| Co-Investigator(Kenkyū-buntansha) |
CAI Dongsheng Univ of Tsukuba, Inst. Of Info. Sci. and Eng, Associate Professor, 電子・情報工学系, 助教授 (70202075)
ONO Hideo Meisei Univ., General Education, Professor, 一般教育, 教授 (00062315)
HIROTSU Chihiro Meisei Univ., General Education, Professor, 一般教育, 教授 (60016730)
MIYAZAKI Yoshinnori Shizuoka Sangyo Univ., Faculty of Communications and Informatics, Assistant Professor, 国際情報学部, 講師 (00308701)
ASAI Nobuyoshi Univ of Aizu, Faculty of Comp. Sci. and Eng., Assistant Professor, コンピュータ理工学部, 講師 (80325969)
菊池 靖 会津大学, コンピュータ理工学部, 講師 (60254059)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2002: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2001: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Research Abstract |
The authors have conducted the research in detail on the eigenvalue problems of infinite complex band matrices, gaining the proof of the computability of approximated eigenvalues as well as its accurate error estimate formula, by an extremely natural truncation method. For more details, refer to
1. Y. Ikebe, Y. Kikuchi, I. Fujishiro, N. Asai, K. Takanashi, and M. Harada, The Eigenvalue Problem for Infinite Compact Complex Symmetric Matrices with Application to the Numerical Computation of Complex Zeros of J_0(z) -iJ_1(z) and of Bessel Functions J_m(z) of Any Real Order m, Linear Algebra and Its Applications, Vol. 194(1993), pp. 35-70
2. Y. Ikebe, N. Asai, Y. Miyazaki, and D. Cai, The Eigenvalue Problem for Infinite Complex Symmetric Tridiagonal Matrices with Application, Linear Algebra and Its Applications, Vol. 241-243(combined volume) (1996), pp.599-618
On the other hand, transforming the three-dimensional wave equation Δw + p^2w = 0 by the spheroidal coordinates (there are two kinds, o
… More
r prolate type and oblate type), and executing the method of separation of variables give w"-tanθ・w' + (λ-μ^2 sec^2θ+γcos^2θ)w = 0, which is widely called spheroidal wave equations. The formulation, error estimate, as well as their visualization were attempted, by matrix method, as an application of the numerical commutation mentioned above.
Alternatively, in analogy with the solution of Mathieu differential equation, which produced considerably significant results concerning the computation of eigenvalues up to the present, the authors handled the solution of Lame equation w"(z) ― (a + bk^2 sn^2 z)W(Z) = 0, also from the standpoint of the application stated earlier for its eigenvalues such that periodic Lame function has the period of 2π or 4π. Again, formulation, error estimate along with their visualization were obtained. Lastly, let us note that an ongoing project for solving the eigenvalues of ellipsoidal wave equation is also under investigation, whose related literature is seldom found. Less
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