创新的技术应用体验魅力的时尚设计享受科技生活工作和娱乐休闲.docx

创新的技术应用体验魅力的时尚设计享受科技生活工作和娱乐休闲.docx

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创新的技术应用体验魅力的时尚设计享受科技生活工作和娱乐休闲

Amemeticalgorithmforoptimaldynamicdesignofwirelesssensornetworks 

ComputerCommunications

Wepresentamemeticalgorithmthatdynamicallyoptimizesthedesignofawirelesssensornetworktowardsenergyconservationandextensionofthelifespanofthenetwork,takingintoconsiderationapplication-specificrequirements,communicationconstraintsandenergyconsumptionofoperationandcommunicationtasksofthesensors.Thememeticalgorithmmodifiesanalreadysuccessfulgeneticalgorithmdesignsystemandmanagestoimproveitsperformance.Theobtainedoptimalsensornetworkdesignssatisfyallapplication-specificrequirements,fulfilltheexistingconnectivityconstraintsandincorporateenergyconservationcharacteristicsstrongerthanthoseoftheoriginalgeneticalgorithmsystem.Energymanagementisoptimizedtoguaranteemaximumlifespanofthenetworkwithoutlackofthenetworkcharacteristicsthatarerequiredbythespecificsensingapplication.

ArticleOutline

1.Introduction

2.WSNdesignproperties

2.1.WSNmodeling

2.2.Designparameters

2.2.1.Applicationspecificparameters

2.2.2.Connectivityparameters

2.2.3.Energyrelatedparameters

3.OriginalGA-basedalgorithm

3.1.MethodologyofGA

3.2.GA-baseddynamicoptimaldesignalgorithm

4.Memeticalgorithmapproach

4.1.Localsearch

4.2.Thresholdupdateschemes

5.Results

5.1.Networkcharacteristics

5.2.Energyconservation

6.Discussion

7.Conclusions

References

Radioresourcemanagementinemergingheterogeneouswirelessnetworks  OriginalResearchArticle

ComputerCommunications

Deploymentofheterogeneouswirelessnetworksisspreadingthroughouttheworldasuserswanttobeconnectedanytime,anywhere,andanyhow.Meanwhile,theseusersareincreasinglyinterestedinmultimediaapplicationssuchasvideostreamingandVoiceoverIP（VoIP）,whichrequirestrictQualityofService（QoS）support.Provisioningnetworkresourceswithsuchconstraintsisachallengingtask.Infact,consideringtheavailabilityofvariousaccesstechnologies（WiFi,WiMAX,orcellularnetworks）,itisdifficultforanetworkoperatortofindreliablecriteriatoselectthebestnetworkthatensuresusersatisfactionwhilemaximizingnetworkutilization.DesigninganefficientRadioResourceManagement（RRM）,inthistypeofenvironment,ismandatoryforsolvingsuchproblems.InordertoprovideabetterunderstandingofRRM’sdesign,thispaperpresentsadetailedinvestigationofkeychallengesthatconstituteanefficientRRMframework.Moreimportantly,anoverviewwithaclassificationofrecentsolutions,intermsofdecisionmaking,isprovidedalongwiththediscussion.

ArticleOutline

1.Introduction

2.Radioresourcemanagementinheterogeneouswirelessnetworks

2.1.Heterogeneouswirelessnetworks

2.2.Radioresourcemanagement

3.Decisionmechanisms

3.1.Network-centricapproach

3.2.User-centricapproach.

3.3.Collaborativeapproach

4.Importantconcerns

4.1.QoSsupport

4.2.Mobilitysupport

4.3.Architecturaldesign

5.Conclusionsandfutureworks

References

Constructiondefectmanagementusingatelematicdigitalworkbench  OriginalResearchArticle

AutomationinConstruction

Real-time,rich-mediadatacommunicationbetweentheconstructionsiteandtheoff-sitedesignofficeisbecomingoneoftheimportantresearchareasininformationtechnologyforconstruction.Thispaperpresentstheconceptofatelematicdigitalworkbench,ahorizontaltabletopuserinterfaceintegratingmobilecomputingandwirelesscommunicationtofacilitatesynchronousconstructionsitetoofficecollaboration.Wedemonstratethecapabilitiesandpotentialsofthissystemconceptforconstructiondefectmanagement.Theon-sitecrewusesahandheldmobiledevicetocollectdefectinformationandtransferstheinformationtothedesignofficethroughwirelesscommunicationbysendingtheinformationtoadatabaselistener.Thedigitalworkbenchapplicationmonitorsthedatabaseandsynchronizesthelocationofthevisualinformationonthesitewiththe3Dmodelontheserver.Integratedwith3DviewingcapabilityinaCADsystem,designerscaninteractwiththecombinedmodel/sitedatausingahorizontalandverticalscreen.Acasestudycomparedthetelematicdigitalworkbenchagainstpaper-basedandPocketPC-basedmethodsfordefectmanagementinacontrolledlaboratoryexperiment.Thecasestudyresultsshowthatthetelematicdigitalworkbenchhasthepotentialtoimprovetheaccuracyofmatchingsitedatatodigitaldataandreduceinformationlossbetweensiteandofficecollaboration.

ArticleOutline

1.Introduction

2.Background

2.1.Constructiondefectmanagement

2.2.Remotedesigncollaborationandemergingtechnologiesintheconstructionindustry

3.Mobileinspectionsystemon-site

3.1.On-sitedefectreportingapplication

3.2.Wirelesscommunication

4.Telematicdigitalworkbenchindesignoffice

4.1.Digitalworkbenchwithtangibleinteraction

4.2.Designdescriptionsofthetelematicdigitalworkbench

4.3.Synchronousdesigncollaborationusingthetelematicdigitalworkbench

5.Casestudy

5.1.Experiment

5.2.Experimentset-up

5.2.1.Participants

5.2.2.Defecttasks

5.2.3.Experimentprocess

5.2.4.Threefocusedprocesses

5.3.Observations

5.3.1.Paper-basedmethod

5.3.2.PocketPC-basedmethodusingcommercialsoftware

5.3.3.Telematicdigitalworkbenchmethod

5.4.Analysisofquestionnaireanswers

5.4.1.Perception

5.4.2.Performance

5.4.3.Collaboration

5.4.4.Suggestionsandcomments

6.Summaryanddiscussion

Acknowledgements

References

Areactiveroleassignmentfordataroutinginevent-basedwirelesssensornetworks  OriginalResearchArticle

ComputerNetworks

Inthiswork,weshowhowwecandesignaroutingprotocolforwirelesssensornetworks（WSNs）tosupportaninformation-fusionapplication.Regardingtheapplication,weconsiderthatWSNsapplyinformationfusiontechniquestodetecteventsinthesensorfield.Particularly,inevent-drivenscenariostheremightbelongintervalsofinactivity.However,atagiveninstant,multiplesensornodesmightdetectoneormoreevents,resultinginhightraffic.Tosaveenergy,thenetworkshouldbeabletoremaininalatentstateuntilaneventoccurs,thenthenetworkshouldorganizeitselftoproperlydetectandnotifytheevent.Basedonthepremisethatwehaveaninformation-fusionapplicationforeventdetection,weproposearoleassignmentalgorithm,calledInformation-Fusion-basedRoleAssignment（InFRA）,toorganizethenetworkbyassigningrolestonodesonlywheneventsaredetected.TheInFRAalgorithmisadistributedheuristictotheminimalSteinertree,anditissuitablefornetworkswithsevereresourceconstraints,suchasWSNs.Theoreticalanalysisshowsthat,insomecases,ouralgorithmhasaO

（1）-approximationratio.SimulationresultsshowthattheInFRAalgorithmcanuseonly70%ofthecommunicationresourcesspentbyareactiveversionoftheCentered-at-Nearest-Sourcealgorithm.

ArticleOutline

1.Introduction

2.Relatedwork

3.Background

3.1.Networkandeventmodel

3.2.Deploymentmodel

3.3.Roleassignmentmodel

4.Problemstatement

5.InFRA:

Information-Fusion-basedRoleAssignment

5.1.Clusterformation

5.2.Routeformation

5.3.Informationfusion

5.3.1.Intra-clusterfusion

5.3.2.Inter-clusterfusion

5.4.Eventdetection

5.5.Dynamictopologies

5.6.Rolemigration

6.Theoreticalresults

6.1.Approximationratio

6.2.Acomplexityanalysis

7.Simulationresults

7.1.Methodology

7.2.Reactivevs.proactiveroleassignment

7.3.Communicationrange

7.4.Networkscalability

7.5.Eventscalability

7.6.Eventsize

7.7.Density

7.8.Eventduration

8.Finalremarks

Acknowledgements

References

AdaptiveCMOSanalogcircuitsfor4Gmobileterminals—Reviewandstate-of-the-artsurvey  OriginalResearchArticle

MicroelectronicsJournal

Thefourth-generation（4G）ofcellularterminalswillintegratetheservicesprovidedbypreviousgenerationssecond-generation/third-generation（2G/3G）withotherapplicationslikeglobalpositioningsystem（GPS）,digitalvideobroadcasting（DVB）andwirelessnetworks,coveringmetropolitan（IEEE802.16）,local（IEEE802.11）andpersonal（IEEE802.15）areas.Thisnewgenerationofhand-heldwirelessdevices,alsonamedalways-best-connectedsystems,willrequirelow-powerandlow-costmulti-standardchips,capableofoperatingoverdifferentco-existingcommunicationprotocols,signalconditions,batterystatus,etc.Moreover,theefficientimplementationofthesechipsetswilldemandforreconfigurableradiofrequency（RF）andmixed-signalcircuitsthatcanadapttothelargenumberofspecificationswithminimumpowerdissipationatthelowestcost.

NanometerCMOSprocessesareexpectedtobethebasetechnologiestodevelop4Gsystems,assuringmassproductionatlowcostthroughincreasedintegrationlevelsandextensiveuseofdigitalsignalprocessing.However,theintegrationinstandardCMOSofincreasinglycomplexanalog/RFpartsimposesanumberofchallengesandtrade-offsthatmaketheirdesigncritical.

Thesechallengesareaddressedinthispaperthroughacomprehensiverevisionofthestate-of-the-artontransceiverarchitectures,buildingblocksanddesigntrade-offsofreconfigurableandadaptiveCMOSRFandmixed-signalcircuitsforemerging4Gsystems.

ArticleOutline

1.Introduction

2.Reviewof4Gwirelesssystems

3.Multi-standardwirelesstransceivers

4.FlexibleCMOScircuitsfortheRF-frontend

4.1.Low-noiseamplifiers

4.2.Mixers

4.3.FrequencysynthesizersandLO-generationcircuits

5.FlexibleCMOScircuitsforthemixed-signalBB

5.1.Channelselection

5.2.Multi-standardfilteringtechniques

5.3.Reconfigurable