An Introduction to Search Engines and Web Navigation by Mark Levene

By Mark Levene

This publication is a moment variation, up-to-date and accelerated to explain the applied sciences that support us locate info at the web.  se's and internet navigation instruments became ubiquitous in our daily use of the net as a data resource, a device for advertisement transactions and a social computing device. furthermore, in the course of the cellular internet now we have entry to the web's providers once we are at the move.  This e-book demystifies the instruments that we use while interacting with the net, and offers the reader a close evaluation of the place we're and the place we're moving into phrases of seek engine and internet navigation applied sciences.

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5% of the crawled portion of the Web. 5% of the crawled pages. Pages in the left bow might be either new pages that have not yet been linked to, or older web pages that have not become popular enough to become part of the SCC. 5% of the crawled pages. Pages in the right bow might be pages in e-commerce sites that have a policy not to link to other sites. 5% of the crawled portion of the Web, and further “disconnected” components whose total size was about 8% of the crawl. A web page in Tubes has a directed path from IN to OUT bypassing the SCC, and a page in Tendrils can either be reached from IN or leads into OUT.

This estimate does not include deep web data contained in databases, which are not directly accessible to search engines [76]. As an example, patent databases such as those provided by the US patent and trademark office,6 are only accessible through a tailored search interface. 7 It is estimated that the deep web (also known as the hidden or invisible web 8 ) is approximately 550 times larger than the information that can be accessed directly through web pages. Other types of web data, which are ephemeral in nature such as train timetables (which may last months or years) and travel bargains (which normally last only weeks), or contain complex formats such as audio and video, are problematic for search engines and although not invisible, are difficult to deal with.

A survey conducted by Roper Starch Worldwide in mid200031 concluded that it takes on an average 12 min of web searching before the onset of search rage when users get extremely frustrated and lose their temper. A more recent survey commissioned in the United Kingdom by the Abbey National during the beginning of 200232 confirmed the previous survey showing a discernible gap between our expectations and the actual experience when surfing the Web. Apparently half of web surfers lose their temper once a week when surfing the Web, leading to extreme behavior such as the frustrated IT manager who smashed up an expensive laptop after a web page failed to recognize his personal details after six attempts.

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