IMPROVING THE EFFICIENCY OF USING THE RESOURCES OF VIRTUAL DATA CENTERS WITH A HETEROGENEOUS STRUCTURE BY REPOSITIONING VIRTUAL MACHINES. - Kravets, O. Ja.; Mutina, E. I.; Zaslavskaya, O. Yu.; Redkin, Yu. V.; Rahman, P. A.; Aksenov, I. A.; Abduladheem Kamil, Kamil Wisam (International Journal on Information Technologies & Security, 2025)