【Key words】 Project logistics； Multimode transportation； Transportation modes selection； Decision Network Planning；
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At last, it studies the fuzzy duration-cost optimization of decision network planning.
最后，对模糊决策网络计划工期—成本优化方法进行了探讨。
Decision network planning as one of the network planning also meets the problem that the duration can't be confirmed accurately.
决策网络计划技术作为网络计划技术中的一种，也会遇到工期无法准确确定的问题。
This dissertation studied the existent problem of decision network planning based on fuzzy theory. The main research work is as follows.
本文基于模糊理论对决策网络计划存在的问题从以下几个方面进行了探讨。
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