Pham Huong, Student, Taiwan, Taipei, Taiwan, En-Chao Yeh, National Taiwan Normal Univ., Taipei, Taiwan, Yu-Chang Chan, Academia Sinica, Taipei, Taiwan, Chih-Hsiang Yeh, National Taiwan University, Department of Civil Engineering, Taipei, Taiwan and Kuo-Jen Chang, Nat'l Taipei Univ. of Tech, Taipei, Taiwan