Through division of constraint conditions of units into security operation zone and non-security operation zone, a new model for internal economic operation is proposed.

通过划分机组的约束限制条件为安全运行区和非安全运行区，提出了一种基于开关控制策略的厂内经济运行模型。

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The last time I was here, we were embedded in the Green Zone security bubble of the African Union peacekeeping operation at the edge of the Somali capital, with its Ugandan and Burundian troops, its heavy mortars and armoured convoys.

BBC: Welcome to tough, unpredictable Mogadishu