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1、8ConclusionsandfutureworkInthispaper,wepresentaninnovativeframeworkforefficientlymonitoringWSNs,toachievebothefficiencyandqueryresultquality.Ourframework,coinedKSpot,DistribParallelDatabases(2011)29:113–150147utilizesanoveltop-kqueryprocessingalgorithmwedeveloped,inconjunctionwiththeconceptofin-netw
2、orkviews,inordertominimizethecostofqueryexecution.Inparticular,weformulatetheproblemofconstructingahierarchyofrecursivelydefinedtop-kviews.WethendescribetheMINTViewsalgorithmthatidentifiestheKhighest-rankedanswersefficiently.Wealsopresentastateless,non-materializedversionofMINT,coinedINT(In-NetworkT
3、op-k)Viewsthatisappropriateforsensingdevicewithlimitedmemory.Toillustratetheefficiencyofourframework,wehaveimplementedarealsysteminnesC,whichcombinesthetraditionaladvantagesofdeclarativeacquisitionframeworks,likeTinyDB,withtheideaspresentedinthiswork.Extensivereal-worldtestingandexperimentationwitht
4、racesfromUC-Berkeley,UniversityofWashingtonandIntelResearchBerkeley,showthatKSpotpresentsanupto66%ofenergysavingscomparedtoTinyDB,minimizesboththesizeandnumberofpacketstransmittedontothenetwork(upto77%),prolonginginthatwaythelongevityandhealthofaWSNdeployment.Inthefutureweplantoincorporateanautomate
5、dtransceiveroperationmodulethatwillautomaticallytunethewakingwindowofeachsensordeviceusingapplicationlayersemantics[2,64].Additionally,weplantoinvestigatetheapplicabilityoftheseideasoverMobileSensorNetworksandNetworksofSmartphoneDevices.References1.Agrawal,D.,Ganesan,D.,Sitaraman,R.K.,Diao,Y.,Singh,
6、S.:Lazy-adaptivetree:anoptimizedindexstructureforflashdevices.Proc.VLDBEndow.2(1),361–372(2009)2.Andreou,P.,Zeinalipour-Yazti,D.,Chrysanthis,P.K.,Samaras,G.:Workload-awarequeryroutingtreesinwirelesssensornetworks.In:Proceedingsofthe9thInternationalConferenceonMobileDataManagement(MDM’08),Beijing,Chi
7、na,April27–30,pp.189–196(2008)3.Andreou,P.,Zeinalipour-Yazti,D.,Vassiliadou,M.,Chrysanthis,P.K.,Samaras,G.:KSpot:effectivelymonitoringthekmostimportanteventsinawirelesssensornetwork.In:Proceedingsofth
