Approximability and in-approximability results for no-wait shop scheduling
Approximability and in-approximability results for no-wait shop scheduling
复制标题
无等待车间调度的近似性和非近似性结果
DOI:
10.1109/sfcs.2000.892071
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发表时间:
2000
期刊:
影响因子:
--
通讯作者:
G. Woeginger
中科院分区:
文献类型:
--
作者:
M. Sviridenko;G. Woeginger
We investigate the approximability of no-wait shop scheduling problems under the makespan criterion. In a flow shop, all jobs pass through the machines in the same ordering. In the more general job shop, the routes of the jobs are job-dependent. We present a polynomial time approximation scheme (PTAS) for the no-wait flow shop problem on any fixed number of machines. Unless P=NP, this result cannot be extended to the job shop problem on a fixed number of machines: We show that the no-wait job shop problem is APX-hard on (i) two machines with at most five operations per job, and on (ii) three machines with at most three operations per job.