学科分类
/ 1
15 个结果
  • 简介:Thenestednesspropertyhasbecomeanincreasinglyimportantmeansfordevisingefficientalgorithmsfornetworklocationproblems.Therehavebeenattemptstoexplorethenestednesspropertyofnetworklocationproblemswithsomespecialcasesoftheconvexorderedmedianobjectives.However,thereislittleresearchonthenestednesspropertyforthoseproblemswiththeconcaveorderedmedianobjectives.ThispaperconstructsatreenetworkTandshowsthatthenestednesspropertycannotholdfortheconcaveorderedmedianproblem,whichfillsagapintheresearchonthenestednessproperty.Finally,theauthorsposeanopenproblemonidentifyingthenestednesspropertyforthecontinuousstrategicorderedmedianproblem.

  • 标签: 网络问题 属性表 中位数 嵌套 有序 注记
  • 简介:Fordirectsequencespreadspectrum(DSSS)receivers,thecapabilityofrejectingnarrow-bandinterferencecanbesignificantlyimprovedbyaprocessoffrequency-domaininterferencesuppression(FDIS).Thekeyissueofthisprocessishowtodetermineathresholdtoeliminateinterferenceinthefrequencydomain,whichhasbeenextensivelystudied.However,thesepreviousmethodsaretediousorverycomplex.Asimpleandefficientalgorithmbasedonmediansisproposed.Theeliminationthresholdisonlyrelatedtothemedianbyascalefactor,whichcanbeobtainedbythenumericalanalysis.Simulationresultsshowthatthealgorithmprovidesexcellentnarrow-bandinterferencesuppressionwhileonlyslightlydegradingthesignal-to-noiseratio(SNR).Aone-passalgorithmusinglogarithmicsegmentationisfurtherderivedtoestimatemedianswithlowcomputationalcomplexity.Finally,theFDISisimplementedinafieldprogrammablegatearray(FPGA)ofXilinx.ExperimentsarecarriedoutbyconnectingtheFDISFPGAtoaDSSSreceiver,andtheresultsshowthatthereceiverhasaneffectivecountermeasurefora60dBinterference-to-signalratio(ISR).

  • 标签: 扩频接收机 自适应阈值 分割算法 DSSS 中位数 窄带干扰抑制
  • 简介:Objective:Toanalyzequantitativelythesynergisticandantagonisticeffectsofcombinedoxymatrine(OMT)and5-fluorouracil(5-GU)onacelllineofhumanlivercancer(HepG2)withmedian-effectprincipleinvitro.Methods:Themedian-effectprincipleandMTTmethodwereusedinthequantitativeanalysisofeffectsofthetwodrugs.Results:Cytotoxicactivityoftheindividualdrugsenhancedasdrugconcentrationincreased.Asfa=0.41,aCIequalto1indicatedadditivity;fa<0.41,aCIlessthan1indicatedsynergy;andfa>0.41,aCIgreaterthan1indicatedantagonism.Thesequenceofadministrationdidnotinfluencethecytotoxicactivityofthecombinedantitumordrugs.Theratioofdrugconcentrationwasafactorthatcaninfluencethekillingeffect.Conclusion:Thecombineddrugsinteraction(CI<1)wassynergisticatlowerconcentrationandantagonisticathigherconcentration.Theratioofdrugconcentrationisafactorthatcaninfluencethekillingeffect.

  • 标签: 定量检查 抗癌抗菌素 氧化苦参碱 药物治疗
  • 简介:Thegravityp-medianmodelisanimportantimprovementtothewidely-usedp-medianmodel.However,thereisstilladebateonitsvalidityinempiricalapplications.Previousstudiesevendoubtthesignificanceofthegravityp-medianmodel.UsingacasestudyoftertiaryhospitalsinShenzhen,China,thisstudyre-examinesthedifferencebetweenthegravityp-medianmodelwiththep-medianmodel,bydecomposingthedifferencebetweenthetwomodelsintogravityruleandvariantattraction.Thisstudyalsoproposesamodifiedgravityp-medianmodelbyincorporatingadistancethreshold.Theempiricalresultssupportthevalidityofthegravityp-medianmodel,andalsorevealthatonlywhentheattractionsofcandidatefacilitylocationsarevariablewillthegravityp-medianmodelleadtodifferentresultswiththep-medianmodel.Thedifferencebetweenthemodifiedgravityp-medianmodelandthegravityp-medianmodelisalsoexamined.Moreover,theimpactsofthedistance-decayparameteranddistancethresholdonsolutionsareinvestigated.Resultsindicatethatalargerdistance-decayparametertendstoresultinamoredisperseddistributionofoptimalfacilitiesandasmalleraveragetraveltime,andasmallerdistancethresholdcanbetterpromotethespatialequityoffacilities.Theproposedmethodcanalsobeappliedinstudiesofothertypesoffacilitiesorinotherareas.

  • 标签: location-allocation SPATIAL optimization GRAVITY P-MEDIAN DISTANCE
  • 简介:药的效果的研究,kanamycin,在recombinantEscherichiacoli的生长新陈代谢上,B1被对待的细胞的新陈代谢的活动监视的microcalorimeter执行。种recombinantEscherichiacoli房间暂停的力量时间曲线,与不同kanamycin剂量对待,被记录。效果的程度被变化在microcalorimetric曲线的斜坡评估,药行动的动力学从这些变化在到达了他们的最大的价值并且维持了他们的最大的价值的时间被解释。试验性的剂量效果关系遵循集体行动的法律的中部效果的原则:fa/(1?fa)=(D/D50)m。y=lg的一个阴谋[(fa)1?1]?1对x=lgD给斜坡m,D50和R。试验性的结果表明kanamycin的高集中在lg阶段在recombinantEscherichiacoliB1的生长上有禁止的效果,并且在静止时期有支持的效果。而且,microcalorimetry是为在生物学的调节效果的察觉的一个可靠方法,这被表明。

  • 标签: 卡那霉素 微量热法 药效评价 重组大肠埃希氏菌 中效原理 剂量效应
  • 简介:Thisstudyproposesapost-processortoimprovetheharmonicstructureofavowelinanenhancedspeech,enablingthespeechqualitytobeimproved.Initially,aspeechenhancementalgorithmisemployedtoreducethebackgroundnoiseforanoisyspeech.Hencetheenhancedspeechispost-processedbyahybrid-medianfiltertoreducethemusicaleffectofresidualnoise.Sincetheharmonicspectraareimpactedbybackgroundnoiseandaspeechenhancementprocess,thequalityofavowelisdeteriorated.Aharmonicregeneratedmethodisdevelopedtoimprovethequalityofpost-processedspeech.Experimentalresultsshowthattheproposedmethodcanimprovethequalityofpost-processedspeechbyadequatelyregeneratingharmonicspectra.

  • 标签: 中值滤波器 再生方法 谐波 混合 语音质量 背景噪声
  • 简介:TheJiamusimcdianmassifislocatcdaboutlittlcXinganlingtoLaoycling,casternHeilongjiangProvince.Beinginaccordwiththediwathcory,thcJiamusipalaco-mcdianmassifdevclopspre-geosyn-clinlarchacansialiccrust.KhondalitescricsinthcJiXidistrictmaybcrcputcdasrcprcscntivc,isotopicageofwbichis25OOMa.ThcrcarethcDongfc

  • 标签:
  • 简介:Inthisstudy,ratswereputintotraumaticbraininjury-inducedcomaandtreatedwithmediannerveelectricalstimulation.Weexploredthewake-promotingeffect,andpossiblemechanisms,ofmediannerveelectricalstimulation.Electricalstimulationupregulatedtheexpressionlevelsoforexin-AanditsreceptorOX1Rintheratprefrontalcortex.Orexin-Aexpressiongraduallyincreasedwithincreasingstimulation,whileOX1Rexpressionreachedapeakat12hoursandthendecreased.Inaddition,aftertheOX1Rantagonist,SB334867,wasinjectedintothebrainofratsaftertraumaticbraininjury,fewerratswererestoredtoconsciousness,andorexin-AandOXIRexpressionintheprefrontalcortexwasdownregulated.Ourfindingsindicatethatmediannerveelectricalstimulationinducedanup-regulationoforexin-AandOX1Rexpressionintheprefrontalcortexoftraumaticbraininjury-inducedcomarats,whichmaybeapotentialmechanisminvolvedinthewake-promotingeffectsofmediannerveelectricalstimulation.

  • 标签: 创伤性脑损伤 正中神经 电刺激 大鼠 机制 昏迷
  • 简介:Ourpreviousstudieshaveconfirmedthatduringnervetranspositionrepairtoinjuredperipheralnerves,theregeneratednervefibersofmotorneuronsintheanteriorhornofthespinalcordcaneffectivelyrepairdistalnerveandtargetmuscletissueandrestoremusclemotorfunction.Toobservetheeffectofnerveregenerationandmotorfunctionrecoveryafterseveraltypesofnervetranspositionformediannervedefect(2mm),30Sprague-Dawleyratswererandomlydividedintoshamoperationgroup,epineurialneurorrhaphygroup,musculocutaneousnervetranspositiongroup,medialpectoralnervetranspositiongroup,andradialnervemuscularbranchtranspositiongroup.Threemonthsafternerverepair,thewristflexiontestwasusedtoevaluatetherecoveryofwristflexionafterregenerationofmediannerveintheaffectedlimbsofrats.Thenumberofmyelinatednervefibers,thethicknessofmyelinsheath,thediameterofaxonsandthecross-sectionalareaofaxonsintheproximalanddistalsegmentsoftherepairednervesweremeasuredbyosmicacidstaining.Theratioofnewlyproduceddistalmyelinatednervefiberstothenumberofproximalmyelinatednervefiberswascalculated.Wetweightsoftheflexordigitorumsuperficialismusclesweremeasured.Musclefibermorphologywasdetectedusinghematoxylin-eosinstaining.Thecross-sectionalareaofmusclefiberswascalculatedtoassesstherecoveryofmuscles.Resultsshowedthatwristflexionfunctionwasrestored,andthenervegrewintothedistaleffectorinallthreenervetranspositiongroupsandtheepineurialneurorrhaphygroup.Thereweredifferencesinthenumberofmyelinatednervefibersineachgroup.Themagnificationofproximaltodistalnerveswas1.80,3.00,2.50,and3.12inepineurialneurorrhaphygroup,musculocutaneousnervetranspositiongroup,medialpectoralnervetranspositiongroup,andradialnervemuscularbranchtranspositiongroup,respectively.Nevertheless,axondiametersofnewnervefibers,cross-sectionalareasofaxons,thicknessesofmyelinsheath,wet

  • 标签: NERVE REGENERATION TRANSPOSITION repair MEDIAN NERVE
  • 简介:Earthquakeengineershavemadealotofeffortstoderiveacomprehensivesetofclosedformexpressionsforperformanceevaluationofframes,whicharealreadypresentedinguidelinessuchasSAC/FEMA.Theseanalyticalexpressionshavebeendevelopedtoestimatetheannualprobabilityofexceedingalimitstate.Intheprocessofsuchseismicassessments,someessentialassumptionsareadoptedtosimplifytheprocess.Oneofthesefundamentalassumptionsdeclaresthatdriftdemandatanyseismicintensitylevelfollowsalognormaldistributionarounditsmedian.Toinvestigatethevalidityofthisassumption,thispaperdescribesacasestudyofthetypesoferrorsthatcouldbeproducedbyusingthesamplemedianasthecentraltendency.BasedontheMaximumLikelihoodEstimationmethodaswellasotherstatisticalevidence,thispaperproposestheuseofthesamplegeometricmeaninsteadofthesamplemedianforthecentraltendency.Further,theresultsofseismicreliabilityevaluationsof4sampleframesarecomparedbasedonutilizingboththegeometricmeanandthesamplemedian.Inthisprocess,bothfirstandsecondorderpowerlawfitsofthehazardcurveareimplementedtocomparetheeffectsofhazardestimationandtheselectionofthecentraltendencyonthefinalresults.Itisobservedintheapplicationexamplethatthesamplegeometricmeancouldleadtomoreaccurateresults.

  • 标签: seismic reliability closed-form expression SAC/FEMA limit
  • 简介:

  • 标签: