Boots – shoes – and leggings
Patent
1997-05-21
1998-11-24
Trammell, James P.
Boots, shoes, and leggings
36446805, 36446806, 36446807, 36446808, 705 7, 705 8, G06F 1900, G06G 766
Patent
active
058416773
ABSTRACT:
A lot dispatching method and apparatus for dispatching WIP lots in the manufacture of semiconductor integrated circuits includes determining an average process time (T) and average number of lots per batch (a) of a succeeding process, and determining allowable lots (k) of a preceding process. The allowable lots (k) is equal to the preceding lots (m) undergoing the preceding process to the extent that the sum of (m) and the lots waiting to undergo the succeeding process (n) is not greater than the maximum batch size of the succeeding process. An allowable waiting time is then determined in accordance with a lot waiting rule, where the allowable waiting time represents the average time for processing the number of additional lots to be gained by waiting for the preceding process to complete. The allowable waiting time is determined by the equation k(T/a). If the expected waiting time for the preceding process to complete is greater than the determined allowable waiting time, the WIP lots (n) are immediately processed in the succeeding process; otherwise, the (n) WIP lots are not dispatched until the allowable lots (k) of the preceding process arrive, which are then combined into a single batch and dispatched into the succeeding process.
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Chu Harry L.
Yang Terry H.
Bui Bryan
Taiwan Semiconductor Manufacturing Co. Ltd.
Trammell James P.
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