Sequential Screening in Semiconductor Manufacturing, II: Exploiting Lot-to-Lot Variability

Jihong Ou and Lawrence M. Wein
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Jihong Ou: National University of Singapore, Singapore
Lawrence M. Wein: Massachusetts Institute of Technology, Cambridge, Massachusetts

Operations Research, 1996, vol. 44, issue 1, 196-205

Abstract: This paper addresses the same quality management problem as Longtin, Wein and Welsch (Longtin, M., L. M. Wein, R. E. Welsch. 1996. Sequential screening in semiconductor manufacturing, I: Exploiting spatial dependence. Opns. Res. 44 173–195.), except that here screening is performed at the wafer level, rather than at the chip level. An empirical Bayes approach is employed: The number of bad chips on a wafer is assumed to be a gamma random variable, where the scale parameter is unknown and varies from lot to lot according to another gamma distribution. We fit the yield model to industrial data and test the optimal policy on these data. The numerical results suggest that screening at the chip level, as in Longtin, Wein and Welsch, is significantly more profitable than screening at the wafer level.

Keywords: inventory/production: probabilistic yield models; probability: Markov random fields (search for similar items in EconPapers)
Date: 1996
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Citations: View citations in EconPapers (4)

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