• Advances in High-Order Methods - fluid dynamics, biomedical science, and exascale computing, Pohang South Korea, June 10-13, 2024
• Title: Level Set Methods on Polyhedral Meshes

• Discrete Duality Finite Volume Method and Applications, Jean-Morlet Chair - Workshop, CIRM, Marseille, France, October 17-21, 2022
• Title:Finite Volume Method for Level Set Equations on Polyhedral Meshes

• A series of seminars, KAIST, Daejeon, South Korea, July 19-21, 2023
• Title: Image Processing before the Era of Neural Network

• Workshop on Scientific Computing 2022, Děčín, Czech Republic, May 26-29, 2022
• Title: What is a proper boundary condition to solve eikonal equation on a non-convex domain?

• ALGORITMY 2020, Conference on Scientific Computing, Vysoke Tatry, Podbanske, Slovakia, September 10-15, 2020
• Title: Finite volume level set methods in combustion engines

• Summer School for modeling in medical mathematics, National Institute for Mathematical Sciences, Deajeon, South Korea, July 2-4, 2019
• Title: Modeling for Medical Mathematics: Evolution of Manifolds, Finite Volume Method, and Deep Learning

• SIAM Conference on Imaging Science, May 28-31, 2024, Atlanta, USA, Title: Surface reconstruction: PDEs, Variational, and Deep Learning Methods - Part I and II

• ALGORITMY 2024, March 15-20, 2024, High Tatra Mountains, Slovakia, Title: Numerical methods for level-set and eikonal equations - theory and applications

• International Congress on Industrial and Applied Mathematics, August 20-25, 2023, Tokyo, Japan, Title: Numerical Algorithms for the Eikonal Equation and Its Applications

• International Congress on Industrial and Applied Mathematics, July 15-19, 2019, Valencia, Spain, Title: Advanced numerical methods for evolving manifolds

• Europe-Korea Conference on Science and Technology, August 20-24, 2018, Glasgow, UK. Title: Moving interface problems in computational fluid dynamics

• 6^th European Conference on Computational Mechanics, 7^th European Conference on Computational Fluid Dynamics, June 11-15, 2018, Glasgow, UK. Title: Information technology and machine learning

• Europe-Korea Conference on Science and Technology, July 26-29, 2017, Stockholm, Sweden. Title: Industrial mathematics for scientific computing: Imaging and machine learning and computational fluid dynamics

• Europe-Korea Conference on Science and Technology, July 27-30, 2016, Berlin, Germany. Title: Contemporary topics in image processing and computer vision

• SIAM Imaging Science, May 23-26, 2016, New Mexico, USA. Title: PDE-based image processing: Reconstruction, filtering, segmentation, compression, and inpainting

• International Conference on Numerical Combustion, April 19-22, 2015, Avignon, France. Title: Surface evolution methods in gasoline direct injection combustion engines

• SIAM Imaging Science, May 20-22, 2012, Philadelphia, USA. Title: Functional analysis and accurate numerical methods in image processing

• International Congress on Industrial and Applied Mathematics, July 18-22, 2011, Vancouver, Canada. Title: Fast optimization algorithms in image processing and its applications

• SIAM Imaging Science, April 12-14, 2010, Chicago, USA. Title: Surface reconstruction from sparse gradient fields, unorganized point clouds, and photometric stereo

• Jooyoung Hahn, Karol Mikula, Peter Frolkovič, Eikonal boundary condition for level set method, ALGORITMY 2024 Conference on Scientific Computing, Vysoke Tatry, Podbanske, Slovakia, March 15-20, 2024.

• Yesom Park, Taekyung Lee, Jooyoung Hahn, Myungjoo Kang, p-Poisson surface reconstruction in curl-free flow from point clouds, NeurIPS 2023, Advances in Neural Information Processing Systems 36, New Orleans, USA, December 10-16, 2023, [Paper Link], Open Review.

• Jooyoung Hahn, Karol Mikula, Peter Frolkovič, Regularized eikonal equation on polyhedral meshes, International Congress on Industrial and Applied Mathematics, Tokyo, Japan, August 20-25, 2023.

• Jooyoung Hahn, Finite Volume Method for Level Set Equations on Polyhedral Meshes, Discrete Duality Finite Volume Method and Applications, Jean-Morlet Chair - Workshop, CIRM, Marseille, France, October 17-21, 2022.

• Jooyoung Hahn, Karol Mikula, Peter Frolkovič, Finite volume method for regularized eikonal equation with Soner boundary condition on polyhedral meshes, The 8th international conference on Advanced COmputational Methods in ENgineering, Li\`{e}ge, Belgium, August 31-September 2, 2022.

• Jooyoung Hahn, Karol Mikula, Peter Frolkovič, Branislav Basara, Time-dependent eikonal equation with Soner boundary condition, XVIII International Conference on Hyperbolic Problems Theory, Numerics, Applications, M\'{a}laga, Spain, June 20-24, 2022.

• Jooyoung Hahn, Karol Mikula, Peter Frolkovič, Martin Balažovjech and Branislav Basara, Cell-Centered Finite Volume Method for Regularized Mean Curvature Flow on Polyhedral Meshes, In International Conference on Finite Volumes for Complex Applications IX, Bergen, Norway, 755-763, 2020. [Paper Link].

• Jooyoung Hahn, Matej Medl'a, Karol Mikula, Peter Frolkovič, Branislav Basara, Industrial Mathematics for G-equation in Premixed Turbulent Combustion, In 13^th International Congress on Industrial and Applied Mathematics, Valencia, Spain, July 15-19, 2019.

• In 14^th IEEE International Conference on Automatic Face and Gesture Recognition, Lille, France, May 14-18, 2019.

• Jooyoung Hahn, Matej Medl'a, Karol Mikula, Peter Frolkovič, Branislav Basara, Industrial Mathematics for G-equation in Premixed Turbulent Combustion, In 13^th International Congress on Industrial and Applied Mathematics, Valencia, Spain, July 15-19, 2019.

• Jooyoung Hahn, Matej Medl'a, Karol Mikula, Peter Frolkovič, Branislav Basara, Industrial Methods for G-equation Combustion Model in a 3D Polyhedron Mesh, In 13^th World Congress on Computational Mechanics, New York, NY, USA, July 23-27, 2018.

• Jooyoung Hahn, Matej Medl'a, Karol Mikula, Peter Frolkovič, Branislav Basara, Semi-implicit level set method for advective and normal flow on polyhedron meshes, In 6^th European Conference on Computational Mechanics, 7^th European Conference on Computational Fluid Dynamics, Glasgow, UK, June 11-15, 2018.

• Jooyoung Hahn, Karol Mikula, Peter Frolkovič, Branislav Basara, Semi-implicit method with inflow-based gradient for the G-equation model on a polyhedron mesh, In 7^th International Conference on Advanced Computational Methods in Engineering, ACOMEN 2017, Gent, Belgium, September 18-22, 2017.

• Jooyoung Hahn, Karol Mikula, Peter Frolkovič, Semi-implicit method with inflow-based gradient for the level set equations on a polyhedron mesh, In Equadiff2017, Bratislava, Slovakia, July 24-28, 2017.

• Jooyoung Hahn, Karol Mikula, Peter Frolkovič, Branislav Basara, Semi-implicit level set method with inflow-based gradient in a polyhedron mesh, In International Conference on Finite Volumes for Complex Applications VIII, Lille, France, 81-89, 2017, [Paper Link].

• Jooyoung Hahn, Karol Mikula, Peter Frolkovič, Inflow-based finite volume method for level set equations in a polyhedron mesh, In 88^th Annual Meeting of the International Association of Applied Mathematics and Mechanics, Weimar, Germany, March 6-10, 2017.

• Jooyoung Hahn, Inflow-based gradient finite volume method for level set method in the premixed combustion, In The 36^th International Symposium on Combustion, Seoul, Korea, July 31-August 5, 2016.

• Jooyoung Hahn, Karol Mikula, Peter Frolkovič, and Branislav Basara, Inflow-based gradient finite volume method for level set Equation, In SIAM Conference on Imaging Science (IS16), Albuquerque, New Mexico, USA, May 23-26, 2016.

• Jooyoung Hahn, Karol Mikula, Peter Frolkovič, An extension of Rouy-Tourin scheme into a polyhedron mesh, In ALGORITMY 2016 Conference on Scientific Computing, Vysoke Tatry, Podbanske, Slovakia, March 13-18, 2016.

• Jooyoung Hahn, Regularized flux-based gradient for level set methods, In 15^th International Conference on Numerical Combustion, Avignon, France, April 19-22, 2015.

• Jooyoung Hahn, Xue-cheng Tai, and Jason Ginmo Chung, Numerical algorithms for Euler's Elastica models in image processing, In SIAM Conference on Imaging Science (IS12), Philadelphia, Pennsylvania, USA, May 20-22, 2012.

• Jooyoung Hahn, Carlos N. Rautenberg, and Michael Hintermüller, Accurate numerical schemes in image denoising, In SIAM Conference on Imaging Science (IS12), Philadelphia, Pennsylvania, USA, May 20-22, 2012.

• Jooyoung Hahn, Xue-Cheng Tai, and Ginmo Chung, A Fast Algorithm for Euler's Elastica Model Using Augmented Lagrangian Method, In ICIAM, Vancouver, BC, Canada, July 18-22, 2011.

• Jooyoung Hahn, Ginmo Chung, Yu Wang, and Xue-Cheng Tai, Fast algorithms for p-elastica energy with the application to image inpainting and curve reconstruction, In: Bruckstein, A.M., ter Haar Romeny, B.M., Bronstein, A.M., Bronstein, M.M. (eds) Scale Space and Variational Methods in Computer Vision. SSVM 2011. Lecture Notes in Computer Science, vol 6667. Springer, Berlin, Heidelberg, pp. 162-182, In 3^rd International Conference on Scale Space and Variational Methods in Computer Vision, Ein-Gedi, Israel, May 29-Jun 2, 2011, [Paper Link].

• Yuping Duan, Yu Wang, Xue-Cheng Tai, and Jooyoung Hahn, A fast augmented Lagrangian method for Euler's elastica model, In: Bruckstein, A.M., ter Haar Romeny, B.M., Bronstein, A.M., Bronstein, M.M. (eds) Scale Space and Variational Methods in Computer Vision. SSVM 2011. Lecture Notes in Computer Science, vol 6667. Springer, Berlin, Heidelberg, pp. 144-156, In 3^rd International Conference on Scale Space and Variational Methods in Computer Vision, Ein-Gedi, Israel, May 29-Jun 2, 2011, [Paper Link].

• Jooyoung Hahn and Xue-Cheng Tai, Surface reconstruction and shading from sparse gradient fields based on vector inpainting, In SIAM Conference on Imaging Science (IS10), Chicago, Illinois, USA, Apr 12-14, 2010.

• Jooyoung Hahn, Sofia Borok, Xue-Cheng Tai, and Alfred M. Bruckstein, On Orientation-Matching Minimization TV-Stokes Equation: Image Denoising and Image Inpainting, In IMI Workshop on Computational Aesthetics and Photography, Singapore, Dec 12-13, 2010.

• Xue-Cheng Tai, Sofia Borok, and Jooyoung Hahn, Image Denoising Using TV-Stokes Equation with an Orientation-matching Minimization, In: Tai, XC., Mørken, K., Lysaker, M., Lie, KA. (eds) Scale Space and Variational Methods in Computer Vision. SSVM 2009. Lecture Notes in Computer Science, vol 5567. Springer, Berlin, Heidelberg, In 2^th International Conference on Scale Space and Variational Methods in Computer Vision, Voss, Norway, June 1-5, 2009, [Paper Link].

• Jooyoung Hahn and Chang-Ock Lee, A nonlinear structure tensor with diffusivity matrix composed of image gradient, In SIAM Conference on Imaging Science, San Diego, California, USA, July 7-9, 2008.

• Min Jeong Kwon, Jooyoung Hahn, and HyunWook Park, A robust spherical inflation technique using the method of concentric rings, In Joint Annual Meeting ISMRM-ESMRMB, Berlin, Germany, May 2007.

• Jooyoung Hahn and Chang-Ock Lee, Highly accurate segmentation using geometric attraction-driven flow in edge-regions, In SIAM Conference on Imaging Science, Radisson University Hotel, Minneapolis, Minnesota, USA, May 15-17, 2006.

• Chang-Ock Lee, Kiwan Jeon, Youngsoo Ha, and Jooyoung Hahn, A variational approach to blending based on warping for non-overlapped images, In The 3^rd Chinese-Korean Joint Workshop on Recent Advances in Numerical Analysis and Its Applications, Cheju National University Park, Seogwipo, Cheju, Korea, February 21-25, 2005.

• Jooyoung Hahn and Chang-Ock Lee, Geometric attraction-driven flow for image segmentation and boundary detection, In KSIAM 2007 Annual Meeting, Hyundai Sungwoo Resort, Hoengseong, Korea, November 23-24, 2007.

• Jooyoung Hahn and Chang-Ock Lee, Fine segmentation using geometric attraction-driven flow and edge-regions, In KSIAM 2007 Spring Conference, KAIST, Deajeon, Korea, May 25-26, 2007. (KSIAM Young Researcher Award)

• Chang-Ock Lee and Jooyoung Hahn, Nonlinear structure tensor using diffusion coefficients based on image, In KSIAM 2007 Spring Conference, KAIST, Deajeon, Korea, May 25-26, 2007.

• Jooyoung Hahn, Kiwan Jeon, Chang-Ock Lee, and Kilsu Park, Segmentation and background extraction with application to e-catalogue, In KSIAM 2005 Conference in Spring, Seoul National University, Seoul, Korea, May 20-21, 2005.