供應(yīng)鏈管理環(huán)境下的生產(chǎn)計(jì)劃(文件)
【正文】 00Ht +500Lt + 6Ot + 2It + 5St + 30Ct + 10Pt }It1 + Pt + Ct = Dt + St1 + It StWith I0=1000, S0=0, S6=0 I6 ?500, W0 = 80 Wt = Wt1 + Ht – Lt Pt ? 40Wt + Ot/4 for t=1, 2, …, 6Ot ? 10Wt for t=1, 2, …,6Period Hired Ht LayoffLtWorkforce W tOvertime OtInventory ItStockout StSubcontract CtTotal Prod Pt0 0 0 80 0 1000 0 01 0 15 65 0 1983 0 0 25832 0 0 65 0 1567 0 0 25833 0 0 65 0 950 0 0 25834 0 0 65 0 0 267 0 25835 0 0 65 0 117 0 0 25836 0 0 65 0 500 0 0 2583The total cost of is $422275 如果我們假定 t期的平均庫(kù)存量為最初和最終庫(kù)存的平均值，即 (It1+It)/2，則 計(jì)劃期內(nèi)的平均庫(kù)存 ：Little’s law : 平均周轉(zhuǎn)時(shí)間平均周轉(zhuǎn)時(shí)間 =平均庫(kù)存平均庫(kù)存 /生產(chǎn)能力生產(chǎn)能力故，計(jì)劃期內(nèi)的平均季節(jié)性庫(kù)存 =895故，計(jì)劃期內(nèi)的平均周轉(zhuǎn)時(shí)間 = 月靈敏度分析? 增加需求波動(dòng) (，總需求 16000個(gè)單位 )? 增加庫(kù)存成本 (從 $2 增加到 $6)? 加班成本降到 $ /小時(shí)? ……Period Hired Layoff Workforce Overtime Inventory Stockout Subcontract Total Prod. 0 0 0 80 0 1000 0 0 1 0 15 65 0 2583 0 0 2583 2 0 0 65 0 2167 0 0 2583 3 0 0 65 0 950 0 0 2583 4 0 0 65 0 0 1267 0 2583 5 0 0 65 0 90 683 0 2583 6 0 0 65 0 500 0 0 2583The total cost of meeting the new demand pattern is $432858 Results: the seasonal fluctuation of demand leads to an increase in either Inventory or backlogs as well as an increase in the total cost of SC. Synchronization of supply and demand bees more difficult. Increased demand fluctuationIncrease in holding cost (from $2 to $6, Refer to Example)Period Hired Layoff Workforce Overtime Inventory Stockout Subcontract Total Prod. 0 0 0 80 0 1000 0 0 1 0 23 57 0 1667 0 0 2267 2 0 0 57 0 933 0 0 2267 3 0 0 57 0 0 0 0 2267 4 0 0 57 0
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