共查询到20条相似文献,搜索用时 15 毫秒
1.
The exponential Radon transform, a generalization of the Radon transform, is defined and studied as a mapping of function
spaces. It is represented in terms of Fourier transform of its domain and range, and this leads to the harmonic decomposition
reconstruction. The results are similar results of Tretiak and Metz.
Foundation item: Supported by the National Natural Science Foundation of China (No. 19971064), Key Project of Science and
Technology of Hubei Province Education Committee.
Biography: Wang Jin-ping (1963-), male, Ph.D. candidate, research direction: numberical solution of singular integral equation
and integral transformation etc. 相似文献
2.
We study the exact formal solution to the simplified Keller-Segel system modelling chemotaxis. The method we use is series
expanding. The main result is to attain the formal solution to the simplified Keller-Segel system.
Foundation item: Supported by the National Natural Science Foundation of China(No. 10025107)
Biography: Chen Hua(1956-), male, Professor, research direction: partial differential equations. 相似文献
3.
We consider an iterative algorithm of mesh optimization for finite element solution, and give an improved moving mesh strategy
that reduces rapidly the complexity and cost of solving variational problems. A numerical result is presented for a 2-dimensional
problem by the improved algorithm.
Foundation item: Supported by the National Natural Science Foundation of China(No. 19771062)
Biography: Cheng Jian(1977-), male, Master candidate, research interests: the numerical solution of PDE. 相似文献
4.
The approximation solvability of the abstract differential inclusion du/dt∈f(t,u) is presented. The convergence of the approximation solution and the existence of the solution for abstract evolution multivalued
problem are discussed.
Foundation item: Supported by the National Natural Science Foundation of China (No. 19771062)
Biography: Xia Jin-sheng (1975-), Ph.D candidate, research interest: the approximate solution of differential equation. 相似文献
5.
A novel cellulose hydrogel is prepared by regenerating cellulose from its ionic liquid solution. The transparency cellulose
hydrogel presents a good chemical stability and an acceptable mechanical property. This non-toxic cellulose hydrogel should
be biocompatible and may be useful in the future as a biomaterial.
Supported by the National Natural Science Foundation of China (Grant No. 20604017) and Scientific Research Foundation for
the Returned Overseas Chinese Scholars, Ministry of Education of China 相似文献
6.
Yu Chang-an 《武汉大学学报:自然科学英文版》1999,4(3):256-260
In this paper, we obtain an explicit formula of general solution for a class of the homogeneous recurrence of variable coefficients
with two indices.
Foundation item: Supported by the National Natural Science Foundation of China(19771063)
Biography: YU Chang-an(1948-), male, Professor, Current research interest is in combinatorial theory 相似文献
7.
YAN Zizong FEI Pusheng WANG Xiaoli 《武汉大学学报:自然科学英文版》2006,11(3):493-497
This paper discusses a re-examinatlon of dual methods based on Gomory's cutting plane for the solution of the integer programming problem, in which the increment of objection function is allowed as a pivot variable to decide the search direction and stepsize. Meanwhile, we adopt the current equivalent face technique so that lattices are found in the discrete integral face and stronger valid inequalities are acquired easily. 相似文献
8.
The interior Radon transform arises from a limited data problem in computerized tomography. The corresponding operator R is
investigated as a mapping between wightedL
2-spaces. Our result is the explicit construction of a singular value decomposition for R. This immediately leads to an inversion
formula by series expansion and range characterizations.
Foundation item: Supported by the Foundation of the Ministry of Education of China and the Science Foundation of Wuhan University
Biography: WANG Jin-ping (1963-), male, Ph.D candidate, Research interests are in numerical solution of singular integral
equation and integral transformation. 相似文献
9.
Hu Jia-yuan 《武汉大学学报:自然科学英文版》1999,4(2):201-204
The adaptive array antenna may be considered as a general sidelobe canceller. Directional interference suppression is based
on a recursive state estimation of Kalman filter. For the stationary filter, this leads to an iterative solution of Wiener-Hops
matrix equation. The performance of sidelobe canceller are studied by computer simulation. The result of simulation, shows
that the sidelobe canceller may be regarded as a special case of an adaptive array atenna.
Foundation item: Supported by the Natural Science Foundation of Hubei Province (98J074)
Biography: Hu Jia-yuan (1941-), male, Associate professor. Research direction: smart antenna, software radio. 相似文献
10.
Utilizing the tool of beam propagation method (BPM) to calculate the zeroth order diffraction beam intensity, we find SVHG
displays notched diffraction response as a function of the readout wavelength. Using the method of SA and considering the
variance of refractive index as the readout wavelength changes, a practiced notch filter can be designed and the period of
the filter is discussed.
Foundation item: Supported by the National Natural Science Foundation of China (69607005)
Biography: LI Xiang-yang (1974-), male, Master candidate: Research direction: message optics. 相似文献
11.
ZHANG Tao SHEN Mei-e YING Shi YE Peng LIANG Zao-qing 《武汉大学学报:自然科学英文版》2005,10(6):971-976
Describing Service-Oriented Architecture (SOA) is critical in the development of Web based system, in this paper, an approach for describing SOA by extended Darwin is proposed. The requirements for describing SOA, which are different from that of ordinary architecture, are highlighted firstly, and then a solution for extending Darwin is presented. Using the extended Darwin, service components and connectors can be described explicit by the extended construct, as well as precise operational semantics of SOA by the π-calculus. Finally an example of supply-chain management system is given for manifesting the effect of the extended Darwin. 相似文献
12.
On a kind of biharmonic boundary value problems related to clamped elastic thin plates 总被引:1,自引:0,他引:1
Lu Jian-ke 《武汉大学学报:自然科学英文版》1999,4(3):251-255
By using complex variable methods, the boundary value problem for biharmonic functions arisen from the theory of clamped elastic
thin plate is shown to be equivalent to the first fundamental problem in plane elasticity which, as well-known, may be easily
solved by reduction to a Fredholm integral equation. The case of circular plate is illustrated in detail, the solution of
which is obtained in closed form.
Foundation item: Supported by the National Natural Science Foundation of China (No. 19871064)
Biography: LU Jian-ke(1922-), male, Professor. Research interests are in applications of complex variables. 相似文献
13.
The purpose of this paper is to present a new general approach to solve ground-state energies of the double-electron systems
in a uniform magnetic field, in which the basic element of evolution is the set in the solution space, rather than the point.
The paper defines the Cell Evolutionary Algorithm, which implements such a view of the evolution mechanism. First, the optimal
set in which the optimal solution may be obtained. Then this approach applies the embedded search method to get the optimal
solution. We tested this approach on the atomic structure, and the results show that it can improve not only the efficiency
but also the accuracy of the calculations as it relates to this specific problem.
Foundation item: Supported by the opening Foundation of state key Laboratory of Magnetic Resonance and Atomic and Molecular
physics, Wuhan Institute of physics, Chinese Academy of Science (981510)
Biography: Liu Lian-jun(1946-), female, Associate professor, research direction: atom and molecular physics. 相似文献
14.
Yu Chang-an 《武汉大学学报:自然科学英文版》2000,5(4):379-385
In this paper, we obtain an explicit formula of general solution for a class of the non-homogeneous recurrence of variable
coefficients with two indices.
Foundation item: Supported by the National Natural Science Foundation of China (19771063)
Biography: Yu Chang-an(1948-), male, Professor, research interest: combinatorial theory. 相似文献
15.
In this paper, we have proved some special properties of singular integral operators which are transformed from the singular
integral equation defined in the interval (−1, 1), i.e., the properties of singular intergral operators at the endpoints and
in the inner of (−1, 1).
Foundation item: Supported by the Science Foundation of SEC of China and Foundation of Wuhan University.
Biography: GONG Ya-fang (1973-), male, Ph. D candidate. Current research interest is in numerical solution of singular integral
equation. 相似文献
16.
YAN Fei ZHANG Huanguo SUN Qi SHEN Zhidong ZHANG Liqiang QIANG Weizhong 《武汉大学学报:自然科学英文版》2006,11(6):1805-1808
Current delegation mechanism of grid security infrastructure (GSI) can't satisfy the requirement of dynamic, distributed and practical security in grid virtual organization. To improve this situation, a TC-enabled GSI is discussed in this paper. With TC-enabled GSI, a practical delegation solution is proposed in this paper through enforcing fine granularity policy over distributed platforms with the emerging trusted computing technologies. Here trusted platform module is treated as a tamper-resistance module to improve grid security infrastructure. With the implement of Project Daonity, it is demonstrated that the solution could gain dynamic and distributed security in grid environment. 相似文献
17.
This paper is concerned with the numerical solution, and with the detection of singularity for a singularly perturbed elliptic
boundary value problems in two space dimensions. Specifically, a wavelet-collocation method is presented for a 2-D linear
reaction-diffusion model. By using two-dimensional B-splinewavelet, we test the efficiency of the method.
Foundation item: Supported by the National Natural Science Foundation of China (19602014)
Biography: Zhang Ai-qing (1974-), female, Master candidate, research interest: wavelet analysis & application. 相似文献
18.
WU Shuhua ZHU Yuefei 《武汉大学学报:自然科学英文版》2006,11(6):1433-1436
This paper, focusing on the trusted computing group's standards, explained the key concept of trusted compuling and provided the architecture of trusted PC. It built trust bottom-up by starting with trusted hardware and adding layers of trusted software. It is a system-level solution available to all applications running on the member platforms. This solution reduces the security burden on applications and thus simplifies application programming. 相似文献
19.
As a kind of parallel storage system, RAID5 has been becoming a popular solution for providing better performance at low cost
and without sacrificing much redundant data, its main disadvantage is poor performance. It is a general method to improve
RAID5 performance by using cache. However, it often happens that the data is not hit in cache, in this case, the RAID5 performance
also will be very poor. The method based on combination of disk I/O operations has been proposed for impriving the I/O response
time through reducing the number of low-level operations. According to theoretic analysis and experimental test, we find that
RAID5 access time and data transfer rate could be largely improved than conventional method.
Foundation item: Supported by the National Natural Science Foundation of China under grant 69773046 and (69973017), and Defense
Advanced Research Foundation of China under grant (98J15. 1. 1. JW0516)
Biography, Chen Qiong (1963-), female, Ph. D candidate, research interests: computer architecture, parallel processing, disk
arrays. 相似文献
20.
GUO Chengcheng ZHANG Li YAN Puliu 《武汉大学学报:自然科学英文版》2006,11(3):585-590
The Web cluster has been a popular solution of network server system because of its scalability and cost effective ness. The cache configured in servers can result in increasing significantly performance, In this paper, we discuss the suitable configuration strategies for caching dynamic content by our experimental results. Considering the system itself can provide support for caching static Web page, such as computer memory cache and disk's own cache, we adopt a special pattern that only caches dynamic Web page in some experiments to enlarge cache space. The paper is introduced three different replacement algorithms in our cache proxy module to test the practical effects of caching dynamic pages under different conditions. The paper is chiefly analyzed the influences of generated time and accessed frequency on caching dynamic Web pages. The paper is also provided the detailed experiment results and main conclusions in the paper. 相似文献