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Information Retrieval

“ Effective Information retrieval in Health sciences using Internet” Your Presenter S.N.Ragu Kumar., M.Sc., M.Phil., M.Tech., MBA., Systems Analyst, Computer Facility, & Adjunct Faculty, CMET, AIIMS . Information Retrieval . Information retrieval from personal computer storage

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Information Retrieval

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  1. “Effective Information retrieval in Health sciences using Internet” Your PresenterS.N.Ragu Kumar., M.Sc., M.Phil., M.Tech., MBA.,Systems Analyst, Computer Facility, &Adjunct Faculty, CMET, AIIMS.

  2. Information Retrieval Information retrieval from personal computer storage File, folders, disk drives, USB storage etc., Google/MSN desktop search Picasa image managers Information retrieval from Internet

  3. Information Retrieval Problem of Plenty on Net. Without a proper strategy, you would lost in the sea of Information. Choose the most appropriate place to look Develop an effective search strategy Carry out the search Critically evaluate the results obtained

  4. General Information Web Search Engines / General Web Resources Journal References Databases like PubMed / IndMED etc) / Scholar Google Full Text Articles Free Open Access. Fee Based – From Libraries. Best Practices / Evidence Based Medicine Cochrane Library , Map of Medicine Appropriate Place? Will depend on what you are looking for !!!

  5. E-library E-Resources databases Information Sources & Tools Research topic: A study on biostatistics and survival analysis Know what you want … and use the right tools to search for materials. Identify which is primary sources? Which is secondary sources? Books/ Book chapters Journals Theses- PhD, research Conference papers Multimedia items CD-ROM Journal articles Foreign theses Newspapers articles Conference papers

  6. Search & Reference Tools

  7. Search Tools on the Web • Search engines • Search directories • Meta search engines • Image search engines • Meta image search engines • Dictionaries • Meta dictionaries • Thesauri • Encyclopaedias Close familiarity with each of these facilities will greatly assist you when searching for resources on the Web

  8. Web Search Facts • An estimated 73% of the Web is in English • Many search engines are also directories • Some directories are also meta search engines • The Open Directory has 64,000 editors and about 590,000 search categories! • However, directories typically have much smaller databases than search engines • No search tool is able to search the entire Web, though some meta search engines go to the Deep Net, Dark Web or Invisible Web! • Google is the most popular search engine

  9. Google • Google is the undisputed leader in search engines, with the largest database and highly relevant results • Uses an algorithm based on site popularity • The more inbound links pointing to a particular site from another site Google thinks is worthwhile, then that site will receive a higher page rank in the results • Wary of minimising advertising - no frills design, nice clean look and no pop-up ads

  10. Did you know? Most search engines... • are actually user-friendly and all you need is a little bit of time... • have a ‘preferences’ tab that customises current and future visits • have an ‘advanced’ tab that helps narrow your search query • have help pages if you’re a newbie! • Allow you to use quotation marks and ‘+’ or ‘-’ signs in your search query for better results

  11. Subject Guides Web pages of collections of hypertext links on a subject. Compiled by "expert" subject specialists, agencies, associations, and hobbyists.

  12. iBoogie

  13. AltaVista Language Translation

  14. What is a search strategy? Your search strategy is your plan of action • It helps you find the information you need to complete your assignments. • It makes you think about your project. • It helps you work out what information you need, and how you're going to find it.

  15. What do I do first? • Look at your project title and make sure you understand it. • If you are unsure of any of the words, use a dictionary If you are not in the Library you can use an online reference service: www.NMLermed.in

  16. Now identify your keywords • As an example, look at your project title: • Select the important word(s) to look at • Think of as many words as you can related to these terms

  17. What type of information do you need? • an overview on the topic so you can identify key issues? • statistical data to back up your arguments? • a definition so you understand your main concept? • a review of recent debates? • the latest research?

  18. What literature should you review? 1. Journalarticles: these are good, especially for up-to-date information. They are frequently used in literature reviews because they offer a relatively concise, up-to-date format for research. • Depending on the publication, these materials may be refereed or non-refereed materials.

  19. What literature should you review? 2. Books:  remember that books tend to be less up-to-date, as it takes longer for a book to be published than for a journal article. • They are still likely to be useful for including in your literature review as they offer a good starting point from which to find more detailed and up-to-date sources of information. 

  20. What literature should you review? 3. Conferenceproceedings: these can be useful in providing the latest research, or research that has not been published. • They are also helpful in providing information about people in different research areas, and so can be helpful in tracking down other work by the same researchers.

  21. What literature should you review? 4. Government/corporate reports: many government departments and corporations commission or carry out research. Their published findings can provide a useful source of information, depending on your field of study.

  22. What literature should you review? 5. Newspapers: since newspapers are generally intended for a general (not specialised) audience, the information they provide will be of very limited use for your literature review. • Newspapers are more helpful as providers of information about recent trends, discoveries or changes, e.g. announcing changes in government policy. • Newspapers do not give unbiased opinions.

  23. What literature should you review? 6. Thesesand dissertations: these can be useful sources of information. However there are disadvantages: • they can be difficult to obtain since they are not published, but are generally only available from the library or interlibrary loan • the student who carried out the research may not be an experienced researcher and therefore you might have to treat their findings with more caution than published research.

  24. What literature should you review? 7. Internet: the fastest-growing source of information is on the Internet. • bear in mind that anyone can post information on the Internet so the quality may not be reliable • the information you find may be intended for a general audience and so not be suitable for inclusion in your literature review (information for a general audience is usually less detailed)

  25. Search options Always check HELP option in each database for • Boolean operators • proximity operators • wildcard & truncation • limit searching

  26. Overview of Boolean Searching

  27. Get materials from other Libraries N Retrieve materials in: print electronic Y Enough information? N Consult - Supervisor/tutor - Librarian Y Research Tips NMLermed.in START Form search statement: Use synonyms to expand search terms, Use Boolean operators to refine your search statement Know what you want: e.g. Article> journal>e-journal>database Book chapter> book>e-book Conference papers> database Use the right tools to search for materials: Library or E-resources? Use citations found to get more readings List concepts in topic: Draft a brief title for your research Primary sources? Secondary sources? Currency of the information? Cite references, writing assignment END

  28. Evaluating the search results

  29. Evaluating Your Web Search Results Each page should be examined and the following questions answered: Who? Who is the authoring agency or individual? What? What is the author's credentials? Where? Where is the author's affiliation? When? When was the page last updated Why? Why is the page in existence? What is the author's purpose? How? How does the page appear?

  30. Scholarly Information

  31. Bibliographic Databases Cover Peer Reviewed Literature. Journals are selected after quality checks. References along with abstracts are available sometimes links to free full text of articles. Require familiarization on searching. Knowledge of Boolean Operators; Medical Subject Headings (MeSH) and Qualifiers are required for advanced searching.

  32. http://pubmed.gov • Includes MEDLINE® (Medical Literature Analysis and Retrieval System Online) is the U.S. National Library of Medicine's® (NLM) premier bibliographic database that contains over 16 million references to journal articles in life sciences with a concentration on biomedicine. A distinctive feature of MEDLINE is that the records are indexed with NLM's Medical Subject Headings (MeSH®).

  33. Google Scholar  "Google Scholar uses Google search technology to search for scholarly materials such as: peer-reviewed papers, theses, books, abstracts and articles and more. Results come from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations. Some of the literature will be freely found on the Web, while some links will offer the full-text of articles for payment." http://scholar.google.com

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