简介：Background:Dissociativeattentionalstimuli(e.g.,music,video)areeffectiveindecreasingratingsofperceivedexertion(RPE)duringlow-tomoderateintensityexercise,buthaveinconsistentresultsduringexerciseathigherintensity.ThepurposeofthisstudywastoassessattentionalfocusandRPEduringhigh-intensityexerciseasafunctionofbeingexposedtomusic,video,both(musicandvideo),orano-treatmentcontrolcondition.Methods:Duringthefirstsession,healthymen(n=15)completedamaximalfitnesstesttodeterminetheworkloadnecessaryforhigh-intensityexercise(operationalizedas125%ventilatorythreshold)tobeperformedduringsubsequentsessions.On4subsequentdays,theycompleted20minofhigh-intensityexerciseinano-treatmentcontrolconditionorwhilelisteningtomusic,watchingavideo,orboth.Attentionalfocus,RPE,heartrate,anddistancecoveredweremeasuredevery4minduringtheexercise.Results:MusicandvideoincombinationresultedinsignificantlylowerRPEacrosstime(partialη~2=0.36)andthesizeoftheeffectincreasedovertime(partialη~2=0.14).Additionally,musicandvideoincombinationresultedinasignificantlymoredissociativefocusthantheotherconditions(partialη~2=0.29).Conclusion:Musicandvideoincombinationmayresultinlowerperceivedexertionduringhigh-intensityexercisewhencomparedtomusicorvideoinisolation.Futureresearchwillbenecessarytotestifreductionsinperceivedexertioninresponsetodissociativeattentionalstimulihaveimplicationsforexerciseadherence.

简介：Objective:Theobjectiveofthecurrentstudywastoevaluatethefeasibilityandsafetyofnonintubateduniportalvideo-assistedthoracoscopicsurgery（VATS）forthemanagementofprimaryspontaneouspneumothorax（PSP）.Methods:FromNovember2011toJune2013,32consecutivepatientswithPSPweretreatedbynonintubateduniportalthoracoscopicbullectomyusingepiduralanaesthesiaandsedationwithoutendotrachealintubation.Anincision2cminlengthwasmadeatthe6thintercostalspaceinthemedianaxillaryline.Thepleuralspacewasenteredbybluntdissectionforplacementofasoftincisionprotector.Instrumentsweretheninsertedthroughtheincisionprotectortoperformthoracoscopicbullectomy.Datawerecollectedwithinaminimumfollow-upperiodof10months.Results:Theaveragetimeofsurgerywas49.0min（range,33-65min）.Nocomplicationswererecorded.Thepostoperativefeedingtimewas6h.Themeanpostoperativechesttubedrainageandhospitalstaywere19.3hand41.6h,respectively.Thepostoperativepainwasmildfor30patients（93.75%）andmoderatefortwopatients（6.25%）.Norecurrencesofpneumothoraxwereobservedatfollow-up.Conclusions:Theinitialresultsindicatedthatnonintubateduniportalvideo-assistedthoracoscopicoperationsarenotonlytechnicallyfeasible,butmayalsobeasafeandlessinvasivealternativeforselectpatientsinthemanagementofPSP.ThisisthefirstreporttoincludetheuseofanonintubateduniportaltechniqueinVATSforsuchalargenumberofPSPcases.Furtherworkanddevelopmentofinstrumentsareneededtodefinetheapplicationsandadvantagesofthistechnique.

简介：最近的研究证明了联机录像成像是为监视结晶化过程的一种很有希望的技术。当需要柔韧、快、有能力处理的图象分析由于操作象混合和稳固的集中那样的条件的时间的变化改变了图象质量，在为即时靠近环的控制使用这种技术的瓶颈被考虑。因为晶体趋于重叠或属于对方，在高固体的集中的图象分析结果极其挑战性，在晶体之间的边界通常是模糊的。这篇论文论述能有效地处理在高固体的集中拿的图象的一个图象分割算法。方法片断晶体在水晶块的轮廓上沿着主要相关的凹面点属于对方。详细过程在一个热阶段的反应堆用申请被介绍给l-glutamic酸的结晶化。

简介：ThenewH.264videocodingstandardachievessignificantlyhighercompressionperformancethanMPEG-2.AstheMPEG-2ispopularindigitalTV,DVD,etc.,bandwidthormemoryspacecanbesavedbytranscodingthosestreamsintoH.264intheseapplications.Unfortunately,thehugecomplexitykeepstranscodingfrombeingwidelyusedinpracticalapplications.Thispaperproposesanefficienttranscodingarchitecturewithasmartdownscalingdecoderandafastmodedecisionalgorithm.Usingtheproposedarchitecture,hugebufferingmemoryspaceissavedandthetranscodingcomplexityisreduced.Performanceoftheproposedfastmodedecisionalgorithmisvalidatedbyexperiments.

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简介：Videoobjectextractionisakeytechnologyincontent-basedvideocoding.AnovelvideoobjectextractingalgorithmbytwoDimensional(2-D)mesh-basedmotionanalysisisproposedinthispaper.Firstly,a2-Dmeshfittingtheoriginalframeimageisobtainedviafeaturedetectionalgorithm.Then,higherorderstatisticsmotionanalysisisappliedonthe2-Dmeshrepresentationtogetaninitialmotiondetectionmask.Afterpost-processing,thefinalsegmentingmaskisquicklyobtained.Andhencethevideoobjectiseffectivelyextracted.Experimentalresultsshowthattheproposedalgorithmcombinesthemeritsofmesh-basedsegmentingalgorithmsandpixel-basedsegmentingalgorithms,andherebyachievessatisfactorysubjectiveandobjectiveperformancewhiledramaticallyincreasingthesegmentingspeed.

简介：Physicalinactivityhasbeenidentifiedasoneoftheleadingcausesofmanychronicdiseasessuchascardiovasculardisease,type2diabetes,andobesity.Technologysuchasvideogamesplaysacomplicatedroleinphysicalinactivity—muchlikeadouble-edgedsword.Traditionally,videogameshavecontributedtotheepidemicofphysicalinactivityandhavebeen

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简介：与WiFi和3G/4G的快速的发展，人们趋于在移动设备上看录像。这些设备是无所不在的，但是有小存储器缓冲录像。作为结果，与传统的计算机相对照，这些设备加重内容供应商的网络压力。以前的研究使用CDN解决这个问题。但是它出租空间不能动态地在被调整的静态的租借机制让运作的费用高飞并且与不兼容动态地录像交货。在我们的学习，基于从Tencent录像的用户行为的彻底的分析，一个流行中国联机录像份额平台，我们识别二关键用户行为。第一，在一样的区域的大量用户趋于看一样的录像。第二，录像的流行分发符合Pareto原则，即，20%流行录像拥有的顶80%所有录像交通。把这些观察变成银子弹，我们在需求系统(CPA-VoD)上建议并且实现一个新奇帮助云、帮助同伴的录像。在系统，我们在象同伴群的一样的区域，并且在一样的同伴群组织用户，用户们能由分享他们的缓冲录像提供录像给另外的用户。而且，我们在云服务器缓冲10%很流行的录像进一步减轻网络压力。我们选择云服务者因为出租空间能动态地被调整，缓冲录像。根据从Tencent录像的真实数据集上的评估，CPA-VoD最优地减轻网络压力和操作费用，当仅仅20.9%交通被内容供应商满足时。

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简介：Inthiswork,anewmethodtodealwiththeunconnectedpixelsinmotioncompensatedtemporalfiltering(MCTF)ispresented,whichisdesignedtoimprovetheperformanceof3Dliftedwaveletcoding.Furthermore,multipledescriptionscalablecoding(MDSC)isinvestigated,andnovelMDSCschemesbasedon3Dwaveletcodingareproposed,usingtheliftingimplementationoftemporalfiltering.TheproposedMDSCschemescanavoidthemismatchprobleminmultipledescriptionvideocoding,andhavehighscalabilityandrobustnessofvideotransmission.Experimentalresultsshowedthattheproposedschemesarefeasibleandadequatelyeffective.

简介：InordertoimprovethevideotransmissionperformanceinMultiple-InputMultiple-OutputOrthogonalFrequencyDivisionMultiplexing(MIMO-OFDM)system,anewscheme,whichintegratesMultipleDescriptionCoding(MDC),LowDensityParityCheck(LDPC)codingandhybridspacetimecoding,isproposedinthisletter.Inparticular,ahybridspacetimecodingalgorithmiscombinedwithLDPCcodestoperformUnequalErrorProtection(UEP)ofMDCencodedvideostreams.ComparingwiththeUEPtransmissionwithonlyLDPCcodes,theproposedschemeachievesmorethan1dBgainintermsofSignaltoNoiseRatio(SNR)whenthePeakSignaltoNoiseRatio(PSNR)ofreconstructedvideoisabove30dB.

简介：ResearchdemonstratesthataFresnelhologramcanbegeneratedandsimultaneouslyencryptednumericallybasedonasecretsymmetrickeyformedbythemaximallengthsequence(M-sequence).Themethodcanbedirectlyextendedtoencryptavideoholographicclipinaframe-by-framemanner.However,giventhelimitedcombinationofsignalsinthefamilyofM-sequence,hackingthesecretkeythroughtrialanderrorcanbetimeconsumingbutnotdifficult.Inthisletter,weproposeamethodthatisdifficulttocrackwithbruteforceforencryptingaholographicvideosequence.AnM-sequenceisfirstrandomlyassignedtoencrypteachframeoftheholographicvideosignal.Subsequently,theindexoftheselectedM-sequence,whichisnecessarytodecryptthehologram,isencryptedwiththeRSAalgorithmbeforetransmittingtothereceivingend.Atthereceivingend,thedecoderisprovidedwithaprivatekeytorecovertheindexforeachframe,andthecorrespondingM-sequenceisusedtodecrypttheencodedhologram.

简介：摘要：新修订的《普通高中英语课程标准（2017年版）》（以下简称《新课标》）

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简介：Asymmetricstereoscopicvideocodingcantakeadvantageofbinocularsuppressioninhumanvisionbyrepresentingoneofthetwoviewsinlowerquality.Thispaperproposesabitallocationstrategyforasymmetricstereoscopicvideocoding.Inordertoimprovetheaccuracyofbitallocationandratecontrolintheleftview,aproportionalintegral-derivativecontrollerisadopted.Meanwhile,tocontrolthequalityfluctuationbetweenconsecutiveframesoftheleftview,aqualitycontrollerisadopted.Besides,afuzzycontrollerisproposedtocontrolthevariationinqualitybetweentheleftandrightviewsbycomparingthePSNRdisparityoftwoviewswithafixedthreshold,whichisusedtoquantizethebinocularpsycho-visualredundancyandadjustthequantizationparameter(QP)oftherightviewcorrespondingly.TheproposedalgorithmhasbeenimplementedinH.264/AVCvideocodec,andtheexperimentalresultsshowitseffectivenessinratecontrolwhilekeepingagoodqualityfortheleftview,andfewerbitsareallocatedfortherightviewsothattheoverallbitrateissavedby7.2%atmostwithoutthelossofsubjectivevisualqualityforstereoscopicvideo.