简介:随着食品安全问题日益受到人们重视,国家食品安全风险评估中心建立了食源性致病菌监测网,每年大量的数据需要进行统计分析,而操作简单、易用的分析软件将会给工作带来很大方便。该监测网从2010年开始使用食源性致病菌报告系统,将过去纯手工录入转变为网络计算机登记,最终数据以Excel格式导出。
简介:LedbyfourgenerationsofleadershipfromlateProf.JIANGSichang(academician,ChineseAcademyofEngineering),Prof.YANGWeiyan(HonoraryPresident,DivisionofOtolaryngologyHeadandNeckSurgery,ChineseMedicalAssociation),Prof.HANDongyi(PresidentElected,DivisionofOtolaryngologyHeadandNeckSurgery,ChineseMedicalAssociation)tonowProf.YANGShiming(President,DivisionofOtolaryngologists,
简介:Lightweightdesignisoneofthedevelopmenttrendsoftheautomobileindustry.AneffectivewaytoachievelightweightautobodiesistouseAHSS(advancedhighstrengthsteel)forthesafetycomponentsofautomobiles.ThisstudyhastakendoorsillreinforcementsmadeofmartensiteAHSSastheobject,andperformedresearchontheAHSSrollformingtechnologiesandprototypedevelopmentoftypicalasymmetricopencomponents.Bymeansoffiniteelementanalysis(FEA)andsimulation,studieshavebeencarriedoutonthespringbackandedgewavedefectsduringAHSSrollforming,andanoptimizedprocessdesignhasbeenachieved.Thegenerationmechanismsofverticalbows,horizontalcambers,twists,pre-punchedholedistortionandcutendflarehavebeenanalyzed,andsolutionstothesedefectshavebeengiven.Inaddition,tesingoftherollformingprocessforAHSShasbeenconductedandtypicalsampleswithrequireddimensionalaccuracyhavebeenmanufactured.Thisstudyhasprovidedtechnicalsupportforthelarge-scaleapplicationofAHSS.
简介:Large-scaleMIMO(multiple-inputmultiple-output)systemswithnumerouslow-powerantennascanprovidebetterperformanceintermsofspectrumefficiency,powersavingandlinkreliabilitythanconventionalMIMO.Forlarge-scaleMIMO,thereareseveraltechnicalissuesthatneedtobepracticallyaddressed(e.g.,pilotpatterndesignandlow-powertransmissiondesign)andtheoreticallyaddressed(e.g.,capacitybound,channelestimation,andpowerallocationstrategies).Inthispaper,weanalyzethesumrateupperboundoflarge-scaleMIMO,investigateitskeytechnologiesincludingchannelestimation,downlinkprecoding,anduplinkdetection.Wealsopresentsomeperspectivesconcerningnewchannelmodelingapproaches,advanceduserschedulingalgorithms,etc.
简介:目的探讨卫生统计数据质量的影响因素,有针对性地采取措施,提高数据质量。方法采用定性与定量的研究方法收集卫生统计数据质量的影响因素,探讨卫生统计数据失真的原因。结果调查全国476个医疗卫生机构卫生统计负责人476人次,有20个因素50%以上的调查对象认为对数据质量有影响,其中属于制度、体制及机制因素的12个,基础条件因素3个,信息化建设3个,人的因素2个。影响因素比例较高的前10位依次为:统计培训不够(74.62%),报表规定报送的时间是否合理(63.83%),报表顶层设计部门未协调沟通、统计口径不统一(61.70%),人员为兼职或外聘(61.18%),调查制度制定的科学性(61.11%),代报制度是否合理(60.56%),调查内容是否易获得(59.62%),管理体制混乱、交叉重复(59.15%),机构内部各部门缺乏沟通(59.02%),缺乏相应的工具书(58.65%)。结论制度、体制及机制因素是影响数据质量的重要因素,提高数据质量要从管理制度、顶层设计抓起,可起到事半功倍的效果。
简介:大数据(bigdata)泛指伴随社会化数据出现的大量在线文本、图片、流媒体数据。因其数据量巨大又可以从中挖掘出有价值的信息,目前被世界经济论坛的相关报告认定为其价值堪比石油的新财富。随着互联网和移动互联网的发展,无处不在的信息感知和采集终端,将行政管理、生产经营、商务活动等众多领域源源不断产生的海量即时电子化数据,通过“云计算”技术构建了一个与物质世界相平行的数字世界,所以很多专家认为人类已经跨入了大数据时代。作为数据生产的权威机关,这样一个时代的到来给统计调查工作带来了什么样的挑战与启示?统计调查部门和统计调查工作者应该怎样应对才能满足时代提出的需求?对此。笔者结合多年基层工作经历进行了初步探讨。
简介:Opticalmotioncaptureisanincreasinglypopularanimationtechnique.Inthelastfewyears,plentyofmethodshavebeenproposedforkey-frameextractionofmotioncapturedata,anditisacommonmethodtoextractkey-frameusingquaternion.Here,onemaindifficultyisduetothefactthatpreviousalgorithmsoftenneedtomanuallysetvariousparameters.Inaddition,itisproblematictopredefinetheappropriatethresholdwithoutknowingthedatacontent.Inthispaper,wepresentanoveladaptivethreshold-basedextractionmethod.Key-framecanbefoundaccordingtoquaterniondistance.Weproposeasimpleandefficientalgorithmtoextractkey-framefromamotionsequencebasedonadaptivethreshold.Itisconvenientwithnoneedtopredefineparameterstomeetcertaincompressionratio.Experimentalresultsofmanymotioncaptureswithdifferenttraitsdemonstrategoodperformanceoftheproposedalgorithm.Ourexperimentsshowthatonecantypicallycutdowntheprocessofextractionfromseveralminutestoacoupleofseconds.