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Frequency-to-Voltage Converter
Šindelář, Michal ; Bejček, Ludvík (referee) ; Beneš, Petr (advisor)
This bachelor’s thesis deals with the issue of the transfer frequency to voltage focusing on dynamics and accuracy. The goal of this thesis is the design and implementation of the converter based on the input arguments. The graph evaluates the tradeoff between dynamics and accuracy. It is possible to choose a more suitable solution to transfer frequency to voltage for the specified requirements.
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Confirmation of temperature chamber and determination of measurement uncertainty
Beníšek, Ondřej ; Šindelář, Michal (referee) ; Šedivá, Soňa (advisor)
The master's thesis deals with the confirmation of temperature chambers, with the greatest emphasis on the determination of standard measurement uncertainty, both by the classical method (GUM) and the Monte Carlo method. It includes the design of a measuring system with data transfer to a computer using the USB communication interface and an analysis of the sources of uncertainty entering the system, which are then practically quantified. To obtain the data, a measuring experiment was carried out in the CVVOZE testing laboratory. The LabView program was used for virtual instrumentation, in which a measuring application was designed and created, which takes care of the collection and processing of measured data. The result of the application is, in addition to recording temperatures from all measured points in the chamber, also the standard uncertainty calculated by the GUM and Monte Carlo methods, including plotting a histogram from the results obtained by both methods in order to compare them. Finally, the achieved results are compared and evaluated.
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Calibration of angular encoder
Šindelář, Michal ; Klusáček, Stanislav (referee) ; Beneš, Petr (advisor)
This master’s thesis deals with calibration of incremental encoders. Introduces basic principles and terms in the field of rotary encoders and its calibration. The first part describes angular displacement sensors. Especially it focuses on optoelectrical incremental encoders. It also includes market research of very high-accuracy encoders. The second part contains description of precision calibration techniques with uncertainty to the thousandth of an arc-sec level. In the last part, the development of a calibration stage is presented and consequently the error map of an encoder is obtained.
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Calibration Of Precision Rotary Table Using Laser Interferometer System
Šindelář, Michal
Calibration of a rotary axis can be useful to determine angular deviations throughout themeasuring range. Specified accuracy presented in the specification list represents the worst case,therefore information about magnitudes of deviations of individual measuring points are unknown.The resulting error map of the device under test allows correction of the indicated value. As a result,the measurement accuracy of the device can be increased. Calibration of a precision rotary table wasperformed using a Keysight 5530 laser interferometer system. The presented paper briefly describesthe fundamentals of this portable calibrating system. Also, the results and accuracies are discussed.
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Shock Response Spectrum Testing With Shock Machine
Šindelář, Michal
Transient mechanical shocks cause dynamic stress in structures which results in defect or malfunction of exposed devices. A shock response spectrum (SRS) is used for characterizing an acceleration response of linear single degree of freedom system to these shocks. This paper is focused on presentation of the shock response spectrum derived from half-sine shock generated by shock machine.
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Confirmation of temperature chamber and determination of measurement uncertainty
Beníšek, Ondřej ; Šindelář, Michal (referee) ; Šedivá, Soňa (advisor)
The master's thesis deals with the confirmation of temperature chambers, with the greatest emphasis on the determination of standard measurement uncertainty, both by the classical method (GUM) and the Monte Carlo method. It includes the design of a measuring system with data transfer to a computer using the USB communication interface and an analysis of the sources of uncertainty entering the system, which are then practically quantified. To obtain the data, a measuring experiment was carried out in the CVVOZE testing laboratory. The LabView program was used for virtual instrumentation, in which a measuring application was designed and created, which takes care of the collection and processing of measured data. The result of the application is, in addition to recording temperatures from all measured points in the chamber, also the standard uncertainty calculated by the GUM and Monte Carlo methods, including plotting a histogram from the results obtained by both methods in order to compare them. Finally, the achieved results are compared and evaluated.
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Rotary Encoder Calibration
Šindelář, Michal
Manufacturer of an encoder gives an information about maximum error level of the measured position and the magnitude of the angle deviation for each single position is unknown. The calibration provides an error map which can be used for correction of actual measured angle value. Hence, the measurement accuracy for each position is significantly increased. Presented method provides on-axis self-calibration and does not require any external angle standard. It is based on the interpolation of correct angle position for each count of the encoder.
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The Analysis of Oligopolistic Structure on the Czech Audit Market
Šindelář, Michal ; Müllerová, Libuše (advisor) ; Králíček, Vladimír (referee) ; Vyleťalová, Květoslava (referee)
The dissertation thesis is processed in the form of a set of original and published articles with specific results from the methodologically or thematically related areas. The aim of the dissertation is to obtain information about the audit market in the Czech Republic from the point of view of oligopolistic structure and to compare the results with an international research in this area. The issue of the audit market was not a frequent subject of academic analyses in the Czech Republic, therefore the dissertation tries to fill this gap. The oligopolistic structure interferes audit in several risk areas. It threatens the independence of the auditor in the context of the simultaneous provision of audit and non-audit services. The existence of a high market concentration may also indicate negative impacts on the overall quality of the audits performed. The main contribution of the work lies in the analysis of the market concentration on the data of the Czech Republic. The dissertation as a whole analyses the Czech audit market between the years 2010-2015 and presents a view of academic research on market concentration in the Czech Republic. In terms of data source, the dissertation deals with areas of higher social importance, i.e. areas of public interest entities respectively listed companies, which is also typical for international research. Therefore, the conclusions of the dissertation cannot be generalized to the field of the audit market represented by companies that are not public interest entities. From the methodological point of view, the dissertation in its analytical part is based mainly on internationally recognized statistical methods for measuring market concentration, namely the concentration ratio and the Herfindahl-Hirschman index. The most important conclusion is the finding that there is a comparable level of market concentration in the Czech audit market with large audit markets. The analysis shows that Big 4 firms occupy approximately 85% of the audit market and this share remains unchanged between the years 2011-2014.
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Accounting frauds
Stančíková, Lucie ; Šindelář, Michal (advisor) ; Müllerová, Libuše (referee)
The main aim of barchelor thesis is to look at frauds in accounting. The first chapter tries to define the border between fraud and creative accounting and to highlight the main differences because these terms can be often mistaken. In the second chapter there are incentives that cause fraudulent behaviour. The third chapter elaborates various ways of frauds in accountancy which appear not only in financial statements but also out of them. The next chapter includes examples of real frauds committed in the Czech Republic as well as abroad. The conclusion looks at several ways of prevention which can help us fighting against frauds.
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