Jiho Choi

I am a 3rd-year data scientist at Netmarble AI Center. I received M.S. in Computer Science & Engineering from Seoul National University, where I was privileged to be advised by Prof. Chong-kwon Kim. I received B.S. in Computer Science from Purdue University, West Lafayette. My research interests include data mining and graph neural networks.

Curriculum Vitae (CV)

Under Reconstruction

I am currently reconstructing my portfolio web () and the server.
Please visit GitHub or LinkedIn for more information. 😀
Seoul National University Seoul National University
nodesktop

Education

Seoul National University, Seoul, Republic of Korea

M.S. in Computer Science & Engineering, 2018 - 2020
Seoul National University

Purdue University, West Lafayette, IN, USA

B.S. in Computer Science, Dec. 2017
  • Relevant Coursework:
    • Systems: Compilers, Operating Systems, Computer Networks, Database Systems, Computer Security, Systems Programming
    • Software Engineering: Software Engineering, Software Testing, Object-oriented Programming
    • Computational Science & Engineering: Numerical Methods, Differential Equations, Analysis of Algorithms, Competitive Programming
  • Individual Research: Cloud Computing Security
Purdue University

Experience

Data Scientist

Netmarble Corp., Seoul, South Korea, Sep. 2020 - Current

  • Data Science Division / Abnormal User Information Team
SCONE

Graduate Research Assistant

Social & Computer Network Lab. @ SNU, Seoul, South Korea, Jan. 2018 - Aug. 2020

  • Graph Neural Networks
SCONE

Software Development Engineer Intern

NAVER LABS Corp., Seongnam, Gyeonggi, South Korea, Jul. 2019 - Jan. 2020

  • Slides: / Demo:
NAVER LABS

Software Engineering Intern

Fasoo Inc., Seoul, South Korea, May. 2017 - Aug. 2017

FASOO
(Teaching Assistant)

Engineering Mathematics 2 (Probability) @ SNU

Graduate Teaching Assistant, Spring 2018

Computer Architecture @ Purdue University

Undergraduate Teaching Assistant, Fall 2016, Spring 2017, Fall 2017

Research

Interest:

  • Social Network Analysis & Evolving Graph
  • Graph Mining & Graph Neural Network
  • Data Mining & Machine Learning

Publications

Refereed Conference Publications

(* indicates equal contributions)
    • PU GNN: Chargeback Fraud Detection in P2E MMORPGs via Graph Attention Networks with Imbalanced PU Labels
    • Jiho Choi*, Junghoon Park*, Woocheol Kim, Jin-Hyeok Park, Yumin Suh, Minchang Sung
    • ECML PKDD 2023 (Applied Data Science Track) (Acceptance rate: 24.3 % (= 58 / 239))
    • Finding Heterophilic Neighbors via Confidence-based Subgraph Matching for Semi-supervised Node Classification
    • Younhyuk Choi, Jiho Choi, Taewook Ko, Hyungho Byun, Chong-kwon Kim
    • ACM CIKM 2022 (Acceptance rate: 27.5 % (= 621 / 2257))
    • Review-Based Domain Disentanglement without Duplicate Users or Contexts for Cross-Domain Recommendation
    • Younhyuk Choi, Jiho Choi, Taewook Ko, Hyungho Byun, Chong-kwon Kim
    • ACM CIKM 2022 (Acceptance rate: 27.5 % (= 621 / 2257))

Journal Publications

    • Dynamic Graph Convolutional Networks with Attention Mechanism for Rumor Detection on Social Media
    • Jiho Choi, Taewook Ko, Younhyuk Choi, Hyungho Byun, Chong-kwon Kim
    • PLOS ONE 2021 (SCIE)

Domestic Publications

    • Feature Extraction from a Diffusion Network for Rumor Classification in Social Media
    • Jiho Choi, Sihyun Jeong, Chong-kwon Kim
    • KIISE Transactions on Computing Practices, Vol.26, No.2, Feb. 2020.
    • Feature Extraction of Diffusion Network for Rumor Classification in Social Media
    • Jiho Choi, Sihyun Jeong, Chong-kwon Kim
    • Korea Computer Congress 2019. (Best Presentation Award)

Projects

TO BE UPDATED

Previews & source code will be updated soon.

Bot Detection in MMORPGs

Bot Detection Model for Collusive Workers, Macro, and Automated Programs in Online Games

Anomaly Detection in Online Games

Anomaly Detection Model for Game Hack, Memory Manipulation, and Bug Abusing (Glitch)

Payment Fraud Detection in P2E MMORPGs

PU GNN: Chargeback Fraud Detection in P2E MMORPGs via Graph Attention Networks with Imbalanced PU Labels

LiDAR Registration Tool

Point Cloud and Aerial Image Annotation Tool (Client-side)

Diffusion Network Analysis

Rumor Diffusion Network Analysis for Message Classification in Social Media

Movie Network Analysis

Graph Mining and Network Analysis Project

Kernel Modification

Process Scheduling, Inter Process Communication, ... Projects for XINU OS

File Sharing System

uTorrent like Remote File Sharing System built with Socket Programming

Mini Scalar

Programming Language Implementation, Interpreter / GC (VM) Modification

My Own Shell

Bash like Shell Implementation with Lax/Yacc

Sniff & Spoof

Packet Sniff & Spoof Project, Man-in-the-middle attack
(CS426 Computer Security @ Purdue University)

Projects in Distributed Systems

Projects in Apache Kafka, Hadoop, Spark, Hive, Storm, Beam, Nemo
(DB, CCS @ Purdue, BDDL @ SNU)

Sentinel Data Vault

GUI DB managing software support encryption (salting)

Classmate Finder

Bulletin Board Style Classmate Finder Application built with Node.js