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Analysis of possible threats in old OS Linux version
Chovancová, Emília ; Dejdar, Petr (referee) ; Tomašov, Adrián (advisor)
The bachelor thesis is focused on the security aspect of an older version of a Linux based machine. The document is split into a theoretical part which contains a description of what operating system, kernel, UNIX, GNU/LINUX and Linux OS are in general. Then the description proceeds to explanation of active and passive attacks such as replay, masquarade, denial of service, man in the middle or listening and analysing the network. Afterwards it continues with description of potentially vulnerable spots that are common on operating systems. With the help provided from scanning software, especially Nmap and Lynis, the document proceeds to the practical part which contains various types of successful and unsuccesfful attacks such as password recovery, denial of service, spectre, brute force of a password and cross-site scripting. The last part covers the protection against succesfull attacks and adds a little bit more of additional protection in general in a form of an ansible script.
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Design of optical fiber sensor for vibration detection
Janoušek, Adam ; Münster, Petr (referee) ; Dejdar, Petr (advisor)
The master theses deals with a detailed analysis of optical fiber sensors. Specifically, there are discussed optical fibers, various types of sensors and realization optical fiber senzor and senzor system that has been optimized and processed data in real time. In master theses also describes the LabView programming enviroment and uses components, including the entire sensor systém of a sensors system that sends measured data
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Automatic table distillation column
Ružička, Michal ; Hanák, Pavel (referee) ; Dejdar, Petr (advisor)
The semester thesis deals with the issue of alcohol distillation and analysis for understanding at the level for construction of the facility itself. It deals with the requirements for the distillation equipment and parameters that may affect the quality of the distillate. On the basis of which is created automated control by microcontroller. This apparatus is exposed to tests and measurements of the required values during distillation. The cooling unit was also built and measured.
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Communication protocols emulator
Fabulec, Martin ; Dejdar, Petr (referee) ; Jablončík, Lukáš (advisor)
The content of this work is the analysis of commonly used serial protocols RS-232 and RS-485 and their transmission using the optical fiber. The work deals with the analysis of the actual problematic and the connection design of the optical fiber system, communication through optical fiber and communication interface. The design of the communication protocol emulator and the verification of the functionality of the transmission system are also discussed. The theoretical part deals with optical components such as optical receiver and transmitter, SFP module and the description of the RS-232 and RS-485 interface. The practical part mentions the connection proposal and subsequent data transfer.
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Leakage of information through existing fibre optic infrastructures inside buildings
Kyselova, Yuliia ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
The bachelor thesis deals with the possibilities of detecting acoustic and mechanical vibrations through existing optical data infrastructures inside buildings. The work includes a description about optical fiber and a theoretical analysis of the possibilities of implementing data distribution inside buildings, it also includes an analysis of methods for implementing optical fiber microphones. In the practical part of the work, the measurement was performed with an optical fiber microphone and then using an interferometer and a sensor based on the polarization method.
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Measurement of optical and opto-electrical components parameters
Horňáková, Veronika ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
This diploma thesis deals with optical and optoelectronic components. The first part describes three selected optical and three optoelectronic components. Optical components include power divider, isolator and circulator. The optoelectronic ones are laser diode, photodetector and modulator. Basic measurement parameters were defined for each component. In the experimental part, four components from different manufacturers were measured. Selected components are power dividers, isolators, circulators and a laser diode. Subsequently, the measured parameters were compared with the catalog values.
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Detection of acoustic vibrations using optical fibers
Skliar, Pavlo ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
This bachelor thesis examines the possibilities of utilization optical fiber acoustic sensors. Introduction part describes the basic principles of signal transmission in optical fiber and the interaction of acoustic waves with optical fiber. Operational principles of different types of optical fiber acoustic sensors are explained further in the text.The fiber Mach-Zehnder interferometer is described in detail in this work. The work is focused on the possibilities of utilization single point and distributed optical fiber acoustic sensors. In the practical part, measurements were performed using a commercial optical fiber microphone and an implemented fiber Mach-Zehnder interferometer connected to a polarimeter.
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Fiber optical transmission system
Horský, Tomáš ; Münster, Petr (referee) ; Dejdar, Petr (advisor)
Bachelor thesis deals with the program processing for the simulation of dispersion on the optical transmission. Parameters of optical fiber, such as attenuation, diffusion, dispersion, and bandwidth are described in the theoretical part. The main focus is on dispersion while being the key parameter of this work. In the practical part, the measurement characteristics of the eye diagram and its analysis are discussed. Simulator of dispersion can serve both for simulation as well as a measuring device for real transmission routes.
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Graphical user interface for sensing systems
Dejdar, Petr ; Vojtěch, Josef (referee) ; Münster, Petr (advisor)
Master thesis is focused on creating graphical user interface for the sensorical system based on Phase-OTDR. Theoretical part describes optical fibers, explains the principle of Bragg gratings, their production and their use in sensors. Methods of optical fiber attenuation and phase OTDR measurement are also described. Other part is focused on LabVIEW programming software and utilization of sensorical system and its components. Practical part deals with the user interface itself, which consists of two tabs. The first tab is designed for evaluation and display of measured data. The second tab is used to control and set up system components. Both of these tabs are further subdivided into other subtabs. Regarding the conclusion, further development of the program and options of hardware replacement for improving this sensorical system in the future will be discussed.
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Sensor based on a fiber optic interferometer
Rozsypal, Filip ; Dejdar, Petr (referee) ; Čučka, Milan (advisor)
This diploma thesis deals with comparsion of 2x2 and 3x3 couplers. There is also description of issue of the Michelson interferometer and its use as a sensor. This sensor is very good at detecting vibrations. Part of the work is description of simulation of Michelson interferometer with 3x3 coupler as vibration sensor and localization of vibration on optical fiber by Michelson and Mach-Zehnder interferometer.
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