Dennis Cox has been appointed to the newly created position of director and general manager of the consumer products group of AST Research Inc. in Irvine. He will assume responsibility for product definition, marketing, sales and customer support for the Advantage! line of personal computers. Before joining AST, Cox was director of marketing at Packard Bell for three years. He has also held marketing positions with other consumer electronics companies, including Epson America Inc., where he was a product manager, and at Vivitar Inc., where he was director of international operations for photographic products.