ship motions and drift force model to obtain the corresponding second-order system 

 response. From such a model various statistics of the system responses can be 

 calculated, as discussed in several of the references to the presentation. Develop- 

 ment of this approach would be a very ambitious project, but could yield an accurate, 

 efficient model taking into account the most important nonlinear effects, and should 

 be considered. 



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