简介:Inthispaper,aneffectiveandrobustactivespeechdetectionmethodisproposedbasedonthe1/fprocesstechniqueforsignalsundernon-stationarynoisyenvironments.TheGaussian1/fprocess,amathematicalmodelforstatisticallyself-similarradomprocessesbasedonfractals,isselectedtomodelthespeechandthebackgroundnoise.AnoptimalBayesiantwo-classclassifierisdevelopedtodiscriminatethembytheir1/fwaveletcoefficientswithKarhunen-Loeve-typeproperties.Multipletemplatesaretrainedforthespeechsignal,andtheparametersofthebackgroundnoisecanbedynamicallyadaptedinruntimetomodelthevariationofboththespeechandthenoise.Inourexperiments,a10-minutelongspeechwithdifferenttypesofnoisesrangingfrom20dBto5dBistestedusingthisnewdetectionmethod.Ahighperformancewithover90%detectionaccuracyisachievedwhenaverageSNRisabout10dB.
简介:AnewmethodforintrinsicterminatorpredictionbasedonRnall,anRNAlocalsecondarystructurepredictionalgorithmdevelopedrecently,andtwoU-tailscoreschemasaredeveloped.Byoptimizingthreeparameters(thermodynamicenergyofRNAhairpinstructure,U-tailTweight,andU-tailhybridizationenergy),themethodcanrecognize92.25%ofknownterminatorswhilerejecting98.48%ofpredictedRNAlocalsecondarystructuresincodingregions(negativecontrol)asfalseintrinsicterminatorsinE.coll.ThismethodwasappliedtoscanthegenomeofSynechocgccussp.WH8102,andwepredicted266intrinsicterminators,whichincluded232protein-codinggenes,12tRNAgenes,and3rRNAgenes.About17%oftheseterminatorsarelocatedattheendofoperons.Itisalsoidentified8pairsofbiodirectionalterminators.ThemethodforintrinsicterminatorpredictionhasbeenincorporatedintoRnM1,whichisavailableathttp://digbio.missouri.edu/-wanx/Rnall/.
简介:富士Z系列轻薄卡片机凭借着富士的超级CCD感光器和富士珑镜头这两大特点和优势,获得了众多时尚消费者的喜爱。近日富士公司又发布了一款Z系列的新品FinePixZ5fd,它不但拥有以上两项技术,还加入了富士深入开发的脸部优先拍摄功能及双重防抖功能,由此而拥有过人的魅力。首先了解一下Z5fd的配置,这款机器支持USB2.0,内置26MB闪存,使用xD卡作为存储介质。该机内置了红外接口,具有4Mbps的传输速度。使用锂电池供电,按照CIPA标准可以拍摄大约200张图片,92.8×55.0×19.4mm的体积,148g的重量。机背上装置的是一块2.5英寸23万像素的LCD屏幕,图像效果相当不错。
简介:<正>TCLL52H78F是TCLH78系列液晶电视中的一款52英寸大屏产品,72mm的超薄机身设计,更能符合时尚家居生活理念。采用了自然光技术、动态背光技术以及附加圆偏振片,大幅提升电视画面的质量。TCLL52H78F的参数:屏幕尺寸:52英寸屏幕比例:16:9最佳分辨率:1920×1080亮度:500cd/m~2对比度:10000:1(动态)响应时间:4ms垂直可视角度:178°水平可视角度:178°机身尺寸:1308×886×269mm机身重量:40Kg产品功耗:320W输入端子:TV端子×2、AV端子×3、S端子×1、VGA输入×1、HDHI输入×2、分量输入×1其他性能DDH3数字动态全高清芯片、超高色温驱动、画面比例调节、主动数字背光调节、蓝晶彩屏技术、画厅提升技术、MEMC、全景显示、DDAS数字动态声谷、独守四驱音响