Перегляд за автором "Kovalenko, A."
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Публікація Muticriteria Balance Layout Problem of 3d-Objects(Sofia, Bulgaria, 2017) Grebennik, I.; Romanova, T.; Kovalenko, A.; Urniaieva, I.; Shekhovtsov, S.The paper studies the optimal layout problem of 3D-objects in a container with circular racks. The problem takes into account placement constraints (non-overlapping, containment, distance constraints), as well as, behaviour characteristics of the mechanical system (equilibrium, moments of inertia and stability characteristics). We construct a mathematical model of the problem in the form of multicriteria optimisation problem and call the problem the Multicriteria Balance Layout Problem (MBLP). We also consider several realisations of MBLP problem that depend on forms of objective functions and behaviour constraints. В статье рассматривается оптимальная задача размещения 3D-объектов в контейнере с круглыми стойками. В этой задаче учитываются ограничения размещения (неперекрывающиеся, сдерживающие, дистанционные ограничения), а также характеристики поведения механической системы (равновесие, моменты инерции и характеристики устойчивости). Мы строим математическую модель задачи в виде многокритериальной задачи оптимизации и называем проблему проблемой многокритериальной балансной компоновки (ПМБК). Мы также рассмотрим несколько реализаций проблемы ПМБК, которые зависят от форм объективных функций и ограничений поведения.Публікація Redistribution of base stations load in mobile communication networks(ХНУРЕ, 2017) Ruban, I.; Kuchuk, H.; Kovalenko, A.The subject matter of the article is the processes of load distribution in mobile communication networks. The object of research is the handover. The goal is to develop a method for redistributing the load between neighboring areas for mobile nodes. The considered base stations are supposed to have the signal-to-noise ratios that are equal or close. The methods that are used: methods of system analysis, methods of digital signal processing. The following results are obtained. The method that allows mobile nodes, whose signal-to-noise ratios are equal or close, to switch to a less loaded base station. This method allows the base station to launch the handover process enabling more even distribution of the load from mobile nodes among neighboring base stations in wireless and mobile networks. In the suggested modification of the method, the function assessing the bandwidth of the uplink channel is added to the base stations, as well a threshold value for using its bandwidth. Thus, when the current value of bandwidth reaches the threshold, the base station starts sending out a message to all mobile nodes and verifies free neighboring areas for switching over mobile nodes. If there are adjacent areas with a lower load, the base station notifies all potential candidates about the necessity of their switching over. The handover process is launched when the available bandwidth of the base station decreases below a certain threshold. Therefore, it is possible to optimize the operation of the WiMAX network with respect to the criterion of the total bandwidth capacity of the base stations. Besides, the results of the comparative analysis of the handover process in networks based on the WiMAX technology that are obtained using the OpNet simulation environment are presented. Conclusions. The suggested approach can be used to improve the basic software of mobile communication networks. When moving a node from one area to another one in access servers, the node allocation tables are adjusted according to the developed method. Also, the suggested method enables improving and balancing the load of the base stations of mobile communication networks. The obtained results enables maintaining the required level of service quality in mobile communication networks.