Boundedness 1 Brillouin 1 Direct source-to-drain tunneling 1 Drain current 1 Ensemble monte carlo 1 Intelligent systems 1 Monte Carlo methods 1 Monte Carlo simulators Multi-subband ensemble monte carlo 1 Potential barriers 1 Probability 1 Source-to-drain tunneling 1 Subbands 1 Tunneling probabilities 1 direct source-to-drain tunneling 1 multi-subband ensemble Monte Carlo 1 tunneling probability 1