|
PSO-algorithms and possibilities for their use in cryptanalysis.
Svetlíková, Lenka ; Tůma, Jiří (advisor) ; Hojsík, Michal (referee)
The aim of the thesis was to investigate the usage of PSO algorithm in the area of cryptanalysis. We applied PSO to the problem of simple substitution and to DES attack. By a modified version of PSO algorithm we achieved better or comparable results as by the usage of other biologically motivated algorithms. We suggested a method how to use PSO to attack DES and we were able to break it with the knowledge of only 20 plain texts and corresponding cipher texts. We have analyzed the reasons of failure to break more than a 4 rounds of DES and provided explanation for it. At the end we described the basic principles of differential cryptanalysis for DES and presented a specific mo- dification of PSO for searching optimal differential characteristics for DES. For simple ciphers, PSO is working efficiently but for sophisticated ciphers like DES, without in- corporating deep internal knowledge about the process into the algorithm, we could not expect significant outcomes. 1
|
|
Efficient Gathering of Performance Information on Multicore Systems
Tůma, Tomáš ; Yaghob, Jakub (referee) ; Tůma, Petr (advisor)
Modern multicore processors provide performance counters that export information on various essential aspects of software execution, from instruction decoding to cache utilization. Typically, a processor is capable of counting a small subset from hundreds of different event types, the events themselves can occur almost every processor clock tick. This yields a significant amount of data which is difficult to collect without disrupting the execution itself. The goal of the thesis is to apply compressive sampling - a special method of sampling signals that allows to reconstruct sparse signal from a small number of samples - to the performance counter data.
|
|
Constraint modelling
Haničinec, Tomáš ; Surynek, Pavel (referee) ; Barták, Roman (advisor)
Constraint programming is one of the possible ways how to solve complicated combinatorial (and other) problems. We model a problem using variables representing real world objects and constraints representing various relations between the objects. However, there are often many possible ways how to model a problem. And what's more, the choice of a modeling strategy can a®ect the resulting efficiency dramatically. Unfortunately, there is no general recipe how to model problems e±ciently. Nevertheless there are still several modeling techniques, heuristics or advices that could improve the e±ciency of models. Some of these techniques are problem dependent, some can be applied only to a certain classes of problems but they still often help. This thesis is trying to give more or less complete list of the most important modeling techniques along with an explanation of why, how and for which classes of problems they work best and also with empirical results underlying the presented facts.
|
|
Prevention of Breast Cancer
Bárta, Daniel ; Šafář, Petr (advisor)
Breast cancer is the most frequent women's oncogenous disease. The efficient epidemiological observation of the occurrence of this disease can give the explanation of cooperating factors of the breast cancer inception and it serves as one of the initial points when working out the screening programme. The continuously on-going research in many countries tries to explain the pathogenesis of breast cancer inception. The research is mainly focused on the detection of the changes on the genom level with the help of molecular biology methods. The detailed observation of genetic changes in tumorous cells will probably lead to the revaluation of the breast malignities classification, which will be based on the molecular substance of the tumour inception and will become the basis for the targeted therapy, being directed against the defined neoplastic changes in the particular kind of tumour. Owing to the limited possibilities to apply primary preventive care the secondary prevention is the cardinal point. As the early discovery of the disease nowadays still represents the basis for the successful therapy, the contribution of screening programmes is great. Mammography has appeared to be a suitable detective method for the screening. Nowadays the professionals try to make the screening coverage of the particular...
|
|
Efficient Gathering of Performance Information on Multicore Systems
Tůma, Tomáš
Modern multicore processors provide performance counters that export information on various essential aspects of software execution, from instruction decoding to cache utilization. Typically, a processor is capable of counting a small subset from hundreds of different event types, the events themselves can occur almost every processor clock tick. This yields a significant amount of data which is difficult to collect without disrupting the execution itself. The goal of the thesis is to apply compressive sampling - a special method of sampling signals that allows to reconstruct sparse signal from a small number of samples - to the performance counter data.
|
|
Selected legal instruments used in the enforcement process of cartel agreements
Šemora, Vítězslav ; Boháček, Martin (advisor) ; Raus, David (referee)
The focal point of the dissertation is the term of cartel, which could be described as agreements distorting competition concluded by competitors on the horizontal level of the market, and, above all, legal instruments which are used in the process of detecting and punishing cartels. In particular, the dissertation thesis deals with three of possible instruments used in the enforcement process of cartels, i.e. with dawn rides (unannounced on-the-spot inspections/investigations carried out in business and non-business premises), sanctions and sanction policies and with the leniency programs. These instruments are generally thought to be the most important and most effective tools in the enforcement process of cartels and necessary precondition of efficiency of competition law itself. In accordance with the topic, the dissertation thesis is divided into three parts. The first part is concerned with theoretical and normative definitions of agreements distorting competition and cartels. The main purpose of this part is to provide basic characteristics of these terms and to describe them in a way which will create a basement for explanation of the three legal instruments, which form the focal point of the thesis. Second, fundamental part of the dissertation, deals with commentary to selected legal instruments, mentions already above. In particular it consists of three chapters, each one dealing with one of the instruments in question. In the final part of the dissertation are introduced conclusions and evaluations of the three legal instruments and also some proposals pro futuro.
|
|
Social economics and a treatment of unemployment in towns and regions
Kozák, Petr ; Kadeřábková, Jaroslava (advisor) ; Jetmar, Marek (referee)
The diploma thesis "Social economics and a treatment of unemployment in towns and regions" addresses on an area of social enterprise and also has an ambition to proof, that in this area is hidden a huge potential for future resolutions of unemployment of specific group of people. The thesis is divided into two main parts. First which is theoretic and methodical is based on explanation of a basic terms, a description of previous development of this phenomena in Czech Republic and in selected european countries. It also deals with definitions of basic relationships occuring in this economic area. An essential component is also a legal basis and an explanation of a regularization of social enterprise. The second part is focused on an established and efficient subject in an area of the social enteprise in Czech republic. There are calculated all pros and cons of a given organization with a consideration of theoretical knowledge from first part of the thesis. The main target is to proof, that those companies, organizations and firms which are based on "social-economical" aproach should be maintained not only for their social aspects, but also for their financial assets for public sector and private sector aswell.
|
|
DEA models and application on bank branch site
Kostiha, Martin ; Jablonský, Josef (advisor) ; Tichý, Filip (referee)
This diploma thesis is focused on evaluation of efficiency of domestic bank branch site using Data Envelopment Analysis (DEA). The branch site belongs to Československá obchodní banka (ČSOB). Theoretic part is focused on explanation of basic definitions related to DEA. I concentrate on basic models which are applicated in practical part of the thesis. Practical part of the thesis is focused on computation, using particulary BCC a CCR model. General information about bank market in the Czech Republic, ČSOB and using DEA in bank sector are included too.
|
|
The control of public procurement processes
Bachan, Milan ; Pavel, Jan (advisor) ; Pavel, Jan (referee)
This Thesis deals with he situation in public procurement processes in Czech republic. Thesis firstly analyzes the legislation of public procurement as well as theoretical explanation how supervisory process works and contains also brief characteristic of main supervisory bodies - Nejvyšší kontrolní úřad a Úřad pro ochranu hospodářské soutěže. The main purpose of this thesis is to find how effective and efficient the supervisory process is in real life. In order to to find it, I worked out a research on the basis of the law of providing information. The research was oriented on subjects, which according to supervisory bodies did not proceed the public procurements process as they should and some of them were awarded a fine. The main purpose of this research was to find out, what steps these subjects took in order not to repeat the situation and also if they draw personal responsibility or claim a loss. The results were analyzed if the public procurement process in Czech republic is effective and efficient, and if subjects in real life observe what is given in law.
|
|
Analyses and rationalization of reverse logistics within DHL Exel Supply Chain, Automotive UK
Beneš, Martin ; Pernica, Petr (advisor) ; Jirsák, Petr (referee)
This diploma thesis has been created based on the demand of the management of DHL Exel Supply Chain and Swindon Pressings Limited to increase the efficiency and utilization of resources employed within they operations. The theoretical introduction part is first of dealing with the terms "logistics" and "supply chain management" in the perspective of their use in the contemporary logistics theory, comparison of their meaning (are there differences) and explanation of their use in this thesis. Subsequently I am explaining "reverse logistic" and its position in the structures of corporations and logistics itself. Supply chain management and the concept of lean manufacturing combined with the six sigma approach are, from my point of view, essential for today's supplier-customer relationships. That is why those topics are examined in the last part of the theoretical chapter. Returnable packaging and the transport process are key elements of the second part -- practical part, the reengineering of logistics processes which occurred at Swindon Pressings Limited. The aim of this thesis is to analyze the give problem, develop problem solving options and critically comment them. Finally choose one of the options, implement it and document the process of "going live".
|
guest ::
