Abstract
Given a set of n independent jobs with deterministic processing times and the same ready times, the problem is to find the optimal processing-time multiple k∗ for the TWK-power due-date assignment method, and the optimal job sequence σ∗ to minimize a total cost function. It is found that k∗ is a function of job sequence and σ∗ should be in SPT sequence. After the theoretical treatment, a numerical example is given for discussion.