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Approximation Schemes for Packing with Item Fragmentation

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Abstract

We consider two variants of the classical bin packing problem in which items may be fragmented. This can potentially reduce the total number of bins needed for packing the instance. However, since fragmentation incurs overhead, we attempt to avoid it as much as possible. In bin packing with size increasing fragmentation (BP-SIF), fragmenting an item increases the input size (due to a header/footer of fixed size that is added to each fragment). In bin packing with size preserving fragmentation (BP-SPF), there is a bound on the total number of fragmented items. These two variants of bin packing capture many practical scenarios, including message transmission in community TV networks, VLSI circuit design and preemptive scheduling on parallel machines with setup times/setup costs.

While both BP-SPF and BP-SIF do not belong to the class of problems that admit a polynomial time approximation scheme (PTAS), we show in this paper that both problems admit a dual PTAS and an asymptotic PTAS. We also develop for each of the problems a dual asymptotic fully polynomial time approximation scheme (AFPTAS). Our AFPTASs are based on a non-standard transformation of the mixed packing and covering linear program formulations of our problems into pure covering programs, which enables to efficiently solve these programs.

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Authors and Affiliations

  1. Computer Science Department, The Technion, Haifa, 32000, Israel

    Hadas Shachnai & Omer Yehezkely

  2. School of Computer Science, The Interdisciplinary Center, Herzliya, Israel

    Tami Tamir

Authors
  1. Hadas Shachnai
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  2. Tami Tamir
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  3. Omer Yehezkely
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Corresponding author

Correspondence to Hadas Shachnai.

Additional information

A preliminary version of this paper appears in proceedings of the 3rd Workshop on Approximation and Online Algorithms (WAOA’05).

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Shachnai, H., Tamir, T. & Yehezkely, O. Approximation Schemes for Packing with Item Fragmentation. Theory Comput Syst 43, 81–98 (2008). https://doi.org/10.1007/s00224-007-9082-x

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  • DOI: https://doi.org/10.1007/s00224-007-9082-x

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