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   

MGH E-Case Series on CD-ROM     

Marlene B. Smith 《Journal of the Medical Library Association》2001,89(1):91-92

  相似文献   

Medical history for tomorrow—preserving the record of today     

David Pearson 《Health information and libraries journal》2001,18(3):139-143

This paper addresses the need to recognize the importance, and the challenges, of preserving the hugely expanding record of medicine today for historians of the future. We are faced not only with an increase in traditional publishing formats, but also with the rapid growth in electronic communications. Two celebrated medical cases, one from the late seventeenth century and one from the late twentieth, are used to illustrate the differences and the difficulties. The need for active and effective professional collaboration is stressed; libraries should work together to address these issues.  相似文献   

论高校体育教学中学生创新思维能力的培养   总被引：3，自引：0，他引：3  

魏彪 《湖北体育科技》2001,20(2):95-96

通过树立现代体育教学观念、优化体育课堂教学、优选体育教学法等几个方面论述了学生创新思维能力的培养。  相似文献   

浅析足球运动员意志品质及培养方法   总被引：1，自引：1，他引：0  

何勇 《湖北体育科技》2001,20(3):77-78

阐述了足球运动中意志品质的作用和地位、培养足球运动员意志品质的意义及各种方法.  相似文献   

体育技术课教学中的测量与评价     

王亚斌 《体育科学研究》2001,5(3):50-52

体育技术的教学,是以身体素质为基础,运动能力和大脑思维为主导的复杂过程.应该遵循人体生长发育的规律,采取因势利导的原则,运用体育测量的科学性和体育评价的方法指导体育技术的教学.  相似文献   

浅谈影响竞技体操裁判客观公正的若干因素及改进意见     

田克敉  关辉  王昌贵  杨健林 《四川体育科学》2001,(3):45-46

文章分析论述了影响竞技体操裁判工作客观公正的若干因素及其改进意见.利用高科技手段,完善现代化的裁判系统,建立比赛规则模式系统是解决体操裁判工作客观公正的必由之路和最终目标.  相似文献   

gn During Xinhai Revolution Ti     

mesBIAN 《体育科技文献通报》2006,(12)

of Politics And Law,Beijing 102249,China; 2.the First Department of Law,Hebei Professional College of Politics And Law,Hebei Shijiazhang050091,Chian)Xinhai Revolution ended the feudal mo  相似文献   

山东省中学体育师资现状与发展对策研究   总被引：5，自引：0，他引：5  

丁连元  张继忠  刘水之  李伟川  王必琪  于爱丽  王存忠  刘蔚  李录美  原维佳  孙化玉 《山东体育学院学报》2001,17(3):66-69

综合运用各种调查法,对山东省中学体育师资现状进行抽样调查.结果显示:中学体育师资队伍与山东省学校体育发展是“大致相适应“而不是“完全适应“,中学体育教师队伍整体年龄、职称结构趋于合理,中学体育教师队伍学历达标率比其它学科偏低,中学体育教师的地位和待遇有所提高和改善.根据现状分析结果,针对现实问题提出了5点对策与建议.  相似文献   

中国男子足球队大赛期间阵容完整性的研究     

马樟生 《湖北体育科技》2001,20(3):12-14

采用录像观察法、数理统计法和文献资料法对中国队在亚洲杯期间主力阵容与98世界杯前3强主力阵容变化进行比较研究.结果表明:98世界杯前3强队伍主力阵容在比赛期间基本保持完整,而中国队主力阵容在最后一场比赛中极不完整.研究认为:影响中国队比赛阵容完整性的主要因素是战斗性减员和非战斗性减员.建议国家队应配备体能教练和心理学、运动医学、营养学专家;加强运动员的自我保护意识,使运动损伤最小化;合理运用技术动作减少红黄牌的发生.  相似文献