If I recall correctly, you are a practitioner of the martial arts. Why would you need a knife ?
I've never had to use a knife in self defense. That being said, I always carry (as open as possible) so its visible. I mainly carry it for random reasons we all need knives. Secondly for protection. But a visible weapon (I'm told by many police friends of mine) will scare off most random attacks or muggings. Its kind of like an ADT sticker and robberies. You dont even need an alarm system to scare the robbers off.
Best advice is, if you are coming to A/C to live, leave your knives at home....Rambo's not welcome here..
No rambos? What about ninjas?