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Antenna Mesurement System for Small Satellites
Dovičák, Ivo ; Pospíšil, Martin (referee) ; Urbanec, Tomáš (advisor)
Goal of this thesis was design and realization of a measurement system for measurement of reflection coefficient magnitude for connected antennas in 27-2500 MHz range. Measurement using resistive bridge is chosen as a suitable measurement method. System consists of electronic device controlled by STM32WB microcontroller unit and software for controller PC written in Python programming language using PyQt library. Communication between the device and controller PC is realized using Bluetooth interface. Circuitry for signal generation is based on Phase Locked Loop MAX2870. Device is powered from standard 18650 battery. Dimensions of the designed printed circuit board are suitable for use in CubeSat satellites. System can be used as a frequency synthesizer as well.
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RF Impairments: Estimation Compensation and Exploitation
Pospíšil, Martin ; Viščor, Ivo (referee) ; Galajda, Pavol (referee) ; Maršálek, Roman (advisor)
Předložená dizertační práce se zabývá hardwarovými nedokonalostmi rádiových transceiverů – zejména experimentálními měřicími test-bedy a technikami pro kompenzaci těchto nedokonalostí, ale na druhé straně také jejich využitím k zvýšení bezpečnosti při komunikaci mezi bezdrátovými zařízeními. Cílem první části práce je uvést danou problematiku, formulovat výzkumné otázky a poskytnout stručný přehled v oblasti hardwarových nedokonalostí a digitálních předzkreslovačů s nízkou výpočetní náročností, a dále seznámit čtenáře se základními metodami pro klasifikaci. Za nejdůležitější součást úvodní části práce je pak možné považovat přehled dosavadního vývoje v oblasti test-bedů pro experimenty s hardwarovými nedokonalostmi transceiverů v pásmu milimetrových vln. Jádro dizertační práce je tvořeno osmi vybranými publikovanými pracemi, doplněnými dílčími doplňujícími informacemi o provedených experimentech. Tři z těchto prací se zabývají využitím hardwarových nedokonalostí pro zvýšení bezpečnosti při komunikaci, dvě práce jsou zaměřeny na číslicové předzkreslení s nízkou výpočetní náročností, a zbývající tři publikace popisují měřicí test-bed v pásmu 60 GHz vytvořený na Ústavu radioelektroniky VUT v Brně.
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Editor's office workflow management system
Pospíšil, Martin ; Kopecký, Michal (advisor) ; Babka, Martin (referee)
Title: Editor's office workflow management system Author: Martin Pospisil Department: The Department of Software Engineering Supervisor: RNDr. Michal Kopecky, Ph.D., The Department of Software Engineering Abstract: The goal of this bachelor thesis is to analyze and implement an editorial system that supports the process management in a company which operates and administrates several web portals aimed to health care and medical science. The goal is to make the work within the company more effective a make the process management more transparent to decrease the amount of work that must be performed manually. It should lead to reducing the costs. The system ensures a complete evidence and management of the process of creating and publishing articles. Consequently it allows to automatically generate work reports which serve as the records for paying the editorial's office staff.
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Three essays on Joseph Stiglitz and information asymmetry
Pospíšil, Martin ; Mertlík, Pavel (advisor) ; Čech, Jan (referee)
This thesis contains three essays related to the work of economist Joseph Stiglitz. The first essay describes the contribution of Stiglitz to economic theory by analysing problems of information asymmetry, new Keynesian and institutional economics, rationality, and market theories. Shortcomings of neoclassical economics are described and possible solutions are outlined. The last part of this is essay summarizes the main critique to Stiglitz. The second essay applies the topic of information asymmetry by discussing whether the current level of economic development leads to convergence or divergence in the technology and information levels. The conclusion is that even though globalisation affects the level of technology and information, we do not see convergence as predicted by several theoretical models and information asymmetry remains an important element in the economy. The last essay links the Stiglitz-Greenwald theory of credit rationing using recent Czech data from years 2008 and 2009. Data confirm that credit rationing increases, information asymmetry increases, and the transmission mechanism does not function well during economic decline. I conclude that Czech banks increase their screening of clients and consequently credit rationing in the times uncertainty leading to ambiguous development...
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Tři eseje o Josephu Stiglitzovi a informačních asymetriích
Pospíšil, Martin ; Mertlík, Pavel (advisor) ; Čech, Jan (referee)
This thesis contains three essays related to the work of economist Joseph Stiglitz. The first essay describes the contribution of Stiglitz to economic theory by analysing problems of information asymmetry, new Keynesian and institutional economics, rationality, and market theories. Shortcomings of neoclassical economics are described and possible solutions are outlined. The last part of this is essay summarizes the main critique to Stiglitz. The second essay applies the topic of information asymmetry by discussing whether the current level of economic development leads to convergence or divergence in the technology and information levels. The conclusion is that even though globalisation affects the level of technology and information, we do not see convergence as predicted by several theoretical models and information asymmetry remains an important element in the economy. The last essay links the Stiglitz-Greenwald theory of credit rationing using recent Czech data from years 2008 and 2009. Data confirm that credit rationing increases, information asymmetry increases, and the transmission mechanism does not function well during economic decline. I conclude that Czech banks increase their screening of clients and consequently credit rationing in the times uncertainty leading to ambiguous development...
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Transformation of civil-military relations in Turkey during 1990-2016 period
Pospíšil, Martin ; Aslan, Emil (advisor) ; Horák, Slavomír (referee)
This bachelor thesis examines the possibility of application of the civil-military relations theory formulated by Paul Staniland on the environment of the Republic of Tureky in the 1990-2016 period. By analyzing each factor formulated by the theory, the thesis tries to answer a question whether this theoretical framework can explain the radical change of the civil-military relations, that Turkey underwent under the leadership of Recep Tayyip Erdogan. After the first part where the applied theory is described, the text is focused on the percieved threat environment, level of political institutionalization and the level of civilian government legitimacy. In the last part the most significant changes between years 1997 and 2016 are described and a conclusion is made, that the strenghtening of internal security forces and rise of civilian governement legitimacy played the most significant role in the transformation.
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Digital Predistortion Experiments with MATLAB-controlled Software Defined Radio
Pospíšil, Martin
This paper presents the experiments with digital predistortion for power amplifier linearization. It describes the architecture of used measurement setup based on the software defined radio USRP N200 with the focus on our custom MATLAB-based control of the USRP through UDP packets. Measurement results obtained for the 800 MHz power amplifier linearized by memory polynomial predistorter are presented, but the prepared framework to control of USRP in MATLAB can of course be used for experiments not only with such type of predistorter but for wide range of experiments where the USRP serves as the receiving/transmitting unit.
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Timer For RC Models
Fišer, Ondřej ; Pospíšil, Martin (referee) ; Šebesta, Jiří (advisor)
This paper describes complete design of timer for RC models. Described timer has three PWM outputs. With these outputs it is possible to connect two independent servo-motors and engine controller. 1 signal. The whole is controlled by 8-bit microprocessor. The time records are stored in external EEPROM, that can be programmed using I2C. Paper further discuss design of programming, which can be easily programmed the memory of EEPROM by the PC or smartphone. The goal of this paper is to design and build high quality RC timer with accessories.
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