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模型,即用以描述实际系统的简化表示或其部分属性的模仿(不是全部属性的复制),一般可分为3种形式:(1)形象模型,是系统实体的放大或缩小;(2)模拟模型,是利用一组可控制的条件来代替实体,通过模仿性的试验来了解实体的本质及其变化规律;(3)数学模型,也称符号模型,是用数学表达式来描述实际系统的结构及其变量间的相互
The model, which is used to describe the simplified representation of the actual system or the imitation of some of its attributes (not the duplication of all attributes), can generally be divided into three forms: (1) the image model, which is the enlargement or reduction of the system entity; (2) The simulation model is to use a set of controllable conditions to replace the entity, to understand the nature of the entity and its changing rules through imitation experiments; (3) mathematical model, also known as the symbolic model, is to use mathematical expressions to describe the actual system The structure and its mutual variables