Machine scheduling with job rejection and DeJong's learning effect

<p style='text-indent:20px;'>This paper mainly discusses machine scheduling problems with job rejection and DeJong's learning effect. The goal is to determine the job sequence of the accepted jobs so as to minimize the scheduling cost of the accepted jobs plus the total rejection penalty of the rejected jobs. The scheduling costs of the accepted jobs are the makespan and the total completion time. For the single-machine setting, we show that both of the objectives can be optimally solved in polynomial time. For the parallel-machine setting, we show that minimizing the total completion time of the accepted jobs plus the total rejection penalty of the rejected jobs is still polynomially solvable, whereas the other problem is <inline-formula><tex-math id="M1">\begin{document}$ NP $\end{document}</tex-math></inline-formula>-hard, for which we provide a fully polynomial-time approximation scheme (FPTAS).</p>