Achecksumisanalgorithmthatscansapacketofdataandreturnsasinglenumber.Theideaisthatifthepacketischanged,thechecksumwillalsochange,sochecksumsareoftenusedfordetectingtransmissionerrors,validatingdocumentcontents,andinmanyothersituationswhereitisnecessarytodetectundesirablechangesindata.Forthisproblem,youwillimplementachecksumalgorithmcalledQuicksum.AQuicksumpacketallowsonlyuppercaselettersandspaces.Italwaysbeginsandendswithanuppercaseletter.Otherwise,spacesandletterscanoccurinanycombination,includingconsecutivespaces.AQuicksumisthesumoftheproductsofeachcharacter'spositioninthepackettimesthecharacter'svalue.Aspacehasavalueofzero,whilelettershaveavalueequaltotheirpositioninthealphabet.So,A=1,B=2,etc.,throughZ=26.HereareexampleQuicksumcalculationsforthepackets"ACM"and"MIDCENTRAL":ACM:1*1+2*3+3*13=46MIDCENTRAL:1*13+2*9+3*4+4*0+5*3+6*5+7*14+8*20+9*18+10*1+11*12=650InputTheinputconsistsofoneormorepacketsfollowedbyalinecontainingonly#thatsignalstheendoftheinput.Eachpacketisonalinebyitself,doesnotbeginorendwithaspace,andcontainsfrom1to255characters.OutputForeachpacket,outputitsQuicksumonaseparatelineintheoutput.SampleInputACMMIDCENTRALREGIONALPROGRAMMINGCONTESTACNACMABCBBC#SampleOutput46650469049751415

LayeredForm：支持窗体动画特效，透明，可以和LayeredControl实现任意透明效果等。
。
。
包含LayeredWindowForm的功能支持一部分带有Paint事件的普通控件，但是不能实现普通控件的背景透明效果！控件类：ControlsHotKey：支持全局热键绑定，事件驱动，可以开启和关闭LayeredButton：按钮控件，支持按钮颜色设置，图片按钮，如果只设置一张正常状态下的按钮图片，则有鼠标移入加亮效果和鼠标按下变暗效果。
边框设置，文字效果设置。
LayeredCheckButton：对LayeredButton的扩展，支持状态切换。
LayeredDragBar：支持对父容器的尺寸拖拽调整LayeredFlashBox：支持透明Flash播放（当前版本不可用，请勿使用！）LayeredLabel：对文字的显示，文字效果设置LayeredListBox：支自定义列表项目，支持横向和纵向滚动，支持平滑滚动。
LayeredPanel：在Layered模式下的容器控件LayeredPictureBox：支持Gif播放，支持多张图片合成动画播放。
播放Gif时候不要频繁暂停和播放动画，容易导致线程阻塞。
LayeredTextBox：Layered模式下的文本编辑器。
支持水印文字设置LayeredTrackBar：进度条控件，支持图片进度条定义动画类：Animations通过设置LayeredForm的Animation.Effect属性来定义窗体动画特效。
包含了以下特效类：BlindWindowEffect、FadeinFadeoutEffect、GradualCurtainEffect、LevelScrollEffect、RandomCurtainEffect、RotateZoomEffect、ThreeDTurn、ZoomEffect可以通过实现IEffects接口来实现自定义特效DirectUI类：DirectUI包含几个DirectUI控件。
用于对以上控件的扩展和美化。
部分LayeredControl包含DUIControl属性可以向其添加DirectUI控件。
支持通过集合编辑器里面添加，只是不能在集合编辑器里面绑定事件，需要手动写代码绑定。
通过集合编辑器添加的控件不一定能马上在设计器里看到效果，因为会有图像缓存，可能需要尝试调整控件大小等方式强制控件重绘，就可以看到效果了。
LayeredControl可以支持在普通窗体上使用。

StochasticCalculusforFinanceI:TheBinomialAssetPricingModel(SpringerFinance)(Paperback)byStevenE.Shreve(Author)BookDescriptionStochasticCalculusforFinanceevolvedfromthefirsttenyearsoftheCarnegieMellonProfessionalMaster'sprograminComputationalFinance.Thecontentofthisbookhasbeenusedsuccessfullywithstudentswhosemathematicsbackgroundconsistsofcalculusandcalculus-basedprobability.Thetextgivesbothprecisestatementsofresults,plausibilityarguments,andevensomeproofs,butmoreimportantlyintuitiveexplanationsdevelopedandrefinethroughclassroomexperiencewiththismaterialareprovided.Thebookincludesaself-containedtreatmentoftheprobabilitytheoryneededforstochasticcalculus,includingBrownianmotionanditsproperties.Advancedtopicsincludeforeignexchangemodels,forwardmeasures,andjump-diffusionprocesses.Thisbookisbeingpublishedintwovolumes.Thefirstvolumepresentsthebinomialasset-pricingmodelprimarilyasavehicleforintroducinginthesimplesettingtheconceptsneededforthecontinuous-timetheoryinthesecondvolume.Chaptersummariesanddetailedillustrationsareincluded.Classroomtestedexercisesconcludeeverychapter.Someoftheseextendthetheoryandothersaredrawnfrompracticalproblemsinquantitativefinance.AdvancedundergraduatesandMasterslevelstudentsinmathematicalfinanceandfinancialengineeringwillfindthisbookuseful.StevenE.ShreveisCo-FounderoftheCarnegieMellonMSPrograminComputationalFinanceandwinneroftheCarnegieMellonDohertyPrizeforsustainedcontributionstoeducation.Publisher:Springer;1edition(June28,2005)Language:EnglishISBN-10:0387249680ISBN-13:978-0387249681

STEP7BasicProfessionalandWinCCProfessional含15.1plcsim，内附免狗补丁，亲测使用！

本书主要介绍了在移动通信领域常用的矩阵论的知识，很有针对性，看后很有帮助。

NFSbetweenVxWorksandWindowsXP

ReactNativehelpsdevelopersreusecodeacrossdifferentmobileplatformslikeiOSandAndroid.ThisbookwillshowyoueffectivedesignpatternsintheReactNativeworldandwillmakeyoureadyforprofessionaldevelopmentinbigteams.ThebookwillfocusonlyonthepatternsthatarerelevanttoJavaScript,ECMAScript,ReactandReactNative.However,youcansuccessfullytransferalotoftheskillsandtechniquestootherlanguages.Icallthem“Ideapatterns”.ThisbookwillstartwiththemoststandarddevelopmentpatternsinReactlikecomponentbuildingpatterns,stylingpatternsinReactNativeandthenextendthesepatternstoyourmobileapplicationusingrealworldpracticalexamples.Eachchaptercomeswithfull,separatesourcecodeofapplicationsthatyoucanbuildandrunonyourphone.Thebookisalsodivingintoarchitecturalpatterns.EspeciallyhowtoadaptMVCtoReactenvironment.YouwilllearnFluxarchitectureandhowReduxisimplementingit.Eachapproachwillbepresentedwithitsprosandcons.YouwilllearnhowtoworkwithexternaldatasourcesusinglibrarieslikeReduxthunkandReduxSaga.

GeneralDescriptionTheMAX96705isacompactserializerwithfeaturesespeciallysuitedforautomotivecameraapplications.ItisfunctionandpincompatiblewiththeMAX9271.Inhighbandwidthmode,theparallel-clockmaximumis116MHzfor12-bitlinearorcombinedHDRdatatypes.Theembeddedcontrolchanneloperatesat9.6kbpsto1MbpsinUART,I2C,andmixedUART/I2Cmodes,allowingprogrammingofserializer,deserializer,andcameraregistersindependentofvideotiming.Fordrivinglongercables,theIChasprogrammablepre/deemphasis.Programmablespreadspectrumisavailableontheserialoutput.TheserialoutputmeetsISO10605andIEC61000-4-2ESDstandards.Thecoresupplyrangeis1.7Vto1.9V,andtheI/Osupplyrangeis1.7Vto3.6V.TheMAX96705isavailableina32-pin(5mmx5mm)TQFNpackagewith0.5mmleadpitch,andoperatesoverthe-40°Cto+115°Ctemperaturerange

RF系统设计，PCB阻抗计算WhatisAppCAD?“AppCADisaneasy-to-useprogramthatprovidesyouwithauniquesuiteofRFdesigntoolsandcomputerizedApplicationNotestomakeyourwirelessdesignjobfasterandeasier.AppCAD'sunique,interactiveapproachmakesengineeringcalculationsquickandeasyformanyRF,microwave,andwirelessapplications.AppCADisusefulforthedesignandanalysisofmanycircuits,signals,andsystemsusingproductsfromdiscretetransistorsanddiodestoSiliconandGaAsintegratedcircuits.ThekeywordforAppCADiseasy-nocircuitfiles,nomanuals-justquickandeasy.“

5GNR:Architecture,Technology,Implementation,andOperationof3GPPNewRadioStandardsisanin-depth,systematic,technicalreferenceon3GPP'sNewRadiostandards(Release15andbeyond),coveringtheunderlyingtheory,functionaldescriptions,practicalconsiderationsandimplementationofthe5Gnewradioaccesstechnology.Thebookdescribesthedesignandoperationofindividualcomponentsandshowshowtheyareintegratedintotheoverallsystemandoperatefromasystemsperspective.Uniquely,thisbookgivesdetailedinformationonRANprotocollayers,transport,networkarchitectureandservices,aswellaspracticalimplementationanddeploymentissues,makingitsuitableforresearchersandengineerswhoaredesigninganddeveloping5Gsystems.Reflectingontheauthor's30plusyearsofexperienceinsignalprocessing,microelectronicsandwirelesscommunicationsystemdesign,thisbookisidealforprofessionalengineers,researchersandgraduatestudentsworkingandresearchingincellularcommunicationsystemsandprotocolsaswellasmobilebroadbandwirelessstandards.Strongfocusonpracticalconsiderations,implementationanddeploymentissuesTakesatop-downapproachtoexplainsystemoperationandfunctionalinterconnectionCoversallfunctionalcomponents,features,andinterfacesbasedonclearprotocolstructureandblockdiagramsDescribesRFandtransceiverdesignconsiderationsinsub-6GHzandmmWavebandsCoversnetworkslicing,SDN/NFV/MECnetworksandcloudandvirtualizedRANarchitecturesComprehensivecoverageofNRmulti-antennatechniquesandbeamformedoperationAconsistentandintegratedcoveragereflectingtheauthor’sdecadesofexperienceindeveloping3G,4Gand5Gtechnologiesandwritingtwosuccessfulbooksintheseareas

在日常工作中，钉钉打卡成了我生活中不可或缺的一部分。然而，有时候这个看似简单的任务却给我带来了不少烦恼。 每天早晚，我总是得牢记打开钉钉应用，点击"工作台"，再找到"考勤打卡"进行签到。有时候因为工作忙碌，会忘记打卡，导致考勤异常，影响当月的工作评价。而且，由于我使用的是苹果手机，有时候系统更新后，钉钉的某些功能会出现异常，使得打卡变得更加麻烦。 另外，我的家人使用的是安卓手机，他们也经常抱怨钉钉打卡的繁琐。尤其是对于那些不太熟悉手机操作的长辈来说，每次打卡都是一次挑战。他们总是担心自己会操作失误，导致打卡失败。 为了解决这些烦恼，我开始思考是否可以通过编写一个全自动化脚本来实现钉钉打卡。经过一段时间的摸索和学习，我终于成功编写出了一个适用于苹果和安卓系统的钉钉打卡脚本。