最新西师大版五年级语文贺龙钓鱼ppt课件教学讲义PPT课件.ppt

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1、西师大版五年级语文贺龙钓鱼ppt课件学习目标1.自主学会本课的生字、词语。2.默读课文，并能讲述故事的梗概。3.抓住人物的语言、动作体会贺龙在艰苦岁月里的乐观、幽默。贺龙1960年,毛泽东和贺龙在交谈。作为十大元帅之一，作者为什么不写贺龙驰骋沙场的英姿，却写他钓鱼呢？从“老伙计”、“抚摸”、“会意”中体会贺龙与战马之间的深厚情意以及默契，也说明了钓鱼补充粮食对贺龙来说是常事。为什么说渔竿“凝聚着贺龙对革命必胜的信念，对战友骨肉般的深情厚谊”？这句话是对贺龙的高度赞扬。贺龙在困难面前的乐观、幽默鼓舞着大家，在缺粮少食的境地里对战友的深情厚

2、谊感动着大家。这样的乐观精神在艰苦的革命战争年代有什么作用？这种革命乐观主义精神是红军取得长征胜利的重要因素，鼓舞着大家与恶劣的自然环境、艰苦的生活条件作斗争。1．读了《贺龙钓鱼》的故事，你都想到些了什么呢？说给大家听听。2．课后继续搜集贺龙或其它革命前辈的故事。烟斗牦牛再见TheNewsvendorModel报童模型“Toomuch”and“toolittle”costsCo=overagecostThecostoforderingonemoreunitthanwhatyouwouldhaveorderedhadyouknowndem

3、and.Inotherwords,supposeyouhadleftoverinventory(i.e.,youoverordered).Coistheincreaseinprofityouwouldhaveenjoyedhadyouorderedonefewerunit.Cu=underagecostThecostoforderingonefewerunitthanwhatyouwouldhaveorderedhadyouknowndemand.Inotherwords,supposeyouhadlostsales(i.e.,youun

4、derordered).Cuistheincreaseinprofityouwouldhaveenjoyedhadyouorderedonemoreunit.BalancingtheriskandbenefitoforderingaunitOrderingonemoreunitincreasesthechanceofoverage…ExpectedlossontheQthunit=CoxF(Q)F(Q)=Distributionfunctionofdemand=Prob{Demand<=Q)…butthebenefit/gainoford

5、eringonemoreunitisthereductioninthechanceofunderage:ExpectedgainontheQthunit=Cux(1-F(Q))Asmoreunitsareordered,theexpectedbenefitfromorderingoneunitdecreaseswhiletheexpectedlossoforderingonemoreunitincreases.NewsvendorexpectedprofitmaximizingorderquantityTomaximizeexpected

6、profitorderQunitssothattheexpectedlossontheQthunitequalstheexpectedgainontheQthunit:Rearrangetermsintheaboveequation->TheratioCu/(Co+Cu)iscalledthecriticalratio.（临界比或关键比例）Hence,tomaximizeprofit,chooseQsuchthatwedon’thavelostsales(i.e.,demandisQorlower)withaprobabilitythat

7、equalsthecriticalratioTheNewsvendorModel:Performancemeasures绩效指标NewsvendormodelperformancemeasuresForanyorderquantitywewouldliketoevaluatethefollowingperformancemeasures:Expectedlostsales（期望销售损失）TheaveragenumberofunitsdemandexceedstheorderquantityExpectedsales（期望销售）(com

8、paredtoexpecteddemand)Theaveragenumberofunitssold.Expectedleftoverinventory（期望售后剩余库存）Theaveragen