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Wireless local network detection device
Procházka, Miroslav ; Beneš, Jan (referee) ; Prokopec, Jan (advisor)
This thesis deals with Wifi and presents proposal of device for wireless network detection working in free of licence band 2,4 GHz. This work is devided into two parts. First includes a description of standart IEEE 802.11, it's apendix folowed by a description of physical and connection layer and wireless network security. In this part, basic principles of Wifi networks are explained. The second part of the thesis concerns a proposal of device for wireless networks detection. The second part also includes a list and description of used components and flow diagram, that illustrates an algorithm for wireless network detection.
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Mobile germicidal source
Procházka, Michal ; Murina, Milan (referee) ; Steinbauer, Miloslav (advisor)
Germicidal light is a type of UV light which is able to kill bacteries and microorganisms. These germicidal lamps usually operate on the same principle like common fluorescent lamps but they emit the different spectra. For higher efficiency and longer lamp life it is desirable to use electronic ballast as a source for germicidal lamp which in version of integrated circuit offers further advantages. First part of the thesis describes the theory of UV desinfection and electronic ballasts. The second part is about the construction of the mobile germicidal source. In the last part of the thesis there is the germicidal mobile source tested against a few various mildews.
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Valuation of Baťa, a.s
Procházka, Michal ; Bernát, Michal (referee) ; Beranová, Michaela (advisor)
The aim of the master’s thesis is to valuate comapny BATA, a.s. using income – based valuation mmethods. Thesis is dividend into two parts, theoretical and practical. Theoretical part describes basic charakteristics of the terms, defines company and its value, overview of invidual methods and procedures used for valuation of the company. Practical part is focused on application of theoretical knowledge in practise. The master’s thesis contains economical analysis, especially strategic analysis, financial analysis and preliminary valuation of comapany based on value generators. Company value was based on two yield methods, especially method of discounted cash flow entity and method of economic addend value.
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Five-cylinder in-line diesel engine with viscous type damper
Procházka, Miloslav ; Novotný, Pavel (referee) ; Píštěk, Václav (advisor)
The aim of this diploma work is to design moving parts of the five cylinder inline diesel engine with given parameters, then to balance centrifugal forces and moments and design viscous torsional vibrations damper and calculate forced oscilations without the damper as well as with the damper. The designed parts are put to stress analyse by finite elements method. My design is based on similar construction of four cylinder engine Zetor.
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Solder Wave Process Optimization
Procházka, Martin ; Brno, Martin Štěpánek HONEYWELL (referee) ; Starý, Jiří (advisor)
This work describes solder wave process and it‘s optimalization. It informs us about wave soldering and describes it’s fragments. Next it is described partition of fluxes and their properties. In practical part is described researching of defects on PCB’s and analysis of possible reason of defects, measurement of the weight of sprayed flux and measurement of solderable profile.
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Pension with restaurant in Libomyšl
Procházka, Martin ; Rozehnal, Miroslav (referee) ; Štěpánek, Ladislav (advisor)
Master´s thesis solves the design of an object of restaurant and guesthouse in Libomyšl. The building has a rectangular shape with a additional building on the north side. The building has three floors. Above the house is designed backgrounds access service for flat roof duplex apartment located in the building. Roofing of the main part of the building is made by sloped saddleroof with ten skylights. Additional object is covered by a single layered flat roof.vered by a single layered flat roof.
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NQR spectroscopy - design of measurement methods
Procházka, Michal ; Bartušek, Karel (referee) ; Steinbauer, Miloslav (advisor)
Nuclear quadropole spectroscopy is a modern analytical method for detecting specific solid state materials, e.g. explosives, drugs etc. It uses phenomenon of atomic nucleus called nuclear quadrupole moment. NQR method is very similar to common nuclear magnetic resonance (NMR) that is why major principles are explained using NMR. The thesis deals with basic principle of NQR, its usage for explosives detection and also detection of other chemical compounds and many other useful applications. The thesis deals with specific circuit design, techniques for sufficient sensitivity, impedance matching and circuit isolation. Practical part consists of simulations as well as designs of a few impedance transformers, pi-networks, and coils. Also experimental probe was created. In the last part, NQR workplace was assembled and a few chemical compounds were detected. These were KClO3, NaClO3 and NaNO2 . Finally minimum detectable amount of potassium chlorate as the strongest signal of these was determined.
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Wireless data collection form engine control units
Procházka, Miroslav ; Kejík, Petr (referee) ; Prokopec, Jan (advisor)
This thesis deals with implementation of a wireless interface for a module providing communication between computer and electronic control unit of an automobile. The 802.11 standard, wireless network structures and MAC sublayer were described. The thesis suggests selection of the most suitable WLAN module, testing of module's features used and the WLAN module implementation. Modifications for the next device version were developed and programs for device operation were implemented.
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Temperature Profile in Reflow Soldering and Influence of Different PCBś and ComponentsThermal Capacities
Procházka, Martin ; Špinka, Jiří (referee) ; Starý, Jiří (advisor)
This thesis mainly deals with the prediction of temperature on the components and the PCB during reflow soldering. The theoretical part describes the particular solder reflow process, types of heat transfer and temperature profiles. The practical part is divided into forecasting temperatures if the conveyor is stopped and the temperature predictions when the conveyor is in motion. In both parts of the measured temperature is compared with the predicted temperatures, which show the success rate of prediction. The last part of this work is part of the simulation, which helps in proper understanding of the issues discussed.
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