Download - 文献检索(信息检索) 第四章 计算机信息检索技术

Transcript
  • G252.7/160=2

  • 1.205060

  • 2.20702070DIALOGMEDLINE

  • 3.208020804.2090

  • 1.

  • 2.WebWeb3.

  • 4.MEDLINEWeb

  • 1.2.

  • 3.4.

  • 3CContent:Coverage:Currency: Cost:

  • ()

  • 1.()2. 3.4.5.6.

  • 1.ANDNOT2.3.4.5.6.7.8.9.10.

  • E-mail1.2.3.

  • 1.2.

  • andor notANDORNOTAND OT

  • access pointapproach)

  • 1.2.

  • 3. 4.5.ISSNISBN

  • 1.

  • 2.3.

  • 1.

  • 2.1Web2

  • 33.

  • 4.F22F35**

    zhang

  • 1.1234

  • 2.1234

  • 3.12Medline4.5.

  • 1.

  • 2.3.4.

  • 1.2.3.4.

  • NOTANDORAND ANDORNOT NOTANDOR

  • ANDand*AB ORor+ NOTnot-ABAB*A BA not BA + BA or BA * BA and B

  • AND* **

  • OR+ 540++608SUN OR SOLAR

  • WnWNnNLSF AND

  • WwithnWn words ndouble(W)digit() double digit double-digitLaser(1W)printer Laser printerLaser colour printer

  • (nN)Near n (N)Near intelligent(N)machine intelligent machine machine intelligent econom?(2N)recovery economic recovery, recovery of the economy,recovery from the economic

  • FField ANDSSubfieldSentence Pollution (F) control ( ) control and management of industrial pollution

  • * * . #

  • nn

  • 1 Smok smokesmokysmokedsmokersmokessmokerssmokingsmokeless 2Smok smoke, smoky, smoked, smoker, smokes

  • analy?er analyzeranalyser

  • ?computer minicomputermicrocomputer

  • TITitle ABAbstract KYkeyword /AUauthor( /JNJournal Name( electronTI electronelectronTI,ABelectron

  • = AU= * JN=

  • 1234

  • 1CNKI2

  • 34

  • 5

    CNKI

  • 6Advanced Search Expert SearchCNKI

  • 7

    8

  • 9 1

  • 2 *3

  • 10

    11

  • 1 R P 1003030%70%1006060%40%

    Recall ratioPrecision ratio

  • 2.

    ()

  • 3(P)(R)

    100

  • 41

  • 2

  • .8.150%8.13.03.94.64.85.28.11010.511.816

  • 123

  • water blooms

  • 1. 1989-2. 1986-3. 1979-4. 1999-5. 1989-6. 1995-7. 2000-8. 1990-1 *(++)*//2 *(++)

  • (Retrieval Effectiveness) (Cranfield)