Samsung Electronics Co. has replaced the head of its semiconductor arm, appointing a memory chip veteran to spearhead efforts to catch up with SK Hynix Inc. in the booming AI arena.Korea’s largest company named Jun Young Hyun the new leader of its most important business line. He replaced Kyung Kye-hyun, who will head up Samsung’s Advanced Institute of Technology and the future business team. Jun joined the division in 2000 and helped the company develop its basic DRAM and flash memory chips for...