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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Simulace formování obrazu v elektronovém mikroskopu pomocí sledování elektronů
 Mikuš, Pavel ; Iser, Tomáš (advisor) ; Vorba, Jiří (referee)
Cryogenic electron microscopy (cryo-EM) is an evolving field allowing molecular visu- alizations with picometer resolutions. Images are acquired by shooting electrons through molecular samples and detecting the scattered electrons. From such data, 3D shapes of the molecules can be inversely reconstructed. Currently, describing and simulating the cryo-EM image formation is based either on naive transmittance models or complicated wave-function formalisms. In this thesis, we explore the possibility of simulating cryo-EM image formation via Monte Carlo electron tracing. We combine a delta-tracking algorithm with an elec- tron elastic differential cross-section function and Rutherford formulae to derive two Monte Carlo estimators. The derived models are implemented in a high-performance C++/CUDA environment and compared with other common models. Our particle-based simulated images show considerable similarity to the wave-based state-of-the-art multi- slice model. We also evaluate our models on class averages of real measurements. Both of our proposed models have significantly higher normalized cross-correlation scores with the measured class averages when compared to the most commonly used transmittance model. The thesis proves the viability of a particle-based Monte Carlo simulation of elec- tron microscope...
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Pattern recognition for in-game spell systems
 Mikuš, Pavel ; Kratochvíl, Miroslav (advisor) ; Šefl, Vít (referee)
Magic is a popular element in current computer games. Although most games spoil the sensation of magic as of something extraordinarily subtle by allowing the player to cast spells by simply hitting key combinations, several games require the player to finish a more complicated action before casting a spell: Drawing a complicated glyph that represents the spell is one of such actions. This thesis aims to provide a repurposable library that would allow simple implementation of structured glyph-drawing-based in-game spell systems. The thesis studies several relevant approaches to pattern recognition, describes a neural-network based method for recognition of various shapes and shape combinations, develops a system for describing the parameters and results of the used algorithm in terms of predefined spell shapes and their recognized combinations, and implements this approach in a library and an accompanying simple demonstrational game. The library and its parameters are benchmarked and systematically optimized.
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4 Mikuš, Peter
4 Mikuš, Petr
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