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Journal of Scheduling

, Volume 18, Issue 3, pp 331–331 | Cite as

Erratum to: Flow shops with WIP and value added costs

  • Jaehwan Yang
  • Marc E. PosnerEmail author
Erratum

Erratum to: J Sched (2010) 13:3–16 DOI 10.1007/s10951-009-0130-z

We correct four errors in our paper. The first is that the equation
$$\begin{aligned} W_j = \sum \limits _{i=1}^m (w_{2i-1}Q_{2i-1,j}+w_{2i}p_{2i,j}) \end{aligned}$$
on Page 5 in Sect. 2 should read
$$\begin{aligned} W_j = \sum \limits _{i=1}^m (w_{2i-1}Q_{ij}+w_{2i}p_{ij}). \end{aligned}$$
The next error concerns Lemma 2. As stated, it is incorrect. Hatem Hadda noticed that the lemma holds when there are only two machines. We observe that it also holds for the \(m\)-machine case by changing the statement slightly to:

Lemma 2

For the problem \(F||\sum W_j\), suppose that \(p_{ij} \ge p_{i+1,j}\) for all \(i \in M \setminus \{m\}\) and \(j \in N\). Also, suppose that \(\sum \nolimits _{i=1}^{k} p_{ij} \le \sum \nolimits _{i=1}^{k} p_{i,j+1}\) for all \(k \in M\) and \(j \in N \setminus \{n\}\). Then, scheduling the jobs without inserted idle time in the order \((1, 2,\ldots ,n)\) is optimal.

The final errors are in the statement of Lemma 3, which contains two typos. The first is that \([j]\) should mean the job in position \(j\) on Machine \(l\) (not Machine \(m\)). The second is that the first term after the inequality
$$\begin{aligned} w_1 n \sum \limits _{i=1}^{l-1} p_{i[l]} \end{aligned}$$
should be
$$\begin{aligned} w_1 n \sum \limits _{i=1}^{l-1} p_{i[1]}. \end{aligned}$$

Notes

Acknowledgments

We thank Hatem Hadda for noticing the errors in our paper.

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.School of Business AdministrationUniversity of SeoulSeoulKorea
  2. 2.Department of Integrated Systems EngineeringThe Ohio State UniversityColumbusUSA

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