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Recursive linear models and conditional independence structures
Zouhar, Jan ; Studený, Milan (advisor) ; Hlubinka, Daniel (referee)
Linear recursive systems (LRS) describe linear relationships among continuous random variables (typically, normally distributed ones). Acyclic oriented graphs are used to provide a qualitative description of these relationships. In a different branch of statistics, graphs serve as a means to describe conditional independence (CI) structures in systems of random variables. One of the aims of the thesis is to show that within the class of regular Gaussian distributions, both approaches coincide: for a given acyclic oriented graph, the statistical model of LRS specified by the graph is equivalent to a class of Gaussian distributions with CI structures that accord with the same graph. Furthermore, we generalized some of the relations between a graph of LRS and its CI structure outside the scope of Gaussian distributions. Another focus of the thesis is the relation between the graph of a LRS and the covariances among its variables. We derived a relationship that is analogous to the method of path coefficients which was introduced in the 1920s by the American geneticist Sewall Wright.
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A retargetable code-generator
Zouhar, Jan ; Král, Jaroslav (referee) ; Bednárek, David (advisor)
This work is focusing on a retargetable backend design for a C++ compiler. The backend is composed of two parts: a target architecture description and a code-generator. The architecture description is based on the XML language. A source XML le is an input for XSL templates that generate C++ classes with the architecture's characteristics such as instructions, supported data types, registers, etc. These classes are used by the code generator as a source of information about the target architecture. The code-generator is architecture-independent. The main phases are: instruction selection, instruction scheduling, register allocation, spill-code generation. The generated output is an assembly source code.
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Závislost na ropných výnosech, ceny ropy a měnové kurzy: analýza denních dat
Budkov, Roman ; Zouhar, Jan (advisor) ; Formánek, Tomáš (referee)
This paper studies the relationship between the oil prices and exchange rates of oil exporting countries, in terms of their dependence on oil rents. The study is based on data at the daily frequency over the period 2005-2015. In the first chapter, the data set and basic characteristics of the countries are described. The second chapter represents the econometric framework for the practical section. Applying a vector error correction model mainly produced controversial results. Analysis based on a GARCH approach found a positive relationship between the value of the currencies and the oil prices, although the link with the oil rents dependence is not sufficiently evident. The paper also supports stylized facts, such as a negative relationship between the U.S. dollar value and the oil prices.
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Dimensional Analysis of a Prototype Part Produced by Soft-tooling
Matuška, Jan ; Zouhar, Jan (referee) ; Slaný, Martin (advisor)
This thesis aims to survey contemporary methods of Rapid Prototyping technology, their principle, positives and negatives. Further use of these and other methods for production of forms for small series. The importance of these branches is growing up and it seems, that this trend is going to continue. The practical part of this thesis follows up with manufacturing of Soft Tooling cast and its dimensional analysis.
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3D FDM printer Rebel II and parameters of print
Pištek, Patrik ; Zouhar, Jan (referee) ; Zemčík, Oskar (advisor)
This work deals with a RepRap 3D printer. The introductory chapter describes rebuilding, the reason of the rebuilding and basic components of a 3D printer. The following is a selection of lesser-used materials PETG and nylon. The individual chapters summarized reviews of experimental studies and the types of samples used in the testing of similar machines. Based on this information the author design size and shape of the sample for the second experiment, chosed relevant technological parameters and proposed plan of the experiments. Investigated parameters are temperature of the nozzle and printing speed. Experimental part of this work includes two experiments. In the first experiment, thin-walled objects by width of a single fiber were printed. The surface quality of the fibers was observed under a microscope. The second experiment evaluated the dimensional variations of the samples in dependence on the aforementioned parameters. Samples were scanned at the office 2D scanner and arithmetic mean of surface roughness Ra was measured by roughness meter on the side and top wall of the samples. The results and recommendations of the author are summarized in separate sections. The temperature and speed affected the quality of the surface of extruded fibers. The effect of temperature on the quality of the bond between the fibers has been significant. Print speed heavily influences the dimensional accuracy and deformation of geometric elements of the sample. The effect of temperature on dimensional accuracy was much less pronounced. In discussion part are expressed some ideas for future experiments. The conclusion summarizes all the gains of this work.
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Implementation of 3D RepRap Printer
Sochor, Marek ; Zouhar, Jan (referee) ; Sedlák, Josef (advisor)
The aim of the bachelor thesis is build and verify the functionality of the 3D RepRap printer . The printer will be assembled from normally available parts and also 3D printed parts, becouse its main idea of the RepRap. After verifying the functionality of 3D RepRap printer We print identical part on two types of printers (RepRap 3D printer tand uPrint printer) and to evaluate the overall analysis (financially and physical). The work will be completed evaluation of usability and competitiveness assembled RepRap printer in practice and will be carried out, the technic-economic evaluation.
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Production of a Jig Using Rapid Prototyping Technology
Růžička, Jan ; Zouhar, Jan (referee) ; Sedlák, Josef (advisor)
The subject of this thesis is the design, modeling and manufacturing of complex shaped parts using modern additive technology Rapid Prototyping. The theoretical basis of the work is involved in Rapid Prototyping and CAD systems and their technology, terminology and basic terms. The analytical part is dedicated to the implementation of the design – construction of the model in parametrical software SolidWorks followed with a creation of the part using 3D printer uPrint working on Fused Deposition Modeling method. Conclusion of this work compares this method with CNC machining and evaluates which method is more efficient and more economical.
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Production of Children's Stool for Dental Office Using Fused Deposition Modeling Method
Kyseľová, Barbora ; Zouhar, Jan (referee) ; Sedlák, Josef (advisor)
Bachelor thesis focus on the description of modelling of the children´s stool in the shape of human teeth with regarding use to dental office. Firstly, the thesis gets closer to creating a physical model. It outlines the use of 3D handy scanner and then involving digitizing the necessary adaptation data obtained after scanning premises. Production of the stool will be provided by uPrint 3D printer by using methods Fused Deposition Modeling. It also justifies the benefits achieved by using these methods and technologies in the present. The thesis will be completed by appraising of constructer´s workload to 3D scanner and 3D printer.
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Application of Modern Technologies for Production of Front Part Fastening System Mountaineering Crampons
Samohýl, Lukáš ; Zouhar, Jan (referee) ; Sedlák, Josef (advisor)
The aim this bachelor thesis is a production of prototype front part fastening system mountaineering crampons. In this work will be carried out the design and construction of a new prototype parts using the parametric application SolidWorks. For prototype production front part crampons will be used additive method Fused Deposition Modeling - uPrint 3D printer. Part of the work will be production of silicone moulds front part crampons using vacuum casting system. Silicone mould will be used for casting of a certain number parts from commercially available materials. The work will be finished with technical and economic evaluation of production front part crampons with recommendations and the best economic analysis of alternatives.
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