Selection of an Appropriate Mechanized Mining Technical Process for Thin Coal Seam Mining

Table 6

Fuzzy expressions of evaluation index.

Number	Attribute value	Flexibility	Maturity	Automation	Management difficulty	Labour intensity	Yager index
VB		Very inflexible	Very immature	Very low	Very hard	Very high	0.933
B		Inflexible	Immature	Low	Hard	High	0.800
W		General	General	General	General	General	0.600
M		Medium	Medium	Medium	Medium	Medium	0.400
G		Flexible	Mature	High	Easy	Low	0.200
VG		Very flexible	Very mature	Very high	Very easy	Very low	0.067