Indices
c	IMW generation center
s	IMW storage center
i	IMW FPC
j	IMW MPC
t	outbreaks at different times
Parameters
$GC{W}_c^t$	the amount of IMW produced by IMW generation center c in the time t
$F{C}_i$	fixed operating cost for FPC i
$M{C}_j$	fixed operating cost for MPC j
$S{C}_S$	fixed operating cost for storage center s
$FP{C}_i$	unit processing cost for FPC i
$MP{C}_j$	unit processing cost for MPC j
$SS{C}_s$	unit processing cost for storage center s
$DIC$	cost of disassembly and installation for each mobile processing facility
$PRC$	procurement cost for each mobile processing facility
$mtc$	unit transportation cost using IMW transfer vehicle
$tfc$	unit transportation cost for transferring a mobile processing facility
$DC{S}_{cs}$	distance from IMW generation center c to storage center s
$DS{I}_{si}$	distance from storage center s to FPC i
$DS{J}_{sj}$	distance from storage center s to MPC j
$DJ{J^{\prime }}_{j{j}^{\prime }}$	distance from MPC j’ to MPC j
$SC{A}_s$	maximum capacity of storage center s
$FC{A}_i$	maximum capacity of FPC i
$MCA$	maximum capacity of each mobile processing facility
$MZ$	maximum number of mobile processing facility accommodated in each MPC j
$Pb{A}_s$	risk of infection around storage centers
$Pb{A}_i$	risk of infection around FPCs
$Pb{A}_j$	risk of infection around MPCs
$Pb{A}_t$	risk of infection during transportation
$Pop{S}_{cs}$	population exposure on the route from IMW generation center c to storage center s
$Pop{I}_{si}$	population exposure on the route from storage center s to FPC i
$Pop{J}_{sj}$	population exposure on the route from storage center s to MPC j
$Pop{S}_s$	population exposure around storage center s
$Pop{I}_i$	population exposure around FPC i
$Pop{J}_j$	population exposure around MPC j
$\beta$	upper limit for the storage time of IMW in the storage center
Decision Variables
$X_j^t$	0/1 variable for selection of MPC j in the time t
$Y_i^t$	0/1 variable for selection of FPC i in the time t
$W_s^t$	0/1 variable for selection of storage center s in the time t
$Z_j^t$	the number of mobile processing facilities in the MPC j in the time t
$Z{N}_j^t$	the number of newly acquired mobile processing facilities in MPC j in the time t
$Z{T}_{j{j}^{\prime }}^t$	the number of mobile processing facilities that move from MPC j to MPC j’ at the end of the time t
$V{S}_{cs}^t$	the flow rate of IMW transferred from IMW generation center c to storage center s in the time t
$V{I}_{si}^t$	the flow rate of IMW transferred from storage center s to FPC i in the time t
$V{J}_{sj}^t$	the flow rate of IMW transferred from storage center s to MPC j in the time t