简介:监督分类法在遥感影像分类中应用广泛,结合已有地质资料和实测地质剖面信息,将研究区岩性分为苏维依组泥岩和粗砂岩,库姆格列木群泥岩、砾岩和含砾粗砂岩,巴什基奇克组粗砂岩和砾岩,巴西改组细砂岩等8个类型,运用ENVI提供的常用监督分类方法——最大似然法,对研究区的遥感影像进行岩性分类研究。并利用混淆矩阵分别对不同影像的分类结果进行精度评价,结果表明ZY-3影像的分类总体精度达到了78.65%,Kappa系数为0.7606,能够较好地进行岩性信息提取,具有较高的可靠性,可在地质调查工作中推广,能够有效地减少面积性地质测量工作,特别适用于岩石裸露程度较高的艰苦工作区。
简介:两倍缓冲是有效机制隐藏在在薄片上和离开薄片记忆之间的数据转移的潜伏。在dataflow建筑学,因为dataflow加速器的重复充满并且排干,然而,交换二在许多瓦减少的执行期间缓冲性能。在这个工作,我们为dataflow建筑学建议连续双的缓冲机制。没有停止通过在dataflow建筑学优化控制逻辑处理元素的执行,建议不停的机制把瓦分到处理元素数组。而且,我们建议一个工作流节目与连续双的缓冲机制合作。在控制逻辑上并且在工作流节目上的优化以后,充满并且排干数组需要越过属于一样的dataflow图的所有瓦的执行被做仅仅一次。试验性的结果证明没有优化,为dataflow建筑学的建议双缓冲机制在那上完成16.2%平均效率改进。
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简介:Comparedwithendpumpingfibercombiner,oneoftheadvantagesforsidepumpingcombineristheunlimitedpumpingpoints,whichmeansmulti-pointorcascadedsidepumpingcanberealized.However,thelossmechanismofthecascadedstructureisrarelydiscussed.Inthispaper,wepresentthenumericalandexperimentalinvestigationaboutthelossmechanismofatwo-stage-cascadedsidepumpingcombinerbasedontapered-fusedtechnique.Theinfluenceoflossmechanismonthecouplingefficiencyandthermalloadofthefibercoatingisanalyzedaccordingtosimulationsandexperimentswithdifferenttaperingratiosforthefirststage.Basedontheanalysis,acascadedcomponentwithtotalpumpcouplingefficiencyof96.4%handlingapumppowerof1088Wisachievedbyemploying1018nmfiberlaserasthepumpsource.Futureworktofurtherimprovetheperformanceofacascadedsidepumpingcombinerisdiscussedandprospected.
简介:Serviceprovidersoftenadoptthemechanismofcustomerclassificationduetotheheterogeneityofcustomerwaitingcost.However,theclassificationservicemaycauseunfairnessfeelingofregularcustomers,thenaffecttherevenueandsocialwelfare.Thispaperprovidesthefirstexactanalysisaboutthesituationthatserviceprovidersoffertwoclassesofnon-preemptivepriorityservicewhencustomerfairnessperceptionisexplicitlymodeled.Wemodelcustomerfairnessperceptionasanegativeutilityonregularcustomersthat’sproportionaltothewaitingtimedifferencebetweenthetwoqueues.ByanalyzingastylizedM/M/1queueinmonopolyservicesystem,wecanderiveimportantresultssomeofwhichreaffirmexistedresearchresults.First,fromtheperspectiveofrevenuemaximization,serviceprovidersshouldadoptthemechanismofcustomerclassificationandsetupthetwokindsofcustomerswheretheycanseeeachother.Next,consideringcustomerutilitymaximization,serviceprovidersshouldcancelthemechanismofcustomerclassification,andkeeponequeue(regularcustomers)only.Then,fromtheperspectiveofsocialwelfaremaximization,serviceprovidersshouldalsoadoptthemechanismofcustomerclassificationbutsetupthetwokindsofcustomerswheretheycannotfeeleachother.Finally,thispaperconcludestheoptimalpricingbasedoncustomerclassificationintheabovethreedifferentperspectives.Thisresearchshowsimportantreferencevalueandpracticalsignificanceforserviceproviderswhoadoptthemechanismofclassificationservice.
简介:摘要本文章简要讨论了在数学中有关圆的不遗漏、不重复的一些问题。通过典型例题与思维方法相结合,强调了师生不要忽视这种问题。