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LTE system models
Navrátil, Petr ; Masopust, Jiří (referee) ; Hanus, Stanislav (advisor)
Master’s thesis is focused on part of mobile network named LTE. Project is analyzes the LTE physical layer, which is divided into four basic parts: Physical channels and modulation, Multiplexing and channel coding, Physical layer procedures, Physical layer measurements. Every part is described by actual 3GPP standard [1]. To understand the problem is expected a reader basic knowledge of OFDM systems, which the LTE system uses. The next part of this master’s thesis is dedicated to mathematic model physical layer of system LTE, created by program Matlab. This model is designed to measure errors in data transmission.
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Support for education of biometric access systems
Navrátil, Petr ; Herencsár, Norbert (referee) ; Burda, Karel (advisor)
This thesis describes general function of biometric access systems and summarizes problems of their practical use. It also shows security risks of these systems. It defines basic terms, which are used in this area, describes kinds of errors and their representation. One part of this thesis deals with biometric method of fingerprints recognition. It explains fingerprints’ atomic basics, basic principles and processing of digital fingerprint image. Next part describes concrete biometric access system V-Station by Bioscrypt Inc. Besides basic description it focuses on technology of biometric sensor and algorithm, essential parts of biometric system. The thesis continues with security analysis of this concrete system. In this part I target on weak points of the system and I design possible attack on the system. In the last part of my thesis I designed laboratory exercise, which is supposed to be realized by student. It is composed it by several tasks to let students understand working with the system and attached software. At the same time, they have opportunity to think about system by themselves a make their own opinion about possibilities of the system. There are many pictures in this thesis to make term clear and to better understanding of problems of biometric security systems.
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Homogenization of closed foam structures using Kelvin cell
Škoviera, Jozef ; Navrátil, Petr (referee) ; Skalka, Petr (advisor)
The bachelor‘s thesis deals with creating calculation model of the foam structure based on Kelvin cell with closed porosity. First aim of this work is homogenization of the foam structure by identical deformation response in foam structure and continuum. Second aim is follow-up parametrical study of influence of characteristic measures of Kelvin cell on material characteristics. Task was solved in ANSYS software by method of final elements. Resultant dependences rendering was done in MATLAB software.
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Homogenization of open foam structures using Kelvin cell
Barančík, Milan ; Navrátil, Petr (referee) ; Skalka, Petr (advisor)
The bachelor thesis deals with homogenization of open foam structures using Kelvin cell. A computational model of the foam structure was created and converted into a computational model of solid with corresponding material characteristics in ANSYS software. Subsequently, a parametric study of the effect of Kelvin cell proportions on solid material characteristics was done. The output of the study was a generalization of the dependence of solid material characteristics on Kelvin cell proportions. Lastly, the suitability of the generalization was verified and achievements were evaluated.
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Application of activated carbon in flue gas treatment process
Navrátil, Petr ; Niesner, Jakub (referee) ; Jedlička, Filip (advisor)
The objective of this bachelor thesis is to explain the problematic of flue gas treatment from the air pollutants mainly by methods using adsorption on activated carbon. There is an introduction to environmental protection, description of selected chemicals, charcoal and description of technologies to remove pollutants in municipal waste incinerators, and finally mention the possibilities of disposal or reuse of a saturated carbon. And finally selection of appropriate methods and design for a specific application.
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Application of activated carbon in flue gas treatment process
Navrátil, Petr ; Niesner, Jakub (referee) ; Jedlička, Filip (advisor)
The objective of this bachelor thesis is to explain the problematic of flue gas treatment from the air pollutants mainly by methods using adsorption on activated carbon. There is an introduction to environmental protection, description of selected chemicals, charcoal and description of technologies to remove pollutants in municipal waste incinerators, and finally mention the possibilities of disposal or reuse of a saturated carbon. And finally selection of appropriate methods and design for a specific application.
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Optimalization of the flow of material in a pressing line at Siemens Electric Machines company
Hruška, Jindřich ; Navrátil, Petr (referee) ; Kubík, Roman (advisor)
This thesis deals the optimalization flow of material in the press lines in company Siemens Electric Machines s.r.o. The thesis begins with theory of the flow of material and the Kanban method. After that thesis describe the issues which the company contend. In the next chapters the thesis The work contains general requirements for the assignment and optimization required by management and proposed possible solutions for optimizing material flow in the company. In the following chapters thesis solve the realisation of the chosen variant, for which Siemens Electric Machines to decided and the costs associated with implementation.
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Stress - strain analysis of bridge structure during the train passage
Kolárik, Matej ; Navrátil, Petr (referee) ; Skalka, Petr (advisor)
The bachelor’s thesis concerns the stress-strain determination of the rail bridge in Komárov during the train crossing. The task was solved in the program ANSYS which uses the finite element analysis. The following factors were taken into consideration: a non-loaded state, the state of a train assembly load, and detailed observation of a continual crossing of diesel train. Following the series of results the most dangerous state was defined and the safety calculated.
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Stress-strain analysis of clamping mechanism element
Gergeľ, Erik ; Navrátil, Petr (referee) ; Skalka, Petr (advisor)
The bachelor thesis deals with creation of computational model and solves Stressstrain analysis of a car window clamping mechanism element. The main focus of thesis is to locate a critical area of part and find out the distribution of stress is this area. FEA system ANSYS was used for this analysis. The shape optimization based on results of FEA was successful. The equivalent stress was significantly lowered. It would be able to increase the operating time of clamping element.
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