But the precise computation of realistic traffic network reliability is NP difficult, therefore, we need to seek an effective approximate method.
但是现实交通网络可靠性的精确计算是非常难的，为此，需要寻求一个有效的近似算法。
This paper discusses the simple method of heightening exactitude in the case of Fault Tree approximate computation by adding parameter.
在故障树近似计算时，探讨通过加权提高计算准确度的简便方法。
At last, the simulated computation to examine the feasibility of the approximate method is made.
给出了伪试验数和伪成功数的推导公式，最后给出了模拟计算实例，说明该方法可行。
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