We have proposed the model ofAS/R S with the
rack of modular cells that can hold different size of
unit loads. The mathematical model ofcell size
was also developed considering storage volume for
each load type. Comparison between the previous
model with the rack ofeq ually sized cells and the
proposed new model shows much of difference in
terms ofcapabil ity for coping with a business
environment is changing. To the best ofour
knowledge, an AS/RS with the rack ofmodular
cells is studied first in this paper.