---
title: "Yejun Park (@yejun) | Hashnode"
description: "Yejun Park (@yejun) writes on Hashnode. Read their latest articles and follow their work."
url: "https://hashnode.com/@yejun"
---

@yejun

# Yejun Park

@yejun · Joined April 2026

### [Virtual Memory Demystified: How Your Computer Runs Programs Bigger Than Its RAM](https://yejunpark3.hashnode.dev/virtual-memory-demystified-how-your-computer-runs-programs-bigger-than-its-ram?utm_source=hashnode&utm_medium=feed)

A deep dive into one of operating systems' most elegant illusions — demand paging, page faults, replacement algorithms, and thrashing

16 min read · [yejunpark3.hashnode.dev](https://yejunpark3.hashnode.dev/virtual-memory-demystified-how-your-computer-runs-programs-bigger-than-its-ram?utm_source=hashnode&utm_medium=feed)

[Jun 2](https://hashnode.com/posts/virtual-memory-demystified-how-your-computer-runs-programs-bigger-than-its-ram/6a1e9d28307f6a5bf34369f2)

### [How Modern Operating Systems Manage Memory: A Deep Dive into Paging](https://yejunpark3.hashnode.dev/how-modern-operating-systems-manage-memory-a-deep-dive-into-paging?utm_source=hashnode&utm_medium=feed)

A deep dive into paging: pages, frames, TLBs, protection bits, and why 64-bit systems redesigned page tables.

16 min read · [yejunpark3.hashnode.dev](https://yejunpark3.hashnode.dev/how-modern-operating-systems-manage-memory-a-deep-dive-into-paging?utm_source=hashnode&utm_medium=feed)

[May 31](https://hashnode.com/posts/how-modern-operating-systems-manage-memory-a-deep-dive-into-paging/6a1c30c3bbf6e6838177fc12)

### [From Thousands of Features to a Few: A Deep Dive into Dimensionality Reduction](https://yejunpark3.hashnode.dev/from-thousands-of-features-to-a-few-a-deep-dive-into-dimensionality-reduction?utm_source=hashnode&utm_medium=feed)

Dimensionality reduction: why it matters, key challenges (curse of dimensionality, redundancy), and techniques to compress high-dimensional data.

13 min read · [yejunpark3.hashnode.dev](https://yejunpark3.hashnode.dev/from-thousands-of-features-to-a-few-a-deep-dive-into-dimensionality-reduction?utm_source=hashnode&utm_medium=feed)

[May 30](https://hashnode.com/posts/from-thousands-of-features-to-a-few-a-deep-dive-into-dimensionality-reduction/6a1acfe5fd30dc1666f44960)

### [From One Neuron to Deep Learning: A Complete Guide to Multi-Layer Perceptrons](https://yejunpark3.hashnode.dev/from-one-neuron-to-deep-learning-a-complete-guide-to-multi-layer-perceptrons?utm_source=hashnode&utm_medium=feed)

Walkthrough from Rosenblatt's perceptron to modern MLPs — history, math, training, and intuition behind deep learning.

15 min read · [yejunpark3.hashnode.dev](https://yejunpark3.hashnode.dev/from-one-neuron-to-deep-learning-a-complete-guide-to-multi-layer-perceptrons?utm_source=hashnode&utm_medium=feed)

[May 27](https://hashnode.com/posts/from-one-neuron-to-deep-learning-a-complete-guide-to-multi-layer-perceptrons/6a167f58da253d50d41a612f)

### [How Your Computer Pretends Every Program Owns All the Memory: A Deep Dive into Paging](https://yejunpark3.hashnode.dev/how-your-computer-pretends-every-program-owns-all-the-memory-a-deep-dive-into-paging?utm_source=hashnode&utm_medium=feed)

A practical journey from "where does printf actually live?" to why your 64-bit CPU needs a hardware cheat sheet to stay fast.

14 min read · [yejunpark3.hashnode.dev](https://yejunpark3.hashnode.dev/how-your-computer-pretends-every-program-owns-all-the-memory-a-deep-dive-into-paging?utm_source=hashnode&utm_medium=feed)

[May 26](https://hashnode.com/posts/how-your-computer-pretends-every-program-owns-all-the-memory-a-deep-dive-into-paging/6a153fe77d85e6a1af47954b)