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Terrain modelling and walk-through
Křižka, Radek ; Krajíček, Václav (referee) ; Pelikán, Josef (advisor)
My thesis deals with terrain modelling and scene displaying. The main subject of modelling is the terrain as well as objects, that can be found on it. Terrain data may be random so hey cannot include information about the position of each object (e.g. a tree or abush). This is the aim of our modelling; given the entry data, we must be able to generate objects at positions that would be as close to reality as possible. The last, but certainly not least part of the project is displaying the model-scene with the possibility of a walk-through. We will be introduced to various object types, possibilities of displaying optimization and we'll explore the "Level of detail" techniques. The result is an application displaying the described techniques on an example scene with a few types of brushwood including the possibity of an interactive walk-through.
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Modeling of Respiratory System
Matoušek, Josef ; Roleček, Jiří (referee) ; Jiřík, Radovan (advisor)
This thesis is concerned with respiration system simulation. The main goal of this studies is to gain knowledge of how human respiration system works, along with selecting proper algorithms and their implementation into mathematic model. These models are realized by Simulink interface, which is part of Matlab environment. Similar models are used for medical technology research, especially for artificial ventilation of the lungs. There is a practical utilisation of these models suitable for illustration and respiration system's biological processes simulation, particularly combined model described in GUIDE graphic interface - also implemented in Matlab environment.
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Acceleration of Lattice-Boltzmann Algorithms for Bloodflow Modeling
Kompová, Radmila ; Kešner, Filip (referee) ; Jaroš, Jiří (advisor)
This thesis aims to explore possible implementations and optimizations of the lattice-Boltzmann method. This method allows modeling of fluid flow using a simulation of fictive particles. The thesis focuses on possible improvements of the existing tool HemeLB which is designed and optimized for bloodflow modeling. Several vectorization and paralellization approaches that could be included in this tool are explored. An application focused on comparing chosen algorithms including optimizations for the lattice-Boltzmann method was implemented as a part of the thesis. A group of tests focused on comparing this algorithms according to performance, cache usage and overall memory usage was performed. The best performance achieved was 150 millions of lattice site updates per second.
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Intra- and Out-of-Vehicle Channel Measurements and Modeling
Kukolev, Pavel ; Masopust, Jiří (referee) ; Wieser, Vladimír (referee) ; Prokeš, Aleš (advisor)
Disertační práce je zaměřena na měření a modelování kanálu uvnitř a vně vozidla pro komunikaci a lokalizaci. Pro účely vytvoření integrovaného inteligentního dopravního systému ITS (Intelligent transportation system) je důležitý odhad vlastnosti kanálů pro vnitřní a venkovní scénáře. Za tímto účelem je vhodné provést řadu činností, které jsou obsahem disertační práce: Simulace fyzické vrstvy 802.11p, její srovnávání s 802.11a, měření kanálu pro různé scénáře pro 802.11p a pro širokopásmový systém (UWB), vytvoření modelů kanálů pro 802.11p a UWB a výzkum vlastností lokalizace založené na měření v pásmu UWB. Výzkum komunikace vozidla s okolím založená na IEEE 802.11p standardu. Jedním z cílů disertační práce je ukázat rozdíly mezi standardy fyzické vrstvy IEEE 802.11a a IEEE 802.11p prostřednictvím simulace s použitím modelu kanálu HIPERPLAN/2. V práci je uvedena simulace přenosu signálu 802.11p kanálem ITU-R M.1225 s odlišným zpožděním a středním výkonem (pro chodce a vozidla). Vliv kanálu na signál je analyzován za použití simulace v prostředí MATLABu pomocí vyhodnocení chybovosti. Určení vlastností kanálů v kmitočtovém pásmu 5,8 GHz pro standard IEEE 802.11p a UWB. Experimenty byly prováděny pro vnitřní a vnější prostředí vozidla. Bylo zjištěno, že pro protokol 802.11p může být trend (dlouhodobý vývoj) profilu PDP (power delay profile) nejlépe aproximován pomocí modelu obsahujícího dvě klesající exponenciální funkce, na rozdíl od Saleh-Valenzuelova (S-V) modelu, který je více vhodný pro UWB systémy pracující v pásmu 3 až 11 GHz. Vytvoření odpovídající impulzní odezvy (CIR) s využitím trendu PDP. Informace o CIR byla použita pro simulaci 802.11p za účelem vyhodnocení chybovosti při použití Ricianova modelu. Výsledky odhadu BER ukazují vhodnost protokolu pro vnitřní a vnější prostředí bezdrátových aplikací. Výsledky simulací dále ukazují, že se chybovost zásadně nemění a proto je možné určit střední křivku BER pro celou sadu změřených dat. Určení vlivu malé změny polohy antény na vlastnosti kanálu. Práce ukazuje náhodnost parametrů UWB kanálu pro malé změny polohy antény okolo vozidla, zaparkovaného v podzemní garáži. Ztráty šířením jsou monotónně rostoucí se vzdáleností, avšak náhodně se mění v závislosti na úhlu a výšce antén, a proto je vyhodnocení vzdálenosti pomocí síly signálu pro tyto scénáře nevhodné. Na druhé straně může být pro spolehlivé určení vzdálenosti bez ohledu na úhel nebo výšku antény použita doba příchodu prvního svazku. Ověření vlivu změn konfigurace kanálu na parametry S-V modelu. Práce demonstruje závislost parametrů Saleh-Valenzuela modelu v na vzdálenosti a výšce antén, avšak ukazuje, že jejich průměrné hodnoty jsou blízké IEEE 802.15.3 standardu. Ověření možnosti lokalizace pomocí metody TOA (time of arrival). Vzdálenost mezi anténami byla určena z profilu PDP s využitím lineární závislosti vzdálenosti na zpoždění. Souřadnice vysílací antény byly nalezeny pomocí dvou přijímacích antén pomocí 2-D lokalizační techniky TOA. Porovnání vypočtených souřadnic s původními vykazuje chybu menší než 6%, což ukazuje vhodnost navrženého přístupu pro lokalizaci vozidel.
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The meaning art therapy for the development of individual personality with visual impairment
WOHNIGOVÁ, Veronika
The objective of this study is to identify the influence of art therapy on personality development of visually impaired individuals. Art therapy - an expressive therapy - is aimed at changing the behavior, thinking and emotions of a person with the use of art. Drawing is the basic diagnostic means in art therapy. The advantage of such form of therapy is that every individual is to some extent capable of expressing himself or herself through art. The goal of using art therapy with visually impaired individuals is to allow and teach them how to artistically express themselves. This thesis has two major parts theoretical and practical. The theoretical part is then divided into three chapters; first chapter describes the different categories of visual impairment. The last section of this chapter discusses possible sensory compensations for eye disabilities and overviews the various forms of low vision aids and devices. The second chapter characterizes the development of individuals with congenital and acquired visual impairment. Such disability means a great cognitive, motor and social limitation these domains are the concern of individual subchapters. The last chapter of theoretical part of this study deals with art therapy itself. It defines the concept of art therapy, its aims and goals and the basic artistic forms. The practical part of this thesis deals with research goals and research questions. A quantitative research has been used to collect the necessary data. It included the following methods: data analysis, semi structured interview and participant observation. Three volunteering respondents residing in South Bohemia participated in this investigation. The goal of this thesis is to determine the significance of art therapy for people with visual impairment. This goal has two major purposes. The first one is to identify how art therapy contributes to the development of upper limbs motor skills and tactile perception in combination with the individual's level of visual impairment. With the use of participant observation the following three areas have been examined: hand movement and coordination, thumb opposition and upper limb action. It was concluded that the major contribution of art therapy for visually impaired people consists in training and improving their tactile perception, haptic memory and gaining experience with various structures and materials. For individuals with low vision impairment is limited sight is still the dominant sense. With low vision individuals, art therapy helps skill improvement. The second purpose is to identify the contribution of art therapy to socialization of visually impaired people. Socialization in this context means communication, self-esteem and individual life quality perception. The data collected for this research reveal that art therapy greatly contributes to communication; creativity and artwork interpretation directly influences the development of communication. Research aimed at self-esteem shows that although visually impaired individuals were not satisfied with their artwork in the beginning of their therapy, later they noticed improvement and thus more confidence. Conclusions about their life quality perceptions can be drawn from their own artwork interpretations. The data collected for this research revealed differences in opinions. Individuals with congenital blindness exhibited relative satisfaction with their lives, as opposed to individuals with acquired low-vision impairment. The results of this thesis can be used as a study material or as an information source for this field's expert community or as an initiative for related institutions. They can also be used to determine the conditions for sensory development of visually impaired people and to establish the use of Axman modelling technique in practice.
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Model Study of Ultrasound Effects on Fetal Development
Jaroš, Josef ; Halámek, Josef (referee) ; Hrazdíra,, Ivo (referee) ; Rozman, Jiří (advisor)
The progress in ultrasound techniques goes hand in hand with increasing of diagnostic machine acoustic outputs. Ultrasound biological effects can adversely influence the development of human fetus. Recent studies of thermal effect on biological tissues are usually based on simulation of simple ultrasound transducers. The aim of this work is to build a flexible model of diagnostic system to simulate temperature increase during fetal development. Different types of ultrasound probes were used for generation of acoustic field with simulated piezoelectric element properties. Optimized linear and phased arrays were modeled with dynamic beam steering and focus. Computer simulations were concentrated on extreme conditions in obstetric ultrasonography and 3D tissue model was compared with real ultrasound probes measurements. To detect temperature increase, the bone tissue phantom was used. Results point out potential risks for fetus with diagnostic ultrasound probes. Based on the results of this work, practical recommendations increasing safety of obstetric examinations were drawn.
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WLAN and Bluetooth Systems Coexistence
Mikulka, Jan ; Hanus, Stanislav (advisor)
The dissertation thesis deals with a WLAN and Bluetooth systems coexistence. A Bluetooth standard works in an unlicensed frequency band 2,402 – 2,480 GHz. This frequency band is also used by an IEEE 802.11b/g standard (Wi-Fi) which is the most extended representative of WLAN networks. Because Bluetooth and Wi-Fi systems operate in the same frequency band, a mutual signal degradation may appear, when devices are collocated in the same area. In the first part of the dissertation thesis there is a brief summary of 2,402 - 2,480 GHz frequency band regulations and its usage. There are described physical layers of Bluetooth and IEEE 802.11b/g standards and techniques used for a collision avoidance. The main part of the dissertation thesis deals with a development of a new Matlab Simulink model for investigations of the Bluetooth and Wi-Fi standards coexistence. Physical layer models and results of the coexistence simulations are verified by a measurement in real conditions with a help of a modern vector signal analyzer. The results are presented in a graphical form and a brief summary is attached at the end of each chapter. Corresponding tables of simulated and measured values are available in the enclosed CD.
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Techniques of modeling in kindergarten
VÁLKOVÁ, Tereza
This thesis deals with the modeling techniques in kindergarten. There is an art project created by modeling, which is divided into three groups according to the material used. In each group are two art ideas for working with children. In the theoretical part describes the children's artistic expression, the role of art education in kindergarten, the development of artistic expression, modeling in kindergarten, modeling clay, and especially in modeling methodology management in children. Furthermore ceramics in kindergarten, technical guidelines for working with clay, ceramic materials, glazes and ceramics rules for the novice. The practical part consists of visual modeling project for which they were designed with three ideas art modeling materials. Each theme is described in detail, is given as the procedure needs and motivational activities. These suggestions are verified in practice in three kindergartens. The work is accompanied by photographs.
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Ion beam modification of materials for optics, electronic and spintronics -ion implantation using accelerators or laser induced plasma ion generation
Macková, Anna
Ion beam modification offers a broad field of the creating the new functional materials and nano-structures for optics, electronics, spintronics and other material branches. Using ions produced by ion accelerators or implanters\nmeans the usage of the monoenergetic beams for precise doped layer, nano-particles or cluster creation by varying the ion implantation specie versus matrix combination together with the implantation energy, ion flux etc. Recently\nappears the multienergetic ion implantation which is realized by using of the intense laser shot generating plasma from the specially designed targets, where the ions are accelerated and can be then implanted into the various\nmaterials. This contribution will present an overview and comparison of different ion beam modification techniques, plasma ion implantation will be also mentioned.
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Special technical solutions in vacuum technology
SZABÓ, Robin
This thesis is focussed on the realisation of various technical solutions for microwave plasma apparatus. The theoretical part focuses on vacuum and general terms that are related. Attention was paid for example to definition of pressure, to pressure and central free track, units of measurement of pressure and their conversions. This part includes the classification of vacuum according to pressure. The next section of the dissertation is concerned with achieving vacuum including a description of rotary oil and turbo molecular pump. Part of the thesis includesa description of plasma microwave apparatus CX22 which was used during realisation of this dissertation. There is also a description of vacuum chamber, gas pump system, system of gas lead, microwave source, evaporator of liquid precursor and mixing apparatus. In the practical section a measurement of physical and technological quantity included. This part covers the inflow of apparatus measurement and temperatures of substrate during plasma process. In the next part there is a description of specific technical solutions suggested by the dissertation author. Amongst suggested technical solutions in this paper there is vacuum isolator, heating system of evaporator pipe, box of an evaporator of liquid precursor, ''gas ring'' and tablet equipment. Vacuum isolator was designed by 3D simulation and serves as a connection to detection technology. Heating of pipes of an evaporator were constructed to improve quality of the plasma process. The box of an evaporator was suggested for maintaining fresh air in a lab. A Gas ring was also designed by 3D simulation and serves as a specially adjusted pipe for bringing vapour of precursor near the substrate. The tablet equipment was constructed for unified preparation of compressed powder cellulosic tablets. Also from the available vacuum pumps, multilevel pumping was constructed that helped achievement of reduced lowest pressure.
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