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Accelerated sensor data analysis using an embedded system with a graphics processing unit
Maczkó, Adam ; Myška, Vojtěch (oponent) ; Tomašov, Adrián (vedoucí práce)
The thesis deals with two main goals, namely the acceleration of data analysis and the subsequent visualization of this data. The purpose is to speed up the supplied application so that it is suitable for protecting optical infrastructures through real-time analysis of polarization state changes and visualization of its outputs. The thesis describes topics that are important in terms of accelerating computations on the graphics processor, particularly principles of parallelism, parallel programming, processes, threads, and parallel architectures. In addition, the thesis describes the capabilities of the Jetson Nano platform. The output of the thesis is an application that is capable of performing computations on the graphics processor and has a web interface for visualizing the analyzed data. The PyTorch library was used for acceleration on the graphics processor. Visualisation was achieved through the React framework in conjunction with the react-spectrogram and ApexCharts libraries.
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Distributed acoustic sensing system data analysis applied for perimeter protection
Senčák, Jakub ; Dejdar, Petr (oponent) ; Tomašov, Adrián (vedoucí práce)
This work focuses on fiber optic sensing using distributed acoustic sensing. The goal was to create a multiplatform application for data visualization obtained by an Optasense ODH-F interrogator. This work was motivated by the lack of open-source visualization applications for fiber optic sensing. Distributed acoustic sensing was explained with light scattering effects such as Rayleigh, Raman, and Mandelsam-Brillouin scattering. A web application was implemented. There are two parts, back-end was written in Python, and the frontend was written using the Svelte framework. The results of this work can be used as a basis for creating visualization software for distributed acoustic sensing.
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Anomaly and threat detection in audit logs using machine learning
Ludes, Adam ; Ježek, Štěpán (oponent) ; Tomašov, Adrián (vedoucí práce)
The thesis explores cloud-native architecture, anomaly detection techniques, machine learning, and data analysis to develop an anomaly detection model for audit logs from the Red Hat OpenShift Container Platform. Statistical methods and time series analysis for anomaly detection are introduced, while machine learning models and preprocessing techniques are implemented and evaluated. The results demonstrate limitations in traditional models for handling anomalies in deeply nested data, while the NLP model shows robust performance. This research provides valuable insights and is a reference for researchers and practitioners in cloud-native architecture, anomaly detection, machine learning, and data analysis.
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Secured transfer of digital messages
Horký, Matyáš ; Juráň, Radovan (oponent) ; Tomašov, Adrián (vedoucí práce)
The Master thesis examines alternative approaches to e-mail. While it is the most common and universal approach to communicate with nearly anyone online, be it a person or an organization, it suffers from both technical and practical insufficiencies like the lack of reliability and privacy. The thesis evaluates the e-mail ecosystem and the current state of cryptography. It proposes a new protocol and file format that could replace the e-mail nearly transparently. The protocol is built on mTLS and PKI; it defines specific messages that can be used to negotiate data transfer between clients and servers. The file format is a linearly parseable custom binary format structured in a header–length–data manner. The result is evaluated on new ideas and new drawbacks, along with general thoughts about e-mail’s place on today’s internet.
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Analyzátor optických tras OTDR
Šimková, Barbora ; Tomašov, Adrián (oponent) ; Dejdar, Petr (vedoucí práce)
Cílem této diplomové práce byl teoretický rozbor problematiky OTDR, rozbor komponentů zařízení OTDR a také základních parametrů tohoto zařízení. Součástí diplomové práce je i teoretický rozbor odrazů, rozptylů a jednotlivých typů konektorů. V rámci praktické části byl proveden návrh zapojení pro měření metodou OTDR a jeho následná realizace. Zapojení bylo realizováno s vývojovou deskou Red Pitaya a laserem Koheron. Dále bylo vytvořeno také zapojení pro měření přímou metodou. Ve vývojovém prostředí LabView byl vytvořen program včetně grafického uživatelského rozhraní. Navržena byla také laboratorní úloha, která slouží k základnímu pochopení problematiky měření OTDR.
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Performance comparison of a signal processing pipeline execution using CPU and GPU
Tomašov, A. ; Horváth, T.
The paper compares the execution performance of NumPy and PyTorch mathematical libraries in embedded systems with graphics processing unit (GPU) acceleration. Both frameworks execute a signal processing pipeline from a fiber manipulation detection system, which inspects a signal from a state of polarization analyzer to enhance the security of optical fiber. The performance comparison is evaluated in the NVIDIA Jetson Nano system with 128-core Maxwell GPU. Based on the measured results, the PyTorch library executed on the GPU has performance improvement from 59 % to 84 % on different batch sizes. The results prove the real-time analysis capabilities of such a system with GPU acceleration.
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Implementation of SCADA architecture into fiber optic seNSING systems
Šišolák, Filip ; Tomašov, Adrián (oponent) ; Dejdar, Petr (vedoucí práce)
The bachelor thesis deals with the issue of data control and acquisition using SCADA technology and the subsequent implementation of two-way communication. The theoretical examination also includes an analysis of the current state of use of SCADA in optical sensing systems. In view of the shortcomings of the available SCADA systems, our own software programmed in the LabVIEW development environment is implemented. The Modbus TCP protocol is used for communication with the myRIO platform. Part of the work is also the analysis of the maximum achievable throughput with the Modbus TCP protocol.
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Optical network design
Polaček, Adam ; Tomašov, Adrián (oponent) ; Horváth, Tomáš (vedoucí práce)
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.
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Measurement and monitoring of optical fiber infrastructures
Baláž, Dominik ; Tomašov, Adrián (oponent) ; Münster, Petr (vedoucí práce)
This bachelor thesis deals with measurement and monitoring methods on optical path. The basic principles and transmission using optical fibers, optical fibers, band splitting and transmission characteristics such as attenuation and dispersion are discussed. The principle of wave multiplexing and recommendations according to ITU-T standards are also presented. Afterwards, measurements on optical fibres are described, instruments and methods for measuring and monitoring the optical path are presented in detail, and these instruments are compared in terms of their parameters and individual functions. In the practical part, cleaning of connectors, inspection of connectors, measurement of optical path without bending and with different bend radii using OTDR, direct method and measurements using FC BERT application, which is a substitute for the monitoring system, are described, the values from these measurements are evaluated both numerically and graphically.
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100G passive optical network
Sporni, Alex ; Tomašov, Adrián (oponent) ; Horváth, Tomáš (vedoucí práce)
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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