Webin, I don’t think the Professor is going to appreciate your pestering him when he gets back from his vacation.
Please learn some posting eticette and your signature will likely return, nagging is likely to have the opposite effect.
Oh, and I noticed today that you started another post called “hello”. I told you once before not to do that.
The title of a post should tell people what the content will be. Hello is not helpful, and it is starting to get annoying, not sure how many posts named “hello” you have now.
Now be good, and have a happy new year.