Extreme value theory applied to document retrieval from large collections

We consider text retrieval applications that assign query-specific relevance scores to documents drawn from particular collections. Such applications represent a primary focus of the annual Text Retrieval Conference (TREC), where the participants compare the empirical performance of different approaches. P^(K), the proportion of the top K documents that are relevant, is a popular measure of retrieval effectiveness. Participants in the TREC Very Large Corpus track have observed that when the target is a random sample from a collection, P^(K) is substantially smaller than when the target is the entire collection. Hawking and Robertson (2003) confirmed this finding in a number of experimental settings. Hawking et al. (1999) posed as an open research question the cause of this phenomenon and proposed five possible explanatory hypotheses. In this paper, we present a mathematical analysis that sheds some light on these hypotheses and complements the experimental work of Hawking and Robertson (2003). We will also introduce C^(L), contamination at L, the number of irrelevant documents amongst the top L relevant documents, and describe its properties. Our analysis shows that while P^(K) typically will increase with collection size, the phenomenon is not universal. That is, the asymptotic behavior of P^(K) and C^(L) depends on the score distributions and relative proportions of relevant and irrelevant documents in the collection. While this article went to press, Yehuda Vardi passed away. We dedicate the paper to his memory.     

武汉大学引进文科图书中心书库文献保障策略

教育部引进文科图书中心书库的目的在于为建立区域性的图书文献保障体系提供支撑条件,文章从采选机制、馆藏范围、馆藏数量与馆、藏学科分配等多个方面论述了武汉大学中心书库为做好区域文献保障工作所采取的策略.     

博弈论:分析文献信息资源共享的新方法

本简要介绍了博弈论的发展及博弈论的基本类型和要素，通过分析博弈与献信息资源共享主体活动的关系，得出献信息资源共享的过程就是各种主体间的博弈过程。并且论证了博弈论是分析献信息资源共享现状及根本障碍的有效方法。     

网络二次文献与二次文献服务

搜索引擎是二次文献在网络上的一种表现形式，是网络二次文献服务的有力工具，应该优化搜索引擎，完善网络二次文献服务。     

从“知沟”理论到“农家书屋”图书配置

通过对“知沟”理论的内涵解读,明确了我国城乡“知沟”现象存在的原因,结合当前“农家书屋”建设,提出了城乡间“农家书屋”图书配置的对策。     

信息沟通理论在高校图书采访工作中的应用

在阐述信息沟通理论概念、基本要素及过程的基础上,具体分析了在信息的发送、传递和接收过程中存在的各种沟通障碍及信息沟通理论在高校图书采访工作中的应用,提出了增强有效沟通的三项措施.     

The source study concept of general document theory: Theoretical and organizational aspects (a review)

This paper analyzes the source study concept of the general document theory developed by Dr. Sci. (Hist.) professor V. P. Kozlov. The means of its subsequent development are determined, the problem’s methodological and organizational aspects are noted, and methods of their solution are suggested.     

基于零增长理论的随书光盘系统实践

介绍图书馆随书光盘系统遇到的问题,结合零增长理论和信息生命周期的相关概念,提出随书光盘系统的改进思路,并提供实现的软件原型.     

编辑工夫与图书质量

一个优秀的图书编辑必须能够提出选题构想、确定作者、形成写作大纲、跟踪编写进程、控制书稿质量;对书稿内容进行评价、选择和把关,决定取舍;整合体例结构、润色语言表达、配合图片,设计版式装帧,最终形成一本内容完整、结构合理、层次清晰、表述规范,语言优美、通俗易读的好书。本文总结编辑工作的实践经验,针对编辑如何下工夫提高图书的质量和可读性,提出三点建议。