Recommendations and Requirements
Larry Trask states: "It is possible to write an entire word or phrase in capital letters in order to emphasize it", but adds that "On the whole, though, it is preferable to express emphasis, not with capital letters, but with italics."
According to North Korean writing rules, names of leaders 김일성 (Kim Il-sung) and 김정일 (Kim Jong-il) must always be set off in bold.
Read more about this topic: Emphasis (typography)