|
|
Blind Image Deconvolution of Electron Microscopy Images
Schlorová, Hana ; Odstrčilík, Jan (referee) ; Walek, Petr (advisor)
V posledních letech se metody slepé dekonvoluce rozšířily do celé řady technických a vědních oborů zejména, když nejsou již limitovány výpočetně. Techniky zpracování signálu založené na slepé dekonvoluci slibují možnosti zlepšení kvality výsledků dosažených zobrazením pomocí elektronového mikroskopu. Hlavním úkolem této práce je formulování problému slepé dekonvoluce obrazů z elektronového mikroskopu a hledání vhodného řešení s jeho následnou implementací a porovnáním s dostupnou funkcí Matlab Image Processing Toolboxu. Úplným cílem je tedy vytvoření algoritmu korigujícícho vady vzniklé v procesu zobrazení v programovém prostředí Matlabu. Navržený přístup je založen na regularizačních technikách slepé dekonvoluce.
|
|
|
Regularization of Illegal Migration as a Policy-making Process
Dumont, Anna ; Novotný, Vilém (advisor) ; Jelínková, Marie (referee)
'Regularization of Illegal Migration as a Policy-making Process' deals with the social problem of having a high number of irregular migrants in the Czech Republic and regularization as a tool that could help reduce it. Regularization is seen as a political process theoretically described by using the Advocacy Coalition Framework. This thesis tries to find normative definitions of the two coalitions, which hold different beliefs and two different points of view rather than describe the problem. The work is partly designed as a case study in which the theory is applied to the issue of regularization in part there is also an explanation of regularization as well as the Advocacy Coalition Framework. The thesis defines the two coalitions within the subsystem - the for-regularization and anti-regularization coalitions. Each coalition has its deep core and policy core beliefs that determine the relationship to the topic as well as the relationship between the coalitions themselves. In conclusion, the author summarized the information about the coalitions and their belief in three comparative tables where one can confront their approaches. The last part also contains a chapter on The Changes of Beliefs and Policies, where there is an introduction of two policies: the system of voluntary return and that...
|
|
|
Modifications of stochastic objects
Kadlec, Karel ; Štěpán, Josef (advisor) ; Dostál, Petr (referee)
In this thesis, we are concerned with the modifications of the stochastic processes and the random probability measures. First chapter is devoted to modifications of the stochastic process to the space of continuous functions, modifications of submartingale to the set of right-continuous with finite left-hand limits functions and separable modifications of stochastic process. In the second chapter is the attention on the regularization of random probability measure in Markov kernel focused. In particular, we work with random probability measures on the Borel subset of the Polish space, or Radon separable topological space.
|
|
|
Implementation of restoring method for reading bar code
Kadlčík, Libor ; Bartušek, Karel (referee) ; Mikulka, Jan (advisor)
Bar code stores information in the form of series of bars and gaps with various widths, and therefore can be considered as an example of bilevel (square) signal. Magnetic bar codes are created by applying slightly ferromagnetic material to a substrate. Sensing is done by reading oscillator, whose frequency is modulated by presence of the mentioned ferromagnetic material. Signal from the oscillator is then subjected to frequency demodulation. Due to temperature drift of the reading oscillator, the demodulated signal is accompanied by DC drift. Method for removal of the drift is introduced. Also, drift-insensitive detection of presence of a bar code is described. Reading bar codes is complicated by convolutional distortion, which is result of spatially dispersed sensitivity of the sensor. Effect of the convolutional distortion is analogous to low-pass filtering, causing edges to be smoothed and overlapped, and making their detection difficult. Characteristics of convolutional distortion can be summarized into point-spread function (PSF). In case of magnetic bar codes, the shape of the PSF can be known in advance, but not its width of DC transfer. Methods for estimation of these parameters are discussed. The signal needs to be reconstructed (into original bilevel form) before decoding can take place. Variational methods provide effective way. Their core idea is to reformulate reconstruction as an optimization problem of functional minimization. The functional can be extended by other functionals (regularizations) in order to considerably improve results of reconstruction. Principle of variational methods will be shown, including examples of use of various regularizations. All algorithm and methods (including frequency demodulation of signal from reading oscillator) are digital. They are implemented as a program for a microcontroller from the PIC32 family, which offers high computing power, so that even blind deconvolution (when the real PSF also needs to be found) can be finished in a few seconds. The microcontroller is part of magnetic bar code reader, whose hardware allows the read information to be transferred to personal computer via the PS/2 interface or USB (by emulating key presses on virtual keyboard), or shown on display.
|
|
|
Napoleon´s theorem
MRÁZ, Luděk
The target of the this diploma thesis called ''The Napoleon's theorem'' is a detailed concentration on this theorem, where the process of so called ''regularization'' is described. Under the investigation of the Napoleon's theorem this diploma thesis is concerned with a lot of proofs, properties and then their generalization in a plane and in space. Pictures, which can help the reader to understand this problem are supplemented in this diploma thesis.
|
|
|
Economics of Biased Estimation
Drvoštěp, Tomáš ; Špecián, Petr (advisor) ; Tříska, Dušan (referee)
This thesis investigates optimality of heuristic forecasting. According to Goldstein a Gigerenzer (2009), heuristics can be viewed as predictive models, whose simplicity is exploiting the bias-variance trade-off. Economic agents learning in the context of rational expectations (Marcet a Sargent 1989) employ, on the contrary, complex models of the whole economy. Both of these approaches can be perceived as an optimal response complexity of the prediction task and availability of observations. This work introduces a straightforward extension to the standard model of decision making under uncertainty, where agents utility depends on accuracy of their predictions and where model complexity is moderated by regularization parameter. Results of Monte Carlo simulations reveal that in complicated environments, where few observations are at disposal, it is beneficial to construct simple models resembling heuristics. Unbiased models are preferred in more convenient conditions.
|
|
|
The issue of illegal migration and various approaches to its solution
PROCHÁZKOVÁ, Lenka
This thesis deals with the issue of illegal migration in the Czech Republic and various approaches to its solution. First of all, it provides a complex survey of the problem. It views the problem in the context of international migration, labor migration and the legislative framework of the Czech Republic, as regards its relation to foreigners. The goal is to compare and evaluate individual possibilities of dealing with illegal migration from the point of view of governmental and non-governmental institutions, and to propose an optimal solution. The thesis presents indepth interviews with representatives of seven different institutions. It turns out that particular solutions of illegal migration can not be separated, rather they must be viewed in the context of all other solutions. The priorities of the fight with illegal migration are the following: cooperation with countries of origin, enlightenment of both, potential immigrants as well as their potential employers, getting rid of ``push{\crqq} factors in countries of origin, and elimination of the main ``pull{\crqq} factor which is the possibility of getting an illegal job in the target country. The main output of my thesis research is pinpointing recommendations and conclusions which should be considered when looking for an optimal solution to the issue of illegal migration. I also present a few hypotheses for further research. When looking for an optimal solution the crucial task is played by the high-quality discussion on both levels, the professional as well as the public one. I suppose that this work has enhanced such discussion, furthermore, it can enhance such debate in the future too.
|
|
|
Mathematical Modelling of Generalization
Kůrková, Věra
Learning with generalization can be modeled using regularization, which was developed for a search of stable solutions of tasks for physics. In learning theory generalization can be understood as a certain kind of stability.
|
|
|
Regularization of illegal migration
Smrčinová, Zuzana ; Druláková, Radka (advisor) ; Abrhám, Josef (referee)
This thesis introduces the phenomenon of illegal migration and the ways of its solution. This thesis focuses on the way of regularization or legalization of the illegal status of the foreigner already residing in the state. In the thesis, the meaning of regularization is presented and an analysis of the three european countries with regularization experience is made. The experience of these three countries can be an inspiration for Czech Republic which has been facing the phenomenon of illegal migration for a short time and refuses the regularization at this moment. At the end of this thesis, there are some proposals on what the Czech republic should concern about before the debates about the regularization. The thesis deals also with the conditions under which the regularization would be meaningful if the Czech Republic considers it.
|
|
|
Effects of legal and illegal immigration in the Czech Republic
Medková, Alena ; Macáková, Libuše (advisor) ; Pavelka, Tomáš (referee)
The thesis deals with the issue of immigrants in the Czech Republic. It starts with a brief history of migration in the world, later only focused on the Czech circumstances. Later, it describes the present state of migration in the Czech Republic. The theoretical part includes the development of legal and illegal immigration in the Czech Republic and some of the principles and programs of the Czech government. The first of programs is The selection of qualified foreign workers, in which the Czech government aims to attract skilled foreigners to the Czech Republic. The second project is called Voluntary returns, in which the Czech government assists legal and illegal immigrants with their repatriation. The third project is called Regularization and it copes with the legalization of illegally staying and working immigrants.The practical part consists of a questionnaire survey among the citizens of the Czech Republic and an interview with an alien, who has resided in the Czech Republic for several years. The goal of the questionnaire is to examine the opinion of Czech citizens to immigrants and their views on the approach of the Czech government in this field. The interview presents the issue form the other perspective, the view of immigrants. The aim of this work is to analyse the asylum and migration policy in the Czech Republic and study the opinions of Czech citizens to immigrants in the Czech Republic.
|
guest ::
