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Homomorphic encryption and coding theory
Půlpánová, Veronika ; Hojsík, Michal (advisor) ; Šťovíček, Jan (referee)
Title: Homomorphic encryption and coding theory Author: Veronika Půlpánová Department: Department of algebra Supervisor: RNDr. Michal Hojsík, Ph.D., Department of algebra Abstract: The current mainstream in fully homomorphic encryption is the appro- ach that uses the theory of lattices. The thesis explores alternative approaches to homomorphic encryption. First we present a code-based homomorphic encrypti- on scheme by Armknecht et. al. and study its properties. Then we describe the family of cryptosystems commonly known as Polly Cracker and identify its pro- blematic aspects. The main contribution of this thesis is the design of a new fully homomorphic symmetric encryption scheme based on Polly Cracker. It proposes a new approach to overcoming the complexity of the simple Polly Cracker - based cryptosystems. It uses Gröbner bases to generate zero-dimensional ideals of po- lynomial rings over finite fields whose factor rings are then used as the rings of ciphertexts. Gröbner bases equip these rings with a multiplicative structure that is easily algorithmized, thus providing an environment for a fully homomorphic cryptosystem. Keywords: Fully homomorphic encryption, Polly Cracker, coding theory, zero- dimensional ideals
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Automatic Extraction of Lexico-Syntactic Information from Corpora
Bojar, Ondřej
The presented work investigates methods for semi-automatic extraction of lexico-syntactic information from corpora, particularly the information on subcategorization and valency frames. We document that at present time, PDT and CNC corpora are not sufficient for this task. We describe a simple method for a selective extension of corpora based on texts from Internet. We evaluate three parsers available for Czech with respect to the task of extracting verb frames. We have implemented a linguistically motivated ltration of input sentences to identify "very simple sentences", which helps the parsers to achieve better accuracy. The system AX designed in this work is more generic, any kind of linguistic fi ltration can be employed. The system is also suitable for creating partial or full parsers of natural languages. The thesis also presents a user's guide to the system AX. Furthermore, we compare methods for extraction of subcategorization frames from observed frames. We classify observed frames into a hierarchy suitable for human anotators. Finally, several problems of automatic extraction of valency frames are discussed.
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Analysis of job satisfaction of employees
Procházka, Lukáš ; Stříteský, Marek (advisor) ; Šikýř, Martin (referee)
This thesis examines the problem of job satisfaction. It explains basic concepts and methods of most widely used theories of job satisfaction. The work contains survey on job satisfaction on a specific market entity - the company Telefónica Czech Republic, a.s., the findings of current situation and it proposes alternative procedures to improve the situation. Data collection was performed using a questionnaire submitted by employees of the company Telefónica Czech Republic, a. s. On the basis of personal evaluation questionnaire was then conducted the analysis of job satisfaction. The aim of this work is to analyze external factors affecting job satisfaction.
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The most frequent injuries in orienteering, diagnostics, treatment and prevention of them
Kovářová, Kristýna ; Stackeová, Daniela (referee) ; Pavlů, Dagmar (advisor)
Kovářová, K.: The most frequent injuries in orienteering, diagnostics, treatment and prevention of them. Background: One of the basic tasks for every athlete is preventing injuries and overuse, while achieving good results. However, there is no review paper, where injuries in orienteering are generally reviewed and widely discussed. Objectives: The aim of this work is to give a comprehensive overview of injuries in orienteering. At first, to compare the results obtained from the studies regarding injuries in orienteering and then to describe the injury patterns, diagnostic and therapeutic methods and procedures what can be used to prevent injuries described. Methods: Pedro databases, PubMed and the databases of the National Medical Library and Central Library FTVS UK were the sources of studies (in Czech and English language) on injuries in orienteering during the years 1980-2008 (keywords orienteering, injury). Ranking of the frequency of the injuries has been compiled. The injury patterns, basic diagnostic and therapeutic procedures, and methods which can be used to prevent these injuries are described in the following theoretical section . Results: In the overall rating (average percentages representation types of injuries from studies in which the type is directly described) ankle injury...
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Vliv stavu a funkce imunitního systému na pohlavní výběr u ptáků
Vinkler, Michal ; Albrecht, Tomáš (advisor) ; Kleven, Oddmund (referee) ; Grim, Tomáš (referee)
Evolution is a most fascinating feature of all living things in our world. The means of organismal evolution are diverse, comprising mainly of natural and sexual selection. Both of these phenomena may contribute to evolutionary adaptations in health and disease. The questions of immunity impact on the process of sexual selection and sexual selection for increased anti-parasite resistance are wide issues of the present research in natural sciences. Their clarification requires multidisciplinarily-based investigation combining a variety of partial results into a single united paradigm. My co-workers and I have chosen several specific issues to study, in order to fill some of the important gaps of the current knowledge. We proposed the Carotenoid maintenance handicap hypothesis to point out that optimisation instead of maximisation of the carotenoid intake and ornamental display may be physiologically convenient for the individual. In Scarlet rosefinch (Carpodacus erythrinus) we confirmed the role of the carotenoid-based ornamental colouration in the process of sexual selection and investigated several partial aspects of the association between immunogenetics, immune function, health and the ornament expression and mate choice. In Zebra finch (Taeniopygia guttata) we have shown that the present way of...
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Methodology and didactic of life saving on the open flat water.\\
PROCHÁZKOVÁ, Iva
This bachelor´s thesis is of a theoretical nature which is aimed for a training of the surface rescue. The objective of this thesis based on a world-wide observation is a detail description and photographic documentation of individual rescue techniques being used mostly abroad and are applicable to open slack waters in the Czech Republic.The text refers to the history, the development of world´s organozations, rescuers´ equipment and theoretical knowledge needed for the surface rescue training
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Study of Electrophysiological Function of the Heart in Experimental Cardiology
Ronzhina, Marina ; Tyšler, Milan (referee) ; Halámek, Josef (referee) ; Kolářová, Jana (advisor)
Srdeční poruchy, jejichž příkladem je ischemie myokardu, infarkt, hypertrofie levé komory a myokarditida, jsou v experimentální kardiologii obvykle studovány na modelu izolovaného srdce. Kritéria pro detekci srdečních poruch však nejsou pro zvířecí modely standardizována, což komplikuje srovnání a interpretaci výsledků různých experimentálních studií. Obzvlášť složitá situace nastává při současném výskytu několika patologických jevů, jejichž vzájemná součinnost komplikuje rozpoznání jejich individuálních účinků. Korektní posouzení stavu srdce vyžaduje také zohlednění mnoha faktorů spojených s akvizicí dat. Tato práce je věnována kvantitativnímu hodnocení elektrofyziologických změn způsobených globální ischemií myokardu. Vliv ischemie byl hodnocen pro fyziologická srdce a srdce se zvětšenou levou komorou a dále pro srdce nabarvená napěťově-citlivým barvivem di-4-ANEPPS. Přestože jsou oba fenomény často zastoupeny v animálních studiích, nebyl dosud popsán jejich vliv na manifestaci ischemie v elektrogramech (EG), ani nebyl kvantifikován jejich vliv na přesnost detekčních algoritmů pro identifikaci ischemie. Práce shrnuje kvantitativní změny srdeční funkce vyvolané ischemií (v normálních podmínkách, při hypertrofii levé komory, a při administraci barviva) založené na hodnocení EG a VKG parametrů. Dále práce obsahuje rozbor důležitých aspektů akvizice záznamů, jako je umístění snímacích elektrod, způsob výpočtu deskriptorů z EG a VKG (s použitím výsledků manuálního rozměření záznamů, nebo bez něj) a identifikace okamžiku vývoje ischemie v preparátu. Nedílnou součást práce tvoří návrh, realizace a ověření metod pro automatickou detekci ischemie v experimentálních záznamech. Výsledky práce dokazují, že dosažení opakovatelných a věrohodných výsledků je podmíněno zohledněním všech výše uvedených faktorů souvisejících jak se stavem srdce, tak s metodikou záznamu a analýzy dat.
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Human Capital and Investing into it in the Selected Company
Kosa, Kristina ; Šrédl, Karel (advisor) ; Hana, Hana (referee)
In this graduate work studied problems of human capital and investing in it. Currently, the concept of human capital is widely used. From all enterprise resources, especially in human capital contains the greatest scope for increasing the efficiency of the functioning of modern enterprise. Human capital is becoming the object of investing together with technical equipment, buildings, technologies. The theoretical part describes the basic concepts of human capital, basic viewpoints on human capital theory. The goal of this graduate work is the comparison points of view on the human capital theory and forecasts of market development of human capital in the Czech Republic and the Russian Federation. In the practical part analyzed investing behavior of the Russian group of companies Master in human capital.
The task of the practical part is to find out how the company trying to develop its human capital.
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Mass Spectrometry Imaging of Metformin in Tissue Sections
Strnad, Štěpán ; Sýkora, D. ; Vrkoslav, Vladimír ; Cvačka, Josef ; Maletínská, Lenka ; Pirník, Zdenko
Mass spectrometry imaging is a powerful technique suitable for visualization of the distribution of a wide variety of compounds within tissue sections. The main aim of the study was the development and optimization of a sample preparation procedure allowing determination of the distribution of orally dosed metformin in mice kidney sections. Metformin is the first-line medication for the treatment of type 2 diabetes. The optimization of the sample preparation step before imaging experiments included the selection of a suitable matrix and the optimization of various parameters of MALDI analysis. 2,5-dihydroxybenzoic acid was identified as the best matrix providing highest sensitivity. A sublimation method was successfully used for the matrix deposition. The highest relative concentration of metformin was found in the inner zone of kidney 30 minutes after the drug administration.
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Unfolding of energies of fusion products measured by the activation probe at JET
Ficker, Ondřej ; Mlynář, Jan ; Bonheure, G. ; Murari, A. ; Popovichev, S.
Providing a detection method for diagnostic of charged fusion products in tokamaks presents a major challenge, while its absolute calibration with a sufficient accuracy and its capability to withstand harsh fusion reactor environment will be required. A novel type of detector that meets most of these requirements, based on an activation probe, was tested in JET and other European facilities. This probe proved to be extremely robust due to its simple construction. It is equipped with samples of well defined isotopic abundance. The amounts of activated nuclei due to the reactions in these materials could be measured via ultra-low-level gamma spectroscopy. The feasibility of the proton spectrum reconstruction from measured activities is examined in this contribution with the help of the algorithm based on the Tikhonov regularisation constrained by minimum Fisher information. The reliability of the method was previously illustrated using synthetic proton data.
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