简介:Inordertoovercomethepoorlocalsearchabilityofgeneticalgorithm,resultinginthebasicgeneticalgorithmistime-consuming,andlowsearchabilityinthelateevolutionary,weusethegraycodinginsteadofbinarycodingatthebeginningofthecoding;weusemulti-pointcrossovertoreplacetheoriginalsingle-pointcrossoveroperation.Finally,theexperimentshowsthattheimprovedgeneticalgorithmnotonlyhasastrongsearchcapability,butalsothestabilityhasbeeneffectivelyimproved.
简介:Aimingattheproblemssuchasmorerepeatedlydesignandlongerdesigncycle,inthispaper,thesimilaritytheorywasintroducedtothedesignprocessofthekeystructuresofflotationmachine.TheimpellerandU-shapedtankofflotationmachinesystemwereanalyzedassimilarityunit.Meanwhile,thelevelofsimilarityoftheunitsandthesimilarityofthesystemwerecalculated.BasedontheanalysisoftheimpellerandthesizeofU-shapedtank,thesimilaritycriteriawerederived.Thederivedconclusionsare:(1)Therelationshipbetweenthediameteroftheimpellerandthevolumeofthetankwaspowerfunctionandcalculatedasthesimilaritycriteriaoftheimpeller;(2)TherelationshipbetweentheratiobetweentheU-shapedtank’scross-sectionalareaandimpeller’sdiameterandthevolumeofthetankwaspowerfunctionandcalculatedasthesimilaritycriterionsoftheU-shapedtank.Usingthesimilaritycriterioncombinedwithcomputertechnologyanddatabasetechnologytorealizepartandsystemserializationdesign.Theresultsshowthattheresearchcanavoidrepeatedlydesign,shortendesigncycle,andraisethedesignefficiency.
简介:Opticalmotioncaptureisanincreasinglypopularanimationtechnique.Inthelastfewyears,plentyofmethodshavebeenproposedforkey-frameextractionofmotioncapturedata,anditisacommonmethodtoextractkey-frameusingquaternion.Here,onemaindifficultyisduetothefactthatpreviousalgorithmsoftenneedtomanuallysetvariousparameters.Inaddition,itisproblematictopredefinetheappropriatethresholdwithoutknowingthedatacontent.Inthispaper,wepresentanoveladaptivethreshold-basedextractionmethod.Key-framecanbefoundaccordingtoquaterniondistance.Weproposeasimpleandefficientalgorithmtoextractkey-framefromamotionsequencebasedonadaptivethreshold.Itisconvenientwithnoneedtopredefineparameterstomeetcertaincompressionratio.Experimentalresultsofmanymotioncaptureswithdifferenttraitsdemonstrategoodperformanceoftheproposedalgorithm.Ourexperimentsshowthatonecantypicallycutdowntheprocessofextractionfromseveralminutestoacoupleofseconds.
简介:发票是从事生产、经营的企事业单位和个人,向付款方开具的收款凭证。一旦使用了假发票,会影响国家税收或个人的合法权益。尽管公安机关连年打击发票违法犯罪,但还是有种“野火烧不尽”的感觉。就是受到巨大的经济利益诱惑,很多发票造假者铤而走险。其实,有专家认为,防伪成本过低是假发票频现的主要原因。造假者不需要太高的投资就可以得到利益丰厚的假发票,这就是不能根除发票造假的原因。当然,假发票市场旺盛也是一个重要原因。公安部组织了一系列打击发票违法犯罪的专项行动。公安机关坚持“标本兼治、重在治本”,不断健全完善打击整治假发票长效机制,努力从源头上遏制假发票违法犯罪。2013年十大发票犯罪典型案例反映出严厉地打击取得的丰硕成果。小小的发票包含着多种防伪技术,从纸张、油墨、印章到印刷、制造工艺都使造假的难度提高,造假成本大增。本刊简要地介绍了发票所使用的防伪技术,期望读者了解发票的防伪技术,学会辨别真假发票,杜绝使用假发票。此外,由于我国发票种类繁多,我们列举了江苏的发票分类和辨别方法,让读者做系统的了解。
简介:活动教育(ActivityEducation)是一种具有渊远思想基础和广泛实践影响的理论主张。但“活动教育”作为一种课程的形式在学校确立,还是近代的产物。美国教育家杜威“活动教育”的理论基础是实用主义教育哲学,影响深远而广泛。在世界范围内,随着新的课程理论的不断兴起与出现,比如要素主义、结构主义、人本主义等,使活动教育理论在批判与继承中时起时落,不断得到发展,最有贡献的是皮亚杰的发生认识论,重新确立了活动教育的地位。而马克思主义关于活动的学说,全面地阐述了人与活动的关系,揭示了人为什么要活动的深层原因,总结了人的活动特点,
简介:研究性学习进入“瓶颈”。制度和课时保障,组织周密,安排科学,是“常态化”研究性学习的,必备条件和充分条件。