BBS版主自我身份认知研究

本文通过焦点团体和内容分析的研究方法,来尝试探讨BBS版主对自己所拥有的权威身份的认知问题,并进一步探讨了他们线上身份与线下身份的关系。     

An analysis on document length retrieval trends in language modeling smoothing

Document length is widely recognized as an important factor for adjusting retrieval systems. Many models tend to favor the retrieval of either short or long documents and, thus, a length-based correction needs to be applied for avoiding any length bias. In Language Modeling for Information Retrieval, smoothing methods are applied to move probability mass from document terms to unseen words, which is often dependant upon document length. In this article, we perform an in-depth study of this behavior, characterized by the document length retrieval trends, of three popular smoothing methods across a number of factors, and its impact on the length of documents retrieved and retrieval performance. First, we theoretically analyze the Jelinek–Mercer, Dirichlet prior and two-stage smoothing strategies and, then, conduct an empirical analysis. In our analysis we show how Dirichlet prior smoothing caters for document length more appropriately than Jelinek–Mercer smoothing which leads to its superior retrieval performance. In a follow up analysis, we posit that length-based priors can be used to offset any bias in the length retrieval trends stemming from the retrieval formula derived by the smoothing technique. We show that the performance of Jelinek–Mercer smoothing can be significantly improved by using such a prior, which provides a natural and simple alternative to decouple the query and document modeling roles of smoothing. With the analysis of retrieval behavior conducted in this article, it is possible to understand why the Dirichlet Prior smoothing performs better than the Jelinek–Mercer, and why the performance of the Jelinek–Mercer method is improved by including a length-based prior.

虚拟学社的技术支持

虚拟学社在网络教育领域中得到越来越多人的青睐。虚拟学社必须借助于合适的技术来构建。本文介绍了构建虚拟学社的合适技术,并对这些技术的应用进行了一些探讨。     

中国虚拟旅游网站现状分析

以世界范围内网络虚拟旅游迅猛发展为背景, 分析我国虚拟旅游网站发展的现状, 指出我国虚拟旅游网站发展的不足之处以及未来发展的巨大潜力。     

He Asked Me What!?—Using Shared Online Accounts as Training Tools for Distance Learning Librarians

ABSTRACT

This study explores the idea of creating a knowledge base from shared online accounts to use in training librarians who perform distance reference services. Through a survey, follow-up interviews and a case study, the investigators explored current and potential use of shared online accounts as training tools. This study revealed that the participants viewed the concept positively, but many encountered barriers to effectively employing a local knowledge base as a training tool.     

H3(-1)中具有一个常主曲率的曲面

文章讨论H 3(-1)了中具有一个常主曲率的曲面,得到了另一主曲率与该常主曲率之间的关系。     

构建教师网站 转变师生关系

信息技术的发展冲击着整个现代教育,更促使传统的教育思想、教育行为、教育体制、教学模式等发生一系列的变革。本文从建立良好师生关系的角度出发,指出建立教师网站的必要性及此类网站应具备的特性。最后还就构建教师网站应注意的问题作了一些探讨。     

论因特网英语的特点及意义

因特网的产生把人类了一个崭新的文化世界。在因特网这一虚拟世界的发生、发展过程中，因特网语言诞生了。作为英语语言的一个新语体，因特网英语形成了许多独具特色的语言现象。本文从六个方面阐述了因特网的特点及意义：1．格式化语言与意义。2．电子邮件语言与意义。3．符号语言与意义。4．合成词语与意义。5．缩略词语与意义。6．三化语言与意义。     

数字图书馆拓展服务的探讨

随着互联网的发展,数字图书馆的建设呈现多元化的局面,数字图书馆建设及其业务的构建实施迫在眉睫。在收集大量有关国内外先进的数字图书馆在拓展服务业务进展方面的资料及经验的基础上,对数字图书馆的服务业务进行总结归纳展望,并详细列举了当今数字图书馆的服务拓展业务。