最新刊期
卷 ， 期 5 ， 1987
- 摘要：A new approach for printed Chinese character recognition is presented in this paper. According to the structure of Chinese characters, a set of structural characteristics （peripheral feature, local patterns, end points and cross points of strokes） is defined and used for pre-classification and matching.An experimental recognition system has been developed for recognizing 6763 different printed Chinese characters. Experiment shows that the correct recognition rate is better than 98%.2|124|8更新时间：2025-12-08
- 摘要：The concept and Algorithm SSTDKTP of the state space tree T of the directed ?tree polynomial P On, ....., FK) of a composite graph G are introduced. Then a new algorithm- Algorithm DKTPCG is presented for the direct generation of P（tF1, FK） using branch-and-bound method. The algorithm is simple, and the resulting expression is very com pact. The computing time complexity is O（men1）. The space complexity is O[（n-k）（ke+ n）] for stacks and O（ndf） for output arrays XE, YE, FL and NS, where n, and ndf, are the numbers of leaf and state nodes of T, respectively.4|29|6更新时间：2025-12-08
- 摘要：In this article, the universal constructions, limitations and conditions for realization of earthed and floatingearthed active simulated universal components are discussed. It is shown by the experiments tha the theory is in conformity with the practice. Finally, the effect on the bandpass characteristics of the filter aroused on account of the limitation suf- fered by the gain band width of the operational amplifier is calculated and compared through designing five kind of third order ellipse low pass filter, and it is further illustrated that a twin secondary optimum structure can be obtained by means of this research.2|94|5更新时间：2025-12-08
- 摘要：<正> 中国中文信息学会与中国国际科技会议中心于1987年8月4日至7日在北京召开了中文信息处理国际会议,中国中文信息学会理事长钱伟长教授致开幕词。来自澳大利亚、比利时、加拿大、法国、卢森堡、日本、新西兰、新加坡、南斯拉夫、美国、2|17|0更新时间：2025-12-08
- 摘要：In this paper, the expressions of the input impedance for a probe type coaxial line-rectangular waveguide transducer are derived by means of self-reaction of an assumed current over the probe. The experimental results are compared with theoretical calculation.2|286|2更新时间：2025-12-08
- 摘要：The electromagnetic field distribution in a cylindric cavity with an axial magnetized plasma and the characterstic equation are derived in terms of tensor electrodynamics. The relationship between the resonance frequencies and the density of the plasma is analysed numerically and the qualitative comparison is made with the measured value of a gyromonotron.4|24|0更新时间：2025-12-08
- 摘要：A new generalized function is suggested which contains two independent parameters. It has a variety of distribution curves （saddle, single peak, pattern with side lobe）. By using the generalized function in the linear array synthesis the direction diagram with approximate flat top in wide angle region and with or without a single side lobe can be obtained.2|22|0更新时间：2025-12-08
- 摘要：The microwave cavity with cylindrical symmetry and complicated geometry shapes at the longitudinal section are studied by finite elenemt method. The resonant frequency and unload quality factor are calculated accurately and the program with FORTRAN language is worked out. The calculated results of six section uniform cavities are compared with the cold test measurements, the error is less than 0.035%.2|104|3更新时间：2025-12-08
- 摘要：The experiment and theorical analysis of a new type transistor-Channel Base Transistor （CBT） is presented. In principle, the bipolar content and the normally-off JF-ET content are contained simultaneously in CBT. Its important advantages are the small variations of current gain with temperature and small variations of current gain in small current region with emitter current compared with bipolars.2|21|1更新时间：2025-12-08
- 摘要：The internal relations between the failure mechanism of TV-tube’s cathode and acceleration model （Arrhenius equation） are explored by means of "simulated acceleration" and "spot analysis" in the AES chamber. The results show that the exponential factor E of acceleration equation represents the "apparent activation energy" of Ba; the accelerated life is largely confined by evaporation of Ba on the surface of cathode; the accelerated life test with greater acceleration ratio is feasible.2|22|0更新时间：2025-12-08
- 摘要：The characteristics of PN sequences are discussed based on the results obtained in recent years. A conjecture that the binary sequences which reach the Baumert-Wang-Wel-ch’s lower bounds are the complete set of binary PN sequences is proposed. Further, an approach for generating the non-linear M-sequences through some specific transformations over GF （p） is given. Finally, some primitive results about the Gold-like sequences over GF（p） are presented and these sequences may be applied to the p-ary channels as a new class of CDMA cades.2|124|1更新时间：2025-12-08
- 摘要：<正> 中国科协科技咨询服务中心最近在北京召开了“福建省永安市和新疆吉木萨尔县综合发展规划全国专家评审会,并通过了评审。 这项工作依靠北京师范大学模糊数学学者汪培庄教授领导的一支跨学科跨系统的横向联系的学术力量,在中国电子学会科技咨询服务中心的支持和组织下并与永安市、吉木萨尔县的领导和专家合作下,以当地专家为主,共同制定了本地区综合发展规划,并将模糊数学方2|12|0更新时间：2025-12-08
- 摘要：The purpose of this paper is 1) to propose a Kalman-filtering-formula based ARMA spectral estimator capable of estimating spectra on line, 2)to consider a fast algorithm for recursively calculating the Kalman gain whose computational requirement is proportional to the order of the filter, and 3) to give a consistency theorem for this recursive estimator.Compared with recently developed ARMA spectral estimation approaches--the overdeterminedequation method and the instrumental variable method, this estimator has advantages that the positivity of estimated spectra can be warranteed and parameters of ARMA processes can be identified in real time. Numerical examples show that this estimator provides higher resolution than AR spectral estimation.2|97|1更新时间：2025-12-08
- 摘要：A memoryless grouped-data robust sequential detection procedure is proposed. Its robustness including false alarm probability, detection probability and average sample number is demonstrated and its asymptotic performance is discussed. Finally, the performance curves in small sample sizes are given for the p-point distribution class. The detector exhibits simplicity in structure and retains sample-efficiency of sequential detector.2|50|1更新时间：2025-12-08
- 摘要：A new method of the fault diagnosis of nonlinear circuits--the quasi-faultincremental circuit approach is given. This method has a wide range of application. To diagnose the multiple faults in nonlinear circuits by using the method only deals with the linear diagnosis equation and requires small after-test computation. Two examples are also presented to verify the rightness and effectiveness of the method proposed.2|42|13更新时间：2025-12-08
- 摘要：Some recent achievements and new research directions in cryptography are reviewed briefly. In which two kinds of contemporary developments, the one-way cryptosystems and two-way cryptosystems, are laid emphasis upon.2|506|13更新时间：2025-12-08
- 摘要：Based on the spectral techniques of digital [network system, two necessary and sufficient conditions of judging the self-duality of a linear code are presented.2|23|1更新时间：2025-12-08
- 摘要：An effiient and well-structured algorithm is presented for the computation of all four types of the radix -2 discrete W transform （DWT）. The computational requirements for the type I of the dis-crete W transform （DWT-I, also called the discrete Hartley transform, DHT）are N/2（log,N-3）+2 multiplications and N/2（3 log2N-5）+6 additions. That is more efficient than other any existing algorithm for the DWT-I or DHT.2|44|6更新时间：2025-12-08
- 摘要：The static and dynamic characteristics of the magnetic head in 5.25" Winchester disk have been studied. Partial paramenters of the disk in the international standards are demonstrated theoretically and the head take off speed Uf is explained. The four dynamic parameters of the flying mechanism have been optimized in order to minimize the variation of the head flying height.2|20|0更新时间：2025-12-08
- 摘要：A coherent optical fiber communication system （0.633μm wavelength） is introduced. This system employs two stabilized lasers working independently, and can tune intermediate frequency （from about 400MHz to 2MHz） arbitrarily. Until now, the coherent optical fiber system which can tune I. F. arbitrarily is not reported yet. With this system selecting I. F. as 70MHz and 30MHz an experiment in transmitting code signals is made, the result is very satisfactory. In our country this is the first experimental system in this field.2|64|0更新时间：2025-12-08
- 摘要：An active filter with both LP and HP functions is derived. The conclusion which is not sensitive to the changes of the value of each component is drawn. The formula and the necessary condition for component design in the circuit are given. Finally, the correctness of theoretical analysis is verified through experiments.2|37|0更新时间：2025-12-08
- 摘要：On the basis ot reference [1]. The adaptive performances of DSTLMS algorithm are analyzed. The reason why DSTLMS algorithm has an advantage over conventional LMS algorithm and the application of DSTLMS algorithm to filtering are discussed.2|48|0更新时间：2025-12-08
- 摘要：An algorithm of macrosimulation suitable for microcomputer implementation is presented in this paper. It is a modified WRM （waveform relaxation method） with significant saving both in storage and computing time. Many satisfactory results have been achieved through checking some circuits.2|13|0更新时间：2025-12-08
- 摘要：A new type of DM digital recursive filter which is implemented with improved DDA integrators and DDA sealers is presented. The first and second order filters implemented with DDA devices with second order residue retention and their cascading are discussed. Finally, the results are compared with those of the DM digital recursive filters with other structures. All results are verified by computer simulation.2|20|0更新时间：2025-12-08
- 摘要：The structure, theoretical design and experimental results of Marx generator used for 1011 W intense electron beam accelerator system are described. The results are in good agreement with experimental measurement. The stable and reliable performances of the generator have been shown.2|139|3更新时间：2025-12-08
- 摘要：Based on the z-domain equivalent circuit for a capacitor element in the switched-capacitor networks, a HSPICE model for a capacitor element is presented. Owing to the establishment of HSPICE subcircuits consisting of the transformer unit and the differential delay unit, the description for the model is simplified. According to this model, a practical network is analyzed.2|123|1更新时间：2025-12-08
- 摘要：An uniqueness theorem for additive decomposition of binary-complex-variable functions is prasented, and the problem of scattering of electric polarized waves by a dielectric wedge with arbitrary angle is solved. A formula of multiplicative strangeness decomposition to a form suitable for computation is reduced.2|30|0更新时间：2025-12-08
- 摘要：The EM responses of 2-layer conducting medium from dipole antenna of finite length excitation are studied by means of the complex image theory and GOA. Therefore the evaluation of Somm-erfeld integrals is avoided and the computing time is reduced. The calculating results agree with experimental values.2|25|1更新时间：2025-12-08
- 摘要：It is pointed out that the problem, presented by[1], on the restraint condition under which a scattering matrix of an n-port lossy network exists is well solved and the main results on this area are expressed.2|49|3更新时间：2025-12-08
- 摘要：<正> 《有耗网络S参数相角关系不等式》一文发表之后,作者得到两种不同的信息。有的认为这一工作尚有待进一步挖掘,而另一种意见则认为W.K.Chen著作中所列条件业已充要,不会再有其它约束。这里发表注记的作者朱义胜同志即持此种观点。3|46|2更新时间：2025-12-08
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