TDSCDMA 基站底层驱动软件开发测试需求分析子系统性能优化及验证工作.docx

TDSCDMA 基站底层驱动软件开发测试需求分析子系统性能优化及验证工作.docx

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TDSCDMA基站底层驱动软件开发测试需求分析子系统性能优化及验证工作

Anobject-orientedhigh-leveldesign-basedclasscohesionmetric 

Classcohesionisanimportantobject-orientedsoftwarequalityattribute.Assessingclasscohesionduringtheobject-orienteddesignphaseisoneimportantwaytoobtainmorecomprehensibleandmaintainablesoftware.Inpractice,assessingandcontrollingcohesioninlargesystemsimpliesmeasuringitautomatically.Oneissuewiththefewexistingcohesionmetricstargetedatthehigh-leveldesignphaseisthattheyarenotbasedonrealisticassumptionsanddonotfulfillexpectedmathematicalproperties.

Anexperimentalstudyontheeffectofmobilephoneconversationondrivers'reactiontimeinbrakingresponse  

Thispaperpresentsanexperimentalstudyinwhichtheeffectofthreefactors（distancebetweencars,mobilecallduration,andtimeofdriving（dayornight））ondrivers'reactiontimeinbrakingresponsewasinvestigated.

Methods

Theexperimentwasperformedinarealdrivingenvironmentinwhich27maleadultsbetweentheagesof22and24 yearsparticipated.Threelevelsofthefirsttwofactors（i.e.,distancebetweencarsandcallduration）andtwolevelsofthelastfactor（i.e.,timeofdriving）wereselectedtoconducttheexperimentalstudy.Afullfactorialdesignofexperimentwith18treatmentcombinationsandthreereplicatesofeachcombinationwereused.Fifty-fourtrialrunswereperformedinarandommannerandforeachrundrivers'reactiontimeinbrakingresponsewasmeasured,whichservedthedataforfurtheranalysis.Analysisofvariance（ANOVA）,interactioneffectanalysis,andvariousmodeladequacytestswerecarriedoutusingDesignExpertsoftware.

Results

Theresultsofthestudyindicatedthatthemostimportantfactoraffectingthedrivers'reactiontimeincarbrakingresponsewasthemobilecalldurationfollowedbythetimeofdriving,withahighlevelofinteractionbetweenthetwofactors.Itwasalsofoundthatthedistancebetweencarsdidnotseemtohaveasignificanteffectonthereactiontimeinbrakingresponse.Itistobenotedthattheseresponsetimesareexpectedtobehigherundernormaldrivingconditionswhereawarenessofexperimentalenvironmentisnotpresent.

ImpactonIndustry

Thefindingsofthisstudywouldhelpmobilephoneindustriesinimprovingsafetyofmobilephoneusersindrivingenvironment.

Towardsautomationofcontrolsoftware:

Areviewofchallengesinmechatronicdesign 

Developmentofmechatronicsystemsrequirescollaborationamongexpertsfromdifferentdesigndomains.Inthispapertheauthorsidentifyasetofchallengesrelatedtothedesignofmechatronicsystems.Thechallengesaremostlyrelatedtointegrationofdesignandanalysistools,andautomationofcurrentdesignpractices.Addressingthesechallengesenablestheadoptionofaconcurrentdevelopmentapproachinwhichthesynergeticeffectsthatcharacterizemechatronicsystemsaretakenintoaccountduringdesign.Themainargumentisthatinordertodealwithsoftwaredevelopmentproblemsforcomplexmechatronicsystems,thereisaneedtolookatsystemdesignpracticesbeyondconcurrency,i.e.,thereisaneedtoconsiderthecomplexinterdependenciesamongsubsystemsandthedesignersthatdevelopthem.Areviewoncurrentmethodsandtoolsiscarriedouttoidentifypossiblesolutionsproposedinpreviousworks.Thepurposeisnottomakeanextensivereview,buttoshowthatintegration,fromdifferentpointsofview,isamajorissueandthatincreasingthelevelofabstractioninthedescriptionofsystemscanhelptoovercometheintegrationchallenges.Anincreasedlevelofabstractionalsoformsabasisforaddressingotherissuesinmechatronicproductdevelopment,whicharepresentedinthiswork.Withthatinmind,conceptsforanintegrationframeworkareproposed.Thegoaloftheframeworkistosupportamulti-disciplinarydesignteamto（almost）automaticallygenerateandverifycontrolsoftware.Basedonhigh-levelarchitecturaldescriptions,thesoftwaregenerationandverificationprocesscanbesupportedbyknowledge-basedmethodsandtools.Othergoalsaretosupportcommunicationamongengineers,improvereliabilityofdesigns,increasereuseofdesignknowledge,andreducedevelopmenttimeanddevelopmentcosts.

自动化控制软件英语自学读物：

机械电子学设计工程的挑战（文献与历史研究回顾）

Handlingcommunicationsinprocessalgebraicarchitecturaldescriptionlanguages:

Modeling,verification,andimplementation 

Architecturaldescriptionlanguagesareausefultoolformodelingcomplexsoftwaresystemsatahighlevelofabstraction.Ifbasedonformalmethods,theycanalsoserveforenablingtheearlyverificationofvariouspropertiessuchascomponentcoordinationandforguidingthesynthesisofcodecorrectbyconstruction.Thisisthecasewithprocessalgebraicarchitecturaldescriptionlanguages,whichareprocesscalculienhancedwiththemainarchitecturalconcepts.However,thetechniqueswithwhichthoselanguageshavebeenequippedaremainlyconceivedtoworkwithsynchronouscommunicationsonly.Theobjectiveofthispaperisthreefold.Onthemodelingside,weshowhowtoenhancetheexpressivenessofatypicalprocessalgebraicarchitecturaldescriptionlanguagebyincludingthecapabilityofrepresentingnonsynchronouscommunicationsinsuchawaythattheusabilityoftheoriginallanguageispreserved.Ontheverificationside,weshowhowtomodifytechniquesforanalyzingtheabsenceofcoordinationmismatcheslikethecompatibilitycheckforacyclictopologiesandtheinteroperabilitycheckforcyclictopologiesinsuchawaythatthosechecksarevalidalsofornonsynchronouscommunications.Ontheimplementationside,weshowhowtogeneratemultithreadedobject-orientedsoftwareinthepresenceofsynchronousandnonsynchronouscommunicationsinsuchawaythatthepropertiesprovedatthearchitecturallevelarepreservedatthecodelevel.

Softwareperformancesimulationstrategiesforhigh-levelembeddedsystemdesign  

Asmostembeddedapplicationsarerealizedinsoftware,softwareperformanceestimationisaveryimportantissueinembeddedsystemdesign.Inthelastdecades,instructionsetsimulators（ISSs）havebecomeanessentialpartofanembeddedsoftwaredesignprocess.However,ISSsareeithersloworverydifficulttodevelop.Withtheadventofmultiprocessorsystemsandtheirever-increasingcomplexity,thesoftwaresimulationstrategybasedonISSsisnolongerefficientenoughforexploringthelargedesignspaceofmultiprocessorsystemsinearlydesignphases.MotivatedbythelimitationsofISSs,alotofrecentresearchactivitiesfocusedonsoftwaresimulationstrategiesbasedonnativeexecution.Inthisarticle,wefirstintroducesomeexistingsoftwareperformancesimulationstrategiesaswellasourownapproachforsourcelevelsimulation,calledSciSim,andprovideadiscussionabouttheirbenefitsandlimitations.Themaincontributionofthisarticleistointroduceanewsoftwareperformancesimulationapproach,callediSciSim（intermediateSourcecodeinstrumentationbasedSimulation）,whichachieveshighestimationaccuracy,highsimulationspeedandlowimplementationcomplexity.AlltheseadvantagesmakeiSciSimwell-suitedforsystemleveldesign.Toshowthebenefitsoftheproposedapproach,wepresentaquantitativecomparisonbetweeniSciSimandtheotherdiscussedtechniques,usingasetofbenchmarks.

高层次嵌入式系统软件的效能评估策略

Useofapasturegrowthmodeltoestimateherbagemassatapaddockscaleandassistmanagementondairyfarms  

Aclimate-drivenpasturemodelisusedtopredictherbagemassondairyfarms.

Fourmodelparametersarefittedtotheobserveddataforeachpaddock（learning）.

ClimatedatafromtheVirtualClimateStationNetworkareusedtodrivethemodel.

PreliminarytestingontwocommercialdairyfarmsofNewZealandwassatisfactory.

ThemodelestimatedherbagemasswithanR2of80%andsmallbias.

TheapplicationofGPSprecisepointpositioningtechnologyinaerialtriangulation  

GPS的点定位技术精度提高方法的应用与实施

IntraditionalGPS-supportedaerotriangulation,differentialGPS（DGPS）positioningtechnologyisusedtodeterminethe3-dimensionalcoordinatesoftheperspectivecentersatexposuretimewithanaccuracyofcentimetertodecimeterlevel.Thismethodcansignificantlyreducethenumberofgroundcontrolpoints（GCPs）.However,theestablishmentofGPSreferencestationsforDGPSpositioningisnotonlylabor-intensiveandcostly,butalsoincreasestheimplementationdifficultyofaerialphotography.ThispaperproposesaerialtriangulationsupportedwithGPSprecisepointpositioning（PPP）asawaytoavoidtheuseoftheGPSreferencestationsandsimplifytheworkofaerialphotography.

Firstly,wepresentthealgorithmforGPSPPPinaerialtriangulationapplications.Secondly,theerrorlawofthecoordinateofperspectivecentersdeterminedusingGPSPPPisanalyzed.Thirdly,basedonGPSPPPandaerialtriangulationsoftwareself-developedbytheauthors,foursetsofactualaerialimagestakenfromsurveyingandmappingprojects,differentinbothterrainandphotographicscale,aregivenasexperimentalmodels.Thefoursetsofactualdataweretakenoveraflatregionatascaleof1:

2500,amountainousregionatascaleof1:

3000,ahighmountainousregionatascaleof1:

32000andanuplandregionatascaleof1:

60000respectively.Intheseexperiments,theGPSPPPresultswerecomparedwithresultsobtainedthroughDGPSpositioningandtraditionalbundleblockadjustment.Inthisway,theempiricalpositioningaccuracyofGPSPPPinaerialtriangulationcanbeestimated.Finally,theresultsofbundleblockadjustmentwithairborneGPScontrolsfromGPSPPPareanalyzedindetail.

TheempiricalresultsshowthatGPSPPP