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Corporate education and its relationship to mobilty and motivation
Chmel, Václav ; Kuchař, Pavel (advisor) ; Grznár, Miroslav (referee)
Bachelor thesis concerns with corporate education and in its context concerns also with mobility in company and motivation to education. The thesis elaborates wider background to this topic, which is seen in the relationship of work and knowledge. The development, which it follows, is culminating in facts, which some theorists identify as aspects of the knowledge society. Corporate education is understood as a part of lifelong learning and its basic characteristics are described. The thesis also briefly describes the issues of mobility of workers in the company and their motivation for corporate education. The author used this background as a basis for practical research carried out in the technical section of airline, which examined the attitudes of its staff to issue of the thesis. The research is focused on the business aviation sector, which provides specific conditions for worker mobility, and for the motivation for learning. The selected airline was chosen because of its size and broadly conducted corporate education. The research shows that employees perceive their corporate education positively, but that they do not see it as a good instrument for mobility in company. Their motivation to participate in corporate education seems to be various. The thesis also describes some aspects of corporate...
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The trisection problem
Švecová, Michaela ; Šarounová, Alena (referee) ; Bečvář, Jindřich (advisor)
Na/ev prace: Trisekce uhlu. zajimave pfibli/.ne melody Autor: Michacla Sveeova Katedra (uslav): Katedra didaktiky matematiky Vedouei bakalafske prace: doc. RNDr. Jindfieh Becvaf, CSc. e-mail vedoueiho: beevano^karlin.mff.cuni.c/ Abslrakt: Tato pracc se zabyva problemein trisekce uhlu, coz je jedna z klasickych uloh fecke malematiky. Krome duka/u, /e tato uloha neni eukleidovsky fesitelna, jsou zde uvedeny ru/ne metody, k nimT: matematici beliem rady staleti dosli. Jednak to jsou postupy ,,pfesne", ktcre nejakym /pusobem porusuji pravidla cukleidovskyeh konstrukci. dale pak ..nepfesne" poslupy provadcne pouze za pomoci pravitka a kruzitka. Zde je mira nepresnosti odhadnuta vypoelem odchylky od occkavane tfetiny iihlu pro nektere specialni velikosti uhlu. Dale sc prace zabyva ruznymi nastroji - trisektory - pomocf nich/ l/e uhcl tfctinovc velikostijednoduse najit. Klicova slova: trisekce uhlu. eukleidovske konstrukcc, recka matematika Title: The Triseclion Problem Author: Michaela Sveeova Deparment: Department of Mathematics IZducation Supervisor: doc. RIM Dr. Jindfieh Becvar, CSc. Supervisor's e-mail adrcss: becvar(^karlin.mff.cuni.cx Abstract: This work deals with the problem of the angle triscclion which is one of the classical tasks of the Greek mathematics. Besides proving that this problem has no...
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The Business-Related and Logistical Challenges of Entering the African Solar Market. Illustrated on the Example of Solarity.
Widauer, Philipp ; Vinš, Marek (advisor) ; Kolář, Petr (referee)
The thesis evaluates the principal business-related and logistical opportunities and risks on the African solar market which is often associated to offer the last unexploited economic opportunities on this planet. For this purpose, the author examines three major African trade unions and reviews the strengths and weaknesses of each regional coalition. It becomes obvious that each respective trade bloc contains one dominant player, in this case Nigeria, Kenya and South Africa. The practical section starts with an analysis of the appropriate entry market for the Czech solar wholesaler Solarity. Subsequently, the author identifies South Africa as the best fitting market primarily because of good infrastructure, high purchasing power and a similar business culture. The author recommends that Solarity should apply an exporting entry mode due to its size and inexperience on the African market. Secondary research, first-hand experience and close cooperation with Solarity support the author in his final conclusions.
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Magnetism in transition metal oxides
Burianová, Simona ; Kalbáčová Vejpravová, Jana (advisor)
Title: Magnetism in transition metal oxides Author: Simona Burianová Department: Department of Condensed Matter Physics Supervisor: RNDr. Jana Poltierová Vejpravová, Ph.D. Supervisor's e-mail address: jana@mag.mff.cuni.cz Abstract: The CoFe2O4 nanocrystals are highly attractive due to their magnetic properties - large coercivity (up to 2 T at low temperatures) with moderate saturation magnetization (80 A.m2 .kg-1 ), remarkable chemical stability and mechanical hardness. Upon RE doping, a significant change of the properties is expected. This thesis is focused on investigation of Co1- xLaxFe2O4, x = 0.05 - 0.5 and CoLaxFe2-x O4 x = 0.05 - 0.2 nanoparticles prepared by sol-gel and microemulsion method, respectively, with varying particle size according to the final heat treatment. In the former case, the particles were embedded in amorphous SiO2 matrix, while in the latter case, the samples were matrix-free. The samples were characterized using X-ray diffraction and Mössbauer spectroscopy. Measurements of the temperature dependence of the ZFC-FC magnetization revealed that the blocking temperature is above the room temperature. The values of coercivity and saturation magnetization strongly depend on particles size determined by method of preparation. The higher coercivity values of about 2 T at 10 K show the...
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Parameterized Complexity
Suchý, Ondřej ; Kratochvíl, Jan (advisor) ; Telle, Jan Arne (referee) ; Obdržálek, Jan (referee)
Title: Parameterized Complexity Author: Ondřej Suchý Department: Department of Applied Mathematics Advisor: Prof. RNDr. Jan Kratochvíl, CSc. Advisor's e-mail address: honza@kam.mff.cuni.cz Abstract: This thesis deals with the parameterized complexity of NP-hard graph problems. We explore the complexity of the problems in various scenarios, with respect to miscellaneous parameters and their combina- tions. Our aim is rather to classify in this multivariate manner whether the particular parameters make the problem fixed-parameter tractable or intractable than to present the algorithm achieving the best running time. In the questions we study typically the first-choice parameter is unsuccessful, in which case we propose to use less standard ones. The first family of problems investigated provides a common general- ization of many well known and studied domination and independence problems. Here we suggest using the dual parameterization and show that, in contrast to the standard solution-size, it can confine the in- evitable combinatorial explosion. Further studied problems are ana- logues of the Steiner problem in directed graphs. Here the parameter- ization by the number of terminals to be connected seems to be previ- ously unexplored in the directed setting. Unfortunately, the problems are shown to be...
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Artificial neural networks for clustering and rule extraction
Iša, Jiří
Title: Artificial neural networks for clustering and rule extraction Author: Jiří Iša Department: Department of Software Engineering Supervisor: RNDr. Iveta Mrázová, CSc. Supervisor's e-mail: mrazova@ksi.ms.mff.cuni.cz Keywords: fuzzy, rules, extraction, neural network Abstract: Rule extraction with neural networks has been a com- mon research topic over the last decades. This master thesis proposes a novel growing fuzzy inference neural network, based on the principle of growing neural structures. This allows the network to adjust iteratively its number of hidden neurons. For the purpose of this network an existing clustering algorithm is en- hanced to improve the sensitivity to the requested output. A novel fast weights adaptation, inspired by the fuzzy set theory, is also suggested. The characteristics of the proposed model and a new method of the selection of significant input features support the induction of a relatively small amount of simple fuzzy rules. The introduced techniques have been exper- imentally tested on real-world data describing the relationship between various types of housing in the Boston area and its price. The data was obtained from the "Boston housing" dataset.
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Top-trees implementation
Šofka, Jiří ; Mareš, Martin (referee) ; Majerech, Vladan (advisor)
Title: Top Trees implementation Author: Jifi Sofka Department: Department of Theoretical Computer Science and Mathemat- ical Logic Supervisor: Mgr. Vladan Majerech, Dr. Supervisor's e-mail address: Vladaii.Majerech@mff.cmii.cz Abstract: Dynamic data structure Top Trees is used to represent a tree by a binary structure of tree contractions. Vertices of such a binary tree are called clusters. Each cluster represents one contraction and contains aggregated data of its children. One of the main advantages of Top Trees is the separation of cluster's data management into Create, Destroy, Join, Split and Select functions which are automatically called as the internal structure of Top Trees changes. The implementation of Top Trees is therefore independent of all the properties that are tracked about the original tree (i.e. 2-connecticity, tree median). The size of cluster's aggrefated data about one tree property may de- pend on the size of the entire original tree and its calculation can be time consuming. The operations used to query the Top Tree about different tree properties often result in Top Tree structural changes. In the original Top Tree design, each of the affected clusters needs to update the data belong- ing to all tracked properties when such structural change occurs. Not all of the properties are...
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Příprava magnetických a optických nanočástic
Repko, Anton ; Němec, Ivan (referee) ; Nižňanský, Daniel (advisor)
Title: Preparation of magnetic and optical nanoparticles Author: Anton Repko Department: Department of Inorganic Chemistry, Faculty of Science, Charles University of Prague Supervisor: RNDr. Daniel Nižňanský, Ph.D. Supervisor's e-mail address: niznansk@natur.cuni.cz Abstract: In the present work we study methods of preparation of magnetic and optical nanoparticles by hydrothermal method. Specifically, we prepared particles of cobalt ferrite (CoFe2O4) and sodium yttrium fluoride (NaYF4) doped by Yb3+ a Er3+ from corresponding nitrates in the system of water - ethanol - oleic acid, and in modified systems. By this method, it is possible to prepare particles of narrow size distribution (monodisperse particles). Pre- pared particles of ferrite show superparamagnetism and particles of NaYF4 up-conversion, i.e. conversion of infrared (980 nm) to visible light. Keywords: nanocrystals, superparamagnetism, up-conversion, CoFe2O4, NaYF4, hydrothermal synthesis
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Relativistic Theory of Electron Transport in Magnetic Layers
Sýkora, Rudolf ; Turek, Ilja (advisor) ; Šob, Mojmír (referee) ; Drchal, Václav (referee)
Title: Relativistic Theory of Electron Transport in Magnetic Layers Author: Rudolf Sýkora Department / Institute: Institude of Theoretical Physics Supervisor of the doctoral thesis: doc. RNDr. Ilja Turek, DrSc., Department of Condensed Matter Physics Abstract: We review the density-functional theory (DFT) in detail using the Levy Lieb ap- proach. The Kohn Sham scheme is discussed, starting from the simplest spinless non- relativistic case, then including spin and considering potential spin magnetism, and finally deriv- ing the full Kohn Sham Dirac relativistic scheme. The Linear Muffin-Tin Orbital (LMTO) method for electronic-structure calculation is presented, together with mentioning the necessary changes to include the spin-orbit (SO) interaction effects to an otherwise scalar-relativistic (SR) theory. Derivation of an electronic-conductance formula for a layered system is given, based on the Landauer scattering picture and using simple non-equilibrium Green functions. The formal- ism is applied to layered metallic systems of light elements Co, Ni, Cu elements, and to layered systems with a tunnelling barrier, Fe/MgO/Ag and Fe/GaAs/Ag. The effects of the SO interac- tion on the Giant Magnetoresistance (GMR) ratio and/or the Tunnelling Anisotropy Magnetore- sistance (TAMR) for these systems are discussed....
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Microstructure and mechanical properties of lightweight structural AZ31 alloy prepared by twin-roll casting method.
Zimina, Mariia ; Cieslar, Miroslav (advisor)
Title: Microstructure and mechanical properties of lightweight structural AZ31 alloy prepared by twin-roll casting method Author: Mariia Zimina Abstract: Microstructure of AZ31 twin-roll cast magnesium alloy was studied using light optical, electron and atomic force microscopy. The effect of annealing temperature on the microstructure was tested. Mechanical properties of a thin magnesium strip were investigated by means of microhardness tests and tensile tests at a relatively low strain rate 10-3 s-1 . Results show that the ductility of the twin roll cast strip increases with increasing deformation temperature, however, a remarkable decrease was observed at about 200 řC. This effect appears also in a conventionally cast ingot of a master alloy and is caused by a change of a deformation mode occurring at this temperature. Moreover, the effect of severe plastic deformation on the microstructure and mechanical properties was studied. Equal channel angular pressing was applied on magnesium strip samples and lead to a significant grain refinement accompanied by an unfavorable strengthening of the initial basal texture, which is effectively suppressed by a subsequent annealing. A constrained groove pressing was for the first time successfully applied on AZ31 twin-roll cast strip leading to an increase of...
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