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Proposal of Competitive Strategy of Company
Števanka, Ladislav ; Raška, Michal (referee) ; Zich, Robert (advisor)
This Master’s thesis analyses the current status of the small selling company, which sells sport articles. The thesis investigates impact extenrnal environment on the firm and also analyse internal environment. It defines strategic targets, contains propsal of competitive strategy of the company and its time implementation.
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Analysis transport system in primary agricultural production
Raška, Michal ; Kubín, Karel (referee) ; Kašpárek, Jaroslav (advisor)
This thesis presents a comparison of fuel consumption and transportation efficiency of various transport vehicles in primary agricultural production. The first part deals with the possibility of transport of materials in agriculture. The following is a description of the compared vehicles. Finally, it describes the methodology of calculation of fuel consumption vehicles, which are then compared.
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Noise diagnostics of rectifier diodes PN junctions
Klimíček, Jaromír ; Macků, Robert (referee) ; Raška, Michal (advisor)
The thesis deals with the design of the measurement installation, which is intended for the microplasma noise measurements. This noise is being generated in the defective parts of the PN junction. The goal of this work is to design the measurement installation and to realize the fully functional workbench for the analogical noise related measurements and to determine the transfer function of the measurement installation. Main part of the work is to choose proper parameters for the measuring devices and to design the software intended for the automated measurements. Consequently, we have to process the measured waveforms of the microplasma noise, to determine the dependency of the noise on the signal magnitude and to calculate the power spectral noise density. Finally, we have to determine the transfer function of the measurement installation and to design the inversion filter.
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Microplasma Noise as a Diagnostic Tool for PN Junctions of High-Voltage Rectifier Diodes
Raška, Michal ; Chobola, Zdeněk (referee) ; Hájek, Karel (referee) ; Koktavý, Pavel (advisor)
The doctoral thesis deals with diagnostics of local defects in PN junctions and brings new information about microplasma noise behaviour and its usage for the temperature changes detection inside PN junctions. Defects in PN junctions are the source of microplasma noise. There were deviations observed in microplasma noise from the common known rectangle shape pulses during the measurements. These deviations were correlated with the temperature change directly in the defect area and in the defect area surroundings. Generation and recombination coefficients are commonly thought to be constant. However, these coefficients were observed to be not stable with time and this effect is explained in this work. The doctoral thesis then focuses on the PN junction parameters determination in the case when it is not possible to define unambiguously whether it is abrupt or linearly graded PN junction. The most significant parameters which are to be determined are barrier capacity, diffusion voltage and depleted area width in dependence on the voltage. The correlation between local avalanche discharge in PN junction and negative differential resistance appearance on VA characteristics of reverse-biased diode was qualitatively verified. The last important point in the work is computer modelling of temperature behaviour in the defect area and its surroundings during local avalanche breakdown. Thus the method of real diodes heating area parameters determination was introduced.
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Application of radiation emitted from local areas of PN junction for solar cell diagnostics
Krčál, Ondřej ; Raška, Michal (referee) ; Macků, Robert (advisor)
The microplasma discharges in the PN junction local defect micro-regions are as a rule, accompanied by the emission of light. This radiation from solar cell PN junctions was measured by means of a optical fibre connected to the optical input of a photomultiplier. By inching the fibre by means of computercontrolled X-Y plotter above the cell surface a 2-D image of the irradiation local regions has been created. It is seen that a cell of a superficial area of 100 square cm contains a large number of defects, which depends on applied reverse voltage. This method can be a convenient tool for study and diagnostics of optoelectronic devices.
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Optimization of Storage and Transport Processes in the Business Firm
Švejda, Jakub ; Raška, Michal (referee) ; Videcká, Zdeňka (advisor)
This master thesis deals with optimization of storage and transportation processes in the business firm K-elektric, s.r.o.. In the beginning of the thesis I focused on defining logistics and goals of the thesis. The first chapter is about the main processes and conceptions. The second part describes teoretical solution which could show proper way of the solution of suggestion. The third chapter is about characterization and analysis of the firm and surroundings. The fourth chapter dafines problems. The fifth chapter is devoted to suggestion of the solution for optimization. The conclusion of the thesis deals with evaluation of the suggestion. The reader of this master project will gain the basic informations about the logistics in business activity and information about this firm, processes in the storage and transport and will be familiarized with optimization of these processes.
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Framework for Customizable Autopilot Solutions
Raška, Michal ; Zavoral, Filip (advisor) ; Kruliš, Martin (referee)
The thesis analyses, designs and implements the framework for creation of customizable autopilot solutions for radio controlled airplanes. As a proof of concept of this framework a set of applications, which use this framework, is cre- ated. The result of this thesis is the extensible modular system, capable of airplane's attitude control, telemetry transmission and wireless communication with the ground station. There is great diversity in the components used by the system, which must be hidden by the framework. The differences must be encased in order to deliver required user experience for the programmers using the frame- work and the end users of the resulting applications as well. The tests, which validate the goals of the thesis indicate, that the resulting system is capable of all required tasks and ready to implement additional features which the end users might require in the future. 1
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Microplasma Noise as a Diagnostic Tool for PN Junctions of High-Voltage Rectifier Diodes
Raška, Michal ; Chobola, Zdeněk (referee) ; Hájek, Karel (referee) ; Koktavý, Pavel (advisor)
The doctoral thesis deals with diagnostics of local defects in PN junctions and brings new information about microplasma noise behaviour and its usage for the temperature changes detection inside PN junctions. Defects in PN junctions are the source of microplasma noise. There were deviations observed in microplasma noise from the common known rectangle shape pulses during the measurements. These deviations were correlated with the temperature change directly in the defect area and in the defect area surroundings. Generation and recombination coefficients are commonly thought to be constant. However, these coefficients were observed to be not stable with time and this effect is explained in this work. The doctoral thesis then focuses on the PN junction parameters determination in the case when it is not possible to define unambiguously whether it is abrupt or linearly graded PN junction. The most significant parameters which are to be determined are barrier capacity, diffusion voltage and depleted area width in dependence on the voltage. The correlation between local avalanche discharge in PN junction and negative differential resistance appearance on VA characteristics of reverse-biased diode was qualitatively verified. The last important point in the work is computer modelling of temperature behaviour in the defect area and its surroundings during local avalanche breakdown. Thus the method of real diodes heating area parameters determination was introduced.
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