ISO/IEC/IEEE 8802-15-4-2010 信息技术.系统间通讯和信息交换.局域和城域网络.专门要求.第15-4部分:低速率无线个人局域网(WPANs)用无线介质访问控制(MAC)和物理层(PHY)规范
时间:2024-05-17 20:55:17 来源: 标准资料网 作者：标准资料网 阅读：9985
【英文标准名称】:Informationtechnology-Telecommunicationsandinformationexchangebetweensystems-Localandmetropolitanareanetworks-Specificrequirements-Part15-4:Wirelessmediumaccesscontrol(MAC)andphysicallayer(PHY)specificationsforlow-ratewirel
【原文标准名称】:信息技术.系统间通讯和信息交换.局域和城域网络.专门要求.第15-4部分:低速率无线个人局域网(WPANs)用无线介质访问控制(MAC)和物理层(PHY)规范
【标准号】:ISO/IEC/IEEE8802-15-4-2010
【标准状态】:现行
【国别】:国际
【发布日期】:2010-10
【实施或试行日期】:2010-10-15
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/IECJTC1/SC6
【标准类型】:()
【标准水平】:()
【中文主题词】:电路网络;传播过程;数据通信;数据网络;数据处理;数据传送;定义(术语);描述;频率;信息处理;信息技术;接口(数据处理);局部地区网络(LAN);局域网;多路存取计算机;MAN;管理;媒体访问控制;城域网;网络互连;物理层;安全性;无线的;无线个人局域网;WPAN
【英文主题词】:Circuitnetworks;Communicationprocesses;Datacommunication;Datanetwork;Dataprocessing;Datatransfer;Definitions;Descriptions;Frequencies;Informationprocessing;Informationtechnology;Interfaces(dataprocessing);LAN;Localareanetworks;MAC;MAN;Management;Mediumaccesscontrol;Metropolitanareanetworks;Networkinterconnection;Physicallayers;Safety;Wireless;WirelessPersonalAreaNetworks;WPAN
【摘要】:ThescopeofthisrevisionistoproducespecificenhancementsandcorrectionstoIEEEStd802.15.4,allofwhichwillbebackwardscompatiblewithIEEEStd802.15.4-2003.Theseenhancementsandcorrectionsincluderesolvingambiguities,reducingunnecessarycomplexity,increasingflexibilityinsecuritykeyusage,considerationsfornewlyavailablefrequencyallocations,andothers.IEEEStd802.15.4definesthephysicallayer(PHY)andmediumaccesscontrol(MAC)sublayerspecificationsforlow-data-ratewirelessconnectivitywithfixed,portable,andmovingdeviceswithnobatteryorverylimitedbatteryconsumptionrequirementstypicallyoperatinginthepersonaloperatingspace(POS)of10m.Itisforeseenthat,dependingontheapplication,alongerrangeatalowerdataratemaybeanacceptabletradeoff.ItistheintentofthisrevisiontoworktowardalevelofcoexistencewithotherwirelessdevicesinconjunctionwithCoexistenceTaskGroups,suchasIEEE802.15.2andIEEE802.11/ETSI-BRAN/MMAC5GSG.
【中国标准分类号】:L78
【国际标准分类号】:35_110
【页数】:330P.;A4
【正文语种】:英语
【英文标准名称】:Sensoryanalysis-Methodology-Pairedcomparisontest
【原文标准名称】:感官分析.方法学.成对比较试验
【标准号】:ISO5495-2005
【标准状态】:现行
【国别】:国际
【发布日期】:2005-11
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC34
【标准类型】:()
【标准水平】:()
【中文主题词】:比较分析法;定义;食品检验;特性;感官;感官分析(食品);试验;试验条件
【英文主题词】:Blankforms;Comparisonanalysis;Definitions;Differences;Foodproducts;Foodtesting;Forms;Forms(paper);Inspectors;Interpretations;Properties;Samplingmethods;Sensory;Sensoryanalysis;Sensoryanalysisapparatus;Sensoryanalysis(food);Specimenpreparation;Testequipment;Testreports;Testsamples;Testing;Testingconditions;Testingpersonnel
【摘要】:ThisInternationalStandarddescribesaprocedurefordeterminingwhetherthereexistsaperceptiblesensorydifferenceorasimilaritybetweensamplesoftwoproductsconcerningtheintensityofasensoryattribute.Thistestissometimesalsoreferredtoasadirectionaldifferencetestora2-AFCtest(AlternativeForcedChoice).Infact,thepairedcomparisontestisaforcedchoicetestbetweentwoalternatives.NOTEThepairedcomparisontestisthesimplestexistingclassificationtestsinceitconcernsonlytwosamples.Themethodisapplicablewhetheradifferenceexistsinasinglesensoryattributeorinseveral,whichmeansthatitenablesdeterminationofwhetherthereexistsaperceptibledifferenceconcerningagivenattribute,andthespecificationofthedirectionofdifference,butitdoesnotgiveanyindicationoftheextentofthatdifference.Theabsenceofdifferencefortheattributeunderstudydoesnotsignifythattheredoesnotexistanydifferencebetweenthetwoproducts.Thismethodisonlyapplicableiftheproductsarerelativelyhomogeneous.Themethodiseffectivea)fordetermining?whetheraperceptibledifferenceexists(paireddifferencetest),or?whethernoperceptibledifferenceexists(pairedsimilaritytest)when,forexample,modificationsaremadetoingredients,processing,packaging,handlingorstorageoperations,orb)forselecting,trainingandmonitoringassessors.Itisnecessarytoknow,priortocarryingoutthetest,whetherthetestisaone-sidedtest(thetestsupervisorknowsapriorithedirectionofthedifference,andthealternativehypothesiscorrespondstotheexistenceofadifferenceintheexpecteddirection)oratwo-sidedtest(thetestsupervisordoesnothaveanyaprioriknowledgeconcerningthedirectionofthedifference,andthealternativehypothesiscorrespondstotheexistenceofadifferenceinonedirectionortheother).
【中国标准分类号】:X04
【国际标准分类号】:67_240
【页数】:21P;A4
【正文语种】:英语
【英文标准名称】:EnergyStandardforBuildingsExceptLow-RiseResidentialBuildings
【原文标准名称】:除层数低而无电梯的住宅楼房外的建筑物的能量标准
【标准号】:ANSI/ASHRAE/IESNA90.1r-2001
【标准状态】:作废
【国别】:美国
【发布日期】:2001
【实施或试行日期】:
【发布单位】:美国国家标准学会(ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:P31
【国际标准分类号】:91_040_30;91_140_99;91_010_30
【页数】:
【正文语种】:英语