简介：AsubsetofSofthevertexsetofagraphGiscalledacyclicifthesubgraphitinducesinGcontainsnocycles.SiscalledanacyclicdominatingsetofGifitisbothacyclicanddominating.Theminimumcardinalityofanacyclicdominatingset,denotedbyγα(G),iscalledtheacyclicdominationnumberofG.S.M.Hedetniemietal.on2000introducedtheconceptofacyclicdominationandposedthefollowingopenproblem:Isγα(G)≤δ(G)foranygraphwhosediameteristwo?Inthispaper,wegiveacounterexamplewhichdisprovestheproblem.

简介：Inrecentyears,therearemanycrimesrelateddrugfraudoccuringinChinaandmanyexpertsthinkthatthemaincauseisthatChinaFoodandDrugAdministration(CFDA)adoptsannouncedinspection(AI).Inordertocircumventthisdifficulty,CFDAhasexploitedunannouncedinspection(UI)since2014.Inthispaper,theauthorsstudytheproblemofwhichoneperformsbetter,AIorUI.Specifically,theauthorsconsiderasupervisor,whichdecidestheinspectionapproach,inspectionstrengthandpunishmenttoforcethefirmtoputself-inspectionefforttomeettherequirementsofGoodManufacturingPractice,andafirm,whichproducesadruganddecidesitsself-inspectioneffort.Theauthorsusegametheorytomodelthisproblem,characterizetheequilibriumpoliciesunderAI,andcomparetheeffectsofthetwoapproachesonpreventingdrugfraudundercompleteandincompleteinformation.Theresultsshowthatunderthecompleteinformation,UIperformsbetterifthefirm'stechnicallevelandtheinspectioncostarelowandAIperformsbetterotherwise.Whenthesupervisordoesn'tknowthefirm'stechnicallevel,ifthelowtechnicallevelishigh,AIperformsbetter.Otherwise,UIperformsbetteriftheinspectioncostislowandAIperformsbetteriftheinspectioncostishigh.

简介：系统的使用试图决定哪个把Mancha放在La的理论是塞凡提斯不能相当在他的通用小说记起其名字的那个，看起来被制定向在Cervantine保持的科学改变某些态度文学。原因：在四世纪文学分析以后，全身的方法论证明了有能力与可接受的精确性识别著名地方。尽管如此，某些合理疑问在文学的严格地科学的分析的适用性附近坚持。考虑到那些疑问，到首先的现在的文章目的采用的全身的途径和它的结果两个都便于评论。