3 Search Results for "Berry, Rodney"

Document
DOI: 10.4230/LIPIcs.IPEC.2025.11
Parameterized Algorithms for Diversity of Networks with Ecological Dependencies

Authors: Mark Jones and Jannik Schestag

Published in: LIPIcs, Volume 358, 20th International Symposium on Parameterized and Exact Computation (IPEC 2025)

Abstract
For a phylogenetic tree, the phylogenetic diversity of a set A of taxa is the total weight of edges on paths to A. Finding small sets of maximal diversity is crucial for conservation planning, as it indicates where limited resources can be invested most efficiently. In recent years, efficient algorithms have been developed to find sets of taxa that maximize phylogenetic diversity either in a phylogenetic network or in a phylogenetic tree subject to ecological constraints, such as a food web. However, these aspects have mostly been studied independently. Since both factors are biologically important, it seems natural to consider them together. In this paper, we introduce decision problems where, given a phylogenetic network, a food web, and integers k, and D, the task is to find a set of k taxa with phylogenetic diversity of at least D under the maximize all paths measure, while also satisfying viability conditions within the food web. Here, we consider different definitions of viability, which all demand that a "sufficient" number of prey species survive to support surviving predators. We investigate the parameterized complexity of these problems and present several fixed-parameter tractable (FPT) algorithms. Specifically, we provide a complete complexity dichotomy characterizing which combinations of parameters - out of the size constraint k, the acceptable diversity loss D̄, the scanwidth of the food web sw_ℱ, the maximum in-degree δ in the network, and the network height h - lead to W[1]-hardness and which admit FPT algorithms. Our primary methodological contribution is a novel algorithmic framework for solving phylogenetic diversity problems in networks where dependencies (such as those from a food web) impose an order, using a color coding approach.
Cite as

Mark Jones and Jannik Schestag. Parameterized Algorithms for Diversity of Networks with Ecological Dependencies. In 20th International Symposium on Parameterized and Exact Computation (IPEC 2025). Leibniz International Proceedings in Informatics (LIPIcs), Volume 358, pp. 11:1-11:21, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2025)

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@InProceedings{jones_et_al:LIPIcs.IPEC.2025.11,
  author =	{Jones, Mark and Schestag, Jannik},
  title =	{{Parameterized Algorithms for Diversity of Networks with Ecological Dependencies}},
  booktitle =	{20th International Symposium on Parameterized and Exact Computation (IPEC 2025)},
  pages =	{11:1--11:21},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-407-9},
  ISSN =	{1868-8969},
  year =	{2025},
  volume =	{358},
  editor =	{Agrawal, Akanksha and van Leeuwen, Erik Jan},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.IPEC.2025.11},
  URN =		{urn:nbn:de:0030-drops-251439},
  doi =		{10.4230/LIPIcs.IPEC.2025.11},
  annote =	{Keywords: Phylogenetic Diversity, Fixed-Parameter Tractability, Phylogenetic Networks, Food Webs, Color Coding}
}
Document
DOI: 10.4230/DagSemProc.09291.28
Stimulating creative flow through computational feedback

Authors: Daniel Jones, Oliver Bown, Jon McCormack, Francois Pachet, Michael Young, Rodney Berry, Iris Asaf, and Benjamin Porter

Published in: Dagstuhl Seminar Proceedings, Volume 9291, Computational Creativity: An Interdisciplinary Approach (2009)

Abstract
This report summarises the discussion and experimental work produced by the authors at the 2009 symposium Computational Creativity: An Interdisciplinary Approach, Dagstuhl Leibniz-Zentrum für Informatik. It outlines the motivation for using computational techniques to stimulate human creativity, briefly summarising its historical context and predecessors, and describes two software studies produced by the group as base-line exemplars of these ideas.
Cite as

Daniel Jones, Oliver Bown, Jon McCormack, Francois Pachet, Michael Young, Rodney Berry, Iris Asaf, and Benjamin Porter. Stimulating creative flow through computational feedback. In Computational Creativity: An Interdisciplinary Approach. Dagstuhl Seminar Proceedings, Volume 9291, pp. 1-10, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2009)

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@InProceedings{jones_et_al:DagSemProc.09291.28,
  author =	{Jones, Daniel and Bown, Oliver and McCormack, Jon and Pachet, Francois and Young, Michael and Berry, Rodney and Asaf, Iris and Porter, Benjamin},
  title =	{{Stimulating creative flow through computational feedback}},
  booktitle =	{Computational Creativity: An Interdisciplinary Approach},
  pages =	{1--10},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2009},
  volume =	{9291},
  editor =	{Margaret Boden and Mark D'Inverno and Jon McCormack},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09291.28},
  URN =		{urn:nbn:de:0030-drops-22232},
  doi =		{10.4230/DagSemProc.09291.28},
  annote =	{Keywords: Computational creativity}
}
Document
DOI: 10.4230/DagSemProc.09291.30
TANGIBLE REPRESENTATIONS AND MODES OF CREATIVE ENGAGEMENT

Authors: Rodney Berry

Published in: Dagstuhl Seminar Proceedings, Volume 9291, Computational Creativity: An Interdisciplinary Approach (2009)

Abstract
Tangible interfaces are finding their way into various areas of creative activity, particularly in the creation of music. Tangible representations of musical information, together with their graphical counterparts, play an important role in increasingly complex representational systems. This paper explores the relationships between these representations in the context of various modes of compositional (and by extension, creative) engagement adopted by composers in their working process.
Cite as

Rodney Berry. TANGIBLE REPRESENTATIONS AND MODES OF CREATIVE ENGAGEMENT. In Computational Creativity: An Interdisciplinary Approach. Dagstuhl Seminar Proceedings, Volume 9291, pp. 1-10, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2009)

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@InProceedings{berry:DagSemProc.09291.30,
  author =	{Berry, Rodney},
  title =	{{TANGIBLE REPRESENTATIONS AND MODES OF CREATIVE ENGAGEMENT}},
  booktitle =	{Computational Creativity: An Interdisciplinary Approach},
  pages =	{1--10},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2009},
  volume =	{9291},
  editor =	{Margaret Boden and Mark D'Inverno and Jon McCormack},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09291.30},
  URN =		{urn:nbn:de:0030-drops-22087},
  doi =		{10.4230/DagSemProc.09291.30},
  annote =	{Keywords: Computational creativity}
}
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