计算机系统的发展趋势 》 8不 Mainframe (one computer,many people) PC (one person,one computer) Ubiquitous Computing (one person,many computers) Mainframe Comp. Personal Comp. Ubiquitous Comp. Humans share a ·Personal ·Ubiquitous rare resource ·Direct usage ·Implicit usage ·Usage explicit,use ·User:Everybody. ·User:Everybody well prepared supported by experts User:Experts llxx@ustc.edu.cn 3/87llxx@ustc.edu.cn 3/87 计算机系统的发展趋势