Can constrained relevance feedback and display strategies help users retrieve items on mobile devices?

Searching online information resources using mobile devices is affected by small screens which can display only a fraction of ranked search results. In this paper we investigate whether the search effort can be reduced by means of a simple user feedback: for a screenful of search results the user is encouraged to indicate a single most relevant document. In our approach we exploit the fact that, for small display sizes and limited user actions, we can construct a user decision tree representing all possible outcomes of the user interaction with the system. Examining the trees we can compute an upper limit on relevance feedback performance. In this study we consider three standard feedback algorithms: Rocchio, Robertson/Sparck-Jones (RSJ) and a Bayesian algorithm. We evaluate them in conjunction with two strategies for presenting search results: a document ranking that attempts to maximize information gain from the user’s choices and the top-D ranked documents. Experimental results indicate that for RSJ feedback which involves an explicit feature selection policy, the greedy top-D display is more appropriate. For the other two algorithms, the exploratory display that maximizes information gain produces better results. We conducted a user study to compare the performance of the relevance feedback methods with real users and compare the results with the findings from the tree analysis. This comparison between the simulations and real user behaviour indicates that the Bayesian algorithm, coupled with the sampled display, is the most effective. Extended version of “Evaluating Relevance Feedback Algorithms for Searching on Small Displays, ” Vishwa Vinay, Ingemar J. Cox, Natasa Milic-Frayling, Ken Wood published in the proceedings of ECIR 2005, David E. Losada, Juan M. Fernández-Luna (Eds.), Springer 2005, ISBN 3-540-25295-9     

铋层状结构无铅压电陶瓷的研究进展

铋层状结构无铅压电陶瓷具有优良的铁电性能,适合应用于高温、高频领域以及疲劳特性好的铁电存储器领域.本文介绍了铋层状压电材料的结构特点,综述了铋层压电材料的改性研究;着重综述了铋层状结构压电陶瓷材料的掺杂改性研究进展,并对存在的问题和解决方法进行了分析,为制备出高性能的铋层状结构无铅压电陶瓷材料提供一定的参考价值,经过改性的材料可能应用在铁电显示器中.     

PC的桌面虚拟装配技术

提出了基于PC平台的虚拟装配仿真体系结构,探讨了虚拟装配原型系统,探讨了在虚拟装配中VRML场景的控制技术。装配过程中的碰撞检测算法,装配体零件的位姿调整和实时编辑,以及虚拟配环境的立体显示．最后,给出了运行实例,验证了所构建虚拟装配原型系统的可行性．     

A Review of: “Introduction to Reference Sources in the Health Sciences. 5th Ed. Huber,Jeffrey T.; Boorkman,Jo Anne; and Blackwell,Jean, eds.”

Smart boards, also known as interactive whiteboards (IWBs), are large, interactive, touch-sensitive displays that are mainly used for presentation or educational purposes. While some may not consider this an emerging technology today, changes in the design and capabilities challenge that line of thinking. This column will explain what a smart board is, provide a brief history about it, and describe where it is currently used and why it might be a technology to consider having in a library today.     

基于单片机的点阵式中西文显示器的设计

本文介绍了由单片机AT89C50组成的LED点阵式汉字显示系统的硬件结构、功能特点、显示数据的处理方式、软件框图,并给出部分程序。该系统能完成时间显示、汉字动画处理、循环显示等功能。     

It doesn’t matter,but: examining the impact of ambient learning displays on energy consumption and conservation at the workplace

This study reports an intervention to initiate environmental learning and facilitate pro-environmental behaviour. The purpose was to examine the impact of ambient learning displays on energy consumption and conservation at the workplace, more specifically the evaluation of learning outcome and behaviour change. Using a quasi-experimental design, the empirical study was conducted among employees working at a university campus. For the experimental treatments, ambient learning display prototypes were varied on two design dimensions, namely representational fidelity and notification level. The results do not provide clear evidence that the design of the displays influences learning outcome or that the displays lead to pro-environmental behaviour change. Nevertheless, the sole deployment of the display prototypes eased the comprehension of the information provided and lowered the need for additional information. Thus, ambient learning displays provide a promising framework in the context of environmental learning and beyond.     

谈舞台用LED屏的选择——安全使用LED显示屏的技术要求

为确保舞台使用LED显示屏的安全,探讨LED显示屏安装、消防、用电、接地等方面的技术要求,以防止倾倒、坍塌、坠落、火灾、断电、触电等事故的发生。     

Inside the front door: Tailoring a leisure reading collection to attract an academic population

While some academics still maintain that an academic library is no place for leisure reading, many are in favor of maintaining at least a small distinct collection of such books. Strategically located and attractively displayed, current popular titles have the potential to generate traffic to the library and improve circulation statistics. Having taken the leap at Florida Gulf Coast University Library, a close statistical analysis of this new collection’s circulation over time has revealed not only that we all use it, but also that there are diverse but consistent patterns and preferences at play. Could the collection’s circulation rate be increased by tailoring it to an academic population? This study was designed to find out.     

What Is the Value of Graphical Displays in Learning?

The article reviews studies that explain the role of graphical displays in learning and synthesizes relevant findings into principles for effective graphical design. Three theoretical perspectives provide the framework that organizes the review: dual coding theory, visual argument, and conjoint retention. The three theories are compatible although they are based on different assumptions. Research suggests that graphics are effective learning tools only when they allow readers to interpret and integrate information with minimum cognitive processing. Learners' characteristics, such as prior subject-matter knowledge, visuospatial ability, and strategies, influence graphic processing and interact with graphical design to mediate its effects. Future research should investigate the interplay between display and learner characteristics and how graphical design can address individual differences in learning from graphics.