  DNA translocation through nanopores is one of the most promising strategies
for the next-generation sequencing technologies. Most part of experimental and
numerical works has focused on polymer translocation biased by electrophoresis,
where a pulling force acts on the polymer within the nanopore. An alternative
strategy however is emerging, which uses optical or magnetic tweezers. In this
case, the pulling force is exerted directly at one end of the polymer, which
strongly modifies the translocation process. In this paper, we report numerical
simulations of both linear and structured (mimicking DNA) polymer models,
simple enough to allow for a statistical treatment of the pore structure
effects on the translocation time probability distributions. Based on extremely
extended computer simulation data, we : i) propose scaling arguments for an
extension of the predicted translocation times $\tau \sim N^{2}F^{-1}$ over the
moderate forces range; ii) analyze the effect of pore size and polymer
structuration on translocation times $\tau$.
