A study of results overlap and uniqueness among major Web search engines

The performance and capabilities of Web search engines is an important and significant area of research. Millions of people world wide use Web search engines very day. This paper reports the results of a major study examining the overlap among results retrieved by multiple Web search engines for a large set of more than 10,000 queries. Previous smaller studies have discussed a lack of overlap in results returned by Web search engines for the same queries. The goal of the current study was to conduct a large-scale study to measure the overlap of search results on the first result page (both non-sponsored and sponsored) across the four most popular Web search engines, at specific points in time using a large number of queries. The Web search engines included in the study were MSN Search, Google, Yahoo! and Ask Jeeves. Our study then compares these results with the first page results retrieved for the same queries by the metasearch engine Dogpile.com. Two sets of randomly selected user-entered queries, one set was 10,316 queries and the other 12,570 queries, from Infospace’s Dogpile.com search engine (the first set was from Dogpile, the second was from across the Infospace Network of search properties were submitted to the four single Web search engines). Findings show that the percent of total results unique to only one of the four Web search engines was 84.9%, shared by two of the three Web search engines was 11.4%, shared by three of the Web search engines was 2.6%, and shared by all four Web search engines was 1.1%. This small degree of overlap shows the significant difference in the way major Web search engines retrieve and rank results in response to given queries. Results point to the value of metasearch engines in Web retrieval to overcome the biases of individual search engines.     

利用MSN Messenger与Web Quest模式结合进行化学教学

本文对MSN Messenger在教学中的应用进行初探,并以"自然界中的水"为例将MSN Messenger作为基于Internet的化学课程的学习方式WebQuest(网络探究)的实现方式进行探讨.     

基于网络聊天软件的对外汉语口语辅助性教学

对外汉语口语教学是对外汉语教学的一个重要组成部分,当前传统的对外汉语口语教学存在着很多弊端。基于此,文章以网络聊天软件为载体,尝试设计一种辅助性的对外汉语口语教学方法,以更好地弥补传统对外汉语口语课堂的不足,这在一定程度上有利于培养留学生真正的言语交际能力。     

图书馆MSN咨询机器人的研究与实现

为解决图书馆实时咨询服务受到工作时间和人员限制的问题,在分析国内图书馆智能机器人发展现状的基础上,提出一种基于BotPlatform平台的图书馆MSN咨询机器人的设计方案,详细介绍系统的架构、各功能模块的实现以及在图书馆中的使用情况,并指出下一步改进目标。     

The effect of an MSN agent on learning community and achievement

The use of instant messaging to support e-learning will continue to gain importance because of its speed, effectiveness, and low cost. This study developed an MSN agent to mediate and facilitate students' learning in a Web-based course. The students' acceptance of the MSN agent and its effect on learning community identification and learning achievement were investigated using the technology acceptance model. Results indicated that the MSN agent proved easy to use, and that students recognized its benefits with regard to their learning. In more detail, students perceived that the MSN agent would be beneficial to learning community identification, but this perceived usefulness had less effect on their learning achievement. However, it was found that perceived system usage of the MSN agent was significantly related to learning achievement, which differed from the result of analyzing students' perceived usefulness of the agent. Rather than using a systematic recording log, the perceived system usage of the MSN agent was measured through questionnaires. Interview feedback revealed that effective learning was related to the learners' engagement in the MSN agent and not just from their perceived usefulness of it. Therefore, the MSN agent could have more potential to facilitate students' learning in an online environment if learning activities related to study are designed to promote students' engagement.     

Information Science in the Curriculum

ABSTRACT

This article takes an in-depth look at the Internet mega search engines and their influence on reference librarianship.     

SIP协议的研究

目前VoIP的主流技术标准有H.323协议和SIP协议两种，H.323提出的时间较早，目前得到了广泛的应用。由于SIP灵活性、可扩展性等优点，基于SIP协议的终端占据了越来越多的市场。因此，对于SIP协议的研究是一个很有意义的课题。论文首先分析了SIP协议，详细介绍了它的协议结构和呼叫过程，然后以MSN为例分析了其会话的过程。     

利用MSN Space进行化学研究性学习

本文对MSNMessenger中的共享空间(MSNSpace)在教学中的应用进行分析,主要以"自然界中的水"一课为例,将MSNSpace作为基于Internet的化学课程的研究性学习方式WebQuest的实现方式进行探讨。     

移动社交网络用户对产品推荐信息反应意愿研究

[目的/意义]研究移动社交网络情境中用户与联系人关系、用户感知联系人行为如何影响用户对产品推荐信息反应意愿,并就研究结果提出管理对策。[方法/过程]通过手机微信平台收集的316份有效问卷,运用偏最小二乘回归法对数据进行分析。[结果/结论]结果表明：对联系人推荐的认知信任和情感信任正向影响用户对产品推荐信息反应意愿;亲密度和过去经历正向影响联系人推荐的认知信任和情感信任;过度发布行为负向影响联系人推荐的认知信任和情感信任。但是,相似性与对联系人推荐的认知信任和情感信任之间关系未获得支持。