简介:Inordertoovercomemanyproblemsandshortcomingsofourthree-dimensionaldesigneducationinmechanicaldrawing,makethestudentsmasterthemoderndesignmethodandtechnologyeasily,modernmodelingmethodandshapingmethodareintroduced,andtheshapingdesigningmethodsofassembled-bodyareanalyzedincludingbasicrequirementsforshapingdesign,commonprinciplesofshapingandshapingdesignmethod.Itwillbehelpfultoimprovethespatialimaginationandmodellingabilityofstudent.
简介:ThispaperpresentsanewandsimpleschemetodescribetheconvexhullinR^d,whichonlyusesthreekindsofthefacesoftheconvexhull.i.e.,thed-1-faces,d-2-facesand0-faces.Thus,wedevelopandefficientnewalgorithmforconstructingtheconvexhullofafinitesetofpointsincrementally.Thisalgorithmemploysmuchlessstorageandtimethanthatofthepreviously-existingapproaches.Theanalysisoftherunniingtimeaswellasthestorageforthenewalgorithmisalsotheoreticallymade.Thealgorithmisoptimalintheworstcaseforevend.
简介:Thispaperisconcernedwiththenumericalsimulationoftheinjectionmoldfillingprocess.AmathematicalmodelbasedongeneralizedHele-Shawflowforaninelasticnon-Newtonianfluidundernonisothermalconditionsisused.Ahybridnumericalschemeisemployed.Thenumericalsimulatingre-sults,pressureandtemperatureprofile,locationofthemeltfronts,areinagoodagreementwiththeex-perimentalones.
简介:在这篇论文,二维的弄歪的分离Fourier变换(2-DWDFT)基于1-DWDFT的概念被开发。一个准确计算算法与特殊结构基于矩阵factorizing为2-DWDFT被开发。一个快算法然后被建议极大地减少反的2-DWDFT的计算复杂性。最后,数字例子被给显示出建议途径的效率。
简介:我们在场统一的一个多水平分区为能被设计或在一种含蓄的形式代表的表面重建的代数学的集合表面(MPU-APSS)。代数学的点集合表面(APSS)用本地移动从一套未组织起来的点定义光滑的表面最少平方(MLS)代数学的范围适合。由于本地性质,然而,APSS不为几何学编辑并且当模特儿工作很好。相反,我们的方法基于统一途径的分区为散布的点集合造一个含蓄的近似函数。由使用octree分策略,我们适应地首先为点集合构造本地代数学的范围,然后使用weighting功能一起混合这些本地形状功能。最后,我们从表面计算签署的距离功能的控制错误的近似。另外,我们在场为点使我们的表示合适的一个有效设计操作员设定过滤并且动态点采样。我们为表面重建并且几何学当模特儿例如表面结束表明我们的统一途径的有效性。
简介:在在标记的来源域利用知识在目标域预言未标记的数据转移学习目的,在分布在域是不同的的地方。在为转移学习的各种各样的方法之中,一个种算法从不同领域集中于在桥特征和所有另外的特定的特征之间的通讯,并且以后进行经由单个看法的通讯学习的转移。然而,单个看法的通讯可以由于不正确的关联发现的问题阻止这些算法进一步的改进。处理这个问题,我们为在一个多看法通讯观点学习的转移建议一个新方法,它被称为多看法主要部件分析(MVPCA)途径。MVPCA分别地从不同领域发现在越过所有领域代表性的桥特征和特定的特征之间的通讯,并且进行以一个多看法方法由维数减小学习的转移,它能更好描绘知识转移。实验证明MVPCA能显著地减少一个基线非转移方法的生气领域预言错误。与合并到学习方法的单个看法的转移的多看法通讯信息,MVPCA能进一步改进一个最先进的单个看法的方法的表演。
简介:Pathplanningin3Dgeometryspaceisusedtofindanoptimalpathintherestrictedenvironment,accordingtoacertainevaluationcriteria.Tosolvetheproblemoflongsearchingtimeandslowsolvingspeedin3Dpathplanning,amodifiedantcolonyoptimizationisproposedinthispaper.Firstly,thegridmethodforenvironmentmodelingisadopted.Heuristicinformationisconnectedwiththeplanningspace.Asemi-iterativeglobalpheromoneupdatemechanismisproposed.Secondly,theoptimalantsmutatethepathstoimprovethediversityofthealgorithmafteradefinediterativenumber.Thirdly,co-evolutionaryalgorithmisused.Finally,thesimulationresultshowstheeffectivenessoftheproposedalgorithminsolvingtheproblemof3Dpipepathplanning.
简介:Accordingtothestudyonseat-backcurvesaboutdifferentpeople,themethodthatusingtwoarc-shapedroofstogivebacksupportingforceofthehumanbodyisproposed.Throughacleverdesignapplicationofpiezoelectricsensor,microcontroller,motors,andarc-shapedroofsformaclosedloopcontrolsystem.Throughthedesignofhorizontalandverticaladjustmentmechanism,aflexibleandadaptivemulti-dimensionalbackcanreducetheharmtohumanspinewhichcausedbypoorpostureandsedentarylifestyle.ModelbuildingandstressanalysisaredonebyInventorsoftwaretoverifythemechanismofstrength.
简介:Knowledgeabouthumanbeingsisanintegralpartofanyintelligentagentofconsiderablesignificance.Delimiting,modelingandacquiringsuchknowledgearethecentraltopicsofthispaper.Becauseofthetremendouscomplexityinknowledgeofhumanbeings,weintroduceatop-levelontologyofhumanbeingsfromtheperspectivesofpsychology,sociology,physiologyandpathology.Thisontologyisnotonlyanexplicitconceptualizationofhumanbeings,butalsoanefficientwayofacquiringandorganizingrelevantknowledge.