نظم استرجاع المعلومات الفرقة 4 مكتبات بني سويف

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نظم استرجاع المعلومات الفرقة 4 مكتبات بني سويف

  1. 1. Search Engines :As information retrieval system
  2. 2. Search EnginesSearch DirectoriesMeta Search EnginesPortals
  3. 3. spidercrawler-URLIndexer---Searcher--
  4. 4. The Parts of a Search EngineSpider (or “crawler”)IndexerSearch software (an algorithm)
  5. 5. The “spider” or “crawler”The spider visits a web page, reads it, and thenfollows links to other pages within the site. This iswhat it means when someone refers to a site being"spidered" or "crawled". This is also known as“harvesting”. The spider returns to the site on aregular basis, such as every month or two, to look forchanges.
  6. 6. 9UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools ConsultingRobot Indexing DiagramSour
  7. 7. The indexerEverything the spider finds goes into the second partof a search engine, the index. The index, sometimescalled the catalog, is like a giant book containing acopy of every web page that the spider finds. If a webpage changes, then this book is updated newinformation.
  8. 8. 11UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools ConsultingSimple Index Diagram
  9. 9. 12UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools ConsultingSearch Looks Simple
  10. 10. 13UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools ConsultingBut Its NotIndex ahead of time• Find files or records• Open each one and read it• Store each word in a searchable indexProvide search forms• Match the query terms with words in the index• Sort documents by relevanceDisplay results
  11. 11. 14UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools ConsultingcontentsearchfunctionalityuserinterfaceSearch is Mostly InvisibleLike an iceberg,2/3 below water
  12. 12. How Search Engines Work?1) They collect information from selected web sites2) The employ special software robots, called spiders, tocrawl web pages3) Spiders build lists of the words found in Web sites.1) When a spider is building its lists, the spider is Web crawling.4) Spiders store the lists in the engine’s database5) The engine’s indexing software builds an index of words6) Information is matched against query input andretrieved (processing algorithm)
  13. 13. 16UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools ConsultingSearch Processing
  14. 14. The WebURL1URL2URL3URL4CrawlerIndexerSearchEngineDatabase rivers?rivers.All AboutriversbyS. I. Am
  15. 15. ----
  16. 16. ----
  17. 17. ----Indexing--Advanced Search--
  18. 18. http://www.google.com/Pdf
  19. 19. spidercrawler-URLIndexer---Searcher--
  20. 20. 
  21. 21. http://www.yahoo.com
  22. 22. 27UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools Consulting
  23. 23. 28UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools Consulting
  24. 24. 29UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools Consulting
  25. 25. S E 1 S E 2 S E 3DispatcherDisplayUserInterfaceKnowledgePersonalizeQueryFeedbackUserWeb
  26. 26. yahoo
  27. 27. MSNLycosExcite
  28. 28. 34UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools Consulting
  29. 29. 35UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools Consulting
  30. 30. Ditto - www.ditto.comFree Photo - www.freephoto.comAmazing Image Machine -www.ncrtec.org/picture.htmPics 4 Learning www.pics4learning.com
  31. 31. 37
  32. 32. Traditional text-based image search engines• Manual annotation of images• Use text-based retrieval methodsWater liliesFlowers in a pond<Its biologicalname>
  33. 33. QBIC – Search by color** Images courtesy : Yong Rao
  34. 34. QBIC – Search by shape** Images courtesy : Yong Rao
  35. 35. QBIC – Query by sketch** Images courtesy : Yong Rao
  36. 36. 42UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools Consulting
  37. 37. Find Sounds - specialized search enginewww.findsounds.comDaily Wav - www.dailywav.comSound America -www.soundamerica.comWav Central - www.wavecentral.com
  38. 38. 44UCB SIMS 202, Sept. 2004Avi Rappoport, Search Tools Consulting
  39. 39. 45written searchingspoken searchingbrowsing techniqueterms browsingitems browsing
  40. 40. Barry’s Clipart Server -www.barrysclipart.comAnimated Gif Server -www.animatedgif.netAnimation Factory -www.animfactory.com
  41. 41. 47
  42. 42. 48100 2002510025200252525% 1002512.5% 200
  43. 43. 49
  44. 44. 50
  45. 45. 51

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