| 摘要 |
<p>The objective of the present invention is to accomplish a dynamic method of computing the order quantities simultaneously taking into account safety stocks and safety times. This is achieved by computing item by item an order quantity, a safety stock and safety time. In the beginning the method determines a plurality of deviations related to forecasts. In addition, correction factors are calculated. The deviations and correction factors can also be computed later when item specific calculations are carried out. Thereafter, the item specific calculations are started. Depending on classification of an item the order quantity is calculated using the Wagner-Whitin algorithm or using the Wilson EOQ formula. After the order quantity has been obtained, a forecast based safety stock, a quantity based safety stock, and safety time will be calculated. Values of the safety stocks are corrected with the correction factors. The effective safety stock for an item is then obtained by summing the corrected safety stocks. A fixed managerial safety stock can also be added to the effective safety stock for taking into account situations where temporary additional buffering is evident. After calculations for all items have been executed, the method gives output data which include order quantity, receipt date, the effective safety stock and safety time.</p> |
