  For the current realization of the quantum affine algebras, Drinfeld gave a
simple comultiplication of the quantum current operators. With this
comultiplication, we study the related vertex operators for the case of
$U_q(\hgtsl_n)$ and give an explicit bosonization of these new vertex
operators. We use these vertex operators to construct the quantum current
operators of $U_q(\hgtsl_n)$ and discuss its connection with quantum
boson-fermion correspondence.
