Weyl group extension of quantized current algebras

In this paper, we extend Drinfeld's current realization of quantum affine a lgebras U-q((g) over cap) and of the Yangians in several directions: we con struct current operators for non-simple roots of g, define a new braid grou p action in terms of the current operators, and describe the universal R-ma trix for the corresponding "Drinfeld" comultiplication in the forms of an i nfinite product and of certain integrals over current operators.