To test the effectiveness of the decomposed model we compared
its performance with the use of Xpress Optimizer to directly solve the
stochastic programming model with 10 scenarios.The results are
reported in Table1. The column “Opt” gives the optimal values,the
columns “Nodes” indicate the number of branch and bound nodes,
the columns “Seconds” report the running time in seconds to solve
the instance.For the decomposed model we report additionally the
number ofcuts added in the column “Ncuts” and the number of
iterations in the column “Iterations”, that is,the number of times we
solve the separation problem to add backlog and time constraints