Abstract
In this article, we investigate the dynamic control problem of a production-inventory system. Here, demands arrive at the production unit according to a Poisson process and are processed in an FCFS manner. The processing time of the customer’s demand is exponentially distributed. Production manufacturers produce items on a make-to-order basis to meet customer demands. The production is run until the inventory level becomes sufficiently large. We assume that the production time of an item follows an exponential distribution and that the amount of time for the produced item to reach the retail shop is negligible. In addition, we assume that no new customer joins the queue when there is void inventory. Moreover, when a customer is waiting in an infinite FIFO queue for service, he/she does not leave the queue even if the inventory is exhausted. This yields an explicit product-form solution for the steady-state probability vector of the system. The optimal policy that minimizes the discounted/average/pathwise average total cost per production is derived using a Markov decision process approach. We find an optimal policy using value/policy iteration algorithms. Numerical examples are discussed to verify the proposed algorithms.
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Acknowledgements
We thank the anonymous referees for their careful reading of our manuscript and suggestions that have greatly improved the presentation. The research work of Chandan Pal is partially supported by SERB, India, Grant MTR/2021/000307, and the research work of Manikandan R, is supported by SERB, India, Grant EEQ/2022/000229.
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Golui, S., Pal, C., Manikandan, R. et al. Optimal control of a dynamic production-inventory system with various cost criteria. Ann Oper Res 337, 75–103 (2024). https://doi.org/10.1007/s10479-023-05716-5
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DOI: https://doi.org/10.1007/s10479-023-05716-5
Keywords
- Production-inventory system
- Controlled Markov chain
- Cost criterion
- Value iteration algorithm
- Policy iteration algorithm