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.     

网络信息环境下馆藏评价标准的变革

文章以现代图书馆馆藏建设的变革为切入口，评析了传统馆藏评价标准。这些基础上重点探讨了网络信息环境下馆藏评价标准的变革。     

《中图法》第四版“I212/217”类目分类标引方法探析

文章就<中图法>第四版、<中图法(第四版)使用手册>及有关论著涉及的"I212/217各时代作品集"类目分类标引方法和相关例证,进行了类比分析.同时,就自己的理解谈了一点看法和建议.     

大学生网络成瘾性与体育成瘾性行为的比较

成瘾性是一个普遍的现象，有其独特的生理和心理机制，网络性成瘾是一种消极的心理性成瘾，对身心健康具有严重的危害性，应该加强教育和管理；体育性成瘾是一种生理和心理相结合的成瘾行为，对身心健康有积极的作用，应该得到提倡和培养。     

基于Web服务器的XML数据库技术

目前,一个W eb服务器能够容纳大量的各种各样的内容,使得数据量出现了指数级的增长,这相应地也要求要有更有效的数据管理能力和更快、更精确的查询.而基于W eb服务器的XML数据库技术使W eb服务器中的数据处理更加简单化和动态化,在目前具有广阔的应用前景.     

企业人力资源无形损耗探讨

人力资源无形损耗是企业不容回避的一个现实问题。企业由于诸多原因缺乏及时、有效的补给、维护、保养，使员工的智力素质逐渐退化，加剧了人力资源的无形损耗，影响了员工知识、技能及潜能的发挥。人力资源的维护是用人单位为预防人力资源的损耗，保障人力资源更好地发挥作用，实现用人单位和员工的双赢而事先采取的保障措施。人力资源的无形损耗需要给予补给、保养，才能得到正常的维护。     

Web挖掘中的客户隐私权保护浅议

随着Web挖掘应用的日益广泛,隐私权保护研究不断增添新问题和新内容.本文分析了Web挖掘中客户隐私权被侵害的主要方式,并从政府、客户以及网络行业三个角度提出了Web挖掘中客户隐私权保护的策略.     

CAS理论视角下Web2.0序化研究

CAS理论认为宏观的演化过程可以从个体行为规律中找到根源,本文以此为依据从系统微观层面出发,探讨了Web2.0系统的序化机制。本文以CAS理论为蓝图,构建了Web2.0的理论模型,界定了系统主体及各特征机制,并结合豆瓣实例阐释了主体适应与交互导致有序的机理。     

Web2．0环境下的信息过滤方式

本文首先介绍了信息过滤的概念及其类型,接着从信息订阅、信息推送、信息阅读几个方面分析了RSS中的信息过滤;从垃圾信息过滤、个人知识管理、个性化主题社区的形成、博客搜索引擎几个方面分析了Blog中的信息过滤;从信息组织体系、信息发布的质量控制、信息向知识的转换几个方面分析了Wiki中的信息过滤;从分众分类、个性化信息聚合、兴趣聚集和共享几个方面分析了社会书签中的信息过滤,最后总结了目前Web2.0环境下信息过滤方式的特点及存在的问题,并提出未来的信息过滤将最终实现语义级的智能信息过滤。     

The Impact of Museum Purchase on the Auction Prices of Paintings

This study examines how art museumspurchasing policy influences the auction prices ofpaintings. Using a cross section of non-speculativetransactions during the period 1820–1970, we findconsiderable empirical support for the hypothesisthat public museums outside the U.S. pay above averageprices in auction markets providing higher thanaverage yields to private sellers. The typical U.S.private museums appear to be more restricted byfinancial constraints and the development of thegeneral economic conditions than their publiccounterparts.