Read e-book online An Introduction to Search Engines and Web Navigation PDF

By Mark Levene

This ebook is a moment variation, up to date and accelerated to explain the applied sciences that aid us locate info at the web.  se's and internet navigation instruments became ubiquitous in our day after day use of the net as a data resource, a device for advertisement transactions and a social computing device. in addition, during the cellular net we now have entry to the web's providers once we are at the move.  This booklet demystifies the instruments that we use whilst interacting with the net, and offers the reader an in depth review of the place we're and the place we're entering into phrases of seek engine and internet navigation applied sciences.

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Thirdly, whatever the query may be, some of its results may not be home pages and some of the pages may be duplicated in the answer set, so it is almost impossible for the search engine to count the number we require. The structure of a relational database does not change rapidly after the initial database design. So, for example, think of the massive database sitting in a bank storing all its customers’ details, and all of the software that has been written for the applications that query the database.

4 Problems with Web Information Seeking There are several problems with information seeking on the Web. First, the Web is an open system which is in constant flux: new sites appear, old ones change or disappear, and in general the content is emergent rather than planned. This implies that results are not stable and that users may need to vary their strategy over time to satisfy similar needs. Secondly, the quality of information on the Web is extremely variable and the user has to make a judgment.

Then we can deduce that the 100 fish are in the same proportion relative to the whole population, that is they are 1% of the total population. So, our estimate of the number of fish in the lake in this case will be 10,000. Using this method, Lawrence and Giles defined the following experiment with pairs of search engines to estimate the size of the Web. To start with, they tagged all the pages indexed by the first search engine as were the fish. They then chose several typical queries (575 to be precise) and counted the number of unique hits from the first search engine in the pair; that is, they counted the number of web pages returned from the first search engine.

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An Introduction to Search Engines and Web Navigation by Mark Levene

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