E.A. Zentsova – Post-graduate Student, Department «Applied Mathematics and Informatics», Ulyanovsk State

Technical University

E-mail: e_zentsova@mail.ru

V.N. Klyachkin – Dr. Sc. (Eng.), Professor, Department «Applied Mathematics and Informatics», Ulyanovsk State

Technical University

E-mail: v_kl@mail.ru