First Author:   Chun-Lei Yang Academia Sinica cly@gate.sinica.edu.tw   Research Center for Humanity and Social Sciences, Academia Sinica Taipei, 115, R.O.C.   886-2-27898161(Phone) 886-2-27898161(Fax) Second Author: Jack Yue National Chengchi University csyue@nccu.edu.tw   Mucha, Mucha Taipei, 11623, R.O.C.   886-2-29387695(Phone) 886-2-29398024(Fax) http://csyue.nccu.edu.tw