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Attitudes and riskiness of the sexual behaviour of high school students in Prague related to HIV/AIDS infection
Moravcová, Pavla ; Weiss, Petr (advisor) ; Staňková, Marie (referee) ; Procházka, Ivo (referee)
1st Faculty of Medicine, Charles University in Prague Abstract of the dissertation thesis for the PhD course Medical psychology and psychopathology Attitudes and riskiness of the sexual behaviour of high school students in Prague related to HIV/AIDS infection Mgr. Pavla Moravcová, Prague Sept. 20th 2008 Objective: The purpose of the study is to map the components of attitudes, knowledge and behaviours related to the sexuality risky from the point of view of the HIV/AIDS infection in the students of last two years of grammar schools, specialized high schools and apprentice training centres (being the three basic types of Czech high school institutions) in Prague. Prague population is at highest risk of HIV/AIDS acquisition in the Czech Republic, adolescents being the most sexually active part of the population and the patterns of the young people's behaviour, as well as what they think and what they know needs to be monitored. Design and Method: The study is a quantitative survey of a sample of 500 male and 500 female students of the last two years of grammar schools, specialized high schools and apprentice training centres in Prague. The method of selection based on quotes was used, the quotes being: sex, type of school, and year of study. Results: A wide range of data about attitudes, knowledge and real...
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Quality of life and life satisfaction of people living with HIV/AIDS in the Czech Republic
Urbánková, Olga ; Weiss, Petr (advisor) ; Bahbouh, Radvan (referee) ; Procházka, Ivo (referee)
This study explores aspects of quality of life (QoL) and how QoL is influenced by HIV/AIDS. Two years ago, in 2006, HIV/AIDS celebrated its 25th anniversary since it was discovered. Of these 25 years, the last ten years were dedicated to research on QoL. The rationale is that even though the emergence of antiretroviral therapy (HAART) has prolonged HIV positive people's lives, this alone is not sufficient to make one's life good. Consequently, it has become necessary to pay attention to the quality of this extended life. There has been, so far, only one research dedicated to QoL among HIV positive people in the Czech Republic. According to UNAIDS, about forty million people are infected with HIV globally. By the end of February 2008, the Czech Republic had 1081 reported cases; yet very little has been done in the area of research on QoL among Czechs who are HIV positive. One study done by Potribná in 2002, on QoL (mainly Health) after starting HAART, uncovered a strong need for research on the QoL among people living with HIV in the Czech Republic.
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The Studies Order Processing in Selected Company
Tichá, Hana ; Ing. Vladimír Procházka. (referee) ; Jurová, Marie (advisor)
This bachelor’s thesis is dedicated to a study of order processing in selected company, concretely by Otis a.s, which deals with manufacturing and developing of escalators, Trav-O-lators and elevators. The thesis analyzes actual order processing in the company and specifies particular business processes. Consecutively it indicates new suggestions for improvement, which should shorten order’s processing in the company.
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Event Timing Device Providing Subpicosecond Precision
Pánek, Petr ; Kodet, J. ; Procházka, I.
We are reporting on the latest experimental results achieved with an event timing device using a surface acoustic wave filter as a time interpolator. During the tests of the first version of the device, the noise of the filter excitation was identified as the dominant source of the measurement error. Therefore a new concept of the excitation with very low level of the noise energy was designed. This new solution led to considerable improvement of the device performance. It results from the experimental measurements that the single shot precision is repeatedly lower than 500 fs RMS when time marks generated synchronously with the time base are measured. When asynchronous time marks are split into two event timers and the resulting time difference is measured, the single shot precision is below 700 fs RMS per channel. In this case the measurement is affected not only by random errors, but also by non-linearity of the time interpolation. The temperature dependence is below 0.1 ps/K. Operating the device in a common laboratory environment without temperature stabilization, the stability TDEV better than 3 fs has been routinely achieved for range of averaging intervals from 10 s to several hours
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Single Photons Optical TwoWay Time Transfer Providing Picosecond Accuracy
Procházka, I. ; Blažej, J. ; Kodet, J. ; Pánek, Petr
We are reporting on a new approach to an optical two-way time transfer based on signals of individual photons. This approach enables to reach extreme timing stabilities and minimal systematic errors using existing electro-optic technologies. In our indoor experiment we have achieved sub-picosecond precison and 3 ps accuracy of a two-way time transfer via free space optical channel. The entire system is compact and simple. It is a perspective technique for space application, where it might provide picosecond accuracies over space distances
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Local ties controlin application of laser time transfer
Kodet, J. ; Schreiber, U. ; Eckl, J. ; Procházka, I. ; Pánek, Petr
In many fundamental physical experiments time plays an important role. The standard way for the comparison of time and frequency is the application of GNSS signals and the Two-Way Satellite Time and Frequency Transfer - TWSTFT. This technique is based on radiofrequency signal transmission. Recently, there was a rapid increase of optical time comparison development, which uses the Satellite Laser Ranging network (SLR). Currently the French project T2L2 is in operation on board of Jason 2 and the European Space Agency project ELT in support of the Atomic Clock Ensemble in Space (ACES) is under development. The goal of both projects is the time synchronization with a precision below 40 ps rms and an absolute error well below 100 ps. Comparing the results of the optical time transfer with the GNSS time comparison requires unprecedented control of the local ties between the different observation techniques. One of the possible methods is the application of the Two Way Time Transfer (TWTT) on a single coaxial cable. Such a system can be implemented using two or more event timers, which are interconnected by a standard coaxial cable.
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VLBI receiver chain monitoring
Michálek, V. ; Kodet, J. ; Schreiber, U. ; Ploetz, Ch. ; Procházka, I. ; Pánek, Petr
he most demanding goal of the Global Geodetic Observing System initiative is the definition of station positions to an accuracy of 1mm and the corresponding velocities to 0.1 mm/year. The main remaining sources of error are caused by systematics, leading to intra- and inter- technique biases. In this work, we have focused on Very Long Base Interferometry (VLBI) and phase calibration generator currently in operation. This unit is injecting calibration tones into the detection chain through an input coupler located near the input of the antenna. The tones propagate further through entire detection chain and are recorded with the observed signal. Then they are extracted in post processing. These tones are generated out of an atomic frequency standard. The supplied frequency is significantly influenced by temperature and mechanical changes since usually a long cable is employed to bring the frequency to the calibration unit. To monitor the electrical length of the cable, calibration with a picosecond precision is essential. We have redesigned a phase calibration unit so that it enables the implementation of the Two Way Time Transfer (TWTT) method on single coaxial cable using two event timers to monitor the electrical length of the critical cable. Such a system has been installed in parallel to the unit currently in operation. The comparison of the TWTT method with previous measurement method is presented
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Comparison of ORM frameworks for PHP
Procházka, Ivan ; Pavlíčková, Jarmila (advisor) ; Schrotter, Michal (referee)
This study deals with a comparison of object relational mapping frameworks for PHP program language. On theoretical review, it describes the possibilities of mapping and available design patterns for mapping are presented. Basic principles of object oriented programming and relational databases are surveyed. For a comparison of tools, a model case of a library is suggested and implemented in chosen tools. Based on specified criteria, a comparison of selected frameworks is given. The main goal is to evaluate features of chosen frameworks, demonstrate their usage on the model case of a library and summarize the possibilities of object relational mapping on PHP platform.
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