E.V. Sergeev, I.S. Mochalov, V.A. Volokhov, A.L. Priorov

A.B. Kislitsyn - Post-graduate Student, Assistant, St. Petersburg State Polytechnical University. E-mail: alexanderkislitcyn@nppntt.ru
A.V. Rashich - Ph. D. (Eng.), Associate Professor, St. Petersburg State Polytechnical University. E-mail: andrey.rashich@gmail.com