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.