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Automation of nuclear fuel visual inspection
Knotek, Jaroslav ; Blažek, Jan (advisor) ; Horáček, Jan (referee)
The safety and performance of nuclear plant relies, among others, on the quality of nuclear fuel. The quality fulfilling designed criteria of the fuel in use is inspected and reported on periodically. Visual inspection focuses on the condition of the fuel based on its visual properties. During the inspection, the fuel is being recorded and analysed by the inspector. The current state of the fuel assemblies is compared to the historical statistics which helps do decide whether this particular assembly remains or gets replaced. This thesis describe a project initiated by Centrum Výzkumu Řež focusing on digital image processing methods application to visual inspection process. The result of the project is a tool that accelerates the process of report making. Firstly, it transforms the inspection video into one image overview and highlight a significant part (more than 95%) of possible defects to the inspector. 1
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The influence of morphometric changes of gray and white matter on brain functional connectivity in schizophrenia
Görnerová, Natálie ; Horáček, Jiří (advisor) ; Zach, Petr (referee) ; Filip, Pavel (referee)
More than a century has passed since a clear definition for schizophrenia was established, yet, the etiology, neuropathological and pathophysiological mechanisms of this psychiatric disorder still, to a large extent, remain to be elucidated. In the theoretical part of this dissertation, we review current classification and pathophysiology of schizophrenia, paying a particular attention to the findings from structural and functional imaging techniques. These techniques demonstrate that patients with schizophrenia tend to have reduced volume of grey matter, reduced integrity of white matter and a disrupted inter-regional functional connectivity (FC). The temporal association between structural changes, already detectable on imaging before symptoms appear, and development of disrupted FC remains to be uncovered. At the same time, current knowledge does not fully explain the link between disrupted FC and disturbed experience of self-awareness, a core symptom of schizophrenia. In addition, it is necessary to develop novel effective methods to prevent relapse and prevent the progression of neurobiological changes in the brain. In the practical part of this dissertation, we designed a study with three different groups of subjects aiming to fulfil three key aims that would help us to fill the gaps in...
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Damping of human vocal folds vibration
Radolf, Vojtěch ; Horáček, Jaromír ; Bula, Vítězslav ; Geneid, A. ; Laukkanen, A. M.
This study investigates the biomechanics of the end-part of phonation, i.e. the so-called phonation offset, experimentally. This information of vocal fold damping is important for testing and further development of mathematical modelling of phonation. The measurements of the damping ratio, based on high-speed videolaryngoscopic registrations, were realized on a male subject phonating on the vowel [o:]. The results show during the phonation offset a remarkable decrease of vibration frequency of the vocal folds and an increased damping ratio limiting to the value D≈ 0.2. The results for vocal folds’ damping are in agreement with previous measurements performed on humans using different methods.
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Accelerating cross-correlation with GPUs
Maděra, Karel ; Kruliš, Martin (advisor) ; Horáček, Jan (referee)
Cross-correlation is a commonly used tool in the field of signal processing, with ap- plications in pattern recognition, particle physics, electron tomography, and many other areas. For many of these applications, it is often the limiting factor on system perfor- mance due to its computational complexity. In this thesis, we analyze the cross-correlation algorithm and its optimization and parallelization possibilities. We then implement sev- eral optimizations of the definition-based algorithm, mainly focused on parallelization using the Graphical processing unit (GPU). Even though the definition-based algorithm provides many possibilities for parallelization, the implementation needs to solve several problems, such as the algorithm's low arithmetic intensity. Furthermore, the problems differ between computation types, which include cross-correlating a pair of inputs, one in- put with many other inputs, or many inputs with many other inputs. Lastly, we compare the optimizations of the definition-based algorithm with the asymptotically faster and commonly used algorithm based on the Fast Fourier Transform. Depending on the total size of the data, we achieve parity between the two algorithms for matrix sizes ranging from 60x60 to 150x150, allowing performance improvements for systems using matrices smaller...
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Estimation of damping in human vocal folds vibration: measurements in vivo and on model
Horáček, Jaromír ; Radolf, Vojtěch ; Bula, Vítězslav ; Košina, Jan ; Geneid, A. ; Laukkanen, A. M.
This study investigates the biomechanics of the end-part of phonation, i.e. the so-called phonation offset, experimentally. This information of vocal folds damping is important for testing and further development of mathematical modelling of phonation. The measurements of the damping ratio, based on high-speed videolaryngoscopic registrations, were realized in vivo on a male subject and in vitro using an originally developed silicon replica of the human vocal folds. In both cases the results show remarkable decrease of vibration frequency of the vocal folds and increase of damping ratio D in the phonation offset limiting to the values D=0.12 in vivo measurement and D=0.11 in vitro measurement. The results for vocal folds’ damping are in good agreement with previous measurements performed in humans using different methods.
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Manufacturing of aquaria Brno
Horáček, Jan ; Mikeš, Stanislav (referee) ; Nový, Alois (advisor) ; Bečkovská, Tereza (advisor)
The subject of this bachelor thesis was to design a new aquarium manufacture in Brno for Pavlica corporation. Project is based on architecture study done in subject AG035 Architecture design studio undertook in the sixth semester of bachelor´s study. The plot is located to the south of Brno in Horní Heršpice by the Sokolova Street. There are factory buildings in the wider neighbourhood but in the immediate area around the plot there are prevailing residential buildings and a railway. Civic facilities can be found in the walking distance. The area is classified as a brownfield intended for building. The plot has a slight slope in the direction of Sokolova Street. The building is designed in the shape of the letter “U”. Two story administration part and representative part dedicated to the public can be found in the front of the object. Main manufacture hall is connected to administration part and is linked to the exterior via section gate. Perpendicularly to the main manufacture hall is carpentry with storage and waste. The carpentry is also linked to the exterior via section gate. The section gates lead to manipulation yard in the back of the plot which is connected to Sokolova Street via road. There is a parking lot situated along this road. The façade of the building is created from advanced glass wall with designed support system. In the centre of the building is semi-public atrium with garden.
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Truck Braking System
Horáček, Jonáš ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
The aim of this bachelor thesis is to examine truck braking systems and their components due to the construction and to describe their cooperation. The first part deals with brake definition and with dividing brakes into different categories. The second part focuses on compressed air brakes, truck trailer brakes and retarders. The thesis has a research character and the last part deals with possible trends in the development of truck braking systems.
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Perfusion studies
Ulman, Attila ; Pelikán, Josef (advisor) ; Horáček, Jan (referee)
Perfusion data (dynamic contrast-enhanced image data) are used to characterize regional tissue perfusion. Perfusion data consist of a sequence of images, acquired after a contrast agent is applied. Perfusion studies are used for diagnostic purposes in oncology, ischemic stroke assessment, or myocardial ischemia. The diagnostic evaluation of perfusion data is challenging, because the data is very complex and exhibits various artifacts (e.g. motion). Important aspect in the diagnosis of perfusion data is the correlation between perfusion data and derived time-intensity curves (TIC) as well as with other image data, in particular with high-resolution morphologic image data. The present work is focused mainly on cerebral, brain perfusion studies. The thesis studies their medical background as well as the process and possibilities of their examination. Discusses different ways of processing of perfusion series and designs own approach. The work also includes an overview of possibilities for every single step of the processing procedure (registration, segmentation, analysis and visualization) and selection of the most suitable approach for the particular part of processing in the context of cerebral perfusion studies. Results of the work also include a multiplatform application enabling study and analysis of...
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3D Physics Toolbox with Haptics Support
Čermák, Jakub ; Kmoch, Petr (advisor) ; Horáček, Jan (referee)
The main goal of this thesis is to create software which would allow a user to simulate and study physical processes in systems of mass particles, which follow laws of classical mechanics and can collide together. The simplicity and easiness of control was emphasized, which corresponds to support of haptic devices, which can be used both for influencing running simulation and creation of the scene. It is possible to change parameters in physical properties of objects and environment (like gravitation or air density) and also to visualize affecting forces and other properties. It allows the user to explore physical processes. This work uses knowledge from many fields - mass particle mechanics, numerical integration used for application of physical laws, algorithms for effective collision detection and haptic interaction and force rendering.
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Volumetric data processing for CT enterography
Horáček, Jan ; Pelikán, Josef (advisor) ; Czanner, Silvester (referee) ; Schier, Jan (referee)
Title: Volumetric data processing for CT enterography Author: Jan Horáček Department: Department of Software and Computer Science Education Supervisor: RNDr. Josef Pelikán, Department of Software and Computer Sci- ence Education Abstract: The overall goal of our work is to develop algorithms for efficient processing, segmentation and tracking of the small intestine in CT enterography scans. The small intestine is a complex organ, the shape of which can vary con- siderably between patients: and in addition to this, its location and shape can change significantly between subsequent scans of the same person. The CT en- terography process uses contrast agents to improve the visibility of the intestine, so that various potentially problematic features, such as inflammations, obstruc- tions and so on, can be properly seen. However, due to the convoluted shape of the organ, manual diagnosis of raw CT enterography data is still a difficult and time-consuming task, and is prone to diagnostic errors. We have prepared a set of methods for automatic preprocessing, segmentation and tracking of such data that aims at providing a much clearer data visualization: such tools can greatly improve the diagnostic process. Our first contribution is to make a high quality denoising method for volumet- ric data practically usable: so...
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