National Repository of Grey Literature 69 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Long-term Perimeter Protection System Monitoring Using State of a Polarization Analyzer
Tomasov, Adrian ; Dejdar, Petr ; Záviška, Pavel ; Spurny, Vladimir ; Munster, Petr ; Horvath, Tomas ; Klicnik, Ondrej
The paper proposes the deployment of a perimeterand data protection system with long-term data storage in anInfluxDB time-series database enhanced by a graphical interfacebased on a Grafana dashboard. The perimeter is protected usinga fiber optic cable, and the transmitted light is analyzed by a stateof polarization analyzer detecting mechanical vibrations. Usinga simple spectrum comparison method and a threshold, it candetect a perimeter breach and generate an alert.
Software defined networks
Denisov, Artem ; Horváth, Tomáš (referee) ; Tomašov, Adrián (advisor)
The content of this work is a description of the ONOS controller for software defined networks (SDN) and the design of laboratory tasks to demonstrate the activities of the controller. Part of the work is also a description of the basic technologies on which the operation of SDN mechanisms and the use of VxLAN technology in these networks is based. Next, the described principles will be tested in terms of network infrastructure virtualization.
Laboratory exercise: Modeling of photonic communication networks
Kovaříková, Hana ; Horváth, Tomáš (referee) ; Münster, Petr (advisor)
The bachelor’s thesis deals with the issue of modern high-speed data networks and their simulation in the MATLAB Simulink environment. The theoretical part is devoted to optical networks, fibers, their properties and standards. The thesis also explains the subject of passive and active optical networks, including their components. Laboratory tasks are devoted to the simulation of the transmission of a passive optical network with a splitter and an active optical network with an amplifier.
Laboratory task - system for measurement of optical fibre attenuation by direct method
Jančová, Silvie ; Horváth, Tomáš (referee) ; Dejdar, Petr (advisor)
The bachelor's thesis deals with the issue of attenuation in optical fibers and subsequent measurement using the transmission method. The theoretical analysis deals with the optical fibers themselves and their transmission properties with an emphasis on dispersion and standards. The original idea of the practical part was the implementation with a photodetector. Due to the small power of the photodetector, the practical part focuses on the demonstration of attenuation measurement using measuring devices that are commonly used in practice. In the laboratories, optical fibers with a length of several tens of kilometers are used for demonstration. The laboratory task will help students to master the basic units of attenuation and gain an understanding of measurement in practice.
Event detection in camera records
Smolnikov, Mikhail ; Sikora, Pavel (referee) ; Horváth, Tomáš (advisor)
This bachelor thesis focuses on the problem of detection and classification of moving objects in video sequences. The thesis describes the basic algorithms and methods of image data processing, including an introduction to the use of neural networks. The practical part shows the internal logic of a desktop application that allows users to evaluate their own video sequences for the occurrence of movements. The resulting application speeds up the process of video analysis on a selected device many times over.
Spam detection methods
Rickwood, Michal ; Horváth, Tomáš (referee) ; Oujezský, Václav (advisor)
Hlavním cílem této práce je navrhnout a implementovat detekční algoritmus na spam, který využívá výhradně záznamy provozu v podobě Netflow zpráv. Poskytovatelé internetových služeb musí spam detekovat, aby zabránili označování celých jejich subnetů za spammery. Algoritmus byl navržen na základě analýzy mnohých datasetů obsahující Netflow záznamy. Tyto datasety obsahovaly validní emaily, spam a také běžný internetový provoz. Algoritmus v prvním kroku využívá domain name system blacklistů pro verifikaci spammovací stanice. Veškerá komunikace ze stanic, které se objeví na některém ze seznamů jsou okamžitě zahozeny. Filtrační kritéria algoritmu jsou aplikována pouze na stanice, které nejsou blacklisty označeny. Tato kritéria byla rozdělena na akceptační a seřaďovací. Akceptační kritérium bylo navrženo k nalezení potenciálně významných stanic. Bylo formulováno pět kritérií určených k seřazování těchto vybraných IP adresy dle pravděpodobnosti, že se jedná o spamovací stanice. Za každým kritérium stojí matematická rovnice vracející hodnotu mezi 0 a 1. Celkový součet takto vrácených hodnot se u spamovacích stanic blíží k pěti, zatímco legitimní stanice mají hodnoty znatelně nižší. Výstupem vyvinutého algoritmu je seznam potenciálních spamovacích stanic seřazených podle pravděpodobnosti, že se jedná o spamovací stanice.
Nonlinear phenomena in optical fibers
Burian, Radek ; Horváth, Tomáš (referee) ; Münster, Petr (advisor)
The subject of this thesis is to describe nonlinear phenomena in the optic fiber. The theoretical part describes a principle of transmission in optical fibers. Optics modules, fibers and their parameters are described marginally. Except nonlinear phenomena, there is also described linear phenomena such as attenuation, dispersion, scattering. In terms of nonlinear phenomena there is described second order phenomena such as Second harmonic generation (SHG), Sum and difference harmonic generation (SFG and DFG) and third order phenomena, such as Kerr effect, Third harmonic generation (THG), Four-wave mixing (FWM) and Cross phase modulation (XPM). There are also described nonlinear scattering, such as Raman´s and Brillouin´s scattering. The Four-wave mixing is simulated in the first half of the practical part. Four-wave mixing occurs in DWMD systems, where can invoke cross-talks between channels. In the second half of the practical part is measured this nonlinear phenomenon. The aim of the measurement is to understand the behaviour of the FWM and find the way how to eliminate its power. The Four-wave mixing measurement is based on the simulation. Second measurement is designed for Brillouin scattering. The conclusion from simulated and laboratory part from both measurements are compared with theoretical knowledge.
Optical network design
Polaček, Adam ; Tomašov, Adrián (referee) ; Horváth, Tomáš (advisor)
This bachelor thesis deals with the design of a technological optical network for the area of Hradec Králové, for the company ČEZD Distribuce. The theoretical part of the thesis describes the current network design and discusses network protocols. The practical part of the thesis describes the passive part and the logical part of the network. An important part of the thesis, is the fiber scheme and configuration design for router and switch. In the last part of the thesis, simulation in GNS-3 program is shown.
Optical access network management
Bartko, Samuel ; Ružička, Michal (referee) ; Horváth, Tomáš (advisor)
This Bachelor thesis is concerned about optical access network in theoretical part, where it describes working principle of optical network. The main concern is put on passive optical networks, where it describes XGS-PON standard. In practical parts describes connection and making functional network with XGS-PON. In the last part there is a manual for laboratory task, which has a goal of making students understand the issue of activating end point unit in XGS-PON network.
100G passive optical network
Sporni, Alex ; Tomašov, Adrián (referee) ; Horváth, Tomáš (advisor)
This diploma thesis deals with the current state of development of passive optical networks, with the main emphasis on high-speed passive optical networks of 50 Gb/s and higher. The opening part of the thesis provides a theoretical introduction to optical access networks, their division, elements of passive optical networks and the subsequent analysis of the latest standards. As part of the implementation, simulation topologies for various simulation scenarios are designed in the VPIphotonics Transmission Maker tool. The proposed simulations are properly evaluated in the next chapter. The quality of the proposed simulation topology is assessed using bit/symbol error rate and in some cases in combination with an eye diagram (quality factor). The output of the work are simulation scenarios for various configurations and modulation formats of the proposed optical networks. The output of the work is also a laboratory task, which will be used for teaching purposes.

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