that the tibial part of the TEP will lose support, there is a crack stem total hip replacement due to stress.
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Explanation of the sloshing motion in a tank, for a moving tank, for a fixed tank
Mrázek, Michal ; Habán, Vladimír (referee) ; Fialová, Simona (advisor)
This bachelor's thesis deals with mathematical model of sloshing in a tank. Laplace's equation is developed. Boundary conditions for a still rectangular container and for a container under sinusoidal translation are established. Expressions for the free surface elevation and natural frequencies in oscillating tank are determined. Baffles are suggested as a method to minimize the free surface elevation. In the final part, analytical model is compared with numerical solution with overall good agreement.
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BIOMECHANICAL STUDY OF EXTERNAL FIXATORS APPLIED TO TIBIA
Mrázek, Michal ; Horyl, Petr (referee) ; Janíček, Přemysl (referee) ; Florian, Zdeněk (advisor)
External fixators are used in a treatment of complicated fractures and their properties have a crucial impact on treatment quality. Therefore, this thesis is concerned with a biomechanical study of a bone (tibia) with applied external fixators via strain-stress analysis and their comparison with a state of tibia without applied fixator (physiological state). After creating the volume models of geometry of tibia and seven variants of external axial fixators, the corresponding finite element method (FEM) models are created. The analysis of tibia without applied fixator and tibia with all studied fixators is made for three states of load which correspond to characteristic load states during the first stage of treatment. The strain-stress analysis is made using finite element method. Furthermore, the methods of displacement and rotation evaluation during loading are proposed. One can conclude from the results of the strain-stress analysis how the different variants of fixators prevent the displacement and rotation of the bone during the different load states and the comparisons with the physiological state of bone are made. Bone tissue loading is determined from the distribution and the values of the first and the third principal stresses. Finally, comparing the results of all variants the influence of the fixator length, the gap between the fixation elements near the fracture, the number and the setting of the fixation elements on the fixation properties is analysed.
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Verification of the original technologies used for art castings
Hřebíček, Lukáš ; Mrázek, Martin (referee) ; Horáček, Milan (advisor)
This diploma thesis is describing making of the same art casting by using different foundry technologies/ moulds (ceramic shell mould, several types of plaster moulds including anhydride gypsum and also natural sand mould). In this thesis there is also description of casting the famous piece of bull from “Byci skala” (Bull Rock). The bull was cast into traditional clay mould which is believed to be the original technology. Also the original shape of the bull casting was reconstructed, i.e. a copy of the original bull casting made. As the main achievement of this work is an overview and comparison of several technologies suitable for making art castings.
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Stress - strain analysis of inferios limb with fixator type Orthofix
Mrázek, Michal ; Fuis, Vladimír (referee) ; Florian, Zdeněk (advisor)
This diploma thesis aims to create a stress strain analysis of Orthofix external fixator applied to lower limb. The introduction summarizes the background research in available scientific publications, targetting the alternatives of treatment, namely application and fixation solutions of long bones. Furthermore parametric models of the fixator and tibia are created in CAD system CATIA. The fixator model enables to create different geometric variations simulating possible fixator settings and moment load in the range of 1-10 Nm. These geometric and loading states of fixator are solved via FEM in ANSYS. Single versions of the states of Orthofix fixator are then subjected to the stress strain analysis.
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Metodika uchovávání předmětů kulturní povahy
Selucká, Alena ; Mrázek, Martin ; Štěpánek, Ivo ; Mazík, Michal ; Grossmannová, Hana ; Jirásek, Pavel ; Holman, Pavel ; Jakubec, Petr ; Fricová, Jana ; Vácha, Zdeněk ; Červenák, Jan ; Dvořák, Martin ; Němec, Václav ; Dušková, Markéta ; Fogaš, Igor ; Bačovský, Jiří
Metodika poskytuje doporučení pro správnou praxi dlouhodobého uchovávání předmětů kulturní povahy v paměťových institucích. Předkládá logickou osnovu zohledňující důležité aspekty související s budovami, jejich vnitřním prostředím, bezpečnostními kritérii a možnými riziky, spojenými se způsoby užívání předmětů kulturního dědictví. Metodika si klade za cíl též ozřejmit možnosti vyhodnocování vhodnosti stavebních objektů pro dlouhodobé ukládání předmětů kulturní povahy i ze strany jejich majitelů či provozovatelů tak, aby bylo možné predikovat jejich vliv na uložené fondy a udržitelnost provozu.
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Heritage process of art and craft techniques of goldsmithing
Bárta, Patrick ; Fexa, Pavel ; Foret, Lukáš ; Jelínek, Jaroslav ; Kroužil, Martin ; Mrázek, Martin ; Rapouch, Karel ; Řezáčová, Eva ; Vaníček, Petr ; Příhoda, Jiří ; Selucká, Alena ; Stöhrová, Pavla ; Šumbera, Andrej
The goal of the heritage process is to provide a comprehensible guide for identifying the most widespread art and craft techniques for the processing of precious metals, their correct description and the setting of appropriate approaches to their preventive and remedial conservation. In the first section, the art and craft techniques of goldsmithing are described in detail, based on the material characteristics of selected metals and their alloys, a description of the techniques themselves in connection with the historical context of their use, including risk factors of damage to artefacts made by these techniques. The terminology used is also supplemented, which is subsequently elaborated in the form of alphabetically ordered keyword lists in the appendices of the heritage process. The second section consists of a set of case studies containing reconstructions of the procedures of selected craft techniques, including examples of surveys of original artefacts verified in museum practice.
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Generative neural networks for sky image outpainting
Mrázek, Matěj ; Šikudová, Elena (advisor) ; Mirbauer, Martin (referee)
Image outpainting is a task in the area of generative artificial intelligence, where the goal is to expand an image in a feasible way. The goal of this work is to create a machine learning algorithm capable of sky image outpainting by implementing sev- eral recently proposed techniques in the field. We train three models, a tokenizer for converting images to tokens and back, a masked generative transformer for performing outpainting on tokens and a super sampler for upscaling the result, all on a dataset of sky images. Then, we propose a procedure that combines the trained models to solve the outpainting task. We describe the results of training each model and those of the fi- nal algorithm. Our contribution consists mainly in providing a working, open-source implementation including the trained models capable of sky image outpainting. 1
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