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81.
IPv4/IPv6的共存与过渡 总被引:1,自引:0,他引:1
Fred Baker 《中国教育网络》2009,(5):28-29
因特网正面临从传统1Pv4到IPv6的转变以及一段时期的共存。本文是一个技术人员结合IETF的工作对IP和IP网络的发展道路的看法。 相似文献
82.
R. E. Pimentel B. S. Baker K. Soliday R. F. Reiser II 《Journal of sports sciences》2013,31(19):2279-2285
ABSTRACTCyclists may be at greater risk of developing asymmetrical force and motion patterns than other ground-based athletes. However, functional asymmetries during cycling tend to be highly variable, making them difficult to assess. Dual-energy x-ray absorptiometry (DXA) measurements of areal bone mineral density (aBMD) and lean mass (LM) in the lower limbs may be a more sensitive and consistent method to identify asymmetries in cyclists. The goal of this study was to determine if competitive cyclists have greater levels of asymmetries in the lower body compared to non-cyclists using DXA. A secondary aim was to determine if aBMD and LM asymmetries change over the road cycling season. 17 competitive cyclists and 21 non-cyclist, healthy controls underwent DXA scans. Lower-body asymmetries were greater in cyclists compared to non-cyclists in aBMD and LM for all lower limb segments. However, these asymmetries did not tend to consistently favour a particular side, except for the pelvis having more LM on the dominant side. The were no longitudinal changes in aBMD or LM in the cyclists. Asymmetry analysis via DXA provides evidence that although functional asymmetries during cycling are variable, cyclists have increased lower body LM and aBMD asymmetries compared to non-cyclists. 相似文献
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Julia C. Phelan Kilchan Choi David Niemi Terry P. Vendlinski Eva L. Baker Joan Herman 《Assessment in Education: Principles, Policy & Practice》2012,19(2):211-230
This paper describes results from field testing of middle-school math formative assessments alongside professional development and instructional resources. We employed a randomised, controlled design to address the question: Does using our formative assessment strategies improve student performance on assessments of key mathematical ideas relative to a comparison group? This study also provided data on the instructional sensitivity of the assessments, which is part of the validation needed for formative assessments. Teachers were recruited from two districts and seven middle schools. Nineteen treatment and 17 comparison group teachers and their students were included in study analyses. Scores on extended response and short-answer questions indicated that students in the treatment group performed better than students in the comparison group who received the formative assessments alone. These findings demonstrate both the feasibility and value of including performance task-types in a brief assessment context. 相似文献
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Kelley Regan Anna Evmenova Pam Baker Marci Kinas Jerome Vicky Spencer Holly Lawson Terry Werner 《The Internet and Higher Education》2012,15(3):204-212
In an effort to expand existing research on the barriers of instructors experience in online learning environments (OLEs), a qualitative study was conducted at a large mid-Atlantic university. Six instructors teaching in different OLE formats (e.g., asynchronous, hybrid, and synchronous via videoconferencing) participated in two focus groups in order to explore their emotional experiences and ways to regulate the emotions when teaching in OLEs. The overarching themes included emotions of feeling (a) restricted, (b) stressed, (c) devalued, (d) validated, and (e) rejuvenated. The article also provides practical strategies on how participating instructors attempted to manage the challenging emotions. A consensus among all participants is that continuous dialog in a community of practice about strategies to enhance OLEs is imperative. 相似文献
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Laura H. Aversa Jennifer Lemmer Sarah Nunnink Robert N. McLay Dewleen G. Baker 《Child abuse & neglect》2014
Previous studies have found an association between childhood maltreatment (CM) and health-related quality of life (HRQoL), and to a lesser extent have considered whether psychiatric symptoms may explain the relationship. This study aimed to further our understanding of the link between CM and HRQoL by testing whether posttraumatic stress disorder (PTSD) or depressive symptoms mediate the relationship between childhood maltreatment and physical HRQoL. Mediation models were examined in a sample of male Operation Enduring Freedom (OEF) and Operation Iraqi Freedom (OIF) active duty and combat veterans (n = 249). PTSD and depressive symptoms mediated the relationship between CM and overall physical HRQoL, as well as participation in daily activities due to physical health, bodily pain, and social functioning. Mediation of the relationship between childhood maltreatment and physical and social functioning by depression and PTSD symptoms may lend support to neurobiological hypotheses that childhood maltreatment sensitizes the nervous system and after repeated trauma may lead to the development of psychiatric symptoms, which have a major impact on morbidity and mortality. 相似文献
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