I have submitted my Master thesis manuscript to the university library. It is completely new work (never published before to any journal or conference). Now, I want to submit my Master thesis to a journal (as a paper) without modifying it much/anything. Is it ethical/legal to publish your Master thesis manuscript as a journal paper? Should I mention this to the editor of the journal? Because, in the journal guidelines, it says: we accept the manuscript only if it is not published before to any journal or conference. It does not mention anything about other publication sources (like: Master or PhD thesis submitted to the university library). Will I face any problem in future if I do so?
PS: I am thinking to submit it in IEEE Transactions on Computers journal. I talked with the university librarians. They told me they do not have any problem if it is published elsewhere. They just keep a copy in the university library (including online library - which I can also keep 'private'). I am asking if the journal has any problem or not? For my university, it does not really matter (since I have already given the manuscript to them and they have accepted it). My university is in Republic of Korea.