| US 7,603,297 B2 | ||
| Inventory management method, system and program | ||
| Tomoyuki Yoshida, Chuo-ku (Japan); Yoshihisa Fujii, Chuo-ku (Japan); and Genichiro Iguchi, Chuo-ku (Japan) | ||
| Assigned to TDK Corporation, Tokyo (Japan) | ||
| Appl. No. 10/529,490 PCT Filed Oct. 07, 2003, PCT No. PCT/JP03/12845 § 371(c)(1), (2), (4) Date Aug. 19, 2005, PCT Pub. No. WO2004/033349, PCT Pub. Date Apr. 22, 2004. |
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| Claims priority of application No. 2002-298410 (JP), filed on Oct. 11, 2002. | ||
| Prior Publication US 2006/0085291 A1, Apr. 20, 2006 | ||
| Int. Cl. G06Q 1/14 (2006.01); G06Q 10/00 (2006.01); G06F 19/00 (2006.01) | ||
| U.S. Cl. 705—28 [705/22; 235/385] | 18 Claims |
| 1. A computer implemented inventory management method for controlling amounts of stocks, the method comprising the steps of:
storing, in a memory, delivery times and quantities of order lots accepted and restock lead times predetermined for every
item;
selecting, with a controller, at least one order lot accepted, having a delivery time within a period from “b” days before
to “a” days after a basic time, from said order lots accepted, to set a threshold value x+yσ1 (where y is equal to or more than 0) based upon both an average x and a standard deviation σ1 of quantities of said selected order lot(s) accepted;
classifying, with the controller, at least one order lot accepted having a quantity α of the selected order lot(s) accepted
as a normal accepted order lot(s), wherein the α is less than or equal to said threshold value; and
calculating, with the controller, a basic stock using a predetermined formula from said classified normal accepted order lot(s),
wherein said calculating the basic stock using the predetermined formula comprises:
calculating an order point “r” and the basic stock β using following equations:
r=cz+mσ4√{square root over (c)}
β=r+tz
where “z” signifies an average shipping quantity per day of an order lot, having a delivery time within a period from the
basic time to “a” days after, of said normal accepted order lot(s), “c” represents the restock lead time, “t” is an order
differential time delay, “m” is equal to or greater than 1, σ4 signifies a standard deviation of shipping quantities per day of order lots accepted, having a delivery time within a period
from “b” days before to the basic time, of said normal accepted order lot(s);
when d+e≤r, where “d” signifies a present amount of a stock and “e” represents a quantities on order, calculating a required
order quantity “f” using an equation f=β−(d+e−cz).
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