成熟度模型是这样逐步成熟起来的：由较低层的项目分配向下，在经过中间阶段的集中过程之后，到较高层的封闭循环。

The maturity model matures from decentralization of project assignments at the lower level to the close loop at the higher level after undergoing through centralization processes in the middle stages.

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但现阶段他们希望拥有封闭的系统。

But at the moment they do like to have closed systems.

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对封闭型分级单屈服面模型参数中的阶段改变参数和硬化参数的优化进行了研究。

In this paper, optimization of phase change parameter and hardening parameter of closed hierarchical single surface model is studied.

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