During this week, I have worked on the follows:

1) identify the problem pointed out by Dave.
It does have the problem in derivation.
However, I have figured out a correct stamping 
in of L^-1 using VNA.
I'll do some experiement to verify it;

2) working one src proposal. 
find some new problems that may be 
interesting to work. 
pls check the details in the proposal.