Layered modular theory has been applied widely, but hasn't standard mode.
分层模块化设计思想被广泛应用但缺少标准模式。
Usually, the modular theory is used to study the tangible physical products, we need to innovate it for the China rail restructuring.
由于现有模块化理论大多针对有形的实体产品，但服务产品具有无形性，要研究服务产品的模块化必须深入到其生产运作过程。
To overcome the limitation of ESD on model scale control, this thesis proposes a ESD-based modular theory and studies the method of transformation between ESD and probability influence diagram.
针对ESD模型规模控制方面的局限，提出了基于ESD的模块化原理，研究了ESD与概率影响图的转化方法；
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