In this paper, the reflexed coefficient of potential barrier of period is calculated by the method of character matrix.
应用特征矩阵方法计算周期势垒的反射系数，所得结论与文献结果一致，但计算方法较为简单，并且便于计算机处。
Aiming at the mechanism character of a multi axes robot the location kinematics negative problem was solved by simple Descartes geometry instead of general matrix transform.
针对一个教学型多关节机器人的机械特点，不用一般的齐次转换的方法而是用简单的笛卡儿几何的方法解决了其运动学逆问题。
A robust stability boundary of uncertain singular systems is proposed by utilizing singular value decomposition and the character of mode matrix.
并利用奇异值分解方法和模矩阵的性质，给出了使不确定广义系统鲁棒稳定的一个鲁棒界。
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