I.I. Bezukladnikov - Ph.D. (Eng.), Department of Automation and Telemechanics, Perm National Research Polytechnic University. E-mail: corrector@at.pstu.ru
A.V. Gavrilov - Senior Lecturer, Department of Automation and Telemechanics, Perm National Research Polytechnic University. E-mail: gaval@at.pstu.ru