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Multiobjective Optimization in EMC
Olivová, Jana ; Sekanina, Lukáš (referee) ; Křesálek,, Vojtěch (referee) ; Raida, Zbyněk (advisor)
The work is aimed to propose a methodology for creating an equivalent of composite materials used for construction of small aircraft. Such equivalent should enable to create numerical models of small aircraft in the simulation of precertication EMC tests for aircraft resistance against the lightning. Eliminating situations threatening the aircraft and passengers in the initial steps of the design will allow savings in production costs and contribute to the safety of air transport. In order to nd the equivalent of composite materials, global optimization methods will be used.
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Multiband embroidered antennas
Fraj, Lukáš ; Olivová, Jana (referee) ; Raida, Zbyněk (advisor)
This thesis is engaged into the designing embroidered dipole multiband antenna. Numerical models of the antenna, operating at GSM 900 Mhz, PCS 1900 MHz and WLAN 2450 MHz bands, were designed using finite-element ANSYS HFSS software. Simulations of this antenna in the free space and near the human body, interpreted by numerical model, are compared with each other. Afterwards the antenna is optimized for 900 MHz, fabricated and measured. All achieved results are compared with the pattern.
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Internet textbook: time domain finite differences
Martinů, Michal ; Olivová, Jana (referee) ; Raida, Zbyněk (advisor)
The project is focused on the development of the computer program demonstrating principles of the time-domain finite difference method. Principles of the method are demonstrated by a script for Matlab. The script is completed by the standard user’s interface of Windows. Programmer’s guide and user’s guide are of the form of Internet pages. I have to create a part of internet textbook with all of layers and warrant a compatibility with existing version. In both languages, Czech and English.
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Modeling non-conventional monopoles in COMSOL Multiphysics
Zmeškal, Vladimír ; Olivová, Jana (referee) ; Raida, Zbyněk (advisor)
The project deals with the computer simulation of non-conventional monopoles in the program COMSOL Multiphysics. First, the methodology for using COMSOL Multiphysics is described. Second, we concentrate on the design and modeling of three types of non-conventional monopoles: the conical one, the capacitively loaded one, and the drop-shaped one. For each monopole, directivity patterns are displayed. The influence of the variation of antenna dimensions to its parameters is discussed. Monopoles are mutually compared. Finally, models of monopoles are completed by global optimizations techniques: genetic algorithms and particle swarm optimization. That way, a design tool is developed in MATLAB.
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Wideband antenna for hazardous electromagnetic fields detection
Faltýnek, Josef ; Olivová, Jana (referee) ; Řezníček, Zdeněk (advisor)
The thesis is focused on the design of a wideband detector used for detection of HIRF field. The detector, which is based on PICA antenna, was deeply examined and its´shape was also modificated for the purpose of achieving better omnidirectional and impedance characteristics. The thesis also deals with the design of cross PICA antenna variations, which purpose is to improve pattern bandwith. The PICA antenna variations mentioned were compared with one another at the end of the work. The end of the thesis also deals with the comparison of measured results gained from the specimen made with the results gained from the simulations.
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Design and optimization of the helical antenna
Zelinková, Lenka ; Olivová, Jana (referee) ; Lukeš, Zbyněk (advisor)
The thesis contains the design of helical antennas for the assigned frequencies. The theoretical design is verified by parameter calculators. The design properties were verified in the computer simulator CST Microwave studio where the antennas were optimized to the maximum gain. The antennas intended as parabola feeds are completed with the designs of parabolas and focal distances between the antennas and the parabolas. Impedance matching by a quarter-wave transformer is designed for the antennas.
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Circularly polarized superstrate antenna for CubeSat
Kratochvíl, Dušan ; Olivová, Jana (referee) ; Raida, Zbyněk (advisor)
The thesis is focused on parameter verification of a circularly polarized antenna with a superstrate, which was designed for CubeSat and presented in the research paper [1]. The frequency band of the designed antenna is from 8.35 to 8.95 GHz. First, the antenna is analyzed without the superstrate layer. Varying the feed position and antenna element dimensions, the changes of reflection coefficient at the input is matched. Second, an overall simulation with a superstrate layer is performed. The antenna substrate was replaced with ARLON 25N microwave substrate available in the laboratory, and the antenna was optimized for this substrate. Finally, such an antenna is fabricated, and its measured parameters are compared with the simulation results.
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Robotic Neurosurgery Planning Tool
Sadleková, Simona ; Olivová, Jana (referee) ; Kadlec, Petr (advisor)
Táto diplomová práca sa zaoberá problematikou plánovania robotických operácií pre neurochirurgiu a optimalizačnými algoritmami používanými na návrh operačných zákrokov nimi prevádzaných, predovšetkým algoritmom VNDMOPSO. V úvodnej kapitole je vysvetlený základný princíp prevádzania robotických operácií a popísaný koncentrický trubicový robot používaný pre tento účel. Ďalej sa práca zaoberá všeobecným popisom optimalizačných problémov a algoritmov ich riešiacich a následne je podrobne popisovaný algoritmus VNDMOPSO, vybraný pre daný optimalizačný problém. Pre tento algoritmus je vytvorená v prostredí MATLAB funkcia, ktorá je následne testovaná na viacerých testovacích úlohách. V nasledujúcich častiach je overovaná jej funkčnosť na reálnych tvaroch nádorov a je predstavené grafické užívateľské prostredie, ktoré slúži ako nástroj pre plánovanie neurochirurgických robotických operácií. V záverečnej časti práce je vyhodnotený vplyv nastavenia jednotlivých parametrov algoritmu na výsledky optimalizácie.
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The role of the word of God in christian spiritual life
Olivová, Jana ; Kohut, Pavel Vojtěch (advisor) ; Ventura, Václav (referee)
RÉSUMÉ The problem of word of God in spiritual life of the Christian The topic of this work is Holy Scripture - Word of God - from the sight of spiritual life. What is the Bible for Christian? How it can be influent for our daily life? How the Church understood the Holy Scripture? Theoretic resource of this work is teaching of the Second Vatican council about word of God, especially constitution "Dei verbum". There were basic ideas of this teaching formed in Century 19th by biblical movement, which made an effort for more serious thinking in the faith through the come back to the source of the Holy Scripture. The principal points of the teaching of the Second Vatican council about word of God are followed: "The Scripture" is revelation of the God. The God reveals us in the Scripture his plan of the salvation which culminate by the coming the Son of God into the world. The Holy Scripture is inspired word of living God therefore the church has it in honest and love. The constitution "Dei verbum" speaks the table of the word of God in the same level as the eucharist. Through the Scripture we meet the God that is why it is for faithful "food" on the way to the salvation. The teaching of the Council had opened the way to the study of the Scripture based on the scientific level. It also encouraged lay people to...
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