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An investigation of artificially-evolved robust and efficient connectionist swimming controllers for a simulated lampreyOr, Jimmy (Hajime) January 2002 (has links)
This dissertation investigates the evolutionary design of robust and efficient connectionist swimming controllers for a simulated lamprey. Using the neuromechanical lamprey model proposed by Ekeberg [1993] and extending the work of Ijspeert [1998] on evolving lamprey swimming CPGs using genetic algorithms, I investigate the space of possible neural configurations which satisfies the following three properties: 1) Robustness against variation in body parameters, 2) Swimming efficiency, and 3) Robustness against random variation in neural connections. These properties were chosen because they are important to both the real lamprey and its robotic implementation. After a review of the relevant literatures on lamprey neurophysiology and a detailed account of Ekeberg’s and Ijspeert’s works, I describe my reimplementation of their model. Using that model, I study the effect of variation of body scale in the performance of Ekeberg’s and Ijspeert’s controllers. The controllers interact with the mechanical model in different ways to achieve high speed swimming at various scales. To investigate this phenomenon I characterise the behaviour of the body when driven by a sinusoidal-based analytic controller. The resulting performance data reveals that the mechanical model has two or three characteristic resonances which the swimming controllers exploit. The second section of the dissertation further explores the issue of robustness with respect to variation in body scale by rewarding controllers which maintain good performance across a range of scales in the fitness function used to evolve CPGs. A number of controllers are produced by the genetic algorithm and analysed, but the effectiveness of this approach is disappointing.
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Physiological and anatomical studies of neurosecretion in lymnaeaSoffe, S. R. January 1979 (has links)
No description available.
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Neural coding of Tactile Stimuli in the Rat Whisker SystemBale, Michael R. January 2009 (has links)
No description available.
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Feeding habits of the Acrididae (Orthopt.) and factors which determine themWilliams, Leonard Herbert January 1953 (has links)
No description available.
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Some aspects of carbohydrate metabolism in Schistocerca gregaria ForskGilroy, Margaret Mary January 1975 (has links)
No description available.
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Physiologically active factors in the corpora cardiaca of insectsJones, Jennifer January 1978 (has links)
No description available.
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Some factors affecting the secretion of digestive enzymes in various insectsDadd, Reginald Hugh January 1954 (has links)
No description available.
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Electrophysiological, biochemical, and anatomical studies of the vertebrate (fish) retinaDjamgoz, Mustafa Bilgin Ali January 1978 (has links)
No description available.
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Techniques for the evaluation of humidity and lightEasty, Antony Charles January 1977 (has links)
No description available.
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The Avian Eggshell: A Mediating BoundaryTullett, S. G. January 1976 (has links)
No description available.
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