Abstract:In this paper, the distribution of spectrum estimation is qiven, and using this result, analysis of statistical characteristics of the output of simulation system is studied. And then. the confidence of system simulation and the consistency of the data between simulation and true system are discussed.

Abstract:This paper presents an approach to terrain uniqueness analysis in terrain contour matching. The approach, based on the physical model of terrain contour matching, defines a probability vector to describe the local terrain uniqueness and thus provides a way to measure terrain uniqueness via entropy. From analysis and computer simulation, the paper concludes that the lower the terrain entropy, the better the terrain uniqueness and the higher the performance of terrain contour matching.

Abstract:The design of Satellite Constellation is one of the important steps to carry out space missions. This paper focuses mainly on the problem of how to design δ constellation effectively. The method, which is used to analyse the covering condition of some area with many satellites at one certain time, is discussed and certified. Based on this method, δ constellation is analysed by the means of simulating calculation. The method to design δ constellation is given at the end of the paper, and some δ constellation, which are designed by this method to fulfill some special needs, are listed.

Abstract:In this paper, the character of high altitude plume flowfield is analyzed. The principle of DSMC method and its key points are also discussed. Then, the flowfield of nozzle exit vicinity and backflow region are calculated by using DSMC method, The results show that with this method, the flow property of this region can be accurately described.

Abstract:The numerical calculation of the unsteady full Navier-Stokes equations by means of time-marching is discussed in this thesis. To simulate jet wake and main flowfield's diturbance of axisymmetric blunt body, the finite volume method is used in the governing equations. The numerical results of time-marching give some fine topological structure of near wake. In addtion we make comparison and analysis in some different ratioes of pressure.

Abstract:In multipart multimedia conferences, each participant may desire to view all of the other participants and other contributed images and video streams or subset of them. And so video composing is an important research topic. This paper discusses combining modes and combining strategies and combining methods of video images. Combining algorithms of video images are given based on relay level of video images. The performance of three combining modes is analysed and compared as well.

Abstract:In order to improve efficiency of query processing while exploring the parallelism, according to the features of asynchronous parallel query processing model in parallel object-oriented databases, three parallel query optimization strategies are proposed, They are: (1) the data subset preselection strategy; (2) the information flow delayed strategy; (3) the information flow reduced strategy. They are suitable for not only the single query but also the multiple queries. The simulation results show that they are efficient practical parallel query optimization strategies.

Abstract:In this paper, we present a method of training a feedforward neural network using supervised learning scheme to balance an inverted pendulum and cart system. The data used to train the neural network was obtained from a human expert doing the same task. The trained neural network uncovers a set of rules which could be very difficult to derive from the human expert. Comparison was made between the neural-network learned rule and a decision tree rule deducted by Quilan's ID3 induction algorithm using the same set of data. Experiment results showed that the neural network learned rule is more robust. At the same time, we find that the neural network learned rule can be modified to do a similar and more important task——the attitude control of a rocket.

Abstract:Intention is an important cognitive concept to specify multi-agent system. An intention theory is presented in this paper to support the research on the theory of multi-agent system computing. Based on the action modeling theory of multi-agent system computing, the new formal semantics of the intention is defined and some important properties are obtained.

Abstract:With the property of simple structure, self-routing and low hardware complexity, Banyan networks has been taken as interconnection network by many multi-processor systems and switching systems. However, its blocking property limits its performance and wide use. It is known that Banyan network is nonblocking for some special input/output patterns. In this paper, a class of nonblocking property of Banyan network is discussed, then some useful examples are demonstrated through application to ATM switch design: to promote ability of load sharing through data distribution and to implement multicast ability using lower hardware cost.

Abstract:The advent of multimedia application calls for new scheduling paradigms in operating system. The new paradigm should be able to handle the combination of hard real-time、soft real-time and conventional application present in many multimedia systems. This paper proposes a CPU scheduling model supporting the functions described above. The paper proposes two algorithms to implement this model: QoS-based CPU bandwidth partitioning algorithm and two-level priority algorithm.

Abstract:According to the requirement of design of electronic system and device, this paper proposes an object oriented product data model-design body model. Based on the model, the paper presents the implementation strategies of configuration management and version management of product data.

Abstract:This paper presents briefly the features and the application range of dynamical energy allocation (DEA) at first. Then it proposes an improved DEA scheme based on the analysis of some typical DEA schemes and gives computer simulation results. Finally, some problems which remain to be further studied are discussed.

Abstract:This paper discusses a method to reduce calculation load by means of layered searching construction of association hypothesis events. The layer here can take 0 value or an integer L. Layer 0 means that no target can find its association data from current returns. Layer L means that L targets can find their association data from current returns. Our layered construction method in the paper is recursive and of independence among layers, so it can also be implemented in parallel structure. Comparative analysis of the method with relative methods in other references and the corresponding computer simulation tests and the results are also given in the paper.

Abstract:Spatial database is the core technology of Geographic Information System (GIS). On the X-2000 three dimensional electronic map we developed a spatial database system with new architecture and technology. This paper introduces the design and implementation of this spatial database system.

Abstract:The multi-conductor transmission-line theory is very efficient for analysing transfer characteristic of stator windings of large electrical machines. The paper describes parameters calculation of equivalent circuit of stator windings upon this theory.

Abstract:In this paper, we've discussed the methods of deciding the optimal spacing between elements and the oblique angle of the phased array antennas. Instead of drawing only by hands, we design a program, which can be used for optimizing calculation and drawing automatically. Furthermore, it's simple and of high precision.

Abstract:Based on the dynamics models and their identification of mechanical-electronic systems of flexible machining devices, we have built up a real condition monitoring model which includes BAYES fault detection, abrupt fault detection and fault analysis&location. Utilizing the Kullback information distance and the multilevel hierarchical AR model, we have realized the prediction and alarming of faults of flexible machining devices. The experiments on the JCS-020 Machine Center have indicated the models are feasible and valid. They can properly eliminate the influence of the changeful machining mode and process, the factors of time-varying and random disturbances on the condition monitoring, fault diagnosis and prediction, and greatly improve robustness and adaptability of monitoring and diagnosis in the FMS environments.

Abstract:In this paper, the semi-ductile regime grinding mechanism by creep feed method is analysed. A new fracture ratio is defined to measure the effect of semi-ductile regime grinding. The experimental method and the experimental equipment are presented. The experimental results are analysed and compared. The experimental results show that the semi-ductile regime grinding of hard-brittle material can be carried out in a universal grinding machine tool, and the grinding effect can be improved remarkably by the creep feed method.

Abstract:In this paper, firstly, the requirement of application to in telligent information processing in modern combat environments is analyzed, then, an introduction and analysis of the use of artificial neural networks (ANN) in military electronic information processing is presented in detail. The emphasis is laid on the use of ANN in the detection, recognition of radar, infrared and sonar objects as well as in multi maneuvering target tracking (MMTT) and the intelligent control of weapon systems. By presenting both theory and examples, the characteristic and priority of the ANN technology is shown, at the same time, an outline of the use of ANN in other aspects of military electronic information processing is given. At the end of this paper, in viewing of the lagging of the field application behind lab research of ANN, we give an analysis of the necessity and urgency to perform research on system validation about ANN's capability.

Abstract:For ultraprecision positioning, the use of the twist-roller friction drive is proposed. In this paper, it's structure and principle are analyzed, and new conclusion is reached.

Abstract:On the basis of the old printed planar log-periodic antenna, a new type is proposed. Overcoming the shortcomings the old one has, the new one has better properties. 0.4～2GHz new type antennas are manufactured, VSWR, gain, E plane and H plane far field pattems over the entire frequency range are measured, showing very good broadband properties.

Abstract:In this paper the heating uniformity of porcelain is studied by microwave and far infrared radiation, the results indicate that the uniformity of the former is superior to the latter. The germicidal efficacy of microwave and far infrared radiation is compared in laboratory. It is also demonstrated that the efficacy of microwave is significantly higher than that of far infrared radiation.

Abstract:In order to make conditional inference, the expression of conditional events is discussed in this paper. The corresponding rules of logical operations are given. The concepts of the probabilitic ratio between two zero-events and conditional hyperprobability for iterated conditional events are introduced.

Abstract:This paper presents the new formula for computing the number of the leader-set of cyclotomic cosets. The explicit number of the cyclotomic cosets of length k is fixed. The method for computing the dimension of narrow-sense primitive BCH codes is offered. Finally, we decide the period distribution of this kind of codes.