信息檢索技術(shù)講義-在線瀏覽
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【正文】 167。 減少檢索詞的輸入量，簡化檢索步驟，節(jié)省費用第三節(jié) 位置檢索 (鄰近檢索 )一 .概念及作用二 .常用的位置邏輯算符三 .位置算符的綜合運算四 .位置非算符在《美國商業(yè)與工業(yè)管理索引 ABI/INFORM》查找有關(guān) “利用計算機犯罪 ”的文獻ABI/INFORM(Copr. Data Courier Inc.)?scrime 1 0 COMPUTER CRIME ? ssand4/4/1 4/4/1Scotland Yard to Battle Escalating Crime with Computerized Command and Control SystemAnonymousComputerworld v16n37 pp: 1819 Sep 13,1982The Metropolitan Police Force at Scotland Yard has installed a puterized mand and control system. The system will place London’s bobbies at the vanguard of modern puting and munications technology. …When the system is fully operational, the police department will have direct connections with the Police National Computer for immediate access to such information as fingerprint records.一 .概念及作用? 位置邏輯檢索 (Proximity Searching)– 通過位置邏輯算符規(guī)定詞間位置關(guān)系所進行的檢索。兩詞之間可有單個空格、標(biāo)點符號（連字符）。solarenergy //?sonline可檢出 on line或或 online?sx(w)ray可檢出 xray比較檢全率?s solar (w) energy ?s solar energy?s solar and energy（ 2） (nW) －－位置順序隔詞(nWord)? （ nW） ，表示 （ nW） 所聯(lián)接的兩詞之間 可含有 0~n個詞 ，兩詞次序不能顛倒。lawsea可以檢出 LAW OF THE SEA?s(1W)puter and munication。puter?(w)crime? S5 154 COMPUTER?(W)CRIME?82027316 Time Bandits Miksanek,Chris Interface: Data Processing Mgmt v7n3 pp:8 Autumn 1982 The cost of puter crime to US businesses will exceed $200 million in 1982. Although theft of puter time occurs in most data processing (DP)centers, very few DP managers are aware of…92023058Stop, Thief!/Trends to Eye in ’92 Johnson, Bob Computerworld v16n1 pp:7276 Dec 28,1991/Jan 4,1992 Because the data processed by puters is intangible, unlimited possibilities exist for the puter criminal to obtain, misuse, or destroy information and, conceivably, ruin and anization. Recent reports have estimated US corporate losses of nearly $100 million because of puterrelated the average loss is estimated at more than $600,000…….?ss puter?(1w)crime? S6 170 COMPUTER?(1W)CRIME? (3)(N)－－ 詞位置緊連 (Near)? （ N）表示算符（ N）兩側(cè)的檢索詞必須緊密相連，但兩詞次序可以顛倒。ChemistryPhysics可檢索到詞組 Chemistry Physics和 Physics Chemistry?s?s?recovery可檢出可檢出 economic recovery。recovery from economic troubles(二 )同子字段位置檢索? （ 1） (S)－－ 子字段內(nèi)詞運算 (subfield； sentence)? (S)表示運算符要求參加運算的檢索詞必須出現(xiàn)在同一子字段中，兩詞序不受限制，詞間可含有任意個詞。?s(S)(2)(L)敘詞字段檢索 （ link）? (L)要求兩檢索詞同在敘詞字段 （ DE） 中出現(xiàn)，并且兩詞具有詞表所規(guī)定的等級關(guān)系（從屬關(guān)系）。aircraftcabins例子?s rubber (L) natural S11 23 RUBBER (L) NATURAL ?t?s(F)?s(C)位置算符和布爾算符混合使用位置算符和布爾算符混合使用DIALOG、 BRS和 ESA：先做位置檢索，再做布爾檢索； ORBIT： 先布爾檢索，后位置檢索 。redwood(w)(f)（ redwoodpine） （ deck?floor） ?sor()(f)productivityprofitability)四 .位置非算符? NOT反位
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