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Search Engines

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Supichaya Nuntapunt …

Supichaya Nuntapunt
Search Engines
for Mae Fah Luang University
Freshmen 2010 Live & Learn

Published in: Technology

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  • Go through these procedures fairly quickly: there’s an exercise to learn this You want them to be able to understand the form and what it says. DOMAIN APPROPRIATE FOR THE CONTENT: Do you trust a NYT times article from a personal page as much as one from nytimes.com? A copy of Jackie Onassis’s will from a personal page as much as one from the California Bar Assn.? Example of a personal page would be: www.aol.com/~jbarker They are loosely paralleled by the sequence of the form in the next exercise.
  • You can trust the lii.org more than many referrals. If there are annotations by professionals, that helps. The burden is on you, always. Demonstrate link: search example in Google. Use http://www.hanksville.org/yucatan/mayacal.html
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    • 1. SEARCH ENGINE Live and Learn 2010 Aj. Supichaya Nuntapunt School of Information Technology Mae Fah Luang University
    • 2. The Web Defined
      • Software application that allows us to publish and browse hypertext documents
      • Transported over Internet
      • HTTP
      • Browsers are multiprotocol
      • URL = Web address
    • 3. Introduction
      • Directories, Search Engines, and Metasearch Engines
      • Search Fundamentals
      • Search Strategies
      • How Does a Search Engine Work?
    • 4. Directories, Search Engines, and Metasearch Engines
      • Directories
      • Popular Directories
      • Search Engines
      • Popular Search Engines
      • Metasearch Engines
      • Popular Metasearch Engines
    • 5.  
    • 6. Directories
      • Hierarchical representation of hyperlinks
      • Top level of general topics
      • Sublevels of more specialized subtopics
      • Easy to use
      • Not necessary to know exactly what looking for
    • 7. Popular Directories
      • AOL NetFind
      • CNET Search.com
      • Excite
      • Infoseek
      • Looksmart
      • Lycos
      • Yahoo!
      • Open Directory (dmoz.com)
    • 8. Search Engines
      • Computer program:
        • Accepts a query
        • Searches database
        • Returns URLs
        • Permits query revision
      • Problem: many times search engine return too many URLs. You need to be specific!
      • Query syntax
    • 9. Popular Search Engines
      • Google (85.35%), Yahoo(6.29%), Bing (3.27%)
      • AOL, Ask, AltaVista, Excite, HotBot, Lycos, Fast search (alltheweb.com), DogPile
      • As of December 2009
      Ross Shannon: HTML Source http://www.yourhtmlsource.com
    • 10. HitWise http://www.hitwise.com/us/datacenter/main/dashboard-10133.html
    • 11. Ranks.nl - Compare Search Engines http://www.ranks.nl/tools/compare.html
    • 12. Metasearch Engines
      • Call other search engines
      • Use single query
      • More matches
    • 13. Popular Metasearch Engines
      • Metasearch
      • Metacrawler
    • 14. Search Fundamentals
      • Search Terminology
      • Pattern Matching Queries
      • Boolean Queries
      • Search Domain
      • Search Subjects
    • 15. Search Terminology
      • Search tool
      • Query
      • Query syntax
      • Query semantics
      • Hit or Match
      • Relevancy score
    • 16. Pattern Matching Queries
      • Enter keyword(s)
      • Search engine returns URLs
    • 17. In-line/On-line: Fundamentals of the Internet and the World Wide Web
    • 18. Boolean Queries
      • George Boole
      • AND, OR, and NOT
      • Examples:
        • You want to search for bass (the fish not the musical term)
        • Vacation in either London or Paris
    • 19. Search Domain
      • Web
      • Newsgroups
      • Specialized databases
      • Library
    • 20. Search Subjects
      • Metaspy shows searches for metacrawler in realtime.
      • Google Search History
    • 21. Introduction – Choose a search engine
      • User-friendly interface
      • Documentation
      • Database size
      • Relevancy scores
    • 22. Too Many Hits: Search Specialization
      • Add keywords
      • Add AND or NOT
      • Capitalize proper nouns
      • Use first 20 URLs
    • 23. Too Few Hits: Search Generalization
      • Eliminate keywords
      • Remove AND or NOT
      • Enlarge search domain
      • General keywords
    • 24.  
    • 25. How Google works
      • BEFORE you search: “Crawls” pages on the public web Copies text & images, builds database
      • WHEN you search: Automatically ranks pages in your results
        • Word occurrence and location on page
        • Popularity - a link to a page is a vote for it
        • ~ 200 factors in all!
    • 26. Searching Google
      • Think “full text” = be specific
        • war of 1812 economic causes vs. history
      • Use academic & professional terms
        • domestic architecture vs. houses genome society gets International Mammalian Genome Society also try combinations with association , research center , institute , directory , database
    • 27. Searching Google
      • Specify exact phrases
      • “ tom bates” “what you're looking for is already inside you”
      • Exclude or require a word
        • proliferation -nuclear
        • bush legacy +environment
    • 28. Limit your search to …
      • Web page title intitle:hybrid allintitle:hybrid mileage
      • Website or domain site:whitehouse.gov “global warming” site:edu “global warming”
      • File type filetype:ppt site:edu “global warming”
    • 29. On the results page
      • Search box (use to modify)
      • “ Cache”
      • “ Related pages”
      • “ Translate this page”
    • 30. Let’s try it !
      • Search Google
      • Use our examples or your own topics
      www.google.com
    • 31. Google’s other databases
    • 32. Why go beyond Google?
      • Search more of the web Yahoo!
      • Get more options Exalead
    • 33. Let’s try it !
      • Try other search tools
      • Compare results with Google
    • 34. CRITICAL EVALUATION Why Evaluate What You Find on the Web?
      • Anyone can put up a web page
      • Many pages not updated
      • No quality control
        • most sites not “peer-reviewed”
          • less trustworthy than scholarly publications
    • 35. Before you click to view the page...
      • Look at the URL - personal page or site ? ~ or % or users or members
      • Domain name appropriate for the content ?
        • Restricted: edu, gov, mil, a few country codes (ca)
        • Unrestricted: com, org, net, most country codes (us, uk)
      • Published by an entity that makes sense ?
        • News from its source?
          • www. nytimes .com
        • Advice from valid agency?
          • www. mfu .ac.th
          • e-learning . mfu .ac.th
    • 36. Scan the perimeter of the page
      • Can you tell who wrote it ?
        • name of page author
        • organization, institution, agency you recognize
      • Credentials for the subject matter ?
        • Look for links to:
        • “ About us” “Philosophy” “Background” “Biography”
      • Is it current enough ?
        • Look for “last updated” date
    • 37. Examine the content
      • Text
          • possibly forged ?
      • Sources
          • documented with links or notes ?
          • do the links work ?
      • Evidence of bias
          • in text or sources ?
    • 38. Do some detective work
      • Search the URL in alexa.com
        • Click on “Site info for … ”
        • Who owns the domain?
        • Who links to the site?
        • What did the site look like in the past?
        • www.archive.org/web/web.php
        • (Wayback Machine)
    • 39. Does it all add up ?
      • Was the page put on the web to
        • inform ?
        • persuade ?
        • sell ?
        • as a parody or satire ?
      • Is it appropriate for your purpose?
    • 40. Try evaluating some sites...
      • Search a topic in Google
      • Scan the first two pages of results
      • Visit one or two sites
        • evaluate their quality and reliability
    • 41. Questions?
    • 42. References
        • John Kupersmith: University of California, Berkeley
        • Greenlaw/Hepp, In-line/On-line: Fundamentals of the Internet and the World Wide Web
      THANK YOU