Julius Fergy Tiongson RABAGO
Hello! I'm Fergy. I have been a JSPS Postdoctoral Fellow since November 2024, mentored by Professor Masato Kimura, and was previously a Postdoctoral Researcher and a mentee of Professor Hirofumi Notsu at the Faculty of Mathematics and Physics, Kanazawa University. I also served as an Adjunct Assistant Professor at Temple University, Japan Campus from January to October 2024.
My current research interests include stationary free boundary and free surface problems, moving boundary problems, geometric inverse problems, and applications of shape optimization methods.
News
- 2026.09.14: New Event
- 35th Workshop on Mathematical Analysis for Nonlinear Phenomena
- 2026.08.30: Publication
- Our paper on theoretical and numerical studies of a Sobolev-gradient coupled complex boundary method for diffusion coefficient reconstruction has been published in The Science Reports of Kanazawa University (with S. P. Nainggolan and H. Notsu).
- 2026.08.24-27:
- Mini-symposium on "Recent Advances in Numerical Shape and Topology Optimization Methods: From Theory to Practice" at The 19th SIAM East Asian Section Conference, Jeju Island, 2026 (co-organized with W. Gong and S. Zhu)
- 2026.07.27: Published Online
- Our paper on a shape optimization approach for inverse diffusion problems using a single boundary measurement has been published as an Early Access article in Inverse Problems and Imaging (with M. Machida and H. Notsu).
- 2026.07.24:
- Young Researchers Workshop on Applied Mathematics @ Kanazawa City, Ishikawa, Japan
- 2026.06.20-23:
- Continuum Mechanics Focusing on Singularities–Numerical Analysis & Scientific Computing 2026 @ Lapu-Lapu City, Cebu, Philippines
- 2026.05.13: Preprint
- A new paper is up on arXiv on cavity shape reconstruction with a homogeneous Robin condition via a constrained coupled complex boundary method with ADMM, with M. Essahraoui, E. Cherrat, and L. Afraites.
- 2026.04.21: Publication
- Our paper titled "Enhanced shape recovery in advection–diffusion problems via a novel ADMM-based CCBM optimization" has been published in the Journal of Optimization Theory and Applications, Volume 209, Article Number 44, 2026. (with E. Cherrat and L. Afraites)
- 2026.03.04: Preprint
- A new paper is up on arXiv on statistical topological gradient and shape optimization for robust metal--semiconductor contact reconstruction, with L. Afraites, A. Hadri, and M. Hrizi.
- 2026.02.02: Preprint
- A new paper is up on arXiv on numerical methods for diffusion coefficient recovery, with S. P. Nainggolan and H. Notsu.
Education
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PhD Informatics (2020), Nagoya University, Nagoya, Japan, 2017.10 – 2020.09
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MSc Mathematics (2017), University of the Philippines Baguio, Baguio City, Philippines, 2015.01 – 2017.01
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PMAM Actuarial Science (2015), University of the Philippines Diliman, Quezon City, Philippines, 2011.06 – 2015.01
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BSc Mathematics (2010), University of the Philippines Baguio, Baguio City, Philippines, 2007.06 – 2010.10
Projects
Keywords
- Free boundary problems
- Free surface problems
- Geometric inverse problems
- Moving boundary problems
- Shape optimization methods
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Novel hybrid methods for accurate shape reconstruction: advancing theory and computational solutions ▶
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Development of effective and accurate non-conventional solution methods for shape inverse problems: theory and numerics ▶
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The Analysis of Bernoulli free boundary problem using the velocity method and second-order perturbation of identity technique ▶
Journal Refereeing
- Acta Applicandae Mathematicae
- Applied Mathematics and Optimization
- Communications in Nonlinear Science and Numerical Simulation
- Computers & Mathematics with Applications
- Discrete and Continuous Dynamical Systems - S
- Fractional Calculus and Applied Analysis
- International Electronic Journal of Algebra
- International Journal of Computational Fluid Dynamics
- Inverse Problems
- Journal of Optimization Theory and Applications
- Mathematics and Computers in Simulation
- Modern Stochastics: Theory and Applications
- etc.
Papers
Preprints
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M. Essahraoui, E. Cherrat, L. Afraites, and J. F. T. Rabago
TBA
[PDF] arXiv: doi: -
M. Essahraoui, E. Cherrat, L. Afraites, and J. F. T. Rabago
Cavity shape reconstruction with a homogeneous Robin condition via a constrained coupled complex boundary method with ADMM
[PDF] arXiv:2605.12202 doi: -
L. Afraites, A. Hadri, M. Hrizi, and J. F. T. Rabago
Statistical topological gradient and shape optimization for robust metal--semiconductor contact reconstruction (in revision)
[PDF] arXiv:2603.04216 doi:
Selected Recent Papers ▶
Talks
Upcoming Talks
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TBA
Recent Talks ▶
Teaching
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Part-Time Lecturer, Graduate Course: Applied Analysis ▶
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Adjunct Assistant Professor, Undergraduate Courses: College Algebra ▶
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Lecturer, Undergraduate Course: Pre-Calculus ▶
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Instructor, Undergraduate Courses: Mathematical Biology, Elementary Analysis, and Calculus ▶
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Lecturer, Undergraduate Courses: Elementary Analysis, Calculus, and Pre-Calculus ▶
Research Meetings and Seminars
Events
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The 22nd Workshop on Mathematical Analysis for Nonlinear Phenomena -
International Conference: Differential Equations for Data Science 2025 (DEDS2025), Kyoto, Japan -
Workshop on Modeling and Numerical Analysis of Nonlinear Phenomena 2025 (MNANP2025), Kanazawa, Japan -
The 18th SIAM East Asian Section Conference (EASIAM2025), Manila, Philippines -
Czech Academy of Sciences--Kanazawa University Workshop, Kanazawa, Ishikawa, Japan -
SEAMS School 2025 Baguio (Inverse Problems and Optimal Control), Baguio, Philippines
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AMSC 2026: Workshop on Applied Mathematics and Scientific Computing, Kanazawa, Ishikawa, Japan
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3rd AMSC 2026: Workshop on Applied Mathematics and Scientific Computing, Kanazawa, Ishikawa, Japan
Contacts
Postal Address
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Room 211, Building C4
(Telephone Number: +81-76-264-6129)
Faculty of Mathematics and Physics
研究室２１１自然科学５号館
理工研究域 数物科学系
Institute of Science and Engineering
Kanazawa University, Kakuma Campus
Kanazawa, 920-1192, Ishikawa, Japan
E-Mail Addresses
rabagojft[at]se.kanazawa-u.ac.jp(This email address is no longer in use.)jftrabago[at]gmail.com
jfrabago[at]gmail.com