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Optimization Algorithm with Probability Direction Vector
Pohl, Jan ; Pokorný, Miroslav (referee) ; Matoušek, Radomil (referee) ; Jirsík, Václav (advisor)
This disertation presents optimization algorithm with probability direction vector. This algorithm, in its basic form, belongs to category of stochastic optimization algorithms. It uses statistically effected perturbation of individual through state space. This work also represents modification of basic idea to the form of swarm optimization algoritm. This approach contains form of stochastic cooperation. This is one of the new ideas of this algorithm. Population of individuals cooperates only through modification of probability direction vector and not directly. Statistical tests are used to compare resultes of designed algorithms with commonly used algorithms Simulated Annealing and SOMA. This part of disertation also presents experimental data from other optimization problems. Disertation ends with chapter which seeks optimal set of control variables for each designed algorithm.
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Antenna for microwave beacon on X-band
Zamazal, Bořivoj ; Pokorný, Michal (referee) ; Kasal, Miroslav (advisor)
This bachelor’s thesis describes an antenna design for microwave beacon in 10 GHz band. In the first section of the work, the possible solutions are presented and a slot antenna, constructed from commercially available waveguide, is chosen. In the second section, the principle of this antenna is described and the dimensions for the chosen frequency and the type of waveguide are calculated. In the third section, the antenna model is built and simulated in the Ansof HFSS environment in accordance with theoretically calculated dimensions and, based on these simulations, two possible versions of antenna are created.
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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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Computer modeling of MOSFET transistor
Major, Jan ; Harwot, Ondřej (referee) ; Pokorný, Michal (advisor)
Work is focused on computer modeling of PN junction and MOSFET transistor in the program COMSOL Multiphysics and in program TiberCAD. The text is discussed on the drift and diffusion in semiconductors. Also shown is a method of modeling the PN junction and MOSFET transistor in the programs and compare models.
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Miniature antennas for mobile communications
Kounek, Milan ; Láčík, Jaroslav (referee) ; Pokorný, Michal (advisor)
This bachelor thesis deals with downsizing techniques of planar antennas, while keeping important parameter for usage in mobile communications. In software IE3D there was designed antenna, working in ISM 2,4GHz band, which was downsized by methods described in this thesis. A group of antennas was created, 2 antennas were chosen, produced and measured. Results of measuring were compared with simulation and differences were evaluated.
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Antenna for receiving of DVB-T signal
Šmarda, Marek ; Lukeš, Zbyněk (referee) ; Pokorný, Michal (advisor)
The content of this work is to study selected antenna systems suitable for receiving of DVB – T. The various antenna systems will be simulated in the program for the simulation of electromagnetic field (e.g, CST Studio) and the simulation results will be commented (e.g. graphs and diagrams of radiation). Selected antenna system will be made and experimentally measured.
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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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Textil Integrated Horn Antenna
Jaroš, Ondřej ; Pokorný, Michal (referee) ; Vélim, Jan (advisor)
This diploma thesis describes the corrugated substrate integrated horn antenna designed to surface wave’s excitation in the UWB band groups 3, 4, 5 and 6 (6 – 10 GHz). The antenna is integrated into 3,4 mm thick textile with relative permittivity r = 1,195. The coaxial cable is connected via the SMA connector that is attached to the aluminum bracket. From the microstrip line transition the corrugated substrate integrated waveguide is excited. Two strip lines are placed in front of the aperture for improvement of the impedance matching. The directivity of the antenna is 12 dBi at 8 GHz. At the same frequency, the antenna efficiency is 70%.
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