18 lines
2.3 KiB
Markdown
18 lines
2.3 KiB
Markdown
---
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title: Projects
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tags: meta
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---
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Index of engineering artifacts. Systems depth is the primary axis of this page; machine-learning and deployed artifacts follow.
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## Low-Level & Systems
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- **[Weenix](/essays/weenix/)** — Unix-like kernel in ~7,000 lines of C. Virtual memory, VFS, system calls, threading, device drivers, interrupt handlers, and file systems; custom linker support for running userspace x86-64 ELF binaries. Originally a project from Brown CS 169 (Operating Systems with Lab), extended with further features like pipes and userspace preemption. January – May 2025.
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- **[Networking Stack from Scratch](/essays/networking-stack/)** — TCP/IP, RIP, UDP, and DNS in Go, supporting file transmission of up to 1 GB across networks of 8 virtual machines. Extended with a fully RFC-compliant SSH implementation (2,000+ additional lines) supporting sustained sessions of arbitrary length. October 2024 – July 2025.
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- **[Where Does SIMD Help Post-Quantum Cryptography?](/essays/where-does-simd-help-post-quantum-cryptography/)** — Hand-written AVX2 assembly for ML-KEM / Kyber. 35×–56× speedup over compiler-optimized C for core NTT arithmetic; 5.4×–7.1× end-to-end KEM speedup. Full statistical-analysis pipeline (Mann-Whitney U, Cliff's δ, bootstrapped CIs) on Brown's OSCAR HPC cluster. Phase 1 report and reproducible artifact public; Phase 2 (PAPI, RAPL) and Phase 3 (ARM NEON/SVE, RISC-V V) in progress. [Artifact](https://git.levineuwirth.org/neuwirth/where-simd-helps)
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## Machine Learning & Deployed
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- **[ICD-10-CM outcome calculator](https://levineuwirth.github.io/icd_embeddings/)** — public, read-only calculator for the permutation-invariant Deep Sets model underlying the paper currently under review at *JAMA Network Open*. Takes a diagnosis-code set; returns 30-day readmission and postdischarge mortality predictions with Integrated-Gradients attribution. [Preprint](/essays/beyond-comorbidity-indices/) · [Code](https://github.com/levineuwirth/icd_embeddings)
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- **[NeuroPose](/essays/neuropose/)** — 3D pose-estimation and kinematic-analysis system for neurological-recovery research in Liqi Shu's laboratory at Brown Neurology. Python/TensorFlow inference pipeline, MATLAB-based statistical post-processing, Rust backend with HTML/JS frontends. 20,000+ lines across four externally-funded sub-projects since 2023.
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