通过粗糙隶属度函数，将粗集理论与模糊理论联系起来，建立一种粗集理论与模糊理论的关系。
In this paper, we combine the fuzzy set theory with rough set theory by rough membership function and establish a relation between them.
针对给定条件的并联系统建立了系统可靠度与系统费用的模糊综合优化模型。
The comprehensive optimization model for system reliability and system cost was set up for a parallel system under given conditions.
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