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An eye-tracking study of information usage in Web searchWeb search services are among the most heavily used applications on the World Wide Web. Perhaps because search is used in such a huge variety of tasks and contexts, the user interface must strike a careful balance to meet all user needs. We describe a study that used eye tracking methodologies to explore the effects of changes in the presentation of search results. We found that adding information to the contextual snippet significantly improved performance for informational tasks but degraded performance for navigational tasks. We discuss possible reasons for this difference and the design implications for the better presentation of search results.
As an increasingly large fraction of human knowledge migrates to the World Wide Web and other information systems, finding useful information is simultaneously more important and much more difficult. In 2000, Jansen and Pooch estimated that 1 in 28 Web pages that users viewed were search results pages [11]. Today, search is among the most important activities that Web users engage in. Beyond the Web, search is a central activity for users of corporate intranets, specialized databases (from shopping to Medline), and increasingly for personal archives of documents and email.
Given the importance and ubiquity of search, it is remarkable how similar almost all search interfaces are. Users typically type a few words into a query box and receive a rank-ordered list of search results comprising document titles, brief descriptions of the objects and some metadata about the results. On the Web, such interfaces are extremely effective, considering the incrediblyCE-Star Suite for Pocket PC2003/203SE Users Manual GuideThe installation procedure is simple. Please follow the steps bellow: 1. Synchronize your mobile device with your desktop PC. Run the installation program ‘Setup.exe’ from the CE STAR disk’s root directory. An introductory window should appear(Illustration 1-1). 2. Click the [Next>] button to view the standard EULA (End User License Agreement). If you can not see the [Next] or [Start] button of Illustration 1-1 the screen, please press Enter key of your desktop PC keyboard to continue. 3. Click the [Agree] button, and you will be taken to the installation components selection window.(Illustration 1-2).
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Download pdf CE-Star Suite for Pocket PC2003/203SE Users Manual GuideAudi TT Coup Audi TT Roadster Quick reference guideAudi TT Coupé Audi TT Roadster Quick reference guide
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Locking and unlocking the vehicle The central locking system locks and unlocks all the doors. It can be operated via the remote control or by turning the key in the lock. Remote control keys e Unlocking button on vehicles with the security central locking feature Press the button once: This will only unlock the…
Download Audi TT Coupe Roadster Quick Reference PDF EbookWeb Applications With MaypoleThe Maypole web application framework can be used on two levels: first, as a simple way to add an interface to a database (and not much else besides), and second, as a toolkit for building more sophisticated web applications. In principle, there is a continuum of possible usages between these two levels, but it seems best for the purposes of teaching to entirely separate them.
In the first part of this tutorial, we're going to quickly dispatch the first level of operation, putting a front-end onto a database. Not only is this useful in its own right in many cases, it both gives a demonstration of the power and flexibility of Maypole, and provides a useful basis for showing how Maypole applications can be expanded.
As many of you know, I'm not really a Perl programmer any more; instead, I'm a missionary. It's a bit of a strange job, since I don't actually get paid, but I get funded by various supporters. I have a very bad memory, and need to be reminded who my supporters are, how much they pay me, and how I need to get in touch with them to let them know what I'm doing and how their money is being used. This sounds like the ideal job for a little relational database, and so I drew up the following schema:
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Download Power 3GP/iPod/PSP Video Converter PDFTraits in CSharpThe main focus of this work is on identifying interesting and important aspects of introducing traits to CSharp. We also identify required and optional features for statically typed languages as well as conflict situations. The implementation presented in this paper is a simple prototype (a preprocessor) based on the trait flattening property [9]. It is meant to be a study case for a clean implementation.
The main problem concerning traits and statically typed languages like CSharp is about typing traits and to keep the ability to share code easily. Many approaches already exist in theory. This practical work contributes to the research about traits by presenting a simple prototype, showing the possibilities and difficulties in integrating traits in statically typed languages.
Although the focus of this work is on CSharp most of the results are directly applicable to other typed object-oriented languages. The implemented “trait flattening framework”, kept mostly language independent, would also work for most other c-like languages (with only slight modification).
Section 2 shortly introduces traits. The following sections cover the basics about CSharp, give a short overview about a first dirty-prototype done in CSharp itself and contain some more extensive descriptions, results and practical research by doing the final implementation using Smalltalk.
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Astigmatism in an aberration that results when an optical system focuses two orthogonal axes of light at two different distances in space. Holograms and holographic optical elements intentionally produce, or unintentionally suffer, from astigmatism. To explain the basic properties of astigmatism, though, we choose a simpler optical model using spherical and cylindrical refractive lenses.
Spherical lens with no astigmatism
The ideal version of the common spherical lens, of which a typical magnifying glass is an example, exhibits no astigmatism. The lens is symmetric in the horizontal and vertical directions (indeed, all directions), and thus has an optical power that doesn’t vary depending on whether the angle that light strikes the lens is
