简介:摘要:数十年以来,如何有效地识别财务风险已经成为众多研究学者的论题,本文通过主成分分析方法从上市公司公开数据中提取有效风险因子,并建立logistic回归模型,抓取两年数据进行验证,以便更好地识别上市公司财务风险。
简介:Prostatecancergene3(PCA3,alsoknownasDD3)isanewbiomarkerthatcouldimprovetheaccuracyofprostatecancerdiagnosis.Itisagreatbiomarkerwithfairlyhighspecificityandsensitivity.Theincidenceofprostatecancerisrisingsteadilyinmostcountries.Thecommonlyusedprostate-specificantigen(PSA)testoncegavepeoplehopeforearlydiagnosisofprostatecancer.However,thelowspecificityofthePSAtesthasresultedinalargenumberofunnecessarybiopsiesandovertreatment.Duringthepastdecade,manynewprostatecancerbiomarkershavebeenfound.Amongthese,PCA3isthemostpromising.Duetoitsgreatperformanceindistinguishingprostatecancerfromotherprostateconditions,PCA3couldlikelybeappliedforearlydiagnosisofprostatecancer,patientfollow-up,prognosisprediction,andtargetedtherapy.Afteryearsofresearch,wehaveobtainedsomeknowledgeaboutthesequenceofPCA3gene.WehavealsodeterminedtherelationshipbetweenPCA3andtheproliferationofprostatecancercellsandlearnedsomeinformationabouthowPCA3affectstumor-relatedgenesandproteins.APCA3scorehasbeencreated,andithasbeenusedinavarietyofstudies.SomeresearchershaveevenappliedPCA3totargetedtherapyandobtainedagoodeffectinvitro.Thisreviewdescribesthecurrentstateofresearch,andexploresthefutureprospectsforPCA3.更多还原
简介:我们构造稀少的表示和subspace表示的一个合作模型。首先,我们代表追踪在原则部件分析(PCA)指向subspace,然后我们采用L1规则化限制剩余学期的稀少,限制表示系数的稀少的一个L2规则化学期,并且限制在重建和目标之间的距离的一个L2标准。然后,我们在粒子过滤器框架实现算法。而且,一个反复的方法被介绍得到剩余和系数的全球最小。最后,一个其他的模板更改计划被采用避免被不精密的更改引起的追踪的飘移。在实验,我们在9个序列上测试算法,并且把结果与5个state-of-art方法作比较。根据结果,我们能断定我们的算法比另外的方法更柔韧。
简介:WiththevigorousdevelopmentofequipmentmanufacturingindustryinChina,higherrequirementstotheequipmentsupportabilityareputforward.Howtoevaluatethesupportabilityofequipments(especiallytheaviationequipment-aircraft)objectivelyandcorrectlyistheproblemtobesolvedinthedevelopmentofaviationequipmentsconstruction,demonstrationandbattleapplication.Aimedattheneedsofthesupportabilityanalysisofcomplexequipmentsystems-aircraft,amodelofaircraftsupportconceptevaluationbasedonDEA(dataenvelopmentanalysis)andPCA(principalcomponentanalysis)isproposed.Themodelisusedtoevaluateacertainaircraftsupportconcept.Theprocessandtheresultsofevaluationshowthatproposedmodelisfeasibleandeffective.Themodelissuitableforadvancedaircraftsupportconceptevaluation.Thefeasibilityandeffectivenessoftheproposedmodelisverifiedbytheanalysisoftheevaluationresults.Thismethodisapplicabletotheevaluationofaircraftsupportconcepts.
简介:针对我国企业信用评价问题的特点,文章分析了企业信用评价基本原则和主要影响因素,建立了企业信用评价指标体系。企业信用评价是一类包括一系列独立变量的分类问题,将主成分分析与模糊理论引入信用评价中,构建基于PCA/FCM的企业信用评价模型,这使得模型更接近人们的思维方式、指标赋权更为客观。应用该模型及SPSS11.0、MATLAB7.0对所选企业研究显示:该模型非常有效和实用。
简介:摘要:本文基于主成分分析(PCA)和图像匹配技术,提出了一种飞机识别算法。该算法通过对飞机图像进行PCA降维处理,提取关键特征,并利用图像匹配算法对待识别图像与数据库中的飞机图像进行比对。实验结果表明,该算法在飞机识别任务中具有较高的准确性和鲁棒性,可应用于实际的飞机识别系统中。