Predicting wind power ramp events directly based on the historical event time series has drawn increasing attention recently. But class imbalance problem of significantly affects prediction accuracy events. In present study, a layer oversampling (LOS) method is proposed considering relation characteristics amplitudes and occurrence frequency Meanwhile, hybrid sampling error bootstrap-LOS (EB-LO...

In this paper, we onsider goal-oriented adaptive nite element methods for Signorini's problem. The basis is a mixed formulation, whi h is reformulated as nonlinear variational equality using a nonlinear omplementarity (NCP) fun tion. For a general dis retization, we derive error identities with respe t to a possible nonlinear quantity of interest in the displa ement as well as the onta t for es...

Based on the generalized symmetry group method presented by Lou and Ma [Lou and Ma, Non-Lie symmetry groups of (2 + 1)-dimensional nonlinear systems obtained from a simple direct method, J. Phys. A: Math. Gen. 38 (2005) L129], firstly, both the Lie point groups and the full symmetry group of the nonisospectral BKP equation are obtained, at the same time, a relationship is constructed between th...