We need to know what a system does in order to assess its usability. n Standard software engineering formalisms can be used to specify an interactive system. Special interaction models are designed specifically to describe usability properties | Ubiquitous Computing Lecture 28 Topics we shall Cover today Introduction to Ubiquitous Computing History Definition Need Phases Challenges and Researches in Ubiquitous Computing. The Trends in Computing Technology 1970s 1990s Late 1990s Now and Tomorrow ? Pervasive Computing Era Computing Evolution The Major Trends in Computing Mainframe (Past) 1:N one computer shared by many people Personal Computer (Present) 1:1 one computer, one person N:1 *Internet - Widespread Distributed Computing* Ubiquitous Nk:1 Computing 5/14/2020 5:57:10 AM In the past fifty years of computation there have been two great trends in this relationship: the mainframe relationship, and the PC relationship. Today the Internet is carrying us through an era of widespread distributed computing towards the relationship of ubiquitous computing, characterized by deeply imbedding computation in the world. Phase I - The Mainframe Era Computers were a scarce resource run by experts behind closed doors. 5/14/2020 5:57:10 AM The first era we call "mainframe", to recall the relationship people had with computers that were mostly run by experts behind closed doors. Anytime a computer is a scarce resource, and must be negotiated and shared with others, our relationship is that of the mainframe era. /53 Phase II - The PC Era In 1984 the number of people using PCs surpassed that of people using mainframe computers. PC Era: You have your computer, it contains your stuff, and you interact directly and deeply with it. The PC is most analogous to the automobile. 5/14/2020 5:57:10 AM Now we are in the personal computing era, person and machine staring uneasily at each other across the desktop. The second great trend is that of the personal computer. In 1984 the number of people using personal computers surpassed the number of people using shared computers. The personal computer is most analogous to the automobile - a special, relatively expensive item, that . | Ubiquitous Computing Lecture 28 Topics we shall Cover today Introduction to Ubiquitous Computing History Definition Need Phases Challenges and Researches in Ubiquitous Computing. The Trends in Computing Technology 1970s 1990s Late 1990s Now and Tomorrow ? Pervasive Computing Era Computing Evolution The Major Trends in Computing Mainframe (Past) 1:N one computer shared by many people Personal Computer (Present) 1:1 one computer, one person N:1 *Internet - Widespread Distributed Computing* Ubiquitous Nk:1 Computing 5/14/2020 7:07:10 AM In the past fifty years of computation there have been two great trends in this relationship: the mainframe relationship, and the PC relationship. Today the Internet is carrying us through an era of widespread distributed computing towards the relationship of ubiquitous computing, characterized by deeply imbedding computation in the world. Phase I - The Mainframe Era Computers were a scarce resource run by experts .
