Generating the FDFD modeling by applying the Preconditioner

This is what happens when you feel lucky on google with 'fdfd' as a search term.

"Qiuzhao Dong, Misha Kilmer and Carey Rappaport

Based on the Perfectly Matched Layer (PML) Absorbing Boundary Condition (ABC), Finite Difference Frequency Domain(FDFD) modeling is generated by applying the preconditioner which is especially important in 3-dimensional FDFD modeling (it hastens the computational rate.). The theoretical basis for constructing the preconditioner in the frequency domain is presented and the general grid geometry for FDFD modeling is discussed. The 3D FDFD modeling is testified by comparing its result for the electrical filed distribution of the simple dipole in the free space to the theoretical result and comparing its 2-dimensional effect for point source to the result from the 2D FDFD modeling . Some particular target cases are carried out. But the 3D FDFD generates a very large matrix (although it is very sparse), it need to occupy a corresponding large memory. Due to the restriction of our computational resources, the large size case can not be afforded here. "

I dont know about you, but this stuff is pretty heavy duty. I even read the pdf they refer to, lots of pretty colored pictures, jargon, and bad english.