South Korean President Park Geun-hye is set to deliver a speech on North Korea in the former East German city of Dresden on Friday amid expectations the address would crystallize her vision for unification with the communist nation. Park was scheduled to make the speech at the Dresden University of Technology after receiving an honorary doctorate from the school. Speculation has been rife that Park could unveil a new vision for unification with North Korea that could be called either the "Dresden Declaration" or "Unification Doctrine."    Officials declined to discuss details of the planned address. But it is expected to be largely a proposal that South Korea will provide the impoverished North with a comprehensive package of economic assistance if Pyongyang abandons its nuclear program.