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Coordination of MicroPython-Based IoT by Means of Node-RED
Kolář, Josef ; Peringer, Petr (referee) ; Janoušek, Vladimír (advisor)
The target of this thesis is to create means for using the Node-RED tool to coordinate physical nodes in the form of ESP32 chips in the Internet of Things. This is fulfilled by created Node-RED extension, the proposed MQTT channel protocol and custom firmware for these nodes. All of this suport deploy of diverse applications to nodes simultaneously side by side. The designed and implemented MicroPython firmware is capable of asynchronous operation of individual applications which provides an interface to communicate with the Node-RED. The functionality of this system has been successfully validated on the basis of two practical usage scenarios that demonstrate the possibility of direct use deployment system into practice in automation - even with the included firmware installer.
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Radio-frequency mixer
Kolář, Jan ; Urbanec, Tomáš (referee) ; Dřínovský, Jiří (advisor)
This bachelor's thesis is aimed to describe main parameters of mixers and principle of their measurement. There are presented devices and methods by whitch mixers can be measured. There are mentioned typical values of these parameters. The realisations of mixers are also described in this bachelor's thesis. The realisation is focussed on particular parts and circuit design. The part of this thesis is aimed to construct a working mixer and to measure its parameters. Also there is mentioned a design of laboratory exercise and an automated measurement setup done in Agilent VEE.
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Mathematical and Statistical Methods as Support of the Development of Software Applications
Kolář, Jan ; Doubravský, Karel (referee) ; Novotná, Veronika (advisor)
The subject of the thesis is design of an application for calculation of financial situation in the firm INKAREA s.r.o, which I have chosen. The software will be programmed in the intuitive environment of MS Excel with the help of VBA. I will use the reports from the accountancy during the years 2013–2017, which are going to be more analysed in the practical part. The theoretical part will be dedicated to description of statistical methods and indicators as well as introducing the chosen firm. In the end I would like to evaluate the firm´s condition and some possible suggestions for improvement of the strategy on the market.
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Approach to the nuclaer safety of the 3rd generation nuclear reactors
Pavlíček, Michal ; Kolář, Jaroslav (referee) ; Kolář, Jaroslav (referee) ; Matal, Oldřich (advisor)
The main target of the master´s thesis is reviewing the generation III nuclear reactors in term of the nuclear safety. At first we have to learn some theory of the nuclear safety in order to understand safety systems of the generation III nuclear reactors. Therefore the thesis is divided into two parts. Legislative and technical approaches to nuclear safety are mentioned in the first part. Regulatory bodies, whose task is to supervise nuclear safety in the nuclear power plants, belongs to the legislative approaches. There are defined terms such as defence in depth, redundancy, diversity, etc. There are mentioned methods to assessing nuclear safety – deterministic and probabilistic methods, especially probabilistic methods, for which a simple example is provided. There are also mentioned active and passive safety systems and their significance for nuclear safety and inherent safety too. There is an example of the function of the active and passive safety systems of the EDU nuclear power plant in conclusion of this issue. The second part deals with description of the selected nuclear reactors in context of the construction of the new units of nuclear power plant in Temelín. The nuclear reactors from companies, which applied for the public tender opened by ČEZ, a. s., for the construction of the ETE 3+4. Thus, the nuclear reactor MIR-1200 by ATOMSTROYEXPORT (Russian Federation), the nuclear reactor AP1000 by WESTINGHOUSE (USA) and the nuclear reactor EPR by AREVA (France) are taken into account . Comparison of the generation II and these generation III+ nuclear reactors necessarily belongs to this master´s thesis. These the generation III+ nuclear reactors are compared with the nuclear reactor VVER 440 (EDU) and in particular with the nuclear reactor VVER 1000, which is operated in the nuclear power plant Temelín. The final chapter contains generally appraisal of the whole problem.
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Analysis of the influence of thermal effects on thermophotovoltaic system
Kolář, Jakub ; Vyroubal, Petr (referee) ; Šimonová, Lucie (advisor)
This semestral thesis focuses on the description of specific renewable resources in the form of thermophotovoltaic cells using selective radiators with micro/nano structures. This work deals with an introduction of renewable resources and specifically focuses on thermophotovoltaic. Thesis describes basic principles, but also influences affecting the proper functioning of these systems. It also focuses on selective radiators, which are created by mikro/nano structures, and factors that can affect their implementation or simulation. Part of the work are also examples of calculations of basic parameters of the structures, which will be used in the simulations. Next chapters are dealing with simulations which are analyzing thermal effects on termophotovoltaic system. Except the analysis itself there is also partial optimalization solving some of the negative thermal effects.
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The security of operating systems for mobile devices
Kolář, Jakub ; Babnič, Patrik (referee) ; Rosenberg, Martin (advisor)
This term paper explains the concepts related to security of mobile devices. The first chapter acquainted with how to develop mobile operating systems and what types are found on the market today. Then the work explains the basic types of attacks and security vulnerabilities. Further work is discussed in the most famous and most popular operating systems, from their basic descriptions, architecture, and then security. In the eighth chapter of this work is a basic description and explanation of the function code itself created by malicious applications. The chapter contains weaknesses of the Android operating system used by the application, opportunities spread of malware and protect against possible attack. In the last chapter is contained laboratory task that acquaints students with the Android operating system and focuses on knowledge inappropriately protocols used to communicate with the Internet applications.
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PLC technology in data collection systems
Kolář, Jan ; Mlýnek, Petr (referee) ; Mišurec, Jiří (advisor)
This bachelor thesis deals with the use of PLC technology in data collection. The first part includes information about PLC. An analysis of types, properties and types of modulations of PLC focusing on the narrowband one is carried out. Used modems from Yitran company are described. Attention is also paid to creation of software for an application focused on data collection from simple sensors. The thesis incudes the description of two created applications required for the realization of data collection system. In the last part, measurement of packet loss dependence on distance is described. From the measurement it follows that the modems operate reliably with rising distance as well.
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Travelling Crab
Kolář, Jiří ; Jonák, Martin (referee) ; Malášek, Jiří (advisor)
Thesis covers the basic calculations for the design of the basic dimensions of the lift mechanism of travelling crab to load 30,000 kg, strength calculation parts of the hook block such as pulley bolt, beam and side rod, as well as draft propulsion. The last part is the design documentation of assembly drawing of the hook block and detailed drawings of selected components.
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Business Plan - Biogas Plant
Michalica, Miroslav ; Kolář, Jan (referee) ; Veselý, Josef (advisor)
The subject of the thesis is to design a business plan for the construction of biogas plant in the village Bulhary. The actual work is divided into two main parts. The first part is devoted to theoretical resources of a business plan and theory related to biogas station. The practical part of the thesis applies the theoretical knowledge to create a real business plan.
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L-band receiver front-end
Kolář, Jan ; Špaček, Jiří (referee) ; Kasal, Miroslav (advisor)
This Master's Thesis deals with a design of L-band receiver front-end. In the concrete the receiver is designed for receiving signals of frequency band 1,3 GHz. All particular blocks from low noise amplifier to intermediate frequency amplifier and frequency doubler in LO input are described, designed and simulated in program Ansoft. The part of this Master's Thesis is aimed to construct a working front-end receiver and to measure its basic parameters.
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