最新刊期
卷 ， 期 6 ， 1990
- 摘要：This paper focuses on the structure analysis and other properties of linear constant weight codes. It is proved that any linear constant weight code is weakly equivalent to the Walsh-Hadamard code.2|87|14更新时间：2025-12-08
- 摘要：A quasi-two dimentional analytical model of threshold voltage for non-uniform doped short channel MOSFET is presented in this paper. The threshold voltages of MOSFETs with micron and submicron channel length under different conditions are calculated by this model. The results are in good agreement with those obtained by the 2D numerical analysis program. This model is suitable for the circuit analysis program, process tolerant analysis and device design optimization.2|28|0更新时间：2025-12-08
- 摘要：The improved 2D ion implantation model, annealing model and oxygen ion implantation model are presented. On the basis of dealing with multi-layer mask, various mask materials and numerious mask edges, a multi-function 2D ion implantation simulator-FUTIS has been developed for VLSI processes. As compared with other process models, simulators and experiments, it is shown that the accuracy of FUTIS has been obviously improved and the function has been considerably extended. FUTIS is an advanced ion inplantation simulator which can fit for the development of the current VLSI processes.2|15|0更新时间：2025-12-08
- 摘要：A fast modelling method used to analyse DC to DC switching converters is presented in this paper. The state equation obtained from this new circuit model is just the same as that obtained from the state-space averaged method. Based on this new model, steady state DC analysis and small signal AC analysis can be used to analyse all kinds of converters. All of the results agree with those given by [1-3], but this method is simpler and better than the state-spaace averaged method accepted so far.2|83|2更新时间：2025-12-08
- 摘要：There are many achievements on code scheduling in scalar blocks[1,2,6,12], but they cannot be used in vector blocks because many dependences in vector blocks are different from those in scalar blocks. In this paper, after these dependences are analyzed in detail, an algorithm with an O（n*n） worst-case runtime for code scheduling in vector blocks has been presented and implemented in YH （Galaxy） supercomputer system. By using our scheduler, the object codes of a vectorized loop in a pipeline computer can be reordered in such a sequence that can make great use of the multi-functional pipelines and the chaining to exploit parallelism.2|15|1更新时间：2025-12-08
- 摘要：A bidirectionally heuristic graph search algorithm BFFRA* on random production system is proposed based on unidirectional heuristic graph search algorithm RA* on random production system and combined with bidirectionally heuristic graph search algorithms such as BHPA and BHFFA2. The admissibility of the algorithm is proved and some new ad-missibility results are obtained.2|136|4更新时间：2025-12-08
- 摘要：A new simple system of 3-D radars-the system of height finding by comparing phases of two beams radiated by a single doubly-curved antenna-is presented. The principle of producing phase difference of two beams and its algorithm are studied. A brief description is given to the effect of S/N on the height finding accuracy. The problems of height finding starting point of low elevations and dual values are analyzed and the corresponding solutions given. The trials of prototypes and the practical tests with aircrafts have proved that the system is feasible and completely fulfils the requirements of indicating radars with targets. This system is simple in structure, easy to realize and low in cost.2|39|2更新时间：2025-12-08
- 摘要：The radiation and coupling of linear antennas in a rectangular waveguide are discussed by means of dyadic Green’s function, field transformation and reaction concept. The general formulas of field intensity and mutual impedance are given. Lengths, feeding points, and orientations of antennas in the wavegu de are all arbitrary. As examples, expressions of mutual impedance for eight specific cases are given and discu ssed.4|50|3更新时间：2025-12-08
- 摘要：This paper has made a further research into the space features of stereo X-ray images.A method for extracting space features from stereo X-ray images has been proposed. The method consists of imaging model, correction of the distortion resulted from the system non-linearity and automatic point match of stereo X-ray images. The obtained results have shown that the relative error of measuring depth is less than 0.7% at distance of 550.0mm.4|28|0更新时间：2025-12-08
- 摘要：Neural network is a new kind of representation model which differs from the current logical model. In the paper, we apply it to RODES -an expert system for diagnosing nuclear reactor fault and propose the idea of neural net heuristics. The parallelism, distribution and capability of learning of neural net heuristics provide a new way for knowledge acquisition, knowledge representation and uncertainty reasoning in expert systems. The practice in nuclear reactor fault diagnosis shows its potential power in the research of artificial intelligence.4|76|15更新时间：2025-12-08
- 摘要：This paper describes how to use syntactic structure knowledge for continuous speech recognition. At first, the method for constructing syntactic structure model was introduced, then describes how to search the final recognition result based on syntactic structure model and initial results from speech processing part. Three heuristic search algorithms are proposed: （1） Maximum Likelihood First （MLF） search;（2） Partial Maximum Likelihood Firs （PMLF） search;（3） Maximum Likelihood Nearest Neighbour （MLNN） search.2|69|4更新时间：2025-12-08
- 摘要：An improved finite element method for analyzing the eigenvalue problem of the open dielectric waveguides is presented. The basic idea of the method is an introduction of a transition region between the interior arid exterior regions. The introduction of the transition region in which the new adaptive interpolation functions are used, makes the total field approximation much more close to the practical field distributions than the simple classical treatment, and the quality of discretization much better. Dispersion characteristics for several dielectric waveguides are calculated by the improved finite element method. The comparison with the previous results obtained by other methods are made, and much better accuracy has been found. The reliability and the efficiency of the improved method are thus verified.2|43|1更新时间：2025-12-08
- 摘要：In this paper,the noise circuit theory for the noise analysis of complicated network having large number of noise sources and considering correlation between noise sources is described. The computer programs of noise performance analysis and low noise design based on the noise circuit theory are made. The computational and analytical results of IC operational amplifier MA741 are given, and the optimal circuit parameters of μA741 at the minimum noise state are obtained.4|476|5更新时间：2025-12-08
- 摘要：In this paper, a set of canonical piecewise-linear equations for nonlinear dynamic networks is presented. The advantages of this algorithm are that the calculation of an instant response is converted to that of canonical piecewise-linear algebraic equations and that the computation of time when the response crosses a boundary is not needed. Therefore, this algorithm is efficient. This algorithm is designed both for autonomous and nonautonomous networks. The application of the algorithm to nonlinear dynamic networks with multiple solutions is also discussed.2|21|4更新时间：2025-12-08
- 摘要：Target characteristics and high frequency scattering mechanism are summarized. RCS analysis methods, RCS reduction approaches and low RCS target detection techniques are discussed. Some new achievements and important problems demanding prompt solution are introduced.2|159|1更新时间：2025-12-08
- 摘要：This paper proposed a new way to optically control millimeter-wave oscillators. Unlike previously reported optically controlled oscillators, the new way can produce a positive frequency variance. In our experiments, a frequency change of about 150 MHz has been observed in a Ka band Gunn oscillator.2|39|1更新时间：2025-12-08
- 摘要：A high speed BiCMOS technology for integrated system is described. NPN and CMOS devices have been fabricated on the same chip with a buried twin well and epitaxy structure, using 2μm design rule. Satisfactory characteristics of single device have been achieved. Under heavily loading condition the speed of BiCMOS inverter is much faster than that of ordinary CMOS inverter.2|34|0更新时间：2025-12-08
- 摘要：The Monte Carlo method has been used to study the yield for threshold voltage VT of short channel MOS transistors. As the channel length of MOS transistors is getting smaller, the dispersion of VT becomes serious due to the short channel effect. Besides, when channel length L enters submicrons the depletion layers of source and drain junction may cause channel to disappear. As a result of both reasons above, the yield of VT drops.2|26|0更新时间：2025-12-08
- 摘要：The flicker noise of metal films prepared by sputtering of copper onto the oxidized silicon and sapphire substrates is studied by means of surface characteristics for the first time. The results show that the noise behaviour and the surface physics of the metal films on these two kinds of substrates are different from each other and that the roughness and irregularity of the film surface play an important role in generating the flicker noise of metal film. In addition, the physical model of the noise is similar to the flicker noise mechanism of MOS device.2|42|0更新时间：2025-12-08
- 摘要：A simple method is presented for the minimal state-space representation, described by the Givone-Roesser model of 2-D system.2|82|2更新时间：2025-12-08
- 摘要：In this paper, a broadband AM/PSK modem is introduced. It has a feature of new design,simple implementation and high performance. With the modem, experimental networking was successfully done in a broadband MAP network. The production and application of the modem will provide a powerful communicaton means for the realization of CIMS in Chinese industry.2|89|1更新时间：2025-12-08
- 摘要：In this paper, the relation of joint loss of Fiber-Optic Connector with operating wavelength and axial separation is studied experimentally and theoretically. The experimental results are explained as well.2|58|1更新时间：2025-12-08
- 摘要：This paper is concerned with design of broad-band array processors. The design problem is formulated as semi-infinite quadratic optimization （SIQO） model. Then SIQO method is used to find the optimal weight vector. The resulting processors without presteering have broad-band characteristics similar to that of Frost processors. The results are verified by computer experiments.2|16|0更新时间：2025-12-08
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