Gongxu model works as a frame in the construction system of the underground structure group, and then the Gongxu model nodes in this frame are refined to Huodong model.

地下厂房洞室群施工系统以工序模型作为框架，将框架中的模拟工序节点细化为活动模型。

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According to the system models talked above, the system simulation software for the construction of underground structure group is developed using the object-oriented technology.

针对上述系统模型，应用面向对象的开发方法编制了地下厂房洞室群施工系统仿真软件，适用于地下厂房洞室群施工仿真。

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The traffic transportation system of underground structure group is a kind of typical discrete event dynamic system, which is difficult to describe with analytic mathematic models.

地下洞室群的交通运输系统是一种典型的离散事件动态系统，难以用解析方法计算的数学模型来描述。

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International Crisis Group, Horn of Africa analyst Rashid Abdi says al-Shabab has a decentralized leadership structure that has been vulnerable to dissent.

VOA: standard.2009.12.23

But given the loose structure of the group, disclaiming any involvement has proved tricky.

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Prior to yesterday, Son has been pushing for Alipay to be put in a VIE structure that the group would still control.

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For instance, it should be possible to distinguish an insurgency with a rigid command structure from a group of smaller, randomly linked units.

ECONOMIST: Modelling conflict