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...Inventory policies and safety stock optimization for supply chain planning braulio brunaud jose m la nez aguirre pinto ignacio e grossmann carnegie mellon university department of chemical engineering praxair inc may abstract in this paper traditional models are extended to simultaneously optimize the considered r q s policy order units is placed every time level reaches while reviewed predened intervals if found be below an bring back additionally address demand uncertainty four formulations presented proportional throughput with risk pooling eect explicit guaranteed service proposed allow simultaneous reserve base levels tandem material ows evaluated using simulation introduction management a propagation problem last stage distribution nished goods end customers most operations upstream from that driven by action taken customer either walking into store purchase product or placing have delivered since expected normally much smaller than production lead must anticipated through foreca...