In large-scale disasters, such as earthquakes and tsunamis, quick sufficient transportation of emergency relief supplies is required. Logistics activities conducted to quickly provide appropriate aid (relief goods) people affected by disasters are known humanitarian logistics (HL), play an important role in terms saving the lives those affected. previous last-mile distribution HL, transported t...

  Bi-level programming, a tool for modeling decentralized decisions, consists of the objective(s) of the leader at its first level and that is of the follower at the second level. Three level programming results when second level is itself a bi-level programming. By extending this idea it is possible to define multi-level programs with any number of levels. Supply chain planning problems are co...

We model and analyze an elevator system during up-peak. We study the round-trip time, whose distribution depends strongly on the number of passengers waiting at the lobby, as well as the number of stops and the highest reversal floor. The distribution functions of the passenger queue length in the lobby, the round-trip time, the waiting time, the ride time and the journey time are derived.