Faculty Information - Okayama Tomoaki |

Okayama Tomoaki

Department / Course

Hiroshima City University Graduate School Graduate School of Information Sciences Major in Systems Engineering

Hiroshima City University Faculty of Information Sciences Department of Systems Engineering

Job Associate Professor

Academic conference presentation
2025/05/26	Sinc approximation combined with the double-exponential transformation for unilateral rapidly decreasing functions (Third International Conference on Mathematical And Computational Modelling, Approximation and Simulation)
2025/03/07	Simple variable transformation for the trapezoidal formula for infinite integrals of unilateral rapidly decreasing functions (JSIAM 2025 Meeting of the Union of Research Activity Groups)
2025/03/05	Improvement of the conformal map combined with the Sinc approximation for derivatives of exponentially decaying functions over the semi-infinite interval (JSIAM 2025 Meeting of the Union of Research Activity Groups)
2025/03/05	Improvement of the conformal map combined with the Sinc approximation for derivatives of unilateral rapidly decreasing functions (JSIAM 2025 Meeting of the Union of Research Activity Groups)
2024/09/18	Theoretical analysis of Sinc-collocation methods for Volterra-Fredholm integral equations (Numerical Analysis & Modelling in Applied Sciences 2024)
2024/03/06	Theoretical error bounds of the SE and DE formulas for integrals of exponentially decaying functions with logarithmic singularity over the semi-infinite interval (JSIAM 2024 Meeting of the Union of Research Activity Groups)
2024/03/06	Theoretical error bounds of the SE and DE formulas for integrals of polynomially decaying functions with logarithmic singularity over the semi-infinite interval (JSIAM 2024 Meeting of the Union of Research Activity Groups)
2024/03/06	Improvement of theoretical error bounds of the SE and DE formulas for integrals with logarithmic singularity over the finite interval (JSIAM 2024 Meeting of the Union of Research Activity Groups)
2023/08/24	Approximate formula for indefinite convolutions by the DE-Sinc method (10th International Congress on Industrial and Applied Mathematics)
2023/06/01	Error analyses of Sinc-collocation methods for exponential decay initial value problems (Second International Conference on Mathematical And Computational Modelling, Approximation and Simulation)
2023/03/09	Approximation of derivatives over the semi-infinite interval by means of the Sinc approximation combined with the DE transformation and its theoretical error estimate (JSIAM 2023 Meeting of the Union of Research Activity Groups)
2023/03/09	Approximation of derivatives over the finite interval by means of the Sinc approximation combined with the DE transformation and its theoretical error estimate (JSIAM 2023 Meeting of the Union of Research Activity Groups)
2022/12/14	Corrected error bound for the real gamma function using the DE formula (The 2022 International Symposium on Nonlinear Theory and its Applications)
2022/09/09	Error estimate of approximation of derivatives by means of the Sinc approximation for double-exponentially decaying functions (The 2022 Annual Meeting of JSIAM)
2022/07/06	Sinc-collocation methods with consistent collocation points for Fredholm integral equations of the second kind (International Conference on Functional Analysis, Approximation Theory and Numerical Analysis)
2022/03/08	Improvement of selection formulas of mesh size and truncation numbers for the DE formula and its theoretical error estimate (JSIAM 2022 Meeting of the Union of Research Activity Groups)
2021/09/13	Improvement of selection formulas of mesh size and truncation number for the DE-Sinc approximation and its theoretical error bound (The 19th International Symposium on Scientific Computing, Computer Arithmetic, and Verified Numerical Computations)
2021/09/09	Yet another Sinc indefinite integration formula (5th Dolomites Workshop on Constructive Approximation and Applications)
2021/03/05	Improvement of selection formulas of mesh size and truncation numbers for the DE-Sinc approximation and its theoretical error estimate (JSIAM 2021 Meeting of the Union of Research Activity Groups)
2021/03/05	Theoretical comparison of two conformal maps combined with the trapezoidal formula for the semi-infinite integral of exponentially decaying functions (JSIAM 2020 Meeting of the Union of Research Activity Groups)
2020/11/20	Sinc-collocation methods for exponential decay initial value problems (The 2020 International Symposium on Nonlinear Theory and its Applications)
2020/09/08	Double-exponential formula for infinite integrals of unilateral rapidly decreasing functions (The 2020 Annual Meeting of JSIAM)
2020/03/05	Improvement of the SE-Sinc approximation for unilateral rapidly decreasing functions and its theoretical error estimate (JSIAM 2020 Meeting of the Union of Research Activity Groups)
2020/03/05	Improvement of theoretical error estimate for the SE formula by Tsuruta et al. for infinite integrals of unilateral rapidly decreasing functions (JSIAM 2020 Meeting of the Union of Research Activity Groups)
2019/09/11	A modified Stenger's quadrature formula for infinite integrals of unilateral rapidly decreasing functions and its theoretical error bound (Mathematical and Computational Modelling, Approximation and Simulation 2019)
2019/09/04	Improvement of theoretical error estimate of the double-exponential formula (The 2019 Annual Meeting of JSIAM)
2018/09/18	Numerical algorithm for sine integral with verification (The 37th JSST Annual International Conference on Simulation Technology)
2018/09/14	A note on computing the pth root of Sinc matrices (16th International Conference of Numerical Analysis and Applied Mathematics)
2018/09/14	Verified algorithm for the sine integral (The 18th International Symposium on Scientific Computing, Computer Arithmetic, and Verified Numerical Computations)
2018/09/06	Improvement of Sinc-Nyström methods for initial value problems (The 2018 International Symposium on Nonlinear Theory and its Applications)
2018/07/05	New conformal map for the Sinc approximation for exponentially-decaying functions over the semi-infinite interval (Numerical Analysis and Scientific Computation with Applications 2018)
2018/06/08	Error analysis of Sinc-Nyström methods for initial value problems of ordinary differential equations (The 47th Numerical Analysis Symposium 2018 (NAS2018))
2018/03/16	Improvement of the SE formula for infinite integrals of unilateral rapidly decreasing functions and its theoretical error estimate (JSIAM 2018 Meeting of the Union of Research Activity Groups)
2018/03/15	Improvement of the DE-Sinc-Nyström method for initial value problems of ordinary differential equations (JSIAM 2018 Meeting of the Union of Research Activity Groups)
2017/12/07	Explicit error bound for Muhammad-Mori's SE-Sinc indefinite integration formula over the semi-infinite interval (The 2017 International Symposium on Nonlinear Theory and its Applications)
2017/10/26	Verified algorithm for the gamma function using double exponential formula and its applications (The 36th JSST Annual International Conference on Simulation Technology)
2017/09/08	Improvement of the SE-Sinc-Nyström method for initial value problems of ordinary differential equations (The 2017 Annual Meeting of JSIAM)
2017/09/06	Improvement of the SE-Sinc approximation with boundary treatment over the semi-infinite interval and its error estimate (The 2017 Annual Meeting of JSIAM)
2017/05/18	Verified error bounds for the gamma function using double exponential formula (International Workshop on Industrial Mathematics / ICIAM Board Meeting 2017)
2017/03/18	Recent development of variable transformations combined with the trapezoidal formula (International Workshop on Numerical Verification and its Applications 2017)
2017/03/18	Verified error bounds for the modified Bessel function of the second kind using double exponential formula over semi-infinite interval (International Workshop on Numerical Verification and its Applications 2017)
2017/03/07	Error estimate with explicit constants for Muhammad--Mori's SE-Sinc indefinite integration formula (JSIAM 2017 Meeting of the Union of Research Activity Groups)
2017/03/07	Improvement of the SE transformation for the Sinc approximation over the semi-infinite interval and its theoretical error estimate (JSIAM 2017 Meeting of the Union of Research Activity Groups)
2016/09/12	Comparison of two optimal function approximation formulas on a weighted Hardy space on an eye-shaped domain (The 2016 Annual Meeting of JSIAM)
2016/09/12	Designing a highly accurate numerical integration formula on a weighted Hardy space (The 2016 Annual Meeting of JSIAM)
2016/06/21	Potential theoretic approach to approximation in weighted Hardy spaces (The 11th East Asia SIAM Conference)
2016/06/09	Error estimates with explicit constants for the Sinc approximation over infinite intervals (5th European Seminar on Computing)
2016/06/09	Verified algorithm for the modified Bessel function of the second kind (5th European Seminar on Computing)
2016/03/05	Verified algorithm for the modified Bessel function using the double exponential formula (JSIAM 2016 Meeting of the Union of Research Activity Groups)
2016/01/09	Ranking of teams in a Kendo team tournament by the two step method (The 19th Symposium of Setouchi-rim JSIAM Local Research Group)
2015/11/12	Explicit error bound for modified numerical iterated integration by means of Sinc methods (6th International Conference on Mathematical Aspects of Computer and Information Sciences)
2015/11/12	Verified error bounds for the real gamma function using double exponential formula over semi-infinite interval (6th International Conference on Mathematical Aspects of Computer and Information Sciences)
2015/09/11	A note on the trapezoidal rule combined with the polar coordinates transformation and the DE transformation for two-dimensional infinite integration (The 2015 Annual Meeting of JSIAM)
2015/08/25	Potential theoretic approach to design an optimal formula for function approximation in a weighted Hardy space (New Directions in Numerical Computation)
2015/06/08	Designing an optimal interpolation formula on a weighted Hardy space using potential theory (The 44th Numerical Analysis Symposium)
2015/03/07	Error estimates with explicit constants for the SE formula of Muhammad–Mori (JSIAM 2015 Meeting of the Union of Research Activity Groups)
2014/09/24	Improvement of a Sinc-collocation method for Fredholm integro-differential equations (12th International Conference of Numerical Analysis and Applied Mathematics)
2013/12/19	A posteriori error estimates of Sinc-collocation methods for Fredholm integral equations of the second kind (Joint Conference on Applied Mathematics 2013)
2013/09/17	Sinc-collocation methods for Volterra integro-differential equations (International Conference on Scientific Computation and Differential Equations 2013)
2013/09/09	On convergence of DE-Sinc methods for the function classes for which SE-Sinc methods are suitable (The 2013 Annual Meeting of JSIAM)
2013/06/14	Sinc-Nyström methods for Fredholm integro-differential equations and their theoretical analysis (The 42st Numerical Analysis Symposium 2013)
2013/05/29	Theoretical analysis of a Sinc-Nyström method for Volterra integro-differential equations and its improvement (18th International Conference Mathematical Modelling and Analysis and Fourth International Conference Approximation Methods and Orthogonal Expansions)
2013/03/15	Error estimates with explicit constants for the tanh rule and the DE formula for integrals with logarithmic singularity (JSIAM 2013 Meeting of the Union of Research Activity Groups)
2012/12/20	Error estimates with explicit constants for numerical iterated integration by means of Sinc quadrature and Sinc indefinite integration (Joint Conference on Applied Mathematics 2012)
2012/09/27	Error estimates with explicit constants for Sinc quadrature and Sinc indefinite integration over infinite intervals (The 15th GAMM-IMACS International Symposium on Scientific Computing, Computer Arithmetic and Validated Numerics)
2012/08/31	Error estimates with explicit constants for the Sinc approximation over infinite intervals (The 2012 Annual Meeting of JSIAM)
2012/07/11	Sinc-collocation method for initial value problems by means of the DE transformation (The 16th International Congress on Computational and Applied Mathematics)
2012/06/07	Sinc-collocation methods for initial value problems of fractional differential equations (The 41st Numerical Analysis Symposium 2012)
2012/03/09	Sinc-collocation methods for Volterra integro-differential equations and their theoretical analysis (JSIAM 2012 Meeting of the Union of Research Activity Groups)
2011/12/17	Improvement and theoretical analysis of Sinc-Nyström methods for Volterra integro-differential equations (Joint Conference on Applied Mathematics 2011)
2011/11/16	Numerical integration formula with a variable transformation and its developments (The 4th Mathematical Science Seminar)
2011/10/26	Optimal function approximation formula based on the generalized Ganelius theorem (Workshop in Research Institute for Mathematical Sciences: "The latest developments in theory and application on scientific computation")
2011/06/29	Theoretical analysis of Sinc-collocation methods for weakly singular Volterra integral equations of the second kind (24th Biennial Conference on Numerical Analysis)
2011/06/20	Modified Sinc-collocation methods for Fredholm integro-differential equations and their theoretical analysis (The 40th Numerical Analysis Symposium 2011)
2011/03/08	On boundedness of the condition number of coefficient matrices generated in Sinc-Nyström methods for Fredholm integral equations of the second kind (JSIAM 2011 Meeting of the Union of Research Activity Groups)
2011/01/29	On tuning parameters of Sinc-Nyström methods for integral equations of the second kind (Kunitachi One-Day Symposium on Numerical Analysis and Related Topics)
2010/12/16	Comparison among a variety of Sinc schemes for initial value problems of ODEs (Joint Conference on Applied Mathematics 2010)
2010/10/26	Theoretical analysis of Sinc schemes for integral equations of the second kind (UT Numerical Analysis Seminar)
2010/09/27	A posteriori error estimates of Sinc-Nyström methods for Fredholm integral equations of the second kind (The 14th GAMM-IMACS International Symposium on Scientific Computing, Computer Arithmetic and Validated Numerics)
2010/09/06	Error estimates with explicit constants for the SE formula and DE formula over infinite intervals (The 2010 Annual Meeting of JSIAM)
2010/06/22	Theoretical analysis of Sinc-Nyström methods for Volterra integral equations of the second kind (The 4th International Conference Computational Methods in Applied Mathematics)
2010/05/26	Error analysis of the DE formula for a class of functions for which the tanh rule is suitable (The 39th Numerical Analysis Symposium 2010)
2010/03/09	A priori and a posteriori error estimates of Sinc-Nyström methods for Fredholm integral equations of the second kind (JSIAM 2010 Meeting of the Union of Research Activity Groups)
2009/12/17	Error estimates with explicit constants for Sinc-Nyström methods for Fredholm integral equations of the second kind (Joint Conference on Applied Mathematics 2009)
2009/10/02	Modified Sinc-collocation methods for Volterra integral equations of the second kind and their theoretical analysis (The 14th International Congress on Computational and Applied Mathematics)
2009/09/07	Improvement of a Sinc-collocation method for Fredholm integral equations of the second kind (2nd Dolomites Workshop on Constructive Approximation and Applications)
2009/07/08	A fast automatic integration algorithm using double exponential formula based on verification theory (The 24th International Technical Conference on Circuits/Systems, Computers and Communications)
2009/06/16	Error estimates with explicit constants for numerical indefinite integration using the tanh rule and the DE formula (The 38th Numerical Analysis Symposium 2009)
2009/06/15	A fast automatic integration algorithm using double exponential formula based on verification theory (The 38th Numerical Analysis Symposium 2009)
2009/06/08	A fast automatic integration algorithm using double exponential formula (The 2nd International Conference on Mathematical Modelling and Computation and The 5th East Asia SIAM Conference)
2009/03/25	Error estimates with explicit constants for Sinc approximation, Sinc quadrature and Sinc indefinite integration (International Workshop on Numerical Verification and its Applications 2009)
2009/03/08	Error estimates with explicit constants for Sinc approximation, Sinc quadrature and Sinc indefinite integration (JSIAM 2009 Meeting of the Union of Research Activity Groups)
2009/01/17	Improvement of fast verified automatic integration using double exponential formula (The 2nd High-Tech Research Symposium)
2008/12/17	Theoretical analysis of Sinc-Nyström methods for Volterra integral equations of the second kind (Joint Conference on Applied Mathematics 2008)
2008/11/14	Improvement of fast verified automatic integration using double exponential formula (Workshop in Research Institute for Mathematical Sciences: "Numerical Analysis: Theory, Methods, and Applications")
2008/11/14	Sinc methods for integral equations of the second kind and their theoretical analysis (Workshop in Research Institute for Mathematical Sciences: "Numerical Analysis: Theory, Methods, and Applications")
2008/11/12	Fast verified automatic integration using double exponential formula (The 4th Symposium on "Innovation of Simulation Technology and Construction of Bases for Practical Applications)
2008/10/13	Approximate formulae for fractional derivatives by means of Sinc methods (International Conference on Applied Mathematics and Approximation Theory 2008)
2008/09/19	Theoretical analysis of Sinc-Nyström methods for Fredholm integral equations of the second kind (The 2008 Annual Meeting of JSIAM)
2008/07/11	Sinc-collocation methods for weakly singular Fredholm integral equations of the second kind (The 13th International Congress on Computational and Applied Mathematics)
2008/06/14	Uniform approximation of fractional derivatives by means of Sinc methods (The 37th Numerical Analysis Symposium 2008)
2008/03/03	Theoretical analysis of Sinc-collocation methods for integral equations of the second kind and applications of the DE transformation (JSIAM 2008 Meeting of the Union of Research Activity Groups)
2007/12/19	Theoretical analysis of numerical methods based on Sinc-collocation for integral equations of the second kind (Joint Conference on Applied Mathematics 2007)
2007/09/17	Theoretical analysis of the Sinc numerical method for weakly singular integral equations of the second kind (The 2007 Annual Meeting of JSIAM)
2007/06/21	Sinc numerical method for Fredholm integral equations of the second kind with a weakly singular kernel (The 36th Numerical Analysis Symposium 2007)
2006/09/18	Approximate formula for indefinite convolutions by the DE-Sinc method (The 2006 Annual Meeting of JSIAM)
2005/09/06	Fractional Calculus (JSIAM Summer Seminar 2005)
2005/06/28	Numerical calculation of fractional derivatives using automatic differentiation and double exponential formula (The 34th Numerical Analysis Symposium 2005)