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[yukihiro_okuno@fujifilm.co.jp]

Dear Chol-Jun Yu.

As already Ricinski said, I think the PbTiO3 results is 
reasonable. But BiScO3, I think it will be more bigger than 
your estimated value.  The Berry phase has ambiguity of e*c/Omega (2pi for 
phase), so there may be discontinuity of thie module term.
For the evaluation of spontanious polarization, we gradually
change the atomic position fromt reference state to the ferro 
electric state. I reccomend you to calculate several points 
along the adiabatic path to the ferroelectric state. 

Yukihiro Okuno.