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Implementation of Delta-t Transport Protocol
Chovanec, Zdeněk ; Marek, Marcel (referee) ; Koutenský, Michal (advisor)
Transportní protokol Delta-t se v současné době vyskytuje pouze ve formě návrhu. Cílem této práce je vytvoření implementace protokolu v prostředí Linuxového TCP/IP zásobníku. Implementace bude mít formu zásuvného modulu. Protokol Delta-t patří mezi protokoly zajišťující obousměrný spolehlivý přenos. Protokol přichází s velmi jednoduchým a efektivním způsobem správy spojení. Spolehlivé sestavení a ukončení spojení není realizováno prostřednictvím handshake zpráv. Aktuální stav spojení je dán pouze dobou, která uběhla od posledního přijetí či odeslání datového segmentu. V ostatních aspektech se Delta-t podobá protokolu TCP, a proto budou jejich implementace vzájemně porovnány.
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Plasmonic structures fabricated by e-beam lithography
Šimík, Marcel ; Urbánek,, Michal (referee) ; Krátký, Stanislav (advisor)
The presented study deals with the process of the formation of plasmonic structures using electron beam lithography. The main aim of this work is to create a structure published in NatureNanotechnology using PMMA resist. It has been created several variants of these structures with different exposure doses and shapes in order to determine the best option. From these variants it is concluded which one is the most effective by using optical and electron microscopy. With this information are created and evaluated large-scale exposure.
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Study of Order Processing in the Business Company
Lesonický, Michal ; Koutný, Marcel (referee) ; Jurová, Marie (advisor)
The bachelor thesis is focused on study of contract award in selected business company. In my thesis I deal with a therotical part first. Then I introduce company LX servis Group s.r.o. and I analyze it. After getting necessary informations I suggest improvements to raise kvality of offered services, to curtailment time of realization and reduce costs.
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Analysis of thermal properties of the synchronous machine
Paszek, Michal ; Hájek, Vítězslav (referee) ; Janda, Marcel (advisor)
In this Master´s thesis will be performed an analysis of thermal properties of synchronous machines in the program Ansys Workbench on a simplified model of synchronous traction motor. In the first section will be performed thermal analysis without cooling followed by analysis of air flow and finally thermal analysis with cooling for fan speed 1500 min-1 and 3000 min-1. The second section will describe the principle, construction and losses on the synchronous machine. The third chapter will describe concepts such as heat, temperature, heat transfer, types of the heat transfer, specific heat capacity, emisivity and thermal conductivity. The fourth chapter will introduce the program Ansys Workbench, finite element method and Ansys CFX. In the fifth chapter will be described how to perform thermal analysis on the created model of motor. The sixth chapter will describe how to analyze the air flow of the created model of motor. The flow analysis will be performed for fan speed 1500 min-1 and 3000 min-1. In the seventh chapter will be compared the results of the air flow and pressure field in the motor model. In the eighth chapter will be performed a thermal analyzis on the created motor model with cooling for fan speed 1500 min-1 and 3000 min-1. The nineth chapter will compare the results of temperatures and heat fluxes obtained from the thermal analysis witnout cooling, with cooling for fan speed 1500 min-1 and 3000 min-1 for full losses, half losses of continous running, and full losses of interrupt running for 9000 seconds (2 hours 30 minutes).
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Simulation of electric field in the area of switchgear busbars
Müller, Michal ; Janda, Marcel (referee) ; Bušov, Bohuslav (advisor)
The aim of this work is to simulate the electric field in the space of busbar HV switchgear. More precisely, the aim is to find a place with the most critical value of the electric field, the design of measures to reduce the size of the field at this point. The simulation was performed using the finite element method program. The simulation found the most critical area. Using the basic physical principles it has been proposed solution. This solution reduced twice the magnitude the electric field in this area.
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Specifications of the Ansys Fluent Solution Solver for low pressures in EREM
Šimík, Marcel ; Bílek, Michal (referee) ; Maxa, Jiří (advisor)
This thesis is focused on electron microscopy which issue is discussed at the beginning of work. The main attention is dedicated to the Environmental electron microscope, especially the differentially pumped chamber, which the thesis deals with. There is a production of an experimental chamber for analysis of shock waves on going therefore main goal of this thesis was to analyze the flow pattern in this chamber. Using the Ansys Fluent program, simulations of the characteristic flow that arises from the pumping of the vacuum chambers namely the ultrasonic flow at low pressures on which the most suitable turbulent module was applied as well as the degree of discretization was performed. The final analysis of this flow pattern is primarily focused on the localization of the shock wave which experimental evidence is to be lodged by shadow optical method as a part of the new concept of the chamber. The basis for the simulation of the chamber was taken over by Dr. Danilatos, with which the results were compared.
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Identities in Tunelled Networks and during Network Address Translation
Šeptun, Michal ; Marek, Marcel (referee) ; Polčák, Libor (advisor)
This thesis introduces the design and implementation of the extension of the system for lawful interception. The system is developed as a part of the Sec6Net project at FIT BUT and provides a platform for research activities in determining identities in computer networks. Parts which has the task of monitoring changes in a user's identity will be extended, so that the system is able to determine the identity even in the tunneled and translated networks. It describes the problems encountered during implementation and their solutions. There are described mechanisms for tunneling networks, mainly virtual private networks and transition mechanisms for IPv6, IP addresses and NAT variants. In the end the tests of the individual modules are described.
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Comparison of Shadow Methods
Kiss, Marcel ; Milet, Tomáš (referee) ; Tóth, Michal (advisor)
This thesis talks about comparison of shadow casting techniques within a scene. In the theoretical part, it describes and compares possible solutions of shadow casting and more detailed about Shadow Mapping and Shadow Volumes, which are among the most commonly used real-time shadowing techniques. The main part is about design and implementation of these two shadow methods using the OpenGL library. In the measurement part it compares methods based on measured values. The outcome of my measurements can be found in the final part of my thesis.
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