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자료유형
학술저널
저자정보
Soondo Hong (Pusan National University) Youngjoo Kim (Korea Railroad Research Institute)
저널정보
대한산업공학회 Industrial Engineering & Management Systems Industrial Engineering & Management Systems Vol.17 No.4
발행연도
2018.12
수록면
745 - 756 (12page)
DOI
10.7232/iems.2018.17.4.745

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초록· 키워드

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Hand-off delays in bucket brigade order picking systems occur when downstream pickers have to wait to receive totes from upstream pickers. This paper introduces a method, termed a loosely coupled hand-off, to reduce waiting delays, and it conducts analytical and simulation studies to identify insights. The loosely coupled hand-off method, which is popular in industry, is preferred by pickers to reduce the expected hand-off delays of downstream pickers. We express the looseness of the hand-off synchronization, i.e., the threshold of the early release, as real number τ ≥ 0. To overcome the throughput reduction, we generalize the looseness from the perspective of a picker’s decision making and throughput improvement and extend the looseness parameter into a practical hand-off framework with measurements including the relative looseness of the hand-off (δ), the increment of work-in-process (WIP) (ω), and the work range of the loosely coupled hand-off (ψ) allowed. We find that the adjusted loosely coupled hand-off framework to balance the hand-off delay reduction and the throughput gains reduces hand-off delay by 30~88% and improves throughput by 2.7~6.4%. In general, to attain the overall system’s throughput improvement, the gains in the hand-off delay require the WIP level and the range adjustments.

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ABSTRACT
1. INTRODUCTION
2. BUCKET BRIGADE ORDER PICKING
3. PROBLEM DEFINITION
4. A LOOSELY COUPLED HAND-OFF FRAMEWORK AND SIMULATION STUDIES
5. CONCLUSIONS
REFERENCES

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