V.A. Bereznev - Dr. Sc. (Phys.-Math.), Senior Research Scientist, Dorodnicyn Computing Centre of RAS (Moscow). E-mail: va_bereznev@mail.ru Nguyen Quang Thuong - Dr. Sc. (Eng.), Senior Research Scientist, Dorodnicyn Computing Centre of RAS (Moscow). E-mail: tikhonmos@yahoo.com