Manufacturers produce parts according to the PO from the
warehouse and deliver goods to the warehouse for replenishment. There are three operators in receiving dock executing receiving operation. When purchased goods are
delivered, operators conduct first phase check for the quantity and item identification numbers.The entire batch of goods are rejected, if either quantity or identification number
does not meet the order requirement. If these goods are in
compliance with order requirements, they would be moved to
a temporary area and wait for the next phase technical inspection of specifications by superiors. Once passing the specification inspection, the goods are accepted and put away into
storage area. Currently, warehouse operators need to sequentially scan the bar code on each part in order to confirm the
type and quantity. They also need to key in the data into the
local WMS and key in these data again to the superior’s
information system to update the inventory level. With the
update from the superior’s information system, the superiors
need to personally come to the distribution center to confirm
the product specification. The receiving and storage processes
are shown in Fig. 3. The duration of working time of receiving
and storage processes depend on the quality and quantity of
the delivery order, the time for bar code scanning (that depends on the operator skill), the quantity of data to WMS, the
transportation time of parts from receiving station to storage
racks, the time to load the parts to racks, and mostly the time
waiting for superiors to inspect and approve the specification