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          計算機文獻檢索的常用方法介紹(快速查找)
          發布時間:2019-03-06


            隨著計算機技術、國際互聯網技術、信息技術、數據庫技術、電子出版技術等的快速發展,世界已經進入了信息化時代。在這種情況下,科技信息的收集、組織、傳播、利用等各方面都發生了深刻的變化,一些以計算機技術、網絡技術、數據庫技術及現代通訊技術為基礎的新的文獻檢索方法已日趨完善,它們正以其高效、便捷和低成本的絕對優勢,迅速在廣大科技人員中普及,大有替代傳統檢索方式的趨勢。這些新技術主要有:

            一、利用搜索引擎在國際互聯網(Internet)上檢索。

            要在Internet上查找某主題的相關內容,利用網絡搜索引擎不失為一種便捷高效且節省成本的好方法。常見的搜索引擎有:

            Google (http://www.google.com/)、Excite (http://www.excite.com/)、Yahoo search (http://search.yahoo.com/)、搜狐搜索(http://dir.sogou.com/)、網易搜索(http://so.163.com/)、新浪搜索(http://cha.sina.com.cn/)等,新的搜索引擎還在不斷出現。網絡搜索引擎的搜索技術不斷發展,其搜索范圍之廣、速度之快是出乎想象的,但要獲得比較準確和全面的搜索結果,還需要在大量實踐的基礎上總結出高超的使用技巧。

            利用搜索引擎在國際互聯網上的搜索可以獲得相關主題的廣泛信息,但所得結果往往不夠精確,也不夠專業,不是獲取系統專業知識的最佳途徑。要對專業知識進行全面和深入的檢索,一般應當利用相關專業的數據庫檢索等途徑。

            針對網絡搜索引擎存在的這一不足,最近美國的Google公司通過與一些學術機構和電子文獻供應商合作,推出了Google學術搜索服務,利用這一搜索功能,讀者可以方便地檢索到大量專題學術文獻資料。Google搜索引擎由Larry Page和Sergey Brin共同開發,是目前公認的全球最大的搜索引擎,它提供了簡單易用的免費服務,用戶可以在瞬間返回相關的搜索結果,目前新增的學術搜索服務必將使它的作用和影響進一步擴大,在沒有更好的網絡資源可以利用的情況下,Google學術搜索服務不失為所有上網人員都可以免費使用的查找專題文獻的好工具。Google學術搜索的網址:http://scholar.google.com/.

          <br />

            二、計算機光盤檢索

            目前世界上的電子出版物已相當普遍昨為電子出版的載體之一,文獻光盤及其檢索系統的產品已經很多,如美國的化學文摘(CA)光盤版,美國科技信息所(ISI)的科學引文索引CD-ROM光盤版,清華同方中國學術期刊電子出版社(光盤版),等等。利用計算機對這些光盤進行檢索,已成為查找文獻的方法之一。光盤檢索的局限性在于,首先必須得到光盤,其次對于很大范圍的檢索需要檢索很多張光盤,這對一般計算機用戶來說比較麻煩,效率不高,再說也很少有機構能同時擁有大量的這類光盤。

            三、數據庫聯機檢索。

            將數據庫與一些終端計算機聯網使用的就是聯機數據庫,如果把數據庫上傳到國際互聯網上,通過網站服務器的方式,向全世界的互聯網用戶提供服務的,便成為Web版數據庫。我們平常稱的聯網數據庫一般是指這種Web版數據庫。這是一種把計算機技術、網絡技術和數據庫技術有機結合起來應用的檢索系統。這種聯機檢索系統所提的專業數據庫的信息,不僅系統、完整,而且更加及時,可提供全檢索等,從而極大地滿足用戶對科技信息查詢的需求。

            這些系統大都需要注冊,大多是有償服務,一般可按年交費,可以按使用時間或查詢量來付費。這些聯機數據庫檢索系統往往也供一些免費服務,如題錄檢索等。目前這類聯機數據庫有:期刊數庫、各種專業數據庫、專利數據庫、信息咨詢類的數據庫、綜合數庫,等等;更為綜合和龐大的系統還有網上虛擬圖書館。這些網上源有的是政府出資創辦和管理的,提供公共服務,多為免費,有的是企業或教學、研究機構辦的,大多為收費服務,但其中也會有一免費服務項目。

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