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Hello! I'm Julius Fergy Tiongson Rabago. I have been a JSPS Postdoctoral Fellow since November 2024, mentored by Professor Masato Kimura. Previously, I was a Postdoctoral Researcher under Professor Hirofumi Notsu at the Faculty of Mathematics and Physics, Institute of Science and Engineering, 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.

Upcoming Events

2025.06.30-07.04: The 18th SIAM East Asian Section Conference, Manila, 2025
2025.12.03-11: SEAMS School 2025 Baguio (Inverse Problems and Optimal Control)

News

2025.06.22: Preprint

A new paper is up on arXiv about the simultaneous recovery of a corroded boundary and admittance using the Kohn-Vogelius method, with M. Essahraoui, E. Cherrat and L. Afraites.

2025.06.18: Publication

My paper titled "Localization of tumor through a non-conventional numerical shape optimization technique" has been published in Applied Numerical Mathematics, Volume 217, November 2025, Pages 135-171. [PDF, Free Access Until 2025.08.07]

2025.06.08: Accepted Paper

Our paper titled "On the well-posedness of a Hele-Shaw-like system resulting from an inverse geometry problem formulated through a shape optimization setting" has been accepted to ESAIM: Control, Optimisation and Calculus of Variations (with M. Kimura)

2025.05.01: Publication

Our paper titled "Convergences of the bi-periodic Horadam Sequences and the bi-periodic Lucas--Horadam Matrix" has been published in Communications of the Korean Mathematical Society, Volume 40, Issue 2, 2025, Pages 243-270 (with J. P. Ascaño and E. N. Gueco)

2025.04.14: Preprint

A new paper is up on arXiv about a numerical shape optimization for an inverse problem in multi-dimensional advection-diffusion equations with spatially varying coefficients, with E. Cherrat and L. Afraites.

2025.03.20: Publication

Our paper titled "Detecting an Immersed Obstacle in Stokes Fluid Flow Using the Coupled Complex Boundary Method" has been published in SIAM Journal on Control and Optimization, Volume 63, Issue 2, 2025, Pages 822-851 (with L. Afraites and H. Notsu)

2025.03.20: Preprint

A new paper is up on arXiv about a shape optimization approach for inverse diffusion problems using a single boundary measurement, with M. Machida and H. Notsu.

2024.09.11: Publication

Our paper titled "A robust alternating direction method of multipliers numerical scheme for solving geometric inverse problems in a shape optimization setting" has been published in Computers & Mathematics with Applications, Volume 175, September 2024, Pages 19-32 (with A. Hadri, L. Afraites, A. S. Hendy, and M. A. Zaky)