论现代教育技术辅助英语教学模式

现代教育技术在教育教学领域中的应用，必将导致教学内容、教学手段、教学方法和教学模式的深刻变革，并最终导致教育思想、教学观念、教学理论乃至整个教育体制的根本变革。探索如何运用现代教育技术提高英语教学水平，特别是提高学生的英语应用能力，是近年来研究的热点。计算机多媒体技术辅助英语教学模式、网络辅助英语教学模式和现代远程教育辅助英语教学模式是其重要的三种模式。     

Students’ model-based explanations about natural selection and antibiotic resistance through socio-scientific issues-based learning

Antibiotic resistance (ABR) is a significant contemporary socio-scientific issue. To engage in informed reasoning about ABR, students need to understand natural selection. A secondary science unit was designed and implemented, combining an issues-based approach and model-based reasoning, to teach students about natural selection and ABR. This sequential explanatory mixed methods study explored students’ explanations of natural selection. Students created model-based explanations (MBEs) about ABR and verbally explained generalised natural selection during semi-structured interviews. Students’ MBEs significantly increased in natural selection content, and misconceptions about natural selection and ABR significantly decreased after the unit. However, students’ explanations of generalised natural selection differed from ABR explanations. Students struggled to include mutation as the cause of initial variation when explaining generalised natural selection, whereas students included mutation when explaining ABR but often did so after selection pressure. Qualitative analysis indicated students correctly explained ABR or correctly explained generalised natural selection, but none correctly explained both. Students who did understand ABR struggled to apply their understanding to a context other than ABR. This study demonstrates contextual differences in students’ natural selection ideas and provides implications for natural selection instruction. While ABR is a compelling issue to contextualise natural selection instruction, it may be problematic.     

Pedagogical Dilemmas in the National Literacy Strategy: Primary teachers' perceptions,reflections and classroom behaviour

This paper argues that the National Literacy Strategy (NLS) offers contradictory pedagogical advice to teachers on 'interactive teaching'. It reports research on teachers' perceptions of and responses to this advice and focuses particularly on NLS demands for teaching which is 'well paced with a sense of urgency'. Evidence from case studies and systematic observations of classroom interaction is used to show that whilst teachers vary in their sensitivity to the dilemmas posed by NLS demands, their classroom discourse in the Literacy Hour is quantitatively and qualitatively different from pre-NLS discourse. It is suggested that opportunities for critical reflection on practice are needed to help teachers articulate and resolve the dilemmas created by the imposition of prescribed programmes on personal educational principles.     

语篇知识与英语学习

针对大学生平时的英语学习中存在忽略语篇知识的问题 ,分析了语篇知识在英语学习中的作用 ,提出如何利用语篇知识 ,提高英语学习层次和学习效果的设想     

Automatic question answering using the web: Beyond the Factoid

In this paper we describe and evaluate a Question Answering (QA) system that goes beyond answering factoid questions. Our approach to QA assumes no restrictions on the type of questions that are handled, and no assumption that the answers to be provided are factoids. We present an unsupervised approach for collecting question and answer pairs from FAQ pages, which we use to collect a corpus of 1 million question/answer pairs from FAQ pages available on the Web. This corpus is used to train various statistical models employed by our QA system: a statistical chunker used to transform a natural language-posed question into a phrase-based query to be submitted for exact match to an off-the-shelf search engine; an answer/question translation model, used to assess the likelihood that a proposed answer is indeed an answer to the posed question; and an answer language model, used to assess the likelihood that a proposed answer is a well-formed answer. We evaluate our QA system in a modular fashion, by comparing the performance of baseline algorithms against our proposed algorithms for various modules in our QA system. The evaluation shows that our system achieves reasonable performance in terms of answer accuracy for a large variety of complex, non-factoid questions.     

Cyrus Levinthal,the Kluge and the origins of interactive molecular graphics

In the mid-1960s, a group of scientists at Massachusetts Institute of Technology, led by Cyrus Levinthal, took hold of one of the early interactive graphics terminals and used it to visualize, study and model the structure of proteins and nucleic acids. From this encounter between cutting-edge computer technology and molecular biology emerged the crucial elements for the development of a research-technology field known today as interactive molecular graphics. The following account is not only about how computer graphics technology has literally changed the way scientists view the molecular realm, but also a look at how an epistemic and institutional space was created to integrate this technology into scientific research.     

Standardization of Work: Co-constructed Practice

There is strong pressure to achieve greater uniformity, standardization and application of best practices in the service professions, a sector that is growing in presence and importance. At the same time, there is a conflicting demand for the delivery of high-quality (or high-priced or “knowledge-intensive”) specialized or localized services. Our article analyzes information systems-enabled standardizing of service work through an in-depth interpretative study of an ongoing standardization initiative within the field of nursing. Nursing provides a graphic illustration of the dilemmas involved in the standardization of service work. In nursing, standardization is commonly a feature of projects to improve both efficiency and quality in health care. In contrast to the dominant conception of standardization as a largely top-down, imposed process, we offer a view of standardization as incomplete, co-constructed with users, and with significant unintended consequences. The article contributes by (a) developing a theoretical perspective for the standardization of information-system-embedded service work and (2) providing operational and practical implications for system design and health care management.     

Teachers’ professional learning experiences and their engagement in reflective practice: a replication study

This study investigates the association between teachers’ exposure to different kinds of learning experiences and the degree to which they actively reflect on their teaching. We examine this association using data from 3 samples of teachers and schools in the United States. By examining multiple samples, we sought to strengthen the validity of our conclusions and understand whether and how the relationship between teachers’ engagement in reflection and their learning experiences varies across different kinds of work contexts. In all the 3 samples studied, we found that teachers engaged in reflective practice more often when they had more regular access to embedded learning opportunities which we define as collaborating with peers on instructional matters or working with instruction experts. This consistent result across all 3 samples suggests that embedded learning opportunities may provide a supportive context for teacher reflection across a range of settings.