Abstract
A flowshop scheduling problem with two batch-processing machines is investigated in this paper, with the optimization goal to minimize the makespan. When the job processing times on the two machines are positively correlated, a \(4\)-approximation algorithm for this NP-hard problem was previously proposed. We show that this algorithm has a worst-case performance guarantee of \(2\).

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Acknowledgments
Dong is supported by the Zhejiang Provincial Natural Science Foundation Grants No. LY13A010015 and the Science Foundation of Zhejiang Sci-Tech University (ZSTU) Grants No. 13062171-Y; Hu is supported by the National Natural Science Foundation of China Grants No. 11271324 and 11471286; Lin is supported by NSERC and the Science Foundation of Zhejiang Sci-Tech University (ZSTU) Grants No. 14062170-Y. Lin’s work was mostly done during his sabbatical leave at the ZSTU.
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Dong, J., Hu, J. & Lin, G. A note on the algorithm LPT-FF for a flowshop scheduling with two batch-processing machines. Optim Lett 10, 109–118 (2016). https://doi.org/10.1007/s11590-015-0859-6
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DOI: https://doi.org/10.1007/s11590-015-0859-6