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. 2018 Sep 3;18(9):2916. doi: 10.3390/s18092916

Figure 2.

Figure 2

Pavement models used to simulate the training data for MLPs. (a) The two layer pavement model. (b) The three layer pavement model. The first layer of both the two models is a thin layer with respect to the pulse width. The second layer of the three layer pavement model is a thick layer with respect to the pulse width. The electric conductivities of all layers are assumed to be negligible.