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NAT64 Performance Evaluation
Pokorný, Jan ; Veselý, Vladimír (referee) ; Grégr, Matěj (advisor)
Tato práce se zabývá problematikou přechodu mezi IP protokolem verze 4 a IP protokolem verze 6. Přechod je možné řešit více mechanismy a tato práce je zaměřená na přechodový mechanismus Stateful NAT64. Cílem práce je otestovat různé implementace NAT64 a najít vhodnou implementaci pro router NETX. Za cíl bylo stanoveno najít implementaci, která bude dosahovat propustnosti 10 Gbps. Několik NAT64 implementací bylo zkoumáno v testovacím prostředí. Měření probíhalo pomocí nástrojů Iperf a PF_Ring. Bylo změřeno několik různých druhů síťového provozu tak, aby bylo z výsledku patrné, jaký výkonnostní dopad má každá z testovaných implementací. Z naměřených výsledků Jool vyšlo jako nejvhodnější NAT64 řešení. Jool splnil požadovanou propustnost a zároveň kromě stále aktivního vývoje nabízí i další pokročilé vlastnosti. Jool byl integrován do routeru NETX. Byla navrhnuta struktura příkazové řádky pro manipulaci s Jool instancí, která byla posléze implementována jako rozšíření NETX příkazové řádky. Dále byl vytvořen postup distribuce potřebných balíčku skrze balíčkovácí systém RPM, tak aby zapadl do automatizovaného systému platformy NETX.Výsledkem práce je plná podpora přechodového mechanismu NAT64 na platformě NETX dosahující propustnosti blízké 10 Gbps.
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Analysis of structures of compact hydraulic equipment
Sordyl, Martin ; Pokorný, Jan (referee) ; Pokorný, Přemysl (advisor)
The subject of this thesis is realization of short research of current compact hydraulic power unit, realization of FEM analysis with aim to find inappropriately dimensioned parts of structures. Based on this data design optimized solution of structures and create drawings of weldments. This thesis is carried out in cooperation with company Bosch Rexroth, spol.s.r.o.
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Low-cost sensors for measurement of particulate matter
Dvořáková, Michaela ; Pokorný, Jan (referee) ; Lízal, František (advisor)
This work focuses on the research and comparison of several types of low-cost sensors for measurement of particulate matter. It clarifies the principles of aerosol particles measurement and focuses on the reasons of using low-cost sensors. It provides basic information about the impact of aerosols on human health. The experimental part of this work compares quality of the obtained results considering the price of the respective devices.
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Workplaces with the interchangeable modular manufacturing table
Šnédar, Jan ; Pokorný, Jan (referee) ; Kašpárek, Jaroslav (advisor)
This diploma thesis deals with the design of modular production interchangeable machine for fuel hub assembly based on customer requirements and standards for safety and ergonomics. The thesis also includes a conceptual design of a universal machine for setting up different versions of modular production interchangeable machines and a drawing documentation of selected assemblies and manufactured parts.
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Analysis of the use of the "instant center of rotation" method in the calculation of atypical welds in numerical computational modeling
Babišta, Jan ; Pokorný, Jan (referee) ; Vosynek, Petr (advisor)
The usage of welding for connection of two materials is common method for its speed, economy and its potential automatization. But when the statically loaded weld connection is designed and simulated using FEA, the singularity appears, so the deformation and stress can’t be presented as relevant. For elimination of this influence the Instantaneous center of rotation (ICR) method can be used. This method assess only the angles of reaction force from segments of weld. This thesis is focused on the effect of material, geometry, loads, supports and magnitude of loading force on the position of ICR. In the first part of thesis, the ICR method is compared with elastic method, which is the other potential method for weld assessment. The basics of each method are presented. For the second part, the normativ design of weld is created and assessed using both of potential methods for solution. The numercial model is created in the next step. The model is then calculated for numerous combination of materials, geometry, FE mesh and loads. Last part of this theses the results are compared between numerical and analytical solution of position of ICR. Also the best combination of geometry and material was chosen for the best results.
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Compensation of missing air resistance while running on a treadmill
Švejdová, Monika ; Pokorný, Jan (advisor) ; Procházka, Michal (referee)
This work is focused on compensation of missing air resistance while running on a treadmill. The aim is to find the possibilities of compensation and its verification by a slight inclination of the treadmill. For the verification, we used the heart rate values of (6) probands obtained while running on a treadmill with different grade and while outdoor running at the same speed. The output of this thesis is the determination of the treadmill grade compensation at speed of 10,5 km/h and 13,5 km/h.
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Hydromorphology as a component part of ecological condition of water bodies
Kujanová, Kateřina ; Matoušková, Milada (advisor) ; Lehotský, Milan (referee) ; Pokorný, Jan (referee)
Today, the study of fluvial-morphological processes is focused on evaluating hydromorfological status of streams and on proposing restoration measures. A fundamental prerequisite for assessing the current hydromorphological status of streams is establishing reference conditions for each stream type that serve as a benchmark and represent the target status after restoration. The aim of this thesis is to describe type-specific hydromorphological reference conditions for rivers on the territory of the Czech Republic with the help of determining river types, developing the REFCON method for establishing reference sites and recording characteristics of reference status. The approach to establishing reference sites is based on meeting the criteria of having minimal anthropogenic impact that are first assessed using cartographic data and subsequently verified through field survey. Parameters - altitude, sinuosity, and valley floor slope - for classifying river reaches into types were determined on the basis of the results of statistical methods applied on 3197 river reaches covering the whole territory of the Czech Republic. The classification of river reaches into 9 river types was verified through field survey at 44 sites. Detailed field survey and measurements of characteristics of natural channel...
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