Assumptions
(1) Departmental areas are fixed for each period but may vary
from one period to another [33].
(2) For departments in all periods, lit is used to show the distance
parallel to the X axis, and wit is used to show the distance
parallel to the Y axis.
(3) The transportation costs to transport materials per unit distance
between departments are regarded as fuzzy random
variables.
(4) For each facility assignment to a candidate department, the
rearrangement cost is different.