Thank you guys for your replies. I realized there's some non-clarity in my description so let me clarify a bit more:
I am looking into applying to a US university as a junior transfer in fall 2013. I have been studying at UC Davis as an exchange student from China and I am going to attain 48 quarter units from UCD by the end of my time there and then return to China in Dec to continue my study at my home university. So I will apply as an international transfer. My one year in UCD is only study-abroad.
I emailed the admin office of Cornell and Dartmouth. They told me students who exceed 2 years of college coursework are ineligible to apply as transfers for their schools;Some other vaguely say students like me are "discouraged" to apply because of the 2 year in residence requirement after matriculation; One admin officer in Georgetown told me they don't care about my standing; I haven't asked USC yet but I know a student from my univeristy in China ended up transferring to there when she was also in her 3rd year.
I just want to gather more information in regards to whether the fact that I have more than 2 years of college coursework would be a negative factor in my application, or, even worse, make me totally ineligible to apply.
Here's some of the schools I am considering:
NYU, Georgetown, Johns Hopkins, USC, Washington Univ. in St Louis, Rice, Vanderbilt, UVa, Barnard College, Northwestern, Univ. of Michigan Ann Arbor...