Ju Ho Kim

Statistics, CDSS @ Cal
馃搷 SF Bay Area

Blog

Marginalia.

2026

  • Row-Level Security for AI Agents

    A new agent training paper from Google rebuilt the wrapper I already wrote in Postgres

    AI Agents 路 Row-Level Security 路 PostgreSQL 路 Data Engineering

  • Row Store vs. Columnar Store

    Why the same table laid out two ways gives us two different databases

    Row Store 路 Columnar Store 路 Databases 路 Data Engineering

  • OLTP vs. OLAP

    Why small transactions and big scans need two different kinds of databases

    OLTP 路 OLAP 路 Databases 路 Data Engineering

  • Probability Foundations: From Counting to Continuous Distributions

    Probability (3)

    Probability 路 Chebyshev 路 Markov 路 Indicator Method 路 Poisson Process 路 Gamma 路 Exponential 路 Normal Approximation 路 Hypergeometric 路 Bayes

  • Random Variables, Expectation, Variance, Normal Approximation, Discrete Distributions, Poisson, Symmetry

    Probability (2)

    Random Variables 路 Expectation 路 Variance 路 Normal Approximation 路 Geometric 路 Poisson 路 Hypergeometric 路 Symmetry

  • Conditional Probability, Bayes' Rule, Counting, Binomial, Poisson & Normal Approximations, Hypergeometric Sampling

    Probability (1)

    Conditional Probability 路 Bayes' Rule 路 Counting 路 Multinomial Coefficient 路 Binomial 路 Poisson Approximation 路 Normal Approximation 路 Hypergeometric Sampling

  • 02. Came back to Berkeley, after winter break

    Happy new year!

    2026 路 Happy new year

2025

  • Trees, Mutability, Iterators

    [CS 61A] Study Notes - 6

    Trees 路 Mutability 路 Iterators 路 CS 61A 路 Structure and Interpretation of Computer Programs

  • Sequences, Containers, Data Abstraction

    [CS 61A] Study Notes - 5

    Sequences 路 Containers 路 Data Abstraction 路 Python 路 CS 61A 路 Structure and Interpretation of Computer Programs

  • Recursion, Tree Recursion

    [CS 61A] Study Notes - 4

    Recursion 路 Tree Recursion 路 Python 路 CS 61A 路 Structure and Interpretation of Computer Programs

  • Higher-Order Functions

    [CS 61A] Study Notes - 2

    Higher-Order Functions 路 Python 路 CS 61A 路 Structure and Interpretation of Computer Programs

  • Functions, Control

    [CS 61A] Study Notes - 1

    Functions 路 Control 路 Python 路 CS 61A 路 Structure and Interpretation of Computer Programs

  • 01. My Journey Begins Here

    I got into UC Berkeley

    Enjoyable Adventure 路 Silicon Valley 路 San Francisco 路 Bay Area 路 Berkeley