YD/T 1389-2005 基于软交换的媒体服务器测试方法
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基本信息
| 标准名称： | 基于软交换的媒体服务器测试方法 |
| 英文名称： | Texting methods of media server based on softswitch |
| 中标分类： |
通信、广播 >>
通信设备 >>
通信设备综合 |
| ICS分类： |
电信、音频和视频技术 >>
电信终端设备
|
| 发布日期： | 2005-09-01 |
| 实施日期： | 2005-12-01 |
| 首发日期： | |
| 作废日期： | |
| 起草单位： | 信息产业部电信研究院、华为技术有限公司、中兴通讯股份有限公司 |
| 出版日期： | |
| 页数： | 68页 |
适用范围
本标准规定了基于软交换的媒体服务器的功能测试、性能测试、接口测试、协议测试、可靠性测试、电气安全测试和环境测试等。本标准适用于基于软交换的媒体服务器。
前言
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目录
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引用标准
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所属分类： 通信 广播 通信设备 通信设备综合 电信 音频和视频技术 电信终端设备
Product Code:SAE MA3341
Title:Bolt, Machine-Spline Extended Washer, Full Shank, Long Thread, AMS 5731, Metric
Issuing Committee:E-25 General Standards For Aerospace And Propulsion Systems
Scope:No scope available【英文标准名称】:StandardPracticeforUseofControlChartsinStatisticalProcessControl
【原文标准名称】:统计过程控制中控制图的使用标准实施规程
【标准号】:ASTME2587-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:E11.30
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:控制图;过程控制;质量;质量管理;统计方法分析;统计质量控制;统计学;使用
【英文主题词】:commoncause;controlchart;controllimits;rationalsubgroup;specialcause;stateofstatisticalcontrol;statisticalprocesscontrol;Controlcharts;Statisticalprocesscontrol(SPC)
【摘要】:Thispracticedescribestheuseofcontrolchartsasatoolforuseinstatisticalprocesscontrol(SPC).ControlchartsweredevelopedbyShewhart(1)inthe1920sandarestillinwideusetoday.SPCisabranchofstatisticalqualitycontrol(2,3),whichalsoencompassesprocesscapabilityanalysisandacceptancesamplinginspection.Processcapabilityanalysis,asdescribedinPracticeE2281,requirestheuseofSPCinsomeofitsprocedures.Acceptancesamplinginspection,describedinPracticesE1994andE2234,requirestheuseofSPCsoastominimizerejection.PrinciplesofSPC8212;Aprocessmaybedefinedasasetofinterrelatedactivitiesthatconvertinputsintooutputs.SPCusesvariousstatisticalmethodologiestoimprovethequalityofaprocessbyreducingthevariabilityofoneormoreofitsoutputs,forexample,aqualitycharacteristicofaproductorservice.Acertainamountofvariabilitywillexistinallprocessoutputsregardlessofhowwelltheprocessisdesignedormaintained.Aprocessoperatingwithonlythisinherentvariabilityissaidtobeinastateofstatisticalcontrol,withitsoutputvariabilitysubjectonlytochance,orcommon,causes.Processupsets,saidtobeduetoassignable,orspecialcauses,aremanifestedbychangesintheoutputlevel,suchasaspike,shift,trend,orbychangesinthevariabilityofanoutput.ThecontrolchartisthebasicanalyticaltoolinSPCandisusedtodetecttheoccurrenceofspecialcausesoperatingontheprocess.Whenthecontrolchartsignalsthepresenceofaspecialcause,otherSPCtools,suchasflowcharts,brainstorming,cause-and-effectdiagrams,orParetoanalysis,describedinvariousreferences(3-7),areusedtoidentifythespecialcause.Specialcauses,whenidentified,areeithereliminatedorcontrolled.Whenspecialcausevariationiseliminated,processvariabilityisreducedtoitsinherentvariability,andcontrolchartsthenfunctionasaprocessmonitor.Furtherreductioninvariationwouldrequiremodificationoftheprocessitself.Theuseofcontrolchartstoadjustoneormoreprocessinputsisnotrecommended,althoughacontrolchartmaysignaltheneedtodoso.ProcessadjustmentschemesareoutsidethescopeofthispracticeandarediscussedbyBoxandLuce?/span>o(8).1.1Thispracticeprovidesguidancefortheuseofcontrolchartsinstatisticalprocesscontrolprograms,whichimproveprocessqualitythroughreducingvariationandcontrollingtheprocesstoaparticulartargetlevelorhistoricalaverage.1.2Controlchartsareusedtomonitorproductorprocesscharacteristicstodeterminewhetherornotaprocessisinastateofstatisticalcontrol.Whenthisstateisattained,thetruemeanandthetruestandarddeviationofthatcharacteristicareconstant.1.3Thispracticeappliestovariablesdata(characteristicsmeasuredonacontinuousnumericalscale)andtoattributesdata(characteristicsmeasuredaspercentages,fractions,orcountsofoccurrencesinadefinedintervaloftimeorspace).1.4Thesystemofunitsforthispracticeisnotspecified.Dimensionalquantitiesinthepracticearepresentedonlyasillustrationsofcalculationmethods.Theexamplesarenotbindingonproductsortestmethodstreated.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddetermine......
【中国标准分类号】:A41
【国际标准分类号】:03_120_30
【页数】:13P.;A4
【正文语种】:
