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Search Results: 1 - 10 of 1209 matches for " Owen Burbank "
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Geometric Ergodicity & Scanning Strategies For Two-Component Gibbs Samplers
Alicia A. Johnson,Owen Burbank
Statistics , 2012,
Abstract: In any Markov chain Monte Carlo analysis, rapid convergence of the chain to its target probability distribution is of practical and theoretical importance. A chain that converges at a geometric rate is geometrically ergodic. In this paper, we explore geometric ergodicity for two-component Gibbs samplers which, under a chosen scanning strategy, evolve by combining one-at-a-time updates of the two components. We compare convergence behaviors between and within three such strategies: composition, random sequence scan, and random scan. Our main results are twofold. First, we establish that if the Gibbs sampler is geometrically ergodic under any one of these strategies, so too are the others. Further, we establish a simple and verifiable set of sufficient conditions for the geometric ergodicity of the Gibbs samplers. Our results are illustrated using two examples.
Social rituals and mental health: evaluation of the Social Rituals Interview Schedule
Janca Aleksandar,Owen John,Burbank Victoria,Ventouras Jane
Annals of General Psychiatry , 2006, DOI: 10.1186/1744-859x-5-s1-s119
Understanding Partnership Challenges in Teacher Recruitment Programs  [PDF]
Mary D. Burbank, Richard Diaz
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.326154
Abstract: This investigation examined perspectives on student eligibility and the curriculum for a teacher education seminar linked to a community-based collaborative. Project data identified: 1) perceptions on the qualifications of preservice teachers in a recruiting program for first-generation and ethnic minority teachers; and 2) viewpoints on the necessary curriculum for these preservice teacher participants. Our data indicate varied perspectives by project participants ranging from deficit to asset-based stances regarding prospective teachers from underrepresented communities. Our findings speak to the need for honest conversations within collaborative partnerships designed to diversify the teaching profession.
Breast interventional devices: how they evolve and define new subspecialities
F Burbank
Breast Cancer Research , 2006, DOI: 10.1186/bcr1416
Abstract: In the 1980s two events changed this static picture: the addition of tamoxifen to adjuvant and neoadjuvant chemotherapy, and the introduction of mammography. Beginning in 1990 annual breast cancer death rates in the United States began to fall, and have continued to fall each year since then. In 2001, the last year of published statistics, the breast cancer death rate was 26 deaths per 100,000. Best estimates for where to credit this dramatic drop in death rate place approximately 50% of the credit with improved adjuvant chemotherapy and 50% with mammography.Abnormal mammograms demand a breast biopsy since only one in five abnormal mammograms is actually a breast cancer. Consequently, widespread adoption of mammography has produced an image-guided breast biopsy industry in the United States. Open, surgical breast biopsy has been replaced with image-guided breast biopsy because improved breast biopsy tools have made image-guided breast biopsy equivalent in accuracy to open, surgical breast biopsy. These tools, in turn, have changed the professional lives of surgeons, pathologists, and mammographers, leading to the development of dedicated breast surgeons, breast pathologists, and interventional breast radiologists.
Depression-Biased Reverse Plasticity Rule Is Required for Stable Learning at Top-Down Connections
Kendra S. Burbank,Gabriel Kreiman
PLOS Computational Biology , 2012, DOI: 10.1371/journal.pcbi.1002393
Abstract: Top-down synapses are ubiquitous throughout neocortex and play a central role in cognition, yet little is known about their development and specificity. During sensory experience, lower neocortical areas are activated before higher ones, causing top-down synapses to experience a preponderance of post-synaptic activity preceding pre-synaptic activity. This timing pattern is the opposite of that experienced by bottom-up synapses, which suggests that different versions of spike-timing dependent synaptic plasticity (STDP) rules may be required at top-down synapses. We consider a two-layer neural network model and investigate which STDP rules can lead to a distribution of top-down synaptic weights that is stable, diverse and avoids strong loops. We introduce a temporally reversed rule (rSTDP) where top-down synapses are potentiated if post-synaptic activity precedes pre-synaptic activity. Combining analytical work and integrate-and-fire simulations, we show that only depression-biased rSTDP (and not classical STDP) produces stable and diverse top-down weights. The conclusions did not change upon addition of homeostatic mechanisms, multiplicative STDP rules or weak external input to the top neurons. Our prediction for rSTDP at top-down synapses, which are distally located, is supported by recent neurophysiological evidence showing the existence of temporally reversed STDP in synapses that are distal to the post-synaptic cell body.
Corporate Character Formation and CSR: The Function of Habit and Practice in the Mining Industry  [PDF]
John R. Owen, Deanna Kemp
American Journal of Industrial and Business Management (AJIBM) , 2014, DOI: 10.4236/ajibm.2014.45030

The mining industry provides a rich context through which to engage the practical and ethical limits of Corporate Social Responsibility (CSR). Recent debates in organizational ethics have drawn attention to institutional constraints which inhibit awareness raising and ethical practice within corporate settings. During the last decade, the mining industry has come under increasing pressure to improve its environmental, social and ethical performance. In an effort to respond to these more ethically-orientated external expectations, the mining industry has developed a range of internal regulatory mechanisms and process, which can be applied individually or in conjunction with other companies and organizations. This combination of internal and external drivers indicates a growing imperative for mining companies to ground CSR principles in their day-to-day operating practices. The challenge is to avoid organizational rules and procedures for CSR that lack depth and meaning and which fail to result in the wise and courageous use of personal agency. Instead mining companies must work to establish appropriate mechanisms that will see ethical norms adopted as organizational principles that guide, and result in, improved corporate conduct. Using the Aristotelean notion of “character formation”, the authors offer practical considerations for how this might occur in the mining industry.

Selection for prolificacy in the Cambridge sheep
JB Owen
Genetics Selection Evolution , 1982, DOI: 10.1186/1297-9686-14-4-579c
The development of a prolific breed of sheep
JB Owen
Genetics Selection Evolution , 1977, DOI: 10.1186/1297-9686-9-1-128b
Apendicitis aguda sin dolor o "El paraíso de los tontos": Caso clínico
Revista médica de Chile , 2008, DOI: 10.4067/S0034-98872008001200008
Abstract: the diagnosis of acute appendicitis has been based on the presence of ríght lower quadrant pain and guarding. occasionally, the pain disappears, even in the presence of a continuing appendicular process. this phenomenon is called "the fools' paradise". we report two male patients aged 19 and 17 years with an acute appendicitis confirmed by an abdominal ultrasound in one and an abdominal cat sean in the other, in whom the abdominal pain disappeared during the evolution. despite of the absence of pain, both were operated, based on imaging and laboratory studies, confirming the presence of an inflamed appendix.
The Internet and Healthcare in Somalia: Knowledge is Power
Owen Marriott
Global Media Journal : African Edition , 2011, DOI: 10.5789/2-1-39
Abstract: The introduction of the eight Millennium Development Goals (MDG’s) by the UN has highlighted the need to improve healthcare conditions across the globe. These goals are particularly pertinent in Somalia, one of the least developed countries in the world. This paper intends to look at the way the burgeoning telecommunications network in Somalia can benefit healthcare professionals by providing access to the internet which in turn provides access to information that can improve healthcare. The paper will argue that although the development of healthcare is commonly associated with the modernization paradigm, the internet can offer a more participatory approach to benefit healthcare professionals in Somalia.
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