MLX Data Manager
A data management system designed for machine learning workloads, offering a Hugging Face-compatible interface for ease of adoption, along with data version control and lineage tracking.
Projects
Highlights from recent roles, then other workplace projects and the archive.
Highlights
Hand-written Font Generator
Given a sheet of handwritten paper, generate a font that resembles the handwriting.
Data Lake
Ingested and aggregated operational data—from Kafka into S3 (ORC format)—for analytics, ensuring integrity with deduplication and exactly-once delivery semantics.
Previous Works
- Flow (Inter-domain logistics state management system) Handling write-heavy workloads with Cassandra and message ordering guarantee with a distributed queue.
Flow (Inter-domain logistics state management system)
Handling write-heavy workloads with Cassandra and message ordering guarantee with a distributed queue.
- Ecosystem Pipeline (Durango) Distributed pipeline so the simulator runs in bounded time as the world grows: Dockerized jobs, spatial chunking, and "no audience, no play" cost control.
Ecosystem Pipeline (Durango)
Distributed pipeline so the simulator runs in bounded time as the world grows: Dockerized jobs, spatial chunking, and "no audience, no play" cost control.
Read write-up → - Ecosystem Simulator (Durango) Procedural world vegetation driven by soil, climate, and biomass rules—scaling heavy simulation with precalculation and GPU-friendly workloads.
Ecosystem Simulator (Durango)
Procedural world vegetation driven by soil, climate, and biomass rules—scaling heavy simulation with precalculation and GPU-friendly workloads.
Read write-up → - Durango — server & overview Distributed MMORPG server at Nexon—overview of the system and how ecosystem sim, pipeline, and related pieces fit together.
Durango — server & overview
Distributed MMORPG server at Nexon—overview of the system and how ecosystem sim, pipeline, and related pieces fit together.
Archive
Older work and side projects
Base62
A Python library to encode and decode any arbitrary data in base62 (duosexagesimal; using 0-9, A-Z, and a-z) for URL-safety. I was recently able to convince my colleagues to use this library for work.
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BOINC
Contributing compute to BOINC—on the order of 127 GFLOPS on average for climate modeling, prime search, stellar-stream simulations, and similar projects.
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Dollar Auction
An improvised marketplace to sell underused personal belongings where every auction starts at KRW 1,000 (approximately USD 1).
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Hanja
A Python library to read Chinese characters in Korean sound values (음독).
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Interview Questions
Curated a collection of interview questions and solutions from various tech companies, for personal reference and to support fellow engineers preparing for interviews.
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Coding Expedition
Writing code away from home—cafés, road trips, and a map of places. Longer story and map on this page.
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SB Coding Workshop
Workshop materials and exercises for teaching Python.
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Secor
Upstream work on Pinterest Secor (Kafka to cloud storage), including handling map types in message serialization. Pull requests: #982, #965, and other authored PRs.
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Better Translator
A language translator that uses Japanese as an intermediate language. Processes +20,000 translation requests on a daily basis (as of Sep 2013).
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Smartrek
An ambitious project to solve urban traffic congestion problems. My primary responsibility in the team is to build a scalable system with Amazon EC2 platform, and to build in-house software for data analysis.
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Winnowing
A Python implementation of the Winnowing (local algorithms for document fingerprinting)
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ChemBook
An iOS app to help students with writing chemistry lab reports.
Purpose-built Appliance
Pending paper publication to PLOSone
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Radioactivity
The project radioactivity had started in March of 2011 in an attempt to help the general public to be alerted regarding the spread of radiation and other radioactive materials originated from the catastrophic incident in the Fukushima nuclear power plant in Japan, by providing visual information of city-wise radition levels.
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gdocsdb
A Python library to use Google Spreadsheet as a database.
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Kindleholic
An RSS/Atom feed aggregation service for Amazon Kindle.
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Slow Drivers
Visit →Teach Ourselves
A project to create a society for students in which learning and creativity is rewarded with points that can be redeemed for goods.
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한자-한글 변환기
The name of the project is self-explanatory.
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Bootstrapped Learning
A DARPA sponsored project to develop an electronic student that can learn from natural human instruction close to the way humans do.
Chemtalk
Visit →maps
A project to reconstruct a map in global scale by collecting map tiles from various sources such as Google Maps and Open Street Map.
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Readown
A Markdown reader for Mac OS X.
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Violet
A children's book for iPad with user-interactable animations.
Notehall
Visit →CQube
A labyrinth-like puzzle game for iPhone.
Mandelbrot set
A distributed processing project to draw a mandelbrot set using multiple computers.