Abstract:According to the distributions of target features and noise, this paper presents the formula of the minimum error probability (Bayes error probability) in some conditions. This formula relates directly the minimum error probability to the distributions of features and noise and can be used to analyse the effectiveness of target features in noisy background. As an example, the effectiveness of IR. radiation features of target and decoy is analysed in the paper.

Abstract:The time-frequency distribution of radar echoes of airplanes has been analysised by the wavelet transform. With the time-frequency distribution, which clearly exposed the scattering characteristics of targets, this paper also applies the moments method for target recognition, and get satisfactory results.

Abstract:A fuzzy self-organizing nueral network (FSNN) model for data fusion in the target recognition field is presented in this paper. The FSNN include the fuzzy C-mean algorithm and KOHONEN nueral network algorithm. We can get more correct recognition rate about 7% from the fusion algorithm than from any single senor.

Abstract:An effective detection method based on the neural network is proposed in this paper. By the self-organizing learning in high efficiency, it can model different kinds of noise or clutter rapidly and accurately. This results in a good detection performance, and this detector can approximate the optimal ones on the condition of different statistical distributions. Finally the experiments have proved the effectiveness of this approach.

Abstract:This paper in troduces a fuzzy model of signal-detected based on fuzzy theory. The model is applied to velocity search of CW Doppler Radar, and the result achieved is satisfactory.

Abstract:Spectrum analysis is the most important branch in radar signal processing and significant of radar target classification and feature detection. Having the special property, higher spectrum is very useful for us to analyse radar echoes from a new view. This paper presents double (Q, K) bispectrum algorithm for ultra-wideband radar echoes. Compared with other bispectrum estimation algorithm, simulation results show that the algorithm we presented here has significant improvement. At last, we cite an example for the application.

Abstract:In this paper, the Linear Kernel TFR is proposed according to the AF of the sum of chirp and its delayed version. The method enables us to obtain high time and frequeney resolution while suppressing cross-term and minimizing the noise in the signal. Analytical and practical demonstrations have proved the validity and applicability of the proposed method.

Abstract:A speaker-dependent Chinese speech recognition system based on improved SEVQ matching algorithm is presented. The overall plan of the system, the choosing method of the system's parameters、methods of recognition preprocessing、principles and methods of speech mode matching are described particularly. The system's real-time recognition rate is over 93%.

Abstract:This paper presents a new divide-and-conquer algorithm for the eigenvalue problem of symmetric tridiagonal matrices. The new algorithm oases on bisection and secant iteration, which is different from Cuppen's method and Laguerre iteration. The results of theoretical analysis and numerical testing show that the convergent rate of our algorithm is obviously faster than that of Laguerre iteration presented in [1]. When the problem scale is quite large, with the same requirement of accuracy, more than 40% of the computing time can be reduced by using this new algorithm.

Abstract:An Archimedean plannar spiral antenna mounted on the grounded double-layer is investiged. Based on the substrate superstrate Green' s function in terms of Sommerfeld-type integrals for a horizontal Hertzian dipole on the superstrate, the current distribution along the spiral arm is determined by using an integral equation with the moment method, the input impedance, radiation pattem, axial ration and power gain are calculated on the basis of the obtained current distrbution, which is very important for optimum design of the printed wire antennas. Experimental results show that the numerical method is correct .

Abstract:A system based on object-oriented large-grain data flow model, called OOCPCS, is designed to facilitate parallelism in distributed system. Its underlying model of computation is an integrated object-oriented paradigm and large-grain data flow model, called OOLGDFM. It introduces persistent state object and object-oriented features into large-grain data flow model. Its graphs are constructed dynamically. The paper discusses the realization of the model in OOCPCS, the use of forward _ list, parallelizing compiler, POC programming language, object-oriented network file I/O, and the virtual OOLGDFM machine.

Abstract:Finite-Volume method was used to solve the three-dimensional Navier-Stokes equations of ideal gas, and combine flux conservative patched method and B-L turbulence model correction to study this problem, capturing fluid field informations such as separation vortex, shock wave, expansion wave.

Abstract:In this paper, based on the principle of Hilbert connection for real and imaginary part of vibration signals, the inspecting technique for nonlinear vibration was developed. In accordance with the special characteristics of engineering structure, a sort of fast algorithm and correction technique was used. By application in a fairing of rocket, it was proved practicable.

Abstract:This paper introduces the development and the related work of the assembly-oriented computer aided design, presents a representation scheme of a compound-body to the computer and focuses on the research of computer aided graphic assembly technology for 3-D objects.

Abstract:A new forword NN structural and weight learning algorithm is adopted to build the non-linear dynamical NN models for the servo-feed systems of a“T”type ultra-precision machine tools. Based on these NN models, an adaptive MRAC can be devoloped to control and compensate its non-linearities.

Abstract:A new type device for fixing and starting racing boats is described in this paper. The device mainly consists of float platform, back fixing units and side supporting ones. It is unnecessary to operate under water and the system can be moved easily for changing racing range because the whole system floats on water. Application in the 1st World Dragon-boat Championship proves that it is simple to produce, easy to use and reliable. The PRC patent number of the device is 95236969. 9.

Abstract:Aiming directly at the problem of detecting the motor's engine fault effectively, a hybird expert system method which combines the artificial neural network with the traditional expert system is presented, taking into consideration the characteristrics of the engine's structure. The structure, the composing and working procedure of the intelligent diagnostic system used for fault detection of motor's engine are studied and discussed. An example for application is also given in this paper.

Abstract:A method to calculate the dry mass of single-stage vehicle is proposed in this paper. A baseline vehicle is presented for the given flight mission, and the effects of the tank material, the thermal protection system and the design margin on the vehicle dry mass are calculated. The calculation results show that the advanced material and design can decrease the vehicle dry mass and its sensitivity to the design margin.

Abstract:Based on the nonliear mathematical model for the steady state operation of a liquid rocket engine, the effects of each interfering factor on the parameters of liquid rocket engine are calculated. The comparative analysis is carried out for the effects of the interfering factors on the engine parameters by using both nonlinear method and method of small deviations. The results obtained can be used for the analysis of the pump-fed gas generator cycle liquid rocket engine test results，the reliability analysis and the fault analysis, and also for bringing to light the variation of the engine parameters with various interfering factors.

Abstract:This paper describes a new approach to robot path planning : the transition cost matrix based approach. By defining the concept of transition cost matrix and the 2-ary operator on the transition cost matrix, the optimum paths are generated from the operations on the matrix, thus the optimum paths between all points in the environment can be achieved via limited matrix operations to attain the aim of constructing the optimum path set at the preprocessing stage. The paper ends with the application of the proposed approach for mobile robots’mission planning.

Abstract:Four kinds of new compounds,1,4-bis(chloromethy1)-2-methoxy-5-ethoxy benzene,1,4-bis(chloromethy1)-2-methoxy-5-butoxybenzene,1,4-bis(chloromethyl)-2-methoxy-5-heptyloxybenzene and 1,4-bis(chloromethy1)-2-methoxy-5-octyloxybenzene, are synthesized by using the chloromethylation of respective 1-methoxy-4-alkoxybenzene. The structure of these compounds is characterized by IR and ¹HNMR.

Abstract:A modified low nickel 5% wt supported Al₂O₃ catalyst was prepared for vapor phase hydrogenation of benzene. The catalytic activity was affected by the reaction condition. The catalystic active stability、thermal stability and toxic endurance were all measured. The result showed that it was a good function catalyst.

Abstract:This paper deals with the guidance model of a pair of electromagnets displaced by each other in side direction of module structure EMS maglev vehicle, realizes guidance control using forgeting factor, and compares the guidance results of active control system and self-stable system by simulation. The influence of guide control on suspension of the vehicle is discussed.