In this paper, we review some recent developments on the study of implicitly defined curves and surfaces in the field of computer aided geometric design(CAGD), includ-ing mainly the research on the problems of paramet...
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In this paper, we review some recent developments on the study of implicitly defined curves and surfaces in the field of computer aided geometric design(CAGD), includ-ing mainly the research on the problems of parametrization, regularity and splines of algebraic curves and surfaces.
In this paper, based on the natural boundary reduction suggested by Feng and Yu,an overlapping domain decomposition method for harmonic boundary value problerns on the unbounded sector domain or the unbounded cracked ...
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In this paper, based on the natural boundary reduction suggested by Feng and Yu,an overlapping domain decomposition method for harmonic boundary value problerns on the unbounded sector domain or the unbounded cracked domain is discussed. The numerical examples show that this discrete Schwarz iteration is geometric *** the convergence rate of this method is independent of the finite element mesh size,but dependent on the frequency of the exact solution and the overlaPping degree of thesubdomains.
A predictor-correct interior point method is presented for solving convex quadraticprogramming problem with box constraints in this paper. Actually, the method isequivalent to solve a system of equations-the first ord...
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A predictor-correct interior point method is presented for solving convex quadraticprogramming problem with box constraints in this paper. Actually, the method isequivalent to solve a system of equations-the first order optimality conditions of theproblem by decomposing one Newton step with one simplified Newton step, and hasa nice convergent property with high order. Moreover, the center direction generatedby introducing the barrier parameter is used to correct the descent Newton directionsuch that the search direction which consists of the center and Newton direction avoidshitting the board of the feasible region. Therefore, the iterative sequence generated bythe algorithm is remained inside of the feasible region and converges to the optimalsolution. The numerical results for a group of test problems are also given, and haveshown that the algorithm works very efficiently.
In this paper, we apply the natural boundary element method to solve initialboundary value problem of parabolic equation. By Fourier expansion, we obtainthe natural integral equation of the problem and its Poisson int...
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In this paper, we apply the natural boundary element method to solve initialboundary value problem of parabolic equation. By Fourier expansion, we obtainthe natural integral equation of the problem and its Poisson integral formula overexterior circular domain. Meanwhile, the numerical implementation of the natural integral equation is given. At last some numerical examples are presented toillustrate feasibility and efficiency of our method.
In this paper we present a set of absorbing boundary conditions based on the higher order approximations of one-way wave equations. By introducing new functions, these absorbing boundary conditions are put into the fo...
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In this paper we present a set of absorbing boundary conditions based on the higher order approximations of one-way wave equations. By introducing new functions, these absorbing boundary conditions are put into the form of systems of lower order partial differential equations. The stability of initial boundary value problems with these type of boundary conditions is discussed. The energy estimates for their solutions are obtained.
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