|
|
Exploring correlation between vegetation indices and plant nitrogen uptake
Pavlačková, Alena ; Doležalová Weissmannová, Helena (referee) ; Kučerík, Jiří (advisor)
Nadměrné hnojení může způsobit znečištění životního prostředí, jako je kontaminace vody a emise skleníkových plynů, a také ekonomické ztráty. Ke zmírnění těchto problémů je důležité přizpůsobit míru hnojení specifickým potřebám plodin. Ve své práci se zabývám možností využití dálkově snímaných vegetačních indexů pro monitorování příjmu dusíku rostlinami a řízení aplikace hnojiv. Měření byla provedena v Oensingenu, Švýcarsku, během stáže na ETH Zürich. Hlavním cílem bylo vyvinout predikční model založený na vegetačních indexech k odhadu příjmu dusíku travní směsi a ozimé pšenice. Dále byla analyzována korelace mezi různými vegetačními indexy a charakteristikami plodin, především příjmu dusíku. Vegetační indexy (NDVI, NDRE, GNDVI, MCARI, EVI) byly získány ze snímků družice Sentinel-2 pomocí Google Earth Engine. Byly změřeny různé charakteristiky plodin, včetně indexu listové plochy (LAI) a výšky plodin, a vzorky ozimé pšenice byly analyzovány na příjem dusíku pomocí elementárního analyzátoru. Do analýzy byla také zahrnuta další data týkající se příjmu dusíku travin z předchozích let. Celkem byla v analýze použita data z let 2021–2023, která zahrnovala hodnoty pro travní směs i ozimou pšenici. Byly provedeny korelační a regresní analýzy k určení vztahů mezi vegetačními indexy a měřenými charakteristikami plodin. Index, který vykazoval nejsilnější vztah s příjmem dusíku plodin, byl poté využit k vytvoření predikčního modelu. Analýza ukázala, že Enhanced Vegetation Index (EVI) byl nejúčinnějším prediktorem příjmu dusíku. Vytvořený predikční model založený na hodnotách EVI dosáhl vysokého koeficientu determinace (R$^2$) 0,89, nízké směrodatné odchylky chyb (RMSE) 1,05 a průměrné absolutní odchylky (MAE) 0,89. Výsledky naznačují, že EVI je spolehlivým indexem pro predikci příjmu dusíku plodinami. Vyvinutý model založený na EVI by mohl být potenciálně použit k optimalizaci aplikace dusíkatých hnojiv na plodiny, což by pomohlo snížit negativní environmentální a ekonomické dopady nadměrného hnojení.
|
|
|
Human Hand Geometric Parameters Measurement Using Numerical Methods of Image Processing
Vanžurová, Anna ; Procházková, Jana (referee) ; Štarha, Pavel (advisor)
This thesis deals with a matematic model used for estimation of the surface of a human hand. By using the theory for digital image processing, analytic geometry and numerical methods a model for proccesing a photografy of a hand was created. This model further calculates the surface in the software Matlab. The model uses tools such as median filter, adaptive tresholding or conditional erosion. Interesting is the usage of the curvature of a curve, which can be used to find the peaks and bases on the border of the hand. Dependencies between the calculated results and the measured real surfaces can be found. Therefore a regression function could be found, which gives us a point estimation of the human hand surface.
|
|
| |
|
|
Analysis of economic data using statistical methods
Halámka, Jaroslav ; Novotná, Veronika (referee) ; Michalíková, Eva (advisor)
My bachelor thesis deals with the application of financial analysis and statistical methods to selected company. The thesis is divided into three parts. The first part deals with theoretical characteristics of concepts, indicators and methods used throughout this thesis. The second part is focused on the analysis itself and deals with the evaluation of the current state of the company and the third part is focused on providing additional recommendations for future improvement.
|
|
|
Analysis of hysteresis behavior of vertical headlight adjustment in an automobile
Holec, Radek ; Hadač, Ondřej (referee) ; Vosynek, Petr (advisor)
The thesis deals with the occurrence of mechanical hysteresis in the vertical adjustment mechanism of car headlights. The adjustment mechanism contains certain inaccuracies that can result in mechanical hysteresis, a phenomenon in which the light source does not return to its original position and the direction of the light rays is deviated from the intended direction. The first part of the paper deals with contacts and friction in the connectors in the Abaqus software. Then the development of the computational model is described. This model is further compared with the measured values of the actual headlamp. A DOE (Design of Experiment) was performed and these results were processed using regression and sensitivity analysis. The effect of clearances and high friction moments was found to be the most significant. The paper concludes by describing the principles by which hysteresis arises and quantifying the various parameters that affect hysteresis.
|
|
|
Retail electricity price analysis
Chmelař, Šimon ; Zinecker, Marek (referee) ; Radil, Lukáš (advisor)
This thesis focuses on the analysis of electricity retail prices within the Czech Republic. In recent years, spot electricity prices have become a significant topic due to their high volatility, which was caused by market liberalization, geopolitical factors, and the gradual transition to sustainable energy sources. The aim of this work is to create a computational model for estimating the composition of various types of wholesale prices from the retail prices offered by electricity suppliers. The first part of the thesis summarizes the functioning of the wholesale electricity market, its components, and the types of electricity trading. The second part of the thesis focuses on compiling calculations using MATLAB software. By analyzing wholesale prices and prices offered by a certain supplier, it determines whether the supplier has secured at least the minimum part of the estimated consumption of its customers and is thus able to fulfill its obligations.
|
|
|
Assessing Economic Situation of a Company and Proposals for Its Improvement
Sachambula, Nelson Mendonca ; Měrtlová,, Libuše (referee) ; Doubravský, Karel (advisor)
This diploma thesis focuses on the assessment of the economic situation of XYZ Med s.r.o. for the period from 2013 to 2022. The economic situation of the company is evaluated on the basis of selected financial indicators, which are then subjected to statistical analysis in order to create a basis for the proposal of measures to improve the situation. The theoretical part describes the financial ratios, correlation analysis, regression analysis and time series. In the analytical part of the thesis, the calculation of financial ratios is performed and then a statistical analysis is carried out on the basis of which the future development of the company is predicted. The analysis also tests the dependence for selected ratios. The practical part contains suggestions for improving the economic situation of the company.
|
|
|
Determinants of Economic Development in Estonia, Latvia, Lithuania and the Czech Republic
Gonsior, Martin ; Zinecker, Marek (referee) ; Luňáček, Jiří (advisor)
This master thesis focuses on uncovering the determinants of growth in Estonia, Latvia, Lithuania and the Czech Republic. The thesis is divided into a theoretical basis, which is devoted to economic growth and the determinants that can affect it, and an analytical part, where the dependence of selected determinants on economic growth is examined. The results of the individual analyses are compared with each other. At the end of this thesis, the results are discussed and recommendations are formulated for the top institutions of the selected countries.
|
|
|
Analysis of price-setting factors of rent for appartments in Brno
Jesenská, Mária Ľudmila ; Cupal, Martin (referee) ; Vařechová, Martina (advisor)
This master's thesis focuses on a comprehensive analysis of the real estate market in the area of apartment rentals in Brno, with an emphasis on determining the price-setting factors affecting rental prices and their significant role in setting the rent. The research employs a rigorous methodology and multiple regression analysis to examine the relationships between various variables and rental prices. The aim is to uncover patterns and trends in rental prices across different parts of the city of Brno and provide a detailed insight into the functioning of the real estate market. At the beginning of the research, an extensive dataset of rental apartments is compiled, containing important information about location, floor area, apartment layout, and the structural and technical condition of the apartments. These data will serve as a foundation for a detailed analysis and the identification of patterns and trends in rental prices and the determining factors influencing them.
|
|
|
Analysis of Economic Indicators Using Statistical Methods
Picka, Václav ; Vaníček, Jiří (referee) ; Doubravský, Karel (advisor)
The thesis is focused on the analysis of economic indicators of Brno Transport Company, Inc. using statistical methods. The issue of time series, regression analysis and selected economic indicators is illustrated in the theoretical part. In the practical part the indicators will be analyzed using time series and regression analysis associated with their predictions for the future. The last part contains recommendations for possible determination of strategies and business objectives.
|
guest ::
