Symbol

Description

Symbol

Description

G

group node

D

distribution node

i

echelon, i = G,D

j

nodes, $j=1,2,3,\cdots ,N$

m

product weight

p

product transportation unit price

c

unit cost

s

transportation distance

d_{e ij}

quantity of online order assigned to echelon i node j

d_{s ij}

quantity of offline order assigned to echelon i node j

q_{e ij}

quantity of online available inventory of echelon i node j

q_{s ij}

quantity of offline available inventory of echelon i node j

TC_ij

total cost of echelon i node j

T

target cost of ench

ST_ij

Service time of echelon i node j

ST

target service time

${\omega }_{ij}^{TC},{\omega }_{ij}^{ST}$

target weight factor of echelon i node j

${\epsilon }_{ij}^{TC},{\epsilon }_{ij}^{ST}$

variable deviation tolerance of echelon i node j