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Search Engines

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Information about Search Engines
Education

Published on April 20, 2009

Author: plectrum

Source: authorstream.com

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Slide 1: Web Location Services Slide 2: GOPHER Late 80's Historical Background Slide 3: GOPHER Historical Background A Gopher Application software Slide 4: Historical Background Wide Area Information Servers W.A.I.S. Slide 5: Wide Area Information Servers The primitive XWAIS Historical Background W.A.I.S. Slide 6: Wide Area Information Servers An improved user interface Historical Background W.A.I.S. Slide 7: Wide Area Information Servers Historical Background W.A.I.S. The Windows version Slide 8: Web Location Services Search Engine Catalogue Slide 9: A proper search engine Slide 10: An example of a catalogue Yahoo actually uses Google for its search engine! Slide 11: More of a complete front end for the internet than just a search engine! MSN is another such site Slide 12: How they work. In a nutshell Slide 13: Privacy and security Privacy and security Privacy and security Privacy and security Privacy and security Privacy and security Privacy and security Slide 14: Meta Tags …allow the owner of the page to specify key words and concepts under which the page will be indexed. Slide 15: Complex searches ? And: All the terms joined by “AND” must appear in the pages or documents. Some search engines substitute the operator “+” for the word AND ? OR: At least one of the terms joined by “OR” must appear in the pages or documents ? NOT: The term or terms followed by “NOT” must not appear in the pages or documents. Some search engines substitute the operator “-” for the word NOT ? Followed by: One of the terms must be directly followed by the other Slide 16: Complex searches ? Near: One of the terms must be directly followed by the other. ? Quotation marks: Words between quotation marks are treated as a phrase, and that phrase must be found within the document or file. Slide 17: Site search engines Search engines that return results from a particular website only Usually created by programs that generate a Java Script code One such program is SearchMaker Pro Slide 18: Site search engines Slide 19: Sample code generated by SearchMaker Pro Slide 20: Site search engines Webmaster utility sites like Bravenet.com and Cgispy.com offer their services to create a site search engine…for free. Slide 21: Searching Tips If there isn't a specialized search engine, try Yahoo. Sometimes you'll find a matching subject category or two and that's all you'll need. If Yahoo doesn't turn up anything, try AltaVista, Google, Hotbot, Lycos, and perhaps other search engines for their results. Depending on how important the search is, you usually don't need to go below the first 20 entries on each. For efficiency, consider using a ferret that will use a number of search engines simultaneously for you. Slide 22: Searching Tips Slide 23: If you feel it's necessary, also search the Usenet newsgroups. As you continue to search, keep rethinking your search arguments. What new approaches could you use? What are some related subjects to search for that might lead you to the one you really want? Searching Tips At this point, if you haven't found what you need, consider using the subject directory approach to searching. Look at Yahoo or someone else's structured organization of subject categories and see if you can narrow down a category your term or phrase is likely to be in. If nothing else, this may give you ideas for new search phrases. Slide 25: Hell-bent in indexing anything and everything! Over 30 million pages indexed! (until July 96) http://www.altavista.com Slide 26: Claims to have indexed even more pages than Alta Vista http://www.excite.com Slide 27: Indexes the full text of less than a million pages (until May 96), but stores more URL’s http://www.opentext.com Slide 28: Claims that it can grow with the web and index it entirely no matter how big! http://www.hotbot.com Slide 29: Uses multiple spiders – up to 4 at a time! At peak performance the system could crawl over 100 pages per second generating around 600 kilobytes of data per second! http://www.google.com Slide 30: It is simply an online game using Google! The contestant types two words in Google and hopes to receive ONE result only. When this happens it is called a Pure Whack. The contestant can then submit it to www.googlewhack.com where it will be posted. One such Pure Whack is the result of the search for “ambidextrous scallywags”! http://www.googlewhack.com Slide 31: First Seach Engine! Slide 32: The End Slide 33: Definition A Search Engine proper is a database and the tools to generate that database and search it. Slide 34: Definition A Catalogue is an organisational method and a related database, plus tools for generating it.

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