List of publications




Journal Articles
Y. Satake, T. Sogabe, T. Kemmochi, S.-L. Zhang,
Matrix equation representation of the convolution equation and its unique solvability,
Special Matrices (accepted)
R. Zhao, T. Sogabe, T. Kemmochi, S.-L. Zhang,
Shifted LOPBiCG: A locally orthogonal product-type method for solving nonsymmetric shifted linear systems based on Bi-CGSTAB,
Numer. Linear Algebra. Appl., 31(2024), e2538.
J. Niu, T. Sogabe, L. Du, T. Kemmochi, S.-L. Zhang,
Tensor product-type methods for solving Sylvester tensor equations,
Appl. Math. Compute, 457 (2023), 128155.
E. Miyazaki, T. Kemmochi, T. Sogabe, S.-L. Zhang,
A structure-preserving numerical method for the fourth-order geometric evolution equations for planar curves,
Commun. Math. Res., 39 (2023), pp. 296-330.
S. Takahira, A. Ohashi, T. Sogabe, T. S. Usuda,
Quantum algorithms based on the block-encoding framework for matrix functions by contour integrals,
Quantum Inform. Comput., 22 (2022), pp. 965-979.
A. Ohashi, T. Sogabe,
Recent development for computing singular values of a generalized tensor sum,
J. Adv. Simul. Sci. Eng. (JASSE), 9 (2022), pp. 136-149.
F. Tatsuoka, T. Sogabe, Y. Miyatake, T. Kemmochi, S.-L. Zhang,
Computing the matrix fractional power based on the double exponential formula,
Electron. Trans. Numer. Anal., 54 (2021), pp. 558-580.
A. Ohashi, T. Sogabe,
Numerical algorithms for computing an arbitrary singular value of a tensor sum,
Axioms 10 (2021), 211. (14pp.)
T. Hoshi, M. Kawamura, K. Yoshimi, Y. Motoyama, T. Misawa, Y. Yamaji, S. Todo, N. Kawashima, T. Sogabe,
Kω -- Open-source library for the shifted Krylov subspace method,
Comput. Phys. Commun., 258 (2021), 107536.
K.-I. Ishikawa, T. Sogabe,
A thick-restart Lanczos type method for Hermitian J-symmetric eigenvalue problems,
Japan J. Ind. Appl. Math., 38 (2021), pp. 233-256.
J. Jia, T. Sogabe,
Generalized Sherman-Morrison-Woodbury formula based algorithm for the inverses of opposite-bordered tridiagonal matrices,
J. Math. Chem., 58 (2020), pp. 1466-1480.
T. Sogabe, A. Suzuki, S.-L. Zhang,
An implicit evaluation method of vector 2-norms arising from sphere constrained quadratic optimizations,
CSIAM Trans. Appl. Math., 1 (2020), pp. 142-154 (Invited)
S. Takahira, A. Ohashi, T. Sogabe, T. S. Usuda,
Quantum algorithm for matrix functions by Cauchy's integral formula,
Quantum Inform. Comput., 20:1-2 (2020), pp. 14-36.
Y. Satake, T. Sogabe, T. Kemmochi, S.-L. Zhang,
On a transformation of the *-congruence Sylvester equation for the least squares optimization,
Optim. Methods & Softw., 35 (2020), pp. 974-981.
F. Tatsuoka, T. Sogabe, Y. Miyatake, S.-L. Zhang,
Algorithms for the computation of the matrix logarithm based on the double exponential formula,
J. Comput. Appl. Math., 373 (2020), 112396.
Y. Miyatake, T. Sogabe, S.-L. Zhang,
Adaptive SOR methods based on the Wolfe conditions,
Numer. Algorithms, 84 (2020), pp. 117-132.
K. Nakano, T. Kemmochi, Y. Miyatake, T. Sogabe, S.-L. Zhang,
Modified Strang splitting for semilinear parabolic problems,
JSIAM Letters, 11 (2019), pp. 77-80.
Y. Miyatake, T. Nakagawa, T. Sogabe, S.-L. Zhang,
A structure-preserving Fourier pseudo-spectral linearly implicit scheme for the space-fractional nonlinear Schrödinger equation,
J. Comput. Dyn., 6 (2019), pp. 361-383.
A. Ohashi, T. Sogabe
On computing the minimum singular value of a tensor sum,
Special Matrices, 7 (2019), pp. 95-106.
Y. Satake, M. Oozawa, T. Sogabe, Y. Miyatake, T. Kemmochi, S.-L. Zhang,
Relation between the T-congruence Sylvester equation and the generalized Sylvester equation,
Appl. Math. Lett., 96 (2019), pp. 7-13.
S. Takahira, T. Sogabe, T. S. Usuda,
Bidiagonalization of (k, k + 1)-tridiagonal matrices,
Special Matrices, 7 (2019), pp. 20-26.
D. Lee, T. Hoshi, T. Sogabe, Y. Miyatake, S.-L. Zhang,
Solution of the k-th eigenvalue problem in large-scale electronic structure calculations,
J. Comput. Phys., 371 (2018), pp. 618-632.
A. Imakura, T. Sogabe, S.-L. Zhang,
A look-back-type restart for the restarted Krylov subspace methods for solving non-Hermitian linear systems,
Japan J. Ind. Appl. Math., 35 (2018), pp. 835-859.
Y. Miyatake, T. Sogabe, S.-L. Zhang,
On the equivalence between SOR-type methods for linear systems and the discrete gradient methods for gradient systems,
J. Comput. Appl. Math., 342 (2018), pp. 58-69.
K. Ooi, Y. Mizuno, T. Sogabe, Y. Yamamoto, S.-L. Zhang,
Solution of a nonlinear eigenvalue problem using signed singular values,
East Asia J. on Appl. Math., 7 (2018), pp. 799-809.
L. Du, T. Sogabe, S.-L. Zhang,
A fast algorithm for solving tridiagonal quasi-Toeplitz linear systems,
Appl. Math. Lett., 75 (2018), pp. 74-81.
M. Oozawa, T. Sogabe, Y. Miyatake, S.-L. Zhang,
On a relationship between the T-congruence sylvester equation and the Lyapunov equation,
J. Comput. Appl. Math., 329 (2018), pp. 51-56.
F. Yilmaz, T. Sogabe, E. Kirklar,
On the pfaffians and determinants of some skew-centrosymmetric matrices,
J. Integer Sequences, 20 (2017), pp. 1-9.
Y. Miyatake, G. Eom, T. Sogabe, S.-L. Zhang,
Energy-preserving H1-Galerkin schemes for the Hunter-Saxton equation,
J. Math. Res. Appl. 37 (2017), pp. 107-118.
F. Tatsuoka, T. Sogabe, Y. Miyatake, S.-L. Zhang
A cost-efficient variant of the incremental Newton iteration for the matrix pth root,
J. Math. Res. Appl. 37 (2017), pp. 97-106.
S. Mizuno, Y. Moriizumi, T. S. Usuda, T. Sogabe,
An initial guess of Newton's method for the matrix square root based on a sphere constrained optimization problem,
JSIAM Letters, 8 (2016), pp. 17-20.
A. Ohashi, T. Sogabe, T. S. Usuda,
Fast block diagonalization of (k, k')-pentadiagonal matrices,
Int. J. Pure and Appl. Math. 106 (2016), pp. 513-523.
C. M. da Fonseca, T. Sogabe, F. Yilmaz,
Lower k-Hessenberg matrices and k-Fibonacci, Fibonacci-p and Pell (p,i) numbers,
Gen. Math. Notes, 31 (2015), pp. 10-17.
A. Ohashi, T. Sogabe,
On computing maximum/minimum singular values of a generalized tensor sum,
Electron. Trans. Numer. Anal., 43 (2015), pp. 244-254.
A. Ohashi, T. S. Usuda, T. Sogabe, F. Yilmaz,
On tensor product decomposition of k-tridiagonal Toeplitz matrices,
Int. J. Pure and Appl. Math., 103 (2015), pp. 537-545.
A. Ohashi, T. Sogabe, T. S. Usuda,
On decomposition of k-tridiagonal l-Toeplitz matrices and its applications,
Special Matrices, 3 (2015), pp. 200-206.
J. Jia, T. Sogabe, S. Li,
A generalized symbolic Thomas algorithm for the solution of opposite-bordered tridiagonal linear systems,
J. Comput. Appl. Math., 290 (2015), pp. 423-432.
C. Wen, T.-Z. Huang, T. Sogabe,
An extension of two conjugate direction methods to Markov chain problems,
Computing and Informatics, 34 (2015), pp. 1001-1022.
L. Du, T. Sogabe, S.-L. Zhang,
IDR(s) for solving shifted nonsymmetric linear systems,
J. Comput. Appl. Math., 274 (2015), pp. 35-43.
X.-M. Gu, T.-Z. Huang, L. Li, H.-B. Li, T Sogabe, M. Clemens,
Quasi-minimal residual variants of the COCG and COCR methods for complex symmetric linear systems in electromagnetic simulations,
IEEE Trans. Microw. Theory Techn., 62 (2014), pp. 2859-2867.
T. Sogabe F. Yilmaz,
A note on a fast breakdown-free algorithm for computing the determinants and the permanents of k-tridiagonal matrices,
Appl. Math. Comput., 249 (2014) pp. 98-102.
F. Yilmaz, T. Sogabe,
A note on symmetric k-tridiagonal matrix family and the Fibonacci numbers,
Int. J. Pure and Appl. Math., 96 (2014), pp. 289-298.
X.-M. Gu, T.-Z. Huang, J. Meng, T. Sogabe, H.-B. Li, and L. Li,
BiCR-type methods for families of shifted linear systems,
Comput. Math. Appl., 68 (2014), pp. 746-758.
L. Du, T. Sogabe, S.-L. Zhang,
An algorithm for solving nonsymmetric penta-diagonal Toeplitz linear systems,
Appl. Math. Comput., 244 (2014) pp. 10-15.
D. J. Lee, T. Miyata, T. Sogabe, T. Hoshi, and S.-L. Zhang,
An interior eigenvalue problem from electronic structure calculations,
Japan J. Ind. Appl. Math., 30 (2013), pp. 625-633.
J. Jia, T. Sogabe,
On particular solution of ordinary differential equations with constant coefficients,
Appl. Math. Comput., 219 (2013), pp. 6761-6767.
J. Jia, T. Sogabe,
A novel algorithm for solving quasi penta-diagonal linear systems,
J. Math. Chem., 51 (2013), pp. 881-889.
A. Imakura, T. Sogabe, S.-L. Zhang,
An efficient variant of the restarted shifted GMRES for solving shifted linear systems,
J. Math. Res. Appl., 33 (2013), pp. 127-141.
J. Jia, T. Sogabe, M.E.A. El-Mikkawy,
Inversion of k-tridiagonal matrices with Toeplitz structure
Comput. Math. Appl., 65 (2013), pp. 116-125
J. Jia, T. Sogabe,
A novel algorithm and its parallelization for solving nearly penta-diagonal linear systems,
Int. J. Comput. Math., 90 (2013), pp. 435-444.
T. Sogabe, T. Hoshi, S.-L. Zhang, T. Fujiwara,
Solution of generalized shifted linear systems with complex symmetric matrices,
J. Comput. Phys., 231(2012), pp. 5669-5684.
J. Jia, Q. Kong, T. Sogabe,
A fast numerical algorithm for solving nearly penta-diagonal linear systems,
Int. J. Comput. Math., 89 (2012), pp. 851-860.
T. Hoshi, S. Yamamoto, T. Fujiwara, T. Sogabe, and S.-L. Zhang,
An order-N electronic structure theory with generalized eigen-value equations and its application to a ten-million-atom system,
J. Phys.: Condens. Matter 24, (2012) 165502, pp. 1-5.
J. Jia, Q. Kong, T. Sogabe,
A new algorithm for solving nearly penta-diagonal Toeplitz linear systems
Comput. Math. Appl., 63 (2012), pp. 1238-1243.
A. Imakura, T. Sogabe, S.-L. Zhang
An efficient variant of the GMRES(m) method based on error equations,
East Asia J. on Appl. Math. 2 (2012), pp.19-32.
T. Sogabe, M.E.A. El-Mikkawy,
Fast block diagonalization of k-tridiagonal matrices,
Appl. Math. Comput., 218 (2011), pp. 2740-2743.
L. Du, T. Sogabe, S.-L. Zhang,
A variant of the IDR(s) method with quasi-minimal residual strategy,
J. Comput. Appl. Math. 236 (2011), pp. 621-630.
L. Du, T. Sogabe, B. Yu, Y. Yamamoto, S.-L. Zhang,
A block IDR(s) method for nonsymmetric linear systems with multiple right-hand sides,
J. Comput. Appl. Math., 235 (2011), pp. 4095-4106.
H. Teng, T. Fujiwara, T. Hoshi, T. Sogabe, S.-L. Zhang, S. Yamamoto,
Efficient and accurate linear algebraic methods for large-scale electronic structure calculations with non-orthogonal atomic orbitals,
Phys. Rev. B 83, 165103 (2011), pp. 1-12.
L. Du, T. Sogabe, S.-L. Zhang,
Quasi-minimal residual smoothing technique for the IDR(s) method,
JSIAM Letters, 3 (2011), pp. 13-16.
T. Sogabe, S.-L. Zhang,
An extension of the COCR method to solving shifted linear systems with complex symmetric matrices
East Asia J. on Appl. Math., 1 (2011), pp. 97-107.
Y. Mizuno, K. Ohi, T. Sogabe, Y. Yamamoto, Y. Kaneda,
Four-point correlation function of a passive scalar field in rapidly fluctuating turbulence: Numerical analysis of an exact closure equation
Phys. Rev. E 82, 036316 (2010), pp.1-9.
M.E.A. El-Mikkawy, T. Sogabe,
A new family of k-Fibonacci numbers,
Appl. Math. Comput. 215 (2010), pp. 4456-4461.
M.E.A. El-Mikkawy and T. Sogabe,
Notes on particular symmetric polynomials with applications,
Appl. Math. Comput., 215 (2010), pp. 3311-3317.
T. Fujiwara, T. Hoshi, S. Yamamoto, T. Sogabe, S.-L. Zhang,
A novel algorithm of large-scale simultaneous linear equations,
J. Phys.: Condens. Matter, 22 (2010), 074206, pp.1-6.
Y.-F. Jing, T.-Z. Huang, Y. Zhang, L. Li, G.-H. Cheng, Z.-G. Ren, Y. Duan, T. Sogabe, B. Carpentieri,
Lanczos-type variants of the COCR method for complex nonsymmetric linear systems,
J. Comput. Phys., 228 (2009), pp. 6376-6394.
T. Sogabe, M.E.A. El-Mikkawy,
On a problem related to the Vandermonde determinant,
Discrete Appl. Math., 157 (2009), pp. 2997-2999.
A. Imakura, T. Sogabe, S.-L. Zhang
An implicit wavelet sparse approximate inverse preconditioner using block finger pattern,
Numer. Linear Algebra. Appl., 16 (2009), pp.915-928.
T. Sogabe, M. Sugihara, S.-L. Zhang,
An extension of the conjugate residual method to nonsymmetric linear systems,
J. Comput. Appl. Math., 226 (2009), pp. 103-113.
T. Sogabe, T. Hoshi, S.-L. Zhang, T. Fujiwara,
On a weighted quasi-residual minimization strategy for solving complex symmetric shifted linear systems,
Electron. Trans. Numer. Anal., 31 (2008), pp. 126-140.
S. Yamamoto, T. Sogabe, T. Hoshi, S.-L. Zhang, T. Fujiwara,
Shifted COCG method and its application to double orbital extended Hubbard model,
J. Phys. Soc. Jpn., Vol. 77, No. 11, 114713 (2008), pp. 1-8.
T. Sogabe,
New algorithms for solving periodic tridiagonal and periodic pentadiagonal linear systems,
Appl. Math. Comput., 202 (2008), pp. 850-856.
T. Sogabe,
A note on ``A fast numerical algorithm for the determinant of a pentadiagonal matrix",
Appl. Math. Comput., 201 (2008), pp. 561-564.
T. Sogabe,
Numerical algorithms for solving comrade linear systems based on tridiagonal solvers,
Appl. Math. Comput., 198 (2008), pp. 117-122.
T. Sogabe,
A fast numerical algorithm for the determinant of a pentadiagonal matrix
Appl. Math. Comput., 196 (2008), pp. 835-841
T. Sogabe,
On a two-term recurrence for the determinant of a general matrix,
Appl. Math. Comput., 187 (2007), pp. 785-788.
T. Sogabe, S.-L. Zhang,
A COCR method for solving complex symmetric linear systems,
J. Comput. Appl. Math., 199 (2007), pp. 297-303.
R. Takayama, T. Hoshi, T. Sogabe, S.-L. Zhang, T. Fujiwara,
Linear algebraic calculation of Green's function for large-scale electronic structure theory,
Phys. Rev. B 73, 165108 (2006), pp. 1-9.



Book chapters
T. Sogabe, T. Hoshi, S.-L. Zhang, T. Fujiwara,
A numerical method for calculating the Green's function arising from electronic structure theory,
in: Frontiers of Computational Science, eds. Y. Kaneda, H. Kawamura and M. Sasai,
Springer-Verlag, Berlin/Heidelberg, 2007, pp. 189-195.
T. Sogabe, S.-L. Zhang,
An iterative method based on an A-biorthogonalization process for nonsymmetric linear systems,
in: Proceedings of The 7th China-Japan Seminar on Numerical Mathematics, ed. Z.-C. Shi and H. Okamoto,
Science Press, Beijing, 2006, pp. 120-130.
T. Sogabe, S.-L. Zhang,
Extended conjugate residual methods for solving nonsymmetric linear systems,
in: Numerical Linear Algebra and Optimization, ed. Y. Yuan, Science Press, Beijing/NewYork, 2004, pp. 88-99.



Book

   Krylov Subspace Methods for Linear Systems —Principles of Algorithms
   Spiringer Series in Computational Mathematics, Springer, 2023.

   Series Editors: Randolph E. Bank, Wolfgang Hackbusch, Josef Stoer, and Harry Yserentant