Internet Resources

Internet resources retrieval : Search Engines ,OPAC & WebOPAC, and retrieval techniques

DR NIRMAL KUMAR SWAIN Associate Professor

Dept of Lib. & Inf. Science Maharshi Dayanand University

Rohtak – 124001

May 3, 20231 NIRMAL KUMAR SWAIN

Internet resources retrieval : Search Engines ,OPAC & WebOPAC, and retrieval techniques

Lecture delivered At Training for Teacher Educators of Western Region on

Technique of Using Digital Libraries , Feb 17-21, 2017

Regional Institute of Education (RIE), NCERTBhopal

Feb 17, 2017


Topics to be discussed

Library as an Information System Internet as massive source of

information Collected , arranged and processed

hosted in and by Search Engines Information arranged in its own way not

known to the users May 3, 20233 NIRMAL KUMAR SWAIN

Topics to be discussed …

Concept of OPACConcept of WebOPACSearch EnginesInternet simplied


Cont …

The users search and retrieve his own information

Sometimes at instant success, late or slow success, partially success and even no success or failure

Develop his own experience or gets training to search and retrieved desired information


Story speaks different story

Information is gathered in a specific way, collected, and processed with definitive tagging by the search engines

Sometimes the desired information and found and retrieved but very late and after trying hard, which consumes time.


Subject tagging

Each information available in the Internet is tagged in some way or with use of certain techniques so that people can search by the same term and retrieve the information.


Key words

Difficult to know certain key words under which the subjects are tagged. Still with experience someone can develop a consensus over the use of search term. The search terms can not be full tamed. The search engines use hyperlink to take the users to different locations.


Search techniques matters

Even with the use of search terms techniques matters. What exactly the users want. There are many search techniques. Most popular is Boolean model which use AND, NOT, OR for searching the Internet.


Boolean

AND (narrows the search by retrieving only records containing both keywords used in the search statement)

OR (broadens your search by retrieving either one or more of the keywords used in the search statement)

NOT (excludes records containing the second keyword in your search statement)


The AND operator

AND links terms together in a way that makes your search more narrow. It tells the computer that you want records that contain all the words you specify.

For instance, if you search only records containing the words “dog” and “cat,” your results will return only those articles containing BOTH terms.


AND


The OR operator

OR broadens, or widens, your results. For instance, a search on dog or cat will

give you records that not only have both dog and cat in them, but also the records that contain only dog and only cat.

Therefore, you will obtain more results by using the OR operator.


OR

The purple space represents all the records that would be returned by the search "dog or cat."


NOT

The purple spaces represent all the records that would be returned by the search "dog not cat," and "cat not dog.” Note that “dog not cat” gives much different results that “cat not dog.”


THANK YOU

THANK YOU
