6Daisuke Umehara, Morikura Masahiro. Influences of periodi-cally switching channels synchronized with power frequency on PLC equipment [ J ]. Journal of Communications, 2009,4 (2) :108-118.
7Junjie Zhang , Zhenfeng Wang, Junbo Sun, et al. Guiming Luo. PLC Modeling and checking based on formal method [ J ]. Scientific Research Publishing Journal, 2010,3 ( 11 ) : 1054-1059.
8Yingfang Li, Keyun Qin, Xingxing He. Robustness of fuzzy connectives and fuzzy reasoning[ J]. Fuzzy Sets and Systems, 2013,225 (16) :93-105.
9K. A. Gopala Rao , B. Amarendra Reddy , P. Durga Bhava- ni. Fuzzy Pi And Integrating type Fuzzy Pid Controllers of Linear , Nonlinear and Time -Delay Systems [ J ]. Interna- tional Journal of Computer Applications, 2010, 1 ( 6 ) : 41 - 47.