Optimal Operation of High-Speed Trains Using Hybrid Model Predictive Control

Table 4

Definition of some notations.

Notation	Definition
	The MILP problem
	The minimum upper bound of optimal performance of train operation
	The optimal solution vector of optimal performance index for train operation
	The object table of recording all LP subproblems that need to be solved
	The optimal performance of the current relaxed LP problem
	The optimal solution vector of the relaxed LP subproblem
	Number of LP subproblems that have been solved
	The maximum number of LP problems