|
|
Communication infrastructure for drone swarm
Kubant, Michal ; Mikulka, Jan (referee) ; Janoušek, Jiří (advisor)
This thesis deals with creation and testing of wireless communication network used for transmission of multimedia and telemetry data in swarm of unmanned aerial vehicles. In the first part of this work are presented functions of the IEEE 802.11ax and their possible usage. The second part if thesis describes configuration of network elements in the wireless network, and discusses maximum transmission speed. The third part presents testing of the assembled network, designs and use of protocols for multimedia streams in a swarm of drones. Also the results are briefly evaluated and illustrated. The fourth part analyzes the methodology of testing the network in the outdoor environment, it discusses the results obtained by using this methodology in different outdoor spaces, and further proposes suitable solutions for improving the efficiency and range of the wireless network.
|
|
|
Optimizing Image Reconstruction in Electrical Impedance Tomography
Dušek, Jan ; Brančík, Lubomír (referee) ; Sikora, inž Jan (referee) ; Mikulka, Jan (advisor)
Tato disertační práce pojednává o optimalizaci algoritmů pro rekonstrukci obrazu neznámé měrné vodivosti z měřených dat pořízených elektrickou impedanční tomografií. Danou problematiku zde věcně vymezuje několik různých prvků, zejména pak stručný matematický popis dopředné a inverzní úlohy řešené různými přístupy, metodika měření a pořizování dat pro rekonstrukci a přehled dostupných numerických nástrojů. Uvedenou charakteristiku rozšiřuje rozbor optimalizací parametrů modelu ovlivňujících přesnost rekonstrukce, způsoby paralelního zpracování algoritmů a souhrn dostupných zařízení pro měření tomografických dat. Na základě získaných poznatků byla navržena optimalizace parametrů matematického modelu, která umožňuje jeho velmi přesný návrh dle měřených dat. V této souvislosti dochází ke snížení nejistoty rekonstrukce rozložení konduktivity. Pro zefektivnění procesu získávání dat bylo navrženo zařízení k automatizaci tomografie s důrazem na cenovou dostupnost a snížení nejistoty měření. V oblasti tvorby numerického modelu byly dále zkoumány možnosti užití otevřených a uzavřených domén pro různé metody regularizace a hrubost sítě, a to s ohledem na velikost chyby rekonstruované konduktivity a výpočetní náročnost. Součástí práce je také paralelizace subalgoritmů rekonstrukce s využitím vícejádrové grafické karty. Předložené výsledky mají přímý vliv na snížení nejistoty rekonstrukce (optimalizací počáteční hodnoty konduktivity, rozmístění elektrod a tvarové deformace domény, regularizačních metod a typu domén) a urychlení výpočtů paralelizací algoritmů, přičemž výzkum byl podpořen vlastním návrhem jednotky pro automatizaci tomografie.
|
|
|
Virtual measuring instruments to support the education
Bilík, Petr ; Marcoň, Petr (referee) ; Mikulka, Jan (advisor)
This diploma thesis deals with the creation of the Virtual Measuring Instruments web application. This tool mainly enables us to simulate the real measuring instruments widely used in the laboratories of FEEC BUT. It is intended to serve students for initial acquaintance with specific devices. The theoretical part is focused on the research into the web applications programming and suitable programming languages to implement the proposed application are selected. Furthermore, the specific virtualized devices are described. The result of the experimental part consists in creating a universal application interface to extend the proposed application with other devices. Finally, the specific tests of the developed platform are presented.
|
|
|
Precise segmentation of image data
Svoboda, Jan ; Marcoň, Petr (referee) ; Mikulka, Jan (advisor)
The concern of this thesis is a development of an extension module for 3D Slicer platform. The core of the module is an implementation of a Support Vector Machines classifier, which is used for segmentation of the vertebral column image data provided by the University Hospital Brno. One of the goals of the thesis was resampling and registration of these image sequences. CT volumes provided solid contrast and were used as a reference for gaining properly segmented groups of vertebrae. Due to the low quality of the MRI volumes image data, segmentation of MRI images was not completely succesful. The extension module scripted in Python language can be seen as a tool and can be used in the future for different datasets.
|
|
|
Portable digitally controlled stabilized source of symmetrical voltage
Hynek, David ; Drexler, Petr (referee) ; Mikulka, Jan (advisor)
This thesis deals with a design of a power supply for a measuring equipment for a geophysical mapping intended to do a reconstruction of an electrical impedance of a ground environment of water reservoirs. The power source is going to be used for laboratory measurements and for outdoor experiments. The thesis describes the selection of suitable components, equipment design and testing. The theoretical part explains the functions of used components and the principle of an electrical impedance tomography. The conclusion summarizes the properties of the proposed solution and evaluates the final product.
|
|
|
DESIGN OF FIBER-OPTIC BIOSENSOR WITH NEAR-INFRARED SPECTRAL ANALYSIS
Křepelka, Pavel ; Jakubec,, Martin (referee) ; Skládal, Petr (referee) ; Mikulka, Jan (advisor)
This thesis deals with a measurement and interpretation of NIR spectra of bacterial cells and design of biosensor using this analytical technique. In the first chapter, there is introduction of current state of knowledge in the field of NIR spectroscopy in microbiology and technology of fiber optic biosensors. The summary of this chapter shows that NIR is a suitable technique for direct molecular analysis of bacteria, but it suffers from low sensitivity and insufficient interpretation of bacterial spectra. In the next part of the thesis, there is a theoretical background of spectral analysis techniques and technology of fiber optic sensors. In the practical part of this work, there is suggested the elimination of disadvantages of NIR spectroscopy in microbiology by a series of experiments used for interpretation of NIR spectra of bacteria and design of fiber optic sensor to increase sensitivity of this technique. In this work, spectral regions important for the identification of bacterial strains were determined and partially interpreted and the sensor for bacterial analysis capable of classifying strains based on 105 captured cells was designed. Therefore, the objectives of this work were fulfilled.
|
|
|
Laser source with fiber-optic output
Roupec, Tomáš ; Mikulka, Jan (referee) ; Drexler, Petr (advisor)
This term project deals with the semiconductor laser components, and how it works. Additionally, there is an optical fiber ant networking with laser. It is written of power and cooling laser diodes and such information suggested the possible involvement of the laser diode. At the end of this work is designed laser´s exciter with charging and adjacent circuits.
|
|
|
A laboratory task to verify the properties of audio devices
Staňková, Karolína ; Marcoň, Petr (referee) ; Mikulka, Jan (advisor)
The aim of this thesis is familiarization with the parameters of an audio device and their measurements according to the standards (AES17-2018 and ČSN EN 60268-3). A laboratory task for the Measurement in Audio Engineering course is designed, based on the study of the standards. The first part of the thesis deals with detailed analysis of the measurements of different parameters of audio device. The described procedures are consequently employed to design the laboratory task. The second part of this thesis is dedicated to design the laboratory task. The automatized system based on HP VEE platform was developed to provide the multiple measurement. The attachments of this thesis contain the student’s manual for the laboratory task, the sample protocol, the testing measurement manual and the sample protocol for the testing measurement.
|
|
| |
|
|
Detection algorithms of moving objects
Novotný, Josef ; Mikulka, Jan (referee) ; Marcoň, Petr (advisor)
This work deals with detection methods of moving objects. This thesis contains a research of available solutions for further implementation on the Raspberry Pi using the OpenCV library. The aim of the thesis is to realize a module that is capable of detecting and recognizing moving objects in the sky. Required objects can be detected in static or dynamic mode. In the theoretical part of the thesis are methods divided into motion detection, object detection and object recognition. In the practical part were for detection of undesired objects selected a background subtraction method and the localization of significant ORB points. Haar feature-based cascade classifiers was for recognition of learned objects chosen. In the practical part, methods were of computational difficulty and detection success tested. The result is an automatic detection device that allows to watch and distinguish unwanted objects in the sky.
|
guest ::
