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Characteristic of ESP written communication
Kučera, Ondřej ; Walek, Agata (referee) ; Baumgartnerová, Alena (advisor)
Cílem této bakalářské práce je definovat, co je to angličtina pro specifické účely, vymezit její styly a žánry. Tato práce je rozdělena do tří hlavních částí. V první části je stručně představen anglický jazyk pro specifické účely a jeho historie. Jsou zde přiblíženy styly tohoto jazyka a je vysvětleno jejich použití. Ve druhé části jsem definoval žánry tohoto jazyka, vysvětlil účel každého z nich a ukázal, jak se dále dělí. Ve třetí části jsou prezentovány části textů, jež jsou analyzovány a porovnány: dva texty z elektrotechniky a dva texty z medicíny. V obou oblastech je porovnáván úryvek z populárně vědeckého článku a učebnice. Analýza je provedena ve čtyřech kategoriích: koheze, deixe, signposting a hedge. Tyto výsledky jsou porovnány nejdříve ve stejném oboru mezi rozlišnými styly a následně mezi odlišnými obory – elektrotechnika a medicína. Všechny výsledky jsou komentovány.
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Processing and properties of piezo-dielectric ceramic composites
Kučera, Ondřej ; Drdlík, Daniel (referee) ; Maca, Karel (advisor)
The diploma thesis deals with piezoelectric materials combining dielectric and piezoelectric ceramics. The first part of this diploma thesis summarizes the preparation of ceramic materials and thermodynamic of sintering. The electric properties of ceramic materials and current knowledge in BCZT ceramics are summarized. The second part of this diploma thesis describes BCZT ceramics preparation process from raw materials in powder form through the reaction of the precursors to sintering the experimental material into the compact body. The properties of prepared BCZT samples such as density, grain size, hardness, relative permittivity, piezoelectric constant and dielectric loss are summarized in the thesis.
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Chord structure detection in music recordings
Kučera, Ondřej ; Miklánek, Štěpán (referee) ; Ištvánek, Matěj (advisor)
This thesis deals with music information retrieval, namely automatic chord recognition in audio recordings. The thesis defines the concepts of chord and chroma features and describes the methods of converting the signal from the time domain to the frequency domain. The thesis explores methods for automatic chord detection; the state-of-the-art methods are based on deep learning. The thesis includes a system implemented in Python that allows chord detection from audio recordings. Individual recordings and associated chord labels can be visualized. The system offers a choice of methods for chord recognition – a method based on chord templates, a method using deep chroma vectors, and a method based on a convolutional neural network. The results of the methods are evaluated on a multi-genre dataset compiled from freely available annotations and recordings.
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Impact of joint implant surface structure on friction behaviour
Kučera, Ondřej ; Nečas, David (referee) ; Ranuša, Matúš (advisor)
In osteoarthritis of small joints, the use of total endoprosthesis is currently being developed to ensure physiological movement, but it provides only a limited-service life. The use of microstructures on the implant surface may improve tribological properties, but this issue is not described enough. Thus, this work addresses the impact of microstructures on friction coefficient, lubricant thickness in the contact area, wear, as well as surface topography and geometry of the structures. Furthermore, the influence of DLyte electrochemical machining on the change of microstructures geometry and tribological properties is investigated. Measurements were performed using a reciprocal tribometer, interferometry and optical profilometry. The textured samples achieved an increase in both friction coefficient and lubricant thickness in the contact area. Furthermore, a correlation between the height of the texture edges and the measured lubricant thickness was demonstrated. DLyte significantly reduces these edges, also reducing wear, however, it degrades the surface of the CoCrMo samples. Implant texturing can lead to reduced wear, prolonged life, and thus improved quality of life for many patients. Texturing of Ti6Al4V alloy in combination with DLyte shows great potential.
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Operation of electric vehicles, hybrid vehicles and vehicles with an internal combustion engine
Herzog, Radim ; Píštěk, Václav (referee) ; Kučera, Ondřej (advisor)
This bachelor's thesis deals with the comparison of different propulsion concepts and their consumption, efficiency, and amount of emissions produced during operation. Although electric vehicles do not produce any local emissions, it is necessary to consider that emissions are generated during the production of electricity in power plants. The main part of the thesis introduces the functional principles of individual propulsion systems. Furthermore, it describes the formation of exhaust gas emissions in combustion engines and outlines their limits. Subsequently, the amount of emissions produced by a power plant for the operation of a specific example of an electric vehicle and a hybrid vehicle is calculated. Finally, a comparison of emissions production from representative examples of each propulsion system is illustrated.
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The issue of domestic violence in the Český Krumlov region
KUČERA, Ondřej
The thesis deals with the readiness of Český Krumlov police officers to deal with domestic violence, i.e. their knowledge of concepts and police methodologies in the field of domestic violence, the institute of eviction and internal police tools. Furthermore, the availability and frequency of training to strengthen the expertise and sovereignity of police officers when responding to incidents of domestic violence. The theoretical part defines the phenomenon of domestic violence, namely its characteristic manifestations, its impact on the life situation of victims and the possibilities of assistance. It also explains the activities, central norms, internal acts and tools of the Police of the Czech Republic for dealing with cases of domestic violence. The practical part verifies and compares the findings with the results of A qualitative research survey conducted among police officers of the district departments of the Český Krumlov Police.
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Prague Dependency Treebank as a Czech grammar practice book Prague Dependency Treebank as an exercise book of Czech
Kučera, Ondřej ; Vidová Hladká, Barbora (advisor) ; Panevová, Jarmila (referee)
Prague Dependency Treebank (PDT) is one of the top language corpora in the world. The aim of this work is to introduce a software system that builds an exercise book of Czech using the data of PDT. Two kinds of exercises are provided: morphology (selecting correct parts of speech and their morphological cathegories) and sentence parsing (selecting analytical functions and dependencies between them). The PDT data cannot be used directly though, because of the differences between the academic approach in sentence parsing and the approach that is used in schools. Some of the sentences have to be discarded completely, several transformations have to be applied to the others in order to convert the original representation to the form to which the students are used to from school.
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Synthesis and study of 6-((7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)amino)hexanoic acid derivatives as transdermal permeation enhancers
Kučera, Ondřej ; Vávrová, Kateřina (advisor) ; Nováková, Veronika (referee)
Ondřej Kučera Charles University in Prague, Faculty of Pharmacy in Hradec Králové Synthesis and study of 6-((7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)amino)hexanoic acid derivatives as transdermal permeation enhancers Transdermal permeation enhancers are used to increase absorption of drugs through skin or, more importantly, through the stratum corneum, which is the uppermost layer of the skin. Mechanism of action of enhancers is not fully understood. In general the most active enhancers consist of hydrophilic and hydrophobic parts. In this work, we prepared and studied fluorescent permeation enhancers. Fluorescent dye NBD (7-nitrobenzo[c][1,2,5]oxadiazol) is fairly hydrophilic, so we used it as a hydrophilic head of potential enhancers based on dodecyl 6- (dimethylamino)hexanoate (DDAK). Such fluorescent enhancers could help us understand more about the mechanism of action. It enables determination of this enhancer and imaging of its penetration pathways in the skin. We synthesized three esters of 6-((7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)amino)-hexanoic acid (NBD-acid) with ester-linked C8-C12 alkyls. 6-Aminocaproic acid reacted with 4-chloro- NBD and then with a series of alcohols to give us different lengths of alkyl chains. We applied these enhancers to human skin in Franz diffusion cells using two...
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Four-cylinder in-line gasoline aircraft engine
Kučera, Ondřej ; Kučera, Pavel (referee) ; Píštěk, Václav (advisor)
The thesis deals with the structural design of a steel connecting rod for the aircraft engine Walter Mikron III, which is currently still manufactured and developed by company PARMA-TECHNIK, s.r.o. The proposed connecting rod would replace the current duralumin connecting rod. The work also contains a strength analysis of the designed component, in which it was aimed to verify the stress on the connecting rod, based on which the fatigue safety factor was performed. This is crucial for dynamically stressed parts of internal combustion engines. Furthermore, was investigated the effect of the change of the connecting rod on the torsional vibration of the crank mechanism. For this purpose, was built a discrete torsion model. The output of the whole work is the drawing documentation of the new connecting rod, meeting the requirements for application in an aircraft engine.
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Analysis of welded joints after fatigue tests
Kučera, Ondřej ; Doubrava, Marek (referee) ; Havlík, Petr (advisor)
This bachelor thesis deals with analysis of welded joints after fatigue tests . The first part of this thesis, literary research, discusses weldability of carbon steels and low-alloy steels and effect of chemical composition on weldability of materials. Further there are zones of welded joints, their microstructure and mechanisms applied described in this thesis. There are defects occurring in welded joints and their common causes and remedies described in the part of literary research dealing with defects. And the final part of the literary research deals with material fatigue, fatigue of welded joints and effect of defects, fusion zone and heat-affected zone on the fatigue of welded joints. In the experimetal part of bachelor thesis there is described experimental material, results obtain process and discussion of results.
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