National Repository of Grey Literature
Not a member yet
574846 research outputs found
Sort by
Optimization of Lightning Protection System
No full textThis thesis focuses on the implementation, testing, and optimization of the Rolling Sphere Method used for designing Lightning Protection Systems in the MATLAB environment using the NSGA-III algorithm. The Rolling Sphere Method is considered the most universal approach for determining protection against direct lightning strikes. NSGA-III is a multi-objective evolutionary algorithm designed to solve multi-objective optimization problems. The thesis describes the developed program including its functions for calculating the centres of rolling spheres, calculating the distances of the spheres to the building and optimizing the problem using the NSGA-III multi-objective algorithm. The outcome of the thesis includes simulations on test scenarios involving simple building shapes, confirming the correct functionality and efficiency of the optimized method
Applications of Remote Sensing in Hydrology
No full textThis bachelor's thesis focuses on the use of remote sensing methods for monitoring hydrological phenomena in the Morava River basin. The aim is to analyze available data sources such as CHIRPS, MODIS, and HydroSHEDS, and to assess their applicability for spatial evaluation of hydrological variables using tools like Google Earth Engine and ArcMap
CT phantom for quantitative calcium analysis
No full textThis thesis deals with the design, manufacture and testing of a CT phantoms intended for quantitative analysis of calcium content, a key parameter in the diagnosis and monitoring of bone diseases progression. The work includes a review of methods for measuring bone mineral density BMD, an overview of commercially available phantoms, the design and implementation of a prototype phantom, and subsequently an improved second generation. The manufactured phantoms were scanned using an available CT system and then analyzed with a focus on their homogeneity and temporal stability. The results showed a high degree of homogeneity and long-term temporal stability, confirming that the phantoms are suitable for quantifying calcium concentrations. The proposed phantoms thus represent an affordable and effective alternative to commercial phantoms
Fluorescent probes for the investigation of photocatalytic reactions kinetics
No full textThis bachelor thesis focuses on the behavior of resazurin as a fluorescent probe for monitoring the kinetics of photocatalytic reactions. Four types of catalysts were tested: WO3, TiO2 (in suspension and as an immobilized layer), and g-C3N4. The influence of various factors was investigated, including catalyst concentration, light intensity, glycerol addition, and pH. The results show that the probe is suitable for systems using TiO2 and g-C3N4, although its applicability depends on environmental parameters such as pH, catalyst form, and ambient lighting conditions
Bayesian Motion Estimation in Arterial and Cardiac Ultrasound Sequences
No full textUltrazvukové vyšetření je běžně používaná neinvazivní technika pro hodnocení zdraví kardiovaskulárního systému. Analýza pohybu kardiovaskulárních struktur může poskytnout cenné informace pro diagnostiku kardiovaskulárních onemocnění. V této práci se zaměřujeme na vývoj nových bayesovských metod pro odhad pohybu v ultrazvukových sekvencích krkavice a srdce. V první části práce se zaměřujeme na ultrazvukové sekvence zobrazující příčný řez krkavicí. Zde navrhujeme novou metodu pro lokalizaci tepenné stěny krkavice a dvě nové metody pro odhad jejího pohybu. Tyto dvě metody jsou inicializovány právě výsledkem lokalizace. Navrhovaná metoda lokalizace, na rozdíl od těch stávajících, nespoléhá na výpočet gradientu v obraze, který je v ultrazvukových snímcích kontaminovaných šumem a ultrazvukovými artefakty nepřesný. Experiment provedený na 145 reálných ultrazvukových snímcích s ručně vymezenou stěnou krkavice ukazuje, že navrhovaná metoda překonává nejlepší stávající metodu v přesnosti lokalizace. První metoda pro odhad pohybu je založena na sledování sady referenčních bodů (RB), které jsou ve snímku umístěny v blízkosti tepenné stěny. Pro tento účel používáme upravenou verzi známého algoritmu pro sledování více objektů, tzv. joint integrated probabilistic data association algorithm. Ačkoli tato metoda překonává nejlepší stávající metodu na syntetických ultrazvukových sekvencích, má určitá omezení. Metoda nemusí vždy uspět při identifikaci dostatečného počtu RB v blízkosti tepenné stěny, a navíc předpokládá konstantní srdeční frekvenci. Tato omezení jsou řešena ve druhé navrhované metodě. Zde mohou být RB umístěny kdekoli podél tepenné stěny a srdeční frekvence může být časově proměnná. Polohy RB, parametry tepenné stěny a srdeční frekvence jsou zde trasovány pomocí varianty Kalmanova filtru, tzv. unscented Kalman filter. Rozsáhlé experimenty na několika syntetických ultrazvukových sekvencích ukazují, že tato metoda překonává nejlepší stávající i předchozí navrženou metodu v přesnosti odhadu. Experiment na skutečné ultrazvukové sekvenci navíc dokládá její praktickou použitelnost. Ve druhé části práce se zaměřujeme na ultrazvukové sekvence zachycující srdce. Zde navrhujeme nový bayesovský framework a metody pro odhad optického toku, které umožňují efektivní využití statistického modelu snímků v dané modalitě a vyčíslení nejistoty výsledného odhadu. Numerické experimenty na syntetických srdečních ultrazvukových sekvencích potvrzují, že využití znalosti o statistickém modelu ultrazvukových snímků má pozitivní vliv na přesnost odhadu. Zároveň pak ukazují, že navrhované metody překonávají nejlepší stávající metody v přesnosti odhadu
Tools for penetration testing of wireless networks
No full textThis master's thesis deals with the design and implementation of tools for penetration testing of wireless networks utilizing WPA3 security and the EAP authentication protocol. The thesis presents a custom testing methodology and describes the development of an experimental testing environment that simulates real-world operational scenarios. The outcome of the work is a set of six support tools written in Python, whose functionality has been successfully validated within the described environment. These tools are ready for integration into the Penterep platform and provide output in JSON format. The contribution of this work lies not only in the more efficient identification of security vulnerabilities in Wi-Fi networks but also in simplifying the workflow of penetration testers. Finally, the thesis outlines recommendations for the further development of these tools and explores their potential deployment in real-world conditions
Origin and propagation of rapid voltage changes and voltage events in the transmission system
No full textThis thesis deals with the analysis of the propagation of rapid voltage changes and voltage events in the transmission system of the Czech Republic. It presents the principles of the occurrence of these disturbances and describes their propagation in the power system. Furthermore, it provides a detailed analysis of the propagation of these phenomena using a test section of the transmission system modeled in the PSCAD program, based on real parameters. The simulation results offer a deeper understanding of how these phenomena spread within the network. The thesis also highlights several factors that system operators should consider when assessing such disruptive events
Model of an Industrial Enterprise Electrical Network in Etap
No full textIn modern industrial plants, reliable power systems are crucial for continuous operation and productivity. The complexity of these systems requires advanced tools for analysis, simulation and optimization. In this thesis, a detailed model of an industrial plant’s electrical grid is developed using ETAP (Electrical Transient Analyzer Program), a software platform for the design, analysis, and optimization of electrical power systems. The objective of this work is to simulate existing network of an industrial plant and use the model to perform sizing control calculations and connection studies of integrating new loads or resources. By sticking to the standard study criteria, it will be ensured that the electrical network is robust, efficient and able to accommodate future expansion without compromising safety or operational reliability. The outputs from the ETAP tool will be analyzed and recommendations will be made based on these analyses to ensure compliance with the industry standards
Air Conditioning Design of a Small Boarding House
No full textThis bachelor thesis focuses on the design of ventilation systems in a small guesthouse. The work is divided into three main sections. The first section is theoretical and addresses the use of Buil-ding Information Modeling (BIM) in the design of ventilation systems, its advantages, and the future application of this technology. The second section is computational and focuses on the design of ventilation units for three functional units. Specifically, it involves the design of ventila-tion for the kitchen, bar, restaurant, and residential area. The third section consists of the project documentation
Design and Assessment of a Timber Roof Structure for a Family House
No full textThe subject of the bachelor’s thesis is design of a load-bearing timber structure for second floor of a family house located in area of Jakubčovice and creation of a 3D model using the BIM method. The building is considered to be two story without a basement. The first floor consists of classic brick structures with reinforce concrete ceilings. The load-bearing system of the second floor is a transverse frame structure consisting of beams and columns with longitudinal reinforcing elements and transverse stiffeners. The roof structure slope is considered to be 35°. The static model and internal forces were determined using the REFM 6 program, but the analysis of the elements was performed by hand in the MS Execel program. The joints of the timber structure are designed as pin joints with inserted sheets. The architectural and structural solution was created in collaboration with colleague from the PST institute