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Achievement: Pair ExtraordinaireAchievement: Pull Sharkx3Achievement: QuickdrawAchievement: YOLO

Achievements

Achievement: Pair ExtraordinaireAchievement: Pull Sharkx3Achievement: QuickdrawAchievement: YOLO

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NaNIsaac/README.md

Isaac Yong (용이삭)

X-ray physics · Scientific computing
M.S. student in Physics, Sogang University

Website  ·  Docs  ·  Notes  ·  Stats  ·  Blog  ·  Email

The name NaNIsaac recovered from its diffraction intensity by phase retrieval

Only the intensity |F|² goes in. QoraPhase recovers the lost phase and the object; script.

I study X-ray scattering and diffraction, and build the software around the experiment: simulation, inverse problems, coherent imaging, and beamtime data analysis. Longer write-ups live on my website.

Research

Research code, results and poster sources live in the NaNIsaac Research organization.

  • TraTT: how acoustic Bragg satellites form while a GHz sound wave enters a perfect crystal, from time-dependent Takagi-Taupin dynamical diffraction. Poster P2.17, KPS 2026 Fall Meeting, Jeju, October 22, 2026 (poster, docs).
  • XRR inverse problem: how much of a thin film one X-ray reflectivity curve determines, and whether a generative posterior model is needed. Work in progress (Experiment 001).

Selected work

Science Tools
QoraPhase (docs) · JAX phase retrieval for CDI and BCDI codigest (docs) · codebase, diffs and terminal output as LLM context
QoraPhaseCU · phase retrieval in C++/CUDA, with a measured optimization log deai · strip AI co-author trailers from git history
QoraHolo · holotomography (ODT) reconstruction in C++/CUDA hanfix · re-run commands typed in the Korean layout
ReflectoLearn (docs) · differentiable X-ray reflectivity fitting clippath · clipboard screenshot to a file path for terminal agents
QoraFlow · time-resolved X-ray data at PAL-XFEL roi_rectangle · rectangular ROIs for NumPy images
TraTT · time-dependent Takagi-Taupin diffraction
xray.ooguy · offline calculators for old beamline PCs

Upstream

Pepper (후추), my black-and-tan Shiba Inu, takes care of the contribution garden.

Pepper harvesting GitHub contributions

Formerly "SJB7777". Renamed to "NaNIsaac" on October 14, 2026, at 00:06:41 KST.

Pinned Loading

  1. QoraFlow QoraFlow Public

    Data processing toolkit for time-resolved X-ray experiments at PAL-XFEL

    Jupyter Notebook 7

  2. codigest codigest Public

    Turn your codebase, diffs and terminal output into LLM-ready context. CLI + MCP server for AI coding agents.

    Rust 1

  3. NaNIsaac-Research/TraTT NaNIsaac-Research/TraTT Public

    Time-dependent dynamical X-ray diffraction (Takagi-Taupin) for transient acoustic Bragg satellites

    Python 1

  4. roi_rectangle roi_rectangle Public

    Rectangular regions of interest (ROI) for images and NumPy arrays

    Python 1

  5. hanfix hanfix Public

    Fix and re-run commands typed with the Korean keyboard layout on (2-set <-> QWERTY)

    Rust

  6. QoraPhase QoraPhase Public

    JAX-native, composable phase retrieval for coherent diffraction imaging (CDI, BCDI)

    Python 1