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Preparation of LiNbO3 nanostructures and their characterization
Pikna, Štěpán ; Jelínek, Michal (referee) ; Dvořák, Petr (advisor)
This master thesis is focused on the deposition of LiNbO3 on c-cut Al2O3 substrate. This material exhibits an electro-optic effect, which refers to the change in the refractive index upon the application of an external voltage, and it has extensive applications in electro-optic modulators. Currently, there is significant interest in miniaturizing these devices for use in the fields of meta-optics and photonics, where its transparency is also advantageous. The first part of this thesis is dedicated to a review of the electro-optic effect and its application in optical metasurfaces. Subsequently, the review addresses the pulsed laser deposition of LiNbO3. The practical part begins with the optimization of target fabrication from LiNbO3 wafers using a laser cutter. Following this, the measurement of the electro-optic effect from a monocrystalline LiNbO3 wafer is discussed. The final section is devoted to the deposition of this material onto a sapphire substrate and further analysis using SPM, XPS, XRD, and SEM. Monocrystalline growth of 30 nm grains was observed, and the physical dependencies of the growth was studied.
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The Evaluation of the Company's Financial Performance Using the Benchmarking Approach
Jelínek, Marek ; Luňáček, Jiří (referee) ; Kocmanová, Alena (advisor)
The content of this thesis will be the measurement and subsequent evaluation of the financial performance of a selected company through benchmarking. The overall work will be divided into theoretical, practical, and the final proposal sections. The theoretical part of this conclusion will describe relevant concepts and the application procedures of benchmarking. In the subsequent analytical section, the company will undergo analysis and measurement using the methods described earlier. In the final concluding section, specific proposals for improving the financial performance of the company will be presented, along with minimizing the identified problems.
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Planning and design of web-based application for students' knowledge verification
Meixner, Jaroslav ; Jelínek, Mojmír (referee) ; Molnár, Karol (advisor)
The aim of my bachelor thesis is proposal and realization of system with web interface which automatizes student’s testing using randomly generated quizes. The generation of unique quiz with mutually mixed set of questions and answers for every student is very important condition. This set consists of several correct or incorrect answers. System Moodle was chosen for creation of quizes. This system goes on open source platform and it is possible extentend and modificate if some changes are necessary. System Moodle is corrected properly according to requirements and its correct behaviour was verified in subject Practical exercises in information networks
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Evaluation of the Financial Situation of a Company and Proposals for Improvements
Jelínek, Marek ; Hornungová, Jana (referee) ; Poláček, Tomáš (advisor)
The aim of this bachelor thesis will be to use selected methods of financial analysis to evaluate the current level of the financial situation of the company for the period between 2016-2019. This work examines, estimates, and evaluates the current financial health of the company, strengths, and weaknesses, and based on the data and data proposed measures to improve the financial situation in the company In the theoretical part of this diploma thesis, data, procedures, and the overall theoretical approach to financial analysis will be clarified and approached. In the second, practical part, the work is devoted to a specific company, in this case, Pohankový mlýn Šmajstrla s.r.o and based on accounting documents and financial analysis procedures of this company, there will be an assessment of the current financial situation of the company, its strengths, and weaknesses. At the end of this work will be presented own proposals to improve the financial health and situation of the company.
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Establishment of the graphic interface for firewall using Qt4 framework
Štefany, Martin ; Jelínek, Mojmír (referee) ; Matocha, Tomáš (advisor)
The aim of this thesis is to design an application, which will serve as a~graphical interface to the terminal application iptables. iptables is an application which uses the Netfilter framework for managing firewall in operating system GNU/Linux. Graphical interface is a~way how to raise a~comfort of firewall configuration and management, because user doesn't have to remember all of the commands and graphical interface also shows him actual structure and contents of the firewall in a~tree view. Thesis describes format and options of the commands and also the firewall structure and its function in Linux. Designed application is written in C++ language using aspects of object oriented programming and uses Qt4 framework. Qt4 is a~great framework for creating graphical user interfaces, brings a~lot of new classes and methods and extends programmer's possibilities during designing graphical or terminal applications for lots of platforms. Thesis also includes a~manual to designed graphical interface, to the application qIPtables, which user can use to learn the basics of using this application and firewall management.
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Virtual environment by Xen software
Kulíř, Tomáš ; Kouřil, Jiří (referee) ; Jelínek, Mojmír (advisor)
This bachelor thesis, which is called the virtual environment by Xen software, deals with the operating system GNU / Linux and its distributions. It also deals with the virtualization on the server or desktop computer, in particular, describes in detail the Xen environment, including all of its options and the most forgotten server services. In the first chapter is analyzed the concept of GNU / Linux. First, there is documented history. Another section deals with a brief overview of the most commonly occurring distributions. The main part of this chapter is primarily devoted to a specific distribution Debian. There is described not only the history and development of this distribution, but also more packaging system is analyzed there. The last part of this chapter is devoted to the installation options with a detailed description of the whole process step by step. Second and the most important chapter is devoted to virtual environments. Once again, there is first described their history, the possibility of practical use and the types of virtualization are also indicated there. Reader will find there a brief analysis of the most commonly used virtualization systems. The third chapter detailed deals with the Xen technology. There is not only explained the principle on which the virtualization is built, but the main part of this chapter focuses on the practical use and a summary of basic functions. The next section describes the installation and administration of hypervisor including previous preparation. A very important point is also creation of the virtual machines and their control, their migration to another physical hardware or a description of the installation of other operating systems than Linux. Fourth, shorter chapter deals with a listing and a brief description of server services. The final chapter consists of a summary of problems or complications, which in the course of this work occurred.
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The AmBe Laboratory Neutron Source Field Determination Using Experimental Stend
Jelínek, Martin ; Šťastný, Ondřej (referee) ; Katovský, Karel (advisor)
This master’s thesis provides a comprehensive overview of the conventional neutron sources from the perspective of reactions which lead to the production of neutrons, advantages, disadvantages, properties and their possible utilization. In the relation to the assembly of the laboratory neutron source and the unique experimental stand “Candle” basic methods of the neutron field analysis are outlined and two of them, the neutron activation analysis and the calculation using the MCNP software code are discussed in depth to apply and compare these methods. The experimental part deals with the realization of neutron activation analysis from its design itself, through gamma spectrometry to the cadmium ratio calculation. In compliance with the measurements, a calculation with MCNP code was run and both methods were evaluated and compared. The computation is complemented with the analysis of radiation situation on the borders of the supervised area, which is compared to the legal limit.
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Suggestion of a Company Communication Mix
Sombergová, Markéta ; Jelínek, Martin (referee) ; Kaňovská, Lucie (advisor)
The diploma thesis focuses on problems associated with the suggestion of the communication mix of the Fitness centre „Kameňák“. It includes evaluation of the current state of company´s communication mix and revelation of problems in this field. Afterwards the thesis contains suggestions for improvement of this state. The diploma thesis is divided into three parts. The first part contains theoretical knowledge of the subject, the second part is focused on analysis of the company´s current state and the main content of the third part is suggestion of such a communication mix that can help the company present better its services and brings more customers.
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