학회활동  국제학술회의논문발표 ㆍ Error estimates of optimal orders for Galerkin methods to one dimensional  Stefan problems Sixth International Colloquium on Differential Equations Plodiv, Bulgaria (1995) ㆍ Convergence of Galerkin approximations of a Rosenau equation. The second international conference on nonlinear functional analysis  and applications (1996) ㆍ The variational problems and equivalent forms for second order elliptic boundary value problem  International Conference on Mathematical Analysis and Applications (1998) ㆍ Fully discrete Galerkin approximation for a single-phase nonlinear Stefan  problem in one space dimension The fifth international Conference on Nonlinear Analysis and Applications (1999) ㆍ Finite element approximation for a linear Stefan problem with forcing  term International Conference on Applied Nonlinear Analysis (2000) ㆍ Finite element approximation of fourth order boundary value problem The sixth international Conference on Nonlinear Analysis and Applications (2000)  ㆍ Fully discrete approximation for a free boundary problem in polymer technology The 7th international conference on nonlinear functional analysis and applications(2001) ㆍ Error estimates for a single-phase Stefan problem with forcing term The 10th international colloquium on numerical analysis and computer science Plodiv, Bulgaria(2001)  국내학술회의 논문 발표 ㆍ Estimates of optimal orders for Galerkin method to one dimensional Stefan problems 부산경남 수학회 (1994) ㆍ W-공간상에서의 벡터치함수에 대한 최소최대 부등식 부산경남 수학회 (1995) ㆍ 쌍곡형 볼테라 적분 미분 방정식 부산경남 수학회 (1995) ㆍ Free Boundary Value Problem 부산공업대 기초과학연구소 초청강연 ㆍ The Convergence of Galerkin Approximations of the Rosenau Equation 부산경남 수학회 (1996) ㆍ A priori error estimates for a single phase nonlinear Stefan problem in one space dimension '97 Workshop on Mathematical Analysis and Applications(1997) ㆍ Finite element method for the elliptic differential equation 초청강연 (부경대 자연과학대 수리과학부) (1997) ㆍ Finite element method for a single-phase nonlinear Stefan problem in 2-dimensional space 초청강연( 경성대학교 이과대학) (1997) ㆍ The variational problems of a second order elliptic boundary value problem 초청강연 (경성대학교 교육대학원) (1998) ㆍ The existence of finite element approximation of incompressible Navier-Stokes equation 초청강연(경성대) (1998) ㆍ The convergence of finite element approximation of incompressible Navier-Stokes equation 초청강연(경성대) (1998) ㆍ The existence of approximated numerical solution of nonlinear integral equation 초청강연(부경대) (1998) ㆍ The convergence of approximated numerical solution of nonlinear integral equation 초청강연(부경대) (1998) ㆍ Fully discrete Galerkin approximation for a nonlinear Stefan problem '99 Workshop on applied analysis (1999) ㆍ The convergence of finite defference approximations for singular two-point boundary value problems '99 Workshop on applied analysis (1999) ㆍ The existence of finite element approximation of incompressible  Navier Stokes equation  초청강연(경성대) (1999)  ㆍ The convergence of finite element approximation of incompressible  Navier Stokes equation 초청강연(경성대) (1999)  ㆍ The existence of approximated numerical solution of nonlinear  integral equation 초청강연(부경대) (1999)  ㆍ The convergence of approximated numerical solution of nonlinear  integral equation 초청강연(부경대) (1999)  ㆍ Finite element fully discrete solution of the Stefan problem with forcing term The Fifth Korea Nonlinear Analysis Conference (1999) ㆍ Fully discrete approximations for a quasi-linear Stefan problem  with forcing term The fifth applied Mathematics forum (2000) ㆍ Galerkin Crank-Nicolson approximation for a quasi-linear free boundary problem with forcing term 한국전산응용수학회 (2000) ㆍ Mixed and Hybrid finite element method 초청강연(부경대) (2000) ㆍ Finite element method of free boundary value problem 초청강연(부경대) (2000) ㆍ Finite element approximation of the incompressible Navier Stokes equations 초청강연(부산대) (2000) ㆍ The applications of wavelets in finite element method 초청강연(부산대) (2000) ㆍ The finite element method of the Stefan problem 초청강연(부산대) (2000) ㆍ The error estimates of finite element approximation of the free boundary problem 초청강연(경성대) (2000) ㆍ The error estimates of discontinuous Galerkin method of parabolic problem 초청강연(경성대)(2001) ㆍ The discontinuous finite element method of the Stefan problem 초청강연(부산대)(2001) ㆍ A priori error estimates of discontinuous Galerkin method of parabolic problem 초청강연(경성대)(2001) ㆍ The mixed finite element method of the quasilinear Stefan problem 초청강연(부산대)(2001) ㆍ A priori error estimates for a single-phase quasi-linear Stefan problem with forcing term 응용수학포럼 (2001) 20001.8.20-21 용인 한화리조트 ㆍ The discontinuous finite element method of the elliptic partial differential equations 초청강연(부산대)(2001) ㆍ A priori error estimates of discontinuous Galerkin method of elliptic problem  초청강연(경성대)(2001)