MDST*1010 Lecture Notes - Lecture 3: Canadian Internet Registration Authority, Whois, Boolean Algebra
Internet Research Strategies By: Dave McKie
Getting Deep Inside the Web
-Search Engines: use plain, natural language. This results in your questions being
more elaborate, which leads to more accurate, concise results.
-Boolean Logic: A lot of search engines let you use Boolean logic in order to
narrow and enlarge your searches w/ the terms 'AND,' 'OR,’ and 'NOT'. Key
operators can be used together to narrow your search even further.
-For example, if you're researching books published by Canadian authors,
you’d want to search ‘authors AND Canadian' so that all of the results
shown contain both words.
-By searching 'cancer OR chemotherapy', your results would include sites
that contain the words 'cancer' or 'chemotherapy' or both words 'cancer
and chemotherapy’.
-If you want to research droughts, but you don't want any results about the
drought in California, you would search 'droughts NOT California'.
-Another Boolean feature is called 'The Wild Card' which is represented by the
asterisk (*). The asterisk stands for multiple characters, allowing you to search
for words with similar spellings. For example, if you want to research Canada you
could use “Canad*” so that your results include both “Canadian” and “Canada.”
Catalogue Search Engines
-Also known as a “dictionary search engine” or a “hierarchical” index.
-Search engines are put together by humans and rated by experts: Yahoo! and
Looksmart.
-Different from the robots used by the keyword search engines such as Google,
where an “index” of websites and pages is compiled automatically by robots that
use a variety of criteria to rank sites.
Meta Search Engines: obtains results from two or more other search engines, instead of
its own efforts.
Keyword Search Engines
-Uses automated technology to browse the web for new pages.
-For example, when using a keyword search engine such as Google you are
perusing its index, not the web.
-A keyword search is similar to index page of book, which is where a person finds
a term they’re interested in and the index tells them which page to go to.
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Document Summary
This results in your questions being more elaborate, which leads to more accurate, concise results. Boolean logic: a lot of search engines let you use boolean logic in order to narrow and enlarge your searches w/ the terms "and," "or," and "not". Key operators can be used together to narrow your search even further. For example, if you"re researching books published by canadian authors, you"d want to search authors and canadian" so that all of the results shown contain both words. By searching "cancer or chemotherapy", your results would include sites that contain the words "cancer" or "chemotherapy" or both words "cancer and chemotherapy". If you want to research droughts, but you don"t want any results about the drought in california, you would search "droughts not california". Another boolean feature is called "the wild card" which is represented by the asterisk (*). The asterisk stands for multiple characters, allowing you to search for words with similar spellings.
