济大泉院毕业设计外文资料翻译.docx

济大泉院毕业设计外文资料翻译.docx

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济大泉院毕业设计外文资料翻译

济南大学泉城学院

毕业设计外文资料翻译

题目为提高信息理解涉及的LED设计因素

专业　电气工程及其自动化　　

班级　电气１１０２　

学生　　XXXX　　　　

学号XXXXXXXXXXXXXX　

指导教师　　XXXXX　　　　　

二〇一五年三月十五日

DesignFactorsofLEDDisplayforImprovingMessage

Comprehension

JoeyC.Y.SoandAlanH.S.Chan

DepartmentofManufacturingEngineeringandEngineeringManagement

CityUniversityofHongKong

KowloonTong

HongKong

Mostofthepreviousstudiesondynamictextdisplaywerelimitedtosmallscreendisplaysandwebsitedesign.Sofar,nostudiesfoundonLED（light-emittingdiode）displayboardforoptimaldisplaymethod.ItisaninterestingquestionofwhatthebestdisplaymethodistodeliverelectronictextmessagestothepublicwithLEDdisplays.Inthispaper,somerelatedempiricalstudiesconcerningthevariousdisplaymethodsofdynamictextpresentation,suchastextdisplaytype,numberofmessagelinesandtextbackgroundcolorcombinationarereviewed.AproposedexperimentofChinesereadingtaskonLEDdisplayunderdifferenttaskconditionsfordeterminingtheeffectsofdisplaymethod,numberofmessagelinesdisplayed,andtextcoloroncomprehensionperformanceandsubjectivepreferenceisalsodiscussedinthispaper.Accordingtothereadabilityandpreferenceratingsofthesubjectsgivenunderdifferentconditions,wecanmakeuseoftheproposedexperimenttoinvestigatethebestdisplaymethodandcolorforcomprehendingthedeliveredmessages,andtoprovideusefuldesignrecommendationsofusingLEDdisplaysforadvertisinganddeliveringmessagestothepublic.

INTRODUCTION

Nowadays,theuseoftheelectronicinformationdisplaysystemsprovidesanextrameansofdeliveringmessagesoradstocustomersorpeopleduringtheirtravelstoworkinourfast-pacedsociety.Theadvanceddisplaytechnologyoffersavarietyofselectionofcolorsanddisplaymethodswhichimprovethepresentationoftextualinformation.LED（Light-emittingdiode）displayswidelyusedasadisplayoutputunitlikeacomputerscreen.Itallowsobserverstoreadmessagesatadistance.TheexplosionofcommunicationtechnologyinthepastdecadesandtheincreaseinuseofLEDdisplaysarousetheinterestinoptimizingeffectivemethodsofdisplayingdynamictext.However,inthepast,researchersonlyfocusedonthestudiesofdynamictextdisplayonsmallscreenssuchascellularphones,pagersanddesktopphones（ChenandChien2005,Laarni2002）andsomeresearcheswereconcernedabouttheoptimaldynamictextdisplayinwebsitedesign（Wangetal.2003,WangandChen2003,Wangetal.2002）.Sofar,nostudiesfoundonLEDdisplayboardforoptimaldisplaymethod,inparticular,Chinesereading.ItisaninterestingquestionofwhatthebestdisplaymethodistodeliverelectronictextmessagestothepublicwithLEDdisplays.

Thethreecommondisplaymethodsfordisplayingdynamicstextare:

a）RSVP（RapidSerialVisualPresentation）–displayssuccessivewordsoftextualinformationatafixedpointonthescreen,usuallyatapredeterminedrate,inrapidsuccession;b）scrolling-ablockoftextmovesupordownineitherarelativelycontinuousoraline-by-linemanner;andc）leading（TimeSquare）-presentsthewordsbysequenceandmovesthestringofwordsfromrighttoleft.Inmanyresearchesonscrolling,thescrollingspeedwasalwayscontrollablebytheoperatorsordesignersinwhichtheymovedthroughthedocumentbyoperatingaandHaselgrove2001）orascrollarrow（Piolatetal.1997）.However,thefixeddisplayspeedmethodwasemployedinthecurrentexperiment.Regardingtheverticalscrolling,textusuallymovesinaline-by-linemannerorscrollscontinuouslyandautomaticallyarasteratatimeupfromthebottomofthescreen.Sincetheleadingmethodisnotpracticalofdisplayingmulti-linetext,onlyRSVPandscrollingmethodsweretestedinthecurrentstudytoinvestigatetheeffectsofthenumberoflinesdisplayedonthecomprehensionperformanceandpreference.ThepresentationofshorttextsegmentsinRSVPeliminateseyemovementsandleadstoapossiblereductionofcognitiveload（Potter1984）.

Concerningthenumberofmessagelines,WangandCao（2005）studiedthemessagedisplayformatofportabledynamicmessagesigns,theirresultsshowedthatasingle-linemessagewasbetterthanamultiple-linemessage.Withthesmallernumberoflinesdisplayed,itwouldfacilitatereadersbydirectingtheirattentiontotheappropriatetextunitinitsproperorderandeliminatetheirneedtodecidewhereandwhentheeyesshouldmovenext.

Therearesomeresearchesreportingthatcolorcontrastofthetextbackgroundofadynamicdisplayusers?

visualperformance（Wangetal.2002,WangandChen2003）.ArecentstudybyYangetal.（2005）aboutenhancingmessagesdisplayedonadynamicmessagesignshowedthatifonlyonecolorwasused,amberorgreenwouldbemuchpreferredoverred.Theyalsofoundthatamber-coloredmessageswouldleadtotheshortestresponsetimeandthatwithred-coloredmessages,subjectswouldtakelongertimetorespondtothemessages.AwiderangeofcolorsisavailablewiththeLEDdisplays,andmostcolorsbeingused

arered,green,andamber.

PROPOSEDSTUDY

Basedontheaboveliteraturereview,itisnotedthatnostudydoneonexploringthechoiceofeffectivecolorsorcolorcombination,displaymethodandnumberofmessagelinesforincreasingthereadabilityofmessagesdeliveredfromLEDdisplays.Tofillthegapintheliterature,thereisaneedtoconductaresearchstudywhichmorethoroughlyinvestigatesthesefactorsconsideringcomprehensionperformanceandsubjectivepreference.

Design

Theaimoftheproposedexperimentistoevaluatewhetherdisplaymethod,rownumberandtextcolorwouldsignificantlyaffectthecomprehensionscoreandsubjectivepreferenceonLEDdisplayforChinesereading.Thefactorsandlevelsstudiedinthisexperimentareasfollows:

twotextdisplaymethods（RapidSerialVisualPresentation,scrollingwithpause）,fourtypesofrownumber（onetofourlines）,andthreetextcolors（red,greenandamber）.Ineachtestingcondition,thecomprehensionscoresoftheobjectiveperformancemeasureandtheratingsofthesubjectivemeasurewillbecollected.Thecomprehensionscoreoftheobjectiveperformancemeasuredenotedthecorrectnessofsubjectresponsesgiventotheninemultiplechoicequestionsinacomprehensiontaskfollowingthepassagereading.Itwillbeusedfortheevaluationofthesubjects'abilityofunderstandingthepassagesread.Thepreferenceratingisasubjectiveevaluationofthetestingdisplayformatgivenbythereadersreflectingindividualpreference,whichshouldalsobeconsideredwhendesigninganoptimaldisplaymethod.

Subjects

StudentswhoareregisteredforacourseinErgonomicsintheCityUniversityofHongKongwillserveassubjects.TheywillbeassessedtowithanorthoratorandnocolordeficiencywithIshiharaPesudoIsochromaticPlates.

Materials

Chinesepassageswithnotechnicaltermsornamesofunusualwordsontopicsofwillbeused.Thepassagelength,includingpunctuationmarks,rangesfrom77to100characters.

Apparatus

Acomputer（PentiumVI——2.8GHz）witha582mmX326mm（include.Thepanelsizeis512mmX256mm.TheLEDdisplaydotdimensionis128dotsX64dotsanditsdotdiameteris3.75mmwith4mmdotseparation.Itcandisplayupto4rowsof8traditionalChinesecharactersof64mmX64mmlargeperline.Thepassageswillbedisplayedatarateof160charactersperminute.

WorkplaceConditions

Thedisplaywillbemountedatacenter.Thecharacterssizewillsubtendanglesof1。

13,arcatthesubjects,eyes.Theambientilluminationwillbeabout300lx.Noglareorreflectionappearsonthedisplayscreen.

Procedure

Asetofquestionsheetswiththreequestionsonapagewillbegiventoeachsubjectatthebeginningofthetest.However,theyarenotallowedtopreviewthequestionsbeforeeachpresentation.SubjectsareaskedtoreadthepassagespresentedontheLEDdisplayandtrytheirbesttounderstandthemessages.Eachpresentationconditionconsistsofthreepassages.Afterreadingthefirstpassageonthedisplay,theywillbeinstructedtoattemptthethreemultiple-choicequestionsonthefirstsheetofthequestionset.Afteroneminute,thenextpassagewillappearonthedisplay.Theprocedureisrepeateduntilallthethreepassagesintheconditionarecompleted.Justafterreadingthethreepassages,apreferenceratingonthatparticularconditionwillbegivenbythesubjectonanine-pointLikertscale.Theproceduresarerepeateduntilalltheeightconditionsweretested.Inordertoavoidmentalorvisualfatigue,a5-minutebreakisgivenafterreadingthefirst12passages.

DATAANALYSIS

ComprehensionPerformance

Thedependentmeasurecollectedinthisexperimentisthecomprehensionscores（%）,i.e.thepercentageofcorrectnessdenotedthereadingperformanceofeachcondition.Themethodforcalculatingthepercentageofcorrectnessforeachcondition=（thenumberofquestions?

thenumberofwronganswers）thetotalnumberofquestions.Thecomprehensionscoresofindividualsubjectsrangedfrom0to9wereconvertedto0to100%.Toidentifywhichdisplaymethodwouldletcandidatesachievebetterperformanceinthecomprehensiontask,thedifferencesamongstsubjects?

performanceonthedifferentdisplayconditionswillbeevaluatedwithanalysisofvariance（ANOVA）.Bonferronitestwillbeusedforpostcomprehensionscore,thesecondmeasureinthisreadingexperimentisthesubjectivepreferencereflectinganinstantandquicksubjectiveresponseofsubjectstothereadingconditions.Withanine-pointLik