More in U.S. Calling for Regime Change by Joo Yong-jung (midway@chosun.com) WASHINGTON - The emphasis of Washington's North Korean policy appears to be shifting gradually toward regime change, as more officials conclude that anything short of that will fail to conclusively solve the nuclear crisis. At the same time, American policymakers are striving to ensure that the North's nuclear ambitions and human rights abuses are high-profile issues. The Republican policy committee in the U.S. Senate recently brought a Japan-based opponent of the Kim Jong Il regime to the United States for a week and introduced him to several high-ranking officials....