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Evaluation of a switching device behaviour during short-circuit current
Fendrych, Martin ; Dostál, Lukáš (referee) ; Valenta, Jiří (advisor)
At work, I focused on the principle of electric arc extinction in low voltage devices. I particularly focused on the issue of magnetic switches. Next, I processed by the theory site issue of contact system in magnetic switches. In the practical part of my work, I was testing modular low voltage circuit breaker type of 2B and 10B. Testing was carried out in the laboratory of switchgear. I observed the movement of the contact and electric arc, which was burned between them and conductor wall. Observation was recorded by using a high-speed camera and an oscilloscope. Of acquired waveforms, I evaluated the dynamics of contacts, electric arc length and the value of the arc voltage for different moments.
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Modernization of the master clock for slave clocks controlling
Pokorný, Jiří ; Číž, Radim (referee) ; Krajsa, Ondřej (advisor)
This diploma thesis describes modernization of the master clock HN 50 created by company ELEKON, s.r.o. Master clock can be used for controlling of analog or digital slave clock or for switching school bells. Exact differences between old and new version of the clock are described and ways of synchronization and controlling of slave clock are explained. Main goal of modernization is applying the SMT technology for automation of production. Another problems and shortcomings of previous version are developed, such as new power supply structure, selection of a new microcontroller and usage of several different displays. Every problem is developed and new solutions are chosen. Last part of the document describes the software which is clarified on several flowcharts. Outputs of the thesis are complete schematics, printed circuit boards and 3D models of the modernized device.
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Contiki NTP Client
Luštický, Josef ; Čejka, Rudolf (referee) ; Kašpárek, Tomáš (advisor)
This BSc Thesis was performed during a study stay at the RheinMain University of Applied Sciences in Wiesbaden, Germany. The purpose of this thesis is to describe the operating system Contiki for embedded systems, NTP time synchronisation protocol and to design and implement an NTP client for the Contiki operating system.
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Activity Tracking Tool for Windows Phone
Munk, Filip ; Kajan, Rudolf (referee) ; Herout, Adam (advisor)
This bachelor thesis describes the development of mobile application for Windows Phone focused on activity tracking. Result of my work is elegant and efective application, that functionality supports user’s fast interaction. Application allows to save exported data to SkyDrive.
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Time-Serie Mining Module of a Data Mining System
Klement, Ondřej ; Bartík, Vladimír (referee) ; Zendulka, Jaroslav (advisor)
The subject of this master's thesis is extension of existing data mining system. System will be extended by the module for the time series data mining. This thesis consists of common introduction to data mining issues and continues with time series analysis. Thesis then also contains some of the current tasks and algorithms used in time series data mining, follows by the concept of the implementation and description of the choosen mining method. Possible future system's improvments are disscused at the end of the paper.
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Sustainable Public Space and City
Krištof, Michal
The research focuses on the problem of public space in the times of growing ecological demands, global supercapitalism and social networks on the internet. In today’s changing society many original functions of archetypal public space disappeared or moved into other spaces. What can a public space offer to a city of the 21st century? Furthermore, is the public space sustainable? If so when? The research uses a systematic overview on all of the aspects of sustainability of public spaces: economic, ecological, social and time dimension. The paper proposes several model studies and principles of sustainable public spaces where the public space is a valuable part of city’s structure. On the other hand, it also shows examples where the public space is definitely not sustainable. The paper contains research results of respective aspects of sustainability, followed by the conclusion.
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Hyperspeed Reach - Audiovisual Performance
Kočišová, Lenka ; Vojtěchovský, Miloš (referee) ; Skočovský, Luděk (referee) ; Palla, Marian (referee) ; Ruller, Tomáš (advisor)
This dissertation thesis describes the phenomenon of audiovisual performance in different connotations. A substantial part is devoted to psychological survey into my own subconscious and subsequently to metaphorical processing of this introspection. An important part of the work is a resume of the general knowledge of the physical properties and its metaphorical application on mental and creative processes. This analysis and explanation of internal cognitive models are implemented in terms of the study of relationships, interactions based on cooperation or confrontation, but also the inability to grasp the objective reality from the subjective position due to the merged distinctions of real and fictional. The importance of audiovisual performance is also studied in linear perspective of history, in order to point out the general principle of repetition patterns, which reveals that audiovisual performances is an activity which is a necessary expression of life itself and not just the concept in the field of arts.
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Line protection against overload and short circuit
Konšel, Ladislav ; Vaněk, Jaromír (referee) ; Valenta, Jiří (advisor)
This work includes a theoretical treatise on the operation of electrical wiring for the overload and short circuit. This is mainly on thermal effects of over current and their influence on the properties of conductors and insulation. Work Includes links to determine the load current, depending on the properties of leadership and its surroundings. It also deals with the protection of conductors against overload and short circuit. The work includes measurements process of warming wires. Practical project of proposal circuit is created using SICHR. The project includes proposals of conductor’s sizes and safety components for both residential building and individual flats.
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