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سیاست موجودی بهینه برای سیستم های توانمند با دو منبع تامین

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Optimal inventory policy for capacitated systems with two supply sources

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5. Conclusion

In this paper, we study a periodic review inventory system with two heterogeneous suppliers differentiated by their fixed and variable costs as well as their order size constraints. Our research can be extended in several directions. Based on the properties of strong CK-convexity after Definition 2, our results can be directly extended to the systems with non-stationary fixed costs and order size constraints of supplier L as long as the fixed costs Kn and order size constraints Cn satisfy Kn ≥ αKn−1 and Cn ≤ Cn−1 (n = 1, . . . , N). It can be verified that our results hold for the systems with non-stationary strongly unimodal demand distribution. Our research can be also extended to the infinite horizon systems with finite demand because (i) the optimal cost function for the finite horizon systems with finite demand is uniformly convergent, and (ii) both quasi-convexity and strong CK-convexity are preserved under limit operations.