最新刊期
卷 ， 期 12 ， 1995
- 摘要：Based on interval fuzzy sets,the inductive learning space is fuzzified,the distinction interval is newly defined to measure the learnable performance of concepts to be learned. By applying the operator of partition for basic event space,the value of distinction interval and the effieiency of inductive learning for concepts to be learned are improved.Fuzzy inductive learning Algorithm （ILA） is presented for fuzzy inductive Learning problems. In terms of the example sets of concepts offered by experts,algorithm ILA can learn fuzzy inference rules about concepts to be learned. Finally,the complexity of algorithm ILA is also discussed.关键词：Fuzzy set theory;inductive learning;algorithm4|115|7更新时间：2025-12-08
- 摘要：A technique is presented for the determination of complex permittivity of low-loss liquid materials at microwave frequencies. By using high Q factor TEOmn multimeding circular cavity ,ε’γ and tanδ of the low-loss liquid materials can be measured accurately. The uncertainty of ε’γ is ±0. 5% ,and that of tanδ is ± 5. 8%. Frequency response of ε’γ and tanδ is observed within a band. The technique is simple ,rapid and automated for measurement ,and it can be used for measurements of different low-loss liquid materials.关键词：Low-loss liquid materials;Complex permittivity;microwave;Measurements.3|159|3更新时间：2025-12-08
- 摘要：In miniature optically pumped NH3 submillimeter wave lasers,interaction of Raman processes becomes an important effect,which dominates the laser output intensity and spectral characteristics. AsCO2-9R （16） laser line pumps NH3, two Raman processes s→a P （ 7,0 ） and s→a P （7,1）interact and enhance each other,while CO2- 9R （30） line pumping , competrtion among the Raman processes appears.关键词：Submillimeter wave laser;Raman process;Interaction of Raman processes3|34|3更新时间：2025-12-08
- 摘要：The new nonuniform mesh FDTD method is presented in this paper. The special treatments of calculation are taken at interfaces between little and large lattice,and the problem of accuracy and amount of computation is solved fairly well. The 2-D transient scattering by cylindrical targets is considered using this method ,and compared with the conventional FDTD method.关键词：FDTD method;Nonuniform mesh;Transient scattering2|275|3更新时间：2025-12-08
- 摘要：A new dispersion compensation method for high-speed terrestrial cascaded Erbium-Doped Fiber Amplifier wavelength division multiplexed （WDM） optical transmission systems is proposed in this paper. By means of specially designed dispersion-shifted fiber（SDDSF） with zero dispersion wavelength around 1. 6μm and dispersion slope S0=0. 05ps/km/nm ,-2～-4ps/km/nm dispersion is generated at 1550nm to avoid severe four-wave mixing in WDM systems using ITU-T G. 653 DSF. The positive dispersion of ITU-T G. 652 standard single-mode fiber is utilized to compensate for the negative dispersion of SDDSF over 1530～1570nm （EDFA bandwidth ）. With this method, dispersion induced eye opening penalty could still be less than 1dB after 1000km fiber transmission in systems with bit-rate higher than 10Gb/s per channel.关键词：dispersion compensation;Four-Wave mixing;Dispersion-shifted fiber2|59|1更新时间：2025-12-08
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Partitioning Viewpoint Space for the Aspect Graph of Polyhedral Objects Under Perspective Prejection
摘要：The aspect graph is an approach of representing 3-D objects by a set of 2-D views in computer vision. This paper discusses the algorithm of partitioning the viewpoint space into regions,such that in each region the topological structure of the perspective projection of polyhedral objects does not change.关键词：computer vision;Object description;Aspect graph2|49|1更新时间：2025-12-08 - 摘要：The noniterative channel estimation algorihtm[1] is further studied,and two theorems are proposed and proved,which provides a theoretic basis for practical application.关键词：信道估计;系统辨识;非迭代算法;信道2|95|2更新时间：2025-12-08
- 摘要：The property and the differential characteristic of maximum likelihood direction-of-arrival estimation （MLE）function for every variety of centrosymmetric array are investigated in the paper.关键词：Maximum likelihood direction-of-arrival estimation;Gauss curvity3|250|17更新时间：2025-12-08
- 摘要：In this paper, we present the voctors systems called complete system. A class of Boolean Functions with 2nd order correlation immunity are constructed by using the Voctors’systems,and the relation of structure among the functions is discussed.关键词：Boolean function;correlation immunity;Construct;structure2|32|4更新时间：2025-12-08
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The frequency domain analysis of radar improvement factor limited by phase noise of frequency source
摘要：Radar improvement factor limited by phase noise of frequency source is studied. The formulas of the phase noise spectrum density of receiver video signals are given when radar signals are in the form of rectangular pulse or linear FM pulse. The formulas of the limited improvement factor are also given.It is proved that the formulas in frequency domain and time domain are identical.关键词：Frequency source;phase noise;Radar improvement factor2|361|11更新时间：2025-12-08 - 摘要：This paper deals with the performance of the multilevel PSK spread spectrum （SS）systems with trellis coded modulation（TCM） for indoor communications. A tight upper bound of the performance,which is verified by computer simulation,is derived.The moment method based on the maximum entropy is exploited to extimate the probability density function for the multiple access interference and multipath interference. The construction criteria of TCM in indoor channel is discussed briefly. The effect of the phase error on the system performance is studied.The numerical and simulation results show that the performance of the trellis coded SS system is improved considerably over that of the conventional uncoded SS system.关键词：Trellis-coded modulation;Spread Spectrum Multiple Access;Indoor communications2|56|1更新时间：2025-12-08
- 摘要：The paper presents a speech coding system, called Chinese speech recognition vocoder,with extremely low bit rate-60bps. Experiments on 32 sentences comprising 267 syllables showed that, the average intelligibility of sentences is 91.9% while the average syllable recognition correct rate is 74. 16%. The structure of the vocoder is introduced,and experimental results are given.关键词：speech coding;speech recognition;Vocoder communication2|80|5更新时间：2025-12-08
- 摘要：The Harmonic Balance method is an efficient method in steady state analysis of nonlinear circuits.As a very important part,algorithms of spectra calculation should be selected carefully.In this paper,we apply a new algorithm to calculate the spectra of nonlinear elements,which fully utilizes the nonlinear functions’characteristics and the known frequency components in the steady-state response.Without any sampling,we get the spectra directly.The time and memory have been greatly reduced.关键词：Nonlinear Circuits;Harmonic balance method;Spectra calculation;Steady-state Analvsis2|63|1更新时间：2025-12-08
- 摘要：A new neural network for general linear programming and its theroy are proposed.The network is capable of achieving the exact soultions. In contrast to the augmented neural network,the new network is convenient to implement and has less state variables.关键词：General linear programming;neural network2|119|3更新时间：2025-12-08
- 摘要：Neumann’s method has been used to investigate the low-frequency electromagnetic scattering problems by an infinitely long conducting cylinder ,Both E-wave incidence and H-wave incidence have been studied and some numerical examples have been expounded. The Neumann’s series solution has the virtues of fast convergency for low frequency calculations and does not involve the matrix inversion in the numerical formulation. The surface current distributions are obtained as simple summations ,and hence the computational time is greatly saved compared with other numerical methods.关键词：Regularized intergral equation;Conducting cylinder;Neumann’s series solution2|73|1更新时间：2025-12-08
- 摘要：The probability distribution and the average ambiguity function of the radar waveform ,and the probability distribution of the range sidelobe （RSL） are systematically analysed for a new kind of noise radar-random binary phase coded （RBPC） CW radar.A statistical method of reducing the RSL by 30dB is presented. In the meantime,the design of the system parameters is made and the extention of the doppler Eolerance is discussed.It is shown that this kind of noise radar can detect long-range and high-speed targets.关键词：Random binary phase codes;Noise radar;Phase-coded modulation;Continuous wave radar;pulse compression2|535|47更新时间：2025-12-08
- 摘要：A sufficient and necessary condition for a group of multiple-valued logical functions to form a permutation is presented in this paper.关键词：Multiple-valued logical function;permutation;Statistical independence2|52|3更新时间：2025-12-08
- 摘要：A novel toplolgic construction and the synthetic method of mirowave active filter are presented,and the computer simulation is made. The CAD results show that the given microwave active filter does have a good narrow-band filter property. The positive gain of more than 10dB in passband and the attenuation of more than 30dB in stopband are achieved.关键词：Microwave active filter;GaAs FET;MMIC;CAD2|128|3更新时间：2025-12-08
- 摘要：A Scheme of radar image for achieving high range resolution is presented.The high resolution is achieved by processing a carrier with frequency kept constant wrthin each pulse ,but frequency shifted from pulse to pulse by a fixed frequency step size. According to the requirement of engineering design,the effects of system errors including frequency error and the error from the quadrature demodulation are analysed and experiment simulated with computer.A series of simulation results and quantitative relationships with some error are given.关键词：Pulse to pulse frequency shifting;resolution;Quadrature demodulation;System error2|121|21更新时间：2025-12-08
- 摘要：The modeling theory and method of black box’for weakly dynamic nonlinear systems are studied and the modeling results for the practical systems are also presented in the paper.关键词：nonlinear systems;Volterra functional series;system modeling2|276|6更新时间：2025-12-08
- 摘要：Calculations have been made for the rotationally symmetric monopole antennas with different shapes by moment method. By comparing VSWR, gain and the volume of the antenna, an ideal configuration is obtained. The curves of the low cut-off frequency and the frequency at which the maximum direction of the radiation pattern begins to turn upwards versus the antenna height are given.Theoretical calculations and experimental results are compared with excellent agreement.关键词：Broad-band antenna;Monopole;Moment mothed2|214|14更新时间：2025-12-08
- 摘要：An antenna with frequency selective subreflector is introduced ,and the measured radiation patterns and RCS of the antenna are given. The resuhs show that this antenna can obtain about 20dB of RCS reudction and similar radiation properties in comparison with the antenna having ordinary subreflector.关键词：radar cross-section;Scattering by antenna;frequency selective surface;Stealthy Technique2|166|5更新时间：2025-12-08
- 摘要：A novel microstrip antenna with large bandwidth is studied in this paper,with the design method and the experimental results to be presented. Also,the relationship between the input impedance and the structure parameters has been discussed. A more than 33% measured impedance bandwidth for the antenna with VSWR less than 2 can be achieved ,and the 3dB beamwidths of the antenna at different frequencies in the band are between 50°and 70°.关键词：microstrip antenna;Large bandwidth;Tri-plated line feed2|164|2更新时间：2025-12-08
- 摘要：In this paper,under limited-band condition,the precise solution of sampling-variance with N samples and ALLAN variance and Two samplies without any approximation condition are derived for the frequency flicker noise which has power law spectral density in frequency source,to be based on the results given in literature[2] ,by using stochastic signal processing theory and transformation technique. This problem has not been solved from literature[1] to [6].关键词：Frequency stability theory;Limited-band;Sampling-variance with N-samples;Precise solution4|58|1更新时间：2025-12-08
- 摘要：Based on iterative-deepening and modifying heuristic evaluation function dynamically,fuzzy heuristic search algorithms FIDA and Improved-FIDA are presented. The learning algorithm LFIDA is also presented to overcome the difficulty to design fuzzy heuristic evaluation function h （n）关键词：人工智能;启发式搜索;算法;学习2|52|4更新时间：2025-12-08
- 摘要：第四届国际固态和集成电路技术会议ＦｏｕｒｔｈＩｎｔｅｒｎａｔｉｏｎａｌＣｏｎｆｅｒｅｎｃｅｏｎｓｏｌｉｄ－ＳｔａｔｅａｎｄＩｎｔｅｇｒａｔｅｄ－ＣｉｒｃｕｉｔＴｅｃｈｎｏｌｏｇｙ第四届国际固态和集成电路技术会议（ＩＣＳＩＣＴ＇９５）于１９９５年１０月...2|13|0更新时间：2025-12-08
- 摘要：In this paper,a new approach to space-time adaptive processing has been proposed,It is of practical use since it posseses better performance and smaller computational load.Especially,it is very suitable for the array antenna is placed on the aircraft by non-facade side.关键词：Airborne array radar;Space-time adaptive processing;Coutter suppression2|244|6更新时间：2025-12-08
- 摘要：This paper has given a new nonsymmetric neural network model,which can be used to solve unconstrained minimax problem. We have proved that nonsymmtric linear and nonlinear neural networks are Lyapunov stable and the solution is the stable point of the Lagrange equation. The computing result show that this method is better.关键词：neural network;Nondifferential programming;Minimax problem2|71|7更新时间：2025-12-08
- 摘要：Based on the structure of linear programming neural circuits and a simiplified neuron model as a principal component analyzer, a left-right neural network （LRNN） is proposed, and its boundedness and stability are given and proved. Both LRNN and its anti-Hebb rule can solve the singularvalue decomposition of the general matrices and the eigenvalue decomposition of the symmetric matrices. The related simulations are also given.关键词：Left-right neural network;Singularvalue decomposition;stability;Anti-Hebb rule2|114|0更新时间：2025-12-08
- 摘要：南京理工大学微波工程研究中心ＭｉｃｒｏｗａｖｅＥｎｇｉｎｅｅｒｉｎｇＲｅｓｅａｒｃｈＣｅｎｔｅｒ，ＮＵＳＴ南京理工大学（原华东工学院）是全国重点大学，位于六朝古都南京东郊风景区，与中山陵、紫金山天文台、灵谷寺、明孝陵等风景名胜毗邻．校园面积近１７３公...2|42|0更新时间：2025-12-08
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