YD/T 2329.3-2011 分组电信数据网(PTDN)体系架构 第3部分:网络层
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基本信息
标准名称: | 分组电信数据网(PTDN)体系架构 第3部分:网络层 |
发布部门: | 中华人民共和国工业和信息化部 |
发布日期: | 2011-12-20 |
实施日期: | 2012-02-01 |
首发日期: | |
作废日期: | |
出版社: | 人民邮电出版社 |
出版日期: | 2012-02-01 |
适用范围
本部分规定了PTDN网络的网络层分组封装技术和分组包头的基本结构,定义了分组基本报头的分配和功能,不包括网络层的控制管理规程。
本部分适用于PTDN网络和相关的网络设备。
前言
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引用标准
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所属分类: 仪器 仪表 其他仪器仪表 气象仪器 数学 自然科学 地质学 气象学 水文学
【英文标准名称】:StandardPracticeforEstimatingThurstonianDiscriminalDistances
【原文标准名称】:评定瑟斯顿识别距离的标准实施规程
【标准号】:ASTME2262-2003(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2003
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E18.03
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:Forced-choicedatasets;Thurstoniandiscriminaldistances;Unidimensionalequal-variancemodel
【摘要】:Undertheassumptionsofthemodel,theThurstonianmodelapproachtomeasuringtheperceiveddifferencebetweentwosamples(whetheroverallorforaspecificattribute)isindependentofthesensorymethodusedtocollectthedata.Convertingresultsobtainedfromdifferenttestmethodstod''valuespermitstheassessmentofrelativedifferencesamongsampleswithoutrequiringthatthesamplesbecomparedtoeachotherdirectlyorthatthesametestmethodsbeusedforallpairsofsamples.Thurstonianscalinghasbeenappliedto:Creatingahistoricaldatabasetotrackdifferencesbetweenproductionandreferencesamplesoverperiodsinwhichdifferenttestmethodswereusedtomeasurethedifference,Comparingtherelativesensitivitiesofdifferentusergroupsandconsumersegments,Comparingtrainedpanelsthatusedifferentmeasuringtechniques,Comparingtherelativesensitivitiesofconsumersversustrainedpanels,Comparingdifferentmethodsofconsumertesting(forexample,CLTversusHUT,preferenceversushedonicscales,etc.),andComparingdifferentdiscriminationtestmethods.1.1ThispracticedescribesprocedurestoestimateThurstoniandiscriminaldistances(thatis,d''values)fromdataobtainedontwosamples.Proceduresarepresentedforfourforced-choicemethods(thatis,thetriangle,theduo-trio,the3-alternative-forced-choice(or3-AFC)andthe2-AFC(alsocalledthedirectionaldifferencetest)),theA/Not-Amethod,theSame-Differentmethodandfordataobtainedfromorderedcategoryscales.Proceduresforestimatingthevarianceofd''arealsopresented.Thus,confidenceintervalsandstatisticaltestscanbecalculatedford''.1.2Theproceduresinthisdocumentpertainonlytotheunidimensional,equal-variancemodel.Other,morecomplicatedThurstonianmodels,involvingmultipledimensionsandunequalvariancesexistbutarenotaddressedinthisstandard.Theprocedureforforced-choicemethodsislimitedtodichotomousresponses.TheprocedurefortheA/Not-Amethodassumesequalsamplesizesforthetwosamples.TheprocedurefortheSame-Differentmethodassumesequalsamplesizesforthematchedandunmatchedpairsofsamples.Forallmethods,onlyunreplicatedtestsareconsidered.(Testsinwhicheachassessorperformsmultiple(thatis,replicated)evaluationsrequiredifferentanalyses.)1.3Thurstonianscalingisamethodformeasuringtheperceptualdifferencebetweentwosamplesbasedonaprobabilisticmodelforcategoricalchoicedecisionmaking.Themagnitudeoftheperceiveddifference,x03B4;,canbeestimatedfromtheassessors''categoricalchoicesusingthemethodsdescribedinthispractice(SeeAppendixX3foramoredetaileddescriptionofThurstonianscaling).1.4Intheory,theThurstonianx03B4;doesnotdependonthemethodusedtomeasurethedifferencebetweentwosamples.Assuch,x03B4;providesacommonscaleofmeasureforcomparingsamplesmeasuredunderavarietyoftestconditions.Forexample,Thurstonianscalingcanbeusedtocompareproductsmeasuredunderdifferenttestconditions,tocomparepanels(trained,consumerorboth)thathaveevaluatedthesamesamples(usingthesameordifferenttestmethods)andtocomparetestmethodsontheirabilitytodiscriminatesamplesthatexhibitafixedsensorydifference.1.5Thisstandardmayinvolvehazardousmaterials,operationsandequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestabl......
【中国标准分类号】:A52
【国际标准分类号】:67_240
【页数】:47P.;A4
【正文语种】:英语
【英文标准名称】:Genericspecificationofinformationonproducts-Part1:Principlesandmethods
【原文标准名称】:产品信息通用规范.第1部分:原理和方法
【标准号】:IEC/PAS62569-1-2009
【标准状态】:现行
【国别】:国际
【发布日期】:2009-06
【实施或试行日期】:
【发布单位】:国际电工委员会(IX-IEC)
【起草单位】:IEC/TC3
【标准类型】:()
【标准水平】:()
【中文主题词】:数据结构;定义;名称与符号;文件;文献;电气工程;总规范;图形符号;识别;工业产品;信息;信息表示法;对象;产品数据;产品说明;产品;产品文件;参考;结构;结构化
【英文主题词】:Datastructures;Definitions;Designations;Documentations;Documents;Electricalengineering;Genericspecification;Graphicsymbols;Identification;Industrialproducts;Information;Informationrepresentation;Object;Productdata;Productdescriptions;Products;Productsdocumentation;References;Structure;Structuring
【摘要】:
【中国标准分类号】:K04
【国际标准分类号】:01_110;29_020;35_240_50
【页数】:26P;A4
【正文语种】:英语