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.NET's LINQ Optimization
Šerý, Daniel ; Ryšavý, Ondřej (referee) ; Pluskal, Jan (advisor)
This thesis deals with LINQ (Language integrated query) and investigates possibilities of its implementation and optimization in C# language. Method of rewriting of query to procedural code is chosen and implemented. The goal is to provide a LINQ that can be used in code with the need for high speed. Regarding the program created for rewriting LINQ queries, the performance of most operators has been increased by 1.2x to 20x of System.Linq speed depending of rewritten algorithm, data source and provided information to rewriting program.
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Fenomen deepfakes as a threat for journalism
Mudrová, Nikol ; Láb, Filip (advisor) ; Moravec, Václav (referee)
This Bachelor's thesis tackles the newly occurring type of fake news - deepfake videos. Considering they are quite new and not profusely misused to spread disinformation yet, the thesis embraces this phenomenon right from its roots. In the first section, it defines, what disinformation is, what did it emerge from, how did it look like in the past and how does it look like now. Obviously, to the topic also applies its psychological perspective - in this case, why people's brain does not identify fake news and which short-cuts in processing information take disinformators an advantage from. After such an introduction to the problematics follows a part, which explains the technology behind producing deepfake videos. In a practical part of the thesis concrete deepfake examples are analyzed. Based on this analysis and an interview with Jakub Zelenka, a journalist focusing on fake news, the thesis answers a question of whether and how deepfake videos influence journalism.
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Person Identification
Svědiroh, Stanislav ; Honec, Peter (referee) ; Richter, Miloslav (advisor)
This thesis focuses on the person identification based on faces. The aim is to create a working solution of person identification for the authentication purposes utilizing the Microsoft Kinect v2 sensor. It contains a summary of the most used algorithms for facial data description and their comparison. Thesis also proposes a PC program that controls the sensor and collects the facial data, saves them, manages keypoint detection and their comparison.
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Solving methods for bilevel optimization problems
Lžičař, Jiří ; Kopa, Miloš (advisor) ; Branda, Martin (referee)
The presented thesis discusses bilevel programming problems with the focus on solution algorithms. Bilevel programming problem is a hierarchical programming problem, where constraints contain another programming problem. We formulate basic bilevel optimization theory and describe three types of so- lution algorithms for bilevel programming problems: Algorithms based on KKT reformulation where the lower level is replaced by its KKT conditions, algorithms based on optimal value function where the bilevel programming problem is re- duced to a single level problem using the optimal value function of the lower level problem, and algorithms solving linear bilevel programming problems. Using real data for portfolio optimization bilevel programming problems, we compare ability to solve the problems and computing time of some of the pre- sented algorithms. 1
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Alternative economies in rural Russia
Vargolskaia, Virginia ; Stöckelová, Tereza (advisor) ; Abu Ghosh, Yasar (referee)
The aim of this diploma thesis is to study how nonhuman agents are introduced and employed as a replacement for social reproduction by analyzing the environment and types of exchange practiced in the countryside of post-socialist Russia. The farm where my fieldwork took place exhibits many types of exchange, among which cryptocurrencies, seen as a socio- material algorithm, are used for the redistribution of essential goods and/or favors in a method similar to those used in former socialist and post-socialist economies. Drawing from the anthropological discussion on gift-commodity logic in the area, I look at cryptocurrencies as a hybrid - they hold the qualities of a gift (authority, name) and could be used to speculate with on the crypto stock-exchange (commodity). Key words: alternative economies, post-socialism, cryptocurrencies, algorithms, sociomateriality
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Line search in descent methods
Moravová, Adéla ; Tichý, Petr (advisor) ; Vlasák, Miloslav (referee)
In this thesis, we deal with descent methods for functional minimalization. We discuss three conditions for the choice of the step length (Armijo, Goldstein, and Wolfe condition) and four descent methods (The steepest descent method, Newton's method, Quasi-Newton's method BFGS and the conjugate gradient method). We discuss their convergence properties and their advantages and dis- advantages. Finally, we test these methods numerically in the GNU Octave pro- gramming system on three different functions with different number of variables. 1
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Algorithms for Automatic Image Cropping
Ambrož, Vít ; Brejcha, Jan (referee) ; Čadík, Martin (advisor)
The main goal of this bachelor thesis is study and implementation of methods that can automatically crop images, so the result has good usability from a photographic view. In this thesis are made experiments with three methods and possible optimalizations are discussed. The properties of cropping algorithms are also described here and the evaluation of implemented algoritmhs is made according to user testing.
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Navigation in Public Transport
Turic, Matúš ; Křivka, Zbyněk (referee) ; Burget, Radek (advisor)
This master's thesis deals with the issue of traveling in public transport. In the first part the author informs about similar applications and theories necessary for understanding the problems. In the second part, the author describes the design and behavior of the mobile and server application, including the used technologies. Created mobile application has the task of navigating the user from one point to another in the shortest possible time, while it should be possible to replace the current route with faster one.
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Historical development of numerical methods and computational techniques, from the perspective of mathematics education in elementary school.
DIVÍŠKOVÁ, Michaela
In my diploma thesis I deal with historical numerical procedures and their application in teaching. In a total of eight chapters, I describe counting techniques from history, such as magic squares, interesting counting algorithms, unconventional divisibility criteria, ancient numeration techniques, golden ratio, figurate numbers, and graphic papers. I deal with the use of historical numerical methods in teaching in the final chapter. This chapter contains eight worksheets and activity suggestions with methodical commentary.
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