Olha Starkova
@hneu.edu.ua
Cybersecurity and Information Technologies Department
Simon Kuznets Kharkiv National University of Economics
RESEARCH, TEACHING, or OTHER INTERESTS
Computer Science
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Olga Borziak, Dmytro Plugin, Olha Starkova, and Dmitro Bondarenko
AIP Publishing
Dmitriy Goncharenko, Olha Starkova, Andrey Karahiaur, Yevgeniy Degtyar, and Olena Voskobiinyk
AIP Publishing
Tatiana Kostyuk, Andrii Plugin, Olha Starkova, Dmitro Bondarenko, and Olga Borziak
AIP Publishing
K Plakhotnikov, O Starkova, O Dedenova, D Bondarenko, and O Demina
IOP Publishing
Abstract The paper presents the results of development and research of an innovative thin-layer thermal insulation material that protects the building from heat loss due to thermal radiation. The material is a dry mortar of cement binder and filler of hollow aluminosilicate microspheres. A thin-layer coating made from this optimally combines the functions of effective heat protection and external finishing warm plastering that is advantageous when reconstructing and restoring historical objects with a lavish decoration. The conducted studies have shown that aluminosilicate microspheres in the composite thermal insulation coating are also involved in the reflection of infrared radiation. The use of Class 2 admixtures made it possible to synthesize additional crystalline hydrates with the aluminate phase of clinker brick, which contributed to the strengthening of the cement composite at the micro- and submicrolevels. This was confirmed by electron microscopy. For the developed composition of the mineral thin-layer thermal insulation coating, the cost of the mixture is almost 3 times lower than for the known composition of the thermal insulation coating on the polymer binder. In addition, unlike polymer analogs, there are no restrictions in terms of temperature and service life. The thermal insulation coating may be applied both exteriorly and interiorly with no condensation being formed between the wall and the coating. Applying the developed thin-layer thermal insulation coating on a brick wall measuring 10 m by 10 m in the climatic conditions of Kharkiv allows reducing heat consumption by 0.188% per 1 m2 per year.
O V Starkova, A I Aleinikova, and Y V Kolomiiets
IOP Publishing
Abstract Factors affecting the operational life of the water supply and sewer utility networks have been investigated. A method has been proposed for identifying the main factors affecting the operational reliability of distribution networks, which is based on the use of the expert evaluation method. It has been found that the most affecting factors are: pipeline material; corrosion of pipe and joint materials due to the corrosive environment; technical condition; service life; non-compliance of pipe grades to design value; ambient operation conditions. A more in-depth study of the issue will allow operating companies to promote the extension of the operation life of distribution networks.
Natalia Sizova, Olha Starkova, Ganna Solodovnik, and Natalya Dolgova
Private Company Technology Center
The paper reports the proposed method of quantitative analysis of risks in investment construction projects, which uses a probabilistic approach. The specific feature of this approach is a multistage evaluation process and complex accounting of indicators for decision making regarding the investment attractiveness of sites under conditions of uncertainty. Based on this approach, an automated computer model for evaluating investment attractiveness of construction projects was developed. The indicators of investment efficiency and risks for various options of construction project implementation were explored, the alternative for a project development was selected and the best investment project was determined with the use of the computer model. The reliability of the results was proved by studying the stability of decisions and by their errors. The results were obtained in order to improve the efficiency of managerial decisions in the sector of investment in construction sector of economy. The developed computer model makes it possible, based on statistical data of demand for residential real estate, to perform a quantitative analysis of risks of investment in construction projects, to make a choice of a construction project by profitability and risk indicators, as well as by the criteria of decision making under conditions of risk and uncertainty. Numerical experiments with a computer model showed the need to invest in additional research in order to clarify the environmental parameters and to invest in the construction of a multi-storey building. The obtained results are relevant due to a high degree of turbulence in the environment in the construction sector, as well as in connection with the importance of attracting investments from the position of competitiveness. The computer model developed in the process of research is universal regarding the type of a residential real estate construction object
Dmitriy Goncharenko, Ihor Shumakov, Olha Starkova, Alevtyna Aleinikova, and Revaz Mikautadze
EDP Sciences
The article is devoted to the methodological and software tools for choosing organizational and technological solutions to maintain sewage collectors in an operable state to increase their service life. Such a tool must take into account a set of factors that affect the operation of sewer collectors and form a system, the implementation of which would improve the existing principles of monitoring the status of sewer collectors, identify effective organization and technological solutions of their renovation by taking into account factors that affect their safe operation, the facilities risk of accidents categories, conditions and parameters of works performance. For determining the optimal options for the renovation of the sewer collector using the developed mathematical and computer models, the results of problems solving were generalized: one-criterion optimization subject to the choice of one repair method; one-criterion optimization subject to the choice of different repair methods for the areas; multicriterion optimization.
Dmitriy Goncharenko, Olga Starkova, Alevtyna Aleinikova, Yulyia Kolomiiets, and Oksana Greenchuk
EDP Sciences
The article is devoted to the development of technological and organizational solutions for elimination of local emergency damage to sewage tunnel collectors. In the article, conditions of operation and constructions of the sewage tunnel collector destroyed by corrosion are investigated on Grekovska street in Kharkiv, Ukraine; the methods of production of repair and restoration works are analyzed in this article; technological and organizational solutions have been developed for the liquidation of emergency damage to sewage tunnel collectors, taking into account technical, organizational and economic indicators. Thus, when comparing recovery options by different methods, it is noted that the proposed technology is more economically feasible in view of the relatively low cost of the material for this solutions. At the same time, the duration of the work by the proposed method of extrusion by introducing a secondary lining with anticorrosive properties will be reduced by 30%.
Dmitrii Goncharenko, Dmitrii Bondarenko, and Olha Starkova
Emerald
Purpose This paper aims to investigate the condition and select a repair procedure for a damaged sewer in Kharkiv, Ukraine. Design/methodology/approach Inspection shafts are critical objects in the sewerage networks and are exposed to the strong influence of destructive processes, which are mainly corrosion of concrete structures, penetration of surface water inside structures, static and dynamic loads generated by truck transport, deviations from the codes and errors in construction, poor quality of the shaft wall surface, aggressive biological environment and ground subsidence. Therefore, selecting the optimum repair technology is of current interest. Findings The problems of repair and refurbishment of inspection shafts in deep-level sewer tunnels were considered. The technical and technological solutions using profiled polyethylene, reinforced slag cast panels, ceramic bricks and protective coatings are given. The advantages and disadvantages of the proposed technologies and examples of their practical application are shown. Originality/value This study performs reconstruction and strengthening work for a damaged section of the inspection shaft without shutdown.