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Search Results: 1 - 10 of 3484 matches for " Neil Davey "
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Clustering Predicts Memory Performance in Networks of Spiking and Non-Spiking Neurons
Weiliang Chen,Reinoud Maex,Volker Steuber,Neil Davey
Frontiers in Computational Neuroscience , 2011, DOI: 10.3389/fncom.2011.00014
Abstract: The problem we address in this paper is that of finding effective and parsimonious patterns of connectivity in sparse associative memories. This problem must be addressed in real neuronal systems, so that results in artificial systems could throw light on real systems. We show that there are efficient patterns of connectivity and that these patterns are effective in models with either spiking or non-spiking neurons. This suggests that there may be some underlying general principles governing good connectivity in such networks. We also show that the clustering of the network, measured by Clustering Coefficient, has a strong negative linear correlation to the performance of associative memory. This result is important since a purely static measure of network connectivity appears to determine an important dynamic property of the network.
Teaching a machine to see: unsupervised image segmentation and categorisation using growing neural gas and hierarchical clustering
Alex Hocking,James E. Geach,Neil Davey,Yi Sun
Physics , 2015,
Abstract: We present a novel unsupervised learning approach to automatically segment and label images in astronomical surveys. Automation of this procedure will be essential as next-generation surveys enter the petabyte scale: data volumes will exceed the capability of even large crowd-sourced analyses. We demonstrate how a growing neural gas (GNG) can be used to encode the feature space of imaging data. When coupled with a technique called hierarchical clustering, imaging data can be automatically segmented and labelled by organising nodes in the GNG. The key distinction of unsupervised learning is that these labels need not be known prior to training, rather they are determined by the algorithm itself. Importantly, after training a network can be be presented with images it has never 'seen' before and provide consistent categorisation of features. As a proof-of-concept we demonstrate application on data from the Hubble Space Telescope Frontier Fields: images of clusters of galaxies containing a mixture of galaxy types that would easily be recognised and classified by a human inspector. By training the algorithm using one field (Abell 2744) and applying the result to another (MACS0416.1-2403), we show how the algorithm can cleanly separate image features that a human would associate with early and late type galaxies. We suggest that the algorithm has potential as a tool in the automatic analysis and data mining of next-generation imaging and spectral surveys, and could also find application beyond astronomy.
Heterologous oligonucleotide microarrays for transcriptomics in a non-model species; a proof-of-concept study of drought stress in Musa
Mark W Davey, Neil S Graham, Bartel Vanholme, Rony Swennen, Sean T May, Johan Keulemans
BMC Genomics , 2009, DOI: 10.1186/1471-2164-10-436
Abstract: Following cross-hybridisation of Musa gDNA to the Rice GeneChip? Genome Array, ~33,700 gene-specific probe-sets had a sufficiently high degree of homology to be retained for transcriptomic analyses. In a proof-of-concept approach, pooled RNA representing a single biological replicate of control and drought stressed leaves of the Musa cultivar 'Cachaco' were hybridised to the Affymetrix Rice Genome Array. A total of 2,910 Musa gene homologues with a >2-fold difference in expression levels were subsequently identified. These drought-responsive transcripts included many functional classes associated with plant biotic and abiotic stress responses, as well as a range of regulatory genes known to be involved in coordinating abiotic stress responses. This latter group included members of the ERF, DREB, MYB, bZIP and bHLH transcription factor families. Fifty-two of these drought-sensitive Musa transcripts were homologous to genes underlying QTLs for drought and cold tolerance in rice, including in 2 instances QTLs associated with a single underlying gene. The list of drought-responsive transcripts also included genes identified in publicly-available comparative transcriptomics experiments.Our results demonstrate that despite the general paucity of nucleotide sequence data in Musa and only distant phylogenetic relations to rice, gDNA probe-based cross-hybridisation to the Rice GeneChip? is a highly promising strategy to study complex biological responses and illustrates the potential of such strategies for gene discovery in non-model species.Bananas and plantains are large herbaceous monocots from the genus Musa of the family Musaceae. The vast majority of cultivated bananas are hybrids derived from natural inter- and intraspecific crosses between two diploid wild species, Musa acuminata (designated by genome A) and M. balbisiana (designated by genome B) [1]. These diploid, triploid or tetraploid hybrids are of great economic importance in sub-Saharan Africa, South and Centr
A case of an ectopic cervical thymic cyst  [PDF]
Simon Davey, Janet McNally
Case Reports in Clinical Medicine (CRCM) , 2013, DOI: 10.4236/crcm.2013.22041

Ectopic cervical thymic cysts are uncommon lesions and definitive preoperative diagnosis is not always possible. Surgical excision is recommended due to the small but possible chance of malignant degeneration in adulthood. We present a case of a nine year old boy with an asymptomatic lesion in his neck, discuss the differential diagnoses of such lesions and treatment considerations.

Women Literacy and Infant Feeding Practices in Rural Integrated Child Development Scheme (ICDS) Block of Delhi
Davey Sanjeev , Davey Anuradha
National Journal of Community Medicine , 2012,
Abstract: Background: Infant feeding practices have significant effect on the child nutrition, which largely dependent upon the mothers correct knowledge and awareness for the same. Objective: To find out effect of rural women empowerment through literacy on infant feeding practices in an ICDS block. Material and Methodology: Interview of the mothers of registered children up to 6 years in the rural ICDS block for the feeding practices and recording of the weight of those registered children by the salter weighing scale for their nutritional status. Results: Three fourth of the children had received ceremonial feed in the form of honey or gutti and 40 percent of the mothers in our study has discarded colostrums, considering it as a€ bad milka€ . Exclusive breast feeding was received by 34.6% children. As literacy level of mothers increased the nutritional status of children was better. This could be because most of the women who are middle school passed or above are non working, so are able to give more time for care and feeding practices. The Severe malnutrition (grade III and IV) was evident only in illiterate category of mothers, where 58.7% women were working in unskilled or semiskilled job outside home. Conclusion: Women living in chronic hunger are forced to unskilled jobs for income generation for the family, thereby influencing the feeding practices of their children. In such scenario AWCs and AWWs can be a unique opportunity with their focused approach to take care of severe and moderate malnutrition.
Adolescents’ Compulsive Internet Use and Depression: A Longitudinal Study  [PDF]
Einar B. Thorsteinsson, Lucy Davey
Open Journal of Depression (OJD) , 2014, DOI: 10.4236/ojd.2014.31005
Abstract: Background: The present longitudinal study examined predictors of compulsive internet use and depression. Method: Adolescents, 21 males and 20 females, completed online questionnaires with a 12-month interval. Results: Social internet use (i.e., using instant messaging and social networks) was associated with decreased levels of depression. High support satisfaction, use of social networking, and instant messaging contributed to lower changes in compulsive Internet use. Conclusion: The effects of social internet use in combination with different psychosocial factors seem to have more positive effects than negative ones on change in depression and the development of compulsive internet use.

Surfactant Levels in Congenital Diaphragmatic Hernia
Marcus Davey
PLOS Medicine , 2007, DOI: 10.1371/journal.pmed.0040243
Reducing the risk of cardiovascular disease in older women
M Davey
South African Family Practice , 2007,
Abstract: Cardiovascular disease (CVD) is the leading cause of death in women older than 50 years. Risk factors for CVD differ in some aspects from those in men. The prevention of CVD in women has undergone a reappraisal with the publication of studies looking at the use of menopausal hormone therapy for both primary and secondary prevention. Although these studies concluded that there was no place for the use of hormone therapy for prevention of CVD, recent data suggests that the issue is still not resolved as regards the younger woman in early menopause. Until more data is available in this regard, the main focus of prevention should be on interventions to decrease risk factors for cardiovascular disease. South African Family Practice Vol. 49 (5) 2007: pp. 32-35
Toward An Effective Quality Assurance of Web-Based Learning: The perspective of Distance Learning Students
The Turkish Online Journal of Distance Education , 2003,
Consensus, Caring and Community: An Inquiry into Dialogue
Sarah Davey
Analytic Teaching and Philosophical Praxis , 2005,
Abstract: In a world of increasing change and instability, more responsibility is being placed on develop innovative practices, and on teacher educators and policy makers to develop innovative approaches to curriculum, pedagogy, and assessment. A growing number of theorists and practitioners are turning to inquiry-based learning, and in particular to philosophical inquiry, as a way to facilitate student-leanring in preparation for the challenges that students will encounter in the future.
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