271 research outputs found

    An Execution Model for Fine-Grained Parallelism in Ada

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    20th International Conference on Reliable Software Technologies - Ada-Europe 2015 (Ada-Europe 2015), 25 to 29, Jun, 2015. Madrid, Spain. Best Paper Award.This paper extends the authors earlier proposal for providing Ada with support for fine-grained parallelism with an execution model based on the concept of abstract executors, detailing the progress guarantees that these executors must provide and how these can be assured even in the presence of potentially blocking operations. The paper also describes how this execution model can be applied to real-time systems

    Interfacing Ada to Operating Systems

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    Accuracy of Digital Breast Tomosynthesis for Depicting Breast Cancer Subgroups in a UK Retrospective Reading Study (TOMMY Trial)

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    Purpose To compare the diagnostic performance of two-dimensional (2D) mammography, 2D mammography plus digital breast tomosynthesis (DBT), and synthetic 2D mammography plus DBT in depicting malignant radiographic features. Materials and Methods In this multicenter, multireader, retrospective reading study (the TOMMY trial), after written informed consent was obtained, 8869 women (age range, 29–85 years; mean, 56 years) were recruited from July 2011 to March 2013 in an ethically approved study. From these women, a reading dataset of 7060 cases was randomly allocated for independent blinded review of (a) 2D mammography images, (b) 2D mammography plus DBT images, and (c) synthetic 2D mammography plus DBT images. Reviewers had no access to results of previous examinations. Overall sensitivities and specificities were calculated for younger women and those with dense breasts. Results Overall sensitivity was 87% for 2D mammography, 89% for 2D mammography plus DBT, and 88% for synthetic 2D mammography plus DBT. The addition of DBT was associated with a 34% increase in the odds of depicting cancer (odds ratio [OR] = 1.34, P = .06); however, this level did not achieve significance. For patients aged 50–59 years old, sensitivity was significantly higher (P = .01) for 2D mammography plus DBT than it was for 2D mammography. For those with breast density of 50% or more, sensitivity was 86% for 2D mammography compared with 93% for 2D mammography plus DBT (P = .03). Specificity was 57% for 2D mammography, 70% for 2D mammography plus DBT, and 72% for synthetic 2D mammography plusmDBT. Specificity was significantly higher than 2D mammography (P < .001in both cases) and was observed for all subgroups (P < .001 for all cases). Conclusion The addition of DBT increased the sensitivity of 2D mammography in patients with dense breasts and the specificity of 2D mammography for all subgroups. The use of synthetic 2D DBT demonstrated performance similar to that of standard 2D mammography with DBT. DBT is of potential benefit to screening programs, particularly in younger women with dense breasts. © RSNA, 2015The TOMMY Trial (a comparison of digital breast tomosynthesis with mammography in the UK Breast Screening Programme) was supported by the NIHR Health Technology Assessment Programme.This is the final published version of the article. It was originally published in Radiology (Gilbert et al., Radiology, 2015, doi:10.1148/radiol.2015142566). The final version is available at http://dx.doi.org/10.1148/radiol.201514256

    Mammographic density and breast cancer risk in breast screening assessment cases and women with a family history of breast cancer.

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    BACKGROUND: Mammographic density has been shown to be a strong independent predictor of breast cancer and a causative factor in reducing the sensitivity of mammography. There remain questions as to the use of mammographic density information in the context of screening and risk management, and of the association with cancer in populations known to be at increased risk of breast cancer. AIM: To assess the association of breast density with presence of cancer by measuring mammographic density visually as a percentage, and with two automated volumetric methods, Quantra™ and VolparaDensity™. METHODS: The TOMosynthesis with digital MammographY (TOMMY) study of digital breast tomosynthesis in the Breast Screening Programme of the National Health Service (NHS) of the United Kingdom (UK) included 6020 breast screening assessment cases (of whom 1158 had breast cancer) and 1040 screened women with a family history of breast cancer (of whom two had breast cancer). We assessed the association of each measure with breast cancer risk in these populations at enhanced risk, using logistic regression adjusted for age and total breast volume as a surrogate for body mass index (BMI). RESULTS: All density measures showed a positive association with presence of cancer and all declined with age. The strongest effect was seen with Volpara absolute density, with a significant 3% (95% CI 1-5%) increase in risk per 10 cm3 of dense tissue. The effect of Volpara volumetric density on risk was stronger for large and grade 3 tumours. CONCLUSIONS: Automated absolute breast density is a predictor of breast cancer risk in populations at enhanced risk due to either positive mammographic findings or family history. In the screening context, density could be a trigger for more intensive imaging

    Macrophage and Galleria mellonella infection models reflect the virulence of naturally occurring isolates of B. pseudomallei, B. thailandensis and B. oklahomensis

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    addresses: Biosciences, College of Life and Environmental Sciences, Geoffrey Pope Building, University of Exeter, Stocker Road, Exeter, Devon, EX4 4QD, UK.notes: PMCID: PMC3025829types: Journal Article; Research Support, Non-U.S. Gov't© 2011 Wand et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Burkholderia pseudomallei is the causative agent of melioidosis, a tropical disease of humans with a variable and often fatal outcome. In murine models of infection, different strains exhibit varying degrees of virulence. In contrast, two related species, B. thailandensis and B. oklahomensis, are highly attenuated in mice. Our aim was to determine whether virulence in mice is reflected in macrophage or wax moth larvae (Galleria mellonella) infection models

    Science in neo-Victorian poetry

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    This article considers the work of three contemporary poets and their engagement, in verse, with Victorian science. Beginning with the outlandish ‘theories’ of Mick Imlah’s ‘The Zoologist’s Bath’ (1983), it moves on to two works of biografiction – Anthony Thwaite’s poem ‘At Marychurch’ (1980), which outlines Philip Henry Gosse’s doomed attempts to unite evolution and Christianity, and Ruth Padel’s Darwin: A Life in Poems (2009). Starting off with John Glendening’s idea that science in neo-Victorian fiction, if fully embraced, provides an opportunity for self-revelation to characters, this article explores the rather less happy resolutions of each of these poems, while in addition discussing the ways in which these poems perform the formal changes and mutability discussed within them

    Plan de Mejora: intervención con estrategias activas para la comprensión lectora en los estudiantes de Décimo Año del Subnivel Superior

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    El presente proyecto de titulación “Plan de Mejora: intervención con estrategias activas para la comprensión lectora en los estudiantes de Décimo Año del Subnivel Superior de la escuela Luis Cordero de la ciudad de Cuenca”, tiene como objetivo mejorar el nivel de comprensión lectora y por ende el desarrollo de la destreza de escritura. Mediante el resultado del diagnóstico del pre test se procedió al diseño, aplicación y evaluación de diferentes estrategias activas en el Plan de Mejora institucional de la Unidad Educativa “Luis Cordero” de la ciudad de Cuenca. Adicionalmente, se aplicó dos encuestas, una dirigida a los estudiantes para verificar sus hábitos lectores y otra a los docentes, con el fin de conocer su perspectiva acerca del Plan de Mejora. Además, se empleó la entrevista a la docente de Lengua y Literatura con el objetivo de evidenciar el nivel de lectura que poseen los estudiantes. El análisis se basó en un enfoque cualitativo. Los resultados obtenidos del post test, han sido significativos, puesto que indican un logro de 1.14 puntos en una escala de 10. Además, las estrategias activas han permitido potenciar el nivel de comprensión lectora y han incrementado el interés de parte de los estudiantes hacia la lectura.The present project entitled "Improvement Plan: intervention with active strategies for reading comprehension in the tenth-year students of the Higher Sub-level from the Luis Cordero school in the city of Cuenca ", aims to improve the level of reading comprehension and therefore the development of writing skills. Through the result of the pre-test diagnosis, the design, application and evaluation of different active strategies in the Institutional Improvement Plan of the "Luis Cordero" Educational Unit of the city of Cuenca was processed. In addition, a survey was applied to the students to verify their reading habits and another to the teachers, in order to know their perspective on the Improvement Plan. In addition, the interview with the teacher of Language and Literature was used in order to demonstrate the level of reading that the students had. The analysis was based on a qualitative approach. The results obtained from the post-test have been significant, since they indicate an achievement of 1.14 points on a scale of 10. In addition, the active strategies have allowed to enhance the level of reading comprehension and have increased the interest on the part of the students towards the readingAzogue
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