Radar Emitter Signal Recognition Based on Complexity Features

Intra-pulse characteristics of different radar emitter signals reflect on signal waveform by way of changing frequency, phase and amplitude. A novel approach was proposed to extract complexity features of radar emitter signals in a wide range of signal-to-noise ratio ( SNR), and radial basis probability neural network (RBPNN) was used to recognize different radar emitter signals. Complexity features, including Lempel-Ziv complexity (LZC) and correlation dimension (CD), can measure the complexity and irregularity of signals, which mirrors the intra-pulse modulation laws of radar emitter signals. In an experiment, LZC and CD features of 10 typical radar emitter signals were extracted and RBPNN was applied to identify the 10 radar emitter signals. Simulation results show that the proposed approach is effective and has good application values because average accurate recognition rate is high when SNR varies in a wide range.     

THE APPLICATION OF STATISTICAL PARAMETERS OF PHASE RESOLVED PD DISTRIBUTION TO AGING EXTENT ASSESSMENT OF LARGE GENERATOR INSULATION

Agingextentassessmentofgeneratorinsulationisofgreatsignificanceinplanninganeffectiveout ageandmaintenance .Inthelastdecade ,agingex tentassessmentoflargegeneratorinsulationwasasubjectresearchedintensively[1-4] .Anumberofpa pershavebeenpublishedonthetechniquesofinsu lationconditiondiagnosisandagingextentassess mentofgeneratorinsulation .Nearlyalleffortsforinsulationdiagnosisandagingassessmenthavereliedonelectricalmeasurementsandmostattentionhasbeenpaidtoanalysisofcharacteristicsofpartialdis cha…     

A MIXED LUBRICATION MODEL MODIFIED BY SURFACES'''' FRACTAL CHARACTERISTICS

Since 1978,theaverageflowlubricationmod el,i .e .Patir Chengequation[1] ,hasbeenwidelyusedinsolvingforthelubrication problemofabearingandthetribology systeminacylinder pis ton .However ,valuesoftheflowfactorsintheequation ,suchaspressureflowfactor ,aremeasuredonthebaseofroughness ,whichisvariablewithmeasuringscale .Since 1980s ,fractalgeometryhasgreatlydeveloped .Fractalistheintrinsicandglobalpropertiesofthematerialismwithfractalandinde pendentofameasuringscale .Also ,itwasverifiedthatsomemac…     

ANTITUMOR MECHANISM OF GEM10 BY THE NATURAL KILLER ACTIVITY AND INTERLEUKIN-2 PRODUCTION

Studiesongermaniumcompoundsshowedthattheyhavemanybiologicaleffects ,suchasanti tu mor[1] ,improvingimmunity[2 ] ,reducingthecon centrationofbloodcholestrolandtrilycerides[3] ,in hibitingvirusreproduction ,butthesideeffectsoftoxicrestricttheirclinicaluses[4 ,5] .Therefore ,itisstillnecessarytodevelopothernewcompoundsoforganogermaniums.GeM 10 ,aneworganicgerma niumcompounds alkili metalcomplexcombinedwitheffectiveextractsofsomeChinesetraditionalherbs ,hasbeendemonstratedtobesaferandmorereliable.…     

Distributed Broker-Agent Architecture for Multimedia Communications Traversing NAT／Firewall in NGN

The forthcoming Next Generation Network (NGN) is an all IP network. Multimedia communications over IP networks are a type of bundled session communications, which cannot directly traverse Network Address Translations (NATs) and firewalls even in NGN. To solve the problem that the existing traversal methods are not suitable for service providers to set up a real system in NGN,a Distributed Broker-agent Architecture (DBA) is addressed. DBA is secure and realizable for service providers and enterprises because it is easy to set up and does not need to upgrade the existing devices like Firewalls, NATs or endpoint devices of subscribers.DBA is composed of two-layer distributed agents, the server proxies and the client agents, in which all multimedia communications use shared tunnels to carry signaling messages and media data between broker-agents, and the call signaling is encrypted over Security Socket Layer (SSL) to guarantee the security of calling. Moreover, the function model and multiplexed connection messages format of DBA are designed, which lays a basis for the protocol in the future NGN. In addition, a simple implementation based on H.323 verifyies the main function of traversing firewalls and NATs.     

基于B—P神经网络的混凝土软化模型

本文探讨应用神经网络技术模拟材料本构行为的若干问题，并用Ｂ－Ｐ神经网络建立开裂混凝土的软化模型。     

On a Fast P-ary m-Sequence Transform

m-sequences have been used widely in many applications,but the corresponding computation of the correlation-detection is overwhelming N^2 operations,where N is the length of the m-sequence,such that it is unpractical. In this paper,a transform from p-ary m-sequence matrices to generalized Hadamard Matrices is developed;and then by the fast generalized Hadamard matrices transform,a fast p-ary m-sequence transform is developed.The results show that the computation can be dramatically reduced from N^2 to NlogpN operations,so the fast p-ary m-sequence transform could enable a rapid correlation-detection at the receiver.     

FABRICATION AND CHARACTERATION OF NANOPOROUS SILICA FILM

Microporoussilicafilmswithspecialpropertiesareexpectedtobeusedinmanyfields,suchasopticalcoat ing[1 ] ,sensor,membrance[2 ] ,anddielectricfilm[3 ] .Itslowsoundspeedandacousticdelayorhigherratiosoundinsulatingmaybeusedasultrasounddetector[4] .Theexcellentfeaturesofinsulatingpropertyanditsnearper fectinterfaceonsiliconcouldplayakeyroleinsuccessofverylargescaleintegrated(VLSI)devices[5\〗,etc.Intheotheraspects,nanoporoussilicafilmsarebeingusedinseparationtechnology[6] ,molecularengineering,andbi…     

STUDIES ON BLOOD GLUTATHIONE PEROXIDASE PROTEIN LEVEL OF CHILDREN IN KESHAN DISEASE AND KASHIN-BECK DISEASE AREAS

Ｋｅｓｈａｎｄｉｓｅａｓｅ (ＫＤ) ,ａｎｅｎｄｅｍｉｃｃａｒｄｉｏｍｙｏ ｐａｔｈｙ ,ａｎｄＫａｓｈｉｎ Ｂｅｃｋｄｉｓｅａｓｅ (ＫＢＤ) ,ａｎｅｎｄｅｍｉｃｄｅｆｏｒｍａｔｉｖｅｏｓｔｅｏａｒｔｈｒｏｐａｔｈｙ ,ａｒｅｔｗｏｉｎｄｅｐｅｎｄｅｎｔｄｉｓｅａｓｅｓｗｉｔｈｕｎｋｎｏｗｎｃａｕｓｅ .ＰｒｅｖｉｏｕｓｓｔｕｄｉｅｓｈａｖｅｉｎｄｉｃａｔｅｄｔｈａｔｔｈｅｂｌｏｏｄＳｅｃｏｎｔｅｎｔａｎｄＧＳＨ Ｐｘａｃ ｔｉｖｉｔｙｏｆｒｅｓｉｄｅｎｔｓｉｎｔｈｅｅｎｄｅｍｉｃａｒｅａｓｏｆｂｏｔｈｄｉｓ…     

A STUDY OF HIGH FRAME RATE ULTRASONIC IMAGING WITH LIMITED DIFFRACTION BEAMS

ThepioneeringworkofBrittingham[1] suggest edthe possibilityofsolutionstoMaxwell’sequationsdescribinglocalizednondispersivetransferofelectromagneticenergyinspace .Theoriginallyproposedsolutions ,termedfocuswavemodes(FWMs) ,werecontinuousandnonsingular ,hadathree dimensionalpulsestructure ,werenondisper siveforalltime ,andpropagatedatlightvelocityinstraightlines .Torendertheenergycontentofthosesolutionsfinite ,Brittinghamintroducedtwosurfac esofdiscontinuityinfinitelyextendedalongthedi rectio…