Перегляд за Автор "Yakovenko, A."

Зараз показуємо 1 - 2 з 2
  • Документ
    Assessment of the fuzzy state of complex systems
    (2020) Yakovenko, A.
    The paper considers the problem of estimating the state of the enterprise (on example of the IT company). The problem is presented in the form of two problems. The first problem is the aggregation of the initial information and the second problem is the identification of the state of a complex system. To solve the problem of aggregation of initial data authors used the fuzzy cluster analysis, namely the fuzzy k-means method. The results allow to formalize linguistic variables, which are characterized by the term-sets and definition range. The numerical results were approximated by analytical membership functions. The solution of the first task allows to generate a set of possible fuzzy reference situations. Each situation is characterized by the reference informational granule, which contains information about formalized linguistic variables. The second problem was solved by using the method of fuzzy logic in the MATLAB environment. In this test case, the search of the situation in which the IT-company is located was performed. At this stage, the current situation belongs to comparison with each reference situation. In this way, authors determined the most similar reference situation to the current situation. An analysis of the resulting situation allows to argue the state of the IT company. The solution of the second task allowed to establish assessment of IT company state. The theoretical and practical results can improve the efficiency of complex system management.
  • Документ
    Increasing the level of energy efficiency of combined power supply systems
    (2021) Yakovenko, A.; Slavov, M.
    The method of construction of the combined system of power supply of consumers from local sources is presented. The key function of the mathematical model of construction is to minimize financial investments in the construction and use of the local energy supply system using renewable energy sources. Recommendations for assessing the efficiency of use of fuel and energy resources by local energy supply systems and determining the conditions of positive economic effect and establishing the composition and basic technical parameters of energy institutions and devices of the local energy supply system are presented. At the same time, the conditions for ensuring the competitiveness of the local energy supply system to the centralized one should be applied. The source of the local power supply system is a biogas plant capable of producing biogas with the possibility of long-term storage, and at the same time being a storage battery and performing the function of highly maneuverable energy for other renewable sources within the united energy system of Ukraine.