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Implementation of the virtual voice assistant
Dvořák, Petr ; Koch, Miloš (referee) ; Novák, Lukáš (advisor)
This diploma thesis focuses on the analysis of the current voice system (IVR) and subsequently the selection and implementation of a virtual voice assistant into the company's environment. The thesis includes theoretical foundations, company analysis, and a detailed description of the implementation process.
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Implementation of the infrastructure for microphone audio streaming into the cloud
Dvořák, Petr ; Smékal, Zdeněk (referee) ; Zvončák, Vojtěch (advisor)
The task of this bachelor's thesis is creation of simple and functional infrastructure designated for recording and transmission of an audio recording captured by microphone and processed by Raspberry Pi. Final output file is then transfered to cloud storage. The goal of the thesis is making a prototype capable of processing a sound recording into required format and with suitable quality. The work should consider possibility of charging the system with battery, type of used network technology and setup of the cloud storage. Prototype should be simple and functional. Importance is comparing the infrastructure with similar devices on the market.
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Preparation and characterization of plasmonic graphene-copper nanostructures
Robešová, Magdaléna ; Pavelec,, Jiří (referee) ; Dvořák, Petr (advisor)
This diploma thesis deals with the study and preparation of graphene-copper nanostructures, which represent a new path in the research of plasmonic metasurfaces. This combination of copper with the unique properties of graphene could bring advancements in the quest for reliable copper plasmonic nanostructures. Alongside a literature review of previous scientific progress in this field, the nanostructures have been prepared using focused ion beam (FIB) and chemical vapor deposition (CVD) methods. Subsequently, the fabrication process underwent quality evaluation, and optical characterization was performed.
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Near-field excited photoluminescence mapping
Klok, Pavel ; Ledinský, Martin (referee) ; Dvořák, Petr (advisor)
Tato práce se zabývá mapováním fotoluminiscence (PL) pomocí buzení blízkého pole (NF), které slouží ke zkoumání optoelektronických vlastností v nanometrovém měřítku. Díky překonání omezení tradičních optických technik v dalekém poli zkoumá jevy na menších rozměrech, které by jinak byly nedostupné. Hlavní důraz je kladen na NF rastrovací optickou mikroskopii, která umožňuje pozorování poddifrakčních jevů u studovaných vzorků. Významným přínosem této práce je zavedení časově rozlišitelného mapování PL v NF, tedy průlomové metody pro studium dynamických procesů pod hranicí difrakce. Tento přístup představuje nový přínos pro tento obor, což potvrzuje i přehled literatury uvedený v této práci. Díky pečlivému vyhodnocení a interpretaci měření PL tato práce rozšiřuje naše znalosti o optických vlastnostech olovnatých halogenidových perovskitů a jejich potenciálních aplikacích např. pro solární články. Dále odhaluje dosud neprozkoumané možnosti v oblasti časově rozlišitelného mapování PL v NF a poskytuje dosud nevídaný náhled do dynamických procesů pod difrakčním limitem. Posunutím hranic optického výzkumu na úrovni nanorozměrů vytváří tato diplomová práce základ pro nové směry zkoumání v této oblasti.
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Deeper properties of conics in the projective plane
Dvořák, Pavel ; Krump, Lukáš (advisor) ; Hromadová, Jana (referee)
The bachelor thesis presents alternative constructions and procedures in order to deepen the understanding of conic sections. Several types of procedures were used while solving certain problems, all of which led to the same result. Thesis also includes a more complicated construction of a conic section that does not lead to a unique solution. The main outcome of this thesis is reminiscent of the basic projective geometry course with an extended focus on conic sections. 1
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Vnější hydraulické okruhy traktorů
Dvořák, Petr
The purpose of this bachelor thesis is to acquaint the reader with the external hydraulic cir-cuits of tractors. The bachelor thesis is divided into three parts. First part briefly summariz-es development of hydrostatic circuits in tractors. Second part is focused on functional and control elements of external hydraulic circuits. Furthermore, the electrohydraulic control system and the Load sensing system are described here. The final part of the bachelor thesis deals with possibilities of tractor hydraulic system diagnostics with the help of its external hydraulic circuit.
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Dynamics of hydrogen bonded networks viewed by NMR spectroscopy
Dvořák, Petr ; Lang, Jan (advisor) ; Hanyková, Lenka (referee) ; Hritz, Jozef (referee)
Title: Dynamics of hydrogen bonded networks viewed by NMR spectroscopy Author: Petr Dvořák Department: Department of Low Temperature Physics Supervisor: doc. RNDr. Jan Lang, Ph.D., Department of Low Temperature Physics Abstract: This work describes especially experimental studies of dynamic processes in common polar solvents such as water and ethanol. The nuclear magnetic reso- nance (NMR) technique was used - primarily measurements of NMR relaxa- tions and measurements of self-diffusion coefficients using NMR. Three main topics were addressed. The first one deals with chemical exchange in mixtures of light and heavy water. Within this topic, a methodology for the preparation of ultra-pure samples was developed and a suitable method for suppressing radiation damping was proposed. Then the final samples were prepared, and the relaxation data were measured. Three models of chemical exchange were discussed. The second topic deals with correction of the Stokes-Einstein rela- tion so that it can also be used for determination hydrodynamic radii of small molecules and clusters. This correction was made by comparing the measured diffusion coefficients of the model molecules with the calculated diffusion coef- ficients using hydrodynamic simulations. The third topic deals with the relax- ivity of magnetic...
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Diversity of microalgae from extreme habitats: linking phylogeny and ecology
Barcyte, Dovile ; Nedbalová, Linda (advisor) ; Dvořák, Petr (referee) ; Bock, Christina (referee)
The diversity of microalgae from extreme habitats is far from being fully explored and understood. This is due, in part, to limited sampling efforts along with complex algal taxonomy and systematics. In particular, little investigated extremely acidic (pH < 3.0) and polar habitats might veil novel, undescribed species. This doctoral thesis aimed to study algal strains isolated from acidic or acidic and hot, and cold environments using a polyphasic approach. It focused on coccoid (Coccomyxa and Watanabea), monadoid (Chloromonas and its relatives) and saccoderm (Cylindrocystis) green microalgae from the classes Trebouxiophyceae, Chlorophyceae, and Zygnematophyceae, respectively. In addition, coccoid red algae (Galdieria) from the class Cyanidiophyceae were covered. The main research methods included light and transmission electron microscopy combined with Sanger sequencing. Nuclear 18S rDNA and plastid rbcL sequences were used for construction of phylogenetic trees for taxonomic position evaluation. Comparisons of secondary structure models of the highly variable ITS2 rDNA molecular marker served for a more detailed genetic relationship estimation among close relatives. Results have shown that Coccomyxa and Watanabea are present in extremely acidic lakes and that acidity and increased availability of...
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Limits of Data Structures, Communication, and Cards
Dvořák, Pavel ; Koucký, Michal (advisor) ; Hansen, Kristoffer Arnsfelt (referee) ; Chakrabarti, Amit (referee)
Limits of Data Structures, Communication, and Cards - Abstract In this thesis, we study several aspects of computational complexity. One of the main topics is the complexity of data structures, which are algorithms for efficient storing data supporting efficient queries to the data. In the case of dynamic data structures, they also allow modification of the data before querying. A long-standing open problem in this area is to prove an unconditional polynomial lower bound of the trade-off between the update time and the query time of an adaptive dynamic data structure computing some explicit function. We provide an unconditional polynomial lower bound for a restricted class of semi-adaptive dynamic data structures computing functions of large corruption bound, that generalizes the result by Ko and Weinstein [FOCS '20] who provided such a lower bound for data structures computing the Disjointness function. Further, we provide conditional lower bounds for certain static data structures computing permutation inversion, and polynomial evaluation and inversion. These lower bounds beat the best-known unconditional lower bounds for the problems of interest. Further, we study the communication complexity of the elimination problem, which is a prob- lem closely related to the direct sum. In the elimination problem, Alice...
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