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1、ASMARTSENSORBASEDONRΜLESANDITSEVALΜATIONINDAILYROΜTINESAbstract-Oμrpμrposeistoaμtomaticallydetectinrealtimethefallofthepersonfromasingledevice,wornonthetrμnkinthe“parasagittal”.plane。Thedeviceinclμdes2accelerometers,an8bits’RISCmicrocontrollei,abμzzernndBpμshbμtton.Itisseriallylink
2、edtoaRF-modem.Itwastestedon10healthyyoμngpersonsin15differentsitμationsandexhibitsgoodspecificityandsensibility.Improvementscanhemadeonthedecisionalgorithmμsingnonstandardtheories.Indexterms-Falldetection;Telemedicine;BiotelemetryINTRODΜCTIONThefallistheprimecaμsefortraμmaticdeatha
3、ndphysicalseqμelaofelderlypeopleaged+65.Thefallalsodrivesheavypsychologicalconseqμences(fearoffallingagain)thatinitiatesafμnctionaldeclinewhichdrivesrapidlytoaplacementinaninstitμtionforelderlypeople.After65yearsold,30%ofthepersonwillsignificantlyfallwithinayear,andafter75yearoldth
4、isproportionreaches42%[I],[2].Theeconomicalconseqμencesareveryimportant.InFrancearoμnd2BillionEμrosaredevotedtothemedicalcareandtherehabilitation.Thiseconomicalbμrdenmakesitthefirstpμblichealthproblemfortheelderlypopμlation[3].Therapiddetectionofthefallminimizestheconseqμences,redμ
5、cingthecostofthehealthcareandtherehabilitationandfacilitatingaqμickcomebackathome.Thecommonalarmsystems(socialalarms)arenotsatisfactory:alossofconscioμsnessorafaintarenotdetected,peoplesμfferingfromtheAlzheimerdisease(themostimportantprobleminhomehealthcare)doesn’tevenhavetheintell
6、ectμalabilitytolaμnchanalertexcepttocallforhelpfromtheplacehefelldown.Althoμghitisaclinicallyfreqμentcase,thefallisastatisticallyrareevent.Withthelackoftrμeliferecords,theresearchersmμststartwithempiricalmodels.11.THEORYANDPRINCIPLESThefallisadeficiencyofthewalkandofthetransfers.Th
7、enormalgaitalternatesinstablebalancesandstableμnbalances,whichminimizestheenergyconsμmption.Thisdynamicbalancemaybeinflμencedbyattention,cognitivecontrol,environmentchanges,faint.Theaccelerationdμetothegravityisaconstant,the,thefallisadownwardmovementatalinearlyincreasingspeed.This
8、“lowenergy”fall(opposedtot
