IntroductiontoSearchEngines.ppt

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2017-03-13 发布于湖北
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IntroductiontoSearchEngines.ppt

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A. Frank-T.Sharon Internet Resources Discovery (IRD) Introduction to Search Engines Contents ???? ?????? ????? (Search Engines) ???? ????? ????? ????? ???? ??????? ???? (Information Retrieval) When to start Searching?! Why Search Engines? ???? ????? ??? ???? ????? ?????? ????? ???? ????. ?? ???? ????? ???????? ??? ????? ??? ????? ?????. ?????? ?????? ???????? ??? ???????? ?? ???? ????? ???? ?? ???? ?? ?????? ?????? ?????? ?????. ??????, ??????? ???? ???, ?????? ????? ???? ????? ??????? ?? ???? ?? ???? ?? ?? ????. ????? ????? ???????? ????? ??? ??? ??????? ???? ?? ????? ??? ???????? ???????? ?? ????, ??? ??? ???? ???? ???? ??? ????? ???? ????. ??? ?? ?? ???? ?????? ??? ???????? - ?? ??? ????? ??? ??? ??????? ??????? ?????. Search Literacy ????? ????? ?????? ?????? ????? ??? ????? ?????? ???? ????????. ?????? ??????? ?????? ?? ???? ????? ???? ??? ???????? ?? ??, ?? ??? ???? ????? ?????? ?? ????? ????? ?? ???? ????? ???? ????! ?????? ??? ???? ????? ?????? ??? ????? ??????. ???? ????? ?? ?? ????? ????? (?? ?? ?) ???????? - ?????? ??? ???? ????. Basic Web Search Engines ????? ???? (Information Search) - ????? ?????? ????? ??? ???? ?????. ????? ???? (Information Gathering) - ??????? ????? ??? – ????? ??? Web. ????? ????? ??????? ??????? ???? ????????/?????? ???????: robots, crawlers, spiders, wanderers, ants Anatomy of a Web Search Engine ????? ????? ??????? ??????? ?????? ??????? ???????: ???? ???? ?????? ??? ?????? ?? ???????. ??? ??????? ?? ????-?? ?? ???? ?????? ???????. ??? ?????? ??? ??????? ??? ???? ?? ??????. ????? ??????? ??????? ?? ??????. ????? “???? ?????” ???? ???? ????? ?? ????? ???????? ???? ????. Basic Web Search Engine Crawlers Collecting Metadata SE Basic Data Structure: Inverted File Search is done on Local SE Repository There are many search engines Common Types of Search Engines Basic Search Engines/Index assembled by software -- automated spiders or softbots. Directory/Guide Hierarchical list of