Hi,
Yes, The guy is from Yahoo! I even sent email to him , but no response. My supervisor discussed with me for 1 hour , but still can't figure out and he asked me read more. So how did you continue your research work or your stuff without understanding that part. Just use the very good approximation value hi= p/4 in (4.2) (sorry , p is not correct, but i couldn't type in that value 180° =3.1415926)...?
thanks
linsey