Article ID: | iaor20082428 |
Country: | United Kingdom |
Volume: | 58 |
Issue: | 8 |
Start Page Number: | 1099 |
End Page Number: | 1102 |
Publication Date: | Aug 2007 |
Journal: | Journal of the Operational Research Society |
Authors: | Lin B.M.T. |
This note presents complexity results for a single-machine scheduling problem of minimizing the number of late jobs. In the studied problem, the processing times of the jobs are defined by positional learning effects. A recent paper proposed a polynomial time algorithm for the case with a common due date and conjectured the general problem to be NP-hard. We confirm that the general problem is strongly NP-hard and show that the studied problem remains NP-hard even if there are only two different due-date values.