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Electrocardiographic interference and conductance volume measurements

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Journal of Biomedical Science and Engineering 2009年第7期2卷 491-498页

作者： Simon P. McGuirk Dan Ewert david J. barron John H. Coote 不详

The conductance catheter technique enables continuous ventricular volume measurements based on the electrical conductance of blood within the ventricular cavity. However, ventricular excitation also produces a measurable electrical signal within the ventricular cavity. This study was undertaken to investigate the relationship between the ventricular electrogram and conductance volume measurements in a physical model of the left ventricle without parallel conductance. The ventricular electrogram was simulated with an ECG signal, ECGinput connected to two ring electrodes within the model ventricle. Conductance volume measurements were made with and without ECGinput. The difference between these measurements, GECG(t), represented the conductance volume due to ECGinput. GECG(t) varied as a function of the first-derivative of ECGinput with respect to time (r2=0.92, P<0.001). GECG(t), This primarily affected volume measurements during ventricular depolarisation;during this phase the volume measurement error varied widely between –12% and +9%. As a re-sult, end-diastole could not be reliably identified on the pressure-volume loop. The accuracy of conduc-tance volume measurements during late diastole and early isovolumic contraction are substantially affected by the ventricular electrogram. This may result in a significant error in end-diastolic volume estimates, which has important implications for the quantitative assessment of ventricular function including, in particular, the assessment of chamber compliance.

关键词： Volume Measurement Conductance Catheter Electrocardiogram Ventricular Electrogram

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两种文化:计算机科学和个人计算机

世界科学 1990年第10期 38-40页

作者： david barron 章越

许多专注于学术的计算机科学家大多都忽视了近年来个人计算机的一些激动人心的进展和许多面向这些进展的创新性的软件。这篇文章介绍了这些进展,并且还考虑了诸如为什么这些个人计算机方面的进展得不到学术上应有重视等问题。这也许会... 详细信息

许多专注于学术的计算机科学家大多都忽视了近年来个人计算机的一些激动人心的进展和许多面向这些进展的创新性的软件。这篇文章介绍了这些进展,并且还考虑了诸如为什么这些个人计算机方面的进展得不到学术上应有重视等问题。这也许会引出一些有关的意想不到的结论和具有学术性的计算机科学所扮演的角色。虽然此文是从英国这一角度来写的,但关于这一现象的依据并不只局限于这个国家。

关键词：计算机科学学术性个人计算机软件 PC机两种文化

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社会变革与大学发展(英文)

社会变革与大学发展(英文)

A New Phasor Estimator for PMU Applications:P Class and M Class

北京论坛（2007）文明的和谐与共同繁荣——人类文明的多元发展模式

作者： Luis david Guzman barron Pontificia Universidad Catolica Del Perú

"The harmony of Civilizations and Prosperity for all",is an ambitious program,which proposes various *** text pretends to point out the convenience of connecting,in this effort, modernism and tradition and to mention ...

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Journal of Modern Power Systems and Clean Energy 2020年第1期8卷 55-66页

作者： Jose R.Razo-Hernandez Arturo Mejia-barron david Granados-Lieberman Martin Valtierra-Rodriguez Jose F.Gomez-Aguilar ENAP-Research Group Facultad de IngenieríaUniversidad Autónoma de Querétaro(UAQ)San CayetanoC.P.76807México ENAP-Research Group Departamento de Ingeniería ElectromecánicaInstituto Tecnológico Superior de Irapuato(ITESI)Colonia El CopalC.P.36821México CONACyT-Centro Nacional de Investigación y Desarrollo Tecnológico(CENIDET) Tecnológico Nacional de MéxicoInterior Internado Palmira S/NCol.PalmiraC.P.62490México

Phasor measurement units(PMUs)are fundamental tools in the applications of modern power systems,where synchronized phasor estimations are *** accuracy and dynamic performance requirements for phasor,frequency,and rate of change of frequency(ROCOF)estimations are established in the IEEE Std.C37.118.1-2011 along with the IEEE Std.C37.118.1 a-2014,where two PMU performances are suggested:P class filters for applications requiring fast response and M class filters for applications requiring high rejection to aliased *** this paper,a methodology to design new phasor estimators that satisfy the P class and M class requirements in PMUs is *** proposed methodology is based on finite impulse response filters,brick-wall filters,and complex filter design concepts,where frequency range,time performance,harmonic rejection and out-of-band interference requirements are considered in its design.A comparative analysis using the reference model given by the IEEE Std.C37.118.1 is *** results show the effectiveness of the phasor estimators under steady-state and dynamic conditions according to the PMU standard,making them suitable tools for applications in power systems.

关键词： Brick-wall filter complex filter IEEE Std.C37.118.1 M class P class phasor measurement unit(PMU) phasor estimator

Multiple myeloma survival in New South Wales, Australia, by treatment era to 2020

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Cancer Biology & Medicine 2024年第8期21卷 703-711页

作者： Eleonora Feletto Qingwei Luo Anna Kelly Marianne Weber david Goldsbury Katherine barron Karen Canfell Xue Qin Yu The Daffodil Centre The University of SydneyA Joint Venture with Cancer Council NSWSydney NSW 2006Australia

Objective: Australia has relatively high multiple myeloma(MM) incidence and mortality rates. Advancements in MM treatment over recent decades have driven improvements in MM survival in high-income countries;however, reporting in Australia is limited. We investigated temporal trends in population-wide MM survival across 3 periods of treatment advancements in New South Wales(NSW), ***: Individuals with an MM diagnosis in the NSW Cancer Registry between 1985 and 2015 with vital follow-up to 2020, were categorized into 3 previously defined treatment eras according to their diagnosis date(1985±1995, chemotherapy only;1996±2007, autologous stem cell transplantation;and 2008±2015, novel agents including proteasome inhibitors and immunomodulatory drugs). Both relative survival and cause-specific survival according to Fine and Gray's competing risks cumulative incidence function were calculated by treatment era and age at ***: Overall, 11,591 individuals were included in the study, with a median age of 70 years at diagnosis. Five-year relative survival improved over the 36-year(1985±2020) study period(31.0% in 1985±1995;41.9% in 1996±2007;and 56.1% in 2008±2015). For individuals diagnosed before 70 years of age, the 5-year relative survival nearly doubled, from 36.5% in 1985±1995 to 68.5% in 2008±2015. Improvements for those > 70 years of age were less pronounced between 1985±1995 and 1996±2007;however, significant improvements were observed for those diagnosed in 2008±2015. Similar overall and age-specific patterns were observed for causespecific survival. After adjustment for gender and age at diagnosis, treatment era was strongly associated with both relative and cause-specific survival(P < 0.0001).Conclusions: Survival of individuals with MM is improving in Australia with treatment advances. However, older age groups continue to experience poor survival outcomes with only modest improvements over time. Given the increasing prevalence of MM in

关键词： Multiple myeloma cancer epidemiology survival analysis competing risk analysis Australia

Designing healthy communities： A walkability analysis of LEED-ND

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Frontiers of Architectural Research 2016年第4期5卷 433-452页

作者： Adriana A. Zuniga-Teran barron J. Orr Randy H. Gimblett Nader V. Chalfoun Scott B. Going david P. Guertin Stuart E. Marsh Udall Center for Studies in Public Policy University of Arizona Tucson AZ 85719 USA

Prevailing city design in many countries has created sedentary societies that depend on automobile use. Consequently, architects, urban designers, and land planners have developed new urban design theories, which have been incorporated into the Leadership in Energy and Environmental Design for Neighborhood Development （LEED-ND） certification system. The LEED- ND includes design elements that improve human well-being by facilitating walking and biking, a concept known as walkability. Despite these positive developments, relevant research findings from other fields of study have not been fully integrated into the LEED-ND. According to Zuniga-Teran （2015）, relevant walkability research findings from multiple disciplines were organized into a walkability framework （WF） that organizes design elements related to physical activity into nine categories, namely, connectivity, land use, density, traffic safety, surveil- lance, parking, experience, greenspace, and community. In this study, we analyze walkability in the LEED-ND through the lens of the nine WF categories. Through quantitative and qualitative analyses, we identify gaps and strengths in the LEED-ND and propose potential enhancements to this certification system that reflects what is known about enhancing walkability more comprehensively through neighborhood design analysis. This work seeks to facilitate the translation of research into practice, which can ultimately lead to more active and healthier societies.

关键词： Watkabitity LEED-ND Physical activity Urban design Well-being Built environment

Designing healthy communities： Testing the walkability model

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Frontiers of Architectural Research 2017年第1期6卷 63-73页

作者： Adriana A. Zuniga-Teran barron J. Orr Randy H. Gimblett Nader V. Chalfoun Stuart E. Marsh david P. Guertin Scott B. Going Udall Center for Studies in Public Policy University of Arizona Tucson AZ 85719 USA

Research from multiple domains has provided insights into how neighborhood design can be improved to have a more favorable effect on physical activity, a concept known as walkability. The relevant research findings/hypotheses have been integrated into a Walkability Framework, which organizes the design elements into nine walkability categories. The purpose of this study was to test whether this conceptual framework can be used as a model to measure the interactions between the built environment and physical activity. We explored correlations between the walkability categories and physical activity reported through a survey of residents of Tucson, Arizona （n=486）. The results include significant correlations between the walkability categories and physical activity as well as between the walkabi[ity categories and the two motivations for walking （recreation and transportation）. To our knowledge, this is the first study that reports links between wa[kability and walking for recreation. Additionally, the use of the Walkability Framework allowed us to identify the walkability categories most strongly correlated with the two motivations for walking. The results of this study support the use of the Walkability Framework as a model to measure the built environment in relation to its ability to promote physical activity.

关键词： Watkability Physical activity Buitt environment LEED-ND Neighborhood design

改进高校IT服务支持混合工作模式——EDUCAUSE 2023年度十大IT议题(五)

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中国教育网络 2023年第4期 42-44页

作者： Brian Basgen Adrian Ellison Curt Hillegas Pekka Kahkipuro Leah Kraus John Stroud david Ayersman barron Koralesky Emma Woodcock 杨望(译) 不详东南大学

EDUCAUSE日前发布了《2023年度十大IT议题:基础模型》报告,描述了高校未来将如何发展的基础模型(FoundationModels),这些模型由领导力、数据、工作和学习三个主题构建而成。与人工智能的基础模型一样,高等教育的基础模型会带来巨大好处... 详细信息

EDUCAUSE日前发布了《2023年度十大IT议题:基础模型》报告,描述了高校未来将如何发展的基础模型(FoundationModels),这些模型由领导力、数据、工作和学习三个主题构建而成。与人工智能的基础模型一样,高等教育的基础模型会带来巨大好处,可能代表着学校前进的最佳路线。本刊将逐期刊载该报告。

关键词：人工智能 EDUCAUSE IT服务最佳路线基础模型高等教育领导力主题构建

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有效教学的策略(上)

数字教育 2021年第1期7卷 85-92页

作者：琳达·达令·哈蒙德丽莎·弗卢克香纳·库克·哈维布里基·巴伦大卫·奥舍() 骆奇盛群力(译) 学习政策研究所华盛顿特区20036 斯坦福大学加利福尼亚帕罗奥图94305 美国研究院华盛顿特区20007 浙江大学教育学院浙江杭州310028

在创设支持性学习环境之后,怎样的课程设计、教学方法和评估实践能让学生深入理解学科内容,培养解决复杂问题和有效沟通的能力,从而最终学会管理学习活动呢?本文依据最新的研究综述概述了学习与发展科学所达成的一些新的共识,它们对学... 详细信息

在创设支持性学习环境之后,怎样的课程设计、教学方法和评估实践能让学生深入理解学科内容,培养解决复杂问题和有效沟通的能力,从而最终学会管理学习活动呢?本文依据最新的研究综述概述了学习与发展科学所达成的一些新的共识,它们对学校和课堂实践富有启示。这些策略主要包括建立和扩大儿童的知识和经验,支持概念上的理解、参与和动机,发展元认知、主体精神和策略性学习的能力等。

关键词：学习科学教学设计教学策略有效教学