简介:ThebackdoororinformationleakofWebserverscanbedetectedbyusingWebMiningtechniquesonsomeabnormalWeblogandWebapplicationlogdata.ThesecurityofWebserverscanbeenhancedandthedamageofillegalaccesscanbeavoided.Firstly,thesystemfordiscoveringthepatternsofinformationleakagesinCGIscriptsfromWeblogdatawasproposed.Secondly,thosepatternsforsystemadministratorstomodifytheircodesandenhancetheirWebsitesecuritywereprovided.Thefollowingaspectsweredescribed:oneistocombinewebapplicationlogwithweblogtoextractmoreinformation,sowebdataminingcouldbeusedtomineweblogfordiscoveringtheinformationthatfirewallandInformationDetectionSystemcannotfind.AnotherapproachistoproposeanoperationmoduleofwebsitetoenhanceWebsitesecurity.Inclusterserversession,Density-BasedClusteringtechniqueisusedtoreduceresourcecostandobtainbetterefficiency.
简介:Theobjectiveofthisworkistoanalyzethefatiguereliabilityofcomplexweldedstructurescomposedofmultipleweb-framejoints,accountingforcorrelationeffects.Athree-dimensionalfiniteelementmodelusingthe20-nodesolidelementsisgenerated.Alinearelasticfiniteelementanalysiswasperformed,hotspotstressesinaweb-framejointwereanalyzedandfatiguedamagewasquantifiedemployingtheS-Napproach.Thestatisticaldescriptorsofthefatiguelifeofanon-correlatedweb-framejointcontainingseveralcriticalhotspotswereestimated.Thefatiguereliabilityofaweb-framejointwasmodeledasaseriessystemofcorrelatedcomponentsusingtheDitlevsenbounds.Thefatiguereliabilityoftheentireweldedstructurewithmultipleweb-framejoints,modeledasaparallelsystemofnon-correlatedweb-framejointswasalsocalculated.
简介:核心战略能力借助现代物流的网络化体系进行供应链的一体化管理,在全球范围内整合企业内外的各种资源,以较低的成本和快速的反应提供个性化的产品和服务,增加顾客的满意度,已成为企业赢得市场和效益的核心能力的重要体现.正是基于此种认识,美国的联邦包裹(UPS)公司、全球最大的零售商沃尔玛公司、我国的中远集团、海尔集团、青啤集团等企业,都将物流能力定位在提升核心竞争力的战略高度.可见,现代物流不再是从属并服务于生产的辅助流程,而是订单信息流驱动的,集采购、运输、仓储、转运、配送为一体的,连接供应商、生产者和消费者的核心流程.提供高效、敏捷的物流服务,即作为一种核心战略能力,是衡量一个企业市场竞争力的重要指标,也是企业在激烈的市场竞争中谋求生存发展的基本条件.