Pedagogical dialogue is not only a kind of pedagogical method, relationship and recognitive style but a spirit.

教学对话不单是一种教学方法、教学关系和教学认知方式，而是一种教学精神。

It also builds systematic dynamics model to illustrate the relationship and function of key factors in recognitive process by analysis on the organization learning process.

并通过对组织学习过程的系统动力学分析，建立组织学习过程的系统动力学模型，重点描述认知过程中主体之间的相互关系和各因素的作用。

In this paper, the method for the optimal gray threshold is given, which is based on the maximum class separation distance criterion of pattern recognitive decision theory.

利用基于模式识别决策理论的最大类间距准则，给出了求解最佳分割灰度门限的方法。