4Phylipsen G, Blok K, Worrell E. International comparisons of energy efficiency methodologies for the manufacturing industry [ J ]. Energy Polity, 1997,25:715-725.
5Munoz A, Sheng P. An analytical approach for determining the environmental impact of machining processes [ J ]. Journal of Materials Processing Technology, 1995,53 ( 3/ 4) :736-758.
6Gong Yun-qi, Lv Min, Wang Gang, et al. Research on process knowledge management based on ontology [ C ]// Proceedings of IEEE International Conference on Engineering, Services and Knowledge Management. Shanghai: [s. n.] ,2007:5385-5388.
7Lin J, Fox M, Bilgic T. A requirements ontology for concurrent engineering [ J ]. Concurrent Engineering: Research and Applications, 1996,4(4) :279-291.