最新刊期
卷 ， 期 11 ， 1995
- 摘要：This paper presents a new approach based on a simulated evolution （SE） method to optimize the design of filters. SE method can be used to search for the optimum parameters of a filter so as to accurately match with desired frequency characteristics. The basic idea of SE and the practical implementation are described. The results show the advantages of SE algorithrm and its applicationprospect for optimization of the pararmeters of filters with non-standard frequency characteristics.关键词：simulated evolution;parameter optimization;matched filtering;Infrared systerm2|97|2更新时间：2025-12-08
- 摘要：After analyzing the traditional equation on the Thermally Stimulated Current （TSC） of dipoles with a single activation energy, especially on the physical meaning of the transcendental function in the TSC equation,a new kind of thermally stimulated current theory with an arbitrary dipoles activation energy density distribution is deduced. With the expression obtained in this paper,it is easy to get the numbers and activation energy density distribution of the dipoles which attribute to the currents.关键词：Solid dielectric;Dipole;Thermally stimulated current;Activation energy density distribution2|132|0更新时间：2025-12-08
- 摘要：A kind of Bi-MOS Hybrid-Mode Transistor is proposed. The structure of BMHMT is essentially a four-terminal MOSFET with MOS and LBJT working together, so the processes of BMHMT are compatible with MOSFET,The current driving capability of BMHMT is higher than any of the single MOSFET,the single LBJT or their simple combination. The experimental results show that the magnitude of current gain of BMHMT is as high as 2500(VBS=0. 62V) under 0.smA collector current per unit width. Moreover, under low base current level, the short channel effect is lower than that of MOSFET. Above characteristics have been successfully proved by simulation of PISCES device simulator and experiment results.关键词：Hybrid mode;LBJT;MOSFET2|30|4更新时间：2025-12-08
- 摘要：It is illustrated in manufacturing micromotor that the contact friction between rotor and substrate or axial is a major hurdle in the instability of rotor. The rotation rate and lofetime are far away from the theoretical value. It is a good manner of replacing the mechanical bearing by electric suspension. In this paper, we present the stable equilibrium condition of electrostatic suspension and simulate the dynamics process of levitation. We have also experimentally demonstrated the robustness and practicality of the electrostatic suspension in micromotors:a 3cm diameter and 0. 2mm thick glass plate was levitated from rest and held stably after tuning the circuits.关键词：Induction;Electrostatic suspension;Micromechanics2|94|4更新时间：2025-12-08
- 摘要：A three-dimensional recombination kinetics of carriers,adapted for GaAs bulk photoconductive semiconductor switches （PCSS）, is utilized. And three-dimensional fullwave analysis for transient EM problem of PCSS is implemented by employing both time-domain finite-difference method and superabsorption technique. Three-dimensional pictures given in this paper may be helpfulto understand transient phenomena in PCSS and the computer programmes may be useful for practice calculation. An“optimum design”is proposed,which may alleviate somewhat the major disadvantage to bulk PCSS ,its requirement for large optical trigger energies. A discussion about the effect of static field components on numerical results is also given.关键词：Bulk PCSS;Recombination kinetics of carriers;Transient EM field;Three dimensional fullwave analysis;Optimum design;Static field effect2|56|0更新时间：2025-12-08
- 摘要：The scale down of device dimension is an effective way to realize VLSI technology,however,the dimension is limited to a definite level by the influence of some parasitic and second order effects. On the basis of comparative analysis of small devices operating at room temperature and at low temperatures,the subthreshold behaviour and its effects on the device properties and scale downprinciples are described emphatically. A kind of low temperature scale down principle is presented according to the low temperature operation characteristics,which will play an important role in low temperature MOSFET optimal design and further improvement of the circuits and systems.关键词：MOSFET;Subthreshold behaviour;low temperature;Scale down principles2|180|1更新时间：2025-12-08
- 摘要：In this paper a systematic approach of 2D reasoning and 3D interpretation from a single image is presented from the point of view of perceptual organization and uncertainty reasoning.Three steps are involved in the 3D perceptural organization approach : （1）2D grouping and uncertainty reasoning;（2） 3D interpretation and justification; （3） model-based consistency verification. Experiments with real images of indoor scene have shown the robustness and efficiency of the approach.关键词：D perceptual organization;uncertainty reasoning;Simplicity assumption;Modelbased vision2|80|3更新时间：2025-12-08
- 摘要：The optical soliton transmission at 2. 5GHz by using semiconductor optical soliton source and EDFAs was achieved. In addition,numerical simulation was done according to a simplified theoretical model including generation and transmission of semiconductor optical soliton. The results agree well with experimental data.关键词：Optical soliton;Optical soliton communication;optical fiber communication;Ultrashort optical pulse2|38|3更新时间：2025-12-08
- 摘要：To the coupled MP type equations, we propose a strategy to find the optimal convergent system when the equilibrium states are given,categorize the weights by the different dynamical properties of systems,provide the representative element of these equivalent classes and a linear relation about the evolution of the system, and then we acquire the information on equilibrium states,oscillation and fault tolerance （the error of inputs and weights）.关键词：McCulloch-Pitts type neural network;Asymmetrical connection;Equilibrium state;fault tolerance;Convex hull;Finite state digraph2|87|3更新时间：2025-12-08
- 摘要：This paper presents a novel statistical macromodel-building system（SMM）. It gives a simplified model of quadratic polynomial,which is applicable to optimization techniques and tolerance design problems.关键词：Statistical macromodel;performance model;Macromodel2|18|0更新时间：2025-12-08
- 摘要：DYL process of voltage mode has been combined with MOS technology of current mode to construct the highspeed single chipsystem of fuzzy logic. The nine circuits are designed to realize the basic functions of fuzzy logic,and the feasibility has been testified by experiments.关键词：DYL circuit;MOS current mirror;Fuzzy logic circuits;Change circuits of current2|30|6更新时间：2025-12-08
- 摘要：Vector Quantization （VQ） codebooks of speech signals are researched in this paper.Codeword expection or codeword difference is chosen as characteristic variable and correlative coefficients of charcteristic variable sequences are presented ,which are used to analyze the VQ codebooks of different speech signals. Some results are shown.关键词：speech signal;VQ codebook;Characteristic variable;Coerrelative coefficient2|256|12更新时间：2025-12-08
- 摘要：The overall scheme aiming at the three-dimensional reconstruction of vascular structures from X-ray projections relies greatly on the efficient detection and structural description of the vessels in the image frames. In this paper an approach for primitive organization and selection is proposed, which deals with an intermediate visual processing level, separating the principal structures from the image for structural analysis by using a structural saliency algorithm （SSA）to organize and select the salient centerline curves and salient contour curves separately and then combining them to verify the result of the SSA and to eliminate noisy structures.关键词：Medical image processing;computer vision;reconstruction;segmentation;Salientstruture2|69|4更新时间：2025-12-08
- 摘要：An energy band model amorphous semiconductor is presented for alkali metal antimonide photocathode ,which is different from previous crystalline model. Current Transport Characteristics of alkali metal antimonide and bulk effect of Cesium in Na2KSb（Cs） photocathode are interpreted successfully for the first time on the basis of Mott-Davis amorphous theory. It’s of significance for alkali antimonide photocathodes’ recognition and development. The self-consistent results about the strength of amorphous characteristics are obtained.关键词：Alkali metal antimonide photocathode;Amorphous semiconductor2|42|1更新时间：2025-12-08
- 摘要：After overcoming the bad effect of the resonance phenomena on the back-ground CPW, a non-matching microwave package is developed for the laser diode （LD） made in China. Its frequency response to the direct modulation is measured. Then the equivalent parameters of LD are extracted. The technical way is discussed to improve the properties of LD in China.关键词：Semiconductor laser diodes;Equivalent parameters;parameter extraction2|111|2更新时间：2025-12-08
-
A New Configuration of Erbium-Doped Fiber Amplifier with Bragg Grating to Improve Pumping Efficiency
摘要：A New configuration of an erbium-doped fiber amplifier（EDFA） has been proposed to improve the pumping efficiency and saturated output power. For 1. 48μm pumping ,this configuration can double the pumping efficiency with the same fiber length. The maximum value of small signal gain is 3dB larger ,and the saturated output power of this configuration is 1. 5dBm higher than those of the normal type.关键词：EDFA;optical fiber communication;Fiber Bragg grating2|58|0更新时间：2025-12-08 - 摘要：A novel variable radix fast multiplication algorithm is presented. In the algorithm,redundant binary representation is adopted to carry out addition of two big numbers （512 bits or more）without carry propagation. The idea of variable radix fast multiplication is proposed. It makes the algorithm 33% more efficient than the radix-4 multiplication algorithm,and 11% more efficient than the radix-8 multiplication algorithm. Compared with the radix-8 multiplication algorithm, its hardware realization is simpler and it can overcome the radix-8 algorithm’s drawback that efficiency is seriously descended at worse and worst conditions. As a kernal,it is efficient for the hardware VLSI implementation for many public-key cryptosystems such as RSA cryptosystem.关键词：Redundant signed digit;Redundant binary representastion;Modular multiplication;Hardware algorithm;Variable radix2|57|1更新时间：2025-12-08
- 摘要：This paper proposes a new clustering method by using genetic algorithms for the optimization of the objective functions in conventional clustering algorithms. Experimental results show that our algorithms have much higher likelihood of finding the global or near global optimum solutionsthan the c-means and the c-lines clustering algorithms.关键词：c-means;c-lines;clustering;genetic algorithms2|760|82更新时间：2025-12-08
- 摘要：By the use of QR decomposion method, the adaptive second-order Volterra filter （SVF） are implemented based on a generalized multichannel model. The result of computer simulation indicate that the present implementation has a fast convergence and superior numerical property.关键词：Generalized multichannel signal;QR decomposion;second-order Volterra filter;adaptive algorithm2|60|3更新时间：2025-12-08
- 摘要：This paper analyses the function for fulfilling the double jump JK flip-flop,derives its characteristic equation and designs its circuit. Then we make use of the flip-flop for designing any multiple jump sequential circuits.关键词：Flip-plop;Sequential circuit2|66|2更新时间：2025-12-08
- 摘要：PLA automatic layout generator can make designer gain macro-cell quickly and conveniently. The generator is efficient for control parts of circuit design because PAL has low design costs and programmable characteristics. PLA automatic layout generator has implemented PLA automatic design from logic input to layout generation for the first time in the country.关键词：PLA;Layout generator;Layout editor2|43|0更新时间：2025-12-08
- 摘要：A two dimensional simulator has been developed for thin film submicron and deep submicron SOI MOSFET. In order to improve the calculation efficiency,the dynamic method of two steps has been used to solve Poisson’s equation and the current continuity equations for electrons and holes. The characteristics and mechanism of thin film SOI MOSFET have been discussed by means of simulation results. All of the characteristics of thin film deep submicron SOI MOSFET are more excellent than thick film SOI MOSFET. The simulation results are in agreement with experimental results.关键词：SOI MOSFET;numerical simulation;Deep submicron;Thin film2|60|1更新时间：2025-12-08
- 摘要：A unified and systematic parameter extraction for SOI MOSFET’s has been presented,thereby the CMOS/SOI ICs simulation can use simulator such as SPICE after implemented with SOI MOSFET model. The results show that the SOI MOSFET model and the utilization of extraction program are trustworthy.关键词：CMOS/SOI ICs simulation;Device parameter extraction2|88|0更新时间：2025-12-08
- 摘要：A more practical capacitance-voltage characteristic equation is derived on the basis of theoretic analysis on variable capacitance diode. A modified impurity distribution model is introduced to solve the problem that the main parameters of the model do not concur with the practical parameters.关键词：Varactor;Hyperabrupt2|59|3更新时间：2025-12-08
- 摘要：A method of selecting critical number of processors from MPP system is presented according to the time characteristics of each node in the problem graph. It can be easily implemented and is especially suitable to MPP systems with an interconnection network and distributed systems.关键词：MPP;Critical number of processors;Method2|16|0更新时间：2025-12-08
- 摘要：The understanding of object-oriented programming（OOP）in knowledge engineering is still a debatable issue. In this paper, we consider“object as intelligent agent”based on knowledge representation （KR）hypothesis,where an intelligent agent is defined as encapsulation of KR structure and process on the structure. According to the idea,we discuss the property of Agent-Oriented Programming （AOP） in AI software,with an AI programming language and environment ROOT developed by our group,and Wise Men Puzzle.关键词：knowledge representation;object-oriented;Intelligent agent2|75|5更新时间：2025-12-08
- 摘要：An analog circuit hardware implementation of artificial neuron is studied. The programmable synapse circuit and gain adjustable neuron circuit are analyzed. As an application example,a 8 X 7 single-layer perceptron network is built. PSPICE simulation results using level-2 model parameters of a 3μm CMOS process are given,and the predicted function for pattern identification is obtained.关键词：analog circuit;neuron;neural network;perceptron2|125|5更新时间：2025-12-08
- 摘要：Optical guidings in Ramarn FELs are studied theoretically and calculated. We have performed a two-dimensional program （FELOG） ,which is used to study optical guidings without and with wave-guide constructions. The numerical simulatins include optical field profile optical field radius. filling factor , and equivalent index of refraction,etc. The simualated results from experimental parameters agree well with experimental results. And the factors that affect optical guidings are analysed and discussed.关键词：Free-electron lasers;Optical guiding;Equivalent index of refraction2|35|0更新时间：2025-12-08
- 摘要：By using the unified analytical method,the performances of various inductance tuned optical receivers with pin photodiode and FET are studied. The tuned optical receiver was designed and made. The calculated curves agree well with the tested results. The 3dB band width of the receiver is more than 600MHz. The receiver can be used in the microwave subcarrier multiplexed lightwave system between 0. 9 GHz and 1.5GHz.关键词：optical receiver;Tuning network;Inductance2|40|0更新时间：2025-12-08
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0