Measuring Search Engine Quality   总被引：12，自引：3，他引：9  

David Hawking  Nick Craswell  Peter Bailey  Kathleen Griffihs 《Information Retrieval》2001,4(1):33-59

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.  相似文献   

E-Learning by design     

Joe Landsberger 《TechTrends》2004,48(3):6-9

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The Provision for Personal, Social, Health Education (PSHE) and Citizenship in School-based Elements of Primary Initial Teacher Education     

Nick Mead 《Pastoral Care in Education》2004,22(2):19-26

This small-scale research study looks at the PSHE/Citizenship framework and the opportunities for student teachers to understand and experience within school the relationship between values, personal and social development and learning. A questionnaire was given to two sets of student teachers on their final school-based placements. The research suggests that there needs to be greater recognition of the centrality of multi-cultural awareness and understanding within the political literacy section of the PSHE/Citizenship framework. This is the counterpart to a previous study of the opportunities for values education within the university-based elements of Primary Initial Teacher Education ( Mead, 2003 ).  相似文献   

高三学优生的心理问题分析及对策     

饶挺 《当代教育论坛》2009,(10)

高三学优生存在着追求完美、敏感脆弱、自我中心、心理失衡、自负自私、与他人关系紧张等心理问题.针对这些,教师可采用积极沟通,排遣其心理郁结,打磨良好的心理素质;精巧指导,折服其自负心理,教会感恩的心理品格;努力引领,启发其正确定位,培养协作的团队精神等对襞寻求解决.  相似文献   

E-Learning by Design     

Landsberger  Joe 《TechTrends》2005,49(1):6-9

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Study Guides and Strategies: an interview with the interviewer     

Joe Landsberger 《TechTrends》2001,45(3):49-50

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Planning for the future: learning from the past     

Nick Gibbs Director of Community Services 《Cultural Trends》2004,13(3):37-39

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Public library trends     

Nick Moore 《Cultural Trends》2004,13(1):27-57

Public libraries tend to be taken for granted. They can be found in nearly every community and are used by a substantial proportion of the population, particularly the young and the old. Yet the public library service, as it is today, is a relatively recent phenomenon. Despite their origins in the mid-19th century, the widespread network of public libraries is largely the product of the post-war welfare state. The demand for the service grew rapidly during the war and in the immediate post-war period. Provision to meet the demand was constrained initially by the competing demands for reconstruction, but by 1960 the service was ready to expand. The growth was consolidated by the 1964 Public Libraries and Museums Act and was given further emphasis by the 1962 Bourdillon standards (Ministry of Education, 1962). The Act and the standards provided the impetus for what might be described as the golden age of public libraries. This brief period was brought to an abrupt end by the economic crises of the mid-1970s and the subsequent downward pressure on public expenditure. The service managed to hold its own during the late 1970s and early 1980s but since then it has been in decline, with the rate of decline accelerating during the 1990s as new requirements and increasing costs stretched diminishing resources even further, to the point where the overall level of provision now falls well short of the basic standards that were considered to be essential in the early 1960s.  相似文献   

江西农村居民开展武术活动的现状与发展建议     

王俊奇  刘国华  饶爱蓉 《搏击·武术科学》2004,(2)

为了解江西农村居民开展武术活动的情况,为江西全民健身提供指导,通过问卷调查,文献资料,专家访谈等方法,对江西农村居民的武术观念、习武行为和制约因素及发展趋势进行研究,针对以上现状提出江西农村居民参加活动的发展建议。  相似文献   

外包制胜--华中农业大学图书馆编目业务外包的实践与思考   总被引：17，自引：0，他引：17  

余红  饶思军 《图书馆杂志》2006,25(3):51-54

本文以华中农业大学图书馆委托书商进行编目业务外包为实例，论述了图书馆在外包市场不太成熟的环境中如何运作，才能在业务外包活动中制胜的方方面面。并就编目业务外包的健康发展问题提出了自己的思考。  相似文献