|
| |
|
|
Semi-Automatic Image Segmentation
Horák, Jan ; Beran, Vítězslav (referee) ; Španěl, Michal (advisor)
This work describes design and implementation of a tool for creating photomontages. The tool is based on methods of semi-automatic image segmentation. Work outlines problems of segmentation of image data and benefits of interaction with the user. It analyzes different approaches to interactive image segmentation, explains their principles and shows their positive and negative aspects. It also presents advantages and disadvantages of currently used photo-editing applications. Proposes application for creating photomontages which consists of two steps: Extraction of an object from picture and insertion of it into another picture. The first step uses the method of semi-automatic segmentation GrabCut based on the graph theory. The work also includes comparison between application and other applications in which it is possible to create a photomontage, and application tests done by users.
|
|
| |
|
|
Engagement Force Control of Multi-plate Clutches of Dual Clutch Gearbox
Horák, Josef ; Prokop, Aleš (referee) ; Novotný, Pavel (advisor)
The master’s thesis deals with ways of controlling starting clutches of cars, especially of DQ200 gearbox, which contains dry disc clutches. The introduction describes basic principles of torque transfer and amount of clutch force. Then the description of construction of starting clutches and ways of controlling clutch types mentioned beforehand is given. In the next part of the thesis, wide spectrum of control methods is measured, from which a certain part is selected. This is followed by driving tests and based on driving data, one method of the clutch control is chosen. Then those control methods from narrow selection are tested for acoustic impact in the cabin of the car. In the end the best way of clutch control is selected. The selection based on driving data and acoustic measurement.
|
|
|
3D printed directional antenna
Dvořák, Václav ; Horák, Jiří (referee) ; Láčík, Jaroslav (advisor)
This master thesis deals with a study of directional antennas, followed by their design and optimization of horn antenna based on SIW for Ka band (26,5- 40 GHz). The first part of the thesis contains the theoretical analysis of the different types of directional antennas, also the SIW technology is described here. It also describes the 3D printing technology by means of which the final antenna should be made. The next part of this work is about design of horn antenna based on SIW. Simulation and optimization of the antenna will be done using the CST Microwave Studio. The horn antenna was modeled with three different dielectric loads. The horn antenna with an experimental triangular dielectric load was chosen for fabrication. The fabricated antenna has reached almost the whole bandwidth to cover Ka. The antenna gain was 9,38 dBi for 33 GHz frequency.
|
|
|
Android Application Design and Monetization Strategy
Doležel, Filip ; Horák, Jiří (referee) ; Luhan, Jan (advisor)
The bachelor's thesis deals with the design of a mobile application for the Android platform. It assesses the implementation tools designed for this development, then contains design of implementation and testing which is an integral part of the application development process. The next section is dedicated to an elaborated analysis of possible ways of monetization of an Android application and selection of a suitable monetization strategy for the developed application. It also includes an example of a typical user of the application according to analysis.
|
|
|
Support systems (frames, stands) in modern machine tool design
Horák, Jiří ; Marek, Tomáš (referee) ; Knoflíček, Radek (advisor)
This bachelor’s thesis has a character of recherche, and it is focused on a description of an actual state and construction of supporting systems and frames of machine tools. This thesis deals with the construction of machine centers. It also analysis adverse effects arising from the machining, that the machine frame must withstand to maintain sufficient precision. In the thesis, there are also some basic principles for the construction of support systems. The thesis also includes a recherche describing the most common design arrangements in the creation of machine tools, as well as the author’s observations on the possible development of the problem.
|
|
|
Generation of nanoparticles by electrical discharge in liquids
Čechová, Ludmila ; Horák, Jakub (referee) ; Kozáková, Zdenka (advisor)
This thesis focuses on the process of nanoparticle generation by electric discharge in liquids. The theoretical part is focused on generation of electric discharge in liquids, various methods of preparation of nanoparticles, including plasmachemical methods and methods of nanoparticle characterization. The experimental part deals with the preparation of silver nanoparticles. As a precursor for generation of nanoparticles by electric discharge, an aqueous solution of silver nitrate was used. The influence of experimental conditions, such as the influence of voltage polarity, influence of delivered power, effect of concentration, effect of added electrolyte and time course of nanoparticle formation were studied. All samples were analyzed by UV-VIS spectrometry. To confirm the presence of nanoparticles in the solution, one of the samples was analyzed by a scanning electron microscope with an energy dispersion spectrometer for elemental analysis. Plasma diagnostics was performed using optical emission spectroscopy.
|
|
|
Rectifying antenna
Makarov, Vitalii ; Horák, Jiří (referee) ; Láčík, Jaroslav (advisor)
This Master´s thesis describes different methods of wireless transmitting of energy: electromagnetic induction, electrostatic induction, laser radiation, transfer of energy by microwaves. This thesis is focused on wireless transfer of energy by microwaves. The paper describes the individual parts of the rectenna. Comparison of different types of antennas for use in the rectenna was made. In this thesis is described set of requirements for design of rectenna. Was made design of the rectenna and its simulation.
|
|
|
Control of Stepper Motors in Closed Loop System
Hořák, Jan ; Vochyán, Josef (referee) ; Dřínovský, Jiří (advisor)
The theme of this thesis is the design and optimization of algorithms for controlling stepper motors with feedback by measuring the BEMF. The emphasis was on self-management stepper motor current depending on the load. To verify the algorithm was designed and built sample devices with integrated circuit NCV70514 from ON Semiconductor. The result is a sample device, the control program and algorithm to control a stepper motor.
|
guest ::
RSS feed.