A.V. Brovko - Dr.Sc. (Phys.-Math.), Associate Professor, Department of Applied Information Technologies, Yuri Gagarin State Technical University of Saratov (SSTU) E-mail: brovkoav@gmail.com R.S. Pakharev - Post-graduate Student, Department of Applied Information Technologies, Yuri Gagarin State Technical University of Saratov (SSTU) E-mail: ruslanpaharev@rambler.ru