We revisit the problem of estimating center symmetry θ an unknown symmetric density f. Although Stone (1975), Van Eeden (1970), and Sacks (1975) constructed adaptive estimators in this model, their depend on external tuning parameters. In effort to reduce burden parameters, we impose additional restriction log-concavity construct truncated one-step which are under assumption. Our simulations in...

This paper realizes the simultaneous optimization of a vessel’s course and speed for whole voyage within estimated time arrival (ETA), which can ensure is safe energy-saving through proper planning route speed. Firstly, dynamic sea area model with meteorological oceanographic data sets established to delineate navigable prohibited areas; secondly, some are extracted from records previous voyage...