[Retracted] Emergency Management System for Coal Mine Safety Based on IoT Technology

Table 6

Comparison supervision level (input).

Time (year)	2012	2013	2014	2015	2016	2017
Strategy 2	71.2	72.8	75.49	79.50	77.88	80.41
Strategy 1	71.2	74.65	81.47	84.57	98.52	94.07
Initial	71.2	74.21	78.59	85.27	87.56	90.58