UUID 的目的，是让分布式系统中的所有元素，都能有唯一的辨识资讯-UUID s objective is to allow all the elements of a distributed system, can have a unique identification information

基于系统辨识的最小2乘递推算法。但算法的性能不稳定需要改进-System identification based on minimum 2 by recursive algorithm