Posts
All the articles I've posted.
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The study method I made for myself — 5 steps for learning new technology (prerequisite knowledge → typing out code → applying to real cases → reading others' code → writing it up)
I tried both the terminology + playground approach and the type-out-code approach, and found the latter suits me better. Based on that realization, I've laid out a 5-step order for learning new technology going forward. Next time I learn something new, I'll come back to this post and follow the steps.
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Building a RAG Q&A System with Chroma + My Blog — From Parts to System
Yesterday I played with the parts of RAG (embedding / cosine similarity / chunks). Today, I put them together into a system. I introduced the Chroma vector DB, indexed 270 chunks from my blog, and built a Q&A system with OpenAI + Claude. The most memorable moment was when it answered 'I don't know' to a question about information not covered on my blog.
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Building RAG from Scratch — Embedding, Cosine Similarity, Chunk Search (with Korean vs English Comparison)
Carving out the inside of RAG (Retrieval-Augmented Generation) with actual code, from what embedding even is to debugging suspicious results. I pulled 1536-dimension vectors with OpenAI's text-embedding-3-small, compared them with cosine similarity, compared Korean vs English performance, and worked through chunk splitting. Surprisingly, Korean embedding similarity turned out to be lower.
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API Design Vocabulary for Vibe Coding — REST, Status Codes, Idempotency, Pagination, Authentication/Authorization
Part 3 of the terminology series. After creating DB tables, how do you expose those resources to the outside world? 5 core vocabulary terms to escape the vague instruction 'build me an API' — REST, status codes, idempotency, pagination, authentication/authorization — plus bonus CORS. I set up a separate playground where you can try out the core concepts hands-on.