A Class of Numerical Algorithm for Impact Degree Assessment of Emergency Systems

Table 2

Functions of impact path.

Evolution paths	Time scope	Functions
Rising stage	0,𝑇1	𝜂=𝑎𝑡^𝑏+𝑐  (𝑏>1)
Recession stage	𝑇1,𝑇𝑛	𝜂=𝑎𝑒^𝑏𝑡+𝑐  (𝑏<0)