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简介：Adoptingaprincipleof“check-acceptforthefirstrank,inspectionforthesecondrank”,thispaperbrieflydiscussestherationaleofthesamplinginspectionandthesamplinginspectionschemestodigitalproductsinGIS.TheOCcurveisdrawntoexplainthedeficiencyofthepercentsamplinginspection.Meanwhile,themethodofOneTimeLimitingQualityofcountselectionispresentedastheinspectionschemeforproductiondepartmentswhilethemethodofOneTimeAfter-inspectionMeanPercentDefectiveUpperLimitofcountselectionisforacceptancedepartments.

简介：ＣｈｉｎａｔｏＣｏｎｄｕｃｔＯｎｅＰｅｒｃｅｎｔＰｏｐｕｌａｔｉｏｎＳａｍｐｌｉｎｇＳｕｒｖｅｙ￥／／ＣｈｉｎａｗｉｌｌｃｏｎｄｕｃｔａｏｎｅｐｅｒｃｅｎｔｐｏｐｕｌａｔｉｏｎｓａｍｐｌｉｎｇｓｕｒｖｅｙｏｎＯｃｔｏｂｅｒ１，１９９５，ａｃｃｏｒｄｉ...

简介：<正>Aftermorethan2,000yearsofhistoryasatradingcentreandcommu-nicationshubontheBeijing-HangzhouGrandCanal(firstduginthe5thcenturyBC),Huai’anhasacquiredanairofoldmoneyandmellowleisure.Itmustbeoneoffewsmall-sizedcitieswherepeopleareashappytospendtheirleisuretimeinoneofthedozensofopen-airteahousesorrestaurantsbythewaterasinanair-conditionedshoppingmall.

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简介：ThepaperpresentsandprovesanapproximateoptimalrelationshipbetweensamplesizenandacceptancenumbercinthesamplingplansunderimperfectinspectionwhichminimizetheBayesianrisk.TheconclusiongeneralizestheresultobtainedbyA.Haldontheassumptionthattheinspectionisperfect.

简介：1.IntroductionAnimportsnttopicinQualityColltrolisthestudyofacceptancesamplingplan.Foravariablesamplingplan,thequalityofanitemismeasuredbyarandomvariable.Todesignavariablesamplingplanistodeterminethesamplesizeandthespecilicstionlicit(s).Manyschemeshav...

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简介：Onthebasisoftheprinciplesofsimplerandomsampling,thestatisticalmodelofrateofdisfigurement(RD)isputforwardanddescribedindetail.AccordingtothedefinitionofsimplerandomsamplingfortheattributedatainGIS,themeanandvarianceoftheRDarededucedasthecharacteristicvalueofthestatisticalmodelinordertoexplainthefeasibilityoftheaccuracymeasurementoftheattributedatainGISbyusingtheRD.Moreover,onthebasisofthemeanandvarianceoftheRD,thequalityassessmentmethodforattributedataofvectormapsduringthedatacollectingisdiscussed.TheRDspreadgraphisalsodrawntoseewhetherthequalityoftheattributedataisundercontrol.TheRDmodelcansyntheticallyjudgethequalityofattributedata,whichisdifferentfromothermeasurementcoefficientsthatonlydiscussaccuracyofclassification.

简介：Artificialneuralnetworks(ANNs)havebeenwidelyusedasapromisingalternativeapproachforforecasttaskbecauseoftheirseveraldistinguishingfeatures.Inthispaper,weinvestigatetheeffectofdifferentsamplingintervalsonpredictiveperformanceofANNsinforecastingexchangeratetimeseries.Itisshownthatselectionofanappropriatesamplingintervalwouldpermittheneuralnetworktomodeladequatelythefinancialtimeseries.Tooshortortoolongasamplingintervaldoesnotprovidegoodforecastingaccuracy.Inaddition,wediscusstheeffectofforecastinghorizonsandinputnodesonthepredictionperformanceofneuralnetworks.

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简介：InJulyof1987,theSamplingSurveyofChildren’sSituationwasconductedin9provincesautonomousregionsofChina.Astratifiedtwo--stageclustersamplingplanwasdesignedforthesurvey.Thepaperpresentsthemethodsofstratification,selectingn=2PSU’s(cities/counties)withunequalprobabilitieswithoutreplacementineachstratumandselectingresidents/villagecommitteeineachsampledcity/county.Allformulaeofestimatingpopulationcharacteristics(especiallypopulationtotalsandtheratiosoftwototals),andestimatingvariancesofthoseestimatorsaregiven.Finally,weanalysetheprecisionofthesurveypreliminarilyfromtheresultofdataprocessing.

简介：ＣＴＧＵＩＤＥＤＰＥＲＣＵＴＡＮＥＯＵＳＴＲＡＮＳＴＨＯＲＡＣＩＣＦＩＮＥＮＥＥＤＬＥＡＳＰＩＲＡＴＩＯＮＢＩＯＰＳＹＯＦＳＭＡＬＬＰＥＲＩＰＨＥＲＡＬＰＵＬＭＯＮＡＲＹＬＥＳＩＯＮＳＺｈａｎｇＪｕｎ张军ＺｈａｏＨｕｉｒｕ赵惠儒ＦｕＺｈｉｍｉｎ付...

简介：Anewsamplingmethodofambientairanalysisusingcarbonizedfibrousresinasasorbentforpolycyclicaromatichydrocarbons(PAHs)wasreported.Thephysicalandchemicalpropertiesofthecarbonizedfibrousresinsweremeasured.Thesamplepretreatmentwithultrasonicextractionandsubsequentclean-upehitionthroughasilicagelcolumnwasoptimized.Thesuitableultrasonicextractionconditionswereselectedasfollows:resinweightwas1.5g,ultrasonicextractiontime20min,volumeofextractionsolvent100miandextractionoperationtimes2～3.Theconcentratedextractableorganicmatterwassubmittedtonextstepofclean-upprocedureofadsorptionchromatographyonsilicagelcolumn/n-hexaneandamixtureofdichloromethene:n-hexanesolution2:3(v/v).ThePAHsfractionsintherealsamplesfromChangzhou,ChinawereparticularlyanalyzedusingGC-MSdatasystemandthedataofmassspectra,retentiontimesandscannumbersoftherealsampleswerecomparedwiththatofthestandardsof16PAHslistedbytheUSEPAas'prioritypollutants'oftheenvironment.Theanalysisoftherealsamplesindicatesthatthecarbonizedfibrousresinisagoodsorbent.ThepretreatmentofsamplesofambientairwithcarbonizedfibrousresinasasorbentforP,AHsisprovedtobereliableandmightbeusedfortheprocedureofthedeterminationofPAHsinatmosphericenvironment.

简介：Inordertoanalyzetheexperimentalcardiovascularsignalwithhighaccuracy,asystem,integratingreal-timemonitoringandoff-linefurtheranalysis,wasdevelopedandverified.Thedesign,dataprocessingandanalysismethodsaswellastestingresultsaredescribed.With5samplingfrequencychoicesand8channeldataacquisition,thesystemachievedhighperformancesinbeat-to-beatmonitoring,signalprocessingandanalysis.Testswerecarriedouttovalidateitsperformanceinreal-timemonitoring,effectivenessofdigitalfilters,QRSandbloodpressuredetectionreliability,andRR-intervaltimingaccuracy.TheQRSdetectionratewasatleast99.46%fortherecordswithfewnoisesfromMIT-BIHarrhythmiadatabaseusingthealgorithmforreal-timemonitoring,andnolessthan96.43%fortherecordswithsomenoises.Intheconditionthatnoiseamplitudelevelswerelessthan80%,thestandarddeviationsforRR-intervaltimingwerelessthan1mswithageneratedECGcorruptedwithvariousnoisesfromMIT-BmNoiseStressTestDatabase.Besides,thesystemisopenforfunctionexpansiontomeetfurtherstudyspecificneeds.

简介：Ｕｐ－ｔｏ－ｄａｔｅＩｎｆｏｒｍａｔｉｏｎａｂｏｕｔＣｈｉｎａ＇ｓＰｏｐｕｌａｔｉｏｎ：ＭａｊｏｒＦｉｇｕｒｅｓｆｒｏｍ１９９５ＳａｍｐｌｉｎｇＳｕｒｖｅｙＴｈｅＳｔａｔｅＳｔａｔｉｓｔｉｃａｌＢｕｒｅａｕ（ＳＳＢ）ｒｅｌｅａｓｅｄｏｎＦｅｂｒｕａｒ...