ML systems, geospatial intelligence, document AI

Stellamaris Na

An Applied Research Scientist adapting computational intelligence to ML/AI systems & real-world messy data:neural retrieval, document intelligence, geospatial imaging, and scientific data infrastructure.

I am curious and enthusiastic about SYSTEMS: ML Computing Systems, Data Systems, Knowledge Production Systems, Governance Systems.

I prototype, compute algorithms and execute intelligent systems that create solutions that are resilient for real world unstructured and geometric data.

My daily tasks involve cross-functional teams collaborations to create and deliver unprecidented approaches towards unyielding industrial challenges with application of computing, and more - from research framing through prototype, evaluation, and production handoff. My current work and interests include;

Document intelligence and multimodal AI

I prototype and evaluate extraction pipelines for mixed-format document corpora.

I design table and layout understanding workflows for noisy, heterogeneous reports.

I help teams productionize ingestion, validation, and downstream integration for document intelligence systems.

Computer vision, imaging, and geospatial AI

I develop segmentation and imaging workflows for material, mapping, and scientific-data problems.

I design geospatial ML and computer vision architectures for earth systems, infrastructure, and resource assessment work.

I build benchmarks that reflect operational limits instead of clean-room assumptions.

ML systems - GPU and distributed computing

I translate mathematical concepts into algorithmic systems and testable engineering roadmaps.

I design scalable ETL, model development, and inference strategies for teams working with large or irregular datasets.

I work with product, research, and engineering teams to move from open-ended questions to measurable systems.

Research, publications, experience, & Life.

A decomposed record of the work: what I am studying, what I have published or built, and the roles that shaped the current research direction.

Research and systems work

2026
Thesis

Architecture resilience under network degradation

Harrisburg University - FAISS, HNSW, IVF, neural retrieval, energy per query

This thesis stress-tests embedding retrieval architectures across controlled degradation conditions: baseline, bandwidth constraints, high latency, and packet loss. The work compares how HNSW and IVF fail differently, and treats recall, latency, and energy per query as linked system outcomes.

2026 thesis stability sweep chart for retrieval architectures

2025
Preprint

Numerical smoothing of noisy evaluation surfaces

ML evaluation, ROC/PR geometry, threshold optimization

Co-authored work reframing binary classifier evaluation as a numerical conditioning problem. The project connects ROC, PR, and F1 behavior on a differentiable surface and studies which bounded optimization routines produce stable thresholds under noisy empirical metrics.

2025 preprint visual

2024
Product

AIPDF2Table

Document intelligence, structured extraction, heterogeneous PDFs

A document-intelligence utility for recovering structured tables from reports that vary in layout, encoding, and schema. The core problem is disambiguation: merged cells, multi-header tables, rotated layouts, and documents that were never designed for machine reading.

2024 product visual
View GitHub profile

Ongoing
Notes

Parallel and distributed systems notes

Parallel programming, decomposition, agglomeration, ML systems

A chapter-by-chapter study of parallel computing applied to machine learning systems and large-scale data structures. The separate Parallel Systems page keeps its own terminal-inspired IBM Plex and Syne style.

Open Parallel Systems Notes

Publications and scholarly outputs

  • 2024 Digital humanitarians for the sustainable development goals: YouthMappers as a hybrid movement. 34 cites
  • 2024 Open mapping towards sustainable development goals: voices of YouthMappers on community engaged scholarship. 23 cites
  • 2024 WELLBASE: A standardized data infrastructure for well log analytics. peer-reviewed
  • 2024 ROKBASE: Rock sample database for imaging deep learning applications. peer-reviewed
  • 2024 A national critical minerals and materials prospectus and resource assessment methodology. output
  • 2023 Lite Learning: efficient crop classification in Tanzania using traditional machine learning and crowd sourcing. output
View Google Scholar profile

Experience and resume

2023 - present

AI/ML R&D Science and Engineering

Leidos / NETL

Embedding knowledge systems and computer vision for mineral regimes, with mathematical models and pipelines that reconstruct fragmented oil-and-gas records into usable national science assets.

2024 - 2026

Graduate research

Harrisburg University

Computing systems and algorithms research focused on retrieval architecture resilience, parallel systems, benchmarking, and realistic network conditions.

2021 - 2022

Graduate Research Assistant

West Virginia University

Research on ML training data and large-data system design, including losses created by schema variation in open-source data.

2017 - 2023

Program Director, Regional Training

YouthMappers

Expanded open-science curriculum for GIS and ML application, created open geospatial datasets, and supported a global community of students, practitioners, and researchers.

2018 - 2020

Geospatial Subject Matter Expert

LANDnet / policy research

Mapped and advised schema variations for land-data mapping and national record digitisation, with work spanning data management, processing, and software development.

PDF
PPTX

Resume and summary deck

The full resume includes roles, publications, projects, and technical skills in a downloadable PDF. The summary deck offers a quick PowerPoint overview of the same record.

Selected experiments and projects

  • Mobility Behavioral signal extraction from COVID-19 lockdown mobility data. GitHub
  • Energy Infrastructure adoption as a spatial problem through U.S. EV charging growth. GitHub
  • Air Scrapy-based EPA AirNow collection pipeline for geospatial air quality analysis. GitHub
  • Forecasting Comparative study of ARIMA, Prophet, and deep learning forecasting models. GitHub
  • OCR Early document intelligence tests for recovering structured data from difficult documents. GitHub
  • GPU Floyd-Warshall CPU/GPU benchmarking and PCAM methodology experiments. GitHub

My Reading Room

Away from research, I keep a small room for books, philosophy, historical fiction, films, and the story worlds that help me think more slowly.

Enter the Reading Room