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Temperature-induced restructuring of Pt-Cu bimetallic alloy catalyst for fuel cell applications
Kučera, Jan ; Khalakhan, Ivan (advisor) ; Vorochta, Michael (referee)
Fuel cells appear as a promising technology, enabling the replacement of internal combustion engines in the automotive industry. Hydrogen fuel cells with a polymer membrane are particularly suitable for this application. Despite significant progress, this technology suffers from several drawbacks that hinder its widespread adoption. One of the main issues is the need for expensive platinum as a catalyst. A possible way to save costs is by using bimetallic catalysts based on platinum and inexpensive 3d transition metals like copper. The preparation of these catalysts can, for instance, leverage the phenomenon of thermally induced segregation. A deeper understanding of platinum segregation in bimetallic PtCu layers could contribute to the development of a better and more cost-effective catalyst. This study examined thin PtCu layers prepared using magnetron sputtering. Their structure, chemical composition, and morphology were determined, and platinum segregation was monitored by X-ray photoelectron spectroscopy, depending on the annealing temperature of the samples.
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Song lyrics by Jaromír Nohavica in the aspect of dialectology
KUČERA, Jan
The main content of this bachelor thesis is a dialectical analysis of a part of Jaromír Nohavica´s work to describe the influence of the Silesian dialect in his lyrics. The thesis is introduced with a summary of Nohavica´s life and work, followed by the theoretical part consisting of a description of Silesian dialectical features. The practical part contains tables with dialectical occurrences in all linguistic levels, their characterization and analysis supported by examples.
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User Interface for DDoS Mitigation Configuration
Man, Jakub ; Kekely, Lukáš (referee) ; Kučera, Jan (advisor)
Denial of service (DoS) (česky odepření služby) je častý typ útoku na internetové zařízení a sítě. Za účelem mitigace těchto útoků bylo vyvinuto síťové zařízení ,,DDoS Protector''. Konfigurace tohoto zařízení však může být komplikovaná a pro efektivní funkci vyžaduje konfiguraci uživateli, kteří se dobře orientují v problematice DoS útoků. Tato práce se zaměřuje na zjednodušení konfigurace tohoto zařízení pomocí uživatelského rozhraní. Bude vyvinuto webové uživatelské rozhraní a aplikační rozhraní. Uživatelské rozhraní umožní i méně znalým uživatelům efektivně konfigurovat DDoS Protector. Aplikační rozhraní umožní dalším vývojářům integrovat konfiguraci tohoto zařízení do dalších aplikací.
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Accelerating an Application for DDoS Mitigation
Vojanec, Kamil ; Kekely, Lukáš (referee) ; Kučera, Jan (advisor)
This thesis focuses on optimizing and accelerating an application used for mitigating Denial of Service attacks. The goal is to analyze the existing implementation of DDoS Protector and to identify components which are suitable for optimization or hardware acceleration. Based on the analysis, improved algorithms and data structures utilizing the DPDK open-source framework are designed together with a proposal to offload certain computation elements into hardware using the RTE Flow library. The result of this thesis is a set of modules and an implementation of classification components intended to be used within the DDoS Protector application. The resulting components are then properly tested. Finally, the performance results of the original and new implementations are compared. The application shows as much as five-times improvement in terms of packet rate when using 256 classification rules.
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Acceleration of Open vSwitch in DPDK
Vodák, David ; Kučera, Jan (referee) ; Martínek, Tomáš (advisor)
Virtual switch is a software that connects virtual machines to the internet, which makes it a crucial part of virtualization on servers. Nevertheless, it can be rather ineffective when it comes to high speed traffic, since it switches all frames in the software. This thesis is about hardware acceleration of the virtual switch called Open vSwitch. The acceleration prototype, which is the goal of this thesis, is based on the RTE flow interface, the SR-IOV standard, and Intel PAC N3000 card. In the scope of this master's thesis, all necessary technologies were described and the acceleration prototype was designed, implemented, and tested. Results of executed measurements indicate increased throughput when rules of the acceleration prototype were offloaded to hardware.
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Framework for Graphical User Interface Testing
Báča, Erik ; Kučera, Jan (referee) ; Kocnová, Jitka (advisor)
This thesis is describing the development of a framework for graphic user interface testing with usage of Soft Computing algorithms. Development is divided into four phases. The first phase is acquaintance with existing GUI testing frameworks and their analysis. The second phase is about choosing appropriate technologies for development, appropriate algorithms and implementation design. Then there is the framework implementation phase itself and last phase with the testing, result evaluation and improvements proposal.
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Eye Tracking Based Gaming Combat System
Kučera, Ján ; Kapinus, Michal (referee) ; Chlubna, Tomáš (advisor)
Aim of this thesis is to create a 3D fighting game in which, a player is able to aim via their eye gaze. Eyes are tracked using special glasses Pupil Core, that track players eye gaze using infrared camera. The game itself is implemented in a game engine Unity and communication between game and glasses is implemented via local server. The result is a 3D fighting game with an aiming mechanic using eye gaze.
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Transparent polycrystalline ceramic materials with cubic lattice structure
Kučera, Jan ; Pouchlý, Václav (referee) ; Maca, Karel (advisor)
The presented work is focused on the study of the influence of preparation parameters on the optical properties of polycrystalline cubic ZrO2 (stabilized with 8 mol.% Y2O3). Furthermore, the work deals with the doping of c-ZrO2 with TiO2 and its effect on the luminescence properties of ZrO2. The examined samples were prepared by uniaxial pressing (10 MPa), followed by a cold isostatic pressing (300 and 700 MPa), pressureless sintering (1340–1380 °C, 10 min), and hot isostatic pressing (1200–1400 °C, 4 h, 200 MPa). In this work, it is shown that the optical properties are significantly affected by the temperature of the hot isostatic pressing, the thickness of the sample, and also by the wavelength of the incident light. A maximum real in-line transmission of 68.8 % was achieved, which is 90.5 % of the theoretical limit for c-ZrO2 at an incident radiation wavelength of 632.8 nm. A low-pressure infiltration method and a powder mixing method were used to prepare the doped ZrO2 ceramic sample. With doping, the maximum of the excitation spectrum shifted from 295 nm (4.20 eV) for the undoped ZrO2 to 320 nm (3.87 eV) for the doped samples. Doping led to an increase in emission intensity compared to a pure ZrO2 by up to 23 times. The maximum emission intensity at 545 nm wavelength was achieved for samples doped by infiltration method with a nominal 0.1 mol.% TiO2 content.
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Just War Theory and Humanitarian Intervention: Case of Kosovo
Šolc, Martin ; Kučera, Jan (advisor) ; Střítecký, Vít (referee)
The aim of the bachelor thesis is to assess the NATO military intervention in Kosovo from the spring 1999 in terms of international law and - first of all - the western just war theory. The thesis first focuses on the genesis of just war theory in the political philosophy of european Antiquity, Middle Ages and early Modern Age, which provides better understanding of the meaning of certain conditions which are necessary to fulfill in order to use force legitimately. The thesis further comes to conclusion that humanitarian intervention forms a legitimate part of contemporary just war theory. The theoretical part of thesis ends with definition of necessary and auxiliary just war criteria applicable to humanitarian intervention; there is also described the regulation of the use of force in international law. The thesis then proceeds to proper case study. After the history of conflict is briefly addressed, international law norms and just war criteria are applied to the NATO military intervention. The thesis concludes that the intervention was illegal: the conditions set by the UN Charter were not met nor was there to be found any customary norm which would provide the action of Alliance with a legal basis. On the other hand, the intervention proved to be legitimate in terms of just war theory: all of...
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