Abstract:A fast design method for the lunar satellite transfer trajectory is presented by combining patched-conic technique and ephemeris.This method is a pure algebraic method that doesnt need trajectory integral.It has the characteristics of rapidity and high accuracy,and can be used for preliminary design of the lunar satellite transfer trajectory.The time for precise trajectory design will be reduced greatly when parameters gotten from preliminary design is used as the initial value of precise design.

Abstract:Determining the attainability domain of aeroassisted orbital plane change,i. e. the inclination and the longitude of the ascending node,is a very important problem.Using coordinates transformation, the analytic formula calculating the attainable domain with arbitrary initial inclination was obtained in this paper.Because only the inclination change with 0 degree initial inclination is needed,the formula can make the calculation greatly simpler.

Abstract:On evaluating the hitting precision of a missile which throws sub-missiles, it is a key question to estimate the normal distribution parameter of the sub-missile dispersion center. The usual method is, to find a sub-missile disper firstsion center first from each group data of the sub-missile's falling point coordinate, then to estimate the parameters according to a few data of dispersion center using the classical statistic method. Its shortcomings are the high probability to make a wrong conclusion. Considering that the sub-missile dispersion center, which cannot sufficiently express the information contained in the sub-missile falling point data group, is only its first moment, in this paper a new method on fusion estimating the distribution parameter is researched.

Abstract:A new method for measurement of the pitching angle and yaw angle of an axes-symmetric object through the optical images is presented, and the accuracy of the method is analyzed. This method is highly accurate because a large amount of information of the object image is used. The difficulty of object matching among several images is avoided since the object's axis is measured in an indirect way.

Abstract:The time-dependent numerical method is used to solve Navier-Stokes equations and simulate the 2D shockwave planar boundary-layer interaction. In our computation, the high order accuracy WENO schemes are applied to pursuing numerical approximation of the inviscid spatial derivative. To step on time, we make use of the Runge-Kutta methods with property of TVD. The viscous term is discremeted by two-order central difference scheme. The resultant pressure and shear distribution agree with those of the experiments. The numerical practice shows the WENO schemes are robust and strong indeed, and have a vast range of prospects for application.

Abstract:Before launching a meteorological rocket, the fire table must be used for wind correction to the rocket's flight trajectory. The traditional fire table has defects in accuracy and generality. Based on numerical simulation of the flight trajectory and the technology of search and iteration, software fire table determines the launching angle and flight trajectory by satisfying specific requirements at detach point, and makes improvement in accuracy and generality.

Abstract:Cold flow field and simple-reaction flow field of the combustion of HTPB and PS within the solid fuel ramjet (SFRJ) are simulated using PHOENICS program. The result shows that the reattachment point moves forward so that the flow field structure is altered in case of combustion. In case of cold flow, the reattachment point doesn't change with inlet temperature, but it does so in simple-reaction flow field. And it doesn't change with inlet mass flux in both conditions.

Abstract:Using PhBr and BF₃: OEt₂ as the raw materials, the poly(p-phenylene borane) (PPB) is synthesized, After PPB is pyrolyzed in high temperature, the product containing 54.4% B₄C. 32% free canbon and 13.6% B₂O₃ is obtained. If the carbon fiber(Cf) is dipped in the solution of PPB and pyrolyzed in high temperature, the Cf coated by B₄C (B₄C-Cf) is obtained, Comparing with raw Cf in same treat conditions, the tempereture of thermal oxidation resistance of B₄C-Cf has increased by 200℃. The δ₆ of Cf/SiC matrix composites made by using B₄C-Cf 1800℃ is improved 10.5% and the KIC is improved 19.4%. At 1850℃, the δ_ь is improved 31.6% and the KIC is improved 5.8%.

Abstract:The molecular structure of alkanes is described by a novel coding method, recently developed in this laboratory, on the basis of molecular subgraph. It has been shown that there exists very good correlation between the coding and thermodynamical functions of alkanes. The correlation coefficients (R) of MLR equation for quantitative structure property relation (QSPR) on Gibbs energy(△Gf), atomization heat (△H_atm), heat capacity(C_p), evaporating enthalpy (△H_V), enthalpy (△H_f(l)) and entropy (S) are respectively 0.9559, 1.0000, 0.9905, 0.9969,0.9973 and 0.9922. The responding derivation (S) are 4.710, 4.307, 3.793, 0.484, 0.931, 0.585.

Abstract:The parallel row-column method and the parallel polynomial transform algorithm are discussed. The algorithms are analyzed with the LogP model. After detailed analysis of the structure of one-and two-dimensional discrete wavelet transform, the paper proposes parallel algorithms for them. The algorithms need relatively small amount of communication time and are suitable for MPP or workstation clusters. Programs are made for them. Experiments on MPPs show that the algorithms are correct and high speedups are achieved. The methods can also be used for any kind of pyramid a Algorithm in signal processing.

Abstract:The universal console of image displaying (UCID)is used to manage and display information. The functions, specifications and system configure of a new UCID are designed after analyzing the limits of primary console. Moreover, the video bandwidth and crosstalk isolation are described in detail. Finally, the goal of the research on a generation of UCID is forecasted.

Abstract:A new method to measure the terrain roughness is given, which is based on mathematical morphological filter. Compared with the current ones, measurement by this new method is vivid and audio-visual, and simple to calculate. The simulating test results are also given.

Abstract:We first present the parametric model of Radio Frequency Interference (RFI) suppression in Ultra-WideBand Synthetic Aperture Radar (UWB-SAR). Starting from the problem of signal parameter estimation, we deduce in detail the computation formula of RELAX algorithm for real-valued signal. As to the complexity of RFI, a Gradual RELAX (GRELAX) algorithm is proposed. Experiments with synthesized and raw RFI data demonstrate the efficiency of GRELAX in RFI suppression and its high processing speed.

Abstract:Based on the digital oscilloscope and vector network analyzer, two methods of the amplitude and phase error measuring of wide band quadrature demodulator are proposed and compared. They've also been verified in the measurement of a quadrature demodulator of 100MHz band.

Abstract:The NCS System plays an important role in the TES Network. So the NCS operators and managers have to guarantee the reliability and security of the NCS system. In order to improve the operators and managers' qualification and run the TES network well, the simulation training system is developed, by using the up-to-date multimedia, computer, visualization, interactive simulation, RDS and OOP technology, and so on. The simulation training system simulates the NCS System vividly, and the operators and managers are able to learn the real NCS System through it.

Abstract:With the development of multimedia applications, QoS guarantee technology becomes more important. There are different QoS strategies and arithmetic for different types of multimedia applications. It is useful to study how to make the QoS service adapt to the heterogeneous of distributed applications, how to make it easy to change the QoS strategies and arithmetic according to the types of applications. This paper puts forward a QoS manager object model called IQoSM. It provides an entirely QoS manage framework, every module can be developed independently, and work coordinated. With the IQoSM, people can easily change the QoS strategies and arithmetic without wholly reprogramming and redesigning. It is flexible and easy to be reconstructed. It can also work together with CORBA A/V STREAM mechanism.

Abstract:Based on the discrete logarithm, this paper proposes a group signature schemes. The scheme preserves the main merits inherent in previously proposed schemes, and solves the anonymity problem. In the scheme, even though the group authority announces some additional information to provide the verifier with confirmation of the identity of the signer, the anonymity of this signer will be maintained in the other group signatures, and the group authority need not renew any of the keys of this signer. The reason is that announced information is only provided in order to identify the specific group signature.

Abstract:The window mechanism implemented in computer networks is analyzed, and the results are given for Data-Link-layer and network-layer respectively, The selection of parameters in window mechanism is also presented. A specified program flowchart of window mechanism is offered at the end of this paper.

Abstract:Considering the triangulation algorithm based only on the determination of convex-concave vertices is restricted to simple polygons, this paper presents a triangulation algorithm for the general plane polygon GTP(General Triangulation of Polygons) based on determination of convex-concave vertices and connecting the outer border of a polygon with its inner borders. GTP is rapid and can be applied to any plane polygon. GTP has been implemented and acquired good effect in application.

Abstract:The parallelism of quantum computing has shown its great power. However, the reality of the quantum computation enforces the researchers to simulate the quantum algorithms instead of doing research work on the real quantum computers. Based on the elementary theory and the simple model of quantum computation simulation, this paper discusses the techniques of quantum algorithm simulation. And according to the analysis of the space and time consuming of these simulation, we point out some problems in quantum algorithm simulation. we also discussed the techniques for optimizing the quantum algorithm simulation in the future.

Abstract:MEMS is widely considered as one of booming new technologies, and as its typical application, micro-instruments have unparalled advantage compared with traditional instruments, this article outlined the concept, characteristics and its application, some personal viewpoints about micro-instruments are forwarded.

Abstract:This paper describes ultra-precision machining technology together with its application background and the latest development of its key points. The accuracy target and the trend of modularization and low cost are described in detail from the view of spreading application of ultra-precision machining technology. Under the consideration of promoting technology level, the latest achievements in some key technologies are reviewed. These key technologies include modular component, actuating system, measurement technology, CNC system and environment controlling.

Abstract:In order to solve the problem of the test pattern optimal generation in boundary-scan test, a new algorithm, called test matrix compress algorithm, is presented. In the new algorithm, firstly, set up the limited-short-fault-Model applying the structural information of the circuit board on test; then, based on the limited-short-fault-Model, carry out compressing process on the complete test matrix to generate optimal test matrix. The main idea of this algorithm is to remove invalid or redundant information from test matrix to the greatest extent, while keeping the effective test information. Through theoretic analysis and experimental validation, it is proved that the algorithm can get good optimization result and achieve great test information compressing ratio by this algorithm.

Abstract:Let Ube an associative ring with 1, and M a left U-module.We consider the modules by the generalized inverses of homomorphisms, and we classify the modules with the regular inverses of homomorphisms.We make some necessary and sufficient conditions for a module to be direct injective, indecomposable, strongly indecomposable respectively.

Abstract:In this paper it is proved that the π is the predictable dual projection of jump measure ν and is the martingale character of m, where ν= m+ π　is DoobMeyer decomposition of ν.

Abstract:Strong idempotents and strong periodic semigroup are studied, and the relations between the strong period semigroup and strict π regular semigroup are also obtained.

Abstract:A practical method that reduces the dimensions of a high dimensional random vector X=(x₁, x₂,…,x_p)′_p×1 is put forward. Its fundamental idea is, with the sweep operation o f matrix , to structure a few synthetical indexes (called principal variance variables) of X to depict X 's statistical feature. The theoretical foundation, audio-visual explanation and algorithm of the method are given. The method is markedly superior to of principal component analysis especially when X has serious multi-correlation.