Measuring Search Engine Quality

The effectiveness of twenty public search engines is evaluated using TREC-inspired methods and a set of 54 queries taken from real Web search logs. The World Wide Web is taken as the test collection and a combination of crawler and text retrieval system is evaluated. The engines are compared on a range of measures derivable from binary relevance judgments of the first seven live results returned. Statistical testing reveals a significant difference between engines and high intercorrelations between measures. Surprisingly, given the dynamic nature of the Web and the time elapsed, there is also a high correlation between results of this study and a previous study by Gordon and Pathak. For nearly all engines, there is a gradual decline in precision at increasing cutoff after some initial fluctuation. Performance of the engines as a group is found to be inferior to the group of participants in the TREC-8 Large Web task, although the best engines approach the median of those systems. Shortcomings of current Web search evaluation methodology are identified and recommendations are made for future improvements. In particular, the present study and its predecessors deal with queries which are assumed to derive from a need to find a selection of documents relevant to a topic. By contrast, real Web search reflects a range of other information need types which require different judging and different measures.     

Exploring elementary students’ perceptions of disabilities using children's literature

The portrayal of characters in children's literature can be a very powerful influence on young children. Teachers have a responsibility to expose children to characters of all types, including those with disabilities. The goal of this study was to explore how third and fourth grade students responded to characters with disabilities in children's books. We read a total of 12 books that included characters with disabilities to students in two third‐grade and one fourth‐grade class at three elementary schools. We video‐recorded discussions about the books and identified the following four themes, all of which related to influences on students’ responses to the character with a disability: (a) societal messages, (b) academic responses, (c) teacher influence and (d) portrayal of disability. We recommend that teachers carefully select books featuring characters with disabilities based on the way the disability is portrayed in the book, and, after the read‐aloud, use questioning strategies that encourage students to make thoughtful, deep comments rather than giving ‘expected’ responses.     

The Role of Study Habits in Foreign Language Courses

The purpose of this study was to determine which study habits distinguish successful from unsuccessful foreign language learners. Participants were 219 college students from a variety of disciplinary backgrounds, enrolled in either Spanish, French, German or Japanese classes. A canonical discriminant analysis (F [6, 117], p < 0.0001; canonical R = 0.92) revealed that, compared to their high-performing counterparts, students with the lowest levels of foreign language performance tended to report that: (a) they frequently include a lot of irrelevant or unimportant information in their notes; (b) when they have difficulty with their assignments, they do not seek help from their instructor; (c) they put their lecture notes away after taking the test and never consult them again; (d) they have to be in the mood before attempting to study; (e) they have a tendency to doodle or to daydream when they are trying to study; and (f) they do not look up in a dictionary the meanings of words that they do not understand. Implications are discussed.     

Educational inequality in Tasmania: evidence and explanations

In this article, we map the extent of educational inequality within Tasmania, and between Tasmania and the rest of Australia, using National Assessment Program—Literacy and Numeracy (NAPLAN) and senior secondary attainment data. This analysis yields some surprising findings, showing the success of Tasmanian primary and high schools and that Tasmanian educational inequality is most strongly expressed at the senior secondary level. We conclude that using such publicly available data to identify differential achievement within and between jurisdictions would strengthen public policy and practitioner interventions aimed at achieving more equal educational outcomes for students in all schools. Our findings also have implications for research directions in this field, suggesting that by analysis of NAPLAN and My School data across individual schools and jurisdictions academic researchers could assist practitioners gain a deeper understanding of inequalities reproduced by the systems they are working within, while finding examples of schools and systems which show a greater level of success in ameliorating disadvantage.     

教育中的新制度主义

制度理论一直将教育领域作为一个重要的研究对象。近十几年来,在教育领域出现了三个显著的变化,它们分别是教育服务提供从单一走向多元、教育系统结构从松散变为紧密以及教育制度重要性的增加。这些教育制度变化的新对于以往制度理论的基本命题提出了挑战,要求重新审视一些制度关系,如同形性与多样性、合法性与效率、松散性与紧密性、制度约束与制度创新、政府与市场等。这预示着对于教育领域进行制度研究的广阔前景。     

Prolonged static stretching does not influence running economy despite changes in neuromuscular function

The aim of this study was to examine the acute effects of prolonged static stretching (SS) on running economy. Ten male runners (VO2(peak) 60.1 +/- 7.3 ml x kg(-1) x min(-1)) performed 10 min of treadmill running at 70% VO2(peak) before and after SS and no stretching interventions. For the stretching intervention, each leg was stretched unilaterally for 40 s with each of eight different exercises and this was repeated three times. Respiratory gas exchange was measured throughout the running exercise with an automated gas analysis system. On a separate day, participants were tested for sit and reach range of motion, isometric strength and countermovement jump height before and after SS. The oxygen uptake, minute ventilation, energy expenditure, respiratory exchange ratio and heart rate responses to running were unaffected by the stretching intervention. This was despite a significant effect of SS on neuromuscular function (sit and reach range of motion, +2.7 +/- 0.6 cm; isometric strength, -5.6% +/- 3.4%; countermovement jump height -5.5% +/- 3.4%; all P < 0.05). The results suggest that prolonged SS does not influence running economy despite changes in neuromuscular function.