Yang Ge One was a fatherly mentor figure, the other a brash wunderkind. This tale of two industry veterans, whose clash at the top of Semiconductor Manufacturing International Corp. (SMIC) made headlines earlier this month, could well summarize the difficult situation China's leading microchip-maker faces as it stands at a crossroads in its brief history. Founded just 20 years ago, SMIC had once hoped to become one of the world's leading