学科分类
/ 1
14 个结果
  • 简介:今天的表面贴放机器必须不仅能精确地贴放许多元件,而且要处理逐渐地更小的包装。设备还必须维持它的灵活性来适应那些可望成为电子包装主流的新元件。用户(OEM和合同制造商)正在面临激动的,如果不是困难的,时刻。成功的关键在于贴片设备供应商的满足顾客要求和在更短的领先时间内交付产品的能力。

  • 标签: 顾客要求 供应商 制造商 OEM 产品 合同制
  • 简介:Thispaperpresentsafunctionallanguagefortheunambiguousdescriptionofdigitalcircuits,amethodandalgorithmstoobtainastandard-celllayout,andacomparativeevaluationofthedevelopedfunctionalstandard-cellplacementtechnique.Thepresentedplacementschemeisdifferentfromtraditionalmethodsbecausethecompletelayoutgrometryisspecifiedandconstructedautomaticallyfromafunctionaldescription.Theconstructionreliesonatranslationthatcombinesthesimplicityofstandard-cellswiththeeleganceoffunctionalprogramming.Anevaluationofthemethodintroducedshowsthatthequalityoftheresultingplacementisclosetotheresultsachievedwithsimulatedannealingwhilethecomputationtimeissignificantlyless.Furthermore,theevaluationsuggeststoemploythefunctionalplacementmethodinconjunctionwithlow-temperaturesimulatedannealingforrunning-timereductionandimprovedresults.

  • 标签: 数字电路 标准元件布局 泛涵语言 半导体工业
  • 简介:在最近的年里,与数据的快速的开发集中的应用程序,数据复制成为了一种创新技术让数据格子改进数据可获得性,和还原剂文件转移时间和带宽消费。复制品的放置被证明了是必须被解决认识到数据复制的过程的最困难的问题。这份报纸探讨服务(QoS)的质量在数据格子的知道的复制品放置问题,并且建议动态编程基于不仅让一个QoS要求保证全面复制花费了,而且能最小化的复制品放置算法,包括存储费用和通讯费用。由模拟,实验证明复制品放置算法超过存在在数据的流行复制品放置技术格子。

  • 标签: QOS要求 放置算法 数据密集型 副本 感知 应用
  • 简介:水库工程是在量控制和信息技术过去常描述操作一个开的量系统在以内操作的环境的条款。水库工程在存储量信息被要求的应用是必要的。从控制理论观点,一个量系统能够如果它拥有所谓的decoherence,存储量信息免费分系统(DFS)。这份报纸探索杆放置技术便于经由协调的量反馈的免费分系统控制的decoherence的合成。我们讨论常规开的环途径的限制并且为decoherence建议建设性的反馈设计方法论免费分系统工程。它捕获与decoherence允许系统的相当一般的动态协调反馈结构从没有如此的模式的部件要综合的免费模式。

  • 标签: 量子信息 油藏工程 退相干 配置方法 存储 极点
  • 简介:Withthewideapplicationofvirtualizationtechnologyinclouddatacenters,howtoeffectivelyplacevirtualmachine(VM)isbecomingamajorissueforcloudproviders.Theexistingvirtualmachineplacement(VMP)solutionsaremainlytooptimizeserverresources.However,theypaylittleconsiderationonnetworkresourcesoptimization,andtheydonotconcerntheimpactofthenetworktopologyandthecurrentnetworktraffic.Amulti-resourceconstraintsVMPschemeisproposed.Firstly,theauthorsattempttoreducethetotalcommunicationtrafficinthedatacenternetwork,whichisabstractedasaquadraticassignmentproblem;andthenaimatoptimizingnetworkmaximumlinkutilization(MLU).Ontheconditionofslightvariationofthetotaltraffic,minimizingMLUcanbalancenetworktrafficdistributionandreducenetworkcongestionhotspots,aclassiccombinatorialoptimizationproblemaswellasNP-hardproblem.Antcolonyoptimizationand2-optlocalsearcharecombinedtosolvetheproblem.SimulationshowsthatMLUisdecreasedby20%,andthenumberofhotlinksisdecreasedby37%.

  • 标签: 网络资源优化 数据中心 网络性能 虚拟机 放置 高云
  • 简介:Thispaperinvestigatestheexactandapproximatespectrumassignmentpropertiesassociatedwithrealizableoutput-feedbackpole-placementtypecontrollersforsingle-inputsingle-outputlineartime-invarianttime-delaysystemswithcommensuratepointdelays.Thecontrollersynthesisproblemisdiscussedthroughthesolvabilityofasetofcoupleddiophantineequationsofpolynomials.Anextracomplexityisincorporatedtotheabovedesigntocancelextraunsuitabledynamicsbeinggeneratedwhensolvingtheabovediophantineequations.Thus,thecompletecontrollertracksanyarbitraryprefixed(eitherfiniteordelaydependent)closed-loopspectrum.However,ifthecontrollerissimplifiedbydeletingtheabovementionedextracomplexity,thentherobuststabilityandapproximatedspectrumassignmentarestillachievableforacertainsufficientlysmallamountofdelayeddynamics.Finally,theapproximatespectrumassignmentandrobuststabilityproblemsarerevisitedunderplantdisturbancesifthenominalcontrollerismaintained.Inthecurrentapproach,thefinitespectrumassignmentisonlyconsideredasaparticularcasetothedesigner'schoiceofa(delay-dependent)arbitraryspectrumassignmentobjective.

  • 标签: 极点控制器 线性时滞系统 同步问题 丢番图方程
  • 简介:ObjectivesToinvestthesuccessprocedure,immediateoutcomeafterprocedure,therateofmainadversecardiaceventsafterprocedureandrestenosisafterstentplacementinsmallcoronaryvessels.Methods290patientswithselectedoremergencystentimplantationinsmallvesselsfromApril,1997toMarch,2002.Total299vessels,304lesionsand316stentswerestatisted.Thesuccesssrateofprocedure,immediateoutcomeafterprocedure,therateofmainadversecardiaceventsafterprocedureandrestenosisafterstentplacementinsmallcoronaryvesselswereassessed.Thepatientswerefollowedup1monthto4years.Re-catheterangiographyweredonein122/290patients.ResultsThenarrowrateoflesiondroppedfrom89%±12%beforeprocedureto5%±5%afterprocedure(diameter).202patientswerefollowedup1month(69.7%).197/202casesweresurvival.5/202casesdiedin3hrsto7days.2/5casesdiedofpersistenthypotensionafterprocedure.1/5casediedofacuteleftheartfailure.2/5casesdiedofsuddendeath.180caseswerefollowedup5monthsto4years.Thenon-eventsurvival(NES)ratewas73.3%(132/180).There-angiographyweredonein122cases.Restenosishappenedin39cases(30.3%).37patientsrepeatedPCI.2patientswenttoCABG.2casesgotanginarecurrenceandwereprovedsecondtimerestenosisbyre-angiography.ThethirdtimePCIwasdonein1patient.TheotherpatientswenttoCABG.1casediedofchronicheartfailureafter2years.1casesufferedacutemyocardialinfarctiononarterystentimplanted.ConclusionsTherearehighsuccessrateofprocedureandperfectimmediateoutcomeinstentplacementinsmallvessels.Mainadversecardiaceventsdidnotincreased.Non-eventsurvialwassatisfiedinlongtermfollow-up.Restenosisratewasshowedslightlyhigherthantheoneofmainvessels.

  • 标签: 不良心脏事件 血管造影 支架置入术 小冠状血管 临床研究
  • 简介:ThispaperdiscussestheplacementofChineseannotationfrompointofviewofgraphics.AreaFeatureisclassifiedassimplepolygon,complexpolygonandspecialpolygon.Forsimpleones,annotationsareplacedalongthelongestedge.Forcomplexones,firstlythepolygonaresimplifiedaccordingtoclosepoints,thenthelongestdiagonalisgottenbycomparinglength,lastly,annotationsareplacedalonglong-diagonal.Forspecialones,thepolygonarepartitionedintoseveralpartsbyacertainruleforgettingtheirsub-diagonals,thentheirannotationareplacedbymeansofthesecond.

  • 标签: 地球信息系统 GIS 自动定位 对角线 地图
  • 简介:BackgroundThrombocytopeniaisacommoncomplicationofIABP.Untilnow,thereisnounifiedconclusionsabouttheincidence,characteristics,riskfactorsandtheprognosisofIABPrelatedthrombocytopenia.MethodsInthisstudy,thedataofpatientswithACSundergoingPCIandIABPwereretrospectivelyanalyzed.Allenrolledpatientsweredividedintothrombocytopeniagroupandnon-thrombocytopeniagroupaccordingtotheoccurrenceofthrombocytopeniaafterinsertionofIABP.Thebaselinedataofthetwogroupswerecompared,andthepossibleriskfactorsofthrombocytopeniaandtheirimpactonprognosiswereanalyzedbychi-squaretestandlogisticregressionanalysis.ResultsSixty-twopatientswereenrolledinthisstudy.TherateofIABPassociatedthrombocytopeniawas25.8%(16/62)ofallpatients.OlderagewasanindependentriskfactorofIABPassociatedthrombocytopenia(OR:3.625;95%confidenceinterval:1.016-12.935;P=0.047).TheincidenceofTIMIbleedingeventswashigherinthrombocytopeniagroup[75.0%(12/16)vs.43.5%(20/46),P=0.042].Therateofin-hospitaldeathwassimilarbetweenthetwogroups[18.8%(3/16)vs.17.4%(8/46),P=1.0].ConclusionIABPassociatedthrombocytopeniaoccursin25.8%ofpatientswithACSundergoingPCIandcorrelateswithincreasedTIMIbleedingevents.OlderagemaypredictIABPassociatedthrombocytopenia.

  • 标签: acute coronary syndrome intra-aortic BALLOON PUMPING
  • 简介:AbstractPurpose:Determine the impact of upper eyelid weight placement at 3 months post onset of idiopathic facial paralysis (IFP) on the recovery of facial function in patients with lagophthalmos.Methods:This is a retrospective review of patients with incomplete recovery of IFP—defined as a Sunnybrook Facial Grading Scale (FGS) score of less than 100, 3 months after onset. Only patients with FGS and Facial Clinimetric Evaluation (FaCE) scores recorded at 3 and 12 months were included. Patients were categorized into 3 groups: Group A, lagophthalmos with eyelid weight placement; Group B, lagophthalmos without eyelid weight placement; Group C, complete eye closure (CEC) without eyelid weight placement. The eye comfort domain and composite score of the FaCE questionnaire were analyzed. Voluntary eye closure, synkinesis with eye closure, overall synkinesis and the composite score of the FGS were also analyzed. Paired two-tailed t-test was used to evaluate the data comparing the 3 and 12 month FaCE and FGS scores within and between the 3 groups.Results:The change in composite FGS score significantly increased from month 3 to month 12 in Group A as compared to Group B (37 vs 4.25, P = 0.01). While Group A had significantly lower eye comfort (-12.5, P = 0.01), voluntary eye closure (-1.75, P = 0.05) and overall FGS scores (-28.75, P = 0.04) at 3 months compared to those in Group C, there were no differences between these two groups at 12 month follow-up.Conclusions:For patients with lagophthalmos at 3 months, early eyelid weight placement may lead to improved facial function at 12 months.

  • 标签: Facial paralysis Synkinesis Eyelid weight
  • 简介:BackgroundPreviousstudieshaveimplicatedastronglinkbetweencirculatingplasmaresistinandcoronaryarterydisease(CAD).Theaimofthisstudywastoinvestigatewhetherresistinelevationpredictsworseoutcomeofstent-placementinacutecoronarysyndrome(ACS)patients.MethodsTotally126ACSparticipantswhowereeligibleforstent-placementwereenrolledfor2years'follow-upbymonitoringclinicalendpointsoccurringviaoutpatientvisitsor/andtelephonecall.Baselinecharacteristicswerecollected.Allparticipantsweredividedintolowresistingroup(<3.464μg/mL)andhighresistingroup(>3.464μg/mL).Clinicalendpointsintermsofmajoradversecardiovascularevents(MACE),cardiovasculardeath,non-fatalmyocardialinfarction,ischemicstroke,andcoronaryrevascularization(CR)werecompared.ResultsPatientswithstenosisinthreevesselspresentedmorefrequentlyinhighresistingroupthaninlowresistingroup(35.6%vs.48.3%,P=0.001).IncidencesofMACEandCRweresignificantlyhigherinhighresistingroupthanthoseinlowresistingroup(31.6%vs.18.8%,P=0.018);15%vs.7.58%,P=0.006).ConclusionsInpatientswithbaselineresistinelevation,theincidenceofMACEissignificantlyincreasedafterstent-placement.

  • 标签: 急性冠脉综合征 心血管 发生率 患者 支架 事件
  • 简介:Thereformcoreofstate-ownedenterprisesistodevelopmixed-ownership’seconomyeffectively,thereforetherearesomanylarge-andmedium-sizedstate-ownedenterprisesusingavarietyofresources,adoptingvariouswaystorealizemixed-ownershipreforms,enrichingthetheoriesofmixed-ownershipreform,andcreatingalargenumberofpracticalsamples.WuliangyeCompany,asaveryfamousmakingliquorcompanyinChina,hasissuedalargeofnewstockstoexcellentdealers,administrativestaffs,andoutstandingemployees,sothatthecompanycandrawintomassiveprivatecapitalin2016,soWuliangyeCompanyhavemadethefirststepaboutmixed-ownershipreformamongChinesestate-ownedenterprises.Throughcomparingthequantityofmonetarycapitalandasset-liabilityratioofWuliangyeCompanybeforeandafterdirectionalissuingnewstocks,thedistrustaboutonlyaddingmoneyandwelfaretoolforrelativebenefitpeoplecanbeeliminated.Moreover,theaffectionofdirectionalissuingnewstockscanpromoteWuliangyeCompanydealersandemployeestoholdshareholdings,andoptimizeownershipstructure.WuliangyeCompanyhasgottheexplorationforoptimizingequitystructuretosolidfoundationforspeedingupstated-ownedenterprisesreformpaces,alsoprovidingsomeusefulexperiencesofothermixed-ownershipreform,andthewaysandpatternsareworthyoflearningandstudying.

  • 标签: STATE-OWNED enterprises mixed-ownership REFORM Wuliangye LISTED
  • 简介:Theauthorswouldliketothankthediscusserforhisconsiderationsandcomments.Thediscusserbelievesthatsomeofthederivedformulationsneedtobereferredtohispreviouslypublishedworksandalsosomerelatedstudieshavenotbeencited.Uptotheknowledgeoftheauthors,theideaofdrift-basedequationsofmotionpresentedinthepaperisnew.Whilemathematicalaspectsoftheideaaresimple,itsspecificformwouldgreatlyaccelerate

  • 标签: 阻尼特性 地震激励 最佳位置 SA 速度