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Utilization of brain connectivity in classification and regression tasks in brain data
Řežábková, Jana ; Hartman, David (advisor) ; Neruda, Roman (referee)
This thesis investigates how incorporating progressive amounts of struc- tural information into machine learning models affects their accuracy in dis- criminating schizophrenia from functional connectivity matrices obtained by resting state functional magnetic resonance. Three structural settings were explored-no structure via traditional machine learning models, modeling nodes through proposed feed forward based architecture that allows com- bining node neighborhoods individually for each node, and modeling both nodes and edges using graph neural networks. Although the results on the available 190 subjects dataset did not reveal the best strategy, two findings were identified (a) the superiority of sparsifiying matrices by taking top k neighborhoods over keeping top n% values and (b) the benefit of node cor- respondence across samples. All experiments were evaluated using a proper validation strategy-nested cross validation-a piece that was largely missing in reviewed literature.
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Speed of sound prediction
Řežábková, Jana ; Hartman, David (advisor) ; Brabec, Marek (referee)
This bachelor thesis presents a novel approach for speed of sound pre- diction in aqueous electrolytic solutions using machine learning techniques. A single model capable of accurately predicting the speed of sound in se- lected electrolytic aqueous solutions at different temperatures and molalities is trained. The machine learning experiment is designed to exploit the dis- sociation of electrolytes in water. Electrolytes are viewed as cation/anion pairs. Therefore, electrolyte description is based purely on its constituting ions. This approach allows to view the available data as a matrix in which rows represent cations, columns anions and each cell a full electrolyte. The idea of being able to fill cells for which no speed of sound data is yet avail- able is tested within the thesis. The final model's accuracy is compared to existent research on speed of sound prediction. However, some of the model approaches are novel and have no existing comparable settings. 1
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The prevalence of overweight and obesity at Secondary School Pupils in the Region Jindřichohradecko
ŘEŽÁBKOVÁ, Jana
This bacherlos thesis deals with problem prevalence of obesity and overweight among students at the second of primary school in region Jindřichohradecko. Theoretical part is characterised by problems overweight and obesity, prevalence itself, causes and factors. The main part of my bachelors thesis was independent research. Anthropometric measurments were attended by 204 students, including 81 boys and 123 girls. I measured body hiát, body weight, hip circumference and waist, birth weight and birth length. Body mass index was percentile graphs for girl and boys.
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Synthesis and coordination behaviour of 3-(diphenylphosphino)propanamide
Řežábková, Jana ; Štěpnička, Petr (advisor) ; Havlíček, David (referee)
This bachelor thesis describes the synthesis of 3-(diphenylphosphino)propanamide (compound 1) and subsequent preparation of two palladium(II) complexes with the synthesized phosphinoamide ligand. The coordination behaviour of 3-(diphenyl- phosphino)propanamide is discussed. In complex [PdCl(LNC )(Ph2PCH2CH2C(O)NH2-κP)] (compound 2) the phosphinoamide 1 exhibits P-monodentate coordination, whereas in the cationic complex [Pd(LNC )(Ph2PCH2CH2C(O)NH2-κ2 O,P)]ClO4 (compound 3) it binds as a P,O-chelating bidentate ligand. (LNC = 2-[(dimethylamino-κN)methyl]phenyl-κC1 ). 1 2 3 The ligand was synthesized by base-catalysed addition of diphenylphosphine across the double bond of acrylamide. Both complexes were prepared from [PdCl(LNC )]2 as metal precursor. All substances were characterised by common analytical methods, specifically by NMR spectroscopy, mass spectrometry, infrared spectroscopy and elemental analysis. Crystals of both complexes were obtained and their crystal structure was determined using X-ray crystallography.
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Time going to the work and work injuries
ŘEŽÁBKOVÁ, Jana
Commuting is regular travelling between one?s place of residence and the place of work. A lot of us surely remember our grandmothers and grandfathers talking keenly how they used to go to work to a farm, weaving factory, distillery and further facilities. It used to be usual that people had jobs at distances they could walk. On the other hand nowadays it is quite normal that some people have their places of work tens of kilometres from their homes and they have to commute by various means of transport, get up early in the morning and return late in the evening. Technical evolution has made transport faster but it also brought longer distances to travel to work. Commuting is particularly necessary at places with imbalance between supply of and demand for jobs. About one third of inhabitants commute in the Czech Republic and the travel costs represent approximately ten per cent of family budgets. People that spend more time travelling to work are wrong tempered, they are tired and stressed by commuting and occupational accidents occur as a subsequence of these factors. The aim of the Thesis ??Commuting time and workplace accidents?q was to discover what the average commuting time was and whether commuting affected the health condition of a human. Another aim was to find out how frequent workplace accidents were and how consistent employees were in reporting workplace accidents. 5 hypotheses were set to reach the aim. A quantitative method of questionnaire survey was applied on the research; the data were collected from commuting employees of a health facility, a school and a manufacturing company and compared. The data analyses did not prove that commuting caused health problems, so the hypothesis No. 1 was refuted. The second hypothesis suggesting that people from villages spend more time commuting than those living in towns was confirmed. Another hypothesis that each employee has suffered from a workplace accident was on the other hand refuted. The fourth hypothesis suggesting that fatigue, bad concentration, insomnia as a subsequence of commutation cause workplace accidents was also refuted. The last hypothesis suggesting that employees often do not inform their employers on their workplace accidents was also refuted. The Bachelor Thesis may improve knowledge of the time spent by commuting to work and subsequent occurrence of workplace accidents. The manual designed proposes preventive measures against workplace accidents and brings information in this field.
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