简介:德国音响在发烧友的心目中享有极高的地位,这主要在于器材的设计严谨、工艺精致.声音理性而准确。但同时它们的身价也往往是不菲的.令许多发烧友望而却步。但ELAC(意力)却是一个例外,除了采用ELAC自己研发的4PI蘑菇头的乐魂(SpiritofMusic)与杜斯(DolceVita)由于项级制作、用料豪华而售价颇高外,它的5系列、3系列、200系列等市场中坚系列则具有出色的制作水准与适宜的价格,适合于中高端发烧友使用,而100系列更以物美价廉,配有成系列的中置、环绕音箱而适合于普通家庭及AV发烧友。此外,卫星式的Cirema1、Cinema2、Cinema3等家庭影院音箱更加时尚小巧,更加适合于现代家庭使用,体现出颇强的亲和力。
简介:Thisstudypresentsaclearevolutionofcomputinganditskeyapplications.Cloudcomputingservicesevolvedfromdistributed,grid,andutilitycomputing.CriticalcompaniessuchasSalesforce,Amazon,Google,andMicrosoftplayimportantrolesincloudcomputing.Dramaticchangesinthetechnologyenvironmenthavecreatednewchallengesforcurrentinformationtechnologies.Thisstudydiscussesfoursignificantchallengesforcloudcomputingservices,includingthenext-generationInternet,datasynchronization,cloudsecurity,andcompetitiveadvantages.Andthenitalsodiscusseshowmanagerscanlearnaboutthefutureofcloudcomputingservices.
简介:Thispaperintroducesarobustglobalnonlinearoptimizer-differentialevolution(DE),whichisasimpleevolutionalgorithmtosearchforanoptimaltransformationthatmakesthebestalignmentoftwosetsoffeaturepoints.TomaptheproblemofmatchingintotheframeworkofDE,theobjectivefunctionisproportionaltotheregistrationerrorwhichismeasuredbyHausdorffdistance,whiletheparametersoftransformationareencodedinfloating-pointasthefunctionalvariables.ThreeterminationcriteriaareproposedforDE.Asimulationof2-dimensionalpointsetsandasimilaritytransformationarepresentedtocomparetherobustnessandconvergencepropertiesofDEwithgeneticalgorithm's(GA).AndtheregistrationofanobjectanditscontourmodelhavebeendemonstratedbyusingofDEtonaturalimages.