Change keys for 'new tab' and 'close tab' in vim

.vim/vimrc

@@ -109,8 +109,8 @@ imap <c-@> <c-x><c-o>
 
 nmap <c-s-left> :tabprevious<cr>
 nmap <c-s-right> :tabnext<cr>
-nmap <c-t> :tabnew<cr>
-nmap <c-k> :tabclose<cr>
+nmap <c-s-up> :tabnew<cr>
+nmap <c-s-down> :tabclose<cr>
 
 nmap <c-x> :bw<cr>