Youhan Lee is a senior researcher of the Korea Atomic Energy Research Institute. He has a deep interest in using machine learning techniques to solve industrial problems. He is a Competition Master at Kaggle. He participated in over 30 competitions and won 4 gold medals (two 3rd, one 7th, and 11th) at Kaggle. He earned his Ph.D. in Chemical Engineering from Korea Advanced Institute of Science and Technology. Youhan organizes "Kaggle Korea", which is a non-profit Facebook group community. Kaggle allowed us to make the community. In this community, He shares many articles, news or anything about machine learning, deep learning, and data science.