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Implementation of ISMS in a Company
Pospíchal, Jindřich ; Jordán, Vilém (referee) ; Sedlák, Petr (advisor)
The master’s thesis is aimed at proposing an implementation of information security management system in a company. It covers basic theoretical background and concepts of information system security and describes standards of ČSN ISO/IEC 27000. Specific provisioning of ISMS is then proposed based on the theoretical background and analysis of current state.
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The Implementation of ISMS in a Small Company
Svoboda, Milan ; Vlastimil,, Svoboda (referee) ; Sedlák, Petr (advisor)
The diploma thesis focuses on proposing an information security management system (ISMS) in a small company. This publication includes theoretical facts, which are needed to understand and design a ISMS. The design proposal of the ISMS itself is based on an analysis of the current status of the company's information security. The proposed security measures are based on the actual state of information security within the company, and on recommendations stemming from the ISO/IEC 27000 standard.
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Implementation of Information Security in the Enterprise
Veselý, Marek ; Jan,, Novák (referee) ; Sedlák, Petr (advisor)
This Master’s thesis is focused on the implementation of information security management system in the enterprise according to the standard ISO/IEC 27 001. The first part contains theoretical background of the information security, the second part focuses on current state analysis and the third part deals with suggestions for improvement current information security.
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Proposal for a new system of continuous quality measurement pairs
Foltová, Anežka ; Sedlák, Petr (referee) ; Holcman, Vladimír (advisor)
This paper deals with proposal of new continual system for quality measurement of sterilization steam. At the begining the process of sterilization is introduced. Then the concept of saturated streams, parameters for sterilization and sensors for measurement are described. Then the current process of measurement of steam quality is described and in the last part the proposal of the new system is introduced. After the draft was the measurement data, analysis and evalution.
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Experimental setup for measurements of temperature dependecies
Riško, Miroslav ; Sedlák, Petr (referee) ; Majzner, Jiří (advisor)
The goal is to build an experimental setup for the measurements of temperature dependencies of the electrical and noise characteristics of PZT ceramic samples and QCM sensors. The functional older cryostat was used as central part and the experimental setup was completed using instruments for temperature and vacuum measurements and DC power supply. The software for the setup control was programed in Matlab enviroment.
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Estimation of equivalent circuit parameters of a piezoelectric resonator
Ryšavý, Lukáš ; Majzner, Jiří (referee) ; Sedlák, Petr (advisor)
In this thesis, a simple measurement setup including control software is designed to estimate the parameters of Mason electrical equivalent circuit for piezoelectric resonators. Direct measurements can evaluate variables, such as mechanical quality factor, parallel resonance, serial resonance and serial resistance. These variables are used to estimate remaining parameters. The software is implemented in C++ Builder. Experimental study and verification were carried out on several quartz crystal and piezoceramic samples. The measurements are in good agreement with simulations as it is illustrated by a low value of relative error. The measurement setup will be used for scientific purposes of Dept. of physics FEEC BUT.
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Measurement of Parameters of Piezoelectric Active Elements for Acoustic Emission Sensors
Fialka, Jiří ; Erhart,, Jiří (referee) ; Sedlák, Petr (referee) ; Beneš, Petr (advisor)
The doctoral thesis discusses the measurement of parameters of piezoelectric (PZT) materials and the influence of temperature on their stability. In the introductory sections, the author briefly explains the piezoelectric effect and its use; simultaneously, methods for the preparation of piezoelectric materials and the measurement of their properties are presented to illustrate the analyzed problem. The experimental part of the thesis describes the procedure of measuring and calculating the complete matrix of material coefficients from samples of PZT ceramics. The applied set of piezoelectric samples complying with relevant European and world standards was made in the form of thin plates, thin discs and cylinders, via gradual modification of the large disc. The NCE51 and/or the older PCM51 ceramics obtained from the company Noliac Ceramics were used in determining the complete matrix and describing the measurement method. Both these types are soft piezoceramics composed from a solid solution of lead zirconate and lead titanate with the general chemical formula of Pb(Zr1-x,Tix)O3. The real crystallographic structure and chemical composition of the samples were confirmed by X-ray diffraction spectroscopy and energy dispersive spectroscopy (EDS), respectively. The frequency method was used for the measurement and calculation of all material coefficients. An Agilent 4294A impedance analyzer and a set of measuring tweezers marketed as “Tweezers Contact Test Fixture 16334A” were used in the process. Fast determination of the entire matrix of coefficients without any special requirement for the preparation of the samples to be measured was tested and verified. The charge coefficients of the piezoelectric material were confirmed by direct methods including the laser interferometer technique, the vibrometric method, and the procedure utilizing changes of the force applied to the sample. The advantages and disadvantages of the methods were compared and defined based on measurements and their results. The main part of thesis was focused on the behavior of piezoelectric material at high temperatures near the Curie point. Depolarization performed by means of a high temperature approaching the Curie point constitutes a significant yet hardly measurable material property of PZT ceramics. Commonly available vibrometric methods (d33-meters) do not appear to be suitable for the measurement of temperature dependencies, and for that reason the frequency technique was used. The piezoelectric charge coefficient, whose value can be effectively measured via the above-discussed frequency method, was selected as the indicator showing the depolarization state in the applied piezoelectric ceramics. The accuracy of the procedure was verified via comparison of the vibrometric method in cylinders of the NCE51 ceramics with different sizes, which are designed for the longitudinal length mode. The result is an optimized measurement methodology which facilitates accurate determination of the Curie temperature, namely phase transition to the cubic crystallographic structure. The experiment also proved the applicability of progressive, controlled depolarization of PZT ceramics via high temperature, and it also enabled us to define the temperature limits at which there occur irreversible changes of the piezoelectric properties of piezoceramics. In the measured NCE51 and PCM51 materials, the limit for the irreversible changes was equal to 95% of the Curie temperature.
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Static analysis of one joint of timber structure
Sedlák, Petr ; Gratza, Roman (referee) ; Kytýr, Jiří (advisor)
This diploma thesis deals with the numerical modeling of the nail joint of the timber roof structure and it is based on the already realized physical experiment. Totally twelve various solutions, where the isotropic and ortotropic characteristics of the spruce timber and steel components change, have been created. The final values of the joint shift obtained by using of the numerical modeling are compared with results of physical experiment. Program system ANSYS is used.
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