A.S. Evdokimov1, A.N. Mitroshin2, S.I. Gerashchenko3, V.V. Ryabikov4

1 Research and Production Enterprises “MedEng” (Penza, Russia)
2–4 Penza State University (Penza, Russia)
1 ace1978@mail.ru, 2 an-mitroshin@mail.ru, 3 mpo@list.ru, 4 v.v.ryabikov@gmail.com