How to change skill cooltime?

I want to know how to change the skill cooldown time.
Please tell me anyone....

I changed the columns "cooltime" of some table and some dnt.
But not changed...

I could it.
About the skill no cooldown.

<Change files>

-skillleveltable_character(any).dnt
--_DelayTime -> all 0

-skilltable_character.dnt
--_GlobalCoolTimePvE, _GlobalCoolTimePvP, _GlobalSkillGroup, _SkillGroup -> all 0

-the pak file name which was created by those dnts
--those dnts contain in the original Resource00.pak.
--If you create the pak file by the PakPacker.exe, you have to do the name which read first by the system.

ex)
Resource00.pak-Resource10.pak
-> Resource01.pak-Resource11.pak
Then the file name which were created by the PakPacker.exe is "Resource00.pak".