Also consider:

Kwon diagram 3a is the same as the diagrams describing the force plate, sensors and axes system seen in Kistler manuals and my Fig 1. However Kwon has drawn it upside down (180 degree rotation about the Y axes). Such that ‘γ’, ‘c’ or ‘Zo’ is still the negative offset from the plate axes to the plate surface in the plate axes system but drawn down on the page instead of up to the plate surface as is usually presented. The equations derived from this diagram (Kwon eqs. 6, 7, 8) are the same as the expressions for forces, moments and CoP as supplied by plate manufacturers and the same as what I have presented in the plate axes system.