Oleksandr Vovna

Prof. Dr. Oleksandr Vovna

orcid

Research Focus & Metrics

Academic Career Length

10Years (2017-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
28 November 2022 in Journal of Artificial Intelligence and Soft Computing Research
Verified
Journal Article
Open access
PDF file
ILIvan Laktionov
Ivan Laktionov
OVOleksandr Vovna
Oleksandr Vovna
MKMaryna Kabanets
Maryna Kabanets
Nowadays, applied computer-oriented and information digitalization technologies are developing very dynamically and are widely used in various industries. One of the highest priority sectors of the economy of Ukraine and other countries around the world, the needs of which require intensive implementation of high-performance information technologies, is agriculture. The purpose of the article is to synthesise scientific and practical provisions to improve the information technology of the comprehensive monitoring and control of microclimate in industrial greenhouses. The object of research is non-stationary processes of aggregation and transformation of measurement data on soil and climatic conditions of the greenhouse microclimate. The subject of research is methods and models of computer-oriented analysis of measurement data on the soil and climatic state of the greenhouse microclimate. The main scientific and practical effect of the article is the development of the theory of intelligent information technologies for monitoring and control of greenhouse microclimate through the development of methods and models of distributed aggregation and intellectualised transformation of measurement data based on fuzzy logic.

13 March 2025 in Sustainability
Verified
Journal Article
Open access
PDF file
Ivan SakhnoIvan Sakhno
Ivan Sakhno
SSSakhno Svitlana
Sakhno Svitlana
OVOleksandr Vovna
Oleksandr Vovna
Underground coal gasification (UCG) is a clean and automated coal technological process that has great potential. Environmental hazards such as the risk of ground surface subsidence, flooding, and water pollution are among the problems that restrict the application of UCG. Overburden rock stability above UCG cavities plays a key role in the prevention of the mentioned environmental hazards. It is necessary to optimize the safety pillar width to maintain rock stability and ensure minimal coal losses. This study focused on the investigation of the influence of pillar parameters on surface subsidence, taking into account the non-rectangular shape of the pillar and the presence of voids above the UCG reactor in the immediate roof. The main research was carried out using the finite element method in ANSYS 17.2 software. The results of the first simulation stage demonstrated that during underground gasification of a thin coal seam using the Controlled Retraction Injection Points method, with reactor cavities measuring 30 m in length and pillars ranging from 3.75 to 15 m in width, the surface subsidence and rock movement above gasification cavities remain within the pre-peak limits, provided the safety pillar’s bearing capacity is maintained. The probability of crack initiation in the rock mass and subsequent environmental hazards is low. However, in the case of the safety pillars’ destruction, there is a high risk of crack evolution in the overburden rock. In the case of crack formation above the gasification panel, the destruction of aquiferous sandstones and water breakthroughs into the gasification cavities become possible. The surface infrastructure is therefore at risk of destruction. The assessment of the pillars’ stability was carried out at the second stage using numerical simulation. The study of the stress–strain state and temperature distribution in the surrounding rocks near a UCG reactor shows that the size of the heat-affected zone of the UCG reactor is less than the thickness of the coal seam. This shows that there is no significant direct influence of the gasification process on the stability of the surrounding rocks around previously excavated cavities. The coal seam failure in the side walls of the UCG reactor, which occurs during gasification, leads to a reduction in the useful width of the safety pillar. The algorithm applied in this study enables the optimization of pillar width under any mining and geological conditions. This makes it possible to increase the safety and reliability of the UCG process. For the conditions of this research, the failure of coal at the stage of gasification led to a decrease in the useful width of the safety pillar by 0.5 m. The optimal width of the pillar was 15 m.


12 August 2023 in Engineering Applications of Artificial Intelligence
Verified
Journal Article
Open access
ILIvan Laktionov
Ivan Laktionov
Leszek RutkowskiLeszek Rutkowski
Leszek Rutkowski
OVOleksandr Vovna
Oleksandr Vovna
ABAleksander Byrski
Aleksander Byrski
MKMaryna Kabanets
Maryna Kabanets

30 June 2020 in International Journal of Design & Nature and Ecodynamics
Verified
Journal Article
Closed access
ILIvan Laktionov
Ivan Laktionov
OVOleksandr Vovna
Oleksandr Vovna
MKMaryna Kabanets
Maryna Kabanets
MDMaryna Derzhevetska
Maryna Derzhevetska
AZAnatolii Zori
Anatolii Zori

1 January 2018 in International Journal on Smart Sensing and Intelligent Systems
Verified
Journal Article
Open access
PDF file
ILIvan Laktionov
Ivan Laktionov
OVOleksandr Vovna
Oleksandr Vovna
AZA. A. Zori
A. A. Zori
VLV. A. Lebedev
V. A. Lebedev
The article focuses on the research results concerning development and laboratory testing of simulation and physical models of the computerized monitoring and control system for industrial greenhouse microclimate parameters. The simulation model of the system has been developed and tested in the environment of Proteus computer-aided design. The hardware component has been substantiated and implemented, and the software of the system physical model has been developed by using modern microprocessor and sensor technologies. The priority research of the developed computerized system is identified in order to increase the productivity of industrial greenhouse complexes.