Tathagata Goswami Hillsboro, OR

Email : adjgjz@r.postjobfree.com Phone : +1-669-***-****

Objective

Looking for full time opportunities in the area of Software Development, Numerical Analysis, Applied Maths and Physics. I am a nal year Ph.D. student at Portland State University, pursuing in Computational Applied Mathematics. I have close to three years of experience in programming and software development. I have implemented, tested, and benchmarked numerical model of Maxwell’s electromagnetic theory in optical bers. As an outcome of my work, I along with my Ph.D. advisor have reduced the computation cost of the model by almost a factor of 30 (through Physics-based model order reduction and parallelization). I mainly use C++ for backend computations and python for interfacing the C++ classes(py-binding) and data post-processing.

Education

Ph.D. in Computational Applied Mathematics: GPA: 4.00/4.00 Sept. 2015 { Present Portland State University; Expected Graduation: June, 2021 Portland, OR Software Skills

Programming Languages: C++14, Python3.

Tools: GIT, Bash, LA

TEX, Markdown.

Softwares: Matlab, NGSolve (Multiphysics Finite element Software), COMSOL (Radio Frequency Module),

Development Platform: Linux (Pref), Unix, Windows.

Other: Parallel Programming, High Performance Computing (HPC). Experience

Doctoral:

Portland State University

4 years of experience in developing in Python3: O.O.P., Data structure, Parallel programming (mpi4py), Memory management, File management, PEP8.

3 years of experience in developing in C/C++14: C/C++ data structures, O.O.P., STL, algorithm, vector, Parallel programming (MPI, OpenMP), Memory management, pybind11, Funtion types.

Working experience of building software from source and running simulations (serial and parallel) in remote servers: Knowledge of di erent SLURM and PBS routines/standards.

Working knowledge of using meshing or linear algebra based softwares: Netgen, and NGSolve.

Theoretical and practical knowledge of various numerical methods such as: Finite Element Method, Finite Volume Method, Discontinuous Petrov-Galerkin Method etc.

Background in: Advanced Linear Algebra, Fourier Analysis, Fiber-Optics, Modern theory of Partial Di erential Equations, Measure theory, Functional Analysis.

(Project) High frequency single or multiple light propagation in optical ber ampli ers: Model developer (development, test, debug, automation, user-driver-interface), wrote tests for benchmarking, the code is both shared and distributed memory parallel. Cut down the the computational cost by almost a factor of 30.

(subProject) Intermodal power transfer in an optical ber using arti cial grating: Proved aposteriori that for general energy transfer only a time independent asymmetric perturbation is needed to the refractive index pro le of the ber.

(subProject) Find threshold for launched pump power value in high power laser operations: Found the threshold numerically and showed that the dominating e ect behind the threshold is the produced heat and hence the ber temperature, developed routines/classes to automate this operation.

(hobbbyProject) Developed various automation/helper/test/plot/animation routines in python3: matplotlib, celluloid, pandas, mpmath, pytest, sympy.

Graduate Teaching Assistant: Taught Intermediate Algebra, Calculus I II III, Basic Linear Algebra.

Internship: Summer 2018

Clemson University Clemson, SC

Programming numerical models of di erent optical bers in COMSOL: Benchmarking models using existing/published data and produce data for ber lab fabrication.

Data post-processing/visualization: Python3, Microsoft Excel.

Internship: June 2014 - November 2014

INRIA (National Institute for Research in Computer Science and Control) Nice, France

Matlab scripting: Developed model in matlab, made GUI for general users, model veri cation. Publications

T. Goswami (First Author.), J. Grosek, J. Gopalakrishnan, Simulations of single- and two-tone Tm-doped optical ber laser ampli ers, currently under journal review.

D. Drake, J. Gopalakrishnan, T. Goswami, J. Grosek., Simulation of optical ber ampli er gain using equivalent short bers, Computer Methods in Applied Mechanics and Engineering (2019) 112698, https://doi.org/10.1016/j.cma.2019.112698.

J. Gopalakrishnan, T. Goswami, and J. Grosek, Techniques for modeling ber laser ampli ers, Springer Proceedings, Scienti c Computing in Electrical Engineering, 2019. Presentations and Conferences

"Modeling and simulation of Optical Fiber gain using equivalent short bers"; Cascade RAIN: 2019, University of Washington, Bothell, Washington.

"Modeling and simulation of Optical Fiber gain using equivalent short bers"; Computational and Applied Seminar: 2019, Portland State University, Oregon.

"Propagation of light in step-index optical bers in presence of an arti cial grating and its connection to Transverse Mode Instability (TMI)"; Computational and Applied Seminar: 2020, Portland State University, Oregon.