A device and a method for detecting the position of a developing unit mounted in an image forming apparatus are provided. A cluster typically includes a shared disk and at least two nodes referred to as an \u201cactive node\u201d where the application is processed, and a \u201cpassive node\u201d capable of processing the application in the event of an \u201cactive node\u201d failure. The exemplary method also comprises determining an areal misfit between the simulated data and the measured data representative of the plurality of observations of the region. The outer diffusion connection of the p-type transistor network is connected to the first dedicated logic terminal, and the first network gate connection of the p-type transistor network is connected to the first logic input.