Kyoung Ho Kim | Searcharxiv

arXiv2026

Ground Effects of the 2024 Mother's Day Superstorm: A Multi-source Observational Analysis

This report presents a brief review of the 2024 Mother's Day superstorm and its impacts on the near-Earth space environment and the ground-level effects, with emphasis on the latter. Drawing upon observations from multiple sources. we qualitatively illustrate how intense space weather disturbances can generate strong geoelectric fields and drive pronounced geomagnetically induced currents, as reported at numerous locations, particularly within the New Zealand power grids.

physics.space-ph↗

arXiv2019

Oldie is Goodie: Effective User Retention by In-game Promotion Event Analysis

For sustainable growth and profitability, online game companies are constantly carrying out various events to attract new game users, to maximize return users, and to minimize churn users in online games. Because minimizing churn users is the most cost-effective method, many pieces of research are being conducted on ways to predict and to prevent churns in advance. However, there is still little research on the validity of event effects. In this study, we investigate whether game events influence the user churn rate and confirm the difference in how game users respond to events by character level, item purchasing frequency and game-playing time band.

cs.HC↗