National Repository of Grey Literature 21 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Životní dráhy adolescentů s rizikovým chováním
Dvořák, Václav
The topic of the bachelor's thesis focuses on the life trajectories of adolescents with risky behaviour, which consists of a theoretical and practical part. In the theoretical part, the author addresses the question of why adolescents begin to engage in risky behaviour and details the factors that lead to this behaviour, including family, upbringing, peers and school. Next, the author examines the situation of adolescents with risky behavior in the criminal world and discusses various aspects of criminal careers, including participation, frequency, and length of career. The thesis also includes a chapter on primary prevention in education, and the final section focuses on two studies conducted to examine the impact of family and truancy on the development of risky behavior. The theoretical part used several graphical representations related to research and manifestations of risky behavior. Qualitative research was conducted as part of the bachelor's thesis to determine the influence of socialization factors on the development of risky behavior in adolescents. The research was conducted by interviewing four respondents who had and/or are experiencing risky behaviors.
Church of St. Jacob the Elder in Prague-Petrovice
Dvořák, Václav ; Šmied, Miroslav (advisor) ; Czumalo, Vladimír (referee)
Church of St. Jacob the Elder in Prague-Petrovice Abstract The main topic of this bachelor thesis is the parish church of St. Jacob the Elder in Petrovice, Prague and its cultural as well as historical development and changes. Its aim is to record and unify all known studies about the church, taking into account its development similarity with other churches around Prague and pointing out the uniqueness of its location. Among other things, the thesis could present the archival records from the 1940s which have not been published yet.
Assertion in Volleyball Specializations Depending on the Individual Somatic Type on the Regional Level
Dvořák, Václav ; Pokorný, Ladislav (advisor) ; Jahodová, Gabriela (referee)
SUMMARY: This paper seeks to examine the assertion of the volleyball players with different somatic type in particular volleyball specializations. To determine the somatic type of individual players, necessary anthropometric measurements have been done being important for its elaboration. Further the percentage players' fruitfulness in particular game activities was determined. For this purpose four regional volleyball matches were recorded and processed in detail. Professional literature dealing with the volleyball topics and somatic types was used as the source of information. The result of the elaborate will help to the volleyball teachers and coaches to group the players, according to their somatic type, into the specialization with the best possibility of their assertion. In addition the training can be accommodated to the somatic type and enable to increase the playing performance of the player.
Parallelization of Ultrasound Simulations Using 2D Decomposition
Nikl, Vojtěch ; Dvořák, Václav (referee) ; Jaroš, Jiří (advisor)
This thesis is a part of the k-Wave project, which is a toolbox for the simulation and reconstruction of acoustic wave felds and one of its main contributions is the planning of focused ultrasound surgeries (HIFU). One simulation can take tens of hours and about 60% of the simulation time is taken by the calculation of the 3D Fast Fourier transforms. Up until now the 3D FFT has been calculated purely by the FFTW library and its 1D decomposition, whose major limitation is the maximum number of employable cores. Therefore we introduce a new approach, called the 2D hybrid decomposition of the 3D FFT (HybridFFT), where we combine both MPI processes and OpenMP threads to reach as best performance as possible. On a low number of cores, on the order of a few hundreds, we are about as fast or slightly faster than FFTW and pure MPI 2D decomposition libraries (PFFT and P3DFFT). One of the best results was achieved on a 512^3FFT using 512 cores, where our hybrid version run 31ms, FFTW run 39ms and PFFT run 44ms. The most significant performance advantage should be seen when employing around 8-16 thousand cores, however we haven't had an access to a machine with such resources. Almost a linear scalability has been proven for up to 2048 employed cores.
3D printed directional antenna
Dvořák, Václav ; Horák, Jiří (referee) ; Láčík, Jaroslav (advisor)
This master thesis deals with a study of directional antennas, followed by their design and optimization of horn antenna based on SIW for Ka band (26,5- 40 GHz). The first part of the thesis contains the theoretical analysis of the different types of directional antennas, also the SIW technology is described here. It also describes the 3D printing technology by means of which the final antenna should be made. The next part of this work is about design of horn antenna based on SIW. Simulation and optimization of the antenna will be done using the CST Microwave Studio. The horn antenna was modeled with three different dielectric loads. The horn antenna with an experimental triangular dielectric load was chosen for fabrication. The fabricated antenna has reached almost the whole bandwidth to cover Ka. The antenna gain was 9,38 dBi for 33 GHz frequency.
3D printed directional antenna
Dvořák, Václav ; Horák, Jiří (referee) ; Láčík, Jaroslav (advisor)
This master thesis deals with a study of directional antennas, followed by their design and optimalization of horn antenna based on SIW for Ka band (26,5- 40 GHz). The first part of the thesis contains the theoretical analysis of the different types of directional antennas, also the SIW technology is described here. It also describes the 3D printing technology by means of which the final antenna should be made. The next part of this work is about design of horn antenna based on SIW. Simulation and optimization of the antenna will be done using the CST Microwave Studio. The final part of the thesis deals with evaluation of achieved results.
Church of St. Jacob the Elder in Prague-Petrovice
Dvořák, Václav ; Šmied, Miroslav (advisor) ; Czumalo, Vladimír (referee)
Church of St. Jacob the Elder in Prague-Petrovice Abstract The main topic of this bachelor thesis is the parish church of St. Jacob the Elder in Petrovice, Prague and its cultural as well as historical development and changes. Its aim is to record and unify all known studies about the church, taking into account its development similarity with other churches around Prague and pointing out the uniqueness of its location. Among other things, the thesis could present the archival records from the 1940s which have not been published yet.
Assertion in Volleyball Specializations Depending on the Individual Somatic Type on the Regional Level
Dvořák, Václav ; Pokorný, Ladislav (advisor) ; Jahodová, Gabriela (referee)
SUMMARY: This paper seeks to examine the assertion of the volleyball players with different somatic type in particular volleyball specializations. To determine the somatic type of individual players, necessary anthropometric measurements have been done being important for its elaboration. Further the percentage players' fruitfulness in particular game activities was determined. For this purpose four regional volleyball matches were recorded and processed in detail. Professional literature dealing with the volleyball topics and somatic types was used as the source of information. The result of the elaborate will help to the volleyball teachers and coaches to group the players, according to their somatic type, into the specialization with the best possibility of their assertion. In addition the training can be accommodated to the somatic type and enable to increase the playing performance of the player.
Packet Classification Algorithms
Puš, Viktor ; Lhotka,, Ladislav (referee) ; Dvořák, Václav (advisor)
Tato práce se zabývá klasifikací paketů v počítačových sítích. Klasifikace paketů je klíčovou úlohou mnoha síťových zařízení, především paketových filtrů - firewallů. Práce se tedy týká oblasti počítačové bezpečnosti. Práce je zaměřena na vysokorychlostní sítě s přenosovou rychlostí 100 Gb/s a více. V těchto případech nelze použít pro klasifikaci obecné procesory, které svým výkonem zdaleka nevyhovují požadavkům na rychlost. Proto se využívají specializované technické prostředky, především obvody ASIC a FPGA. Neméně důležitý je také samotný algoritmus klasifikace. Existuje mnoho algoritmů klasifikace paketů předpokládajících hardwarovou implementaci, přesto však tyto přístupy nejsou připraveny pro velmi rychlé sítě. Dizertační práce se proto zabývá návrhem nových algoritmů klasifikace paketů se zaměřením na vysokorychlostní implementaci ve specializovaném hardware. Je navržen algoritmus, který dělí problém klasifikace na jednodušší podproblémy. Prvním krokem je operace vyhledání nejdelšího shodného prefixu, používaná také při směrování paketů v IP sítích. Tato práce předpokládá využití některého existujícího přístupu, neboť již byly prezentovány algoritmy s dostatečnou rychlostí. Následujícím krokem je mapování nalezených prefixů na číslo pravidla. V této části práce přináší vylepšení využitím na míru vytvořené hashovací funkce. Díky použití hashovací funkce lze mapování provést v konstantním čase a využít při tom pouze jednu paměť s úzkým datovým rozhraním. Rychlost tohoto algoritmu lze určit analyticky a nezávisí na počtu pravidel ani na charakteru síťového provozu. S využitím dostupných součástek lze dosáhnout propustnosti 266 milionů paketů za sekundu. Následující tři algoritmy uvedené v této práci snižují paměťové nároky prvního algoritmu, aniž by ovlivňovaly rychlost. Druhý algoritmus snižuje velikost paměti o 11 % až 96 % v závislosti na sadě pravidel. Nevýhodu nízké stability odstraňuje třetí algoritmus, který v porovnání s prvním zmenšuje paměťové nároky o 31 % až 84 %. Čtvrtý algoritmus kombinuje třetí algoritmus se starším přístupem a díky využití několika technik zmenšuje paměťové nároky o 73 % až 99 %.
Design of Planar Optical Waveguide
Dvořák, Václav ; Friedl, Martin (referee) ; Nešpor, Dušan (advisor)
This bachelor´s thesis deals with the theoretical fundamentals of planar optical waveguides, possibilities of their fabrication and design of planar optical waveguide. Design of waveguide will be simulated using FDTD Solutions and Ansoft HFSS. These two software use different techniques for computational simulation. The parameters of waveguide will be modified to achieve better performance of waveguide. The result will be compare the properties of waveguides. There will be also described design of implementing waveguide.

National Repository of Grey Literature : 21 records found   1 - 10nextend  jump to record:
See also: similar author names
4 DVOŘÁK, Vlastimil
16 DVOŘÁK, Vojtěch
13 DVOŘÁK, Václav
14 DVOŘÁK, Vít
2 Dvořák, V.
2 Dvořák, Viktor
2 Dvořák, Vilém
2 Dvořák, Vladimír
3 Dvořák, Vladimír,
1 Dvořák, Vladislav
4 Dvořák, Vlastimil
16 Dvořák, Vojtěch
1 Dvořák, Vojtěch Adalbert
14 Dvořák, Vít
1 Dvořák, Vítězslav
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