Covid19-pandemic has had a profound impact on the way we live and social reality in world around us. Except for enormous strain public health of individuals, it affected functioning to great extent, at least temporarily. It sped up digitalization forced activities transfer digital realm an unprecedented level. simultaenously confined actors their geographical localities. In all this, offered op...

in this paper the problem of minimizing the total transmitting power subject to a fixedtotal bit rate in ofdm systems is considered. upper bounds on transmitting power and bit rate ofeach subcarrier can also be taken into account. in practice, the number of bits of each subcarriershould be integer and nonnegative. in this paper an analytical optimal solution is derived for thecase of assuming t...

the square map is one of the functions used in cryptography. for instance, the square map is used in rabin encryption scheme, block cipher rc6 and stream cipher rabbit, in different forms. in this paper, we study statistical properties of the output of the square map as a vectorial boolean function. we obtain the joint probability distribution of arbitrary number of the upper and the lower bits...