16
International Atomic Energy Agency INIS Training Seminar INIS Training Seminar Principles of Principles of Information Retrieval and Query Information Retrieval and Query Formulation Formulation 07 – 11 October 2013 Vienna, Austria Bekele Negeri INIS Unit Nuclear Information Specialist

International Atomic Energy Agency INIS Training Seminar Principles of Information Retrieval and Query Formulation 07 – 11 October 2013 Vienna, Austria

Embed Size (px)

Citation preview

International Atomic Energy Agency

INIS Training SeminarINIS Training Seminar

Principles of Principles of

Information Retrieval and Query Information Retrieval and Query FormulationFormulation

07 – 11 October 2013

Vienna, Austria

Bekele NegeriINIS Unit

Nuclear Information Specialist

International Atomic Energy Agency

OutlineOutline

• Databases (Textual) types

• Planning searches

• Formulating queries

• Measure of Search effectiveness

• Using search results and queries

October 2013 INIS Training Seminar 2

International Atomic Energy Agency

Databases (textual)Databases (textual)

• Databases consist of data (records) described in fields and a means by which to search these fields, a search engine.

• Databases may look different on screen but the underlying principles for searching and formulating search strategies are common to all.

October 2013 INIS Training Seminar 3

International Atomic Energy Agency

Bibliographic Databases (Types)Bibliographic Databases (Types)

• Bibliographic Databases: provide only citation or reference author(s), title, subject(s) and publisher..) and with this information you should be able to locate the item in the Library.

• Bibliographic with some full text content: these enhanced databases include keywords and abstracts and often, but not always, include the full text of an article.

• Bibliographic databases with full text content: these databases include the entire full text for all articles and other documents indexed.

October 2013 INIS Training Seminar 4

International Atomic Energy Agency

Planning your searchPlanning your search

• “Understanding the Problem is Half of the Solution”

• Define precisely the information you are seeking

• Identify the concepts that represent the problem

October 2013 INIS Training Seminar 5

International Atomic Energy AgencyOctober 2013 INIS Training Seminar 6

Planning a search: examplePlanning a search: example

Risk of medical radiation exposure?

• To whom: to patients or doctors and medical technicians?

• If to patients: are you concerned about exposure due to radiodiagnostics (CT, X-ray..) or due to radiation therapy or both?

• If radiotherapy: are you concerned about radionuclide therapy or external irradiation therapy?

• If about personnel: are you interested about safety policy of medical establishements?

International Atomic Energy Agency

Planning your search (Cont’d)Planning your search (Cont’d)

• Topic: Risk of radiation exposure of medical staff in a radiotherapy department

• Concepts:

• Exposure to radiation

• Medical staff

• Radiotherapy

• Are we looking for documents• In certain language, from certain country..

• Latest publications

• Only records with full text documents, or journal citations..?

October 2013 INIS Training Seminar 7

International Atomic Energy Agency

IINIS Database FieldsIINIS Database Fields

• Numerical (Exact or Range search)• Year of publication (PY)

• Reference Number (RN)

• Free Text• Title (TI) Authors (AU)

• Source (SO) Abstract (AB)

• Controlled Vocabulary

• Language (LA)

• Country of Input (CO)

• Descriptors (DE)• Indexer-assigned descriptors (DEI)

• Computer-upposted descriptors (DEC)

October 2013 INIS Training Seminar 8

International Atomic Energy Agency

Search StrategySearch Strategy

• Simple search

• single search term or phrase• “Oncology” , “nuclear safety”

• Advanced search (combining concepts)• Boolean Operators: OR, AND, NOT

• Text Operators

any (includes any), all (includes all), exact phrase

• Numeric Operators

equal, more, less, more or equal, less or equal

• Truncation, Wildcard

• Multilingual Search

October 2013 INIS Training Seminar 9

International Atomic Energy AgencyOctober 2013 INIS Training Seminar 10

Query Syntax Query Syntax Google Search ApplianceGoogle Search Appliance

International Atomic Energy Agency

Query FormulationQuery Formulation

• Translating your search concepts into proper search syntax

• For the Topic: Risk of radiation exposure of medical staff in a radiotherapy department• Simple to complex

• MEDICAL PERSONNEL (is a BT for RADIOLOGICAL PERSONNEL)

• OCCUPATIONAL EXPOSURE or OCCUPATIONAL SAFETY or RADIATION PROTECTION

• RADIOTHERAPY

• Try to search for individual terms and explore the database; you may identify other key concepts like radiation doses, ALARA, dose limits…

• Then combine them using boolean operators (and, or, not)

• Some databases allow you to combine searches while others allow you to combine your results during selection of records

October 2013 INIS Training Seminar 11

International Atomic Energy Agency

Measuring Search EffectivenessMeasuring Search Effectiveness

• Precision & Recall

• Recall: the ratio of the number of relevant records retrieved to the total number of relevant records in the database.

October 2013 INIS Training Seminar 12

International Atomic Energy Agency

• Precision: the ratio of the number of

relevant records retrieved to the total

number of irrelevant and relevant records

retrieved.

• Precision and recall are

Inversely relatedHigh recall = comprehensive retrieval

but high noise

High Precision = only relevant records

but miss out good records

Source: http://www.creighton.edu/fileadmin/user/HSL/docs/ref/Searching_-_Recall_Precision.pdf

October 2013 INIS Training Seminar 13

International Atomic Energy Agency

Optimize your search strategyOptimize your search strategy

• Precision• Search in particular field

• Search in DEI (indexer assigned descriptor)

• Use exact Phrase

• Combine using “AND”

• Recall • Search across fields

• Combine synonyms, related terms, broad or general terms

• Use “any” or “all” words

• Optimise • Use your best judgment

• From simple to complex

October 2013 INIS Training Seminar 14

International Atomic Energy Agency

Using your Query and search resultsUsing your Query and search results

•Selecting relevant records• select format (pdf/ html/excel..)

• Printing/saving

• Email search results

•Storing query• Save and run query

• Subscribe Feeds

October 2013 INIS Training Seminar 15

International Atomic Energy Agency

Thank you!Thank you!

October 2013 INIS Training Seminar 16