基于直接寻找法的电阻抗断层成像

Solution to impedance distribution in electrical impedance tomography （EIT） is an ill-posed nonlinear inverse problem. It is especially difficult to reconstruct an EIT image in the center area of a measured object. Tikhonov regularization with some prior information is a sound regnlarization method for static electrical impedance tomography under the condition that some true impedance distribution information is known a priori. This paper presents a direct search method （DSM） as pretreatment of image reconstruction through which one not only can construct a regularization matrix which may locate in areas of impedance change, but also can obtain an initial impedance distribution more similar to the true impedance distribution, as well as better current modes which can better distinguish the initial distribution and the true distribution. Simulation results indicate that, by using DSM, resolution in the center area of the measured object can be improved significantly.     

Epistemic beliefs in action: Spontaneous reflections about knowledge and knowing during online information searching and their influence on learning

In the present study it was investigated whether high school students are spontaneously able to reflect epistemologically during online searching for information about a controversial topic. In addition, we examined whether activating epistemic beliefs is related to individual characteristics, such as prior knowledge of the topic and argumentative reasoning skill; also whether learning from the Web is influenced by epistemic beliefs in action and the ability to detect fallacies in arguments. The participants (N = 64) were students of Grade 13, who were asked to think aloud during navigation. Qualitative and quantitative analyses were performed. Findings reveal that most participants spontaneously activated beliefs about all four dimensions identified in the literature, that is, about the simplicity/complexity, certainty/uncertainty, justification, and source of knowledge, at different levels of sophistication. Most epistemic reflections were about the source of knowledge. Two patterns of contextualized epistemic beliefs emerged and significantly influenced learning from the Web, which was also affected by participants' ability to identify argumentative fallacies.     

对株洲炎帝陵“寻根祭祖”游的文化思考

“寻根祭祖”游有着深厚的文化内涵。株洲炎帝陵自古被誉为中华文明源头的载体。炎黄子孙寻根祭祖、祭奠炎帝,体现了华夏儿女追寻民族根和魂,祭奠中华始祖的淳朴之心,更体现了中华民族祖先崇拜的原始信仰。     

基于网络技术的信息检索课模式

传统的献信息检索课在现代网络技术的发展下遇到了严峻的挑战。本对新形势下献信息检索课面临的困境、教改模式进行了探讨。     

消费者社会化分享行为及其信息搜寻有效性研究

论文对社会化媒体中消费者信息搜寻行为AISAS的两个重要环节---“分享”和“搜寻”进行研究,首先全面阐述了社会化分享的理论框架,进而分析了消费者的社会化分享在信息搜寻中的作用机制。研究认为,消费者的社群地位、消费者之间的关系以及社会化分享的信息量不同程度地影响消费者信息搜寻的有效性。     

Performance of conceptual framework elements for the retrieval of qualitative health literature: a case study

Objective:A growing volume of studies address methods for performing systematic reviews of qualitative studies. One such methodological aspect is the conceptual framework used to structure the review question and plan the search strategy for locating relevant studies. The purpose of this case study was to evaluate the retrieval potential of each element of conceptual frameworks in qualitative systematic reviews in the health sciences.Methods:The presence of elements from conceptual frameworks in publication titles, abstracts, and controlled vocabulary in CINAHL and PubMed was analyzed using a set of qualitative reviews and their included studies as a gold standard. Using a sample of 101 publications, we determined whether particular publications could be retrieved if a specific element from the conceptual framework was used in the search strategy.Results:We found that the relative recall of conceptual framework elements varied considerably, with higher recall for patient/population (99%) and research type (97%) and lower recall for intervention/phenomenon of interest (74%), outcome (79%), and context (61%).Conclusion:The use of patient/population and research type elements had high relative recall for qualitative studies. However, other elements should be used with great care due to lower relative recall.     

因特网用户信息检索与浏览行为研究

分别揭示了因特网用户信息检索、信息浏览行为的特点 ,比较了网上信息浏览与检索行为中的用户信息需求认知建构过程 ,并在此基础上提出了浏览 检索整合式的网上信息查寻模式     

Learning through engaging in retrospective reflection on a change process in an English course on workplace communication

This study describes a change process of implementing role-plays in a course on workplace communication in English, and of engaging in retrospective reflection. Considering that English education for nursing students in Taiwan has focused on the development of medical terminology and that students’ communicative competence is the main deficiency, the author conducted the change process in a medium-scale district hospital where she worked as a clinical nurse and in a nursing college where she taught English as a part-time teacher. The results show that engaging in retrospective reflection allows a teacher to construct knowledge from experience for professional growth.     

国内外宏观管理与政策研究热点的比较分析

本文基于现有的管理科学学科分类标准 ,以 1990～ 2 0 0 0年各领域发表文章的关键词检索统计为依据 ,通过对检索到的文献的阅读与比较 ,回顾了 2 0世纪最后十年国内外宏观管理与政策研究的现状和特征 ,对国内外研究的热点问题进行了比较分析。研究认为国内宏观管理与政策研究由于受到政府政策的影响 ,过多地关注时事热点 ,而缺乏一个连续的研究思路。