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Eluding and Evasion of IDS Systems
Černý, Marek ; Tobola, Jiří (referee) ; Žádník, Martin (advisor)
This paper analyzes network security devices called intrusion detection (ID) systems. In order to point out possible flaws, especially ID systems using signature analysis are examined. Based on this, methods to exploit possible vulnerabilities of these systems were designed. These methods were implemented into a simple program for ID systems efficiency evaluation. It can be used in a way entirely independent of particular network attack used in the test.
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Magnetic spin ice states in artificial magnetic frustrated systems
Schánilec, Vojtěch ; Hrabec, Aleš (referee) ; Rougemaille, Nicolas (advisor)
Uměle vytvořené systémy spinového ledu jsou vhodným nástrojem pro zkoumání neobvyklých jevů, které se v přírodě dají jen těžko pozorovat. Speciálním případem umělého spinového ledu je kagome mřížka, která umožňuje zkoumat kolektivní chování spinů v látce. Tento systém má řadu předpovězených exotických magnetických fází, které zatím nebyly změřeny a prozkoumány v reálném prostoru. V rámci této práce se zabýváme úpravou kagome mřížky tak, aby mohla být využita ke zkoumání exotických stavů v reálném prostoru. Experimenty provedené na naší upravené mřížce ukazují, že jsme schopni detekovat nízko i vysoko energiové stavy, a tedy, že námi navržená úprava kagome mřížky je vhodná pro zkoumání exotických stavů v reálném prostoru.
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A Tool for Analyzing Performance of Memory Allocators in Linux
Müller, Petr ; Peringer, Petr (referee) ; Vojnar, Tomáš (advisor)
This diploma thesis presents a tool for dynamic memory allocator analysis, focused on their performance. The work identifies the important memory allocator performance metrics, as well as the environment and program factors influencing these metrics. Using this knowledge, a tool was designed and implemented. This tool allows to gather and analyze these metrics. The tool provides the ability to create memory allocator usage scenarios for the purpose of the allocator behavior analysis under different conditions. The tool was tested on several available memory allocators with free license.
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Advanced Tools for Performance Measurement
Smrček, Jaromír ; Gajda, Zbyšek (referee) ; Kašpárek, Tomáš (advisor)
This thesis presents the I/O layer of Linux kernel and shows various tools for tuning and optimization of its performance. Many tools are presented and their usage and outputs are studied. The thesis then focuses on the means of combining such tools to create more applicable methodology of system analysis and monitoring. The practical part consists of applying SystemTap scripts for blktrace subsystem and creating a fragmentation monitoring tool with graphical output.
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Connecting SD Memory Card to Microcontroller
Laurinc, Pavel ; Kubek, Ján (referee) ; Škarvada, Jaroslav (advisor)
Author concerns with SD memory cards and microcontroller Atmel ATmega128. He describes their architecture, features, properties and technology used in devices. He is mentioning principle of communication protocols used by SD card, through that cards can communicate with other connected devices. He analyzes the functionality of FAT file system. He describes the design and implementation of interfaces to connect the SD cards to microcontroller. He explains software solutions of this project and gives impartial view to usage and comparisons of implemented modes of communication witch card.
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Baths +
Svoboda, Marek ; Foretník, Jan (referee) ; Kristek, Jan (advisor)
Spas are designed on the principle of stage and auditorium, where the visitor becomes either actor or observer; actor or spectator. Fragmenting each "act" active activities through a carefully programmed observation sites and vistas is needed to create tension between actor and observer. "Story" is is revealed gradually, and his understanding is necessary to move the proposed space and rotate each "Auditorium". Achieve a comprehensive sensation viewer is associated with the need to crawl space spa. Act is repeated. From the viewer becomes an actor and the actor spectator. The body is in motion and mental marches are a reflection of observation of physical events. (google translator)
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To Run Insurgency like a Business: Self-Defeating Patronage by the Principal in Eastern Ukraine
Laryš, Martin ; Aslan, Emil (advisor) ; Svoboda, Karel (referee) ; Mareš, Miroslav (referee)
The dissertation draws on the literature on indirect warfare based on principal-agent theory, which conceptualizes indirect warfare as an example of delegation. Principals play an important role in shaping the rebellion and exerting control over it through the delegation used as a low- cost and deniable device for empowering the rebel proxies. However, the delegation is fraught with problems, especially when delegated to fragmented rebels. The literature considers the fragmented rebel militias as weak non-state actors prone to rapid failure and decay. My argument focuses on the paradox of delegation to the fragmented rebel groups. I claim that such delegation is inherently costly and visible, which contradicts the original intention of delegation as a low-cost and deniable foreign policy tool. In my dissertation, I introduce the concepts of self-defeating patronage and decentralized delegation as my contribution to the discussion on indirect warfare. The principal suffers self-defeating patronage because it must keep the barriers-of-entry low for the incipient rebel groups to overcome the collective action problem that the would-be rebels experience due to their weak social ties. Keeping the barriers low without strict control by the principal - that would raise the costs and visibility - fuels...
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Qualitative analysis of selected glycosphingolipids subclasses isolated from human blood plasma using HILIC-ESI-MS/MS
ŠIKLOVÁ, Michaela
This bachelor thesis deals with the qualitative analysis of selected subclasses of glycosphingolipids isolated from human blood plasma using hydrophilic interaction liquid chromatography coupled with electrospray ionization tandem mass spectrometry (HILIC-ESI-MS/MS). Glycosphingolipids are ubiquitous and structurally very diverse components of cell membranes involved in many cellular functions. It has been shown that changes in the structures of glycosphingolipids and their distinct expression can pose a key factor in the development of numerous diseases and different types of cancer.The theoretical part of this thesis is dedicated to a summary of fundamental knowledge about glycosphingolipids, their biosynthesis, classification, biological functions and their association with various types of diseases and cancers. Furthermore, methods of isolation, purification and analytical possibilities for the determination of glycosphingolipids in biological samples are described here.In the experimental part, blood samples were taken and processed together with the preparation of the necessary solutions, plasma samples, and standards. Moreover, a test analysis, optimization of mobile phase gradient and comparison of the most frequently used extraction methods according to Folch, Bligh and Dyer, Matyash, and Alshehry alongside fractionation of lipid extract is described in this part. An integral part of the experimental section was the identification and structural characterization of glycosphingolipids within selected subclasses, including the generation of GSL profiles in human blood plasma. In conclusion, the results of the work and answers to the stated research questions are summarized, including the evaluation of possible improvements in this field.
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Quantification of main solution components by using fragments containing heavy nuclides of common elements
Horká, Blanka ; Čabala, Radomír (advisor) ; Bajer, Tomáš (referee)
Quantification of major components by gas chromatography with flame-ionization detector (GC-FID) is established in routine laboratory practice. The FID detector is considered as universal detector for gas chromatography (GC), but it does not provide a response for a wide range of compounds and GC-FID analysis provides only quantitative data. The coupling of gas chromatography with mass spectrometry is a powerful analytical tool that provides not only quantitative data but also qualitative data on the structure of substances. When quantified by GC-MS, the detector oversaturation is a problem as it is a highly sensitive detector (at ppb level). One way to avoid oversaturation of the detector is to significantly dilute the solutions, which causes a decrease in the sensitivity of the method. Another approach to bypass detector saturation is to interrupt detection during solvent elution. For quantification of the major components of solutions, only the first method of bypassing detector saturation can be applied, but it is a labor-intensive process that increases the measurement uncertainty. The interruption of detection during solvent elution is not applicable for the purpose of quantifying major components, so a new approach of quantifying major components of solutions using M+1 ions was proposed and...
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Wilderness and recreation in the Šumava NP - typology of the relationship
Zitová, Anna ; Romportl, Dušan (advisor) ; Matějček, Tomáš (referee)
The diploma thesis focuses on evaluating the relationship between wilderness and recreation, specifically in the Czech National Park Šumava. Šumava is one of the unique natural sites, not only due to its location in Central Europe, but also due to its unique natural wealth hidden in the heart of Europe. Moors, peat bogs, river springs, but also forest vegetation and much more are among the treasures of this Czech national park. These places are an attraction for many visitors. The work examines how to reconcile these two opposing tendencies. On the one hand, it is a desire to protect the natural environment and, on the other hand, it is the ever-increasing pressure of tourism and recreation. The diploma thesis is divided into two basic parts. The first part is a search of the evaluation of the "wilderness" itself and offers a view of this concept from different angles. It is evident that the view of the wilderness will be different in the world context from what we know from the Czech Republic. Furthermore, it is possible to get acquainted with the influence of recreation on the natural environment, resp. "Wilderness". The work examines the effects of recreation on fauna and flora in the most detail. The practical part of the work addresses the relationship between recreation and "wilderness" in...
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