最新刊期
卷 ， 期 4 ， 1987
- 摘要：The Chinese speech understanding system BJD-I with dialogue capability used for railway reservation and query service consists of three parts: （1）Speech Acoustic Processor （2）Linguistic Processor,（3）Voice Response Processor.In the,speech acoustic processor,two algorithms are proposed.One is for voice detection and syllable separation of continuous speech by maximum formant（MFDS）.The another is for Fast Speed Dynamic Programming matching of patterns （FSDP）.The experiments show that the correct rate of syllable separating for continuonus speech by MFDS is above 98%.By using FSDP algorithm,the recognition accuracy is as same as the optimized dynamic programming presented by Sako,but the pattern matching speed is above twice faster.In the linguistic processor,a grammar model RSNG （Regular Semantic Network Grammar） for syntax analysis and a knowledge representation method called tree-structure knowledge representation are set up.The performance of BJD-I Chinese speech understanding system has been tested by a man speaker and the experiment resultes show that the correct rate of semantic entry recognition is 80% and the 98% of service was well completed.2|16|1更新时间：2025-12-08
- 摘要：A contour-based approach to motion analysis is introduced.It is based on firstly calculating the motion at image corners,and then propagating the corner motion estimates along the principal contours in the image based on a local 21/2 Dmotion assumption by the dynamic programming.The results of several experiments show that the optical flow field is globally consistent with the principal contours.2|30|1更新时间：2025-12-08
- 摘要：A comprehensive analysis concerning the calculations of DC Characteristics,microwave and noise parameters of HEMT is given.A modified charge-control model taking account of the effects of nsεF dependence is utilized.The DC characteristics are calculated by using saturation model with a minor modification when negative mobility model involved.Analytical formulas for M-W behaviors and intrinsic noise parameters are derived,and the Fukui coefficient obtained KF is 5070% smaller than that of GaAs MESFET.2|73|0更新时间：2025-12-08
- 摘要：The relationship among the normalized cut-off frequency,normalized propagation constant,dispersion and power distribution of triangular-core doubly clad single-mode fibers and the inner cladding parameters has been studied in detail.And the universal curves for their general relations are given.2|33|0更新时间：2025-12-08
- 摘要：The dependence of the microstructure and phase composition of the conventional sintered,hot-pressed （HP） and hot isostatic pressed （HIP） ferrites on the bending strength σ（?） vickers hardness Hv and coefficient of thermal expansion has been studied,its mechanism has also been discussed.The results show that HIP ferrites have an improved mechanical properties and such ferrites are very good magnetic head materials for high density recording.2|68|1更新时间：2025-12-08
- 摘要：A new concept,s-order even term signal,is proposed and its properties are discussed.The relationship between cepstrum and s-order even term signal of a signal is given.When a signal is finite,the expression of the Z transform of its s-order even term signal is derived.When signal is perioic,the relationship between its s-order even term signal and its discrete Fourier transform is obtained.Finally,the least square even term decon-volution method is presented.2|29|7更新时间：2025-12-08
- 摘要：a new gas-sampling technique for long-term （lifetime） mass-spectrometric analysis of sealed gas lasers is presented.Using a self-made new valve-ultramini-flow valve of planar type-and a quadrupole mass spectrometric system,the authors investigated the lifetime process of a CO2 gas laser and discovered some meaningful phenomena.It is pointed out that the adpsortion of gas due to the sputtering of the cathode material is the main reason for the failure of laser tube.2|11|0更新时间：2025-12-08
- 摘要：A test generation algorithm for stuck-open faults in CMOS combinational circuits is presented.An initializing input pattern T1 and a test input pattern T2 can be generated at the same time.It is shown that the test （T1,T2） generated using the algorithm is a robust test.2|23|0更新时间：2025-12-08
- 摘要：This paper deals with the method of optimal design by means of orthogonal array table for prameters of electronic circuit.The following problems are studied: Orthofonal array table and its properties;Direct optimal method;Optimal design for stability;Tolerance design;Reliable design.2|33|3更新时间：2025-12-08
- 摘要：The grain boundary structure of polycrystalline films of multialkli photocathodes is discussed.The conduction model of muhialkali photocathodes is proposed and the conductivity expression is derived.The theoretical curves of lnσ-l/T show good agreement with the experimental results.The experimental phenomenon on that the curves of lnσ-l/T of multial-kali photocathodes are composed of two or three straight lines is explained,and the idea that the three straight lines may transform into two straight lines is proved in experiment.2|24|2更新时间：2025-12-08
- 摘要：<正> 第四届回旋管及自由电子激光国际讨论会于1987年6月1日至6月5日在成都电讯工程学院召开。成都电讯工程学院院长刘盛纲教授和美国能源部T.V.乔治博士任大会主席。来自美国、英国、苏联、德意志联邦共和国、法国、日本等国家的30多名专家和80多名中国专家共聚一堂,进行了广泛的学术交流。 回旋管和自由电子激光是近十年发展起来的新兴的高技术学科,引起了各国科学家的高度重视。世界上许多发达国家都投入了大量的人力、物力积极开展此项研究工作。2|17|0更新时间：2025-12-08
- 摘要：The phase noise spectrum and linewidth of coupled-cavity semiconductor lasers are given for the first time.The lower phase noise in coupled-cavity semiconductor lasers is attributed to optical feedback and injection locking.2|68|18更新时间：2025-12-08
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The Modified Multilevel Newton Algorithm for the Analysis of Large Scale Circuits in the Time Domain
摘要：Rabbat,Sangiovanni and Hsieh proposed a Multilevel Newton Algorithm （MLNA） for analysis of large scale nonlinear circuits in the time domain.In this parper two techniques of improving MLNA are presented: 1.Using terminal voltage of subnetwork as stimuli of the subnetwork.2.Evaluating the subnetwork contribution in Jacobian matrix by analysing the sensitivity network.The proposed techniques considerably save the time for establishing jacobian matrix.2|17|0更新时间：2025-12-08 - 摘要：The S-parameters of symmetric stripline T-junction are studied by using of the concept of equivalent parallel plane waveguide and the method of mode analysis.Under the condition of TEMtransmission,the theoretical formulas calculating T-junction S-matrix are obtained and the S-parameters are measured at 9.6 GHz.The theoretical results are basically in agreement with the experimental data,and quite consistent with the results obtained by the empiric formulas based on experimental data in the references.2|28|0更新时间：2025-12-08
- 摘要：A new estimation approach to the detection threshold in image matching is developed in this paper.A general theory and method for optimizaion of template matching and real-time estimation of optimal subtemplate is studied.By means of the density function fitting method of weighted sum of normal kernels the optimizing problem of template matching for non-normal distribution image is solved.2|198|6更新时间：2025-12-08
- 摘要：The Slotted Line Method-a novel method for measuring large signal S-para-meters is developed,which has great practicability and is accurate to some extent.Besides,it can be used both to measure the small signal S-parameters of active networks and the S-parameters of passive networks with high accuracy.2|56|2更新时间：2025-12-08
- 摘要：On the basis of discussion of the shortcomings of current TV systems,several representative TV systems of the coming generation are and summarized analysed.A "Compatible transition" way for the development of the terrestrial trasmission and satellite broadcasting in coordination is proposed in accordance with the situations of our country.2|17|1更新时间：2025-12-08
- 摘要：In this paper,the rate and distortion of vector quantization are discussed.It is proved that the minimum rate for encoding a source with munimum achievable distortion Dmin for a given number N of k-dimensional output codevectors is the output entropy of the optimal k-dimensional vector quantizer with codebook size N.It is also shown that for a codebook with symmetrical probability distribution,the output entropy of the vector quantizer will never be smaller than one bit per vector.Finally,a series of inequalities is derived,which gives a quantitative relation between the performance of a vector quantizer and rate-distortion function.2|38|0更新时间：2025-12-08
- 摘要：High-density residual defects induced by rapid thermal annealing during As+ implantation into Si through SiO2 and the influences of defects on As* enhanced diffusion are studied.The diffusion model is given,the conditions of preparing shallow p-n junction are obtained,and the 1000A p-n junction with high carrier concentration is made.2|11|2更新时间：2025-12-08
- 摘要：On the basis of the electron degradation,caused by the total x-ray dose absorbed by the SiO2 layer of backside-illminated device,the lifetime of EBS-CCD is calculated.The theoretical results are in good comformity with experiments.The effective lifetime for backside-illminated EBS-CCD is more than several kilohours,which may be confirmed in our accelerated lifetime experiments.2|34|1更新时间：2025-12-08
- 摘要：The theories of using multi-bands operation and extending bandwidths by use of the negative admittance region for corrugated conical horns are described in this paper.Practical corrugated conical horns are also presented.Comparision between calculated value and measured value shows that they are consistent with each other satisfactorily.2|45|0更新时间：2025-12-08
- 摘要：This paper describes the principle of FFT beam forming method and emphasizing necessity of focusing for spherical wavefronts at neear field.To meet the need of wide-range of data of focusing operation,a method of changing scale factor is proposed and implemented.Finally,the results of development are presented..2|173|0更新时间：2025-12-08
- 摘要：The capacitance characteristic formula of a nonlinear Capacitor is obtained by establishing the basic equation of a nonlinear circuit with pure capacitor,thereby deriving the characteristic equation of varactor diode and verifying the correctness of the formula obtained.4|244|8更新时间：2025-12-08
- 摘要：Observed data of HF radar section of rocket exhaust are given.An equivalent cone model is presented to compute the HF radar section of rocket exhaust,and the computed results from this model are in good agreement with the observed data.2|41|0更新时间：2025-12-08
- 摘要：A new two-dimension finite element analysis program SDA-I for semiconductor devices is presented.A more complete physical model of the device is adopted,and the sparse matrix technique of symbol Lu factorization,the self-adaptive finite element mesh refinement technique aed the modified nonlinear iteration technique are used in the numerical method.Thereby the speed of device analysis is increased con siderably.2|38|1更新时间：2025-12-08
- 摘要：A double correlation deep level transient spectroscopy （DDLTS） system equipped with a phase-sensitive-detector（PSD） rate windon has been presented.It is simple in structure,inexpensive in cost and convenient to operate as well.Especially,it has a better signal-to-noise ratio,so that a higher resolution for the analysis of deep level profiles can be expected.2|22|0更新时间：2025-12-08
- 摘要：In this paper fast algrithm of the discrete Hartley transform of length （pM-l） using subgroup convolutions is presented.Only real value arithmetic and real value storage of intermediate results are required to compute the discrete Fourier transform of real value squence using the new algorithm.2|46|3更新时间：2025-12-08
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