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In this paper we use the commercial semiconductor device simulator, Sentaurus, to simulate the electrical characteristics of sub-30nm multiple-gate (MG) SOI MOSFETs. The gate configurations of the simulated MG SOI MOSFETs include: single-gate (SG), double-gate (DG), triple-gate (TG), and gate-all-around (GAA). We examine the effects of the dimensions of the gate length, fin height, fin width, and the transport models for each gate configuration. The simulation results indicate that as the gate length scales down to 15 nm below, only certain gate configurations with specific fin cross-section dimensions can meet the device requirements.