Korean nose surgery for bulbous tip - what techniques are used?

I have a bulbous nose tip that I have been self-conscious about for years. I have researched that Korean plastic surgeons have special techniques for refining the nose tip while maintaining an ethnically appropriate look. Can anyone explain what techniques Korean surgeons typically use for bulbous tip correction? I have heard terms like tip plasty, alarplasty, and columellar strut grafts. What is the difference between these? Also, do Korean surgeons usually perform open or closed rhinoplasty for tip work? I want a more refined tip but still want my nose to look natural and suit my face.