<p>The scheduling measure of minimum weighted number of early jobs has hardly been investigated by scheduling researchers. This note focuses on a single machine scheduling and due-date assignment problem with the objective function of minimizing the weighted number of early jobs plus total weighted tardiness (given a common due-date for all jobs). The problem is proved to be NP-hard, and based on a number of properties of an optimal schedule, a pseudo-polynomial dynamic programming algorithm is introduced. Based on our numerical tests, the proposed algorithm is efficient and practical: medium size problems (of up to 150 jobs) are solved in very reasonable running times.</p>

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Single machine scheduling to minimize weighted number of early jobs plus total weighted tardiness

  • Matan Atsmony,
  • Gur Mosheiov

摘要

The scheduling measure of minimum weighted number of early jobs has hardly been investigated by scheduling researchers. This note focuses on a single machine scheduling and due-date assignment problem with the objective function of minimizing the weighted number of early jobs plus total weighted tardiness (given a common due-date for all jobs). The problem is proved to be NP-hard, and based on a number of properties of an optimal schedule, a pseudo-polynomial dynamic programming algorithm is introduced. Based on our numerical tests, the proposed algorithm is efficient and practical: medium size problems (of up to 150 jobs) are solved in very reasonable running times.