Google Google Google Google News AlertsGMail Google toolbarGoogle
課 程 內 容 • • Google源起 強化Google的搜尋能力 網路資源評估 Google的搜尋 具 – Google News Alerts、GMail – Google toolbar、Google Desktop Search – Blogger • 搜尋學術資源 – Google Print – Google Scholar – Google Video March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Google源起 • Google – – 發音: 'gü-"gol 名詞 noun Google是以 googol為本玩的文字遊戲 Larry and Sergey Googol是美國數學家Edward Kasner的nephew, Milton Sirotta所造 出來的字,後來因為出現在Kasner 和 James Newman的大作 “Mathematics and the Imagination” 而聲名大噪。 – Googol的意思是 1後面加上100個0,Google用這個字來彰顯公司的 使命在整理網路上龐大的、無限量的資訊。 • 前身是“Backrub” – 1995年Stanford 大學的博士生Larry Page 和 Sergey Brin所發展的 搜尋引擎 – 和大多數成功創業的美國大學生一樣,Google這家公司也是由車庫 開始的。選擇車庫的原因是洗澡、洗衣服方便,因為當時他們的服 務量就已到達 10, 000 searches a day 資料來源:http: //www. google. com/corporate/history. html March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
網站數量 • Netcraft Web Server Survey – has topped nearly 64 million sites for June 2005 64, 808, 485 sites(6千4百 80萬多個網站) – roughly 1 million sites a month 資料來源:Netcraft Web Server Survey http: //news. netcraft. com/archives/web_server_survey. html March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
June 2005 64, 808, 485 May 2005 63, 532, 742 March 2005 60, 442, 655 ( exceeded 60 million) February 2005 59, 100, 880 January 2005 December 2004 November 2004 October 2004 September 2004 August 2004 July 2004 June 2004 May 2004 April 2004 58, 194, 836 56, 923, 737 56, 115, 015 sites 55, 388, 466 sites 54, 407, 216 sites 53, 341, 867 sites 52, 131, 889 sites 51, 635, 284 sites exceeded 50 million 49, 750, 568 sites March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved. 網 站 成 長 量
課 程 內 容 • • Google源起 強化Google的搜尋能力 網路資源評估 Google的搜尋 具 – Google News Alerts、GMail – Google toolbar、Google Desktop Search – Blogger • 搜尋學術資源 – Google Print – Google Scholar – Google Video March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
網頁數量 • 搜尋引擎Google可以搜尋 March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved. 80億5千8百零 4萬 網頁
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I’m Feeling Lucky 好手氣 圖資電子報第 20期:Google好手氣 http: //www. lis. ntu. edu. tw/~pnhsieh/epapers/no 20. htm
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Server Side Client Side 資料來源:http: //computer. howstuffworks. com/search-engine 1. htm March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
如何決定相關與排序 • • Exact Phrase: 關鍵詞以片語形式出現? Adjacency: 關鍵詞之間的距離有多近? Weighting: 關鍵詞出現的次數? Page. Rank/Links: – 連進來+ • 有多少連結連到本網頁?(Popularity) • 連進來網頁的人氣指數( Popularity ) – 連出去 • 本網頁有多少連結? 公式: (Exact Phrase Hit)+(Adjacency. Factor)+(Weight) * (Page. Rank/Links) 資料來源:Google Hacking: A Crash Course http: //bss. sfsu. edu/bsscomputing/training/onthespot/alexkeller_google_hacking. pdf March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
網頁標題(Web Page Title) March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
• Title • Description • keywords March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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設定使用偏好 Preference 圖資電子報第 19期:強化Google搜尋能力:設定使用偏 好 http: //www. lis. ntu. edu. tw/~pnhsieh/epapers/no 19. htm
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語言選項 language tool
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Globalizaiton Klingon Hacker Elmer Fudd March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
翻譯 March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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Advanced Search(進階搜尋) Language Date Format :pdf, ppt Domain: . tw. edu
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標題 內文 URL 連結 除去 March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
搜尋秘笈 稱霸網林 • 關鍵詞怎麼選 – 平均輸入 1. 5個關鍵字 太少 – google可搜 80億網頁 – 5 W 1 H • • • March 25, 2005 What Who Where When why How Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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搜尋秘笈 稱霸網林 • 限定查詢範圍 結果更精確 – 語言:進階搜尋>查詢網頁語言 偏好設定 – 網域:只在或去除. edu. tw. gov. tw. com. idv. tw – 日期:過去 3個月、6個月、一年、任何時間 – 檔案類型:只在或去除. ppt. pdf. doc – 分類:網頁目錄 Google Directory sport injury rehabilitation Science > Social Sciences > Psychology > Health and Sports March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
搜尋秘笈 稱霸網林 • 指定欄位(Field Searching) – 進階搜尋:字詞位置 • 查詢字詞位於網頁的 – 標題(title) – 內文 – URL – 連結 – title: knowledge management – title: “knowledge management” – title: ”knowledge management” –site: . com March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
搜尋秘笈 稱霸網林 • 自然語言查詢 – 利用智慧代理分析輸入的問句,粹取關鍵字並 判斷關鍵字間的布林關係,送到搜尋引擎資料 庫進行查詢比對,再回饋查詢結果。 • how doctor define SARS • How search engines work • Where is a good place to stay in Boston? – Stop words(頻繁字),如a, an, at, in, the … • To be or not to be • “To be or not to be” 加引號 搜尋片語 March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
查詢結果 頁庫存檔 Cached 類似網頁 Similar Pages 結果再查詢 search within this result
按右鍵 March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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翻譯網頁內容 March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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Directory
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網頁目錄 March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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Google Services March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Google Labs March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Google Tools March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
課 程 內 容 • • Google源起 強化Google的搜尋能力 網路資源評估 Google的搜尋 具 – Google News Alerts、GMail – Google toolbar、Google Desktop Search – Blogger • 搜尋學術資源 – Google Print – Google Scholar – Google Video March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Evaluating Online Sources • Examine the URL – Who is hosting the site? Look for logos, copyright statements and the domain name (. com, . net. , . edu, personal site? ) • Look at the page content – Who wrote the page and when? Is it updated? – What are the author’s credentials? – Are sources referenced? Links credible? • What do other people think? – Google the author or use the link: feature • Think about the page’s purpose – Tone - ironic, polemical, humorous? – Why is this information on the web – it is trying to inform, persuade or sell? – Is the information peer-reviewed? Can you check the sources used? From: http: //www. lib. berkeley. edu/Teaching. Lib/Guides/Internet/Evaluate. html March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
課 程 內 容 • • Google源起 強化Google的搜尋能力 網路資源評估 Google的搜尋 具 – Google News Alerts、GMail – Google toolbar、Google Desktop Search – Blogger • 搜尋學術資源 – Google Print – Google Scholar – Google Video March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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Google Alerts March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
GMail (Google Mail) • http: //gmail. google. com • Search, don't sort. Use Google search to find the exact message you want, no matter when it was sent or received. • Don't throw anything away. 2000 megabytes of free storage so you'll never need to delete another message. 2 G (megabytes ) • Best for alert services March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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http: //toolbar. google. com/ March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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Google Desktop Search March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
What does GDS do? • GDS examines every file on your hard drive (20 GB) • Index tool • Takes an hour on most PC’s • After indexing, double click the GDS tool • Just like Google. com on your personal hard drive March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
To Run GDS • Task Tray Icon • Google Search Engine March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Where Google Can’t Lead You • Google and other search engines (A 9, Yahoo!, Altavista, Dogpile, etc. ) index and search the visible Web • Even Google doesn’t search the invisible Web – General databases (like archives of the Library) – Proprietary databases (like those costing $) – Certain excluded file types/pages (Flash, movies, sound files, etc. ) – Script-based/dynamic pages (those using extensive programming languages to display content) March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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http: //www. blogger. com March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
課 程 內 容 • • Google源起 強化Google的搜尋能力 網路資源評估 Google的搜尋 具 – Google News Alerts、GMail – Google toolbar、Google Desktop Search – Blogger • 搜尋學術資源 – Google Print – Google Scholar – Google Video March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Why use the Internet to find academic information? • The Internet can be a good source of information not available in other sources: – Conference papers – Statistics – Research in progress – News stories – Free online journals – Images – Theses March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved. Remember there is a lot of rubbish on the Internet too! Always evaluate what you find.
http: //scholar. google. com March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
引用CI的39筆資料 March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
全球那個圖書館有CI這本書 March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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名字縮寫中間不 空格並加引號 March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
author: "PL Chang" March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Taiwan author: "PL Chang" March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
About Google Scholar • search specifically for scholarly literature – including peer-reviewed papers, theses, books, preprints, abstracts and technical reports • to find articles from a wide variety of academic publishers, professional societies, preprint repositories and universities, as well as scholarly articles available across the web • English only Note: NOT all results from Google Scholar are freely available in full text on the web. Some may be available through library subscriptions (check the library catalogue and databases or ask Ref. Services for help) March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Subject specific Engines • Search engines use software programs to create lists of websites that can be searched using keywords. • Each search engine varies by: – the number of sources it searches – the type of resources it searches • general search engines: Google • subject specific engines: Scirus www. google. com and www. scirus. com March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Google Print March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
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Google TV • Several companies are creating TV Video Search Capabilities – Microsoft, Yahoo • To build the service, the company is recording live tv shows and indexing the related closed-caption text of the programming (Library) March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Searching Television Video March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Searching Television Video March 25, 2005 Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
網路資源搜尋 具 • 分類目錄(subject directories) – 網站 – Yahoo, Yam • 搜尋引擎(search engines) – 網頁 – Google, Alltheweb, altavista – Openfind, sina (找期刊論文) • 整合式搜尋引擎(meta search engines) – 網頁 – Mama, Dog. Pile, Search. com March 25, 2005 • 入口網站(Portal) • 網站指南(Web Guide) Copyright 2005 Pao-Nuan Hsieh. All rights reserved.
Thank you http: //www. lis. ntu. edu. tw/~pnhsieh/
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