Abstract:In this paper，a new isoparametric transformation of a parallel quadrilateral parent element and the associated shape function is constructed to derive the accurately integerated stiffness matrix of the 4-nodes quadrilateral element. It has been demonstrated by theoretical and numerical analysis that the error of numerical integration is overcome by using the method and the computing speed of the method is almost three times of that of the two-point Gauss' integration.

Abstract:In this paper，the supersonic damping-in-pitch derivatives of blunt body are calculated with two methods. One is simulant unsteady viscous flow field by solving N-S equations，and another is the analytic method of unsteady embeddy Newtonian theory. According to the numerical method，the precision of unsteady flow calculation is improved by using sub-iteration. Similar results are abtained through the two methods. The numerical method can be applied to general flow calculation (3＜M<20,0°＜a＜20°).

Abstract:The forming and developing processes of high frequency acoustic combustion are studied with the method of computational modeling in this paper. The gas governing equations are described under the Euler coordinate，and the liquid phase governing equations are described under the Lagrangian coordinate. The high pressure combustion model is adopted. It is observed that the pressure oscillations near chamber head and convergence is greater than others when there is high frequency combustion instability in the chamber. After comparing the pressure，the temperature and velocity of the mixed gas under the condition of unstable combustion，the conclusion is drawn that the oscillation frequencies in two phase flow and combustor are the same when acoustic combustion occurs.

Abstract:An optimal regression approach to fault diagnosis of liquid rocket engine is presented in this paper，which can diagnose a number of faults with fewer measurements. When the kinds of fault are fewer and the faults are not serious，rather satisfactory results of fault isolation and fault severity estimation are obtained. When the kinds of fault are fewer and the faults are serious，this approach still gives rather good fault isolation result. When there exist several kinds of fault and the faults are serious，the diagnostic effect decreases somewhat. This indicates that the result of this method is satisfactory at a wide value range of fault factors.

Abstract:Applying 8-nodes degenerated element and non-linear finite element method，the stability of rectangle conical shell under external pressure has been studied. Using the decrement method in the loading process，the curves of displacements and strains vs pressure have been obtained. Numerical and experimental results show that while bifurcated unstability occurs，the displacements and strains would sharply change and this can be used as a rule in the engineering analysis.

Abstract:A plate with uniform boundary layer suction is developed，on which the boundary layer can be controlled. The boundary layer velocity distribution on this plate is studied in various main flow velocities and suction coefficients. The experimental results are consistent with the calculation's，and the experimental results of the high speed train models on this plate are also consistent with the foreign results of the similar models on moving ground. The effect of the boundary layer can be eliminated effectively by using uniform suction plate，and thereby the air forces of models can be measured more exactly.

Abstract:In this paper, we propose a fault diagnosis model and its training algorithm based-on self generating radial basis function (SGRBF) fuzzy neuros. Two examples for the diagnosis of bearing and gear faults using this model are also given. Finally. some conclusion is drawn.

Abstract:In this paper，a new method of tool condition monitoring in milling by fuzzy set theory has been studied，the relationship between the tool conditions and monitoring indices (features) is described by a linear fuzzy equation，the parameters of this equation are determined in accordance with the possibility and the probability distributions of the learning samples. In order to verify its effectiveness，the controlled experiments of tool condition monitoring in milling has been made. the results show that it is effective to tool condition monitoring.

Abstract:The dynamic instability problem exists in，the force control of robot manipulator，which is the contradiction between response speed and stability. For the sampling control system，the accelerations positive feedback in task space can broaden the system frequency band and raise the system damping. This approach can enhance the robot manipulator's ability to adapt itself to the stiff environment and relax the dynamec instability problem in force control obviously. In addition，this article discusses the prospective application in using the integration of the filtered integral signal of the accelerator and the encodes' signal to replace the velocity coming form the position defference to remove the difference noise and improve the precision in force control of robot manipulator.

Abstract:In this paper，we define a kind of multistate coherent system which is of typical logic structure. This kind of system is widely used in engineering. Because of its special structure. it is convenient to analyse its deterministic properties. For this kind of system. a special method of finding the minimal path vector sets is studied. which is much easier than the general method.

Abstract:In this paper，the working principle and computer simulation model of proximity fuze of some type are introduced，Wigner distribution is applied to analyse the instantaneous average frequency of Doppler signal，so as to validate the model. The result shows that Wigner distribution is an effective method to process the nonstationary signal with time-varying frequency such as Doppler signal.

Abstract:This paper analyzes the effects of amplitued-phyase errors and element failure on antenna gain，beam width，beam direction，and sidelobe level in sparse array. With the help of statistic principle，the estimtion ormulas of the antenna gain loss，beam width and siedlobe level in sparse array are derived.

Abstract:The wavelet packet transforming (WPT) can give finer time-frequency localization of a signal. ln this paper，a model of multicarrier modulation system using WPT is proposed. Based on this model，a method is studied to counteract the impulse and narrow-banded interference，using decomposition of a signal in the time-frequency plane. An algorithm to select the time-frequency atom is given.

Abstract:This paper presents a 8kb/s speech coder which is based on CELP. The coder can offer toll-quality coded speech and low coding delay. The structure of the algorithm is described and the performance is analyzed. The coder and decoder can be implemented by one general-purposed 33MIPS fixed-point DSP chip. According to the objective SNR test and informal listening test，the coder shows good performance.

Abstract:The signal processing of Ultra-Wide Band (UWB) radar is a multi-task and compute-intensive procedure，so parallel multiprocessor technology must be employed to finish the procedure efficiently. This paper thoroughly analyzes the features of UWB radar real-time signal processing system. Based on the comparison between the advantages and disadvantages of various multiprocessor systems，a reconfigurable UWB radar real-time signal processing system architecture is proposed. The application of this architecture to practical systems shows its good performance，reconfigurability and flexibility.

Abstract:The main issue in designing CSCW system is how to provide efficient collaboration mechanisms. This paper originally introduces the concept of CSCW into the design of a modern police command center system. Then we discuss the design and implementation of a cooperative supporting platform for the police command center system. During the design process，we propose a hierarchical cooperative mechanism based on task and discuss several concrete cooperative methods. Finally we propose an implementation prototype GZ-PCCS based on the hierarchical cooperative mechanism and a “Centralized-Distributed” hybrid architecture.

Abstract:This paper addresses the behavior models of virtual artifacts. First we provide the results in our research on related work. Then we present a novel behavior model SCP，which is based on principles of cybernetics. for creating virtual artifacts that move and behave in simulated virtual environments. Finally，we also provide its user interface and characteristics.

Abstract:Interconnect network is an important part of massively parallel processors (MPP)，and routing algorithm constitutes the primary factor influencing on the performance of it. In this paper，we discuss the routing algorithms for direct networks，and study the wormhole-routed adaptive algorithms in detail. Finally，we give some available points to design and evaluate new algorithms.

Abstract:The precision required for neural network algorithm is an important question for hard-ware architects. This paper gives an excellent high speed BP algorithm for feed-forward muitilayer neural network using limited precision calculation. The experimental results show that the algorithm improves convergence speed with reduced precision bits.

Abstract:Efficient performance and high throughput are the major goals of the network performance management. Standard UNIX system is short of efficient management of network traffic. This research thesis implements a network traffic query utility for users to monitor the network traffic situations. The network users can also query the network/system status of their computer hosts. Having Realized the network traffic situation，manager and users can reconfigure the network configuration，or reallocate the network resources to improve the network performance and throughput. The results show that techniques presented work very well.

Abstract:The configuration for a Multiwave Cerenkov Generator is designed with the help of a 2 1／2 D fully electromagnetic relativistic Particle-in-Cell (PIC) simulation code. Good performance of the well configured device is showed by simulation under a wide range of operation conditions (U_d=300～500kV，I_b=0.45～10kA and τ_p =10～10²ns). The microwave is generated in X-band (～10Hz)with radiation efficiency in the order of 10%. The power level is approximately 300MW for its maximum.

Abstract:The samples YBCO (123 phase) have been prepared by solid state reaction method. The influence of high power microwave on the property of high T_c YBCO superconductor has been studied by means of the measurement of superconductivity (T_c) and the SEM. The experimental results show that the transition from semiconductor to superconductor takes place at the T_co≈90K，the transition width ΔT，is widened and the grains become smaller. We think the influence results from the implused high press of high power microwave. On the one hand，the pinning cores are produced，which hinders the magnetic flux from wriggling，on the other hand. the annealing can improve the connections between grains，which benefits the improvement in the critical current density J_c.

Abstract:In this paper，a fast algorithm for the fractal signal wavelet decomposition and reconstruction is put foreward. In accordance with the selfsimilar and long-term related characteristics of the fractal signals，and by means of discrete wavelet transformation (DWT)，multi-scale decomposition is carried out so as to make them become similar stationary signals and estimate them with the usual wiener filtering and Kalman filtering method，Then multi-scale reconstruction is carried out with DWT in order to estimate the primary signals polluted by noises. This paper stresses the algorithm design of the DWT filtering process，and the computing complexity is also considered.

Abstract:In the paper，we prove under some conditions，that the attractive basin of the attractor of min-max fuzzy Hopfield network increases when the connected weighted matrix decreases. In accordance with this conclusion，we design a learning algorithm based on the fault-tolerance of the network，the matrix obtained by the learning algorithm is minimum，consequently，the fault-tolerance of the network is optimal. Finally，the example demonstrates our conclusions.

Abstract:The paper diseusses the problem of discounted model，and gives anapparent stopping rule.