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簡介:FIELDSTATICLOADTESTONKAOPINGHSICABLESTAYEDBRIDGEIKUANGFANG1CHUNRAYCHEN2ANDISHANGCHANG3ABSTRACTFIELDLOADTESTINGISANEFFECTIVEMETHODFORUNDERSTANDINGTHEBEHAVIORANDFUNDAMENTALCHARACTERISTICSOFACABLESTAYEDBRIDGETHISPAPERPRESENTSTHERESULTSOFFIELDSTATICLOADTESTSONTHEKAOPINGHSICABLESTAYEDBRIDGE,THELONGESTCABLESTAYEDBRIDGEINTAIWAN,BEFOREITWASOPENTOTRAFFICATOTALOF40LOADINGCASES,INCLUDINGTHEUNITANDDISTRIBUTEDBENDINGANDTORSIONLOADINGEFFECTS,WERECONDUCTEDTOINVESTIGATETHEBRIDGEBEHAVIORTHEATMOSPHERICTEMPERATUREEFFECTONTHEVARIATIONSOFTHEMAINGIRDERDEFLECTIONSWASALSOMONITOREDTHERESULTSOFSTATICLOADTESTINGINCLUDETHEMAINGIRDERDEFLECTIONS,THEFLEXURALSTRAINSOFTHEPRESTRESSEDCONCRETEGIRDER,ANDTHEVARIATIONSOFTHECABLEFORCESATHREEDIMENSIONALFINITEELEMENTMODELWASDEVELOPEDTHERESULTSSHOWTHATTHEBRIDGEUNDERTHEPLANNEDLOADTESTCONDITIONSHASLINEARSUPERPOSITIONCHARACTERISTICSANDTHEANALYTICALMODELSHOWSAVERYGOODAGREEMENTWITHTHEBRIDGERESPONSESFURTHERDISCUSSIONOFDEFLECTIONANDCABLEFORCESOFTHEDESIGNSPECIFICATIONSFORACABLESTAYEDBRIDGEISALSOPRESENTEDDOI101061/ASCE10840702200496531CEDATABASESUBJECTHEADINGSBRIDGES,CABLESTAYEDFINITEELEMENTMETHODSTATICLOADSLOADTESTSMONITORINGTAIWANINTRODUCTIONMODERNCABLESTAYEDBRIDGES,AESTHETICALLYAPPEALINGANDTECHNICALLYINNOVATIVE,HAVEBECOMEINCREASINGLYPOPULARWORLDWIDEINTHEPASTDECADESTROITSKY1977GIMSING1999BECAUSEOFIMPROVEMENTSINANALYSISTOOLSANDCONSTRUCTIONTECHNOLOGY,THESPANLENGTHOFCABLESTAYEDBRIDGESHASBECOMEMUCHLONGERWITHINCREASINGSPANLENGTH,THEBEHAVIOROFCABLESTAYEDBRIDGESBECOMESMORECOMPLEX,ANDTHEFUNDAMENTALCHARACTERISTICSSUCHASSTIFFNESS,VARIATIONSOFCABLEFORCES,ANDSTABILITYOFCABLESTAYEDBRIDGESBECOMEMOREIMPORTANTFOREVALUATINGTHESAFETYOFTHESEBRIDGESINGENERAL,FIELDLOADTESTINGISANEFFECTIVEMETHODTOINVESTIGATETHEFUNDAMENTALBEHAVIORANDTOESTABLISHTHEESSENTIALDATAOFACABLESTAYEDBRIDGEINADDITION,FORLONGSPANCABLESTAYEDBRIDGES,ESTABLISHINGAFINITEELEMENTMODELCORRELATEDREASONABLYWITHTHERESULTSOFFIELDLOADTESTSISIMPORTANTFORFUTUREMAINTENANCEWORKDURINGTHEPASTDECADE,SOMERESULTSOFFIELDLOADTESTSANDANALYTICALMODELSHAVEBEENREPORTEDFORLARGECABLESTAYEDBRIDGESHULSEYANDDELANEY1993PRESENTEDSTATICLOADTESTRESULTSANDCOMPARISONSWITHATWODIMENSIONALFINITEELEMENTMODELFORTHECAPTAINWILLIAMMOORECREEKCABLESTAYEDBRIDGECHANGETAL2001ANDZHANGETAL2001PRESENTEDTHEAMBIENTVIBRATIONTESTANDTHREEDIMENSIONAL3DFINITEELEMENTMODELFORTHEKAPSHUIMUNCABLESTAYEDBRIDGEINHONGKONGCUNHAETAL2001DESCRIBEDAMBIENTANDFREEVIBRATIONTESTRESULTS,SHOWINGGOODCORRELATIONWITHTHE3DFINITEELEMENTMODEL,FORTHEVASCODAGAMABRIDGEWORSAKETAL1992SUMMARIZEDTHEMODELINGOFTHECOMPONENTSOFAFINITEELEMENTMODEL,IE,THEPYLON,DECK,JOINTS,ANDCABLES,FORCABLESTAYEDBRIDGESCHANGESINTHESTAYEDCABLEFORCESCANRESULTINSIGNIFICANTVARIATIONSOFTHEINTERNALFORCESINBOTHTHEPYLONANDTHEDECKCASAS1994SHOWEDTHATA10CHANGEINCABLEFORCESWOULDCAUSEALMOST100VARIATIONSOFMOMENTINTHEPYLONANDABOUT300VARIATIONSOFMOMENTINTHEDECKBOTHDURINGTHECONSTRUCTIONSTAGEOFACABLESTAYEDBRIDGEANDAFTERITISOPENEDTOTRAFFIC,ITISIMPORTANTTOACCURATELYASSESSTHEFORCESCARRIEDBYTHESTAYEDCABLESTODATE,THEREAREMANYMETHODSTOEVALUATETHECABLEFORCESFORCABLESTAYEDBRIDGES,SUCHASMEASUREMENTOFTHEFORCEINTHETENSIONINGJACK,APPLICATIONOFALOADCELLATTHEANCHORAGEDEVICE,MEASUREMENTOFELONGATIONOFTHECABLESDURINGTENSIONINGANDINSTALLATIONOFSTRAINGAUGESINTHESTRANDS,ETCSOMERESEARCHERSHAVEPRESENTEDDIFFERENTMETHODOLOGIESINMEASURINGTHEFORCESOFTHESTAYEDCABLESBASEDONTHEVIBRATIONMETHODSHINKEETAL1980CASAS1994SHIMADA1994ZUIETAL1996OFTHESE,THEAMBIENTVIBRATIONMETHODBASEDONTHEVIBRATINGCHORDTHEORYISARELATIVELYSIMPLEANDAPPROPRIATETECHNIQUETOASSESSTHEFORCESINTHESTAYEDCABLESCASAS1994THEEFFECTIVELENGTHANDNATURALFREQUENCIESOFTHESTAYEDCABLESARETHEMOSTIMPORTANTFACTORSRELATEDTOTHEACCURACYOFTHEPREDICTIONOFCABLEFORCESTHISPAPERPRESENTSTHECONFIGURATIONANDRESULTSOFFIELDSTATICLOADTESTSONTHEKAOPINGHSICABLESTAYEDBRIDGEINTAIWANTHERESPONSESOFTHELOADTESTINCLUDEDEFLECTIONSOFTHEDECK,LONGITUDINALSTRAINSOFTHEPRESTRESSEDCONCRETEPCGIRDER,ANDVARIATIONOFTHECABLEFORCESTHEEFFECTIVELENGTHANDNATURALFREQUENCIESOFTHESTAYEDCABLESAREINVESTIGATEDTHEMEASUREDDEFLECTIONANDCABLEFORCESRELATEDTOTHEDESIGNSPECIFICATIONSOFTHECABLESTAYEDBRIDGEAREALSODISCUSSEDATHREEDIMENSIONALFINITEELEMENTMODELWASESTABLISHEDUSINGTHESAP2000PLUSPROGRAMANDCORRELATEDWITHTHERESULTSOFSTATICLOADTESTSFORFUTURERESEARCH1PROFESSOR,DEPTOFCIVILENGINEERING,NATIONALCHENGKUNGUNIV,TAINAN701,TAIWAN,ROCEMAILFANGLOUMAILNCKUEDUTW2DOCTORALCANDIDATE,DEPTOFCIVILENGINEERING,NATIONALCHENGKUNGUNIV,TAINAN701,TAIWAN,ROC3FORMERLY,GRADUATESTUDENT,DEPTOFCIVILENGINEERING,NATIONALCHENGKUNGUNIV,TAINAN701,TAIWAN,ROCNOTEDISCUSSIONOPENUNTILAPRIL1,2005SEPARATEDISCUSSIONSMUSTBESUBMITTEDFORINDIVIDUALPAPERSTOEXTENDTHECLOSINGDATEBYONEMONTH,AWRITTENREQUESTMUSTBEFILEDWITHTHEASCEMANAGINGEDITORTHEMANUSCRIPTFORTHISPAPERWASSUBMITTEDFORREVIEWANDPOSSIBLEPUBLICATIONONMARCH7,2003APPROVEDONAUGUST26,2003THISPAPERISPARTOFTHEJOURNALOFBRIDGEENGINEERING,VOL9,NO6,NOVEMBER1,2004?ASCE,ISSN10840702/2004/6531–540/1800JOURNALOFBRIDGEENGINEERING?ASCE/NOVEMBER/DECEMBER2004/531JBRIDGEENG20049531540DOWNLOADEDFROMASCELIBRARYORGBYUNIVERSITYOFMELBOURNEON03/10/15COPYRIGHTASCEFORPERSONALUSEONLYALLRIGHTSRESERVEDMENTALDATABASEOFTHEBRIDGEBEFOREITWASOPENEDTOTRAFFICTOFACILITATETHEFUTUREMAINTENANCEANDMANAGEMENTWORKDURINGTHEFIELDSTATICLOADTESTS,AFOURAXLEDUMPTRUCKWITHAPPROXIMATELY320KNAVERAGEWEIGHTWASSELECTEDTOSIMULATETHEAMERICANASSOCIATIONOFSTATEHIGHWAYANDTRANSPORTATIONOFFICIALSAASHTOHS2044LIVELOADCONSIDERINGTHEDIFFICULTYOFOBTAININGTHESAMETYPEOFDUMPTRUCKINARURALAREA,ONLY24TRUCKSWEREEMPLOYEDDURINGTHEFIRSTTWODAYSTATICLOADTESTSFIG3SHOWSTHEAVERAGEAXLELOADSANDAXLESPACINGOFTHEDUMPTRUCKSTHESTATICLOADTESTSINCLUDETHEUNITLOADANDDISTRIBUTEDLOADTESTSTHEUNITLOADTESTWASCONDUCTEDUSINGSIXDUMPTRUCKS,HAVINGATOTALLOADOFABOUT1,920KN,WHICHISEQUIVALENTTOAPPROXIMATELY75AND150OFTHESERVICEBENDINGANDTORSIONALTRUCKLOADOFTHEAASHTOSPECIFICATION,ANDWASUSEDTODEVELOPTHESTRUCTURALINFLUENCELINEFORTHEMAJORBRIDGECOMPONENTSTHEREWEREEIGHTBENDINGANDEIGHTTORSIONALSTATICUNITLOADTESTS,ANDTHECONFIGURATIONSOFSTATICUNITLOADTESTSARESHOWNINFIG4INEACHOFTHESTATICDISTRIBUTEDLOADTESTS,12,18,AND24DUMPTRUCKSWEREUSED,WITHTOTALLOADSOF3,840,5,760,AND7,680KN,WHICHAREEQUIVALENTTOAPPROXIMATELY30–110OFTHESERVICEBENDINGANDTORSIONALLANELOADOFTHEAASHTOSPECIFICATIONSTHEREWERESIXDISTRIBUTEDTORSIONALANDEIGHTDISTRIBUTEDBENDINGLOADTESTSTHECONFIGURATIONSOFSTATICDISTRIBUTEDLOADTESTSAREALSOSHOWNINFIG4,ANDTHEWHOLESTATICLOADTESTITEMSARELISTEDINTABLE1INORDERTOREDUCEDISTURBANCESONTHEMEASUREMENTSOFVARIOUSSENSORSDUETOTRUCKMOVEMENTS,ONCETHEDUMPTRUCKSARRIVEDATTHEPLANNEDPOSITIONSOFTHEBRIDGE,THEPORTABLEAMBIENTVIBRATIONMONITORINGSYSTEMSPC51,CONNECTINGTOEIGHTACCELEROMETERSINSTALLEDALONGTHESOUTHEDGEOFEXTERIORBARRIEROFWHOLEBRIDGE,WASUSEDTODETECTWHETHERTHEMAINGIRDERWASINTHELEASTNOISYSTATEFOLLOWINGTHAT,THEDATAACQUISITIONSYSTEMSBEGANTOCOLLECTDATAINADDITION,INORDERTOAVOIDTHEATMOSPHERICTEMPERATUREEFFECTONTHERESULTSDURINGTHELOADTEST,THEDUMPTRUCKSWEREDRIVENOFFTHEBRIDGEEVERYTWOHOURSSOTHATANEWINITIALSTATEFORTHEFOLLOWINGTESTRESULTSCOULDBEESTABLISHEDINSTRUMENTATIONSANDDATAACQUISITIONSYSTEMTHESIDESPANOFTHEKAOPINGHSICABLESTAYEDBRIDGECONSISTSOF15PRESTRESSEDCONCRETEPCGIRDERSEGMENTSWITHANAVERAGELENGTHOF12MFOREACHSEGMENTINORDERTOSTUDYTHEPCGIRDERRESPONSESUNDERVARIOUSLOADCONDITIONS,13SEGMENTSWERECHOSENTOINSTALLTWOCONCRETESTRAINGAUGESANDTWOSTEELSTRAINGAUGESATTHETOPANDBOTTOMFLANGESOFTHEINTERIORWEBBNCN,NISTHENUMBEROFSEGMENT,ASSHOWNINFIG5MEASUREMENTSFROMTHEMONITORINGINSTRUMENTSINSTALLEDONTHEDECKWEREMANUALLYRECORDEDDURINGTHECONSTRUCTIONSTAGEAFTERTHEBRIDGEWASCOMPLETED,ALLINSTRUMENTSFORSTATICMEASUREMENTSWERECONNECTEDTOADATAACQUISITIONSYSTEMTOFACILITATEDATACOLLECTIONDURINGTHEFIELDLOADTESTDEFORMATIONOFTHEMAINGIRDERWASMONITOREDUSING20REFLECTEDLENSESINSTALLEDATEVERYFIFTHPOINTANDMIDSPANOFTHEEXTERIORBARRIERSOFBOTHFIG3DUMPTRUCKUSEDINTESTSFIG4SCHEMEOFLOADTESTITEMSAUNITTORSIONALLOADTESTLC47BUNITTORSIONALLOADTESTLC43CUNITBENDINGLOADTESTLC410DUNITBENDINGLOADTESTLC414EDISTRIBUTEDTORSIONALLOADTESTLC16FDISTRIBUTEDTORSIONALLOADTESTLC13GCONCENTRATEDBENDINGLOADTESTLC118HDISTRIBUTEDBENDINGLOADTESTLC19ANDIDISTRIBUTEDBENDINGLOADTESTLC112JOURNALOFBRIDGEENGINEERING?ASCE/NOVEMBER/DECEMBER2004/533JBRIDGEENG20049531540DOWNLOADEDFROMASCELIBRARYORGBYUNIVERSITYOFMELBOURNEON03/10/15COPYRIGHTASCEFORPERSONALUSEONLYALLRIGHTSRESERVED
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簡介:INTJADVMANUFTECHNOL200731797–804DOI101007/S0017000502325ORIGINALARTICLEZHIQILIUTATSUYANAKAMURACOMBINATIONOFROBOTCONTROLANDASSEMBLYPLANNINGFORAPRECISIONMANIPULATORRECEIVED22MARCH2005/ACCEPTED1AUGUST2005/PUBLISHEDONLINE15FEBRUARY2006SPRINGERVERLAGLONDONLIMITED2006ABSTRACTTHISPAPERRESEARCHESHOWTOREALIZETHEAUTOMATICASSEMBLYOPERATIONONATWOFINGERPRECISIONMANIPULATORAMULTILAYERASSEMBLYSUPPORTSYSTEMISPROPOSEDATTHETASKPLANNINGLAYER,BASEDONTHECOMPUTERAIDEDDESIGNCADMODEL,THEASSEMBLYSEQUENCEISFIRSTGENERATED,ANDTHEINFORMATIONNECESSARYFORSKILLDECOMPOSITIONISALSODERIVEDTHEN,THEASSEMBLYSEQUENCEISDECOMPOSEDINTOROBOTSKILLSATTHESKILLDECOMPOSITIONLAYERTHESEGENERATEDSKILLSAREMANAGEDANDEXECUTEDATTHEROBOTCONTROLLAYEREXPERIMENTALRESULTSSHOWTHEFEASIBILITYANDEFFICIENCYOFTHEPROPOSEDSYSTEMKEYWORDSMANIPULATORASSEMBLYPLANNINGSKILLDECOMPOSITIONAUTOMATEDASSEMBLY1INTRODUCTIONOWINGTOTHEMICROELECTROMECHANICALSYSTEMSMEMSTECHNIQUES,MANYPRODUCTSAREBECOMINGVERYSMALLANDCOMPLEX,SUCHASMICROPHONES,MICROOPTICALCOMPONENTS,ANDMICROFLUIDICBIOMEDICALDEVICES,WHICHCREATESINCREASINGNEEDSFORTECHNOLOGIESANDSYSTEMSFORTHEAUTOMATEDPRECISIONASSEMBLYOFMINIATUREPARTSMANYEFFORTSAIMINGATSEMIAUTOMATEDORAUTOMATEDASSEMBLYHAVEBEENFOCUSEDONMICROASSEMBLYTECHNOLOGIES1–3HOWEVER,MICROASSEMBLYTECHNIQUESOFHIGHFLEXIBILITY,EFFICIENCY,ANDRELIABILITYSTILLOPENTOFURTHERRESEARCHTHISPAPERRESEARCHESHOWTOREALIZETHEAUTOMATICASSEMBLYOPERATIONONATWOFINGERMICROMANIPULATORAMULTILAYERASSEMBLYSUPPORTSYSTEMISPROPOSEDAUTOMATICASSEMBLYISACOMPLEXPROBLEMWHICHMAYINVOLVEMANYDIFFERENTISSUES,SUCHASTASKPLANNING,ASSEMBLYSEQUENCESGENERATION,EXECUTION,ANDCONTROL,ETCITCANBESIMPLYDIVIDEDINTOTWOPHASESTHEASSEMBLYPLANNINGANDTHEROBOTCONTROLATTHEASSEMBLYPLANNINGPHASE,THEINFORMATIONNECESSARYFORASSEMBLYOPERATIONS,SUCHASTHEASSEMBLYSEQUENCE,ISGENERATEDATTHEROBOTCONTROLPHASE,THEROBOTISDRIVENBASEDONTHEINFORMATIONGENERATEDATTHEASSEMBLYPLANNINGPHASE,ANDTHEASSEMBLYOPERATIONSARECONDUCTEDSKILLPRIMITIVESCANWORKASTHEINTERFACEOFASSEMBLYPLANNINGTOROBOTCONTROLSEVERALROBOTSYSTEMSBASEDONSKILLPRIMITIVESHAVEBEENREPORTED4–6THEBASICIDEABEHINDTHESESYSTEMSISTHEROBOTPROGRAMMINGROBOTMOVEMENTSARESPECIFIEDASSKILLPRIMITIVES,BASEDONWHICHTHEASSEMBLYTASKISMANUALLYCODEDINTOPROGRAMSWITHTHEPROGRAMS,THEROBOTISCONTROLLEDTOFULFILLASSEMBLYTASKSAUTOMATICALLYASKILLBASEDMICROMANIPULATIONSYSTEMHASBEENDEVELOPEDINTHEAUTHORS’LAB,ANDITCANREALIZEMANYMICROMANIPULATIONOPERATIONSINTHESYSTEM,THEASSEMBLYTASKISMANUALLYDISCOMPOSEDINTOSKILLSEQUENCESANDCOMPILEDINTOAFILEAFTERIMPORTINGTHEFILEINTOTHESYSTEM,THESYSTEMCANAUTOMATICALLYEXECUTETHEASSEMBLYTASK7THISPAPERATTEMPTSTOEXPLOREAUSERFRIENDLY,ANDATTHESAMETIMEEASY,SEQUENCEGENERATIONMETHOD,TORELIEVETHEBURDENOFMANUALLYPROGRAMMINGTHESKILLSEQUENCEITISANEFFECTIVEMETHODTODETERMINETHEASSEMBLYSEQUENCEFROMGEOMETRICCOMPUTERAIDEDDESIGNCADMODELSMANYAPPROACHESHAVEBEENPROPOSEDEG,8–11THISPAPERAPPLIESASIMPLEAPPROACHTOGENERATETHEASSEMBLYSEQUENCEITISNOTINVOLVEDWITHTHELOWLEVELDATASTRUCTUREOFTHECADMODEL,ANDCANBEREALIZEDWITHTHEAPPLICATIONPROGRAMMINGINTERFACEAPIFUNCTIONSTHATMANYCOMMERCIALCADSOFTWAREPACKAGESPROVIDEINTHEPROPOSEDAPPROACH,ARELATIONSGRAPHAMONGDIFFERENTCOMPONENTSISFIRSTCONSTRUCTEDBYANALYZINGTHEASSEMBLYMODEL,ANDTHEN,POSSIBLESEQUENCESARESEARCHED,BASEDONZLIUPTCJAPANCOMPANY,OJI525617,KITAKU,TOKYO,1140002,JAPANEMAILLIUZHIQIECOMPMETROUACJPTEL8142677114246FAX814267727TNAKAMURADEPARTMENTOFPRECISIONENGINEERING,TOKYOMETROPOLITANUNIVERSITY,KITAKU,JAPANCONSTRAINT,THEREMAININGDEGREESOFFREEDOMARER1{X,Y,ROTZ}FORTHECOLLINEARCONSTRAINT,THEREMAININGDEGREESOFFREEDOMARER2{Z,ROTZ}R1ANDR2CANALSOBEREPRESENTEDASR1{1,1,0,0,0,1}ANDR2{0,0,1,0,0,1}HERE,1MEANSTHATTHEREISADEGREEOFSEPARATIONBETWEENTHETWOPARTSR1∩R2{0,0,0,0,0,1},ANDSO,THEDEGREEOFFREEDOMAROUNDTHEZAXISWILLBEIGNOREDINTHEFOLLOWINGSTEPSINTHECASETHATTHEREISALOOPINTHERELATIONGRAPH,SUCHASPARTSPART5,PART6,ANDPART7INFIG2,THELOOPHASTOBEBROKENBEFORETHEMATINGDIRECTIONISCALCULATEDUNDERTHEASSUMPTIONTHATALLPARTSINTHECADMODELAREFULLYCONSTRAINEDANDNOTOVERCONSTRAINED,THEFOLLOWINGSIMPLEAPPROACHISADOPTEDFORTHEPARTTINTHELOOP,CALCULATETHENUMBEROF1SINNTI?RI1\RI2\\RINWHERERIKISTHEREMAININGDEGREESOFFREEDOMOFCONSTRAINTKBYPARTIFOREXAMPLE,INFIG2,GIVENTHATTHENUMBEROF1SINUPART5,PART7ANDUPART6,PART7ISLARGERTHANUPART5,PART6ANDUPART6,PART5,RESPECTIVELY,THENITCANBEREGARDEDTHATTHEPOSITIONOFPART7ISDETERMINEDBYCONSTRAINTSWITHBOTHPART5ANDPART6,WHILEPART5ANDPART6CANBEFULLYCONSTRAINEDBYCONSTRAINTSBETWEENPART5ANDPART6WECANUNITEPART5ANDPART6ASONENODEINTHERELATIONGRAPH,ALSOCALLEDACOMPOSITENODE,ASSHOWNINFIG2BTHECOMPOSITENODEWILLBEREGARDEDASASINGLEPART,BUTITISOBVIOUSTHATTHECOMPOSITENODEIMPLIESANASSEMBLYSEQUENCE2CALCULATEMATINGDIRECTIONSFORALLNODESINTHERELATIONGRAPHAGAIN,FORTHEEXAMPLEINFIG3,BEGINNINGATTHESTATETHATTHESHAFTANDTHEHOLEAREASSEMBLED,SEPARATETHEPARTINONEDEGREEOFSEPARATIONBYACERTAINDISTANCELARGERTHANTHEMAXIMUMTOLERANCE,ANDTHENCHECKIFINTERFERENCEOCCURSSEPARATIONINBOTH±XAXISAND±YAXISOFR1CAUSESTHEINTERFERENCEBETWEENTHESHAFTANDTHEHOLESEPARATIONINTHEZDIRECTIONRAISESNOINTERFERENCETHEN,SELECTTHEZDIRECTIONASTHEMATINGDIRECTION,WHICHISREPRESENT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簡介:4900英文單詞,英文單詞,28500英文字符,中文英文字符,中文9200字文獻(xiàn)出處文獻(xiàn)出處MANEESHAGRAWALA,WILMOTLI,FLORAINEBERTHOUZOZDESIGNPRINCIPLESFORVISUALCOMMUNICATIONJCOMMUNICATIONSOFTHEACM,2011,5446069DESIGNPRINCIPLESFORVISUALCOMMUNICATIONMANEESHAGRAWALA,WILMOTLI,ANDFLORAINEBERTHOUZOZVISUALCOMMUNICATIONVIADIAGRAMS,SKETCHES,CHARTS,PHOTOGRAPHS,VIDEO,ANDANIMATIONISFUNDAMENTALTOTHEPROCESSOFEXPLORINGCONCEPTSANDDISSEMINATINGINFORMATIONTHEMOSTEFFECTIVEVISUALIZATIONSCAPITALIZEONTHEHUMANFACILITYFORPROCESSINGVISUALINFORMATION,THEREBYIMPROVINGCOMPREHENSION,MEMORY,ANDINFERENCESUCHVISUALIZATIONSHELPANALYSTSQUICKLYFINDPATTERNSLURKINGWITHINLARGEDATASETSANDHELPAUDIENCESQUICKLYUNDERSTANDCOMPLEXIDEASOVERTHEPASTTWODECADESANUMBEROFBOOKSHAVECOLLECTEDEXAMPLESOFEFFECTIVEVISUALDISPLAYSONETHINGISEVIDENTFROMINSPECTINGTHEMTHEBESTARECAREFULLYCRAFTEDBYSKILLEDHUMANDESIGNERSYETEVENWITHTHEAIDOFCOMPUTERS,HANDDESIGNINGEFFECTIVEVISUALIZATIONSISTIMECONSUMINGANDREQUIRESCONSIDERABLEEFFORTMOREOVER,THERATEATWHICHPEOPLEWORLDWIDEGENERATENEWDATAISGROWINGEXPONENTIALLYYEARTOYEARGANTZETALESTIMATEDWECOLLECTIVELYPRODUCED161EXABYTESOFNEWINFORMATIONIN2006,ANDTHECOMPOUNDGROWTHRATEBETWEEN2007AND2011WOULDBE60ANNUALLYWEARETHUSEXPECTEDTOPRODUCE1,800EXABYTESOFINFORMATIONIN2011,10TIMESMORETHANTHEAMOUNTWEPRODUCEDIN2006YETACQUIRINGANDSTORINGTHISDATAIS,BYITSELF,OFLITTLEVALUEWEMUSTUNDERSTANDITTOPRODUCEREALVALUEANDUSEITTOMAKEDECISIONSTHEPROBLEMISTHATHUMANDESIGNERSLACKTHETIMETOHANDDESIGNEFFECTIVEVISUALIZATIONSFORTHISWEALTHOFDATATOOOFTEN,DATAISEITHERPOORLYVISUALIZEDORNOTVISUALIZEDATALLEITHERWAY,THERESULTSCANBECATASTROPHICFOREXAMPLE,TUFTEEXPLAINEDHOWMORTONTHIOKOLENGINEERSFAILEDTOVISUALLYCOMMUNICATETHERISKSOFLAUNCHINGTHECHALLENGERSPACESHUTTLETONASAMANAGEMENTIN1986,LEADINGTOTHEVEHICLE’SDISASTEROUSFAILUREWHILEROBISONETAL20ARGUEDTHEENGINEERSMUSTNOTBEBLAMEDFORTHECHALLENGERACCIDENT,BETTERCOMMUNICATIONOFTHERISKSMIGHTHAVEPREVENTEDTHEDISASTERSKILLEDVISUALDESIGNERSMANIPULATETHEPERCEPTION,COGNITION,ANDCOMMUNICATIVEINTENTOFVISUALIZATIONSBYCAREFULLYAPPLYINGPRINCIPLESOFGOODDESIGNTHESEPRINCIPLESEXPLAINHOWVISUALTECHNIQUESCANBEUSEDTOEITHEREMPHASIZEIMPORTANTINFORMATIONORDEEMPHASIZEIRRELEVANTDETAILSFOREXAMPLE,THEMOSTIMPORTANTINFORMATIONINASUBWAYMAPISTHESEQUENCEOFSTOPSALONGEACHLINEANDTHETRANSFERSTOPSTHATALLOWRIDERSTOCHANGELINESMOSTSUBWAYPASSENGERSDONOTNEEDTOKNOWTHETRUEGEOGRAPHICPATHOFEACHLINEBASEDONTHISINSIGHT,MAPDESIGNERHARRYBECKREDESIGNEDTHEMAPOFTHELONDONUNDERGROUNDIN1933USINGTWOMAINPRINCIPLESSTRAIGHTENINGTHESUBWAYLINESANDEVENLYSPACINGTHESTOPSTOVISUALLYEMPHASIZETHESEQUENCEOFSTOPSANDTRANSFERPOINTSSEEFIGURE1SUCHDESIGNPRINCIPLESCONNECTTHEVISUALDESIGNOFAVISUALIZATIONWITHTHEVIEWER’SPERCEPTIONANDCOGNITIONOFTHEUNDERLYINGINFORMATIONTHEVISUALIZATIONISMEANTTOCONVEYINTHEFIELDOFDESIGN,THEREISALONGSTANDINGDEBATEREGARDINGTHEINTERACTIONOFAESTHETICANDFUNCTIONALPROPERTIESOFDESIGNEDARTIFACTSWEDONOTSEEKTOENGAGEINTHISDEBATEHERERATHER,WEFOCUSONHOWPARTICULARDESIGNCHOICESAFFECTTHEPERCEPTIONANDCOGNITIONOFTHEVISUALIZATION,NOTTHEAESTHETICSTYLEOFTHEVISUALIZATIONACCORDINGLY,WEUSETHETERM“DESIGNPRINCIPLE”ASASHORTHANDFORGUIDELINESTHATHELPIMPROVEVIEWERS’COMPREHENSIONOFVISUALLYENCODEDINFORMATIONEMPHASIZETHESHAPEOFTHEMISSINGGEOMETRYANDSPATIALRELATIONSHIPSAMONGPARTSOURSYSTEMINCORPORATESSUCHPRINCIPLESTOGENERATEINTERACTIVECUTAWAYANDEXPLODEDVIEWILLUSTRATIONSMIDDLE,RIGHTSTAGE1IDENTIFYDESIGNPRINCIPLESWEIDENTIFYDOMAINSPECIFICDESIGNPRINCIPLESBYANALYZINGTHEBESTHANDDESIGNEDVISUALIZATIONSWITHINAPARTICULARINFORMATIONDOMAINWECONNECTTHISANALYSISWITHRESEARCHONPERCEPTIONANDCOGNITIONOFVISUALIZATIONSSTAGE2INSTANTIATEDESIGNPRINCIPLESWEENCODETHEDESIGNPRINCIPLESINTOALGORITHMSANDINTERFACESFORCREATINGVISUALIZATIONSANDSTAGE3EVALUATEDESIGNPRINCIPLESWEMEASUREIMPROVEMENTSININFORMATIONPROCESSING,COMMUNICATION,ANDDECISIONMAKINGTHATRESULTFROMOURVISUALIZATIONSTHESEEVALUATIONSALSOSERVETOVALIDATETHEDESIGNPRINCIPLESWEHAVEUSEDTHISTHREESTAGEAPPROACHTOBUILDAUTOMATEDVISUALIZATIONDESIGNSYSTEMSINTWODOMAINSCARTOGRAPHICVISUALIZATIONANDTECHNICALILLUSTRATIONINTHEDOMAINOFCARTOGRAPHICVISUALIZATIONSWEHAVEDEVELOPEDAUTOMATEDALGORITHMSFORCREATINGROUTEMAPSANDTOURISTMAPSOFCITIES8INTHEDOMAINOFTECHNICALILLUSTRATIONWEHAVEDEVELOPEDAUTOMATEDTECHNIQUESFORGENERATINGASSEMBLYINSTRUCTIONSOFFURNITUREANDTOYSANDFORCREATINGINTERACTIVECUTAWAYANDEXPLODEDVIEWILLUSTRATIONSOFCOMPLEXMECHANICAL,MATHEMATICAL,ANDBIOLOGICALOBJECTSHERE,WEFOCUSONARTICULATINGTHETECHNIQUESWEHAVEUSEDTOIDENTIFYANDEVALUATETHEDESIGNPRINCIPLESFOREACHDOMAINTHESETECHNIQUESGENERALIZETOOTHERDOMAINS,ANDAPPLYINGOURTHREESTAGEAPPROACHWILLRESULTINABETTERUNDERSTANDINGOFTHESTRATEGIESPEOPLEUSETOMAKEINFERENCESFROMVISUALIZATIONSFIGURE3EXPLODEDVIEWSOFCOMPLEXMATHEMATICALSURFACESAREDESIGNEDTOREVEALLOCALGEOMETRICFEATURESSUCHASSYMMETRIES,SELFINTERSECTIONS,ANDCRITICALPOINTSSTAGE1IDENTIFYDESIGNPRINCIPLESDESIGNPRINCIPLESAREPRESCRIPTIVERULESDESCRIBINGHOWVISUALTECHNIQUESAFFECTTHEPERCEPTIONANDCOGNITIONOFTHEINFORMATIONINADISPLAYINSOMECASES,THEYAREEXPLICITLYOUTLINEDINBOOKSFOREXAMPLE,BOOKSONPHOTOGRAPHYTECHNIQUESEXPLAINTHERULESFORCOMPOSING
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簡介:2200英文單詞,英文單詞,12500英文字符,中文英文字符,中文3600字文獻(xiàn)出處文獻(xiàn)出處AGUILARJA,GARRIGóSI,MAZóNJN,ETALWEBENGINEERINGAPPROACHESFORREQUIREMENTANALYSISASYSTEMATICLITERATUREREVIEWJINVESTIGACIóN,2010187190WEBENGINEERINGAPPROACHESFORREQUIREMENTANALYSISASYSTEMATICLITERATUREREVIEWJOSEALFONSOAGUILAR,IRENEGARRIGóS,JOSENORBERTOMAZóNANDJUANTRUJILLOABSTRACTWEBENGINEERINGSOFTWAREDEVELOPMENTISFACINGCONTINUOUSCHANGESINTECHNOLOGYIMPLEMENTATIONTHISINVOLVESANALYSTS,DEVELOPERSANDDESIGNERSTOPROVIDEEXTRAEFFORTINTHEDESIGNANDMAINTENANCEOFWEBAPPLICATIONSINORDERTOADAPTTHEMTOCHANGESINREQUIREMENTSANDIMPLEMENTATIONTECHNOLOGIESINTHISPAPER,ASYSTEMATICREVIEWISPRESENTEDINORDERTOOBTAIN,INAFORMALWAY,THECURRENTSTATEOFTHEARTABOUTAPPROACHESFORMODELING,ANALYSISANDSPECIFICATIONOFWEBENGINEERINGREQUIREMENTS,SUPPORTEDWITHAFORMALANDWELLDEFINEDSTRATEGYKEYWORDSREQUIREMENTANALYSIS,WEBENGINEERING,SYSTEMATICREVIEW1INTRODUCTIONONEOFTHEMOSTIMPORTANTFACTORSOFSUCCESSINTHESOFTWAREDEVELOPMENTISTHEELICITATION,MANAGEMENT,ANDANALYSISOFREQUIREMENTSTHISISESPECIALLYTRUEINWEBENGINEERINGDUETOTHEHETEROGENEOUSAUDIENCEOFTHEWEB,WHICHMAYLEADTOWEBSITESDIFFICULTTOCOMPREHENDBYVISITORSANDCOMPLEXTOMAINTAINBYDESIGNERSGARRIGóS,MAZóNETAL2009IMPORTANTLY,WEBAPPLICATIONSHAVECERTAINCHARACTERISTICSTHATMAKETHEMDIFFERENTFROMTRADITIONALSOFTWAREORINFORMATIONSYSTEMSSUCHASTHEAMOUNTOFINFORMATIONTHEYOFFERCONTENT,THEACCESSTOTHEDIFFERENTSCENARIOSWHERETHEYOFFERTHISINFORMATIONNAVIGATIONALANDHOWPROVIDINGTHISINFORMATIONTOTHEUSERORTHEGROUPSOFUSERSFUNCTIONALITYOFTHEWEBSITETHESEUNIQUECHARACTERISTICSOFWEBAPPLICATIONSENFORCEDNEWWEBENGINEERINGMETHODOLOGIESTOCOPEWITHTHOSENEWREQUIREMENTSANDWEBDEVELOPERSNEEDTOADOPTITTHEGOALOFTHISWORKISTOMAKEACOMPREHENSIVEREVIEWANDSYNTHESISOFTHECURRENTSTATEOFTHEARTINTHELITERATURERELATEDTOTHESPECIFICATIONOFWEBENGINEERINGREQUIREMENTSWITHTHEPURPOSEOFSHOWINGGAPSINCURRENTRESEARCHANDSHEDLIGHTONPOTENTIALFUTURERESEARCHLINESINTHISPAPER,WEEXPECTTOSTUDYMETHODSANDTECHNIQUESTHATPROPOSETHESPECIFICATIONOFWEBREQUIREMENTSANDBRINGSOMEKINDOFSUPPORTTOGENERATESEVERALMODELSOFTHEWEBSITEFROMTHEREQUIREMENTSTHEMAINOBJECTIVEOFTHISWORKHASBEENACHIEVEDTHROUGHASYSTEMATICREVIEWUSINGTHEAPPROACHOFKITCHENHAMKITCHENHAM2004ANDTAKINGINTOACCOUNTMARKSTAPLESEXPERIENCESSTAPLESANDNIAZI20072BACKGROUNDWEBENGINEERINGWEISABRANCHOFSOFTWAREENGINEERINGSETHATDEFINESTECHNIQUES,PROCESSESANDSPECIFICMODELSFORTHEWEBENVIRONMENTWEHASASUBDISCIPLINETHATREFERSTOTHEPHASEINAPPLICATIONDEVELOPMENTINWHICHREQUIREMENTSOFDIFFERENTSTAKEHOLDERSAREGATHEREDANDPROCESSED,RESULTINGINAREQUIREMENTSSPECIFICATION,THISPHASEISCALLEDREQUIREMENTSENGINEERINGREALMEIDA,VANECKETAL2006INTHISSENSE,ONEPROBLEMASSOCIATEDWITHREISTHATREQUIREMENTSSHOULDBEFULLYCOMPLETEDTOTHISAIM,ITISNECESSARYTHATUSERSANDSTAKEHOLDERSCANSEETHATITHASCOMPLETEDTHETRANSFORMATIONOFTHEIRREQUIREMENTSINTHEFINALWORKPRODUCTANDBEABLETOMODELSNAVIGATIONALDEVELOPMENTTECHNIQUESNDTINREQUIREMENTSANALYSISPHASENDTAPPLIESUSECASEDIAGRAMSANDASETOFTEMPLATESFORREQUIREMENTSWITHATEXTUALDESCRIPTIONESCALONAANDARAGON2008TRACEABILITYISSUPPORTEDTHROUGHASETOFTRACEABILITYMATRICESTHATKEEPSTHERELATIONSHIPBETWEENAREQUIREMENTANDTHEIRRESPECTIVEARTIFACTTHATSATISFIESITESCALONA,MEJíASETAL2004REQUIREMENTSANALYSISPHASEANDTRACEABILITYISSUPPORTEDBYTHENDTSUITETOOLNDTPROFILE,NDTDRIVERQUALITYNDTUSINGPROFILESTOWORKWITHTHECASETOOLENTERPRISEARCHITECTINESCALONAANDKOCH2007,THEAUTHORSOFNDTANDUWEHAVEDEVELOPEDANUMLPROFILEFORWEBREQUIREMENTSCALLEDWEBREINCOMBINATIONOFBOTHAPPROACHES,THECONCEPTUALMODELSCANBEDERIVEDFROMREQUIREMENTSSPECIFICATIONTHEMAINDRAWBACKOFTHISAPPROACHISTHELACKOFTOOLSUPPORTFORMODELTOMODELTRANSFORMATIONSWEBMODELINGLANGUAGEWEBMLTHISISAMETHODFORDESIGNINGWEBSITESTHATALLOWHIGHLEVELMODELINGCERI,FRATERNALIETAL2000THEREQUIREMENTSANALYSISPHASEISNOTDESCRIBEDINDETAIL,BUTINWEBML2009THEAUTHORPROPOSESTHEUSEOFUMLUNIFIEDMODELINGLANGUAGEUSINGUSECASEANDACTIVITYDIAGRAMSFORITSSPECIFICATIONTHISAPPROACHDOESNOTHAVETRACEABILITYSUPPORTWSDMWEBSITEDESIGNMETHODTHEINITIALTWOPHASESOFTHISAPPROACHMISSIONSTATEMENTANDUSERMODELINGARERESPONSIBLEFORMANAGINGREQUIREMENTSTHROUGHTECHNIQUESSUCHASCONCEPTMAPSOFROLESANDACTIVITIESANDTHEDATADICTIONARYFORTHEDEFINITIONOFFUNCTIONALANDSECURITYREQUIREMENTSDETROYERANDLEUNE1998THEREQUIREMENTSINTHISAPPROACHARESPECIFIEDINATEXTUALFORMTHELACKOFTRANSFORMATIONSBETWEENMODELSANDSUPPORTFORTRACEABILITYASWELLASTHELACKOFAPROTOTYPETOOLWHICHSUPPORTSTHEREQUIREMENTSSPECIFICATIONDEMONSTRATESTHELIMITATIONSOFTHISAPPROACHOOWSANOBJECTORIENTEDAPPROACHFORWEBSOLUTIONSMODELINGTHISAPPROACHPROVIDESAGATHERINGREQUIREMENTSPHASETHROUGHASERIESOFSTRATEGIESTHATIMPLEMENTFRTFUNCTIONREFINEMENTTREE,USECASESANDASETOFDIAGRAMSTASKS,TASKSPECIFICATIONANDDATADESCRIPTIONFORNAVIGATIONREQUIREMENTSTHISAPPROACHHASTRACEABILITYSUPPORTVALDERASANDPELECHANO2009,THISISDONETHROUGHASETOFTRANSFORMATIONSRULESDEFINEDBYGRAPHTHEORYINREGARDTOTOOLSUPPORT,THISAPPROACHHASANENVIRONMENTCALLEDOOWSSUITEVALVERDE,VALDERASETAL2007,WHICHISINTEGRATEDWITHTHEOLIVANOVATOOLTOPROVIDESUPPORTFORREQUIREMENTSGATHERINGPHASEFORTHETRACEABILITYTOOLSUPPORT,THISAPPROACHUSESTWOTOOLS,THEFIRSTONEISTHEOPENSOURCETOOLCALLEDAGGATTRIBUTED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大?。?0.11(MB)
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簡介:ELECTRICMEASUREMENTSWITHLABVIEWVALENTINDOGARUULIERUFACULTYOFELECTRICALENGINEERING,UNIVERSITYVALAHIAOFTARGOVISTE1820BLVUNIRII,TARGOVISTE,DAMBOVITAROMANIAABSTRACTTHEPAPERPRESENTSADATAACQUISITIONSYSTEMWHICHCONSISTSINHALLEFFECTSENSORS,APCI6023NATIONALINSTRUMENTSDATAACQUISITIONBOARD,LABVIEWGRAPHICALPROGRAMMINGENVIRONMENTANDTHEEXPERIMENTALRESULTSACHIEVEDBYTHEAUTHORSCONCERNINGTHEBEHAVIOROFACELECTRICALCIRCUITSTHEINSTRUMENTSUSEDINTHEMEASUREMENTTECHNIQUEWEREDEVELOPEDASCOMPUTERDATABASEEQUIPMENTS,USINGWELLDETERMINEDFUNCTIONSTHEACQUISITIONOFPARAMETERS,SIGNALPROCESSING/ADAPTINGWITHTHECOMMUNICATIONPOSSIBILITYONASERIALINTERFACEORONAPARALLELPORTTODAY,DATAACQUISITIONBOARDSAREUSEDANDCANBEASSEMBLEDDIRECTLYINTOTHECOMPUTER,HAVINGTHEOPERATIONPOSSIBILITYOFANOSCILLOSCOPETHEAPPEARANCEOFTHELABVIEWENVIRONMENTWASMOTIVATEDBYTHERESEARCHAUTOMATIONACTIVITYANDBYTHEAPPLICATIONDEVELOPMENT,BASEDONAHIERARCHICALINSTRUMENTSTRUCTURE,WHICHISCOMPOSEDBYTHEUSERSINTERFACEANDTHEVISUALPROGRAMMINGELEMENTSKEYWORDSDATAACQUISITION,GRAPHICALPROGRAMMING,HALLEFFECT,ELECTRICPOWER1INTRODUCTIONTHEUSEOFTHELABVIEWGRAPHICALPROGRAMMINGENVIRONMENTENSURESTHEANALYSISANDSTUDYOFPOWERMEASUREMENTMETHODSINSINGLEPHASEANDTHREEPHASEALTERNATIVECURRENTCIRCUITS3,6,7THEEVOLUTIONINBOTHELECTRICMEASUREMENTTECHNIQUE,INTHEELECTRONICFIELDANDINTHEAREAOFDATAACQUISITIONSYSTEMS,ARGUMENTSTHEOPPORTUNITYANDJUSTIFICATIONOFDESIGNINGNEWINSTRUMENTSINORDERTOIMPROVETHERESEARCHACTIVITYINTHISAREA2,32POWERMEASUREMENTINSINGLEPHASEACCIRCUITS21POWERSINACCIRCUITSTHEINSTANTANEOUSPOWER1,2,3,4TOANELECTRICDIPOLEISDEFINEDASTHEPRODUCTOFTHEINSTANTANEOUSVALUESOFTHEVOLTAGEUTOTHETERMINALOFTHEDIPOLEANDTHECURRENTITHATFLOWSTHROUGHTHEDIPOLEPUI1THEINSTANTANEOUSPOWERCANBECLASSIFIEDINTOINPUTANDOUTPUTPOWER,DEPENDINGONTHEASSOCIATIONOFTHEVOLTAGEUANDTHECURRENTI,WHICHRESPECTSTHERULEOFRECEIVERSANDGENERATORSINASINEWAVESTEADYSTATEWITHTHETPERIOD,THEACTIVEPOWERPCANBEDEFINEDASTHEAVERAGEVALUEOFTHEINSTANTANEOUSPOWER,CONSIDERINGANATURALNUMBEROFPERIODSPUINTPDTTTNT∫1112FORASINGLEPHASECIRCUITWHICHFUNCTIONSUNDERASINEWAVEPERMANENTRATE,INWHICHTHEVOLTAGEANDCURRENTHAVETHEFOLLOWINGEXPRESSIONSUTUT2SINΩ3ITIT2SINΩΦ?4ITRESULTSTHEACTIVEPOWERPUICOSΦTHEREACTIVEPOWERQUISINΦ5THEAPPARENTPOWERSUITHECOMPLEXAPPARENTPOWERSISDEFINEDINTOTHESIMPLIFIEDCOMPLEXREPRESENTATIONASTHEPRODUCTBETWEENTHECOMPLEXVOLTAGEUANDTHECONJUGATECOMPLEXCURRENTIJQPJUIUIUIS?ΦΦSINCOS6THEREALPARTOFTHECOMPLEXPOWERSISTHEACTIVEPOWERP,THEIMAGINARYPARTISTHEREACTIVEPOWERQ,THEMODULEISTHEAPPARENTPOWERSANDTHEARGUMENTISEQUALTOTHEPHASEDISPLACEMENTΦOFTHECIRCUIT{}SPRE{}SQIMSS7FORASINGLEPHASECIRCUITWHICHDOESNOTFUNCTIONINSINEWAVERATE4ANDHASTHETERMINALVOLTAGEUTPROCOFTHE8THWSEASINTCONFONMATHEMATICALMETHODSANDCOMPUTATIONALTECHNIQUESINELECTRICALENGINEERING,BUCHAREST,OCTOBER1617,2006197GALVANICISOLATIONOFTHEMEASURINGSYSTEM,BUTITINTRODUCESRATIOANDANGLEERRORSANDREALIZESANINADEQUATEPERTURBATIONTRANSFERTHEADOPTEDSOLUTIONWASTOUSECURRENTANDVOLTAGETRANSDUCERSBASEDONTHEHALLEFFECTTHEBLOCKDIAGRAMOFTHEACQUISITIONSYSTEMISPRESENTEDINFIG2ANDFIG3PRESENTSTHEEXPERIMENTALRESULTSREMARKTHEVOLTAGEVALUESANDTHEPARAMETERSOFTHECONSUMERSINFIG3A,WEREINTRODUCEDINTOTHEAPPLICATIONREALIZEDFORSIMULATIONFIG13POWERMEASUREMENTINTHREEPHASEACCIRCUITSFORARANDOMRECEIVERZ,CONSISTINGINLINEARIMPEDANCES,FORMINGASYSTEMWITHNNODESWHICHISALIMENTEDTHROUGHACIRCUITWITHNCONDUCTORS1,THETOTALCOMPLEXAPPARENTPOWERSTRANSMITTEDTOTHERECEIVERISSVIVIVIVIKKNN112213BYEXPRESSINGTHEPOTENTIALSOFTHENODESUSINGTHEPOTENTIALDIFFERENCESREPORTEDTOAPOINTNHAVINGARANDOMPOTENTIAL,THEEXPRESSION31BECOMESSUIUIUIUINNKNKNN1122N14THEDEFINITIONSOFACTIVEANDREACTIVEPOWERGIVETHEFOLLOWINGRESULTS∑NKKNKNNNNNNNNNNNNNNNPPPPPPIUIUIUIUIUIUIUIUIUSP121222211112211,COS,COS,COS}RE{}RE{15,SINSIN,SIN}IM{}IM{222211112211NNNNNNNNNNNNNNNIUIUIUIUIUIUIUIUIUSQ????∑NKKNKQQQQQQ12116THETOTALACTIVEPOWERPRESPECTIVELYTHEREACTIVEPOWER–QCONSUMEDBYARANDOMRECEIVERWITHNPHASESANDALIMENTEDTHROUGHALINEOFNCONDUCTORS,ISEQUALTOTHESUMOFNACTIVESINGLEPHASEPOWERSORREACTIVESINGLEPHASEPOWERSWHICHAREGIVENBYTHEIKLINECURRENTS,WITHTHEUKNVOLTAGESBETWEENTHENCONDUCTORSANDTHENPOINTTHEALTERNATIVETHREEPHASECIRCUITSHAVETHEFOLLOWINGVOLTAGESYSTEM32SIN232SIN2SIN2321ΠΩΠΩΩ?TUUTUUTUU17IFTHEVOLTAGESYSTEMSUPPLIESATHREEPHASEBALANCEDRECEIVER,THECURRENTSYSTEMWILLBE32SIN232SIN2SIN2321ΦΠΩΦΠΩΦΩ????TIITIITII18IFTHEPHASEIMPEDANCESAREDIFFERENT,THERECEIVERISNOTBALANCEDANDTHEABSORBEDCURRENTSFROMTHESOURCECANBECALCULATEDWITHMETHODSTHATARERELATEDTOSTARCONNECTEDTHREEPHASEBALANCEDRECEIVERS,ITRESULTS0321IIII19REGARDINGTHEIMPEDANCEVALUEOFTHENEUTRALCONDUCTORZ0,THEVOLTAGEVALUEWILLBE000IZU?20THEBLOCKDIAGRAMOFTHEDATAACQUISITIONSYSTEMISPRESENTEDINFIG4THEMEASURINGMETHODSFORACTIVE/REACTIVEPOWERINTHREEPHASEACCIRCUITS,DEPENDONTHETYPEOFTHECONSUMERANDTHENUMBEROFCONDUCTORSINTHEELECTRICENERGYSUPPLYSYSTEMI1/I2/I3–LA55PIN–LA25NPU10/U20/U30–LV25PFIG4DATAACQUISITIONSYSTEM–BLOCKDIAGRAMFORTHREEPHASECIRCUITSWITHNEUTRALCONDUCTORN4,THEGENERALIZEDTHEOREMBECOMES{}PSUIKNKK???????????∑RERE1421PROCOFTHE8THWSEASINTCONFONMATHEMATICALMETHODSANDCOMPUTATIONALTECHNIQUESINELECTRICALENGINEERING,BUCHAREST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上傳時(shí)間:2024-03-13
頁數(shù): 4
大?。?0.15(MB)
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簡介:3000英文單詞,英文單詞,16萬英文字符,中文萬英文字符,中文5050字文獻(xiàn)出處文獻(xiàn)出處ZIVKOVICDS,MARKOVICBR,RAKICD,ETALDESIGNCONSIDERATIONSANDPERFORMANCEOFLOWCOSTULTRASONICRANGINGSYSTEMC//POSITIONINGNAVIGATIONCOMMUNICATIONIEEE,2013DESIGNCONSIDERATIONSANDPERFORMANCEOFLOWCOSTULTRASONICRANGINGSYSTEMDRAGANSZIVKOVIC,BOGDANRMARKOVIC,DEJANRAKIC,SRDJANTADICABSTRACTNUMEROUSSYSTEMSFORRELIABLE,LOWCOST,INDOOR,ULTRASONICSENSINGHAVEBEENDEMONSTRATEDDURINGTHEPASTFEWDECADESEXISTINGSOLUTIONSSPANVERYLOWCOSTTRANSDUCERSTOHIGHGRADEEQUIPMENTTHISPAPERPRESENTSDESIGNDETAILSOFALOWCOST,SINGLETONE,RANGINGSYSTEMASETOFEXPERIMENTALRESULTSISINCLUDEDINORDERTOEVALUATECONSISTENCYBETWEENRANGINGRESULTSOBTAINEDFROMRECEIVERSWITHVARIOUSARCHITECTURESTHEEFFECTSOFCHANNELEQUALIZATIONANDSIGNALPRECODINGEVALUATEDSHOWHOWTHESESYSTEMSCANDEALWITHREALISTICREFLECTORSINDEXTERMSULTRASONICTRANSDUCERS,CRAMERRAOBOUNDS,TIMEOFARRIVALESTIMATION,INDOORENVIRONMENTS,CFAR,TOMLINSONHARASHIMAPRECODERIINTRODUCTIONRANGINGISANESSENTIALELEMENTINMANYROBOTICS,INDUSTRIAL,ANDAMBIENTINTELLIGENCEAPPLICATIONSULTRASONICSENSINGISAPOTENTIALSOLUTIONFORRELIABLEANDLOWCOSTINDOORLOCALIZATIONANDRANGINGINTHEEXPERIMENTSDESCRIBEDWITHINTHISPAPER,ULTRASONICTRANSDUCERS,ACTINGASBOTHEMITTERSANDRECEIVERS,WEREUSEDTOLOCATEREFLECTORSBASEDONTHETIMEOFFLIGHTTOFOFSOUNDWAVESTHEPERFORMANCEOFULTRASONICDISTANCEMEASUREMENTDEPENDSONEMPLOYEDSIGNALBANDWIDTH,WHICHDIRECTLYLIMITSTHEAMOUNTOFAVAILABLEINFORMATIONTHEPRESENTEDSYSTEMUSESLOWCOST,NARROWBAND,PIEZOELECTRICTRANSDUCERSPZTAFOCUSOFTHEWORKWASTOCONSIDERRANGINGCONSISTENCYANDINVESTIGATETHEBENEFITOFBANDWIDTHEXTENSIONBYCHANNELEQUALIZATIONANDACONSTANTFALSEALARMRATECFAR1BASEDDETECTIONOFQUALITYOFRANGINGMEASUREMENTSTHESYSTEMSUGGESTEDPRESENTSCORETECHNOLOGYFORMORECOMPLEX,SENSORARRAYBASEDLOCALIZATIONORBEARINGESTIMATION23SUCHSYSTEMSORDINARILYUSEDIRECTSEQUENCECODEDIVISIONMULTIPLEACCESSDSCDMATOMANAGETHEMULTIPLEACCESSOFANUMBEROFTRANSDUCERSTHISWASSTIMULUSTOADDITIONALLYEXPLORETHEIMPACTOFPSEUDORANDOMNOISEPNSIGNALINGTOTHESYSTEM4AORGANIZATIONTHEPAPERSORGANIZATIONISASFOLLOWSSECTIONIIBRIEFLYINTRODUCESTHEULTRASONICSENSINGPROBLEMANDRELATEDPRIORWORKSECTIONIIIPRESENTSDESIGNDETAILSOFTHEDEVELOPEDSYSTEMEXPERIMENTALRESULTSAREDESCRIBEDINSECTIONIVSECTIONVGIVESANOVERVIEWOFPROCESSINGHARDWAREANDRELATEDPRACTICALCONSIDERATIONSTHECONCLUSIONSAREGIVENINSECTIONVIIIULTRASONICSENSINGANDRELATEDWORKTHEULTRASONICSENSORWILLMEASUREDISTANCEBYEMITTINGASOUNDWAVEANDTHEN“LISTENING“FORASETPERIODOFTIME,ALLOWINGFORTHERETURNOFECHOESBOUNCINGOFFTHETARGET,BEFORERETRANSMITTINGDUETOTHEPHENOMENONCALLEDRINGING–ACONTINUEDVIBRATIONOFTHETRANSDUCERAFTERITSEXCITATIONPULSE–THESENSORCANNOTRELIABLYMEASUREWITHINASOCALLED“DEADZONE”INITSPROXIMITYTHEACCURACYOFMEASUREMENTDEPENDSONTHEACCURACYOFTHESPEEDOFSOUNDUSEDINCALCULATIONTHESPEEDOFSOUNDCCANBEDERIVEDASSIGNALBANDWIDTH”THETRANSMITTEDSIGNALISASHORTKASAMICODEMODULATEDBYTHECARRIERAT40KHZTHETRANSDUCERS’6DBBEAMANGLEIS80DEGREESFIG1THERECEIVERSAMPLINGRATEWAS100KHZ8000SAMPLES80MSWEREUSEDINORDERTOANALYZEECHOANDDETECTSURROUNDINGOBSTACLESDISTANCEISESTIMATEDBYTHEROUNDTRIPTIMEOFFLIGHTRTTOFTHISLIMITSSETUPFORMEASURINGDISTANCESUPTO125M,DUETONECESSARYGUARDINTERVALSBETWEENCONSECUTIVEPULSESTHEMATCHINGMAXIMUMSIGNALRATEWAS125HZFIG1NOMINALVALUESOFATRANSMITTERSOUNDPRESSURELEVELRANGINGWASDONEUSING1KHZOR4KHZPULSESASASAMPLINGFREQUENCYOF100KSPSWASAPPLIED,THERECEIVERREDUCEDPROCESSINGBURDENANDMATCHEDTHESAMEEFFECTIVESAMPLINGFREQUENCY,ASITWASCONSTRUCTEDWITHTWODIFFERENTDOWNSAMPLINGRATIOS1KHZ20,4KHZ–5ASRTTOFRANGINGISUSED,THERESULTINGSYSTEMRESOLUTION,CALCULATEDACCORDINGTO2,OFA1KHZSYSTEMIS33MM,WHILEA4KHZSYSTEMSHOULDBECAPABLEOFDETECTINGOBSTACLESOF825MMFIG2VARIOUSTOFMETHODSAREPRESENTEDIN78THEIMPULSERESPONSEOFTHETRANSDUCERSAMPLEDAT100KHZWITHA12BITADCISSHOWNINFIG3FIG2RANGERESOLUTIONFIG3IMPULSERESPONSEOFTRANSDUCER
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上傳時(shí)間:2024-03-12
頁數(shù): 25
大?。?0.61(MB)
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頁數(shù): 29
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簡介:3700英文單詞,英文單詞,21500英文字符,中文英文字符,中文6400字文獻(xiàn)出處文獻(xiàn)出處PANTEAM,GLIGORD,ANISCECONOMICDETERMINANTSOFROMANIANFIRMS’FINANCIALPERFORMANCEJPROCEDIASOCIALANDBEHAVIORALSCIENCES,2014,124272281ECONOMICDETERMINANTSOFROMANIANFIRMS’FINANCIALPERFORMANCEMARIUSPANTEA,DELIAGLIGOR,CECILIAANISABSTRACTONEOFTHECENTRALQUESTIONSINENTREPRENEURSHIPISWHYSOMEFIRMSSUCCEEDANDOTHERSFAILDETERMININGWHATFACTORSINFLUENCEPERFORMANCEHASIMPLICATIONSFORPROSPECTIVEENTREPRENEURS,ASWELLASADVISORS,INVESTORS,MANAGERSANDSOFORTHTHUS,USINGEXTENSIVEDATAOVERAPERIODOF14YEARS,THISSTUDYEXPLORESANDTESTSTHESIGNOFTHERELATIONSHIPBETWEENMICROECONOMICFACTORSANDFINANCIALPERFORMANCETHEDATASETINCLUDES55ROMANIANINDUSTRIALCOMPANIESLISTEDATTHEBUCHARESTSTOCKEXCHANGEANDCOVERSTHEPERIODOF19992012THROUGHAPANELDATAANALYSIS,RESULTSINDICATETHATTHESIGNOFTHERELATIONSHIPISPOSITIVEANDSTATISTICALLYSIGNIFICANTSUPPORTINGTHEIMPORTANCEANDINDEPENDENCEOFTHESETSOFFACTORSINEXPLAININGPERFORMANCEKEYWORDSFIRMPERFORMANCE,PERFORMANCEMEASUREMENT,RETURNONASSETS,RETURNONEQUITY,MICROECONOMICDETERMINANTS1INTRODUCTIONTHETOPICOFPERFORMANCEISARECURRENTTHEMEINMOSTBRANCHESOFMANAGEMENT,SUBJECTEDTONUMEROUSDEBATESINRECENTYEARS,ESPECIALLYREGARDINGTERMINOLOGY,LEVELSOFANALYSISANDASSESSMENTALTHOUGHTHEIMPORTANCEOFTHEPERFORMANCECONCEPTISWIDELYRECOGNIZED,ITSTREATMENTINRESEARCHSETTINGSISOFTENLACKINGSINCENUMEROUSAUTHORSPRESENTPERFORMANCEMEASUREMENTANDIMPROVEMENTMETHODSWITHOUTACLEAREXPLANATIONOFWHATISBEINGMEASUREDORIMPROVEDASSUCH,OURRESEARCHISFOCUSEDONANALYZINGTHECONNECTIONBETWEENSPECIFICECONOMICANDORGANIZATIONALFACTORSANDFIRM’SPERFORMANCE,TAKINGINTOACCOUNTPREVIOUSNATIONALANDINTERNATIONALSTUDIESANDTHEIRRESULTS,USINGECONOMETRICMODELINGONDATAACQUIREDFROM55ROMANIANCOMPANIESDURINGAPERIODOF14YEARS19992012THEORIGINALITYOFOURRESEARCHRELIESONTHEINFORMATIONALCONTENTOFOURRESULTSANDCONCLUSIONS,TAKINGINTOCONSIDERATIONTHEFACTTHATTHEPROPOSEDTOPICHASBEENMOSTLYTREATEDFROMADESCRIPTIVEPOINTOFVIEWINTHENATIONALLITERATUREANDTHATTHERELIABLEDATATHATOURRESEARCHPROVIDESCONTRIBUTESTOIMPROVINGTHEFIRM’SMAINOBJECTIVE–MAXIMIZINGSHAREHOLDERS’WEALTHTHEPAPERISORGANIZEDASFOLLOWSINTHENEXTSECTIONWEWILLPRESENTTHELITERATUREREVIEWCONCERNINGTHETOPICOFINTEREST,FOLLOWEDBYTHECONCEPTUALMODELANDHYPOTHESIS,METHODOLOGYANDFINDINGSWHILECONCLUSIONSANDFUTURERESEARCHPATHSMARKTHEWORK’SENDING2LITERATUREREVIEWTHELITERATUREONPERFORMANCEANDITSDETERMINANTSISRELATIVELYABUNDANTANDCONCENTRATEDONSEVERALASPECTSSTUDYOFTHEPERFORMANCECONCEPTDEFINITIONANDITSMEASUREMENT,EFFICIENCYANDEFFECTIVENESSANALYSISANDDETERMINANTSOFFIRMPERFORMANCEINTHISPAPERWEAREINTERESTEDINTHELASTMENTIONEDRESEARCHDIRECTIONTHEASSESSMENTOFPERFORMANCEISANINTEGRALCOMPONENTOFTHEMANAGEMENTPROCESSINANYTYPEOFCOMPANYINTHISCONTEXT,MANYAPPROACHESHAVEBEENDEVELOPED,AMONGWHICH,INRECENTYEARS,PRODUCTIVITYANDEFFICIENCYANALYSESASWELLASDIFFERENTTYPESOFPROFITABILITYRATIOSHAVEBEFORE1980THEROI,ROE,ROCEANDDERIVATESSIMONSROIMOSTIMPORTANTMEASUREFORINVESTORSITISARATIOOFTHEPROFITOUTPUTOFTHEBUSINESSASAPERCENTAGEOFFINANCIALINVESTMENTINPUTSROEADOPTINSTEADTHEPERSPECTIVEOFMANGERS,THOSEENTRUSTEDBYSHAREHOLDERSTOGENERATEPROFITASARATIOOFEQUITYROCEAVARIANTWHICHREFERSTOTHEASSETSWITHINAMANAGER’SDIRECTSPANOFCONTROL1982THEECONOMICVALUEADDEDMODELEVASTERNSTEWARTCOEVAISAFINANCIALMANAGEMENTSYSTEMTHATPROVIDESACOMMONLANGUAGEFOREMPLOYEESACROSSALLOPERATINGANDSTAFFFUNCTIONSANDALLOWSALLMANAGEMENTDECISIONSTOBEMODELLED,MONITORED,COMMUNICATEDANDCOMPENSATEDINASINGLEANDCONSISTENTWAY,ALWAYSINTERMSOFTHEVALUEADDEDTOSHAREHOLDERINVESTMENT1988THEACTIVITYBASEDCOSTINGABCCOOPERANDKAPLANABCWASINTRODUCEDTOADDRESSTHESHORTCOMINGSOFTYPICALSINGLEDRIVERVOLUMEBASEDCOSTACCOUNTINGSYSTEMSTHEIDEAATTHEBASEOFTHEMODELISTHATALLOFACOMPANY’SACTIVITIESTHATEXISTTOSUPPORTTHEPRODUCTIONANDDELIVERYOFGOODSANDSERVICESSHOULDBECONSIDEREDPRODUCTCOSTS1990THECUSTOMERVALUEANALYSISCVACUSTOMERVALUE,INCCVAAIMSTOBEAPMSEXCLUSIVELYMARKETDRIVEN,BYFIXINGALLPERFORMANCEMEASURESAROUNDMARKETPARAMETERSDECISIONMAKINGISBASEDONTHESEMEASURESTHEMODELWORKSTOGETHERWITHTOOLS,SUCHASVALUEPRICINGCHARTS,BENCHMARKINGANALYSIS,PRODUCTATTRIBUTESSCORECOMPARISON,PRIORITIESCHART,ETCTHEEXTREMEFOCUSONMARKET,THEMAINCHARACTERISTICOFTHEMODEL,ISALSOALIMITINGFACTOR1992THEBALANCEDSCORECARDBSCKAPLANANDNORTONTHEBSCPROPOSESAHOLISTICVIEWOFTHEORGANIZATIONBYINTEGRATINGFOURPERSPECTIVESOFPERFORMANCEFINANCIAL,CUSTOMER,INTERNALBUSINESS,ANDINNOVATIONANDGROWTHTHEFINANCIALPERSPECTIVESHAREHOLDERVALUEISTHEFINALAIMOFTHEBUSINESS,EVENIFTHEYRECOGNIZETHENEEDTOBALANCEWITHTHEOTHERTHREEDIMENSIONSTHEAUTHORSSTRESSTHEIMPORTANCEOFIDENTIFYINGTHEDRIVERSOFPERFORMANCEANDEMPHASIZECOMPANYALIGNMENTTOSTRATEGYTHROUGHTHEUSEOFPERFORMANCEMEASURES1994THESERVICEPROFITCHAINSPCHESKETTETALSPCHASTWOMILESTONESFRONTLINEWORKERSANDCUSTOMERTHATARETHECENTREOFMANAGEMENTCONCERNTHEAUTHORSESTABLISHEDAPATHCHARACTERIZEDBYCAUSEEFFECTRELATIONSAMONGPROFITABILITY,CUSTOMERLOYALTY,EMPLOYEESATISFACTIONANDPRODUCTIVITYTHEFRAMEWORKDOESNOTOFFERANYSPECIFICSUGGESTIONSFORIMPLEMENTATION1997THEINTEGRATEDPERFORMANCEMEASUREMENTSYSTEMIPMSBITITCIETALIPMSARGUETHATTHEPERFORMANCEMANAGEMENTPROCESSISACLOSEDLOOPBYWHICHTH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