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Platform for Digital Predistortion Based on RFSoC
Kříčka, Tomáš ; Maňas, Ondřej (referee) ; Král, Jan (advisor)
Signal predistortion occurs in modern communication systems and in other systems requiring linear signal amplification. The objective is to learn about signal predistortion, the QORVO 1800 MHz FDD radio front-end and to implement the front-end control using Matlab computer program. I focus on controlling individual attenuators and amplifiers on the QORVO front-end with a program written in C. Using a single board computer Raspberry Pi 4B running Linux. Furthermore, the work involves the application of a SCPI server that operates based on TCP packets. As part of the introduction to the front-end, the power characteristic of the power amplifier is measured.
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Power supply for acquisition and communication subsystem of a current transformer
Beran, Tomáš ; Král, Jan (referee) ; Kubíček, Michal (advisor)
This bachelor thesis is focused on designing a power supply for measuring part and communication part of a device, which is supposed to analyze current waveforms on high voltage lines. The power supply consists of a current transformer, control electronics, and accumulation elements. The thesis analyzes the current waveforms on high voltage lines to get an overview of input data so that the right current transformer can be chosen. A working principle of these transformers is described, as well as the options for accumulation elements. Power supply requirements for the power supply are determined as well. The next part of the thesis summarises this theoretical knowledge and applies it to the schematic design. This is followed by a description of the schematic with an included description of function blocks. Additional adjustments that would improve the power supply's properties might be mentioned. This will be followed by designing a PCB layout. The final part includes the manufacturing process and determination of parameters like power, efficiency, etc. In the manufacturing process, the PCB will be printed, soldered, and evaluated on an electrical test. The electrical test inspects the functionality of the designed power supply by simulating real-life scenarios of high voltage lines. At last, an impact of the power supply on the measuring system will be analyzed.
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Diffusivity of humic hydrogels
Král, Jan ; Smilek, Jiří (referee) ; Klučáková, Martina (advisor)
Presented diploma thesis focuses on the study of diffusion of cupric ions in humic acid gels. A total of fifth different standards of humic acids and one sample humic acid prepared from same source as in bachelor's thesis, on which this thesis continues, were used for preparation solutions of humic acids. Thereafter, these solutions were used for preparation of agarose hydrogels, which were necessary in following diffusion experiments. The objective of the work was to compare transport properties of humic standards between themselves and then compare standards with humic acid prepared from same source as in bachelor's thesis. Measure, which was used to determine the transport properties, was comparison of effective diffusion coefficients. Method of instantaneous planar source diffusion was used to compare them. This method was based monitoring temporal evolution of diffusion profiles of cupric ions in humic hydrogels. Copper ions were selected as diffusing medium because of their high affinity and strong bonds to humic acids.
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Home automation system
Bajgl, Vojtěch ; Král, Jan (referee) ; Kubíček, Michal (advisor)
This thesis deals with home automation systems. First part of the thesis is focused on analysis of commercially available state-of-the-art systems. The most common ones are compared in terms of their functions, properties, principles of operation and their price. Second part of the thesis describes design and development of custom system for home automation. The aim is to build a cheap alternative to the commercially available systems. The design description starts from schematic design of particular components through PCB design to firmware and software development. The system is based on Raspberry PI 2B microcomputer which controls all the required home electronic equipment via user-friendly web-based interface. Several different ways of use of the system are discussed as well as some useful features of the microcomputer.
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Provisioning implementation in Asterisk open source PBX
Král, Jan ; Bartl, Milan (referee) ; Šilhavý, Pavel (advisor)
The bachelor's thesis "Implementation of provisioning service in Open source PBX Asterisk" deals with a general description of the provisioning service and the options of it's implementation in Asterisk PBX based on the capabilities of the PBX and the endpoint devices for VoIP telephony connected to it. The theoretical part of the thesis also contains a brief description of all the protocols and services needed for successful operation of the service in the particular scenario of implementation described in the thesis. A short introduction and requirements for the designed application are also described. The practical portion of the thesis is focused on instalation and setup of the Asterisk PBX and the provisioning service itself on a virtual server running the CentOS operating system. It also contains all the settings of the server, additional services run on the server, the Asterisk PBX and also the settings of the endpoint devices needed for correct operation of the service. A thorough description of the designed and developed web application for management of endpoint devices for VoIP telephony is also contained in this part.
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Fast Beam Current Change Monitor for the LHC
Král, Jan ; Kovalsky, Jan (referee) ; Kubíček, Michal (advisor)
Striktní nároky na systémy ochrany a zabezpečení LHC vyžadují vylepšené metody detekce rychlých ztrát částicového svazku. Rychlý proudový transformátor (FBCT) je měřicí přístroj poskytující informaci o intenzitě shluků urychlovaných částic. Tato diplomová práce popisuje vývoj nového systému ochrany LHC založeného na měření signálu FBCT. Tento systém, monitor rychlých proudových změn částicového svazku (FBCCM), měří signál FBCT v úzkém frekvenčním pásmu a počítá časovou derivaci okamžité amplitudy tohoto signálu. Tato derivace je přímo úměrná ztrátám částicového svazku. Pokud ztráty svazku překročí určitou úroveň, FBCCM přikáže kontrolním systémům zničit svazek kvůli bezpečnosti LHC. Ochrana LHC bude zabezpečena čtyřmi FBCCM, které budou instalovány do LHC v červenci 2014. Bylo zkonstruováno a testováno šest FBCCM. Jejich měřené charakteristiky vyhovují stanoveným požadavkům. FBCCM bylo vyzkoušeno laboratorní simulací reálného prostření LHC.
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Thermal camera for biological applications
Macura, Jáchym ; Král, Jan (referee) ; Kubíček, Michal (advisor)
Diplomová práce se zabývá návrhem termální kamery pro biologické aplikace. V první části je popsáné infračervené záření, také známé jako thermální záření. Pokračuje popisem emisivity objektů, která hraje důležitou roli při stanovení teploty snímaného objektu. Dále je v první kapitole uveden přehled typů termálních detektorů a jejich základní vlastnosti. Druhá kapitola stručně seznamuje se zákládními hardwarovými komponenty vyvíjené kamery. V poslední kapitole je popsán celý proces vývoje softwaru. Ten zahrnuje vývoj IP jader, kernel modulů a C++ knihoven.
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Virtualization of operating systems
Král, Jan ; Malina, Lukáš (referee) ; Komosný, Dan (advisor)
The diploma thesis ’Virtualization of Operating Systems’ deals with a general description of virtualization technology and briefly discusses its use cases and advantages. The thesis also mentions examples of different types of virtualization technologies and tools, including more thorough description of the two technologies used for measurement: Docker and KVM. The second part of this thesis descibes the preparation, installation and configuration of all the tools and services that are necessary for measurement of the influence of the aforementioned virtualization technologies on network services running on the virtual machines, including analysis and discussion of the resulting data. Moreover, a custom application for fully automated measurement of the parameters of network services was created, and is also described in this thesis. The conclusion of this thesis summarizes and discusses the achieved results and acknowledges the influence of virtualization on network services, where the Docker application containers, which are with their low overhead comparable to a "bare" system without any virtualization, managed to achieve much better performance results than the traditional virtual machines on KVM.
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Thermoluminescence measurement system
Matějka, Tomáš ; Král, Jan (referee) ; Kubíček, Michal (advisor)
This thesis deals with revision and design of electronic for measuring system PSI TL 500 which is designed for measurement of thermoluminescence phenomena in photosystem II. Thesis describes principles and properties of the measuring system in its current form and changes for the new version are discussed. Digital control part based on Xilinx Zynq platform is designed. Revision of analog measuring part of system is made and partial changes are implemented.
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Influence of properties of humic acids on diffusion of cupric ions in humic hydrogels
Král, Jan ; Smilek, Jiří (referee) ; Klučáková, Martina (advisor)
Presented bachelor's thesis focuses on the study of diffusion of cupric ions in humic acid gels. The objective of the work was to assess how the properties effect diffusion in humic gels. In the experimental part, three samples of humic acids of different purity were studied. Method of instantaneous planar source diffusion was used to compare them. This methods was based on monitoring temporal evolution of diffusion profiles of cupric ions in gels. Copper ions were elected as diffusing medium because of their high affinity and strong bonds to humic acids.
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