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Three-Phase Inverter for High Speed Induction Motor
Veselý, Petr
This work deals with designing a power part of a three-phase inverter for induction motor. It contains choosing of some important parts such as IGBT modules or drivers, which depends on parameters, that are mentioned or calculated. Also a schema is included. General principle and brief theory is described in this paper too.
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Design and simulation of interior permanent magnet synchronous machine
Veselý, Petr ; Vlach, Radek (referee) ; Ondrůšek, Čestmír (advisor)
The master’s thesis deals with the design of a synchronous motor with embedded magnets. First of all, the general theory of synchronous motor, which is focused on field-weakening drive, is described. Then a 6-pole and a 8-pole version of the motor with embded magnet, which has 65 kW and 3000 rpm is complexly designed. Motors are compared with each other and with a motor with surface magnets, that was also designed in this work. Finally, all motors are compared with a mafufactured and measured motor.
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Nové metody ve schvalování úvěrů
Rychnovský, Michal ; Arlt, Josef (advisor) ; Pecáková, Iva (referee) ; Veselý, Petr (referee)
This thesis contributes to the field of applied statistics and financial modeling by analyzing mathematical models used in retail credit underwriting processes. Specifically, it has three goals. First, the thesis aims to challenge the performance criteria used by established statistical approaches and propose focusing on predictive power instead. Secondly, it compares the analytical leverage of the established and other suggested methods according to the newly proposed criteria. Third, the thesis seeks to develop and specify a new comprehensive profitability-based underwriting model and critically reflect on its strengths and weaknesses. In the first chapter I look into the area of probability of default modeling and argue for comparing the predictive power of the models in time rather than focusing on the random testing sample only, as typically suggested in the scholarly literature. For this purpose I use the concept of survival analysis and the Cox model in particular, and apply it to a real Czech banking data sample alongside the commonly used logistic regression model to compare the results using the Gini coefficient and lift characteristics. The Cox model performs comparably on the randomly chosen validation sample and clearly outperforms the logistic regression approach in the predictive power. In the second chapter, in the area of loss given default modeling I introduce two Cox-based models, and compare their predictive power with the standard approaches using the linear and logistic regression on a real data sample. Based on the modified coefficient of determination, the Cox model shows better predictions. Third chapter focuses on estimating the expected profit as an alternative to the risk estimation itself and building on the probability of default and loss given default models, I construct a comprehensive profitability model for fix-term retail loans underwriting. The model also incorporates various related risk-adjusted revenues and costs, allowing more precise results. Moreover, I propose four measures of profitability, including the risk-adjusted expected internal rate of return and return on equity and simulate the impact of the model on each of the measures. Finally, I discuss some weaknesses of these approaches and solve the problem of finding default or fraud concentrations in the portfolio. For this purpose, I introduce a new statistical measure based on a pre-defined expert critical default rate and compare the GUHA method with the classification tree method on a real data sample. While drawing on the comparison of different methods, this work contributes to the debates about survival analysis models used in financial modeling and profitability models used in credit underwriting.
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The Court of Justice of the European Union: the engine of integration?
Veselý, Petr ; Plechanovová, Běla (advisor) ; Parízek, Michal (referee)
This thesis deals with the topic of influence of the Court of Justice of the European Union on the process of European integration. For this purpose, the thesis asks the following question: "How has the Court of Justice of the European Union in selected cases contributed to the strengthening of European integration?" After an overview of the methodological basis, the thesis thoroughly examines the main theoretical approaches and authors that focused on the topic of Court of Justice and its influence on European integration: neofunctionalism, intergovernmentalism, neorationalism, supranationalism and legalistic approach. In the third part, five landmark cases of the ECJ have been chosen for detailed analysis: Van Gend en Loos, Costa vs. E.N.E.L., Internationale Handelsgesellschaft, Les Verts and Francovich. The thesis not only maps the political situation surrounding their announcement, but also the aftermath, consequences and reactions of member states to the judgements. In its last part, the thesis attempts to connect the theoretical approaches with the findings of the aforementioned analysis of landmark decisions. The thesis concludes that the Court of Justice in fact did contribute to the strengthening of European integration, namely by establishing the principles of direct effect, superiority...
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Role of individual chemical compounds of repellent secretion of Graphosoma lineatum towards different predator species
Gregorovičová, Martina ; Horáček, Ivan (advisor) ; Veselý, Petr (referee) ; Zápotocký, Martin (referee)
The chemical defence of Heteroptera is based on the repellent secretion that is very complex and consists of dozens chemical compounds. Heteroptera have good ability to produce/store large amounts of chemical components. The repellent secretion of Graphosoma lineatum is composed of many chemicals, such as short-chained aldehydes, which may signal the unpalatability of the bug to its potential predators or be directly toxic for them. The thesis is aimed at the major components of defensive secretion of Graphosoma lineatum - aldehydes - as well as the whole metathoracic scent-glands secretion of Graphosoma lineatum. The aversive reactions of four selected predators were evaluated: (1) leopard gecko (Eublepharis macularius); (2) green lizard (Lacerta viridis); (3) great tit (Parus major) and (4) blue tit (Cyanistes caeruleus). The following major compounds of the repellent secretion were tested: (1) the mixture of three aldehydes: (E)-hex-2-enal, (E)-oct-2-enal, (E)-dec-2-enal; (2) the mixture of three aldehydes and tridecane; (3) oxoaldehyde: (E)-4-oxohex-2-enal; (4) extracted metathoracic scent-glands secretion of Graphosoma lineatum adults; (5) hexane as a non-polar solvent and (6) pyrazine: 2-isobutyl-3-methoxypyrazine in experiments with leopard geckos as a positive control for excluding the...
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Comparison of individual's performance in a discrimination tasks with respect to the hierarchy status
Kocourková, Zuzana ; Landová, Eva (advisor) ; Veselý, Petr (referee)
The ability to discriminate stimuli is the most tested cognitive task in pigeons (Columbia livia f. domestica) within up to now published experiments. Up to now, the influence of personality traits on discrimination has been poorly studied. This thesis looks into the differences in success between individuals and discrimination tasks, and analyzes factors including personality traits influencing the success rate. In this experiment, the total of 72 individual pigeons were tested in four linked tasks: 1) discrimination of black and white screen in the Skinner's box, 2) discrimination of black and white circle patch in the Skinner's box, 3) discrimination of black and white lid in a cage and 4) discrimination of reduced black and white stimuli, placed on a lid, in the cage. The criterium of success was set on 80%. In the Skinner's box, the task were passed by lower number of individuals (6% in first, 20% in second) in comparsion with the cage (48% in third and 50% in fourth). The tasks differed in environment and size of stimuli. It has been determined, that te tested subjecs were able to generalise in the Skinner's box, with an expception when the stimuli was reduced. While testing, all factors that might have influenced the success rate were observed. It has been proved, that the success rate was...
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Experimental research of specificity of fear of snake: coral snake pattern
Průšová, Lucie ; Frynta, Daniel (advisor) ; Veselý, Petr (referee)
Due to shared coevolutionary history of snakes and primates with snakes acting as their main predators, snakes elicit fear in most of the primates, humans included. Humans are able to notice a stimulus that elicits fear, e.g., a snake, much faster. Such ability might have surely positively affected their survival in the past. In the nature, aposematic coloration acts as a warning of a dangerous prey to its predators not to devour it. The highly poisonous American coral snakes have this coloration pattern. The harmless king snakes of the Central and North Americas gain an anti-predatory advantage by becoming the coral snakes 'Batesian mimics, copying their bright pattern. Such pattern elicits an innate fear reaction in various species of wild birds who avoid a mere contact with patterned plastic dummies. The question arises whether other taxa, including primates and humans, generally recognize such pattern as dangerous. The aim of this study was to find whether humans fear coral snakes, although they have not long coevolutionary history with them. Further it was analyze, which visual factors of the snakes affect this fear reaction (i.e., a warning coloration, pattern or shape of snake). The atractiveness of these snakes was tested. Another question was whether humans are able to intuitively recognize...
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Design turbines to combined cycle
Veselý, Petr ; Kracík, Petr (referee) ; Fiedler, Jan (advisor)
The topic of thesis is condensing turbine in gas-steam cycle, which can be divided into four basic parts. A history of gas-steam cycle is described in the beginning. Second part is all about calculation of heat recovery steam generator. Penultimate section deals with calculations of steam turbine parameters and reaction blading type. Last part contains electric power and steam turbine efficiency.
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Cognition test for testing object permanence in birds and primates
Marhounová, Lucie ; Landová, Eva (advisor) ; Veselý, Petr (referee)
Object permanence is a cognitive ability to mentally represent the existence and the movement of hidden objects. This phenomenon is being developed since birth in six different stages following the development of the sensorimotor intelligence. Not only the humans but also the other animals possess a certain notion of hidden objects and acquire various degrees of this ability depending on their life strategies. This thesis summarizes the research conducted up to the present in the field of the object permanence within the infant developmental psychology, but particularly in the animal world with the emphasis on the taxa where this ability has been most researched, that is in primates and birds. This thesis also recapitulates the types of the cognitive tasks used in the object permanence research and compares the methods of experiments applied to the humans, the primates and the birds. Part of this thesis also involves a phylogenetic reconstruction estimate of the ancestral character status in terms of the object permanence and testing the progress dependance of such character in relation to the selected ecological factors in primates.
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Antipredatory reaction of leopard gecko Eublepharis macularius to snake predators
Musilová, Veronika ; Landová, Eva (advisor) ; Veselý, Petr (referee)
4 ABSTRACT If there is an innate, specific idea of the natural animal predator, antipredatory reactions should occur even the subjects are kept in captivity for several generations. An ideal subject for this type of research is the leopard gecko (Eublepharis macularius), an animal which is kept in captivity for several generations (there are also several wild subjects in our laboratory). Its primary enemy in rural Pakistan is the snake. The goal of this thesis was to explore the leopard gecko's antipredatory behaviour, to the snake predators combining sympatric and alopatric behaviour, to other ecological factors. The predators are: Spalerosophis diadema (sympatric, reptile-vorous), Elaphe q. quatuorlineata (allopatric, prefers warm-blooded chordates, but also reptile- vorous), Hemorrhois hippocrepis (allopatric, lizards are its main prey), Lampropeltis getula californiae (alopatric, reptile-vorous), Eryx johnii (sympatric, eats young rodents and reptile), Gongylophis colubrinus (allopatric, eats young rodents and reptile) and Malpolon monspessulanus (allopatric, is moderately dangerous for leopard geckos). As an control was chosen Pseudopus apodus (native to Iran, eats invertebrates, small rodents and reptile). Sampling tests were performed with these leopard geckos. It was observed if the subject prefers...
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