V.R. Krasheninnikov - Dr. Sc. (Eng.), Professor, Head of Department «Applied Mathematics and Informatics», Ulyanovsk State Technical University E-mail: kvr@ulstu.ru A.A. Boitsov - Student, Department «Applied Mathematics and Informatics», Ulyanovsk State Technical University E-mail: boycov_21@mail.ru D.N. Karusev - Student, Department «Applied Mathematics and Informatics», Ulyanovsk State Technical University E-mail: denkarusev@yandex.ru