Dr. Ali M. Hadianfard Paramedical School, AJUMS .
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Transcript of Dr. Ali M. Hadianfard Paramedical School, AJUMS .
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Dr. Ali M. Hadianfard Paramedical School, AJUMS
http://www.alihadianfard.info/download.html
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The Internet is a vast sea of information. some of it is useful, relevant, authoritative, and some of it is not. That is why “Surfing” the World wide web requires knowledge and skill.
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INFORMATION OVERLOAD!
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There’s too much Information here!
Why I’m getting these results!?
How can Imake my search morespecific?
Most of the documents Iretrieve aren’trelevant to myquery.
How can I search better and get
quality information?
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WE SHOULD IMPROVE THE WAY OF
SEARCHING ON THE INTERNET
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FOUR TECHNIQUES
Focus your subject clearly
Use Meta- search engines
Use Advanced features
Use Directories
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which subject is the best subject for searching?
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QUERIES
Queries are the combination of keywords and operators that we enter into the search box of search engines.Example:computer + “clinical decision support systems”
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OR: terms on either side of this operator are sufficient to be scored as a result.
AND (+): terms on both sides of this operator must be present somewhere in the document in order to be scored as a result.
NOT (-): documents containing the term after this operator are rejected from the results set.
NEAR: similar to and, only both terms have to be within a specified word distance from one another in order to be scored as a result.
THE OPERATORS AND SYNTAX IN BOOLEAN SEARCHING
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Phrases (“”): combined words or terms that must appear directly adjacent (exact) to one another and in the phrase order for the source document to be scored as a result.
Parentheses: nested operators that are evaluated in an inside-out order of precedence.
Wildcards (*,?): beginning characters (stemming) that must match the same beginning characters in a document's words in order to be scored.
…CONTINUE
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SOME EXAMPLES Use of Boolean Operators: AND, OR, NOT, NEAR
diabetes AND mellitus cancer OR tumor diabetes NOT insipidus Application NEAR “multimedia patient record”
Use of phrase and parentheses “medical device failure” (“acute heart disease” +ischemic) OR (“chronic heart
disease” AND hypertension) (diabetes AND mellitus) -complication
Use of truncation Cardio* cardiovascular, cardiothoracic,…
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EXAMPLES OF SEARCH ENGINES
http://www.altavista.com
http://www.lycos.com
http://www.hotbot.com
http://www.bing.com
http://search.yahoo.com
http://www.google.com
http://www.ask.com
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SEARCH ENGINES ARE GOOD FOR...
Finding a lots of information.
Addressing a fairly specific
information.
Searching a specific type of
information such as images
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SOME POPULAR META-SEARCH ENGINES
Mamma http://www.mamma.com
IxQuick http://www.ixquick.com
Excite http://www.excite.com
Metacrawler
http://www.metacrawler.com
Dogpile http://www.dogpile.com
Search http://www.search.com
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DIRECTORIES
Search directories operate based on a subject classification scheme or taxonomy. Also is named Subject index
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SUBJECT INDEXES ARE GOOD FOR..
Accessing to quality information.
Addressing more general information.
obtaining a general overview of what’s available
for a particular subject area.
Organising information more effectively.
information sources are categorised according to
their content
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EXAMPLES OF SUBJECT DIRECTORIES
http://www.dmoz.org
http://www.about.com
http://directory.yahoo.com
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Getting to the right level
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THANK YOU