基于网页摘要分析的元搜索引擎研究*

针对目前搜索引擎返回结果的海量性，构建一个元搜索引擎，旨在高效利用多个成员搜索引擎返回的结果。介绍元搜索引擎的基本架构及当前结果融合的主要方法，应用统计学方法研究网页标题、网页摘要与网页文本之间的相关性关系，从而确定相关度权值进行结果相关性判断。实验证明，元搜索引擎搜索结果的平均准确率比各个成员引擎的搜索结果平均准确率都有较大提高。     

Strength in Numbers: Encouraging Every Staff Member to Work to Capacity

Libraries play a critical role in enhancing the learning landscape of the schools they support. In order for any library to become a powerhouse and a community meeting place, all library team members need to align with the library's vision, own it and begin to add their own strengths and talents purposefully. This article explores practical strategies for developing a visionary team, including supportive leadership, daily stand-up meetings, weekly staff meetings, special-focus teams, rostering and the “five conversations” approach. These effective strategies can be implemented across a broad range of library workforce contexts in order to ensure the most effective workforce teams are built.     

多卷书取卷册号的体会

<正> 在分编图书时常会遇到多卷册图书,在编制索书号时,一定要将卷册号编入,以全面反映书名的内容范围,并使每种图书各自都具有不同的号码,以便于排分类目录和排架,因此在编制目录时,一定要重视卷册号,不能视为可有可无的东西。但在实际编目过程中,取卷册号时遇到的问题也是多种多样的,有的图书有明显的“卷”“册”“辑”“上、中、下”“第…卷”“第…册”“××年××期”等次第词或量词以表示多卷书的卷册,这种情况好处理,只需将该书的卷册或年期的次第数直接编入索书号即可。如《内科学》上、《红楼梦》下、《近代史资料》81年1期,总46号、《科学技术成果     

客户价值评价体系在商业银行信息化中的应用分析

从客户价值的定义入手,提出银行客户价值评价的指标体系,并就构建客户价值体系的数据模型及其在银行信息化中的应用进行具体分析。     

专业必修课弹性与创造性成长空间——以国内外五所高校计算机相关专业为例

培养方案弹性对于培养拔尖创新人才具有重要意义,但弹性却在国内高校培养方案必修课部分缺席.以文本分析和质性研究方法对国内外一流高校计算机相关专业培养方案进行比较、以半结构式访谈深入了解课程设置对学生学习的影响研究发现,麻省理工学院和卡内基?梅隆大学计算机科学专业培养方案的专业必修课弹性显著高于国内顶尖高校.研究提出,必修...     

统计图形数据库参数设计方法

本文通过具体的实例,利用 2.13Ⅰ的特显命令,在dBASEⅢ PLUS下设计了一个图形数据库,为实现统计图形参数设计提供一方法。     

Why some teachers easily learn to use a new virtual learning environment: a technology acceptance perspective

After a decade of virtual learning environments (VLEs) in higher education, many teachers still use only a minimum of its affordances. This study looked at how academic staff interacted with a new and unknown VLE in order to understand how technology acceptance and support materials influence (perceived and actual) task performance. In an experimental design, 36 participants were split into a control (online help) and experimental (instructor video) condition and completed five common teaching tasks in a new VLE. In contrast to most technology acceptance model research, this study found that perceived usefulness of the VLE was not related to (perceived) task performance. Perceived ease of use was related to intentions and actual behaviour in the VLE. Furthermore, no significant difference was found between the two conditions, although the experimental condition led to a (marginal) increase in time to complete the tasks.     

Reversing the Downward Spiral of Science Instruction in K-2 Classrooms

This study investigated the extent to which teacher professional development led to changes in science instruction in K-2 classrooms in rural school districts. The research specifically examined changes in (a) teachers’ content knowledge in science; (b) teachers’ self-efficacy related to teaching science; (c) classroom instructional time allotted to science; and (d) instructional strategies used in science. The study also investigated contextual factors contributing to or hindering changes in science instruction. Data sources included a teacher survey, a self-efficacy assessment, content knowledge tests, interviews, and classroom observations. After one year in the program, teachers showed increased content knowledge and self-efficacy in teaching science; they spent more instructional time on science and began using different instructional strategies. Key contextual factors included curricular demands, resources, administrative support, and support from other teachers.     

Child developmental impact of Pittsburgh’s Early Childhood Initiative (ECI) in high-risk communities: first-phase authentic evaluation research

The national debate surrounding the issue of school failure has renewed interest in the quality, efficacy, and outcomes of early childhood intervention programs that can promote early school success for children at developmental risk. Moreover, researchers and policymakers report the need to document developmentally-appropriate models for assessing and evaluating early childhood outcomes. We report on the first-phase results of Pittsburgh’s early childhood initiative (ECI). ECI is a privately-funded effort by a consortium composed of the business, corporate, foundation, and community sectors to implement high-quality early care and education options for children in high-risk neighborhoods. The overarching objective of ECI is to ensure early school success for high-risk children. Our Scaling Progress in Early Childhood Settings (SPECS) Evaluation Team implemented an authentic assessment and program evaluation strategy and an enhanced “constructed comparison group” statistical model to conduct longitudinal research on the child developmental impact of the ECI model. First-phase results on 155 high-risk children indicate that those who participated in high-quality ECI programs for the longest periods of time demonstrated patterns of progress that exceeded maturational expectations. Weekly collaborative consultation to teachers and caregivers by consultants about program quality using the National Association for the Education of Young Children (NAEYC) standards as “best practice” benchmarks seemed to be associated with initial enhanced child outcomes and the particular impact of the ECI model.