第二章 引言如同手动工具是手的延长一样,计算机常常被认为是人脑功能的延长。按照这种机器与人的类比,物理测量装置(光电池、压力敏感开关等)便是感觉器官的感觉单元(Sensory Cells),而从它们那里接受信息的计算机则是起知觉器官的作用了。在许多利用这种类比的应用中(例如,过程控制),计算机只表现出感觉和反射的功能。 Chapter 2 INTRODUCTION Just as a hand tool is a hand extension, a computer is often regarded as an extension of human brain function. According to this machine-to-human analogy, physical measuring devices (photocell, pressure-sensitive switch, etc.) are the sensory cells of sensory organs, whereas the computers that receive the information from them act as sensory organs. In many applications that make use of this analogy (eg, process control), the computer only exhibits sensory and reflexive functions.