A secrecy rate maximization problem for active reconfigurable intelligent surface (RIS) aided non-orthogonal multiple access networks has been studied in this paper. Assuming that the perfect channel state information is available. we aim to maximize the secrecy rate while satisfying the quality of service of the legitimate users and power budget at the base station and active RIS. Ad... https://www.cosmeticsolutioners.shop/product-category/pore-strips/