A ring represents a mapping between the names of entities stored on disk and their physical location.
环默示存储在硬盘上的实体名称和物理地位的映射。
2
According to this ring and mapping direction we classify the mapping transformation into two sorts: forward algorithm and reverse algorithm.
依据映射的变换方向不同，论文提出了非均匀映射实现的两类算法：正向算法与反向算法。
3
The properties of the homomorphic images of rough subrings and rough ideals are obtained by discussing the variation of approximation operators under homomorphic mapping in the ring.