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Chiu et al. (2010) [8] present the proof of convexity of the long-run average cost function E[TCU(t 1 )] for a manufacturing system with stochastic breakdown and rework process. This note not only demonstrates that E[TCU(t 1 )] is not convex but also adopts the rigorous methods of mathematics to develop the complete solution procedure to find the optimal solution for removing shortcomings...
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