我们已经研究了分别具椭圆和双曲不动点的二维保测度映射及其受摄三维扩张的KS熵。
We have studied the KS entropy of a 2-dimensional measure-preserving mapping with an elliptic or hyperbolic fixed point respectively, as well as that of its 3-dimensional extension.
首先，利用坐标变换将机器人在三维空间中的运动映射到二维平面上；
The coordinate transformation is used to translate the motion of 3D environment into a plane.
构造了虚拟工作平面与垂直工作平面，解决了二维手势向三维手势的映射问题。
Horizontal_plane and vertical_plane are constructed to resolve the problem of space mapping from 2d to 3d.
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