Перегляд за Автор "Nikolskiy, Serhiy"

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  • Ескіз
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    Methodology of network environment testing for IoT devices
    (National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", 2021) Her, Vladyslav; Taraniuk, Viktoriia; Tkachenko, Valentyna; Nikolskiy, Serhiy; Klymenko, Iryna
    The article describes the basics of testing: writing test documentation (an example based on a report defect was proposed) and some testing methods. A performance test was also developed to test the load. Received basic knowledge of testing theory, as well as skills of writing and using bash scripts for performance tests.
  • Ескіз
    ДокументВідкритий доступ
    The method of SDN clustering for controller load balancing
    (National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", 2020) Dolynnyi, Oleksandr; Nikolskiy, Serhiy; Kulakov, Yurii
    The paper proposes the method of SDN clustering using connections density and controller load distribution that solves the problem of controller load balancing. Clustering efficiency criteria have been considered, including fault tolerance, controller-to-switch and intercontroller latency and network limitations. Review of the key clustering methods has been performed, and the base algorithm for modification has been chosen. Density-based controller placement algorithm is modified to solve the problem of multicontroller placement. Metric of the node boundary index is introduced to advance the efficiency of proposed algorithm. A software implementation of the developed algorithm has been created, and its performance has been tested. The algorithm’s modelling results have been compared with those of the other algorithms using the metrics of distribution of service traffic propagation delay and computational speed in relation to network topology size.