Click here to load reader

第二章 检索基础知识

  • View
    116

  • Download
    8

Embed Size (px)

DESCRIPTION

第二章 检索基础知识. 傅立云 [email protected] 一、 文献及概念. 1 、定义 : 一切记录有知识的载体 知识: 文献的内容 载体:文献的形态 , 如甲骨、青铜器、纸介型 、胶片,磁带,磁盘,光盘等 记录:构成文献的重要手段 图 1 - 1 知识、文献、创新的知识的关系. 传递应用. 记录. 文献. 创新的知识. 知识. 2 、文献的分类. 按加工深度分 按出版方式分 按载体形态分. 按加工的深度分类:. 一次文献: - PowerPoint PPT Presentation

Text of 第二章 检索基础知识

  • [email protected]

  • 1: , 11

  • 2

  • : ,,,, :

  • ()

  • """",

  • 2

  • 1.1 (Book) . : , :

  • (ISBN)(International Standard Book Number)ISBN7501312893012347,ISBN

  • 1.2 ; ;60%-70%

  • ISSNISSN ISSN1001--8867

  • 1.3

  • 1.4

    ;

  • PB AD NASA DOE 610%-20%

  • 1(CSTAD) http://lib.xtu.edu.cn/new_lib/index.asp 2 http://www.cnerc.gov.cn/ 3NSTL http://www.nstl.gov.cn/

  • 4NAST http://www.nast.org.cn/ 5http://www.las.ac.cn/index_others.jsp?subjectselect=sciencereport&searchwords

  • 1.5

  • 1.5

  • 1.6

  • PQDDUMI1000150PQDD 11861 2 3199724

  • 1.7

  • GB6820-93 GB/T13752-92

    QB100790(1990" " )

    Q/JB1-791979

  • 2

  • 1 ,

  • 2 ,,.

  • 3

  • 4 dialog

  • 3

  • 3.1

  • 3.1

  • 3.1

  • 2.1

    Apabi

  • 2.2 CNKI

  • 2.3 CNKI-- --PQDD

  • 2.4

    CNKI--

  • 2.5 CNKI--

  • 2.6 1Science Direct 2Springlink & Kluwer 3SpecialSciDBS() 4InfoTrac OneFile

  • 2.7 1CSCD 2CSSCI 3 INSPEC

  • 2.8 1 2 www.sipo.gov.cn/sipo2008/ ep.espacenet.com/ www.uspto.gov/ www.google.com/patents

  • 2.9

  • 2.10 ()(NSTL)

  • 2.11 Wiley ACS SIAM

  • IOP AIP\APS

  • IEEE Computer Society231700

  • westlaw international Lexis.comLexisNexis

  • 1234

  • 1 Email

  • 1.1

  • 1synthesis of polyethylene

    synthesis polyethylene

    and Synthesis and polyethylene

  • 2

    ( or or) and and

  • 3

    and ( or or )and ( or )

  • ---4

    and

  • ---

    1.,or

    2.

    3.

    4.

  • 5.

    6.

  • 2

  • 3

  • NOT

    AND

    OR

  • AND

    AND*

  • : or or OR

  • : not NOT

  • information retrieval

    {}

  • andornot *+-

    -

  • :

  • W(nW)(N),(nN)

  • W W

    biological (W) controlbiological controlCD (W) ROM CD ROMCD-ROM

  • (nW) (nW) 0-n

    wear (1W) materialswear materialswear of materials

  • NN

    information(1N)retrieval : information retrieval retriveal of information

  • nNnN0-n environment (2N) protection

    environment protectionenvironment of the protection environment of water protection

  • ScienceDirect W/nn, environment w/3 protection PRE/nn, environment pre/3 protection

  • environment w/3 protection

  • environment pre/3 protection

  • *regard* regard,regarding,regardless01wom?n woman,womennn

  • *computer computerminicomputer microcomputer

    grow* ,growgrowthgrowing

    colo?r colour()color()

  • *#

    *

  • 4

  • 1 and or *(+)

    and ( or )*(+)

  • 2 1 CNKI 2 1 2

  • 2

  • 3 4

  • :SCI,EI,ISTP :403, 58292141

    The vision for this next broadcast medium necessarily contrasts itself with traditional broadcasts. Its not that interesting to just re-feed a radio or television broadcast, although there may be high value in doing so if you live in a hilly and poor radio broadcast area such as the Seattle metropolitan basin. In many circumstances you can receive a dramatically cleaner signal by listening to KING FM through the Internet than through through a radio.Audio and video are interesting in themselves, but the wonders of digital media is that they can be combined with the powers that we assume from the Internet itself to provide wholly new and more fulfilling experiences. It could be song lyrics, biographical information, live interviews. It could e-commerce, tying together the world of instant gratification I like that song, I just bought that song. It could be whole new levels of advertising that is tied into specific psycho-demographics. It could be entirely new virtual worlds that will give our future historians their next holographic paragraph after the day in which we live.RealSystem supports all media. While we believe that RealAudio 8 is the worlds best audio, weve obviously made enormous investments in MP3 and just shipped support for streaming MP3 from RealSystem iQ. We believe RealVideo 8 by far and away delivers the best price performance and quality of any video codec technology. But of course our system supports MPEG1, MPEG2 and there are people working on unannounced MPEG4 solutions.If you truly want to embrace diversity then you must also provide freedom of choice.Its not an exaggeration to say that over the past year we have seen Internet broadcasting simply explode. Here are a few metrics that I think are truly impressive and give a sense of the scope of activity:

    Over 3,000 stations now webcastingMore than 6,000 hours per week new A/V programmingOver 2,300 hours per week new on-demand programmingOver 1 million pages with links to A/V in Real formats

    Before we get into the details of RealSytem iQ, lets take a moment and go over the components that make up the system.

    There are three segments to having a streaming presence on the web.CreateDeliverReach

    RealSystem iQ contains the products in in each of these categories to Create, Deliver and Reach the largest audiences for streaming media.

    Before we get into the details of RealSytem iQ, lets take a moment and go over the components that make up the system.

    There are three segments to having a streaming presence on the web.CreateDeliverReach

    RealSystem iQ contains the products in in each of these categories to Create, Deliver and Reach the largest audiences for streaming media.

    Its not an exaggeration to say that over the past year we have seen Internet broadcasting simply explode. Here are a few metrics that I think are truly impressive and give a sense of the scope of activity:

    Over 3,000 stations now webcastingMore than 6,000 hours per week new A/V programmingOver 2,300 hours per week new on-demand programmingOver 1 million pages with links to A/V in Real formats