简介:Recently,Changetal.proposedaSudoku-basedsecretimagesharingscheme.TheyutilizedtheSudokugridtogeneratemeaningfulshadowimages,andtheirschemesatisfiedallessentialrequirements.BasedonChangetal.'sscheme,weproposeanovel(n,n)secretimagesharingschemebasedonSudoku.Intheproposedscheme,asecretimagecanbesharedamongndifferentcoverimagesbygeneratingnshadowimages,andthesecretimagecanbereconstructedwithoutdistortionusingonlythesenshadowimages.Also,theproposedschemecansolvetheoverflowandunderflowproblems.Theexperimentalresultsshowthatthevisualqualityoftheshadowimagesissatisfactory.Furthermore,theproposedschemeallowsforalargeembeddingcapacity.
简介:InviewofthelimitationsofaRn-GnmodelinthelowfrequencyrangeandthedefectsofanEn-Inmodelincommonusenow,thispaperbuildsacompleteEn-Inmodelaccordingtothetheoryofrandomharmonic.Theparametersforthelow-noisedesignsuchastheequivalentinputnoisyvoltageEns,theoptimumsourceimpedanceZsoptandtheminimumnoisefigureFmincanbecalculatedaccuratelybyusingthisEn-Inmodelbecauseitconsidersthecoherencebetweenthenoisesourcesfully.Moreover,thispaperpointsoutthatitwillcausethemaximum30%miscalculationwhenneglectingtheeffectsofthecorrelationcoefficient7.Usingtheseries-seriescircuitsasanexample,thispaperdiscussesthemethodsfortheEn-InnoiseanalysisofelectroniccircuitspreliminarilyanddemonstratesitscorrectnessthroughthecomparisonbetweenthesimulatedandmeasuredresultsoftheminimumnoisefigureFminofasinglecurrentseriesnegativefeedbackcircuit.
简介:Linearcomplexityandk-errorlinearcomplexityofthestreamcipheraretwoimportantstandardstoscaletherandomicityofkeystreams.Forthe2n-periodicperiodicbinarysequencewithlinearcomplexity2n1andk=2,3,thenumberofsequenceswithgivenk-errorlinearcomplexityandtheexpectedk-errorlinearcomplexityareprovided.Moreover,theproportionofthesequenceswhosek-errorlinearcomplexityisbiggerthantheexpectedvalueisanalyzed.
简介:UT718、UT318、UT708-SY为斯达康公司推出的新品手机,其中UT718是彩屏机,且具有摄像功能,而UT318和UT708-SY都是单色屏幕。这三款手机在功能、外观上差异很大,但在某些电路结构上却有共性,而且与该公司早期机型的某些电路也有相同之处。如:这三款手机的功放电路完全相同,功放IC可相互代换;UT318与UT218手机硬件构造和软件功能完全相同,318手机的电路结构又与700U/U+几乎相同,因此其芯片完全可与700U的相互代换;718手机的中频IC、锁相环电路与702-S331手机的完全相同。下面就从电路结构上对这三款手机进行分析比较。
简介:Theinfluenceofp-typeGaN(pGaN)thicknessonthelightoutputpower(LOP)andinternalquantumefficiency(IQE)oflightemittingdiode(LED)wasstudiedbyexperimentsandsimulations.TheLOPofGaN-basedLEDincreasesasthethicknessofpGaNlayerdecreasesfrom300nmto100nm,andthendecreasesasthethicknessdecreasesto50nm.TheLOPofLEDwith100-nm-thickpGaNincreasesby30.9%comparedwiththatoftheconventionalLEDwith300-nm-thickpGaN.ThevariationtrendofIQEissimilartothatofLOPasthedecreaseofGaNthickness.ThesimulationresultsdemonstratethatthehigherlightefficiencyofLEDwith100-nm-thickpGaNisascribedtotheimprovementsofthecarrierconcentrationsandrecombinationrates.
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