Method for avoiding or limiting early build due to yield decreases
First Claim
1. A production planning method comprising:
- predicting, by a computer, a first yield for a product during a first time period and a second yield for said product during a second time period, wherein said first time period is earlier than said second time period;
running, by said computer, a production planning program to develop a first plan for producing said product;
evaluating, by said computer, said first plan to determine if said first plan comprises producing a predetermined quantity of said product in said first time period, when said predetermined quantity is to be consumed during said second time period;
if said first plan comprises producing said predetermined quantity in said first time period, adding, by said computer, a constraint and an additional decision variable into said production planning program; and
re-running, by said computer, said production planning program with said constraint and said additional decision variable to develop a second plan for producing said product, said constraint and said additional decision variable ensuring that, in said second plan, said predetermined quantity of said product is allowed to be produced earlier than said second time period, but only with said second yield.
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Abstract
Disclosed are embodiments of an improved production planning method that avoids or limits early builds. The method comprises running a conventional production planning program using standard inputs (e.g., date effective yields). The outputs of the program (e.g., a plan including planned inventory overstocks at given times) are evaluated to determine if the program plans an early build and if the planned early build may have been triggered by a predicted decrease in yield. If an early build is planned and if a correlation exists between the decrease in yield and the early build, then, optionally, new constraints are added into the program and the program is re-run so that the early build is either avoided or limited to that of the proper yield. Thus, the method can be used to reduce early builds due to an incorrect, nominally higher, yield without requiring the user to provide any special additional input data.
30 Citations
13 Claims
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1. A production planning method comprising:
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predicting, by a computer, a first yield for a product during a first time period and a second yield for said product during a second time period, wherein said first time period is earlier than said second time period; running, by said computer, a production planning program to develop a first plan for producing said product; evaluating, by said computer, said first plan to determine if said first plan comprises producing a predetermined quantity of said product in said first time period, when said predetermined quantity is to be consumed during said second time period; if said first plan comprises producing said predetermined quantity in said first time period, adding, by said computer, a constraint and an additional decision variable into said production planning program; and re-running, by said computer, said production planning program with said constraint and said additional decision variable to develop a second plan for producing said product, said constraint and said additional decision variable ensuring that, in said second plan, said predetermined quantity of said product is allowed to be produced earlier than said second time period, but only with said second yield. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A program storage device readable by computer and tangibly embodying a program of instructions executable by said computer to perform a production planning method, said method comprising:
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predicting a first yield for a product during a first time period and a second yield for said product during a second time period, wherein said first time period is earlier than said second time period; running a production planning program to develop a first plan for producing said product; evaluating said first plan to determine if said first plan comprises producing a predetermined quantity of said product in said first time period, when said predetermined quantity is to be consumed during said second time period; if said first plan comprises producing said predetermined quantity in said first time period, adding at least a constraint into said production planning program; and re-running said production planning program with said constraint to develop a second plan for producing said product, said constraint ensuring one of the following; that, in said second plan, said predetermined quantity of said product is not to be produced earlier than said second time period; and that, in said second plan, said predetermined quantity of said product is allowed to be produced earlier than said second time period, but only with said second yield. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification