Z.M. Yuldashev - Dr. Sc. (Eng.), Professor, Head of the Department of Biotechnical Systems, Saint-Petersburg Electrotechnical University «LETI» E-mail: yuld@mail.ru M.N. Solovev - Post-graduate Student, Department of Biotechnical Systems, Saint-Petersburg Electrotechnical University «LETI»; Engineer, Firm «Diamant» Ltd (St.-Petersburg) E-mail: zenimike@gmail.com

E.G. Geyko¹, I.V. Radysh², V.F. Fedorov³, V.I. Torshin⁴

1–4 Peoples' Friendship University of Russia named after Patrice Lumumba (Moscow, Russia)

3 RNIMU named after N.I. Pirogov Ministry of Health of Russia (Moscow, Russia)

¹ geiko85@mail.ru, ² iradysh@mail.ru, ³ sogdjoy@mail.ru, ⁴ vtorsin@mail.ru