The advantages of this system are its flexibility and its powerful functions in cost and benefit analysis . it also has web - based functions which allow employees to submit and retrieve information from the system through a web interface , including e - leave , e - benefits and e - training , and e - allowance claims . it can help to streamline the human capital management process and improve efficiency 富城集团使用的人事管理系统为humancentric system ，此系统由创库系统有限公司研创，其优点在于灵活多变，强于分析及计算成本效益，并能够将人事管理的工作网络化，让员工透过网络介面申请放假，查询福利，报读课程以及申请津贴等，有助于减省工作流程及改善效率。
It is proposed on the basis of the analysis on newton method and the preconditioned conjugate gradient method ( pcg method ) . numerical derivatives can be evaluated by symbolic differ - entiation ( sd ) , finite difference approximation and automatic differelltiation ( ad ) . ad has significant advantages over other two approaches 自动微分是一种新的能精确而有效地计算导数的方法，它优越于传统的微分方法，例如它比符号微分和差分方法的计算成本低，又比差分方法计算精确，自动微分在近几年发展迅速，应用广泛。
