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简介:InthisreportweintendtodiscussadeploymentoftheGlobustoolkitsinregionalgridstructuredevotedforLHCphysicsanalysis,Oneofourpeculiaritiesispoornetworkconnectivityinbetweentwopartsofexperimentalcomputingnodes,Inearlystageofdeploymentwemetseveraltechnicaldifficultiesduetoseveralbugsandmalfunctions.AtPNPItheownCertificateAuthority(CA)wascreated.
简介:AU.S.deploymentofaTHAADsysteminSouthKoreawouldprovethatitsanti-missilesystemisatleastpartlyaimedatoffsettingChina’sdeterrentcapabilities.ATHAADplatformwilldolittletoimproveSouthKorea’smilitarydeterrencewithNorthKorea;ratheritwillmeanitwillpushChinatotakecountermeasures,usheringinanewarmsraceinNortheastAsiaandposingaseveretesttoregionalsecurity.
简介:MostofthecurrentdeploymentschemesforWirelessSensorNetworks(WSNs)donottakethenetworkcoverageandconnectivityfeaturesintoaccount,aswellastheenergyconsumption.Thispaperintroducestopologycontrolintotheoptimizationdeploymentscheme,establishesthemathe-maticalmodelwiththeminimumsumofthesensingradiusofeachsensors,andusesthegenetical-gorithmtosolvethemodeltogettheoptimalcoveragesolution.Intheoptimalcoveragedeployment,thecommunicationandchannelallocationarefurtherstudied.Thentheenergyconsumptionmodelofthecoverageschemeisbuilttoanalyzetheperformanceofthescheme.Finally,theschemeissimulatedthroughthenetworksimulatorNS-2.Theresultsshowtheschemecannotonlysave36%energyav-eragely,butalsoachieve99.8%coveragerateundertheconditionof45sensorsbeingdeployedafter80iterations.Besides,theschemecanreducethefivetimesinterferenceamongchannels.
简介:Thespacecraftwithmultistagesolarpanelshavenonlinearcouplingbetweenattitudesofcentralbodyandsolarpanels,especiallytherotationofcentralbodyisconsideredinspace.Thedynamicsmodelisbasedfordynamicsanalysisandcontrol,andthemultistagesolarpanelsmeansthedynamicsmodelingwillbeverycomplex.Inthisresearch,theLiegroupvariationalintegratormethodisintroduced,andthedynamicsmodelofspacecraftwithsolarpanelsthatconnectstogetherbyflexiblejointsisbuilt.Themostobviouscharacterofthismethodisthattheattitudesofcentralbodyandsolarpanelsarealldescribedbythree-dimensionalattitudematrix.Thedynamicsmodelsofspacecraftwithoneandthreesolarpanelsareestablishedandsimulated.ThestudyshowsLiegroupvariationalintegratormethodavoidsparameterscouplingandeffectivelyreducesdifficultyofmodeling.TheobtainedcontinuousdynamicsmodelbasedonLiegroupisasetofordinarydifferentialequationsandequivalentwithtraditionaldynamicsmodelthatoffersabasisforthegeometrycontrol.
简介:Anovelbionicswarmintelligencealgorithm,calledantcolonyalgorithmbasedonablackboardmechanism,isproposedtosolvetheautonomyanddynamicdeploymentofmobilessensornetworkseffectively.Ablackboardmechanismisintroducedintothesystemformakingpheromoneandcompletingthealgorithm.Everynode,whichcanbelookedasanant,makesoneinformationzoneinitsmemoryforcommunicatingwithothernodesandleavespheromone,whichiscreatedbyantitselfinnature.ThenantcolonytheoryisusedtofindtheoptimizationschemeforpathplanninganddeploymentofmobileWirelessSensorNetwork(WSN).Wetestthealgorithminadynamicandunconfigurableenvironment.Theresultsindicatethatthealgorithmcanreducethepowerconsumptionby13%averagely,enhancetheefficiencyofpathplanninganddeploymentofmobileWSNby15%averagely.
简介:Duetothelongoperationcycleofmaritimetransportationandfrequentfluctuationsofthebunkerfuelprice,therefuelingexpenditureofacharteredshipatdifferenttimeorportsofcallmakesignificantdifference.Fromtheperspectiveofshippingcompany,anoptimalsetofrefuelingschemesforashipfleetoperatingondifferentvoyagecharterroutesisanimportantdecision.Toaddressthisissue,thispaperpresentsanapproachtooptimizetherefuelingschemeandtheshipdeploymentsimultaneouslywithconsideringthetrendoffuelpricefluctuations.Firstly,anARMAmodelisappliedtoforecastatimeserialsofthefuelprices.Thenamixed-integernonlinearprogrammingmodelisproposedtomaximizetotaloperatingprofitoftheshippingcompany.Finally,acasestudyonachartercompanywiththreebulkcarriersandthreevoyagecharterroutesisconducted.Theresultsshowthattheoptimalsolutionsavesthecostof437,900USDcomparedwiththetraditionalrefuelingscheme,andverifytherationalityandvalidityofthemodel.
简介:Thespinningsolarsailoflargescalehasbeenwelldevelopedinrecentyears.Suchasolarsailcanbeconsideredasarigid-flexiblemultibodysystemmainlycomposedofaspinningcentralrigidhub,anumberofflexiblethintethers,sailmembranes,andtipmasses.Asimplifiedinterplanetarykite-craftacceleratedbyradiationoftheSun(IKAROS)modelisestablishedinthisstudybyusingtheabsolute-coordinate-based(ACB)methodthatcombinesthenaturalcoordinateformulation(NCF)describingthecentralrigidhubandtheabsolutenodalcoordinateformulation(ANCF)describingflexibleparts.Theinitialconfigurationofthesysteminthesecond-stagedeploymentisdeterminedthroughbothdynamicandstaticanalyses.Thehugesetofstiffequationsofsystemdynamicsissolvedbyusingthegeneralized-alphamethod,andthusthedeploymentdynamicsofthesystemcanbewellunderstood.
简介:TheHumisawidespreadphenomenon,reportedinmanypartsoftheworld.Itmanifestsitselfintheformofahum,rumbleandpulsing,oftenfeltasasensationmorethananaudiblesound.Startingin2011,residentsofWindsor,Ontario,Canadastartedreportingintermittentlowfrequencysound,widelyreferredtoastheHum(anddubbedtheWindsorHum).Thisreportoutlinesthedeploymentofashorttermgeophysicalfieldsurvey,performedduring2013inWindsor,Ontario,Canada,aimedatmonitoringtheairwavesignalsassociatedwiththeWindsorHum.Thesummaryofthelowfrequencysoundarraydeploymentispresentedanddiscussed.
简介:AMonteCarloAnalysisofnodesdeploymentforlarge-scaleandnon-homogeneouswirelesssensornetworks,hasbeendone.Throughsimulationsofrandomdeploymentsofnodesoverasquareareausingdifferentdensities,assumingthatournetworkiscomposedbyAnchornodes(specialsensorswithknownposition)andsimpleSensornodes,thelatteraresupposedtoestimatetheirownpositionafterbeingplacedwithinthecoverageareawiththeminimumAnchornodesneededto'feed'themwiththenecessaryinformation.Thegoalisthentoassistdecision-makersinselectingamongdifferentalternativestodeploythenetworks,accordingtoresourcesfeaturesandavailability,hencethismethodprovidesanestimatevalueofhowmanyAnchornodesshouldbedeployedinagivenareatotriggerthelocationalgorithminthegreatestpossiblenumberofSensornodesinthenetwork.
简介:浮标系统的推广是为浮标系统的操作的最重要的过程之一。在现在的学习,包含表面浮标的一个单个点的绳索浮标系统,有部件的电报片断,锚被使用多身体动力学等等建模方法。运动方程在分离节点描述和充分笛卡儿的坐标被开发。然后数字的方法被用来解决平常的微分方程,当锚从董事会正在扔时,动力学模拟被完成。没有电流并且与在浮标系统的电流的不同节点的轨道和速度被获得。电缆线的每部分的短暂紧张力量在推广的进程被分析。当锚正在摸海床和力量将与不同漂浮配置改变的最大的紧张时,数字结果显示短暂收费载重增加到山峰价值。这个工作对浮标系统计划的设计和推广有用。