1. East Siberia State University of Technology and Management, Kluchevskaya St. 40V, Ulan-Ude 670013, Russia (Corresponding author), e-mail: i.polyansky@mail.ru, https://orcid.org/0000-0002-7350-8791
2. East Siberia State University of Technology and Management, Kluchevskaya St. 40V, Ulan-Ude 670013, Russia