Seyyed Ahmad Hosseini

Assistant Professor, Applied Mathematics
Department of Mathematics, Faculty of Sciences

Ph.D (2013)

Applied Mathematics - Numerical Analysis

University of Tabriz - Iran

M.Sc (2007)

Applied Mathematics - Numerical Analhysis

Tabriz - Iran

B.Sc (2005)

Applied Mathematics

University of Tabriz - Iran

  • A. Abdi, K. Hormann, S.A. Hosseini , Linear barycentric rational Hermite quadrature and its application to Volterra integral equations , Journal of Computational and Applied Mathematics , (2026) , 474 , 117009
    Quadrature rules are a common numerical tool for approximating definite integrals. While most classical rules are based on polynomial interpolation, recent results reveal the efficiency and effectiveness of quadrature rules based on linear barycentric rational interpolants. In this paper, we derive new quadrature rules from barycentric rational Hermite interpolants and prove their convergence orders. We then use the proposed quadrature rules to construct direct quadrature methods for solving Volterra integral equations. We provide several numerical experiments that validate our theoretical results and illustrate the efficiency of our new quadrature rules and methods.
  • A. Abdi, S.A. Hosseini and H. Podhaisky, The linear barycentric rational backward differentiation formulae for stiff ODEs on nonuniform grids , Numerical Algorithms , (2024) , 98 , 877–902
    Backward differential formulae (BDF) are the basis of the highly efficient schemes for the numerical solution of stiff ordinary differen- tial equations for decades. An alternative multistep schemes (RBDF) based on barycentric rational interpolation is proposed. Specifically, robust new methods of orders 1 to 5 are derived. The local trun- cation error is analyzed for variable stepsizes in order to implement a variable order, variable stepsize prototype in Matlab. Aspects of the implementation are addressed in detail. Numerical experiments illustrate that the RBDF code compares well with Matlab’s ode15s.
  • A. Abdi, J.-P. Berrut and S. A. Hosseini , Explicit methods based on barycentric rational interpolants for solving non-stiff Volterra integral equations , Applied Numerical Mathematics , (2022) , 174 , 127-141
    For their high accuracy and good stability properties, implicit numerical methods are widely used for solving Volterra integral equations, while, in order to save computational effort, explicit algorithms are preferred in the case of non-stiff problems. In this paper, highly accurate explicit methods based on the Floater–Hormann family of linear barycentric rational interpolants are presented. The order of convergence is obtained in terms of the parameters of the methods. Moreover, the linear stability properties with respect to both the basic and convolution test equations are analyzed in detail. Numerical experiments are discussed in order to validate the theoretical results and illustrate the efficiency and power of the methods applied to non-stiff and mildly stiff problems.
  • A. Abdi, S.A. Hosseini and H. Podhaisky, Numerical methods based on the Floater–Hormann interpolants for stiff VIEs , Numerical Algorithms , (2020) , 85 , 867–886
    The Floater–Hormann family of the barycentric rational interpolants has recently gained popularity because of its excellent stability properties and highly order of convergence. The purpose of this paper is to design highly accurate and stable schemes based on this family of interpolants for the numerical solution of stiff Volterra integral equations of the second kind.
  • A. Abdi, S.A. Hosseini and H. Podhaisky, Adaptive linear barycentric rational finite differences method for stiff ODEs , Journal of Computational and Applied Mathematics , (2019) , 357 , 204-214
    It is our purpose to introduce a simple multistep method based on linear barycentric rational interpolation for solving ordinary differential equations. Also, we design an adaptive version having one free parameter which is used to improve the stability properties. Numerical experiments of the constructed methods on some well-known stiff problems indicate efficiency and capability of the methods in solving stiff problems.
  • A. Abdi and S. A. Hosseini, The barycentric rational difference-quadrature scheme for system of‎ ‎Volterra integro-differential equations , SIAM Journal on Scientific Computing , (2018) , 40 , A1936-A1960
    In this paper, two applications of linear barycentric rational interpolation are used to derive a difference-quadrature scheme for solving a class of systems of Volterra integro-differential equations of the second kind. The convergence of the proposed method is proved, and the order of convergence is obtained in terms of the parameters of the method. Furthermore, the linear stability of the proposed method with respect to both the basic and convolution test equations is analyzed. All the obtained theoretical results are verified by several numerical experiments.
  • A. Abdi, J.-P. Berrut and S. A. Hosseini , The linear barycentric rational method for a class of delay Volterra integro-differential equations , Journal of Scientific Computing , (2017) , 75 , 1557-1575
    A method for solving delay Volterra integro-differential equations is introduced. It is based on two applications of linear barycentric rational interpolation, barycentric rational quadrature and barycentric rational finite differences. Its zero–stability and convergence are studied. Numerical tests demonstrate the excellent agreement of our implementation with the predicted convergence orders.
  • S. A. Hosseini and A. Abdi, On the numerical stability of the linear barycentric rational quadrature method for Volterra integral equations , Applied Numerical Mathematics , (2016) , 100 , 1-13
    This paper deals with the stability analysis of the composite barycentric rational quadrature method (CBRQM) for the second kind Volterra integral equations through application to the standard and the convolution test equations. In each case, some theoretical results are achieved by providing corresponding recurrence relation and stability matrix. Verification of these theoretical results is obtained by some numerical experiments.
  • S. A. Hosseini, S. Shahmorad, F. Talati, A matrix based method for two dimensional nonlinear Volterra-Fredholm integral equations , Numerical Algorithms , (2015) , 68 , 511-529
  • J.-P. Berrut, S. A. Hosseini and G. Klein, The linear barycentric rational quadrature method for Volterra integral equations , SIAM Journal on Scientific Computing , (2014) , 36 , A105--A123
    We introduce two direct quadrature methods based on linear rational interpolation for solving general Volterra integral equations of the second kind. The first, deduced by a direct application of linear barycentric rational quadrature given in former work, is shown to converge at the same rate as the rational quadrature rule but is costly on long integration intervals. The second, based on a composite version of this quadrature rule, loses one order of convergence but is much cheaper. Both require only a sample of the involved functions at equispaced nodes and yield an infinitely smooth solution of most classical examples with machine precision.
  • S.A.Hosseini‎, ‎S.Shahmorad and A. Tari, ‎Existence of an Lp-solution for two dimensional integral equations of the Hammerstein type , Bulletin of the Iranian Mathematical Society , (2014) , 40 , 851-862
  • S.A.Hosseini, ‎S.Shahmorad and ‎H.Masoumi, ‎Extension of the operational Tau method for solving 1-D nonlinear transient heat conduction equations , Journal of King Saud University-Science , (2013) , 25 , 283-288
  • A. Abdi‎, ‎‎S.A. ‎Hosseini, ‎G. Hojjati, ‎A class of multivalue-multistage schemes for the numerical solution of Volterra integral equations , International conference on the Numerical Solution of ‎Differential‎‎ and Differential-Algebraic ‎Equations‎ (NUMDIFF-15)‎, , (2018/9) , ,
  • S.A. ‎Hosseini, ‎A. Abdi‎, ‎‎H. Podhaisky, ‎Rational finite differences method based on the barycentric interpolants for ODEs , International conference on the Numerical Solution of ‎Differential‎‎ and Differential-Algebraic ‎Equations‎ (NUMDIFF-15) , (2018/9) , ,
  • A. Abdi, J.-P. Berrut, S. A. Hosseini, The linear barycentric rational method for a class of delay Volterra integro-differential equations , SciCADE (Scientific Computation And Differential Equations) 2017, University of Bath, Bath, UK , (2017/9) , ,
  • S. A. Hosseini, A. Abdi, On the numerical solution of nonlinear systems of delay Volterra integro-differential equations with constant delay , CMFT 2017, Maria Curie-Skłodowska University, Lublin, Poland , (2017/7) , ,
  • A. Abdi, G. Hojjati, S. A. Hosseini, Multistage-multivalue methods with inherent stability property for ordinary differential equations , CMFT 2017, Maria Curie-Skłodowska University, Lublin, Poland , (2017/7) , ,
  • G. Hojjati, A. Abdi, S. A. Hosseini, Geometric second derivative numerical methods for solving Hamitonian problems , CMFT (Computational Methods and Function Theory) 2017, Maria Curie-Skłodowska University, Lublin, Poland , (2017/7) , ,
  • S. A. Hosseini, A. Abdi, Theoretical results on the stability of the linear barycentric rational quadrature methods , SciCADE (Scientific Computation And Differential Equations) 2015, University of Potsdam, Potsdam, Germany , (2015/9) , ,
  • S. A. Hosseini, A. Abdi, The stability behavior of the composite barycentric rational quadrature method for the numerical solution of VIEs , The 12th Seminar on Differential Equations and Dynamical Systems, University of Tabriz, Tabriz, Iran , (2015/5) , , 267-271
  • S. A. Hosseini, The composite barycentric rational quadrature method for Volterra integral equations , The 44th Annual Iranian Mathematics Conference, Ferdowsi University of Mashhad, Mashhad, Iran , (2013/8) , , 1054-1057
  • S. A. Hosseini, S. Shahmorad, Tau matrix method for 2D nonlinear Volterra- Fredholm integral equations , The 44th Annual Iranian Mathematics Conference, Ferdowsi University of Mashhad, Mashhad, Iran , (2013/8) , , 1058-1061
  • S. A. Hosseini, S. Shahmorad, A computational method for solving two dimensional nonlinear Fredholm integral equations , The 43rd Annual Iranian Mathematics Conference, University of Tabriz, Tabriz, Iran , (2012/8) , , 611-614
  • A. Abdi, S.A. Hosseini، Foundations of Numerical Analysis with MATLAB (In Persian) ، ، (1394/7/8) ، ، 1-366
  • A research fellowship for scientific exchanges program ، Swiss National Science Foundation (SNSF) ، (2023) ، Switzerland
  • Scholarship for research stays for university academics and scientists ، German Academic Exchange Service (DAAD) ، (2021) ، Germany
  • A financial support for scientific research to promote international exchanges ، Research Fund of the University of Fribourg ، (2020) ، Switzerland
  • A financial support for scientific research to promote international exchanges ، Research Fund of the University of Fribourg ، (2019) ، Switzerland
    • Le Fonds de recherche du centenaire de l'Université de Fribourg s'adresse aux chercheuses et chercheurs de l'Unifr et vise à soutenir des activités de recherche contribuant au rayonnement intellectuel de l'institution.
  • Scholarship for research stays for university academics and scientists ، German Academic Exchange Service (DAAD) ، (2018) ، Germany
    • The aim of this particular programme is to support short-term research stays and thus promote the exchange of experience and networking amongst colleagues.
  • Scholarship for research stay at Post-Doctorate level ، International Relations Office of the University of Fribourg ، (2016) ، Switzerland
  • Scholarship for research stay at PhD level ، International Relations Office of the University of Fribourg ، (2012) ، Switzerland
    Iranian Mathematical Soceity ، (2012 - cont'd) ، Iran
  • Parallel and Fast Computing، ، (2013) ، University of Tabriz ، Iran
  • Relationship between Mathematics and Industry، ، (2012) ، University of Tabriz ، Iran
  • Fatemeh Farmoudeh Yamche، BDF-type methods based on barycentric rational interpolants for initial value problems ، Golestan University ، (1402/4/25)
  • Seyyed Reza HosseiniTabar، The multivariate polynomial interpolation ، Golestan University ، (1401/6/28)
  • Fatemeh Kordi، Topics in the spectral and barycentric rational pseudospectral methods for integral equations ، Golestan University ، (1401/4/25)
  • Mahin Hasanghasemi، The linear barycentric rational collocation method for Volterra integro-differential equations ، Golestan University ، (1401/4/25)
  • Tahereh Pouraman، The linear barycentric rational quadrature method for auto-convolution Volterra integral equations ، Golestan University ، (1399/11/29)
  • Fatemeh Maghsoudlou، An extension of the linear barycentric rational interpolants and its applications ، Golestan University ، (1397/4/13)
  • Advanced Numerical Analysis ، M.Sc ، (2017) ، Department of Mathematics, Faculty of Sciences
  • Functional Analysis ، M.Sc. ، (2017) ، Department of Mathematics, Faculty of Sciences
  • Foundations of Numerical Analysis, Numerical Linear Algebra, Mathematical Software, Partial Differential Equations ، B.Sc. ، (2013) ، Department of Mathematics, Computer Sciences & Statistics, Faculty of Sciences
  • Numerical Methods for ODEs ، B.Sc. ، (2015) ، Department of Mathematics, Faculty of Sciences
  • Director of International Relations and Academic Cooperation Office ، (Dec. 2019 - Feb. 2023) ، Golestan University
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