An Improved Genetic Algorithm Based Robust Approach for Stochastic Dynamic Facility Layout Problem

Table 1

Notations.

Indices:
i,j	Indices for facilities where i, j=1,...,I, I= number of facilities in the layout
t	Index for periods where t=1,...,T, T=number of periods in the planning horizon
k,h	Index for locations of facility where k, h=1,...,L, L=number of locations in the layout
z	Indices for transport device types where z=1...,G, G=number of transport device types
Parameters:
Dkh	The distance between location k and location h
Akh	The cost of rearrangement from location k to location h
Pkhz	The cost of transporting unit material from position k to position h using device z
Qtij	The random variable of the total material flow from facility i to facility j in period t
Variables:
xtik	Binary variable:1, if facility i is placed at location k in period t; 0 otherwise
ytzij	Binary variable:1, if using device z to transport material between facility i and facility j during period t; 0 otherwise