经济实用型计算机化教学环境的建构与实现

A formation and realization of an economized and practical computerized teaching environment

经济基础薄弱、硬件基础设施差、缺乏计算机化的教学环境等因素严重制约着中小学校开展信息技术教育。本文提出了一种性／价比较高的经济实用型计算机化教学环境建构模型，对模型中使用的关键技术──显示器共享分配转换系统（简称ＤＳＵ）进行了介绍，给出了其电路工作原理示意图。基于ＤＳＵ的教学环境具有适应性强、操作简单、经济适用等特点。

The development of IT education in the primary and middle schools is seriously hindered by the weakness of economic basis, the deficiency of hardware basis and the lack of teaching environment of computerization. According to the actual situations in primary and middle schools, this thesis advanced a constructional model of economic and practical teaching of computerization at a favorable rate of function and price. Meanwhile an introduction is made to the key techniques in the application of model, or exactly DSU, and schematic diagram of its circuit's working principles, which are based on the fact that the teaching environment of DSU is of strong adaptability, operational simplicity and economic practicality.