Presentation is loading. Please wait.

Presentation is loading. Please wait.

Networked Information Resources Online Retrieval.

Similar presentations


Presentation on theme: "Networked Information Resources Online Retrieval."— Presentation transcript:

1 Networked Information Resources Online Retrieval

2 Cognitive authority and IR Two kinds of bibliographic control (Patrick Wilson) Describing vs. Exploiting Hints of authority (Human information behavior) Rational calculation or blind faith

3 A taxonomy of web searches Navigational queries  To reach a particular site  ‘Known item’ search Informational queries  To acquire some information assumed to be present on one or more web pages Transactional queries  To perform some web-mediated activity

4 Alexa: web navigation and review Alexa Website traffic data/ranking Position in directory User-review History (Wayback Machine)Wayback Machine Community (sites link here; related links; also visit)

5 Word and phrase search Keyword search Phrase search Library evaluation “Library evaluation”

6 Boolean search Combines search terms according to Boolean logic: AND, OR, NOT The more search terms are ANDed, the more restricted, or specific, will be the search. (terms are by default ANDed with Google) OR operator broadens the search NOT operator specify terms you do not want to occur in the retrieved records. (Use “-” for NOT when searching Google)

7 Nesting Boolean operators Hate crimes (gays OR homosexuals) (Digital OR virtual OR Internet OR web) +museum -library

8 Truncation Search different forms of a word having the same common root A “recall” enhancing device Not supported by all search engines; Automatically done with Google Librar*

9 Proximity search Allow user to specify the distance between two search terms in the retrieved results. e.g. library NEAR evaluation (with AltaVista)

10 Forced stop words Search engines automatically exclude common words in their indexesautomatically exclude common words in their indexes e.g. OVID stopwords listOVID stopwords list To force stop words to be matched, use “+” Ode +to Joy “Ode to joy”

11 Synonym searches ~food matches recipes, nutrition, cooking ~facts matches information, statistics ~help matches guide, tutorial, FAQ, manual

12 Field or meta tag search Intitle: Inurl: Site: Intext: Inanchor:

13 Field or meta tag search (cont.) Link: Daterange: Filetype: Related: Info: &restrict=countryTW

14 Field search One-child law OR policy people’s OR peoples “republic of china” "one child policy” inurl:org Intitle: “national park” inurl:org lung cancer OR neoplasm inurl:gov site:www.lib.ntu.edu.tw buddhism


Download ppt "Networked Information Resources Online Retrieval."

Similar presentations


Ads by Google