US corn futures rallied, bouncing on strength in external financial markets and supportive demand outlooks. Concerns about the global economy take a back seat, and that opened the door for a corrective bounce in commodities, with optimistic outlooks for increased export demand helping fuel higher price sentiment, analysts say. Nevertheless, traders say advances were more reflective of oversold technical conditions, overdue for a bounce with bargain hunting by processors and ethanol plants aiding the recovery, analysts add. CBOT Dec corn settled up 17 3/4c at $6.05 1/2/bushel.