Abstract:
The purpose of this study is to build a fuzzy expert system for assessing the financial component of
the economic security of telecommunications enterprises. The methodological basis of the research is founded
on scientific works of domestic and foreign scientists and leading experts in the field of financial analysis and
modeling of economic processes, as well as statistical and financial reporting data that are publicly available. To
construct an integral indicator of the financial security of an enterprise, a fuzzy conclusion is used. Three financial
indicators are used as input variables. The first indicator X1 is the Current Ratio (CR). The second indicator X2 is Equity
Ratio (ER). The third indicator is Return on Assets (ROA). The output variable is defined as an indicator of the financial
security of an enterprise Y123 (FS). Both the input variables and the output variable are converted to fuzziness by
constructing membership functions. The type and parameters of the affiliation function are justified, and the bellshaped
affiliation function is chosen to describe the uncertainty of values that fall under the normal distribution.
The quantity of fuzzy sets at every input is considered as z=3 and the quantity of input variables is considered as
ω=3. To achieve completeness of the model, the quantity of logic rules is considered as r=33=9. To calculate a degree
of market concentration, Mamdani fuzzy conclusion is applied. Defuzzification is engaged to calculate the value
of the output variable Y123(FS) for an indicator that determines the degree of financial security of an enterprise and,
as a result, the degree of its economic security. To assess the level of the financial security indicator of an enterprise,
a fuzzy expert system is constructed. The fuzzy expert system allows you to use various indicators thanks to the
fuzzy logic methodology, which takes into account the fuzziness of input variables and output variables as much as
possible. For the three telecommunications companies whose core business is wireline communication, ratios are
calculated based on financial reports. Financial coefficients are used to determine the integral indicator of financial
security of enterprises. This indicator can be characterized by both numerical values and linguistic terms.
