课堂中的师生语言互动是为了什么--从一个临床观察片段透视课堂中师生语言互动存在的问题

采用随机方式选择一堂常规小学语文阅读教学的第一教时为观察对象,运用"提问技巧观察量规"对教学开始的第8分钟至第14分钟进行观察,透视课堂中师生语言互动存在的问题.提出课堂中的师生语言互动不是为了通过语言互动连接教学程序,更不是为了让课堂教学活动变得很热闹,而是为了启发学生的思维,让学生进行更有深度的思考.     

The Middle East Books Market: a Personal Overview

A concise review is presented of the essential elements of the book publishing and bookselling business in a complex and diverse market. Demographics create the diversity while Arabic is the one language spoken across a multitude of different countries. Three features are common to all of these countries and they are: the dominance of English as the second language, education has and will remain to be a priority, and economic pressures cause price sensitivity to be a major challenge especially in the educational market segments. It is the price sensitivity as a key factor for the lack of respect for intellectual property and copyright regulations. A review of distribution and retail stores is a very important topic in relation to this complex collection of countries. The emergence of e-books is discussed especially in the educational, professional and reference market segments. Finally, there is a review of the Arabic language publishers and local book fairs to bring this article to closure.     

Finding related sentence pairs in MEDLINE

We explore the feasibility of automatically identifying sentences in different MEDLINE abstracts that are related in meaning. We compared traditional vector space models with machine learning methods for detecting relatedness, and found that machine learning was superior. The Huber method, a variant of Support Vector Machines which minimizes the modified Huber loss function, achieves 73% precision when the score cutoff is set high enough to identify about one related sentence per abstract on average. We illustrate how an abstract viewed in PubMed might be modified to present the related sentences found in other abstracts by this automatic procedure.     

Statistical query expansion for sentence retrieval and its effects on weak and strong queries

The retrieval of sentences that are relevant to a given information need is a challenging passage retrieval task. In this context, the well-known vocabulary mismatch problem arises severely because of the fine granularity of the task. Short queries, which are usually the rule rather than the exception, aggravate the problem. Consequently, effective sentence retrieval methods tend to apply some form of query expansion, usually based on pseudo-relevance feedback. Nevertheless, there are no extensive studies comparing different statistical expansion strategies for sentence retrieval. In this work we study thoroughly the effect of distinct statistical expansion methods on sentence retrieval. We start from a set of retrieved documents in which relevant sentences have to be found. In our experiments different term selection strategies are evaluated and we provide empirical evidence to show that expansion before sentence retrieval yields competitive performance. This is particularly novel because expansion for sentence retrieval is often done after sentence retrieval (i.e. expansion terms are mined from a ranked set of sentences) and there are no comparative results available between both types of expansion. Furthermore, this comparison is particularly valuable because there are important implications in time efficiency. We also carefully analyze expansion on weak and strong queries and demonstrate clearly that expanding queries before sentence retrieval is not only more convenient for efficiency purposes, but also more effective when handling poor queries.     

Book Distribution in the Arab World

Business opportunities in international markets are largely determined by accessibility, transparency, and legal frameworks fair to all parties concerned. Arab book markets in principle offer a tremendous potential with more than 300 million readers sharing one common language. Besides unsolved censorship issues, problems with money collection, and differing regulations, however, the lack of a uniform book distribution system is the most critical hurdle for the development of a common Arabic book market. Most importantly, there is no comprehensive database containing accurate content briefs, background information on authors, ISBN numbers, and publisher company information as well as all relevant commercial data such as book prices, weight, logistics terms, and availability. Authors and publishers are hard hit as they often need to organize book transportation, delivery, and invoice collection on their own. At present, “selling book fairs” in the Arab world—with the exception of Abu Dhabi International Book Fair—present themselves as crowded book bazaars rather than executive meeting points. The authors of the article, however, are anticipating change: New distribution initiatives will soon interlink regional Arabic markets and create unique growth and profit opportunities.     

Room for archives? Use of archival materials in <Emphasis Type="Italic">No Gun Ri</Emphasis> research

Archivists have long tried to understand users from the viewpoint of their archival collections. Such an approach misses important perspectives about use in, and users of, archives; how they perform research and develop knowledge while using archives. This study aims to comprehend the use of archival materials in research from the users’ perspective. It attempts to understand users’ perceptions of the impact of archival collections on their research, how and when archival materials are involved in the research process and how much weight they grant those materials in support of their thesis, from an actual research topic, the No Gun Ri massacre. The case of the No Gun Ri incident provides a good example of how archival materials play a role in historical discussions and an opportunity to look at archival contributions. No Gun Ri researchers acknowledged that archival documents were essential source materials for details about the incident and a major player in stimulating controversies and, consequently, provided the impetus for further publications. General recordkeeping situations also provided a circumstantial context of the incident. However, No Gun Ri researchers agreed that oral history was the most valuable and influential evidence for their major ideas and used archival documents to provide hard facts about the details of oral history. There are some unique research patterns of No Gun Ri researchers identified in this study which are different from the typical assumptions of archivists.