Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 26 for “"selection mechanisms"”.
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Auditory frequency and location processing in an attention-switching paradigm: Evidence of distinct early selection mechanisms
… to address a number of questions concerning the mechanisms underlying auditory selective attention as well as the relationship of components of the Event-Related Potential (ERP) to these filtering processes. Specifically, Nataanen's ""attentional trace theory"" postulates that a common sensory …
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Diversity and Expertise in Representative Governance
… representative democracy look under different selection rules? In an attempt to reflect on foundational principles on which we could build a renewed case for representative democracy as democratic governance, this thesis explores democratic innovations for selecting representatives and focuses …
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Distributed Cognitive RAT Selection in 5G Heterogeneous Networks: A Machine Learning Approach
… poses serious challenges to the current cell selection mechanisms used in cellular networks. The max-SINR algorithm, although effective historically for performing the most essential networking function of wireless networks, is inefficient at best and obsolete at worst in 5G HetNets. The …
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Exploring Spatial Operations of Distractor Suppression in the Sense of Touch
… to facilitating goal-directed actions. Sensory selection mechanisms are prevalent in all sensory modalities, and can be implemented by enhancing information at the relevant location and/or suppressing neural information outside the focus of attention (a mechanism known as distractor …
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Examining the Impact of Examinee-Selected Constructed Response Items in the Context of a Hierarchical Rater Signal Detection Model
… Johnson, 2011) and a variety of examinee-item selection mechanisms were considered. These conditions varied from the hypothetical baseline condition--where examinees choose randomly and with equal frequency from a pair of item prompts--to the perhaps more realistic and certainly more …
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Deep Multi-Resolution Operator Networks (DMON): Exploring Novel Data-Driven Strategies for Chaotic Inverse Problems
… Performance of the DMON model and the proposed selection mechanisms are evaluated on two chaotic systems, a double pendulum and turbulent flow around a cylinder, with improvements observed under idealized scenarios whereby high and low-resolution inputs are manually paired, along with minor …
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Bio-Inspired Mechanism for Aircraft Assessment Under Upset Conditions
… test data. Based on immune negative and positive selection mechanisms, a heuristic selection of sub-selves and the formulation of a mapping- based algorithm capable of selectively capturing the dynamic fingerprint of upset conditions is implemented. The performance of the approach is assessed in …
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Effects of Particle Surface Properties on Feeding Selectivity in Suspension-Feeding Bivalve Molluscs
<p> <p>The mechanisms by which bivalve molluscs differentiate particles are not clearly understood, and the surface properties of a particle have been proposed as factors that contribute to particle selection. The effects of surface properties upon selection by suspension-feeding bivalves were …
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Essays on the evaluation of entrepreneurship programs
… on the performance of firms, regions, and the selection of early-stage projects in the economy. The first essay explores the impact of startup accelerators on early-stage entrepreneurial activity in their region by exploring the effects of accelerators on the availability and provision of seed …
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The use of prospect theory framework in constrained multi-objective particle swarm optimisation
… PSO still needs moreadaptation to the guide selection mechanisms in order to improve the search capacity ofthe particles and achieve better convergence. Moreover, PSO lacks an explicitmechanism to handleIn this work, new constrained PSO-based optimisation algorithms are proposed forsolving …
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Shedding Light on Biological and Ecological Function
… insects and animals, to potentially uncover mate selection mechanisms as well as aid in designing mimics for material design. Finally, the field of electronic spectroscopy was expanded through the proposal of a novel design for two-dimensional white-light spectroscopy studies. This new design …
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Evaluation, Interpretation, and Maintenance of Machine Learning Models for IT Operations
… cost and performance variation. We examine model selection mechanisms on historical models in maintaining AIOps solutions. Our findings highlight a potential research opportunities for model maintenance beyond the simple retraining and replacing strategies. This thesis helps practitioners manage …
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Spruce bark beetle disturbance in the forest-tundra ecotones of southwest Yukon: impacts and predisposing factors
… spruce mortality. The results indicate that host selection mechanisms and competitive restrictions in forest-tundra ecotones are similar to those in low-elevation, closed-canopy forests, but suggest that additional factors may increase susceptibility to attack in treeline environments. Insect …
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Mechanisms and consequences of hybridisation between Atlantic salmon (Salmo salar) and brown trout (Salmo trutta)
… investigate the way postcopulatory, prezygotic mechanisms act to isolate species at the level of the gamete. This thesis uses the naturallyhybridising, externally-fertilising system of Atlantic salmon, Salmo salar, and brown trout, S. trutta, to investigate mechanisms of hybridisation through …
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Microbial glycerolipids in the global ocean: environmental controls and sinking flux dynamics
… and sinking material possibly pointing to selection mechanisms at sinking material conception. I use glycerolipids to create a new source metric predicting the relative amounts of sinking material derived from fecal pellets verse aggregates. The findings of this thesis extend our …
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From brains to bears. understanding brain size evolution: causes, costs and benefits
… evidence is also found indicating sociality as a selection pressure driving brain size. In carnivores, evidence suggests ecological variables, most notably home range size, is influencing brain size, whereas no support is found for the social brain hypothesis. Life-history associations reveal …
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Towards More Accurate Causal Inference with Instrumental Variables and Mendelian Randomisation Analyses
… method using real data examples from UK Biobank. Selection bias is a common issue in statistical applications which biases IV analyses. Starting with linear IV models, we firstly show that adjusting for measured confounders can reduce but cannot eliminate selection bias, and then provide …
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The performance of coevolutionary topologies in developing competitive tree manipulation strategies for symbolic regression
… (MTM) strategies, as well as adequate selection mechanisms for search. Bugs utilize the MTM strategies in their chromosome to manipulate the input program (IP) with the aim of maximizing the error while tests adopt a set of their own MTM strategies to repair the damaged program using a …
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Stress adaptions of the resurrection fern Anemia caffrorum's microbiome and metabolism across seasons
… Furthermore, to identify potential signaling or selection mechanisms between A. caffrorum and its associated microorganisms, matching metabolomics was conducted. Additionally, this allowed for the characterization of the metabolic mechanisms of desiccation tolerance employed by A. caffrorum and …
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Stress adaptions of the resurrection fern Anemia caffrorum's microbiome and metabolism across seasons
… Furthermore, to identify potential signaling or selection mechanisms between A. caffrorum and its associated microorganisms, matching metabolomics was conducted. Additionally, this allowed for the characterization of the metabolic mechanisms of desiccation tolerance employed by A. caffrorum and …
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