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Computer Library with Clustering Methods
Riša, Martin ; Homoliak, Ivan (referee) ; Košík, Michal (advisor)
The aim of this work is to create a library with chosen clustering methods, to compare their effectiveness and their properties by testing them on different input data sets. The aim of the testing is to determine efficiency of a method, to determine advantages and disadvantages of a method to cluster general input data or to cluster only data of specific shapes. Stages of development of the library are also documented in the text of this work.
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Optical cableless transmission
Němec, Filip ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
This diploma thesis first handles the general issues concerning free space optics in the~atmosphere. The aim is to design and implementation of optical wireless equipment, which would serve in the laboratories of optical networks. Ronja was used as the basis for a~wireless link, which is already widespread in the world. Students will work with the device, which they may come into contact in the future. It consists several separate modules: transmitter, receiver and inteface. Each module have a separate chapter describing the~functional blocks and circuit realization. Ronja was adjusted for the needs of~laboratory tasks, where additional voltmeters measures received signal strength (RSSI) at~both ends of the link. Measuring device provides adjustment of power the transmitting LED via~computer, measures and sends RSSI values to a PC via~USB or RS232, turn off Ronja with computer. For targeting the pipes of Ronja was developed the mechanical design. In the last part of thesis the device was undergone a series of tests.
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Pulsed driver for laser diodes
Pernica, Lukáš ; Křepelka, Pavel (referee) ; Drexler, Petr (advisor)
This semestral thesis describes creation of laser radiation in the semiconductor material, the structure of the laser diode and the possibility of using power laser diodes in pulsed mode with high switching frequencies. In the thesis are described methods of casing of power laser diodes and their cooling possibilities and solutions to their switching, evaluating the pros and cons of these solutions and select the most suitable one for the best completion of all requirements.
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Optical design for LED luminaire
Oravčok, Ján ; Adamec, Michal (referee) ; Škoda, Jan (advisor)
The first part of the thesis is research, which deals with electric luminaires and especially their light-active parts. Subsequently is described the problem of a specific luminaire, which is used during the control of the surface structure of materials. The next part of the thesis deals with the simulation of the current luminaire and the simulations of the proposed solutions that eliminate the shortcomings of the luminaire. The conclusion of this thesis is the evaluation of the originally used luminaire and the benefits of the proposed solution, which showed the best results in the simulation.
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Optical polygon
Kubica, Matěj ; Münster, Petr (referee) ; Horváth, Tomáš (advisor)
Diploma thesis focuses on a problematics of an optical networks in terms of an optical cables laying and a work with individual fibers. Thesis contains an basic physical properties which are used in a fiber optics. Methodology of correct working procedures used in fiber optics is discussed at the same time. Thesis also contains detailed documentation of realized optical connections including scheme of realized outdoor connection. 3D design of an rack case is also part of the thesis. Rack case provides an option to simulate plenty of different lengths of optical routes. Rack case is designed in 6U variant.
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Marketing Strategy of the Selected Company
Šťastná, Klára ; Peterka, Jiří (referee) ; Chlebovský, Vít (advisor)
This diploma thesis deals with the elaboration of proposals for the improvement of the marketing strategy for an optician brand named Valore. Following the theoretical background, this thesis analyzes the current state of the company and its marketing strategy. Based on the findings from the analysis of the internal and external environment of the brand, as well as from a questionnaire survey, specific and feasible suggestions for an improvement of the marketing strategy are created. The proposal part of the work is mainly focused on minimization and elimination of identified weaknesses while making use of strengths and opportunities of the brand. The marketing mix method was chosen to formulate suggestions for the marketing strategy adjustments. Suggestions contain a specific description of the recommended changes that will help to raise the company's awareness and bring in new clients. The proposals are mainly focused on the unification of the current online self-presentation, which is the company's greatest shortcoming. The suggestions include drafts for a redesign of the company's website as well as custom made way of communication on social networks. It also contain adjustments of the discount policy and the use of online customer registration, which is related to customer benefits and newsletters. The proposals were made in detail, including target groups and illustrative examples, so that it could be used by the company. The company is also recommended to employ an external online marketing specialist who will manage marketing communication according to proposals and his or hers own experience. Other suggestions include the modification of the assortment at the Gajdošova shop, so as to improve the identified customer dissatisfaction. A solution is also proposed for a detected problem with an employee in one of the stores, who the company should lay off and replace with a new employee. Among the proposals is also the use of the potential of the company's electric car, for which a design of an advertising sticker is prepared, which will create an affordable mobile outdoor commercial. To save unnecessary costs, it was also proposed to cancel the current advertisement in the BRNO-STŘED magazine, because the return of the costs proved to be almost zero amount.
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Polarization mode dispersion
Turský, Aleš ; Dostál, Otto (referee) ; Filka, Miloslav (advisor)
The work deals with dispersive effects of single mode fibers. We learn about the chromatic dispersion, the main attention is paid to the Polarization Mode Dispersion. We clarify the root cause origin of the Polarization Mode Dispersion describing parameters and its effect on transmitted data. Further on, the works dedicates to measure methods of the Polarization Mode Dispersion which is the interferometric method or the POTDR method. We explain the ways of the PMD removal at contemporary optic routes and options of PMD compensation by using compensators of various types. There is also mentioned the possibility of profiting from the soliton transmission. The last chapter deals with measuring of a real optic route. It includes measured data and its evaluation due to the ITU-T demands.
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Influence of surface roughness on optical properties of machined materials
Ashqar, Ghaith ; Jaroš, Aleš (referee) ; Kupčák, Radim (advisor)
První, teoretická, část této bakalářské práce se věnuje problematikám souvisejícím s výrobou mechanických položek pro optické přístroje. Poskytuje úvod k parazitnímu světlu a přehled způsobů jeho eliminace. Následuje obecná část zabývající se soustružení a sekce věnovaná měření drsnosti povrchu. V praktické části jsou tyto poznatky zúročeny v podobě návrhu a následné výroby prototypového vzorku který bude sloužit k vyhodnocení vlivu drsnosti povrchu na množství parazitního světla v optickém přístroji. Drsnost povrchu jednotlivých vzorků byla změřena a porovnána s teoretickou hodnotou získanou výpočtem. Prototyp byl vyvinut v úzké spolupráci s R&D oddělením přerovské firmy Meopta – optika, s.r.o. Na základě budoucích zkoušek a měření bude vyhodnoceno, zda je autorem navrhovaná inovace aplikovatelná v oblasti přesné mechaniky a optiky.
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Verification of parameters of passive optical components on short wavelengths
Látal, Michal ; Filka, Miloslav (referee) ; Vojtěch, Josef (advisor)
Semestral thesis deals with the basic theoretical knowledge in the field of optics, light propagation and optical fibers. It describes in detail the optical transmission system and its associated issues, such as the attenuation of optical fibers or differently caused dispersion. The main part of this work is a description of each passive optical elements, their production technologies and applications in optical communications. Within the optical connection its radiation sources and detectors of optical radiation are explained. The last practical part is focused on the measurement of insertion loss provided by passive optical components.
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Methodology for the measurement of optical arterial network
Chleboun, Jan ; Dostál, Otto (referee) ; Filka, Miloslav (advisor)
There are methods to extend the transmission channel of optical transmission medium thanks to the development of telecommunications and informatics. Multiplex is a grouping of signals into a single transmission path and wave-division multiplexing is the best reason of use of the maximum fiber optic transmission capacity. The subject of this work is to determine whether a particular transmission path is suitable for such an extension of their capacity and how much. The answer is obtained by measuring the attenuation, the chromatic dispersion and the polarization mode dispersion, whose values are strictly limited and which determine next steps in the expansion of the transmission path, which is comprised by optical medium. Measurement methods determine the nature of the measured route and its current transmission capacities. Draft of the measurement methodology, which ensures the correct procedures during a possible transition to higher speeds is the output of this work. Thanks to the acquired characteristics of the BAPS (the Brno Academic Computer Network), the bit rate 40 Gb/s can be provided on this part of the network under the conditions of the introduction of certain countermeasures, particularly the exchange of a connectors on the measured optical lines. As for the back reflection lines in excess of the standard recommendation and pre-emptively on the lines with values with still agree with the return loss. Countermeasure for limiting of the chromatic and the polarization mode dispersion are do not need to stand in the way of a planned transition to a higher rate of the BAPS.
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