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Iemets O.O.,Poltava University of Economics and Trade | Barbolina T.M.,The National Pedagogical University
Cybernetics and Systems Analysis | Year: 2016

The paper establishes the necessary condition for the solution of a linear unconditional problem of combinatorial optimization on arrangements where coefficients of objective function are positive. These results are used to establish the properties of the solution of linear unconditional optimization problem on arrangements for the case where probabilistic uncertainty takes place in the definition of the feasible domain and the minimum is defined according to the linear order introduced on the set of discrete random variables: we formulate and prove the condition that can underlie the search for solution and the ways of constructing the solution in some special cases. © 2016 Springer Science+Business Media New York


Iemets O.O.,Poltava University of Economics and Trade | Barbolina T.M.,The National Pedagogical University
Cybernetics and Systems Analysis | Year: 2016

Linear unconstrained problem of combinatorial optimization on arrangements under stochastic uncertainty is being solved. The minimum is defined as the result of sequential comparison of numerical characteristics of random variables. The properties of the solution of the optimization problem under study are obtained. These properties use the properties of special constructed deterministic problems. The authors also propose the reduction method to solve linear unconstrained problem of combinatorial stochastic optimization, which is based on obtained solution’s properties. © 2016, Springer Science+Business Media New York.


Iemets O.O.,Poltava University of Economics and Trade | Barbolina T.M.,The National Pedagogical University
Cybernetics and Systems Analysis | Year: 2015

Based on the relation of order on the set of discrete random variables, which is introduced in the paper, we formalize a band arrangement of rectangles with stochastic parameters: hitting the band, tangency, intersection, and non-intersection. We also construct a combinatorial mathematical model of optimal rectangle packing when input data are discrete random variables. © 2015, Springer Science+Business Media New York.


Granchak V.M.,Ukrainian Academy of Sciences | Sakhno T.V.,Poltava University of Economics and Trade | Kuchmy S.Y.,Ukrainian Academy of Sciences
Theoretical and Experimental Chemistry | Year: 2014

Recent advances in the investigation of various types of fluorescent materials (organic dyes, coordination compounds of metals, semiconductor quantum dots) used in the development of luminescent solar concentrators are discussed. The advantages and disadvantages of various types of phosphors and also the influence of plasmon effects in the nanoparticles of metals, the nature of the matrix, etc. on the luminescence efficiency of the concentrators are analyzed. © 2014 Springer Science+Business Media New York.


Olexandr L.,University of Kharkiv | Sergiy G.,Poltava University of Economics and Trade
2013 IEEE 33rd International Scientific Conference Electronics and Nanotechnology, ELNANO 2013 - Conference Proceedings | Year: 2013

Current approaches to slot allocation among data bursts in downlink of WiMAX technology were analyzed. As a result of the completed analysis drawbacks of known decisions were distinguished and basic requirements to the slot allocation problem among data bursts were formed. A mathematical model of slots allocation and data burst scheduling in the downlink of IEEE 802.16 standard is proposed. The proposed model is focused on the formation of one data packet in downlink for each subscriber station that minimizes the number of overhead information sent over the used frequency communication channel. The dependence of the amount of slots, forming one data packet from required transmission rate of a subscriber station and type of modulation and coding scheme were analyzed. © 2013 IEEE.


Harkusha S.,Poltava University of Economics and Trade | Harkusha O.,Poltava University of Economics and Trade
Modern Problems of Radio Engineering, Telecommunications and Computer Science, Proceedings of the 13th International Conference on TCSET 2016 | Year: 2016

The frequency resource distribution mathematical model is offered as a problem of subchannels' number balancing between radio channels formed by mesh-stations of the wireless network. The use of the offered model has made it possible to raise efficiency of the wireless mesh-network as a whole and ensure the bottlenecks absence. © 2016 National University Lviv Polytechnic.


Garkusha S.V.,Poltava University of Economics and Trade
CriMiCo 2013 - 2013 23rd International Crimean Conference Microwave and Telecommunication Technology, Conference Proceedings | Year: 2013

The comparative analysis of the proposed model of distribution for time-frequency resource of LTE technology with the existing methods in terms of the overall performance of the downlink, the degree of balancing capacity, as well as the probability of the desired transfer rate allocation to the user equipment (UE). It is shown that the proposed model under high requirements to transfer rate of UE as compared to known methods, allows 5-20% increasing the downlink capacity balance ratio and 40-100% increasing the probability of allocation of required transfer rate to UE. © 2013 CriMiCo'2013 Organising Committee, CrSTC.


Iemets O.O.,Poltava University of Economics and Trade | Parfionova T.O.,Poltava University of Economics and Trade
Cybernetics and Systems Analysis | Year: 2010

A combinatorial transportation problem is examined. In contrast to the classical problem, transportations are permutations of the given vector of possible volumes of transportation. A function is shown to be an estimate of the feasible subset in solving this problem by the branch and bound method. The property of the proposed estimate is revealed, which increases the efficiency of the branch and bound method. © 2010 Springer Science+Business Media, Inc.


Garkusha S.,Poltava University of Economics and Trade
Modern Problems of Radio Engineering, Telecommunications and Computer Science - Proceedings of the 11th International Conference, TCSET'2012 | Year: 2012

The paper analyzes the influence of territorial separation stations and technological characteristics of multiradio multichannel mesh networking the quality of the solution of the allocation of channels. © 2012 Lviv Polytechnic Natl Univ.


Lemeshko A.,Kharkiv National University of Radioelectronics | Garkusha S.,Poltava University of Economics and Trade | Abed A.H.,Kharkiv National University of Radioelectronics
Modern Problems of Radio Engineering, Telecommunications and Computer Science - Proceedings of the 11th International Conference, TCSET'2012 | Year: 2012

The article introduces a two-index model of the distribution channels in the multiradio multichannel wireless mesh networking (MR-MC WMN) standard IEEE 802.11. The model describes the process of distribution channels in both homogeneous and in heterogeneous MR-MC WMN. © 2012 Lviv Polytechnic Natl Univ.

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