简介：ThisstudyconcernssecurityissuesoftheemergingWirelessBodySensorNetwork(WBSN)formedbybiomedicalsensorswornonorimplantedinthehumanbodyformobilehealthcareappli-cations.Anovelauthenticatedsymmetric-keyestablishmentschemeisproposedforWBSN,whichfullyexploitsthephysiologicalfeaturesobtainedbynetworkentitiesviathebodychannelavailableinWBSNbutnototherwirelessnetworks.Theself-definedIntrinsicSharedSecret(ISS)isusedtoreplacethepre-deploymentofsecretsamongnetworkentities,whichthuseliminatescentralizedservicesorau-thoritiesessentialinexistingprotocols,andresolvesthekeytransportprobleminthepuresymmet-ric-keycryptosystemforWBSNaswell.Thesecuritypropertiesoftheproposedschemearedemon-stratedintermsofitsattackcomplexityandthetypesofattacksitcanresist.Besides,theschemecanbeimplementedunderalight-weightwayinWBSNsystems.DuetotheimportanceoftheISSconcept,theanalysisonusingfalseacceptance/falserejectionmethodtoevaluatetheperformanceofISSforitsusageintheschemeisalsodemonstrated.

简介：Recently,ithasbeenseenthattheensembleclassifierisaneffectivewaytoenhancethepredictionperformance.However,itusuallysuffersfromtheproblemofhowtoconstructanappropriateclassifierbasedonasetofcomplexdata,forexample,thedatawithmanydimensionsorhierarchicalattributes.Thisstudyproposesamethodtoconstructeanensembleclassifierbasedonthekeyattributes.Inadditiontoitshigh-performanceonprecisionsharedbycommonensembleclassifiers,thecalculationresultsarehighlyintelligibleandthuseasyforunderstanding.Furthermore,theexperimentalresultsbasedontherealdatacollectedfromChinaMobileshowthatthekey-attributes-basedensembleclassifierhasthegoodperformanceonbothoftheclassifierconstructionandthecustomerchurnprediction.

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简介：Theresultsofastudyonthekeytechnologyofusingshellsand,akindofseasand,asbackfillforseareclamationaredescribedbriefly.Laboratorytestsshowthatthephysicalandmechanicalpropertiesofshellsandareasgoodasnormalquartzsand.Basedonthechemicaltestanddurabilitytestofshellsanditcouldbeconcludedthattheinfluenceofcorrosionofshellsandbyacidrainandseawatermightbeignoredintheevaluationofthesafetyanddurabilityoftheengineeringproject.Theresultsoffieldimprovementtestsshowthatthebearingcapacityofshellsandbackfillfoundationismorethan200kPaaftervibroflotationimprovementordynamiccompactionimprovement.Theshellsandisagoodbackfillmaterialforseareclamation.

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简介：<正>Withitsrise,Chinaattractedmoreandmoreattentionfromallovertheworld.PeoplearewillingtoknowhowChinaachievedsuchgreatdevelopmentunprecedentedinthehistoryofhumanbeingssincethereformandopeningupsome30yearsagoandwhattheriseofChinameanstotherestoftheworld.

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简介：Histogramofcollineargradient-enhancedcoding(HCGEC),arobustkeypointdescriptorformulti-spectralimagematching,isproposed.TheHCGECmainlyencodesroughstructureswithinanimageandsuppressesdetailedtexturalinformation,whichisdesirableinmulti-spectralimagematching.Experimentsontwomulti-spectraldatasetsdemonstratethattheproposeddescriptorcanyieldsignificantlybetterresultsthansomestate-ofthe-artdescriptors.

简介：摘要：本文介绍赣深铁路小金口特大桥96米系杆拱梁部支架施工工艺技术。该系杆拱跨越S21广惠高速，其起讫里程范围为: DK348+434.955～DK348＋534.305，全长100m，本文结合具体工程案例，对跨高速系杆拱梁特点，并制定工艺技术保障措施，可为同类工程提供借鉴。

简介：摘要广清城际铁路一处1-80m简支组合拱桥的系梁现浇施工。属于高墩、大跨度、大自重的系梁支架现浇施工。支架现浇体系采取了混合支架法（梁柱式支架+碗扣满堂式支架的组合形式）。本文对该现浇系梁的混合支架的设计体系及检算过程进行介绍与研究。该系梁采用混合支架法施工具有其适应性及实用效果，且具有安全、经济、高效及施工质量易于保证等优点，可以在我国类似组合拱桥系梁现浇的工程建设中进行借鉴应用。文本通过这种混合式支架体系的介绍，可对以后类似工程中采用类似支架体系具有借鉴意义。

简介：针对宽幅大跨钢桁梁桥面系设计中主桁与桥面系共同作用过大的问题，介绍解决其共同作用的常规代表性方法，结合宽幅大跨钢桁梁工程实例，提出了改善结构受力状态的构造及施工措施，构造及施工措施对类似工程有直接参考价值。