Approximability and in-approximability results for no-wait shop scheduling

Approximability and in-approximability results for no-wait shop scheduling
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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:
Proceedings 41st Annual Symposium on Foundations of Computer Science
影响因子:
--
通讯作者:
G. Woeginger
G. Woeginger
中科院分区:
--
文献类型:
--
作者:
M. Sviridenko;G. Woeginger

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我们调查了MakePan标准下的No等商店调度问题的近似性。在流动厂,所有工作都以相同的订单穿过机器。在更一般的车间中,工作的路线取决于工作。我们为任何固定数量的机器上的NoThe Flow Shop问题提供了一个多项式时间近似方案(PTA)。除非p = np,否则该结果不能扩展到固定数量的机器上的车间问题:我们表明,无等待的作业店问题是APX-HARD(i)两台机器,两台机器,每份工作最多五个操作,在(ii)三台机器上,每个工作最多三个操作。
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.