色谱保留指数IR与有机醇结构相关性的拓扑研究

根据拓扑学机理，本文运用多元线性回归分析将37种有机醇化合物的结构拓扑指数与气相色谱保留指数相关联，结果表明，具有良好的结构性质相关关系．     

“以学生为中心”：罗杰斯人本主义的教育思想

罗杰斯是美国著名的人本主义心理学家,他提出了一系列的人本主义教育思想：教育目标论、学习论、教学论以及自主评价观。“以学生为中心”是其教育理论的立足点,他的人本主义教育思想丰富且对当今教育实践具有积极意义。     

基于方案模糊偏好信息的一种多属性决策方法

针对决策者对方案有模糊偏好信息的多属性决策问题,提出一种新的方法.通过构造优化模型,反映决策者对方案的主观偏好信息,求出属性权重向量,从而对方案进行排序.最后利用实例说明该方法的可行性.     

A tale of two tests: The role of topic and general academic knowledge in traditional versus contemporary scenario-based reading

We compared high school students’ performance in a traditional comprehension assessment requiring them to identify key information and draw inferences from single texts, and a scenario-based assessment (SBA) requiring them to integrate, evaluate and apply information across multiple sources. Both assessments focused on a non-academic topic. Performance on the two assessments were moderately correlated (r = 0.57), but the SBA was more difficult (Study 1; n = 342). The two assessments similarly depended on basic reading skills but diverged in the relation to academic knowledge and (non-academic) topic knowledge (Study 2; n = 1107). Academic knowledge was highly predictive of traditional comprehension, but less so for SBA. Topic knowledge was more predictive of SBA than traditional comprehension. Thus, the two assessments tap into similar constructs related to comprehension; however, the level of topic knowledge is more important for performance on scenario-based, multiple-source reading tasks, whereas academic knowledge is more important for traditional reading comprehension tasks.     

多重数字水印技术

数字水印技术在保护数字产品版权等方面起到了重要的作用。随着计算机和因特网技术的飞速发展,对数字水印技术的要求也越来越高,多重数字水印就是应时而生的一种技术。本文从图像与文本两大方面分析总结了多重数字水印的现有算法,讨论了其应用及优缺点并提出了多重数字水印下一步的发展方向,对其进一步研究有着重要的意义。     

基于交叉免疫算法的多用户检测器

基于传统的免疫算法,提出了一种多种群并行遗传交叉免疫的多用户检测器,其在加快收敛速度的同时避免了因近亲繁殖容易造成早熟收敛的缺陷.仿真结果表明:所提出的检测器在误码率方面有良好的性能.     

Goal conflicts and self-regulation: A new look at pupils’ off-task behaviour in the classroom

In this paper, pupils’ misconduct in the classroom is interpreted as a change from on-task to off-task behaviour. This change entails a switch from a current learning behaviour to an activity that is more attractive to the student but that is seen as a discipline problem by the teacher. Thus, academic and non-academic goals of pupils rival one another. Motivational conflict theory is used to elaborate on the premise that a discipline problem is a consequence of goal shift. The theory is used to model off-task behaviour as a failure to coordinate academic and non-academic goals, to ask new research questions, and to draw practical conclusions about educational interventions. The paper closes with suggestions about how to strengthen pupils’ ability to coordinate goals and how teaching can fulfil the various needs pupils pursue.     

How children living in poor areas of Dar Es Salaam,Tanzania perceive their own multiple intelligences

This study was carried out with 1,857 poor children from 17 schools, living in low-income areas of Dar Es Salaam, Tanzania. All children took the ‘Student Multiple Intelligences Profile’ (SMIP) questionnaire as part of a bigger project that gathered data around concepts and beliefs of talent. This paper sets out two aims, first to investigate the structural representation of the self perceived multiple intelligences for this set of children and second to discuss how the best fit model might reflect children’s culture and their school experiences. After carrying out exploratory factor analysis, a four factor first order model was shown to have a good fit. A higher order factor solution was investigated owing to the correlation of two latent constructs. In order to provide some insight into the multiple intelligences construct the relationship between the SMIP items, student test outcomes and attitudes to learning were examined. The item groupings were explored through African cultural beliefs around intelligences indigenous to African communities.     

信息熵在多项选择题质量分析中的应用

多项选择题是各种测试中使用的较为广泛的题型之一,施测后对题目各选项的有效性做出判断可为评价测试质量提供重要参考依据。本文由分析多项选择问题的信息熵入手,给出多项选择题等价选法个数d的计算公式。同时,对多项选择题之间的质量比较问题,给出了使用相对熵的比较方法。     

Multiple description coding with spatial-temporal hybrid interpolation for video streaming in peer-to-peer networks

INTRODUCTION Multimedia services over the Internet are be- coming popular due to the widespread deployment of broadband access. However, the conventional cli- ent-server architecture severely limits the number of simultaneous users, especially for bandwidth inten- sive applications such as video streaming. P2P net- works, on the other hand, offer a solution to the scalability problem. As a node joins a P2P network, it not only consumes resources but also contributes its bandwidth or comp…