name
Kovalenko Anna Vladimirovna
Scholastic degree
•
Academic rank
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Honorary rank
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Organization, job position
• Kuban State University
кафедра прикладной математики
доцент
Research interests
Современные информационные технологии, нейронные сети, нечёткие продукционные системы, гибридные системы, многомерный статистический анализ, финансовоэкономическое состояние предприятия, отрасли, региона, кредитоспособность, инвестиционная привлекательность
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Articles count: 51
Сформировать список работ, опубликованных в Научном журнале КубГАУ

01.00.00 Physicalmathematical sciences
DescriptionThis article is a continuation of the works [1,2], which were devoted to the study of hydrodynamics and transport of salt ions in the experimental electrochemical cell with a rotating disk with a cation exchange membrane of exact current modes, when the condition of local electroneutrality. This article presents a mathematical model of transport of salt ions in a cell with a rotating disk with a cation exchange membrane exorbitant current regimes, taking into account electroconvection. Under these conditions, fluid dynamics depends on the ion transport process salt and described by the system of NavierStokes equations in cylindrical coordinate system with the electric forces

01.00.00 Physicalmathematical sciences
DescriptionThis article describes a mathematical model of transport of salt ions in a cell with a rotating disk cation exchange membrane at transcendent current regimes, taking into account electroconvection. Based on this model, we had a theoretically study of the process of transfer of salt ions and the dependence of the thickness of the diffusion layer from the fall of potential. This article is a continuation of [8] and [9], it conducted a numerical analysis of boundary value problem for a system of equations NernstPlanckPoisson and NavierStokes equations, modeling the transport of salt ions in a cylindrical cell with a rotating disc cation exchange membrane based on electroconvection. It is shown there is an electroconvection vortex in the center of the membrane disc. The solution flows around this vortex and forms a stagnation zone in front of it. With the increase in the size of the fall of potential, the electroconvective vortex decreases and at some value, the electroconvective vortex disappears. The study was conducted in the 1000 s when the angular velocity of 30 turns in a minute and change of the potential difference of 0.2V to 1.4V with a step 0.1. As a result, in this study it is shown that the thickness of the diffusion layer is practically linearly dependent on the fall of potential. The linear dependence of the thickness of diffusion layer from the fall of potential, in the first approximation, is disturbed by a slight deflection curve, the causes of which are needed to be found by means of extra experiments

FINANCIAL RISK WARNING AT OIL PRODUCTION COMPANIES
08.00.13 Mathematical and instrumental methods of Economics
DescriptionThis article is devoted to a problem of effective management of a financial and economic condition of companies on the example of the enterprises of oil products supply. We consider questions of support of adoption of management decisions which concern stabilization of a financial condition of the company and as a result of decrease in financial risks. The article also provides a description of the program complex called FESP_ON developed by the authors allowing to carry out the profound complex assessment of a financial and economic condition of Societies of oil products supply

REASONS OF ELECTRO CONVECTION IN ELECTRO MEMBRANE SYSTEMS
01.00.00 Physicalmathematical sciences
DescriptionIn the article, the reasons of occurrence and development of electro convection in electro membrane systems are analyzed. The basic rules of occurrence and development of process of electro convection in the channel desalination of electro dialysis apparatus are revealed

SOFTWARE TOOLS TO ANALYZE THE REGION'S CREDITWORTHINESS
DescriptionThis article is a continuation of [1, 2] and is devoted to the description of a program complex "RegionCredit" for the assessment of financial stability, economic development, credit, socioeconomic status and investment attractiveness of Russian regions. The article is an example of a comprehensive credit analysis, socioeconomic status and investment attractiveness of Krasnodar Region for the period from 2008 to 2014 with the help of a program complex "RegionCredit", whose results are compared with peer review rating agency AK&M

05.13.18 Mathematical modeling, numerical methods and software complexes
DescriptionThe article presents ways to estimate the socioeconomic condition of the subjects of the Russian Federation using fuzzy production systems, discriminant analysis and neural networks. This study is based on the thirteen indicators of the socioeconomic condition of the regions of the Russian Federation identified by RIA Rating rating agency. The goal of the work is to develop a software package combining the estimation methods above and allowing to get three alternative estimation options for a subject of the Russian Federation, using these thirteen indicators. The developed program assigns each region an estimation from the following set: AAA– the highest socioeconomic condition, AA  very high, A– high, BBB– above average, BB– average, B– below average, CCC– low, CC– very low, C– the lowest indicators of the socioeconomic conditions in the region of the Russian Federation. The software package is developed in Matlab and has an intuitive interface. The results can be used as an alternative to current methods of estimation of the socioeconomic indicators

THE DEVELOPMENT OF COUNTRIES' CREDIT RATING ASSESSMENT SYSTEM
01.00.00 Physicalmathematical sciences
DescriptionThis work presents a new approach to the countries’ credit rating definition, based on the advanced mathematical models, such as neural network model, multiple regression, cluster analysis and discriminant analysis. A range of the analyses such as discriminant, cluster, multiple regression models and a neural network were performed on the following economic figures: GDP per capita, GDP value, annual growth rate of GDP, FDI  foreign investment, rate of unemployment, consumer price inflation index, the size of government debt in percentage of GDP. The results, obtained for each model were combined in the countries’ credit rating estimation system called "7M"

CALCULATION AND ANALYSIS OF TIME BEHAVIOR OF ELECTROCONVECTION IN MEMBRANE SYSTEMS
01.00.00 Physicalmathematical sciences
DescriptionThe aim of this work is to carry out numerical analysis of time behavior of electroconvection in membrane systems, such as a desalting channel of electrodialysis apparatus. The currentvoltage curve and the solution flaw were analyzed theoretically using mathematical models of ions transfer taking into account electroconvection in smooth desalting channel consisting of ideally selective anion and cationexchange membranes. The Hurst numbers for different parts of the currentvoltage curve were calculated in order to determine whether the parts were persistent. The Fourieranalysis of the oscillating term of the currentvoltage curve was carried out for the first time so as to determine predominant frequencies in the signal. Frequencies of passing of complexes of vortexes through the crosssection of the desalting channel were calculated. Frequencies of oscillations of concentration profiles were determined. It was found that the frequencies of oscillations of the concentration profiles coincide with the frequencies of passing of complexes of vortexes through the crosssection of the desalting channel. The oscillations of the currentvoltage curve were physically interpreted. Namely, it was shown that the main frequency of oscillations of the currentvoltage curve corresponds to the frequency of oscillations of the concentration profiles. The oscillations of the concentration profiles, produced by the passing of complexes of vortexes, cause oscillations of conductivity and, consequently, cause oscillations of resistance and of the current density. It was shown that the main frequency of the signal corresponds to the frequency of passing of complexes of vortexes through the crosssection of the desalting channel

Description
The article provides an overview of the basic rating methodologies, describes an algorithm of the own methodology for estimation the creditworthiness and investment attractiveness of the agricultural enterprises of Krasnodar region, using modern mathematical models. The rating of 30 agricultural enterprises of various patterns of ownership and scale is presented. The rating of 30 agricultural enterprises of various patterns of ownership and scale is presented

Description
For effective management of economic and financial activity of a modern enterprise it is required to have information – software supply for its separate components: branches, divisions, services. Automation of the account allows accelerating significantly the process of granting, processing and the analysis of information necessary for the purposes of management. An important aspect on introduction of a program complex is the concept on its realization, i.e. the head of the company should define the way of development of automation of business  processes, what type of introduction is more preferable to the enterprise, what documents will formalize each of the stages. The article generalizes the data obtained by practical consideration on the basis of the realized projects on introduction of the automated systems in the companies from various fields of activity. The main stages of the design direction in the sphere of automation of business – processes are presented in this work, as well as the features of the subject and the characteristics of each stage, documentary objects for realization of each of them. Also on the basis of the carriedout analysis, the authors described a number of the existing shortcomings on realization of the design direction. In view of the data specified in article, the companies will be able to begin the project on automation of their own business effectively and quickly