[IEEE 2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Compatibility (EMC/APEMC) - Suntec City, Singapore (2018.5.14-2018.5.18)] 2018 IEEE International Symposium on Electromagnetic Compatibility and 2018 IEEE Asia-Pacific Symposium on Electromagnetic Compatibility (EMC/APEMC) - An optimized GPU accelerated pre-conditioned biconjugate gradient stabilized method to speedup the scalar potential finite-difference method