GPON系统的工作原理研究

吉比特无源光网络GPON技术广泛应用于高校校园网,本文着重从GPON下行帧结构、GPON上行帧结构及GPON的特点对GPON系统的工作原理进行了一些研究和探讨。     

The role of epistemic perspectives in comprehension of multiple author viewpoints

A key challenge of fostering digital literacy is developing learners' ability to construct knowledge from information sources that present diverse viewpoints. This study investigated the relation between learners' epistemic perspectives and their comprehension of authors' viewpoints. Additionally, the study examined if epistemic perspectives and viewpoint comprehension predict information source integration and explored how epistemic perspectives moderate the impact of conflicts on viewpoint comprehension. 170 participants responded to an epistemic thinking assessment, read conflicting or converging blog-posts regarding a socio-scientific controversy, wrote arguments, and completed tasks assessing viewpoint comprehension. Absolutism and multiplism were found to be negative predictors and evaluativism a positive predictor of viewpoint comprehension. Viewpoint comprehension mediated the relation between epistemic perspectives and information source integration in written arguments. Conflicts between sources improved viewpoint comprehension only in high levels of multiplism and evaluativism. The findings advance the understanding of the relation between learners' epistemic thinking and multiple document comprehension.     

基于Web保险信息的语义分析初探

针对Web保险信息用户需求的准确性、连续性特点，原有基于关键词匹配的检索方式已不能适应用户的需求，因此试图应用框架语义学理论，从语义层次上对保险信息相关的词语及概念之间的关系进行分析，并从已建立好的保险理赔语料库中抽出一篇文本进行研究，描述其所需的部分框架及其关系，并提取文本框架相关语义信息，对文本进行语义标注。     

对心理唤醒概念模型理论的理解和修正

对心理唤醒概念的理解和界定，在运动心理学领域的研究非常重要。本文在对心理唤醒概念模型分析的基础上，将其在概念阐述方面的优缺点进行了论述，修正和提出了更完整更系统的心理唤醒概念的多维模型。该模型能更好地澄清心理唤醒概念的实质内涵，清除心理唤醒研究中的概念混乱。     

The differential development of epistemic beliefs in psychology and computer science students: A four-wave longitudinal study

This article analyses the differential development of discipline-specific epistemic beliefs (i.e., beliefs about the nature of knowledge) in computer science and psychology. With regard to computer science, a “hard” discipline, we expected absolute beliefs (knowledge as objective “truths”) to increase over time. In contrast, in the more “soft” discipline of psychology, we expected absolute beliefs to be low and stable, and multiplistic beliefs (knowledge as subjective “opinions”) to follow an inversely U-shaped trajectory. Hypotheses were tested in a three-semester long four-wave study with 226 undergraduates. Data were analysed by multi-group growth modelling for parallel processes. In computer science, absolute beliefs indeed increased over the study period. In psychology, an initial increase in multiplistic beliefs was followed by a steep decrease. We therefore suggest that epistemic “sophistication” should be conceived of as a flexible adaptation of epistemic judgments to the characteristics of specific contexts, and not as a generalized developmental sequence.     

Biased representations of controversial information: Certainty and justification beliefs as moderators

Pre-existing beliefs bias mental representations of socio-scientific controversies in favour of the perspective(s) that endorse(s) them. Several conditions have been proposed to moderate such belief-biased mental representations of controversial information. The present study examined the effects of readers’ prior beliefs on their mental models of textual information on the level of situation-model and text-base representations. The study further investigated the extent that author status, readers’ certainty and justification beliefs moderate the effect of prior beliefs on the readers’ representations. Sixty-two undergraduate students of English as a foreign language read two texts that provided arguments for and against an established controversy in language education. A recognition task was used to assess their situation-model and text-base strengths. The results revealed that readers’ representations were biased towards the information that supported their beliefs at the level of the situation model but not at the level of the text-base. The results further revealed no main or moderating effects for author status on the interaction of beliefs and readers’ mental models of the information. However, readers’ certainty beliefs and beliefs about justification for knowing were shown to moderate the belief-biased representation of the controversial information.     

Socialising Epistemic Cognition

We draw on recent accounts of social epistemology to present a novel account of epistemic cognition that is ‘socialised’. In developing this account we foreground the: normative and pragmatic nature of knowledge claims; functional role that ‘to know’ plays when agents say they ‘know x’; the social context in which such claims occur at a macro level, including disciplinary and cultural context; and the communicative context in which such claims occur, the ways in which individuals and small groups express and construct (or co-construct) their knowledge claims. We frame prior research in terms of this new approach to provide an exemplification of its application. Practical implications for research and learning contexts are highlighted, suggesting a re-focussing of analysis on the collective level, and the ways knowledge-standards emerge from group-activity, as a communicative property of that activity.     

图书馆新型一站式服务平台框架与功能研究

一站式服务平台能将多种信息资源和服务系统集成在一起,通过与用户各种信息终端一站式对接,来满足用户快捷、高效的信息需求。文章在分析当前图书馆新门户发展和用户信息需求特征的基础上,提出基于新门户的信息资源一站式服务平台的框架结构,并分析了其特色功能,希望为图书馆信息资源的优化配置和新fI？建设提供参考。     

广义Banach框架及其稳定性

本文引入了广义Banach框架的概念,研究了该框架所对应的框架算子的特点,利用框架算子给出了一个广义Banach框架判定的充要条件.并且对该框架稳定性进行了研究,推广了Hilbert空间中的广义框架与可测空间上定义的（Ω,μ）框架稳定性的有关结论.     

折叠电动自行车的设计与研究

电动自行车近十年来发展迅猛,是值得人们信赖的一种方便、节能、环保、经济、省力的交通工具。设计一款两用、可折叠的电动自行车,能够实现快速折叠与展开,以采用二级传动更省力,车架结构由两个三角形构成更安全稳定。