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Development of pressure switch for rail vehicles
Havelka, Ondřej ; Tůma, Jiří (referee) ; Tůma, Zdeněk (advisor)
This diploma thesis deals with the design of pneumatic pressure switch with adjustable hysteresis. In the thesis is carried out the introduction in the theory of compressed air and research of the pressure switches at the market. Based on the gathered information and customer specification, the design draft of the pressure switch has been created. In the thesis are described three main parts of the prototype: transform of the pressure, adjustable hysteresis and synchronization of the microswitches. In the end of the thesis is described the testing of prototype and summary of the results.
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Proposal for Optimization of Servers Using Virtualization and Consolidation
Havelka, Ondřej ; Sedlák, Petr (referee) ; Ondrák, Viktor (advisor)
The purpose of master's thesis is preparing the proposal for optimization of servers using virtualization and consolidation. The master's thesis is divided into three parts. The first one is engaged theoretical ground of computer network, second part analyses the current state of IT infrastructure within the specific business. The last part contains the proposal to modernization and optimization of existing server solution including summary of expected costs for realization od proposal.
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Detection of VoIP Applications in Network Statistics
Havelka, Ondřej ; Tobola, Jiří (referee) ; Žádník, Martin (advisor)
VoIP applications allow us fast and cheap communication over the internet. Due to the massive expansion of these applications in last few years, there is growth of VoIP traffic, which is needed to distinguish from other traffic. Detection of VoIP applications is related to data monitoring and network traffic classification. The work focuses on detection of these applications: GTalk, ICQ, Skype, WLM a Yahoo. There are presented two detection techniques. First of them is based on behavior of VoIP applications. This technique uses the statistical characteristics of network flows as packet frequency and packet size. The second method is based on searching for patterns in packet contents. These packets carry voice data using protocol RTP. Both techniques were experimentally verified and the results are presented in the work.
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VoIP Quality Analyzer
Havelka, Ondřej ; Žádník, Martin (referee) ; Tobola, Jiří (advisor)
This master thesis deals with the design and implementation of an application for analyzing Voice over IP quality using NetFlow. In the beginning, there is summarized basic information about VoIP technology and NetFlow - its principles, the most used protocols, factors that have influence on call quality and call quality rating methods. Later there is presented proposal of application and then described its implementation. The created application was tested on samples, which simulate calls in network with delays and packet-loss. Within testing was made the comparison with commercial application and the results are discussed.
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Production of assembly jigs by Fused Deposition Modeling method
Havelka, Ondřej ; Dvořáček, Jan (referee) ; Nejedlý, Jindřich (advisor)
This bachelor thesis describes the design and manufacture of assembly jigs for the production of LCD TVs in the company Wistron Infocomm (Czech), s. r. o. In the thesis was carried out to assess the current status of use of assembly jigs, design and creation of two prototypes of assembly jigs. The work includes testing, choice of method of manufacture, their routine use in the production and evaluation of results. The work also include literary studies describing RapidPrototyping technology and its various methods.
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Air freight transport between Europe and Australia - the latest development and trends
Havelka, Ondřej ; Hinčica, Vít (advisor) ; Mervart, Michal (referee)
The thesis addresses the topic of the latest trends in air freight transport between EU and Australia and the development in the last years. The introductory chapter presents the historical development and specifics of this mean of transport. The following chapter introduces the chosen regions and deals with the contractual relations between them. The last chapter discusses the current trends between the chosen regions - major market players, flight routes, structure of transported freight and safety requirements.
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