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QoS in UMTS
Kavan, Radovan ; Hanus, Stanislav (referee) ; Kejík, Petr (advisor)
This thesis treats of QoS (Quality of Service) in UMTS system. The term quality of service is frequently used, recently, however not only in computer networks, but also more and more in mobile networks also. Present system of 2nd generation (2G) GSM enables only limited exploitation of QoS function. System UMTS is a system of 3rd generation (3G) already and contains quality of service in greater measure which is ensured with number of algorithms and functions. Individual QoS functions enable effective utilization of radio interface, support maintenance of planned coverage and offer high spectral efficiency. Functions that cater to quality of service are called RRM functions (Radio Resource Management). There exist five basic functions in UMTS system that are Admission control (AC), Power control (PC), Load control (LC), Handover control (HC) and Packet scheduler (PS). These functions are responsible for control of network access, control of power, control of network load, control of handover and packet (bit rate) scheduling. Last three functions are usually collectively designated as Congestion control, control of network overload. UMTS layer model, differentiation of services, traffic classes and 3GPP concept are also discussed. In thesis the attention is piad to Admission control algorithm – control of network access – in the uplink direction and to different ways of load (in the cell) modeling. Individual approaches are simulated in MATLAB. A possibility of using algorithm in the real system is discussed in conclusion.
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Measuring temperature inside PC
Rataj, Tomáš ; Kolka, Zdeněk (referee) ; Michálek, Václav (advisor)
This master’s thesis deals with measuring temperature inside personal computer. The main goal of this work is to develop tool which is able to measure temperatures in several places, display a store the values. Theoretical section is concentrated on selection of temperature sensor, that have suitable interface for microcontrollers and has sufficient accuracy for this application. In next part there is complete hardware and software design of instrument. Software solution is based on real-time operating system. Device is projected as a battery-operated compact tool. With created application for personal computer, measured data can be downloaded through USB and displayed in graphic format.
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Effect of optical connectors quality on transmission
Bernkopf, Miroslav ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
This diploma thesis deals with optic fiber connectors and their influence on transmissions realized via fiber optics. Optical fibers and lightguides play the key role in telecommunications because of constant demands of higher bandwidth and data rates. Original metalic wires do not meet market requirements and so the fiber optics are more and more being used. There are various types of fibers and there are also many ways of connections. This work deals with demountable way of connection – optical connectors, which have the biggest influence on a total attenuation and route length. Connector has to meet various requirements such as cleannes, quality, mechanical construction and ferrule polishing.
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Thermoplastic composites for automotive applications
Zbončák, Marek ; Pospíšil,, Ladislav (referee) ; Jančář, Josef (advisor)
Diplomová práca sa zaoberá prípravou teromplastických kompzoitov s PMMA a PC matricou s potenciálnym využitím v automobilovom priemysle. Ako výstuž boli použité krátke sklenené, uhlíkové a PBO (poly(p-fenylén benzobisoxazol)) vlákna známe pod obchodným názvom Zylon®. Práve do PBO vlákien boli vkladané veľké nádeje vzhľadom na ich ohromujúce mechanické vlastnosti. Vplyv objemového zlomku vlákien na modulu pružnosti, pevnosť a ťažnosť kompozitov bol skúmaný. Experimentálne zistený modul pružností bol porovnaný so semi-empirickým Halpin-Tsai modelom. Prídavok sklenených a uhlíkových vlákien viedol k značnému zvýšeniu modulu pružnosti. Ukázalo sa, že po istej hodnote objemového zlomku dochádza k poklesu pevností kompozitov v dôsledku zvyšujúceho sa počtu defektov. Prídavok PBO vlákien preukázal len nepatrný vystužujúci efekt. Viskoelastické vlastností kompozitov boli skúmané pomocou dynamicko mechanickej analýzy (DMA). Termogravimetrická analýza (TGA), konfokálna laserová rastrovacia mikroskopia (CLSM) a rastrovacia elektrónová mikroskopia (SEM) boli využité k štúdiu štruktúry kompozitov.
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Untitled Toy
Ambrůz, Kryštof ; Artamonov, Vasil (referee) ; Cenek, Filip (advisor)
Instalation is dedicated to nature, materials and technology. Using the post-internet aesthetics, i want show form which is not usual in our art environment. By creating imaginery laboratory, easily say place where the things arise or where we working on it, and with planed layout i want evoke impression like from the memorial places. Main place in this memorial occupies a table where every work from this year araised.
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Design and production of a plastic komponent
ČÍŽEK, Václav
The theoretical part is focused on evaluation of chosen ?essential? plastics used in the car industry. The principles of construction and proportioning of plastic components, basic conception of injection moulding and measuration follow. Another section of the theoretical part presents a summary of possible CAD systems, which are used. The practical part is focused on a particular plastic moulding. It includes the main description of a component with its material choice in dependence on the component function. Another section contains evaluation of the component complexity from the viewpoint of moulding, and a possible substitution of constructions, which could be productively simpler, is shown. The whole thesis is completed for better lucidity by pictures, drawings, and mechanical drawings.
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Media education and media influence on youth
LILÁK, Karel
Bachelor´s work is focused on the questions of the medial education and the medias themselves. This work also investigate with the influence of the action of medias to the students of apprenticeship. The first part of the theoretical work has generally explains what is media education, what is its significance for society and for the benefit of education in school. They are given functions, types and objectives of media education and communications capabilities via the media. The second part of the theoretical work deals with the basic psychology of youth aged 17 to 20 years, describes the psychological and intellectual development of the group's personality traits and social relationships. The third part of the theoretical work deals with the media themselves, their division and thus how they affect youth. It focuses on the influence of the Internet, television, computers and computer games. The practical part of the paper presents results of a questionnaire, which was presented to college students, automotive and technical Secondary Technical School in the Czech Budejovice. The questionnaire was to determine how the choice of media (television, computer, internet, social networking, books and printing) for youth work, instead they occupy in their lives, to what extent they are used and preferred.
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Experiments supported by IKT
JANOUŠEK, Petr
Theoretical part of the bechelors work describes thermodynamic laws, enlightens features of Stirling´s engine, its functions and basic principles. Practical part handles sensor design with possible computer connection and solution of measuring systems.
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Project and realization power tools control with PC
ČEJKA, Jan
My diploma thesis is concerned with the scheme, constructive solution and implementation of the prototype and project. Via PC with the help of a circuit ASIX FT232BM, the prototype operates a ATTiny2313 microcontroller, which enables switching of the power part and PWM modulation outputs.The project describes operating by a programmable terminal AMIT APT3100(S) connected to a PC, and the wiring of a basic safety-loop and several measuring devices.
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Carbon Capture and Storage Technology in Energy Industry
Šulcová, Anna ; Melichar, Jan (advisor) ; Dvořák, Antonín (referee)
Given the growing worldwide interest in fossil fuels on one hand and mitigation of climate change on the other hand, it is necessary to research into new technologies as Carbon Capture and Storage. This technology became a matter of interest as an option to diminish greenhouse gas emissions of power plants. It is essential to find out about the costs of Carbon Capture and Storage and expected future costs of power plants with CCS. Impact of this techology is not only in the sphere of capital and operational costs, but it also influences power plant efficiency and fuel consumption in negative way. Analysis of reductions in the costs of this technology as a result of learning-by-doing is observed on Experience Curves. This study observes influence of CCS on costs of mainly PC, IGCC and NGCC type of power plant. CCS technology has positive impact not only on environment, but it is possible to assess Enhanced Oil, Methane or Gas Recovery, which can partly offset costs of this technology.
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