A Note on the Parameterized Complexity of Unordered Maximum Tree Orientation. Böcker, S. & Damaschke, P. Discrete Appl Math, 160(10-11):1634–1638, 2012.
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In the Unordered Maximum Tree Orientation problem, a set P of paths in a tree and a parameter k is given, and we want to orient the edges in the tree such that all but at most k paths in P become directed paths. This is a more difficult variant of a well-studied problem in computational biology where the directions of paths in P are already given. We show that the parameterized complexity of the unordered version is between Edge Bipartization and Vertex Bipartization, and we give a characterization of orientable path sets in trees by forbidden substructures, which are cycles of a certain kind.
@Article{boecker12note,
  author    = {Sebastian B\"ocker and Peter Damaschke},
  title     = {A Note on the Parameterized Complexity of Unordered Maximum Tree Orientation},
  journal   = {Discrete Appl Math},
  year      = {2012},
  volume    = {160},
  number    = {10-11},
  pages     = {1634--1638},
  abstract  = {In the Unordered Maximum Tree Orientation problem, a set P of paths in a tree and a parameter k is given, and we want to orient the edges in the tree such that all but at most k paths in P become directed paths. This is a more difficult variant of a well-studied problem in computational biology where the directions of paths in P are already given. We show that the parameterized complexity of the unordered version is between Edge Bipartization and Vertex Bipartization, and we give a characterization of orientable path sets in trees by forbidden substructures, which are cycles of a certain kind.},
  doi       = {10.1016/j.dam.2012.02.017},
  file      = {BoeckerDamaschke_NoteParameterizedComplexity_DAM_2012_preprint.pdf:2012/BoeckerDamaschke_NoteParameterizedComplexity_DAM_2012_preprint.pdf:PDF},
  keywords  = {jena; linkpdf; tree orientation; fpt; PABI},
  owner     = {Sebastian},
  timestamp = {2011.11.18},
}

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