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Skakalina O.V.,Poltava National Technical University
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu | Year: 2015

Purpose. The creation of the information apparatus for short-term forecasting of key indicators of economic entities (EE) industrial activity based on combinatorial and neural network algorithms of the group method of data handling (GMDH). Methodology. This work presents a methodology for short-term forecasting of main economic indicators of industrial activity of an economic entity using modifications in the classical algorithm of the GMDH, comparing the effectiveness of combinatorial and neural network algorithms of the GMDH. Findings. The analysis of forecasting methods reasoned the choice of the neural network algorithm of the GMDH for the research. The optimal model structure has been compiled and the dependence of the output parameters on the selected input parameters of the system has been derived. The analysis of economic indicators of an agricultural holding has been done. The research results are presented via graphic visualization. The effectiveness of the application of the modified GMDH algorithms for forecasting production trends for up to 3 years has been proved. The regularities of the data changes were revealed. The accuracy of the results was evaluated. Originality. On the basis of the content analysis of the main indicators characterizing the agricultural holding industrial activity, new approaches to the construction of optimal models were proposed, taking into account characteristics of the subject area, which improves the quality of managerial decision making. Information technology for short-term forecasting based on neural network algorithm of the GMDH has been developed. Practical value. The proposed technique allowed us to conduct the short-term forecasting of main economic indicators of an economic entity industrial activity (selling goods and services, cost of the sold products, gross profit, net profit; commercial, general and administrative expenses). The obtained accuracy assessment of the forecasting results is within the range from 1 to 5%. © 2015 Skakalina O.V.. Source


Gasii G.M.,Poltava National Technical University
Metallurgical and Mining Industry | Year: 2014

New elements in relation to machine building and mining industry with application of construction materials using mount system of mine opening as an example are considered. The elements combine durability and reliability necessary for exploitation. Reliability of composite reinforced concrete is confirmed by experimental and theoretical researches. Flat-rod elements with application of composite reinforced concrete are the results of synthesis of structural, steel and concrete elements, acquired during this advantages and peculiarities, determine their efficiency. © Metallurgical and Mining Industry. Source


Gutak A.D.,Poltava National Technical University
International Journal of Refrigeration | Year: 2014

Despite long period of study, Ranque effect remains unexplored in natural gas industry. There is a lack of industrial operation data. No information was found about achieving high temperatures due to Ranque effect on natural gas plants. In present experimental research, temperature separation in high pressure natural gas stream within a counter flow vortex tube was investigated. An industrial vortex tube was designed and implemented into low-temperature separation plant. It was found that Joule-Thomson effect has significant influence on temperature separation process and should be taken into account when analyzing operation data. Noticeable heating effect under investigated conditions could be seen only at very small hot stream mass fractions. To avoid liquid loading problems free gas condensate and water should be removed before the vortex tube or directly from its body. The increase of pressure ratio leads to higher temperature differences. Cold stream temperature drop is higher than Joule-Thomson effect on almost all range of cold stream mass fractions. The ejecting type of flow was achieved in experiments that causes the reduction of Ranque effect efficiency. However, such flow could also be useful for utilization of flashed petroleum gases. © 2014 Elsevier Ltd and IIR. All Right Reserved. Source


Pliukhin O.,Poltava National Technical University
Symmetry | Year: 2015

A wide range of reaction-diffusion systems with constant diffusivities that are invariant under Q-conditional operators is found. Using the symmetries obtained, the reductions of the corresponding systems to the systems of ODEs are conducted in order to find exact solutions. In particular, the solutions of some reaction-diffusion systems of the Lotka-Volterra type in an explicit form and satisfying Dirichlet boundary conditions are obtained. An biological interpretation is presented in order to show that two different types of interaction between biological species can be described. © 2015 by the author; licensee MDPI, Basel, Switzerland. Source


Pavlenko A.,Poltava National Technical University | Koshlak H.,Poltava National Technical University
Metallurgical and Mining Industry | Year: 2015

In the article mathematical model of formation of pores of raw material mixture is resulted with the purpose of receipt of porous heat-insulation material on the basis of soluble hydrosilicate. The developed mathematical model and its decision enable to forecast the basic technological indexes of process of taking into account forming of necessary structure of porous material. All thermophysical properties depend on the structure of material. © Metallurgical and Mining Industry, 2015. Source

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