“…While it is true that the parasitic bipolar is not significant for modeling normal device operation, it becomes a major factor in modeling single-event effects as "ill be discussed in the following subsections. In addition, even for modeling normal operating conditions, the models appear complex both numerically [46][47][48] and computationally [49][50][51][52][53] or are limited in device structures or range of operating conditions [54][55][56][57]. More recent characterization and modeling efforts have concentrated on the optimization of device designs and the effects of scaling the SOI devices to smaller device sizes and thinner active layers [58][59][60][61], but again the concentration is on normal device operation or post irradiation operation (for example, increases in leakage currents and shifts in threshold voltages [43,60] CMOS-SOI devices are distinguished from bulk MOS devices by a decreased charge collection volume reducing the direct perturbation of the device during the penetration of an ion (single event).…”