In this paper, the model of the standby maintenance system which is with two units under human failures is studied.

研究人为故障下两部件备用可修复系统的模型。

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As we discussed today, this ongoing review continues to reveal more about the human and systemic failures that almost cost nearly 300 lives.

WHITEHOUSE: President Obama Speaks to the Press After Security Meeting

But what already is apparent is that there was a mix of human and systemic failures that contributed to this potential catastrophic breach of security.

WHITEHOUSE: President Obama Updates the Press in Hawaii

Add to this human error and other failures inherent in war, and the outcome becomes unclear.

FORBES: How A Libyan No-Fly Zone Could Backfire