Mathematics
Below are some notes I have written up for some courses I have taken or I gave. (Very Rough!)
 20181 Geometric Analysis: Yamabe Problem and Geometric flow (Sogang University, Mathematics, Prof. Pak Tung Ho) / daily updated (last updated: 20180608)
 20171 General Relativity (Sogang University, Physics, Prof. JeongHyuck Park) / revised (20190208)
Also, these are some slide files that were presented in several classes and seminars.
The following notes are available upon request (incomplete note/not open to public)
 Introduction to Partial Differential Equation (written in Korean)
 Existence of forward selfsimilar solution of NavierStokes for large initial data (review note of the work of JiaSverak)
 Lectures on elliptic and parabolic equations on Holder spaces (based on the book of Krylov)
 Introduction to Random process (based on the book of Krylov)
 LittlewoodPaley theory and KatoPonce inequality (based on the paper of Dong Li, Fractional Leibniz rules and KatoPonce inequality)
 Local wellposedness and gradient blow up of Burgers type equations

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Below are lecture notes on LaTeX (usually written in Korean)