---
title: "Joshua Junsu Kim (@croooquis) | Hashnode"
description: "Sharing thoughts on developer experience and tooling. Read the latest articles by Joshua Junsu Kim on Hashnode."
url: "https://hashnode.com/@croooquis"
---

@croooquis

# Joshua Junsu Kim

@croooquis · Seoul, South Korea · Joined July 2026

Sharing thoughts on developer experience and tooling.

### [The Euclidean Sinkhole: Why Local Dense Vector RAG Fails at Personal Knowledge Sensemaking](https://junsukim.hashnode.dev/the-euclidean-sinkhole-why-local-dense-vector-rag-fails-at-personal-knowledge-sensemaking?utm_source=hashnode&utm_medium=feed)

An empirical breakdown of context fragmentation, multi-hop blindness, and global synthesis bottlenecks in flat FAISS/L2 spaces—and why personal vaults demand graph topologies.

8 min read · [junsukim.hashnode.dev](https://junsukim.hashnode.dev/the-euclidean-sinkhole-why-local-dense-vector-rag-fails-at-personal-knowledge-sensemaking?utm_source=hashnode&utm_medium=feed)

[Jul 6](https://hashnode.com/posts/the-euclidean-sinkhole-why-local-dense-vector-rag-fails-at-personal-knowledge-sensemaking/6a4b98b72c35a96c3a7188ce)

### [Spectral Graph Embeddings & Bipartite Bridging: Controlling Data Sparsity Without LLM Semantic Drift](https://junsukim.hashnode.dev/spectral-graph-embeddings-bipartite-bridging-controlling-data-sparsity-without-llm-semantic-drift?utm_source=hashnode&utm_medium=feed)

Why linear-algebraic matrix factorization is identical to graph representation learning, and how to bridge Out-of-Vocabulary (OOV) terms in specialized domains without destroying personal subjectivity.

6 min read · [junsukim.hashnode.dev](https://junsukim.hashnode.dev/spectral-graph-embeddings-bipartite-bridging-controlling-data-sparsity-without-llm-semantic-drift?utm_source=hashnode&utm_medium=feed)

[Jul 6](https://hashnode.com/posts/spectral-graph-embeddings-bipartite-bridging-controlling-data-sparsity-without-llm-semantic-drift/6a4b915ebd86ee0325f44f0a)