提前期为正态分布下的单、双源供应商成本模型

提前期是供应链管理研究中一个重要的内容，有关提前期内需求模型方面的研究层出不穷，但关于提前期本身变化的研究并不多见。本文运用分析每期货物相关成本的方法，推导建立了提前期为正态分布时的单、双源供应商成本模型，然后进行了比较分析。最后，证明了模型最优解的存在，并给出了求解的算法。

Cost Models of Sole and Dual Sourcing in Normal Lead-time

Lead-time is an important part in the study of SCM, and the research into the model of demand in lead-time increases by leaps and bounds, but the research into its own change is rare. This paper uses the method to analyze relevant costs of goods in each period, studies the cost models of sole and dual sourcing when lead-time's distribution is normal, and compares them. Finally, we prove the existence of the optimum and give the arithmetic.