PowerPoint Presentation On Meta Search Engines

PPT On Meta Search Engines

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Meta Search Engines Presentation Transcript:

1. CONTENTS
Working of search engine. Meta search engine. Need of meta search engine ? Working of Meta search engines Meta search engine activities Advantage and Disadvantages Meta search Algorithm Fitness Function for Web-Search

2. Working of search engine
Traditional search engines return relevant results based on complex algorithms. Their “knowledge” of the web is based on its use of Internet spiders.

3. Working of search engine
Internet spiders are programs that request a web page, parse its contents, and return the results to the search engine. As part of the parsing process, the spider identifies hyperlinks on the page. It chooses one of these hyperlinks to decide which page to parse next.

4. Examples of Search Engines
A few popular traditional search engines are: Google ( www.google.com) Ask Jeeves! ( www.ask.com) MSN Search ( www.msn.com) Lycos ( www.lycos.com)

5. Meta Search Engines
While meta-search engines do use page-ranking algorithms, they do not use spiders to gather web content. Instead, meta search engines query multiple traditional search engines and rank the hits returned from all of them. The results may be listed by the engine that returned them while others may eliminate data about which engine returned each hit altogether.

6. Meta Search Engines
Completeness of the index is not the only factor in the quality of search results. "Junk results" often wash out any results that a user is interested in. we want our notion of "relevant" to only include the very best documents since there may be tens of thousands of slightly relevant documents.

7. Meta Search Engines
Meta-search engines do not own a database of Web pages; they create a virtual database. They do not compile a physical database or catalogue of the web. Instead, they take a user's request, pass it to several other heterogeneous databases and then compile the results in a homogeneous manner based on a specific algorithm.

8. Main Metasearch Engine Activities
Source selection Which search engines to search. Employs profiles of each search engine to make decision Query dispatching. Translating a query to a local format.

9. Main Metasearch Engine Activities
Result selection. Picking from the multiple result sets. Some results lists might be pruned if they come from less relevant search engines. Result merging. Unifying/ranking the selected results. Rankings from individual lists.

10. For more please refer our PPT. Thanks.

Related Project Report:

Meta Search Engine