A.N. Pylkin - Dr.Sci. (Eng.), Professor, Dean of Computer Science Faculty, Head of Department of Calculus and Applied Mathematics, Ryazan State Radio Engineering University. E-mail: Pylkin.a.n@rsreu.ru S.V. Filatkin - Leading Engineer, Post-graduate Student of Department of Calculus and Applied Mathematics, Ryazan State Radio Engineering University. E-mail: svfi@yandex.ru