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Magnetic drive
Aubrecht, Ondřej ; Pokorný, Michal (referee) ; Raida, Zbyněk (advisor)
In the bachelor thesis, selected types of magnetic motors are analyzed and mutually compared. For each motor, a short description is given and critical evaluation of its properties is provided. In the next part of the project, all the magnetic motors are mutually compared and a suitable type of the motor for the computer simulation is chosen. The simulations are performed in programs COMSOL Multiphysics and program Femm. In the last part of the project, simulations are checked on the real prototype of magnetic motor.
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Semiconductor diode modelling
Pacholík, Vladimír ; Wilfert, Otakar (referee) ; Pokorný, Michal (advisor)
This project is about phenomena, which proceed in semiconductor, eventually on semiconductor junction, including equations and relatives necessary for modeling simply semiconductor PN diode, Gunn diode and Schottky diode. Further including short way, how to use this equations and how simulate this diode in COMSOL Multiphysics and Tiber CAD software. Products of modeling are data in charts form. This charts giving basic idea about charge carriers, electrostatic potential and I-V characteristic.
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Modeling HF diode in Comsol Multiphysics
Truhlář, Michal ; Pokorný, Michal (referee) ; Raida, Zbyněk (advisor)
This work brings understanding effects in semiconductor diode by rise P-N junction. Attention devote to suggested high frequency semiconductor diode in program Comsol Multiphysics 3.3.Atention is concentrated to optimization model of diode so as volt-ampere characteristic resembles to real characteristics of diodes. Is tried to find a solution to entourage P-N devolution, where this program sensitive on changes geometry’s barriers of these is different types P-N. In work is summary of treatment and advancing by divining and by optimization of high frequency diode. First part describes semiconductor diode like component used in the electrotechnics, which explains rise, descriptions, using and types of used diodes. Second part includes progress of scaling concrete semiconductor high frequency silicon diode. In this work is braining to optimization model of diode to real and research parameters, which influence her descriptions. In last part of my bachelor’s work was created a simple program in Matlab for global optimization. This program by connected with model of diode and check up possibilities of optimizations their parameters
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Small-size active integrated antenna
Nunvář, Rostislav ; Pokorný, Michal (referee) ; Raida, Zbyněk (advisor)
Bachelor’s thesis deals with basic types of planar antennas, with the design and simulation in the program ANSOFT Designer. The project is focused on the completion of a planar antenna by an active element (a transistor). The transistor can be integrated into planar structure by the N-Port function of Ansoft Designer. Finally, advantages and disadvantages of passive and active planar antennas are described.
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Dielectric waveguides modeling
Šikl, Tomáš ; Lukeš, Zbyněk (referee) ; Pokorný, Michal (advisor)
Bachelor’s thesis are about dielectric waveguides, which are a natural alternative to metal waveguides. These waveguides are largely use in optoelectronic technology. Dielectric waveguide are creates in COMSOL Multiphysics, there are make overview and comparison of parameters of dielectric waveguide compared to conventional metal waveguides. My task is to create a comprehensive overview of simulation most frequently used adjustments to the dielectric waveguide, that are use in the production and there are compares the most important parameters of the simulated model and real waveguide.
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Computer modeling of FET transistors
Kaupa, Petr ; Pokorný, Michal (referee) ; Raida, Zbyněk (advisor)
The project deals with FET transistors, basic principles of their operation and their properties. The project is dominantly focused on modeling FET transistors in FEMLAB. The project describes the optimization of the model of the simulated transistor. The optimization is aimed to reach the match between the model of the transistor and parameters of real transistors. The optimization algorithm is programmed in MATLAB. This algorithm is based on the particle swarm method.
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Patch antenna with switchable polarization
Havelka, Michal ; Pokorný, Michal (referee) ; Raida, Zbyněk (advisor)
The bachelor’s thesis deals with the analysis of basic planar antennas, the design methods, optimization and simulation in ANSOFT Designer. Attention is turned to the design of aperture coupled microstrip antennas. First, the antenna with a simple slot is designed. Second, the design of the ring slot coupled microstrip antenna is described. Both the antennas are designed for the operation frequency 2,45 GHz. The second part is devoted to the antenna with switchable polarization. Using three PIN diodes powered by lithium battery of 3-V, the linear polarization (both the horizontal one and the vertical one) and the circular polarization (both the right-hand one and the left-hand one) can be switched. The results were verified by experimental verification.
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The Proposal for Improvement of Supply Management
Krejčí, Petra ; Pokorný, Michal (referee) ; Mikulec, Luděk (advisor)
This thesis focuses on the study and optimization of inventory management in company XXX Ltd. The theoretical part is dedicated to characteristic of basic concepts related to inventory management, their classification, related costs and inventory management methods. Practical part is focused on the analysis of the current state in the company, on providing, storage and controlling of inventory. This analysis reveals deficiencies for which several solutions will be suggested. They will lead to more effective inventory management in the company.
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Evaluation of the Financial Situation of a Company and Proposals for its Improvement
Plottová, Sylvia ; Pokorný, Michal (referee) ; Zinecker, Marek (advisor)
The aim of this thesis is to asses the financial situation of a company based on the results of financial analysis and to present proposals for improvements in problem areas. The thesis is divided into three parts. In the first part were collected theoretical knowledge and procedures necessary to understand the nature of financial analysis. The second part applies the theoretical knowledge and assess the situation in the given company. In the third part of the work are then presented recommendations for improvement of a problematic areas.
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