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Multimedia Services in Mobile Networks
Kovář, Petr ; Molnár, Karol (advisor)
Long time ago, there were developed methods which can allow fast exchange of information at the longest distance possible. Until recent time, the possibilities of long way communications were very limited. There were technological and financial limitations mainly. With telegraph, telephone and the newest – computer networks invention, the telecommunication services became cheaper and much more comprehensive. With accession and high scale spread of internet, the role of communications is much more important. The most actual trend is mobile internet and connected multimedia networks and their instant accessibility from anywhere. On the first side there are classical telecommunication networks as GSM, UMTS, on the other side there is very strong alternative in shape of WiMAX and WiFi networks combination. For the usage of multimedia services in that networks is very important to handle their prefferization over other traffic, which is very difficult task even on wireless media. For the finding of new processes and methods, which can allow it, there is, at fist, the need for highly accurate and authentic mathematical models. In this doctoral thesis is mapped actual state of the art and proposed the new mathematical model of Distribution Coordination Function, which is much-frequent used as access method in 802.11 networks, Wi-Fi.
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Speckle Tracking Echocardiography
Strecha, Juraj ; Drahanský, Martin (referee) ; Mráček, Štěpán (advisor)
he thesis deals with proposal of an algorithm and implementation of a program that tracks a motion of the heart muscle in the captured ultrasound video of the heart. The point position estimation is calculated by optical flow method. The Active Shape Model method is used to confirm the accuracy of point's position tracking. The user annotates desired structure of the heart arch first and the application displays new points which represent a new deformed heart shape.
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The role of credit default swaps during the subprime mortgage crisis in 2007-2009
Lazukićová, Andrea ; Teplý, Petr (advisor) ; Vozková, Karolína (referee)
This thesis focuses on the role of credit default swaps during the subprime mortgage crisis 2007-2009 with special focus on mortgage-backed securities. In the empirical part of the thesis, three models are constructed. All of them have the same dependent variable, a mortgage delinquency rate in the 2005-2010 period, and independent variables representing various types of credit default swaps issued. Streamlined in each model, credit default swaps (CDS) were divided based on certain criteria (underlying sectors, maturity and ranking) and subsequently compared and analysed. By using the probit model, the main research question "How the probability of mortgage delinquency depends on the volume of credit default swaps issued?" was inspected. The contribution of this thesis is three-fold. First, we show that a delinquency rate of mortgages was correlated with the maturity of CDS issued (the delinquency rate was higher for short-term loans). Second, we state that the volume of subprime loans increased along with the volume of issued CDS, what contradicts to the insurance nature of a CDS. Finally, a mortgage delinquency rate was lower in the 2006-2008 period than in 2009-2011, what implies the domino effect of failing mortgages had an immense impact even after the global crisis.
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The role of credit default swaps during the subprime mortgage crisis in 2007-2009
Lazukićová, Andrea ; Teplý, Petr (advisor) ; Vozková, Karolína (referee)
This thesis focuses on the role of credit default swaps during the subprime mortgage crisis 2007-2009 with special focus on mortgage-backed securities. In the empirical part of the thesis, three models are constructed. All of them have the same dependent variable, a mortgage delinquency rate in the 2005-2010 period, and independent variables representing various types of credit default swaps issued. Streamlined in each model, credit default swaps (CDS) were divided based on certain criteria (underlying sectors, maturity and ranking) and subsequently compared and analysed. By using the probit model, the main research question "How the probability of mortgage delinquency depends on the volume of credit default swaps issued?" was inspected. The contribution of this thesis is three-fold. First, we show that a delinquency rate of mortgages was correlated with the maturity of CDS issued (the delinquency rate was higher for short-term loans). Second, we state that the volume of subprime loans increased along with the volume of issued CDS, what contradicts to the insurance nature of a CDS. Finally, a mortgage delinquency rate was lower in the 2006-2008 period than in 2009-2011, what implies the domino effect of failing mortgages had an immense impact even after the global crisis.
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Speckle Tracking Echocardiography
Strecha, Juraj ; Drahanský, Martin (referee) ; Mráček, Štěpán (advisor)
he thesis deals with proposal of an algorithm and implementation of a program that tracks a motion of the heart muscle in the captured ultrasound video of the heart. The point position estimation is calculated by optical flow method. The Active Shape Model method is used to confirm the accuracy of point's position tracking. The user annotates desired structure of the heart arch first and the application displays new points which represent a new deformed heart shape.
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Multimedia Services in Mobile Networks
Kovář, Petr ; Molnár, Karol (advisor)
Long time ago, there were developed methods which can allow fast exchange of information at the longest distance possible. Until recent time, the possibilities of long way communications were very limited. There were technological and financial limitations mainly. With telegraph, telephone and the newest – computer networks invention, the telecommunication services became cheaper and much more comprehensive. With accession and high scale spread of internet, the role of communications is much more important. The most actual trend is mobile internet and connected multimedia networks and their instant accessibility from anywhere. On the first side there are classical telecommunication networks as GSM, UMTS, on the other side there is very strong alternative in shape of WiMAX and WiFi networks combination. For the usage of multimedia services in that networks is very important to handle their prefferization over other traffic, which is very difficult task even on wireless media. For the finding of new processes and methods, which can allow it, there is, at fist, the need for highly accurate and authentic mathematical models. In this doctoral thesis is mapped actual state of the art and proposed the new mathematical model of Distribution Coordination Function, which is much-frequent used as access method in 802.11 networks, Wi-Fi.
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Analysis of similarities of results at admission tests on FIS
Habarta, Filip ; Mazouch, Petr (advisor) ; Malá, Ivana (referee)
The aim of this work is the analysis of admissions to undergraduate study to the academic year 2014/2015 on the Faculty of informatics and statistics of University of Economics, Prague. This analysis is focusing mainly on the problem of cheating during the admission tests. For this purpose probability model that reveals suspiciously high number of matches of answers on the test questions between the participants is being used. Model is calculated by script that was created as part of this thesis. This script can be used for different data sets. Part of the thesis analyzes data obtained from the admissions on the basic statistical level. Final evaluation of the admissions and suggestions of precautions measures are summarized in the end of this thesis.
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