|
Measurement of the optical fiber
Procházka, Jakub ; Dostál, Otto (referee) ; Filka, Miloslav (advisor)
This bachelor's thesis deals with measurement methods of optical fiber. In the thesis, methods for measurements of attenuation, chromatical dispersion, and polarization mode dispersion are discussed. The thesis also deals with methods for measurement of attenuation of passive components and their reflections loss. Also discussed are parameters of selected types of optical fibers, basic findings about optical transmission and principle of wave multiplexing. The practical portion of the thesis deals with measurement of a new optical polygon in the Academic Optical Network in Brno.
|
|
Assemblying effect on cable lines quality
Dočkal, Martin ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
In the first part is explained what actually a structured cabling is. Its beginning, from what and why it was created. Its history when at the beginning were applied unbalanced coaxial cables, those were later replaced by balanced cables. In cabling for TVs are still used coaxial cables. Balanced cables are according to type named UTP, STP, FTP, and so on. Whit growing popularity of this type of cabling and its wide spread application was necessary to set some rules, standards, specifications and demands, how to build up the cabling from project to realization. According to these rules is the system built so there are strict rules for length of subsystems and interfaces and the whole appearance of the structure cabling. Next important point is projecting of cabling that is related to the previous points and when it’s finished, we should strictly follow it. With the project is closely connected characteristic of this cabling as attenuations, cross-talks and other transmission parameters which are measured in the practical part. In the second part is spoken about all the parts of which the structured cabling consists - metallic and optical connecting elements and cables. There are also mentioned their mechanical, electrical and transmission features. In the third part is described influence of man on the quality of structured cabling and the most common causes of lower quality and the ways how to prevent this from happening and how to manipulate with cabling not to destroy it. The final (fourth) part considers the measurement. There are measured qualities of metallic wires as the attenuations, delay, cross-talks on the near- and far-end, impedance and resistance. To all the features are mentioned schemes of the measurement on the twisted pairs. The measurement is divided into two parts. In the first part are measured five types of balanced cables of different length, category and damage influencing quality of these cables. In the second part is measured one balanced cable if it’s corresponding with category 5 for that t was made and if it would be possible to use it also for higher category 6. Values are tabularly sorted in tables.
|
|
Standards for application of polymer optical fibres
Stiburek, Martin ; Tejkal, Vladimír (referee) ; Šporik, Jan (advisor)
The aim of thesis is description of polymer optical fiber (POF). In particular, focusing on their application and its associated standardization. After explaining the principle of signal transmission by polymer fibers, glass fibers are compared with the polymer fibers. The attention is then paid to the types of POF and their connectors. Another part is engaged in standards of polymer fibers, according to their area of application. Following chapter describes the application of polymer fibers in practice, especially in the automotive industry and sensor technology. Standalone chapter is dedicated to deploying POF fibers in LANs. It mentions comparasion with copper and wireless networks, summarizes the advantages and disadvantages. Chapter also provides an overview of the components used in POF - optical converter, switch with optical interfaces, optical network card, etc. In the practical part is created the design of home network for two-storey family house. The proposal was implemented by CableProject CAD software, first using copper cabling (UTP category 5e) and then using polymer fibers. Finally, both proposals are compared with each other. It has been made detailed financial analysis, compared performance of instalation and methods of cable instalallation. The practical part is also dedicated to measuring the parameters of POF networks, the impact of the attenuation loss, explores methods of joining glass and polymer fibers and is engaged in IPTV transmission simulation in real conditions.
|
|
Concessive connectives pourtant, cependant, toutefois, néanmoins, quand même, tout de même in French
Štěpánová, Veronika ; Nádvorníková, Olga (advisor) ; Mudrochová, Radka (referee)
Key words: connective, concession, concessive adverb, concessive connective, compétition Abstract: The diploma thesis "Les connecteurs concessifs pourtant, cependant, toutefois, néanmoins, quand même, tout de même" consists of three parts. The goal of the first part was to explain the notion of "concessive connective" (connecteur concessif) in a synchronic perspective. This first part consists on one hand in an attempt to explain the concessive relation (concession), on the other in a definition of the category of concessive connectives used in temporary French. The second part of this diploma thesis is dedicated to a diachronic and quantity-based study of the examined quasi-synonyms for the purpose of clarification of their frequency and competition regarding their usage down to the present day. In addition to these two parts, we reflect in the third part on the current use of concessive connectives, i.e. their use in contemporary written, spoken and pseudo-spoken language (on the Internet).
|
| |
|
Extensible measurement socket placement optimalization with respect to the higher number of conductors
Šindler, Matěj ; Čepička, Martin (referee) ; Wasserbauer, Vojtěch (advisor)
In opening, this bachelor thesis is describing structure and basic block description of UniGear switchgear manufactured by ABB company. Then this thesis focus on current and voltage transformers and sensors often used in this type of switchgear. Main part of this thesis is dedicated to evolution and description of connector, used in connection solution of withdrawable metering unit with low-voltage compartment. Next part states the main requirements for new connector, that will replace current connector in future solution. In following part there is a list of different options for new connector with their biggest strengths and weaknesses pointed out. Then there is list of alternative placements for new connector. In final part is chosen and described new connector and its placement. This solution is valuated and backed up by created 3D models.
|
|
The Issue of Connectors in Contemporary French
Burešová, Tereza ; Loucká, Hana (advisor) ; Sládková, Miroslava (referee)
The thesis deals with the issue of connectors in contemporary French. The first part offers an outline of different approaches to the term connector/connecteur within Czech and Francophone linguistics. Based on the description and comparison of individual authors' approaches classified by the theoretical aspects applied, this part explains functioning of connectors not only within the logical semantic coherence relations, but also within the hierarchisation of utterance content considering the pragmatic dimension of the text. The second part of the thesis defines the term "connector" with respect to the approaches introduced above. The third part of the work deals with the characteristics and function of concessive connectors. It is based on defining the concessive relations, it describes their different aspects of meaning conditioning the relations classification within logical semantic relations in Czech and French and offers a list of linguistic means to express them and at the same time, it stresses the complex functional character of the connectors.
|
|
Web Search Engine
Tamáš, Miroslav ; Galamboš, Leo (advisor) ; Skopal, Tomáš (referee)
Academic fulltext search engine Egothor has recently became starting point of several thesis aimed on searching. Until now, there was no solution available to provide robust set of web content processing tools. This master thesis is aiming on design and implementation of distributed search system working primary with internet sources. We analyze first generation components for processing of web content and summarize their primary features. We use those features to propose architecture of distributed web search engine. We aim mainly to phases of data fetching, processing and indexing. We also describe final implementation of such system and propose few ideas for future extensions.
|
|
Attitude discourse markers: a contrastive analysis of selected texts
BROŽOVÁ, Kristýna
The aim of this Master´s thesis is the contrastive analysis of discourse markers on a selected type of texts in Spanish and Czech language. The thesis is divided in two parts theoretical and practical part. Firstly, in the theoretical part of the thesis, is introduced the textual linguistic the field which studies discourse markers. For wholeness, are briefly mentioned all of the seven standards of textuality with profound focus on textual coherence. Other part of the thesis aims on terminology of discourse markers (especially on conectores), which is problematic, and various classifications according to Czech and Spanish authors. The last part of the theoretical part is dedicated to attitude markers the main theme of this thesis, their characteristics, functions and examples. The practical part of the thesis is introduced by contrastive analysis of attitude markers carried out on selected sample of texts. Firstly the attitude markers are identified and secondly described and classified. Also is mentioned the absolute and relative frequency and comparison of the contrasts and coincidences in both languages. The thesis is finally summarized in Spanish résumé.
|
|
POF - Polymer optical fibers
Janovský, Marek ; Šifta, Radim (referee) ; Filka, Miloslav (advisor)
This document informs readers with polymer optical fibres (POF). The first section summarizes basic properties and differences between polymer and glass optical fibres. The second section contains list of POF types, their differences in the structure and refractive indexes. Further is described preparation of fibre surface for connector pin and connector types, which are used for POF. Next section contains usage of POF in access networks, types of access networks and FTTx network types. The document continues design of FTTH, FTTB and LAN for home application. The practical part deals with basic measurements with POF, production of coupler and measuring response at test ranges. The final section summarizes the overall findings and results.
|