网络计量学

本文回顾了计量学的产生和发展的历程，指出在网络环境下网络计量学产生的必然性。并着重探讨了网络计量学的主要特征、研究方法、研究对象范围和在网络环境中的应用。     

利用分类法和主题法改善搜索引擎的性能

本文对Internet上的检索工具搜索引擎的工作机理和性能进行了全方位的探讨，指出了常见搜索引擎信息检索缺点。同时还指出了Meta搜索引擎、智能搜索引擎和代理搜索引擎虽然提高了网络信息检索的质量，但由于分类体系不统一，类目划分标准模糊，因而仍然未能从根本上改变搜索引擎主要以关键词（自然语言）作为检索入口的现状，不能实现分类检索与主题检索的一体化。要实现搜索引擎信息检索的突破，笔者认为有必要运用情报检索语言的理论和方法来完善因特网搜索引擎的性能，实现分类、主题一体化的检索机制，克服分类检索语言单纯以学科聚类、主题语言单纯以事物聚类的局限性。     

科技查新与高校科研关系探讨

科技查新在高校科研工作中发挥着重要作用，同时。加强科技查新与高校科研管理工作的协同，将更有利于科技查新和科研工作的共同提高。     

《中文期刊数据库》Web版检索方法与技巧初探

作者长期从事计算机文献检索工作，通过对《中刊库》Web版的实际检索，初步探索出新版检索系统的一些检索技巧，抛砖引玉，供使用该系统的读者借鉴。     

Facing and bridging gaps in Web searching

Drawing on the ideas of the Sense-Making approach, the ways in which people face and bridge gaps in Web searching are analyzed. The empirical study is based on videotaped Web searches conducted by seven participants. Altogether 11 gaps and 13 search tactics of various types were identified. The gaps faced by the searchers originated from three major factors: problematic content of information, insufficient search competence and problems caused by the search environment. Of individual gaps, no relevant material available, inaccessible content and confusion were most frequent. Of the search tactics used in gap-bridging, following links and activating the Back button were most popular. Gaps related to the problematic content of information led the informants to redirect the search to find Web pages that focus better on the search topic. If the movement was stopped by insufficient search competence, the searchers tended to return to material that was familiar from earlier use contexts in order to regain control of the search process. Alternatively, they tried to specify the search terms. In cases where the search was interrupted by technical problems or other factors originating from the search system, gap-bridging aimed at returning to familiar and technically reliable links. The Sense-Making theory provides relevant conceptual tools to approach the dynamic and discontinuous nature of Web searching in terms of gap-facing and gap-bridging. The concept of gap-facing enables a context-sensitive analysis of the ways in which Web search processes may be stopped. Gap-bridging indicates a general level motive to find alternative ways to continue searching.     

Impact of commercial search engines and international databases on engineering teaching and research

For the last three decades, the engineering higher education and professional environments have been completely transformed by the ‘electronic/digital information revolution’ that has included the introduction of personal computer, the development of email and world wide web, and broadband Internet connections at home. Herein the writer compares the performances of several digital tools with traditional library resources. While new specialised search engines and open access digital repositories may fill a gap between conventional search engines and traditional references, these should be not be confused with real libraries and international scientific databases that encompass textbooks and peer-reviewed scholarly works. An absence of listing in some Internet search listings, databases and repositories is not an indication of standing. Researchers, engineers and academics should remember these key differences in assessing the quality of bibliographic ‘research’ based solely upon Internet searches.     

Automated Latent Growth Curve Model Fitting: A Segmentation and Knot Selection Approach

Latent growth curve models are widely used in the social and behavioral sciences to study complex developmental patterns of change over time. The trajectories of these developmental patterns frequently exhibit distinct segments in the studied variables. Latent growth models with piecewise functions for repeated measurements of variables have become increasingly popular for modeling such developmental trajectories. A major problem with using piecewise models is determining the precise location of the point where the change in the process has occurred and uncovering the related number of segments. The purpose of this paper is to introduce an optimization procedure that can be used to determine both the segments and location of the knots in piecewise linear latent growth models. The procedure is illustrated using empirical data in order to detect the number of segments and change points. The results demonstrate the capabilities of the procedure for fitting latent growth curve models.     

搜索引擎的发展探述

对第二代搜索引擎的现状进行了全面客观的分析,总结归纳出其当今所面临的困境,并以此为基础,提出了搜索引擎将采用何种新技术来提高搜索引擎的性能,实现更加智能化、个性化的搜索     

一种个性化Agent元搜索引擎技术

在使用元搜索引擎进行检索的过程中,由于返回结果的数量较大,不利于用户快速、准确地找到所需信息.本文提出一种基于Agent的元搜索引擎结果优化技术,旨在通过建立需求模型对检索结果进行优化,从而针对用户各自不同的需求提供更具个性化的信息.     

Internet信息最优查询设计

本文分析了信息查询的方法及主要搜索引擎的特点，设计了信息最优查询的步骤及检索策略。