从概念角度论述保持电子文件真实性的要求

电子文件真实性问题的研究成为电子文件管理的重中之重,有必要确定评估和维护永久保存的电子文件的真实性的要求。然而在讨论这些要求之前,有必要解释确定要求的概念基础。在本文中,将概念要求分为两个部分,第一部分要求包括支持电子文件真实性假设的要求;第二部分要求包括支持电子文件真实性拷贝的要求。     

基于工程项目设计理念的电子信息工程课程体系建设

课程体系建设是教学改革的重点,科学合理地制定课程体系方案,是学校教改的核心和重点。本文基于工程项目设计理念,对我校电子信息工程专业课程体系建设进行了研究和探索,阐述了课程体系建设、课程衔接和实践教学环节等方面的实施方案。     

Resource discovery in distributed digital libraries through visual knowledge navigation

INTRODUCTION In this paper, we present our work in the Strand Map Service (SMS), which provides concept map based browsing interfaces for resource discovery in a library independent manner within American Na- tional Science Digital Library (NSDL). As critical components of digital libraries, dis- covery systems provide interfaces that support user to search and browse for resources in digital libraries (Hall et al., 1999). The effectiveness of discovery systems has big impact on the…     

数字图书馆的服务理念琐谈

针对数字图书馆的新特点，从为用户服务的角度出发，论述了参考咨询、信息资源存取、电子信息咨询、服务重心的转化问题。     

基于资本项目的纳斯达克中国网络概念股竞争力比较分析

运用因子分析方法,针对NASDAQ中的13家中国网络概念股企业,就一些资本、财务方面的指标,进行了比较分析,提出了网络企业应该重视赢利能力培养的意见。     

综合英语课程教学的认知转向探索

受认知诗学理论的影响,综合英语课堂教学将更加注重学生的学习心理过程和学习效果。认知诗学语境下的概念型教学法除了关注英汉对比意识在学生思维中的养成,在综合英语教学中将更多地聚焦于以概念为中心的单元主题在学生认知过程中的内化。概念型教学法的五个教学步骤,即解释、物化、交际活动、言语化、内化,可以有效地将教学内容前景化以提高学生学习效果,并有助于培养学生创造性的学习和批判性思维的养成。     

The development of students critical thinking abilities and dispositions through the concept mapping learning method – A meta-analysis

Our meta-analysis investigates the effectiveness of the concept mapping method compared with the traditional teaching method, for the improvement of critical thinking ability and disposition outcomes. We included studies measuring students' critical thinking through standardised tests, comparing an experimental (concept mapping) group with a control (traditional teaching) one. Effect sizes for critical thinking ability and disposition outcomes were pooled with a random-effects model. We included in our meta-analysis 21 studies (108 comparisons) involving 1695 students. The concept mapping method was more effective than the traditional teaching method at posttest for the improvement of critical thinking ability (g = 0.531, 95% CI 0.279 to 0.783) and disposition (g = 0.648, 95% CI 0.266 to 1.031). Heterogeneity was moderate to high, Egger's test did not indicate any evidence of publication bias; however, both visual inspection of the Funnel plot and Duval and Tweedie's trim and fill method indicated potentially three missing studies for critical thinking ability and two for critical thinking disposition. Additionally, we analysed the potential moderating effect of students' demographic characteristics, educational conditions, concept mapping elaboration methods and allocation type. Allocation type was a significant moderator, having a strong effect on concept mapping for critical thinking abilities in randomised studies (g = 0.739, 95% CI 0.356 to 1.122), but its effect is low in non-randomised studies (g = 0.265, 95% CI 0.014 to 0.517).     

Information resources estimation for accurate distribution-based concept drift detection

Machine learning applications must continually utilize label information from the data stream to detect concept drift and adapt to the dynamic behavior. Due to the computational expensiveness of label information, it is impractical to assume that the data stream is fully labeled. Therefore, much research focusing on semi-supervised concept drift detection has been proposed. Despite the large research effort in the literature, there is a lack of analysis on the information resources required with the achievable concept drift detection accuracy. Hence, this paper aims to answer the unexplored research question of “How many labeled samples are required to detect concept drift accurately?” by proposing an analytical framework to analyze and estimate the information resources required to detect concept drift accurately. Specifically, this paper disintegrates the distribution-based concept drift detection task into a learning task and a dissimilarity measurement task for independent analyses. The analyses results are then correlated to estimate the required number of labels within a set of data samples to detect concept drift accurately. The proximity of the information resources estimation is evaluated empirically, where the results suggest that the estimation is accurate with high amount of information resources provided. Additionally, estimation results of a state-of-the-art method and a benchmark data set are reported to show the applicability of the estimation by proposed analytical framework within benchmarked environments. In general, the estimation from the proposed analytical framework can serve as guidance in designing systems with limited information resources. This paper also hopes to assist in identifying research gaps and inspiring new research ideas regarding the analysis of the amount of information resources required for accurate concept drift detection.     

现代远程教育质量观的哲学思考

随着现代远程教育的发展,电大开放教育进入一个较为成熟的发展时期,需要更为理性的解决规模数量和质量效益之间的关系,只有不断提高和确保质量才能使电大具有健康可持续发展的生命力。从科学发展观视角进行分析,只有首先解决质量观的转变才能解决好存在的矛盾,使系统运作沿着内涵式发展道路迈进。     

谈21世纪高校图书馆创新模式

信息技术的快速发展给图书馆工作带来了机遇与挑战,只有在观念、管理及服务等方面进行大力创新,才能极大地丰富图书馆服务内容,强化图书馆能力,进而创造出图书馆最佳的社会效益和经济效益.