S.V. Ermak - Ph. D. (Phys.-Math.), Associate Professor, St. Petersburg State Polytechnical University. E-mail: vladimir_semenov@mail.ru
R.V. Smolin - Post-graduate Student, JSC «Siemens». E-mail: roman_smolin@inbox.ru
V.V. Semenov - Dr. Sc. (Phys.-Math.), Professor, St. Petersburg State Polytechnical University. E-mail: serge_ermak@mail.ru