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Combating Coevolutionary Disengagement by Reducing Parasite Virulence

John Cartlidge, Seth Bullock
2004 Evolutionary Computation  
Inspired by studies of natural host-parasite systems, we show that disengagement can be avoided by selecting for individuals that exhibit reduced levels of "virulence", rather than maximum ability to defeat  ...  While standard evolutionary algorithms employ a static, absolute fitness metric, coevolutionary algorithms assess individuals by their performance relative to populations of opponents that are themselves  ...  Reduced Parasite Virulence In this section we introduce a novel technique for combating disengagement, inspired by the effects of parasite virulence upon the dynamics of naturally occurring hostparasite  ... 
doi:10.1162/106365604773955148 pmid:15157374 fatcat:nf7i6vytxzbjlae6nznhcg3rae

Caring versus Sharing: How to Maintain Engagement and Diversity in Coevolving Populations [chapter]

John Cartlidge, Seth Bullock
2003 Lecture Notes in Computer Science  
We demonstrate that moderating parasite virulence differs signiÞcantly from resource sharing, and that its tendency to prevent disengagement can also reduce the likelihood of coevolutionary optimisation  ...  Here we explore the extent to which encouraging moderation in one coevolving population (termed parasites) can alleviate the problem of coevolutionary disengagement.  ...  In this paper we present a biologically inspired method for combating coevolutionary disengagement by moderating parasite virulence.  ... 
doi:10.1007/978-3-540-39432-7_32 fatcat:nzwam4coa5h5nidxfj7af2zpie

Substitution of the Fittest: A Novel Approach for Mitigating Disengagement in Coevolutionary Genetic Algorithms [article]

Hugo Alcaraz-Herrera, John Cartlidge
2021 arXiv   pre-print
We propose substitution of the fittest (SF), a novel technique designed to counteract the problem of disengagement in two-population competitive coevolutionary genetic algorithms.  ...  ACKNOWLEDGEMENTS Hugo Alcaraz-Herrera's PhD is supported by The Mexican Council of Science and Technology (Consejo Nacional de Ciencia y Tecnología -CONACyT). John Cartlidge is sponsored by Refinitiv.  ...  Inspired by the behaviour of biological host-parasite systems, where the virulence of pathogens evolves over time, reduced virulence is the first domain-independent technique with tunable parameters that  ... 
arXiv:2108.03156v1 fatcat:s5xtnzpoynharbexcgje4fpksq

Autonomous Virulence Adaptation Improves Coevolutionary Optimization

John Cartlidge, Djamel Ait-Boudaoud
2011 IEEE Transactions on Evolutionary Computation  
Previous work has demonstrated that setting an appropriate virulence, v, of populations accelerates coevolutionary optimization by avoiding detrimental periods of disengagement.  ...  Further experiments, in more complex domains of sorting networks and maze navigation, demonstrate AVA's efficiency over reduced virulence and the layered Pareto coevolutionary archive.  ...  Conclusion AVA, a novel technique designed to combat disengagement by adapting the virulence of coevolving populations during runtime, has been shown to automatically find target virulence values for the  ... 
doi:10.1109/tevc.2010.2073471 fatcat:2pi62jf7o5d7ba6mq3ns3bi4iq

The emergence of drug resistant HIV variants and novel anti–retroviral therapy

Koosha Paydary, Parisa Khaghani, Sahra Emamzadeh-Fard, Seyed Ahmad Seyed Alinaghi, Kazem Baesi
2013 Asian Pacific Journal of Tropical Biomedicine  
This article was supported by Tehran University of Medical Sciences (grant no. 55/10848).  ...  Meanwhile, HIV also altered its infective and virulence features by means of genomic shifts and modifications.  ...  Introduction In community ecology, the term "arms race" refers to coevolutionary processes observed in predatory or parasitic interactions in which the emergence of an adaptive feature in an organism results  ... 
doi:10.1016/s2221-1691(13)60106-9 pmid:23835806 pmcid:PMC3695575 fatcat:pfuauswhlbfjdaoj6wy7u3zbji


2006 Journal of Ornithology = Journal fur Ornithologie  
., followed by Chugoku on 14 Sept., Kanto on 19 Sept., Tohoku on 26 Sept. and finally in Hokkaido on 10 Oct.; duration was longest in Kansai and shortest in Hokkaido.  ...  , and virulence.  ...  There was no evidence of brood parasitism by females.  ... 
doi:10.1007/s10336-006-0093-1 fatcat:4rzbnoyibrbsrmtt5xzunqfzkq

The Coming age of scarcity: preventing mass death and genocide in the twenty-first century

1998 ChoiceReviews  
This would reduce the cost of food by 70 percent, especially by cutting its transport costs.  ...  Sweden enjoyed a combination of low population, untapped for est reserves, and markets for its products among the combatants.  ... 
doi:10.5860/choice.36-2413 fatcat:j7m2hottlzbujjignptvxtieda