简介:瞄准充分利用类似物到当保留山峰平均比率(同等)时,没有oversaturation,digitalizing咬了的数字变换器(模数转换器)稳定,这份报纸提出一新分割完整数字(SFD)为新长期的进化(LTE)的自动获得控制(自动增益控制)算法通讯系统。分割的数字获得控制策略被采用基于检测力量地位由仅仅一步调整获得。要调整的获得需要是否由当前的信号状态被决定,源于输入信号和目标信号的邻近的根平均数平方(RMS)的变化范围。实现的软件模拟和硬件与LTE频率分割被进行了双(软式磁碟机)uplink信号和结果显示建议自动增益控制算法能精确地判定力量地位并且进一步,因此与短延期在一步精确调整获得没有oversaturation,它能象使同等稳定一样充分利用模数转换器digitalizing小点。另外,吝啬的错误向量大小(EVM)被限制不到1.6%投射遇见第三产生合伙(3GPP)标准很好。
简介:Variousindexstructureshaverecentlybeenproposedtofacilitatehigh-dimensionalKNNqueries,amongwhichthetechniquesofapproximatevectorpresentationandone-dimensional(1D)transformationcanbreakthecurseofdimensionality.Basedonthetwotechniquesabove,anovelhigh-dimensionalindexisproposed,calledBit-codeandDistancebasedindex(BD).BDisbasedonaspecialpartitioningstrategywhichisoptimizedforhigh-dimensionaldata.Bythedefinitionsofbitcodeandtransformationfunction,ahigh-dimensionalvectorcanbefirstapproximatelyrepresentedandthentransformedintoa1Dvector,thekeymanagedbyaB+-tree.AnewKNNsearchalgorithmisalsoproposedthatexploitsthebitcodeanddistancetoprunethesearchspacemoreeffectively.ResultsofextensiveexperimentsusingbothsyntheticandrealdatademonstratedthatBDout-performstheexistingindexstructuresforKNNsearchinhigh-dimensionalspaces.
简介:在环境保护观念普及化的今天,国际投资协定(BIT)将环境问题纳入规范之列,已成犬势所趋。美国正是在此背景下在其新版BIT中强化了环境保护。强化主要表现为用语、款项变化和内容增加,但却因专门环境条款用语仍极富弹性、缺乏法律责任规定和没有争议解决的法律机制作为实施保障,而表现出很强的政策属性,其法律意义因而打折。然而,因为一系列“强化”反映出向法律性质的靠近,法律意义并非阚如。对于美国来说,这种从政策性向法律性过渡的选择是现实需要与摆脱两难处境的折衷做法。正在与美国加紧谈判BIT的中国,应该在了解其内容、性质和发展趋势基础上,积极参与这类国际规则的制订过程。
简介:Inthispaper,weproposeoptimumandsub-optimumresourceallocationandopportunisticschedulingsolutionsfororthogonalfrequencydivisionmultipleaccess(OFDMA)-basedmulticellularsystems.Theapplicability,complexity,andperformanceoftheproposedalgorithmsareanalyzedandnumericallyevaluated.Intheinitialsetup,thefractionalfrequencyreuse(FFR)techniqueforinter-cellinterferencecancellationisappliedtoclassifytheusersintotwogroups,namelyinteriorandexteriorusers.Adaptivemodulationisthenemployedaccordingtothechannelstateinformation(CSI)ofeachusertomeetthesymbolerrorrate(SER)requirement.Therethen,wedevelopsubcarrier-and-bitallocationmethod,whichmaximizesthetotalsystemthroughputsubjecttotheconstraintsthateachuserhasaminimumdataraterequirement.Thealgorithmtoachievetheoptimumsolutionrequireshighcomputationalcomplexitywhichhindersitfrompracticability.Towardthisend,weproposeasuboptimummethodwiththecomplexityextensivelyreducedtotheorderofO(NK),whereNandKdenotethetotalnumberofsubcarriersandusers,respectively.Numericalresultsshowthattheproposedalgorithmapproachestheoptimumsolution,yetitenjoysthefeaturesofsimplicity,dynamiccellconfiguration,adaptivesubcarrier-and-bitallocation,andspectralefficiency.IndexTermsAdaptivemodulation,fractionalfrequencyreuse,multiusersubcarrier-and-bitallocation,opportunisticscheduling,orthogonalfrequencydivisionmultipleaccess.
简介:Theconceptofdualimagereversibledatahiding(DIRDH)isthetechniquethatcanproducetwocamouflageimagesafterembeddingsecretdataintooneoriginalimage.Moreover,notonlycanthesecretdatabeextractedfromtwocamouflageimagesbutalsotheoriginalimagecanberecovered.Toachievehighimagequality,Luetal.'smethodappliedleast-significant-bit(LSB)matchingrevisitedtoDIRDH.Inordertofurtherimprovetheimagequality,theproposedmethodmodifiesLSBmatchingrevisitedrulesandappliesthemtoDIRDH.Accordingtotheexperimentalresults,theimagequalityoftheproposedmethodisbetterthanthatofLuetal.'smethod.
简介:Asymmetricstereoscopicvideocodingcantakeadvantageofbinocularsuppressioninhumanvisionbyrepresentingoneofthetwoviewsinlowerquality.Thispaperproposesabitallocationstrategyforasymmetricstereoscopicvideocoding.Inordertoimprovetheaccuracyofbitallocationandratecontrolintheleftview,aproportionalintegral-derivativecontrollerisadopted.Meanwhile,tocontrolthequalityfluctuationbetweenconsecutiveframesoftheleftview,aqualitycontrollerisadopted.Besides,afuzzycontrollerisproposedtocontrolthevariationinqualitybetweentheleftandrightviewsbycomparingthePSNRdisparityoftwoviewswithafixedthreshold,whichisusedtoquantizethebinocularpsycho-visualredundancyandadjustthequantizationparameter(QP)oftherightviewcorrespondingly.TheproposedalgorithmhasbeenimplementedinH.264/AVCvideocodec,andtheexperimentalresultsshowitseffectivenessinratecontrolwhilekeepingagoodqualityfortheleftview,andfewerbitsareallocatedfortherightviewsothattheoverallbitrateissavedby7.2%atmostwithoutthelossofsubjectivevisualqualityforstereoscopicvideo.
简介:建立了高效液相色谱法测定杀菌防腐剂BIT(1,2-苯并异噻唑啉-3-酮)含量的方法。采用KromasilC18色谱柱(250×4.6mm),流动相为甲醇-含0.5mol/L磷酸二氢钾的水溶液(体积比为1:1);流速为0.6mL/min;紫外检测波长为225nm;外标法定量。样品的平均加标回收率为99.5%-100.10%,相对标准偏差(RSD)为0.20%—0.86%,检出限为0.01mg/kg(S/N=-3)。
简介:Thestructureoftheopticalwaveguideof2-bitelectroopticA/Dconverterwithproton-exchangemicroprismsisoptimizedbythefinite-differencebeampropagationmethod(FD-BPM).Theelectrodeparametersoftheconverterareoptimizedbyconformalmapping.Theoptimalparametersareahalf-wavevoltageofVπ=4.5VandabandwidthofΔf=1.4GHz.Anormalizedtransmittedpowerof69.75%isobtainedbyFD-BMPandtheoutputwaveguidegapis300μm.