[KS] Korean language transliteration system

[Jaenam1004 at aol.com]

I would like to find out what is the dominant transliteration system in the U.S.  Is the Korean government transliteration system in wide use in the U.S., or is it not used at all?  What is the transliteration system as far as cataloguing is concerned?  What is the transliteration system as far as teaching Korean in Korean language classes are concerned?  Does anyone know which Korean transliteration system the Library of Congress uses, and which Korean transliteration system Harvard Yenching library uses?  Thanks.

Jaenam Kim