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Optimal lot-sizing under learning effect in inspection errors with different types of imperfect quality items

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Abstract

This paper develops four economic order quantity models with different types of imperfect quality items including salvage, repairable, scrap, and reject items. The fraction of imperfect items is assumed to be a random variable. In order to recognize these items, system conducts a full inspection process involving type I and II errors. Recently, many researchers have dealt with human factors in the context of lot-sizing problems due to close them to real manufacturing situations. The inspector's error has considered in many previous studies as a detrimental human factor while ignoring the ability of the inspector to reduce the inspection errors through learning as a constructive human factor. As a result, we also consider learning in inspection errors in our models. We determine the optimal policy for each case separately in order to maximize the total profit. A numerical example is presented to study the impact of learning in inspection errors. Moreover, we investigate the sensitivity of proposed models with respect to the major parameters. Results indicate that learning in inspection error has a significant effect on the profitability. Therefore, it should be regarded to avoid the serious underestimation of profit.

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Authors and Affiliations

  1. Department of Management, Faculty of Humanities, University of Kashan, Kashan, Iran

    Javad Asadkhani

  2. Department of Industrial Engineering, Faculty of Engineering, University of Kashan, Kashan, Iran

    Hadi Mokhtari & Saman Tahmasebpoor

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  1. Javad Asadkhani
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  2. Hadi Mokhtari
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  3. Saman Tahmasebpoor
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Correspondence to Hadi Mokhtari.

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Asadkhani, J., Mokhtari, H. & Tahmasebpoor, S. Optimal lot-sizing under learning effect in inspection errors with different types of imperfect quality items. Oper Res Int J 22, 2631–2665 (2022). https://doi.org/10.1007/s12351-021-00624-7

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  • DOI: https://doi.org/10.1007/s12351-021-00624-7

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