简介：

简介：Wepresentthesolidmodeleditdistance(SMED),apowerfulandflexibleparadigmforexploitingshapesimilaritiesamongstCADmodels.ItisdesignedtomeasurethemagnitudeofdistortionsbetweentwoCADmodelsinboundaryrepresentation(B-rep).Wegivetheformaldefinitionbyanalogywithgrapheditdistance,oneofthemostpopulargraphmatchingmethods.Toavoidtheexpensivecomputationalcostpotentiallycausedbyexactcomputation,anapproximateprocedurebasedonthealignmentoflocalstructuresetsisprovidedinaddition.Inordertoverifytheflexibility,wemakeintensiveinvestigationsonthreetypicalapplicationsinmanufacturingindustry,anddescribehowourmethodcanbeadaptedtomeetthevariousrequirements.Furthermore,amultilevelmethodisproposedtomakefurtherimprovementsofthepresentedalgorithmonbotheffectivenessandefficiency,inwhichthemodelsarehierarchicallysegmentedintotheconfigurationsoffeatures.ExperimentresultsshowthatSMEDservesasareasonablemeasurementofshapesimilarityforCADmodels,andtheproposedapproachprovidesremarkableperformanceonareal-worldCADmodeldatabase.

简介：天正市政软件根据线形设计工作过程,天正市政设计软件,设计高程表>

简介：地质勘探工程技术人员在绘图时，常使用重复的手工作业，不但乏味而且工作效率低。绘图精度不高而且容易出现错误，利用VB对CAD的开发技术，可以为广大工程绘图人员提供更加简洁、快速、高效的制图技术和方法。

简介：分两类不同的需求讨论了需求分析中遇到的问题及解决方法,我认为在需求分析中工具的作用不外乎两个,在需求分析中工具方法都只是辅助项目成功的因素