Dear Pawan ji,
You did a very good effort and explain the topic in an easy way.
Hope it will be helpful to every library professionals
I also searched on the same topic and get some similar articles, but
your explanation is best among them
Thanking you
With best regards,
Ram Laut Tyagi
Information Resource,
Intas Biopharmaceuticals Ltd.,
423/P/A/GIDC, Sarkhej Bavla Highway,
Moraiya, Ahmedabad, Gujarat-382210 (India)
Phone: +912717660100, Etn.246
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Today's Topics:
1. Students Seminar (drtc@isibang.ac.in)
2. Full explanation: ?Half-Life? in the context of library
materials. How is it calculated? (Pawan Agrawal)
3. Indian IRs which are not listed in ROAR (Shivraj Thorat)
4. Vacancy for the post of libraria (js vijaya)
5. Re: Are we able to maintain the quality of International
Conference in LIS? (library)
----------------------------------------------------------------------
Message: 1
Date: Wed, 29 Dec 2010 14:52:01 +0530
From: drtc@isibang.ac.in
To: lis-forum@ncsi.iisc.ernet.in
Subject: [LIS-Forum] Students Seminar
Message-ID:
<1ecf2e7a41a76eda84726eefec8dd223.squirrel@mail.isibang.ac.in>
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INDIAN STATISTICAL INSTITUTE
Documentation Research and Training Centre
8th Mile Mysore Road Bangalore ? 560059
Seminar on
Search Engines: A Comparative Study
Abstract: We are living in the age of information explosion. Mainly
electronic environment and WWW is responsible for this information
explosion. In the present situation, to get right information at right
time from this heap of information, is very tedious job. To do the job a
little
easier search engine came into existence. Today information seekers are
heavily dependent on these search engines to satisfy their information
need. But the problem is, their are several search engines present and
most of users do not know how to use them effectively. In this seminar
we
will discuss on different types of search engine and their working in
general, also we will throw some light on the features of good search
engine. At last we will try to compare some of todays popular search
engines based on certain characteristics.
Student Presenter : Sudipta Biswas
Venue : DRTC Classroom
Date : 30/12/2010
Time : 2:00 pm
All are cordially invited
Devika P. Madalli
Seminar Co-ordinator
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Message: 2
Date: Wed, 29 Dec 2010 17:18:03 +0530
From: Pawan Agrawal
To: elibrarian , mlosc
, libtech@yahoogroups.com,
adinetyuva@googlegroups.com, LIS-Forum
,
lislforum@gmail.com
Subject: [LIS-Forum] Full explanation: ?Half-Life? in the context of
library materials. How is it calculated?
Message-ID:
Content-Type: text/plain; charset="utf-8"
Dear library Professionals,
You must have remember about a question asked in UGC NET exam last
Sunday.
We were asked a question about *half life in context of library material
and
its calculation*. As per the question it's indication was about library
material and in that case we can not exclude books half life. I have
browsed
a lot on this question and received a lot on citation only. cited half
life,
citing half life, citation half life etc. which was covering only
journal or
periodicals half life. There was almost nothing on books or other
library
material. Some how I could get some hints of it and I though I must
share it
with all of you. I have prepared a short answer of this question which I
feel would be useful for you.
*Half life concept in Bibliometrics*
Half life is a method though to be practical for evaluating the
usefulness
of specific library material examines citation half life (for journals)
and
use half life (for books and other material). Half life studies attempt
to
evaluate the length of time in which a journal or book is used, either
as
resources as indicated by citation, or physical use as indicated by
circulation (books). Tsay (1998) examines journal or book ?life? based
on
uses as demonstrated by citation or circulation. The premises ?half
life? in
bibliometrics is to determine when half of all the active literature of
a
field has been published, or the time period that includes half of more
of
the references made. Short half life, whether citation based or use
based
which means more than 50% of the use or the citations occurred in a
short
period of time, implies ?new volumes of a title are generally used more
often than older volumes?. Half life studies may suggest which library
resources are most used, but may also exaggerate use in that there are
more
publications now than previously. There have been suggestions that half
life
studies could identify which resources are least used, resulting in a
list
of items for considered for discontinuation of write off. Caution
should be
taken in applying such a plan; the mission of the institution, the
orientation and the behavior of the users, and any possible other
contributors to low use, such as inaccessibility, should be considered.
1995(9 citation or no item issued in a year)
1996 (6)
1997(7)
1998(6)
1999(7)
2000(7)
2001(7)
2002(3)
2003(7)
2004(5)
2005(7)
2006(2)
2007(5)
2008(2)
2009(2)
2010 (1)
*Half life on the basis of Citation:* This can be achieved by
subtracting
the publication year of the source documents from the median publication
year of the documents that cite the source document. We take an example
of
the data given above. Here, in this example citation data is given for a
certain article which was published in 1994. In the table above the
account
of the citation received by the article from 1995 to 2010 is given.
Total
number of documents citing this article in period of 16 years is 83. It
is
also possible that total 83 documents are published during this period
on
the subject of the article published in 1994. Now If we take out median
of
the publication date of citing documents it will come 42, which is
received
in year 2000. Then, 2000 minus 1994 equals six years. So the half life
of
the article published in 1994 would be of 6 years.
*Half life on the basis of circulation: *This can be achieved by
subtracting
the acquisition year of the source item from the median of issue years
of
the document. We can take an example again of the data given above. A
resource acquired by a library in the year 1995. The statistics given
above
are of the circulation in the period of 16 years. Total number of issue
of
this book in period of 16 year is 83 and the median as similar of the
above
example comes 42, which is achieved in year 2000. Then, 2000 minus 1995
equals five year. So the half life of the item received in 1995 would be
of
5 years.
Comments are welcome
--
Join hands, Join eLibrarian
www.grou.ps/elibrarian
Thanks and Regards
------
*Pawan R. Agrawal
*Librarian
Takshshila Centre for Learning
Transpek Silox Industry Ltd.
Kalali Road- Atladra
Vadodara- 390012
Ph. 9376135580
http:\\www.grou.ps/elibrarian
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