Evolutionary Algorithms Using Artificial Immune System

Import 22/07/2015Dnes jsou umělé imunitní systémy známy jako jedno z počítačových vědeckých odvětví, které se nechalo inspirovat biologickým imunitním systémem. Tato diplomová práce se nechala inspirovat řešením vědců X. He a L. Han \cite{23}], kteří se zabývali tématem využití umělého imunitního systému v diferenciální evoluci. Cílem této práce je provést implementaci práce zmiňovaných autorů a rozšířit funkcionalitu o pozitivní selekci a další druhy diferenciální evoluce. Následně je provedena sada experimentů pomocí testovacích problémů a jejich následné vyhodnocení.Nowadays artificial immune systems are known as one of the branches of computer science industry, inspired by biological immune system. This thesis was inspired by solution of sientists X. He and L. Han [23] who dealt with the theme of using artificial immune system in differential evolution. The aim is to implement the work of mentioned authors and extend the functionality of positive selection and other types of differential evolution. Subsequently, a set of experiments is executed using testing problems followed by their evaluation.460 - Katedra informatikyvelmi dobř

Behaviour Patterns for Robot Movement in Robot Soccer

Import 03/08/2012Hlavním cílem této bakalářské práce bylo seznámit se s danou problematikou detekce chování robotů a zvolenou metodiku zaimplementovat. Implementace byla vytvořena v programovacím jazyce C#, ve kterém je potřeba daný problém řešit. Při hře fotbalu robotů, jako při lidském fotbalu, je velmi důležité přizpůsobovat hru dle stylu hry soupeře. Proto je cílem této práce nalézt nejlepší způsob jak detekovat a predikovat soupeřovy strategie a pohyby pokud možno v reálném čase za běhu hry. Díky těmto strategiím lze adaptovat naše vlastní a posunout tým blíže k vítězství.The aim of this thesis is to introduce the topic of detection behavior of robots \linebreak and implement the chosen methodology. The implementation was developed in C# programming language in which it is necessary to solve the problem. In the game, soccer robots, as in human football, it is very important to adapt the game by the style of the opponent‘s game. Therefore, the aim of this work is to find the best way to detect and predict the opponent's strategy and moves in real time during the game. Thanks these strategies can adapt our own strategies and will move the team closer to victory.460 - Katedra informatikydobř

SUPERFLIP– a computer program for the solution of crystal structures by charge flipping in arbitrary dimensions

SUPERFLIP is a computer program that can solve crystal structures from diffraction data using the recently developed charge-flipping algorithm. It can solve periodic structures, incommensurately modulated structures and quasicrystals from X-ray and neutron diffraction data. Structure solution from powder diffraction data is supported by combining the charge-flipping algorithm with a histogram-matching procedure. SUPERFLIP is written in Fortran90 and is distributed as a source code and as precompiled binaries. It has been successfully compiled and tested on a variety of operating systems

Accurate lattice parameters from 3D electron diffraction data. I. Optical distortions

Determination of lattice parameters from 3D electron diffraction (3D ED) data measured in a transmission electron microscope is hampered by a number of effects that seriously limit the achievable accuracy. The distortion of the diffraction patterns by the optical elements of the microscope is often the most severe problem. A thorough analysis of a number of experimental datasets shows that, in addition to the well known distortions, namely barrel-pincushion, spiral and elliptical, an additional distortion, dubbed parabolic, may be observed in the data. In precession electron diffraction data, the parabolic distortion leads to excitation-error-dependent shift and splitting of reflections. All distortions except for the elliptical distortion can be determined together with lattice parameters from a single 3D ED data set. However, the parameters of the elliptical distortion cannot be determined uniquely due to correlations with the lattice parameters. They can be determined and corrected either by making use of the known Laue class of the crystal or by combining data from two or more crystals. The 3D ED data can yield lattice parameter ratios with an accuracy of about 0.1% and angles with an accuracy better than 0.03◦

At the Gates: The Tantalum-Rich Phase Hf3Ta2O11 and its Commensurately Modulated Structure

Generic mixtures in the system (Zr,Hf)O2–(Nb,Ta)2O5 are employed as tunable gate materials for field-effect transistors. Whereas production processes and target compositions are well-defined, resulting crystal structures are vastly unexplored. In this study, we summarize the sparse reported findings and present the new phase Hf3Ta2O11 as synthesized via a sol–gel route. Its commensurately modulated structure represents the hitherto unknown, metal(V)-richest member of the family (Zr,Hf)x(Nb,Ta)2O2x+5. Based on electron, neutron, and X-ray diffraction, the crystal structure is described within modern superspace [Hf1.2Ta0.8O4.4, Z = 2, a = 4.7834(13), b = 5.1782(17), c = 5.064(3) Å, q = 1/5c*, orthorhombic, superspace group Xmcm(00γ)s00] and supercell formalisms [Hf3Ta2O11, Z = 4, a = 4.7834(13), b = 5.1782(17), c = 25.320(13) Å, orthorhombic, space group Pbnm]. Transmission electron microscopy shows the microscopic structure from film-like aggregates down to atomic resolution. Cation ordering within the different available coordination environments is possible, but no significant hint at it is found within the limits of standard diffraction techniques. Hf3Ta2O11 is an unpredicted compound in the above-mentioned oxide systems, in which stability ranges have been disputably fuzzy and established only by syntheses via solid-state routes so far.DFG, SPP 1613, Regenerativ erzeugte Brennstoffe durch lichtgetriebene Wasserspaltung: Aufklärung der Elementarprozesse und Umsetzungsperspektiven auf technologische Konzept

SSZ-27: a small pore zeolite with large heart-shaped cavities determined using multi‐crystal electron diffraction

The high‐silica zeolite SSZ‐27 was synthesized using one of the isomers of the organic structure‐directing agent that is known to produce the large‐pore zeolite SSZ‐26 (CON). The structure of the as‐synthesized form was solved using multi‐crystal electron diffraction data. Data were collected on eighteen crystals, and to obtain a high‐quality and complete data set for structure refinement, hierarchical cluster analysis was employed to select the data sets most suitable for merging. The framework structure of SSZ‐27 can be described as a combination of two types of cavities, one of which is shaped like a heart. The cavities are connected through shared 8‐ring windows to create straight channels that are linked together in pairs to form a one‐dimensional channel system. Once the framework structure was known, molecular modelling was used to find the best fitting isomer, and this, in turn, was isolated to improve the synthesis conditions for SSZ‐27

Band structure of CuMnAs probed by optical and photoemission spectroscopy

5 pages, 5 figures + Supplementary InformationTetragonal phase of CuMnAs progressively appears as one of the key materials for antiferromagnetic spintronics due to efficient current-induced spin-orbit torques whose existence can be directly inferred from crystal symmetry. Theoretical understanding of spintronic phenomena in this material, however, relies on the detailed knowledge of electronic structure (band structure and corresponding wave functions) which has so far been tested only to a limited extent. We show that AC permittivity (obtained from ellipsometry) and UV photoelectron spectra agree with density functional calculations. Together with the x-ray diffraction and precession electron diffraction tomography, our analysis confirms recent theoretical claim [Phys.Rev.B 96, 094406 (2017)] that copper atoms occupy lattice positions in the basal plane of the tetragonal unit cell.We acknowledge support from National Grid Infrastructure MetaCentrum provided under the programme “Projects of Large Research, Development, and Innovations Infrastructures” (CESNET LM2015042); Grant Agency of the Czech Republic under Grant No. 15-13436S; CEDAMNF (CZ.02.1.01/0.0/0.0/15_003/0000358) of the Czech ministry of education (MŠMT) as well as its LM2015087 and LNSMLNSpin grants; Cariplo Foundation, Grant No. 2013-0726 (MAGISTER); Spanish MINECO under MAT2015-67593-P project and the ‘Severo Ochoa’ Programme (SEV-2015-0496); EU FET Open RIA Grant No. 766566; Engineering and Physical Sciences Research Council Grant No. EP/P019749/1. P.W. acknowledges support from the Royal Society through a University Research Fellowship.Peer reviewe