供應鏈管理課件08-文庫吧資料
2025-01-23 03:49本頁面
【正文】 inty in demand ? Reduce replenishment lead time ? Reduce supply uncertainty or replenishment lead time uncertainty ? Increase reorder frequency or go to continuous review ? 適時采購 ? 采購的均衡化 2/27/2023 20 第四節(jié) 聚集效應對安全庫存的影響 S ys t e m A ( De c e n t r al iz e d ) S ys t e m B ( Ce n t r al iz e d )Wh i ch o f t h e t w o syst em s p ro vi d es a h i g h er l ev el o f servi ce f o r a g i ve n l ev elo f sa f et y st o ck ?),( ? CRCR ),( ? iiR ?????? ??? jikiiCRkiiC jiRR ),cov (2。 ?R = 500 L = 7 days。 ROP = 6,000 ss = ROP RL = 60002500＊ 2=1000 Average Inventory =10,000/2+1000=6000 Cycle service level, CSL = F(RL + ss, RL, ?L) =F(6000,5000,707)=NORMDIST(6000,5000,707,1)= 7075002 ???? RL L ??提示：查表計算 2/27/2023 11 已知補給策略，求產品的供給率 ?ESC is the expected shortage per cycle ?????ROPxdxxfROPxESC )()( )()](1[LsLLssfssFsss??? ???? )0,1,0,/()]1,1,0,/(1[ LLL ssNOR MD ISTssNOR MD ISTss ??? ???? QESCQESCQfr ???? 12/27/2023 12 已知補給策略，求產品的供給率 (例 ) ss = 1,000, Q = 10,000, Fill Rate (fr) = ? ESC = ss{1NORMDIST(ss/?L, 0, 1, 1)} + ??L NORMDIST(ss/?L, 0, 1, 0) = 1,000{1NORMDIST(1,000/707, 0, 1, 1)} + 707 NORMDIST(1,000/707, 0, 1, 0) = fr = (Q ESC)/Q = (10,000 )/10,000 = . Question:Q=20,000,fr=?,CSL=? 2/27/2023 13 五、已知補給周期供給水平和補給率，求安全庫存 Evaluating Safety Inventory Given CSL CSL=P（在貨物交付期 L周中的市場需求量 =RL+ss） ),(1 LLLL RssRFssR ???? ? ),( LLL RssRFCSL ??? 由標準正態(tài)分布，可得 Ls CSLFss ???? )(1CSL )(1 CSLF s ?2/27/2023 14 五、已知補給周期供給水平和補給率，求安全庫存 Evaluating Safety Inventory Given Desired Fill Rate If desired fill rate is fr = , how much safety inventory should be held? ESC = (1 fr)Q = 250,Solve ???????????????????????????σ1250LSLLSssfssFssESC σσ ?????????????????????????? 0,1,1,σσσ1250LLLssNORM DISTssNORM SDISTss2/27/2023 15 五、已知補給周期供給水平和補給率，求安全庫存(續(xù) ) Evaluating Safety Inventory Given Desired Fill Rate Fill Rate Safety Inventory % 67 % 183 % 321 % 499 % 767 2/27/2023 16 六、必備的產品供給能力和不確定性對安全庫存的影響 指定的產品供給水平的提高，必備的安全庫存水平也會隨之提高 安全庫存的邊際增加量隨著產品供給水平的增大而增加 必備的安全庫存水平 ss受到貨物交付期間需求量標準差的影響
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