Table 2.

Emergency medical resource distribution decision mathematical notations.

I	A set of supply points, i=1,2,3,.. m;
T	A set of time, one rescue cycle per day
$X_j^t$	The demand satisfaction rate of emergency medical resources in epidemic area j at the moment t
r ij	Vehicle travel distance from supply point i to epidemic area j at the moment t
$P_j^t$	The stock of emergency medical resources that epidemic area j before moment t begins
$X_{j,min}^t$	The lower threshold of requirement satisfaction rate of emergency medical resources in epidemic area j at moment t,0$<X_{j,min}^t<$1
$Q_i^t$	The stock of emergency medical resources at the supply point before moment t begins
${\omega }_j^t$	The degree of urgency in the demand for emergency medical resources in epidemic areas
K	The upper limit of the number of supply points for transporting medical resources to epidemic areas