[IEEE 2013 Joint IEEE Int'l Symp on Applications of Ferroelectrics & Workshop on Piezoresponse Force Microscopy (ISAF/PFM) - Prague 4, Czech Republic (2013.07.21-2013.07.25)] 2013 Joint IEEE International Symposium on Applications of Ferroelectric and Workshop on Piezoresponse Force Microscopy (ISAF/PFM) - Precise determination of piezoelectric longitudinal charge coefficients for piezoelectric thin films assisted by finite element modeling