Kyoto University, Japan - 2025
UnPAB, Medan, Indonesia - 2024
USU, Medan, Indonesia - 2024
IPB, Bogor, Indonesia - 2023
Tohoku University, Sendai, Japan - 2022
Tokyo, Japan - 2019
Speaker at the Introduction to Big Data in Social Science Workshop 2018, Faculty of Educational Studies, Universiti Putra Malaysia, 2018.
Guest speaker at the Research Presentation Session in Data Science Week 2017, Asia Pacific University of Technology and Innovation, 2017.