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Inverter for DC motor 800 W
Němec, Petr ; Toman, Marek (referee) ; Procházka, Petr (advisor)
The goal of this Bachelor´s thesis is design of an power inverter for BDC motor 36 V/800 W with permanent magnets. The first part of this work is devoted to the brief description of drive elements, which with designed converter create drive system. It´s also contain measures of used BDC motor MY1020. In the second part there is a outline description of functions and connection of DC/DC converters with respect to the final solution. The power circuit will be built with the MOS-FET IRFP4110 connected to the H bridge. Transducer control logic will be provided by the microcontroller development board Arduino UNO 3 with the integrated driver circuit IR2110.
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Optimization of the Production Line Supply Process
Kremzová, Jana ; Němec, Pavel (referee) ; Videcká, Zdeňka (advisor)
The bachelor's thesis deals with the supply process optimization of the production line in the JKVB, s. r. o. company. It is based on the analysis of the supply process and focuses on finding its bottlenecks. As part of the solution, a methodology for determining the optimal amount of material on the line, including its application, is proposed. The whole proposal is evaluated by four criteria. These are return on investment, work productivity, ergonomics and space saving.
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The Fair and True View of Business Unit in the Financial Statements
Němec, Petr ; Ondroušková, Renata (referee) ; Fedorová, Anna (advisor)
The diploma thesis deals with the issue of the fair and true view of business unit in the financial statements. The basic statements of the financial statements comprise the balance sheet, the profit and loss statement and the annexe to the financial statements explaining methods used for accounting of the accounting cases. The practical part of the diploma thesis is focused on analysis of the financial statements of particular entity and applied accounting procedures. The analysis of this unit was carried out focusing on achievement of fair and true view of this unit in the financial statements. The financial position and performance of the selected business unit was evaluated on the basis of selected financial indicators according to the unit's data and its own calculations. The results were compared and evaluated.
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BLDC motor controller
Němec, Petr ; Červinka, Dalibor (referee) ; Knobloch, Jan (advisor)
The goal of this Master thesis is to design a power convertor for BLDC motor 48V/2kW. Emphasis is placed on the small dimensions of the final printed circuit board. Therefore, power SMD transistors STL135N8F7AG are used in small packages PowerFlat 5x6. To reduce area of the PCB, electrolytic capacitors are mounted on a separate board, which is located above the main PCB. Small high-capacity 22F/100V ceramic capacitors are used in the DC-LINK as well. They are located as close as possible to the power SMD tranzistors. Control logic will be provided by microprocesor STM32G474RE. High resolution timer HRTIM1 is used. The first part of this thesis is devoted to the brief description of BLDC motor construction and driving. Next parts are focused on the design itself.
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Strategic Cost Management in the Company
Němec, Petr ; Heralecký, Tomáš (referee) ; Kocmanová, Alena (advisor)
The diploma thesis deals with the issue of strategic cost management in the selected company. The theoretical part contains the division of costs into individual groups, budgeting and cost calculation and acquaintance with the tools of strategic cost management. The practical part focuses on the analysis of the current state of the company and its costs, where a horizontal and vertical analysis of costs and revenues is performed according to data from the company's profit and loss statement. This analysis identifies the key cost items of the company to which the chosen method of strategic cost management is applied in order to significantly reduce these items and thus improve the financial situation of the company.
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Proposal of Internet Promotion for E-commerce Solution
Němec, Pavel ; Kaňka, Mirek (referee) ; Luhan, Jan (advisor)
This master thesis deals with the issue of online promotion for a particular group of online shops. The first part deals with the clarification of concepts that are closely related to the given issue. The second part analyzes the current promotion of internet shops. In the design section there are several sub-proposals that lead to the improvement of e-shop promotion.
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Depth map by using Kinect
Němec, Pavel ; Kaller, Ondřej (referee) ; Boleček, Libor (advisor)
Nowadays, depth maps are widely used in various branches of human activity (in building industry, medicine, mechanical engineering, robotics, show business etc.). The aim of this thesis is to get acquainted with different methods of their acquisition and with possibilities of their enhancement (e.g. reduction of noise and points of not specified depth). The main subject of this research are depth maps acquired by Kinect device.
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Simulations of the magnetic domains dynamics in antiferromagnetic CuMnAs
Pařízek, Vojtěch ; Němec, Petr (advisor) ; Pokorný, Vladislav (referee)
Antiferromagnetic materials are promising materials for implementation in spintronic memory devices. In contrast to the more well-known ferromagnetic materials, which are already used in magnetoresistive random access memory (MRAM) devices, they possess multiple advantages, such as no net magnetization and ultrafast dynamics. Antiferro- magnetic memories store information through the orientation of the antiferromagnetic ordering. The magnetoresistance of the materials could be used for the electrical readout of the antiferromagnetic structure. In recent experiments in an antiferromagnet CuMnAs after applying a series of electrical or optical pulses, a change in resistivity associated with a significant decrease in the size of antiferromagnetic domains was observed. This means that one is able to perform electrical or optical writing in antiferromagnets. The state persists for timescales that exceed the magnetic dynamics timescales by many orders of magnitude. Here, we present the findings of the antiferromagnetic domain dynamics simulations in CuMnAs, specifically focusing on the process of small domain relaxation leading to the formation of larger domains. The simulations were based on atomistic spin dynamics. For all temperatures, a growth of magnetic domains was detected. However, the size of the...
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Evolution of brain complexity and processing capacity in birds: Cracking the problem using isotropic fractionator technique
Kocourek, Martin ; Němec, Pavel (advisor) ; Sedláček, František (referee) ; Kratochvíl, Lukáš (referee)
The most fundamental principle of comparative sciences has always been and still is the search for similarities and differences. Maybe that is why people are fascinated by the cognitive abilities of birds like corvids and parrots and their similarities to those of humans. For a long time, the prevailing explanation for the unique abilities of these species was their high relative brain size. However, the brain's processing capacity is not based on its size but on its internal architecture and the number of neurons and synapses. Today, we already have data on the numbers of neurons for hundreds of mammalian, avian, and reptilian species, obtained with the isotropic fractionator. In this thesis, I analyse cellular scaling rules for brains of birds and compare them between avian clades. Bird brains are characterized by large numbers of neurons and high neuron densities, which are comparable to those of mammals in gallinaceous birds (Galliformes) and in passerine birds (Passeriformes) and parrots (Psittaciformes) even exceed those observed in primates. The distribution of neurons is also different. In songbirds and parrots, the majority of neurons are typically located in the telencephalon, specifically in the pallium. The latest data suggest that this is a common feature of core land birds...
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