用户体验视角下国内学术虚拟社区评价指标体系构建——基于D-S证据理论

[目的/意义]构建基于用户体验视角的学术虚拟社区评价指标体系,既有利于提升学术虚拟社区的知识服务水平,也有利于提高其影响力与竞争力,对于学术虚拟社区的持续健康发展具有重要意义。[方法/过程]本文从用户体验视角出发,以D-S证据理论为基础,运用D-S证据合成方法,构建用户体验视角下学术虚拟社区评价指标体系,并计算各级指标的权重系数。[结果/结论]最终得到包含8个一级指标和24个二级指标的学术虚拟社区评价指标体系。其中,可靠性权重为0.2568,易用性权重为0.0625,规范性权重为0.0407,互动性权重为0.0888,关怀性权重为0.1176,丰富性权重为0.0322,有用性权重为0.1784,时效性权重为0.2230。最后以小木虫为例进行了评价分析。     

基于系统性文献回顾法的新型研发机构研究与展望

本文以国内经济管理领域 2003年至2019 年的179篇文献为样本,使用系统性文献回顾法(SLR),探索和总结了新型研发机构的研究现状及其知识结构,分析现有研究的缺失并尝试寻找未来的研究趋势。研究发现: 第一,新型研发机构的知识结构由9个部分构成一个2W1H的主题研究框架。第二,从国家、产业和企业层面分别总结了阻碍新型研发机构发展的因素及其提升对策建议。第三,从研究知识模块、研究切入角度和研究趋势拓展3个方面解剖现有知识断层,并对未来的研究提出具体可行的对策建议     

Ebooks in Academic Libraries

Abstract

The number of ebooks continues to grow in academic libraries. Ebooks have many advantages that make them attractive as a library resource. However, ebooks also have restrictions. These include use and sharing restrictions, license restrictions, and technological barriers. Some students also prefer print books for specific tasks. The following articles examine many aspects of ebooks in academic libraries, including student preference, overall ebook use, and the advantages and disadvantages of various ebook acquisition models.     

Business continuity of business models: Evaluating the resilience of business models for contingencies

Company business models are vulnerable to various contingencies in the business environment that may unexpectedly render their business logic ineffective. In particular, technological advancements, such as the Internet of things, big data, sharing economy and crowdsourcing, have enabled new forms of business models that can effectively and abruptly make traditional business models obsolete. By disrupting or even diminishing companies’ revenue streams, environmental contingencies may present a significant threat to business continuity (BC). Evaluating the resilience of business models against these contingencies should therefore be a core area of BC. However, existing BC approaches tend to focus on the continuity of the resources and processes through which a particular business model is accomplished in practice but omit the business model itself. We argue that in order for BC approaches to become holistic and strategic, business models need to become a part of the BC considerations, entailing an expansion of the scope of BC from value preservation to value creation. We propose an approach of Strategic Business Continuity Management, which consists of two parts: (1) sustaining the continuity of the company business model (value preservation) and (2) evaluating and modifying the business model (value creation). We illustrate conceptually the value creation part with an example drawn from the sharing economy.     

高职院校ESP师资队伍建设探究

ESP(应用英语)教学需要既具有扎实的专业知识,又精通英语的复合型教师。本文在调查分析高职ESP师资现状的基础上,从跨专业、校企合作教学、ESP虚拟教学团队和学校政策支持几个方面探讨适合地方普通高职院校ESP师资队伍建设的策略,以期对相关院校ESP师资队伍建设有所启示。     

Score Reporting for Examinees with Incomplete Data on Large‐Scale Educational Assessments

Technical difficulties occasionally lead to missing item scores and hence to incomplete data on computerized tests. It is not straightforward to report scores to the examinees whose data are incomplete due to technical difficulties. Such reporting essentially involves imputation of missing scores. In this paper, a simulation study based on data from three educational tests is used to compare the performances of six approaches for imputation of missing scores. One of the approaches, based on data mining, is the first application of its kind to the problem of imputation of missing data. The approach based on data mining and a multiple imputation approach based on chained equations led to the most accurate imputation of missing scores, and hence to most accurate score reporting. A simple approach based on linear regression performed the next best overall. Several recommendations are made regarding the reporting of scores to examinees with incomplete data.     

High-resolution mapping of brain vasculature and its impairment in the hippocampus of Alzheimer's disease mice

Accumulating evidence indicates the critical importance of cerebrovascular dysfunction in the pathogenesis of Alzheimer''s disease (AD). However, systematic comparative studies on the precise brain vasculature of wild-type and AD model mice are still rare. Using an image-optimization method for analysing Micro-Optical Sectioning Tomography (MOST) data, we generated cross-scale whole-brain 3D atlases that cover the entire vascular system from large vessels down to smallest capillaries at submicron resolution, for both wild-type mice and a transgenic (APP/PS1) mouse model of AD. In addition to distinct vascular patterns in different brain regions, we found that the main vessels of the molecular layer of the hippocampal dentate gyrus (DG-ml) undergo abrupt changes in both diameter and branch angle, spreading a unique comb-like pattern of capillaries. By using a quantitative analysis workflow, we identified in the hippocampus of AD mice an overall reduction of the mean vascular diameter, volume fraction and branch angle, with most significant impairment in the DG-ml. In addition, virtual endoscopy revealed irregular morphological features in the vessel lumen of the AD mice, potentially contributing to the impairment of blood flow. Our results demonstrate the capability of high-resolution cross-scale evaluation of brain vasculature and underscore the importance of studying hippocampal microcirculation for understanding AD pathogenesis.     

Scapular motion adaptations in junior overhead athletes: a three-dimensional kinematic analysis in tennis players and non-overhead athletes

Adult overhead athletes without a history of shoulder injury show scapular adaptations. There is a lack of detailed assessment of scapular kinematics in junior overhead athletes. This study aims to investigate three-dimensional scapular kinematics in junior overhead athletes. We recruited a total of 20 junior tennis players and 20 healthy children without participation in any overhead sports in this study. Bilateral scapular kinematic data were recorded using an electromagnetic tracking device for scapular plane glenohumeral elevation. The data were further analysed at 30°, 45°, 60°, 90° and 120° during glenohumeral elevation and lowering. Statistical comparisons of the data between groups (junior overhead athletes and non-overhead athletes) and sides (serve dominant and non-dominant shoulders of the overhead athletes) were analysed with the ANOVA. Comparisons showed that, in general, the scapula was more upwardly rotated and anteriorly tilted in overhead athletes when compared to non-overhead athletes, however there was no side-to-side differences when serve dominant and non-dominant shoulders compared in junior overhead athletes. The serve dominant arm of junior overhead athletes had alternations in scapular kinematics when compared with the non-overhead athletes. These findings provide clinical evaluation implications and the need for clinicians to assess for potential adaptations in junior overhead athletes.