I thank Associate Professor Tan Tin Wee.  His witty style has given me much fun in learning.

I thank Dr. Chua Kim Lee and Gan Yunn Hwen for the advice and consultations they gave me.

     I particularly want to thank my friends Chen Zhuo and Wang Ping, for the countless advice and help they gave me.

     I also thank Kwan Cainan and Huang Bo.  It is a great experience to encourage and help each other.