1 / 20

Word of the Day

Word of the Day. URL Uniform resource locator – or Web address, unique to every web page www.carpeindexum.com/libs100mw/sum05.htm. Searching and Boolean Operators. LIBS100 June 8, 2005. Web browsers:. Computer software that allows you to view WWW documents Internet Explorer (Microsoft)

herrod-acosta
Télécharger la présentation

Word of the Day

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Word of the Day URL Uniform resource locator – or Web address, unique to every web page www.carpeindexum.com/libs100mw/sum05.htm

  2. Searching and Boolean Operators LIBS100 June 8, 2005

  3. Web browsers: Computer software that allows you to view WWW documents • Internet Explorer (Microsoft) • Netscape Navigator/Communicator • Firefox review

  4. Structure of the Web • The Internet : a network of networks; computers linked together that communicate by a shared protocol (TCP/IP) • World Wide Web: data files (e.g., documents, images, videos, etc.) residing on Internet information servers (computers); mainly use HTTP protocol to transfer data

  5. Browser Basics • Address Bar- where you can input URL • Go – takes you to address you input • Home icon – pressing this takes you to your home page

  6. Browser Basics • Back – takes you back one page • Forward – brings you forward one page • Search bar – where you can input search terms

  7. Internet • Exciting place to do research • Often the first place people turn • Overwhelmingly huge • WWW contains “tens of billions” of pages • Google indexes largest number of pages • Reports over 8 billion pages indexed

  8. Google • Largest search engine • Crawler-based • Uses software called “crawlers” or “spiders” to automatically search through web pages and follows links • Highly relevant results

  9. Google • Created in 1998 by 2 Stanford students • Google is exclusively a search engine • Elegantly simple, easy to use

  10. What is a Relevant Result?? A hit that meets your informational need • “Bad results” due to: • Poorly constructed queries • Bad relevance ranking by search engines • Poorly constructed queries

  11. How does Google rank web pages?? • Location/frequency • The location of search terms on the web page • How many times search terms appeared • Link popularity (Google PageRank) - number of pages that link TO Page X boosts Page X’s ranking • Penalties for artificially inflating results

  12. Google Searches • Automatically adds AND between your terms • Ignores “stop words” the, and, of, to… • Can use other words to broaden or narrow search results Boolean Operators

  13. Boolean Logic • George Boole (1815-1864) – Mathemetician who discovered that logical reasoning can be represented in terms of mathematical formulas • Boolean Algebra – Only two conditions allowed 1=True or 0=False • Boolean Query – Search terms joined by AND, OR, NOT

  14. Boolean Operators • AND – locates records containing both terms. • OR – locates records containing either term • NOT – locates records containing first term, but not the second • In Google (and most other search engines) the operators MUST be capitalized

  15. Boolean Machine http://kathyschrock.net/rbs3k/boolean/

  16. Which query will give us the most hits? endangered (AND) birds endangered OR birds endangered NOT birds birds NOT endangered

  17. Boolean Math • AND use the + sign • NOT use the – sign • “Multiplier” enclose phrase in quotes No space between search terms and sign!

  18. Modifying Searches • Based on results list, modify your search string to get better results • Add, delete or change terms used • Use “quotation marks” to search for a phrase

  19. Work for Monday • Tyner, Ross. “Choosing and Developing a Topic.” Okanagan University College 31 Jan 2004. 3 May 2005 http://www.ouc.bc.ca/library/eil/research/topic.html . • Quiz moved to Wednesday, June 15th

  20. References • Rothenberger, Michelle. “Search Engines.” Accessed 6 Feb 2005 http://www.carpeindexum.com/libs100/srcheng/srchdir.ppt • Staff. “Resources, INFS100.” Minneapolis Community and Technical College. Accessed 6 Feb 2005 • Sullivan, Danny. “Search Features Chart.” Searchenginewatch.com 26 Oct 2001. Accessed 6 Feb 2005 http://searchenginewatch.com/facts/article.php/2155981

More Related