logging in or signing up Search engine jayarajvet Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 60 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: December 29, 2011 This Presentation is Public Favorites: 0 Presentation Description This information is needed for any students to get an idea about using web resources Comments Posting comment... Premium member Presentation Transcript PowerPoint Presentation: R.Jayashree Dept.of AGB,Veterinary College,Bangalore For the course on Library and information servicesDefinition: Definition Web sites that search for documents based on keywords. Search engines typically search millions of web sites for text in web pages. For the course on Library and information servicesPowerPoint Presentation: Search engines use "spiders" which search the web for information. They are software programs (Computer Robots) which request pages. In addition to reading the contents of pages for indexing, spiders also record links. For the course on Library and information servicesAs We May Think (1945): As We May Think (1945) Vannevar Bush's article was published in The Atlantic Monthly. “A record, if it is to be useful to science, must be continuously extended, it must be stored, and above all it must be consulted.” For the course on Library and information servicesPowerPoint Presentation: Gerard Salton , who died on August 28th of 1995, was the father of modern search technology. His teams at Harvard and Cornell developed the SMART informational retrieval system. Book- A Theory of Indexing which explains many of the tests upon which search is still largely based. For the course on Library and information servicesPowerPoint Presentation: Ted Nelson(1963) - coined the term hypertext . His goal was to create a computer network with a simple user interface. Alan Emtage, a student at McGill University in Montreal (1990) -created the first search engine Archie The original intent of the name was "archives," but it was shortened to Archie For the course on Library and information servicesPowerPoint Presentation: McCahill (1991 ) University of Minnesota 1. Veronica - worked on plain text files 2. Jughead - user interface. Tim Berners-Lee - The first Web site built was at http://info.cern.ch/ and was first put online on August 6, 1991. (Hyper Text Transfer Protocol ). Earlier to this people shared data was via File Transfer Protocol (FTP). For the course on Library and information servicesPowerPoint Presentation: In 1994, Berners-Lee founded the World Wide Web Consortium (W3C) at the Massachusetts Institute of Technology. -Created the Virtual Library, which is the oldest catalogue of the web . -Wrote a book - Weaving the Web . For the course on Library and information servicesPowerPoint Presentation: Primitive Web Search:( 1993) JumpStation, the World Wide Web Worm, and the Repository-Based Software Engineering (RBSE) spider. Yahoo! Directory(1 994) David Filo and Jerry Librarians' Internet Index 1995 -2005 onwards Infoseek, AltaVista, Inktomi, Ask.com , AllTheWeb,Google AdWords were launched. For the course on Library and information servicesPowerPoint Presentation: AltaVista - unlimited bandwidth - they were the first to allow natural language queries, advanced searching techniques - allowed users to add or delete their own URL (uniform resource locater) within 24 hours. On November 15, 2005 Google launched - Google Base, - Users can upload items and title, describe, and tag them as they see fit. For the course on Library and information servicesSearch engine components: Search engine components Web Page repository - Stores full HTML of down loaded pages Indexer- extract words and links from pages associating them with URLs Query Engine - receives keyword search terms from user to find matches to Document Index Page ranking - Rank the pages that match a particular query. Crawler - downloads pages from the web and present to user. For the course on Library and information services Search engine operates in the following order : Search engine operates in the following order Web crawling- helps in retrieving stored information Indexing- The contents of each page are then analyzed for example, words are extracted from the titles, headings, or special fields called meta tags. Searching- Based on the selection of key words. For the course on Library and information servicesPowerPoint Presentation: For the course on Library and information servicesTypes of search Engine: Types of search Engine Individual search engine: It has its own databases of websites and query methods eg. Altavista, Looksmart, Ask,Hotbot etc., Meta Search Engine: It queries several individual search engines simultaneously and then amalgamates the results eg., Metacrawler, Dogphile, Mama etc., For the course on Library and information servicesProcedure for online searching: Procedure for online searching Log on- User connects the terminal -identified as legitimate user. Search- Involves selection of search engine and selection of keywords or desired terms. Results- User request the result in a chosen format as pre-formatted fields or paragraph either online or offline. Log off –The searcher instructs the system to discontinue. For the course on Library and information servicesSearch Mechanism: Search Mechanism Boolean- Use ‘And,’ ‘or’ and ‘not’ to connect words or phrases in the search statement Plus/Minus- Cloning+Goat Phrases- enclosed in Double quotes- “Gregor Mendel” Proximity operators- to specify how close the terms should be-Heat()shock()Proline For the course on Library and information servicesSearch Mechanism(Contd.): Search Mechanism(Contd.) Nesting- Allows to build complex queries-Structure AND(DNA OR RNA) Wild card or Truncation Operators- This allows all terms beginning with the same letters to be retrieved- Phyloge ? Retrieves Phylogeny,phylogenics,phylogenic tree,etc For the course on Library and information servicesPowerPoint Presentation: For the course on Library and information servicesGeneral Tips for Search Strategy: General Tips for Search Strategy Be specific Use + symbol to narrow down search Use phrase searching “” Truncate words to pick singular and plural versions ? Use synonyms via Or operator Combine key words into phrases wherever possible eg ., “data” “population” Try alternate spelling Type your key word in lower case letters Be persistent and creative!!!! For the course on Library and information servicesOffline Information gateway: Offline Information gateway Information which is already in the form of CD- ROM,Book , Journals etc., Some of the Offline information CD- ROM ASFA- Aquatic Sciences and Fisheries Abstracts BEASTCD- Animal production database BIOSIS-Biological abstracts VetCD - Veterinary Science database For the course on Library and information servicesPowerPoint Presentation: Bioinformatics: UC Santa Cruz Science and Engineering Library ( http://library.ucsc.edu/science/subjects/bioinformatics/ ) National Center for Biotechnology Information (NCBI) ( http://www.ncbi.nlm.nih.gov/ ) Yahoo! Directory: Medicine: Bioinformatics ( http://dir.yahoo.com/Health/Medicine/Informatics/ ) AgBiotechNet ( http://www.agbiotechnet.com/ ) Computational Molecular Biology at NIH (http://molbio.info.nih.gov/molbio/) For the course on Library and information servicesReferences: References Finding It Online Web Search Strategies.htm. Using Search Engines and Directories - A Tutorial.htm. Using Google - A Tutorial.htm Internet Resources Related to Veterinary & Animal Science - Livestock Production Management.htm "Internet History - Search Engines" (from Search Engine Watch ), Universiteit Leiden, Netherlands, September 2001, web: LeidenU-Archie . For the course on Library and information servicesPowerPoint Presentation: For the course on Library and information servicesPowerPoint Presentation: For the course on Library and information servicesPowerPoint Presentation: Thank you For the course on Library and information services You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Search engine jayarajvet Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 60 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: December 29, 2011 This Presentation is Public Favorites: 0 Presentation Description This information is needed for any students to get an idea about using web resources Comments Posting comment... Premium member Presentation Transcript PowerPoint Presentation: R.Jayashree Dept.of AGB,Veterinary College,Bangalore For the course on Library and information servicesDefinition: Definition Web sites that search for documents based on keywords. Search engines typically search millions of web sites for text in web pages. For the course on Library and information servicesPowerPoint Presentation: Search engines use "spiders" which search the web for information. They are software programs (Computer Robots) which request pages. In addition to reading the contents of pages for indexing, spiders also record links. For the course on Library and information servicesAs We May Think (1945): As We May Think (1945) Vannevar Bush's article was published in The Atlantic Monthly. “A record, if it is to be useful to science, must be continuously extended, it must be stored, and above all it must be consulted.” For the course on Library and information servicesPowerPoint Presentation: Gerard Salton , who died on August 28th of 1995, was the father of modern search technology. His teams at Harvard and Cornell developed the SMART informational retrieval system. Book- A Theory of Indexing which explains many of the tests upon which search is still largely based. For the course on Library and information servicesPowerPoint Presentation: Ted Nelson(1963) - coined the term hypertext . His goal was to create a computer network with a simple user interface. Alan Emtage, a student at McGill University in Montreal (1990) -created the first search engine Archie The original intent of the name was "archives," but it was shortened to Archie For the course on Library and information servicesPowerPoint Presentation: McCahill (1991 ) University of Minnesota 1. Veronica - worked on plain text files 2. Jughead - user interface. Tim Berners-Lee - The first Web site built was at http://info.cern.ch/ and was first put online on August 6, 1991. (Hyper Text Transfer Protocol ). Earlier to this people shared data was via File Transfer Protocol (FTP). For the course on Library and information servicesPowerPoint Presentation: In 1994, Berners-Lee founded the World Wide Web Consortium (W3C) at the Massachusetts Institute of Technology. -Created the Virtual Library, which is the oldest catalogue of the web . -Wrote a book - Weaving the Web . For the course on Library and information servicesPowerPoint Presentation: Primitive Web Search:( 1993) JumpStation, the World Wide Web Worm, and the Repository-Based Software Engineering (RBSE) spider. Yahoo! Directory(1 994) David Filo and Jerry Librarians' Internet Index 1995 -2005 onwards Infoseek, AltaVista, Inktomi, Ask.com , AllTheWeb,Google AdWords were launched. For the course on Library and information servicesPowerPoint Presentation: AltaVista - unlimited bandwidth - they were the first to allow natural language queries, advanced searching techniques - allowed users to add or delete their own URL (uniform resource locater) within 24 hours. On November 15, 2005 Google launched - Google Base, - Users can upload items and title, describe, and tag them as they see fit. For the course on Library and information servicesSearch engine components: Search engine components Web Page repository - Stores full HTML of down loaded pages Indexer- extract words and links from pages associating them with URLs Query Engine - receives keyword search terms from user to find matches to Document Index Page ranking - Rank the pages that match a particular query. Crawler - downloads pages from the web and present to user. For the course on Library and information services Search engine operates in the following order : Search engine operates in the following order Web crawling- helps in retrieving stored information Indexing- The contents of each page are then analyzed for example, words are extracted from the titles, headings, or special fields called meta tags. Searching- Based on the selection of key words. For the course on Library and information servicesPowerPoint Presentation: For the course on Library and information servicesTypes of search Engine: Types of search Engine Individual search engine: It has its own databases of websites and query methods eg. Altavista, Looksmart, Ask,Hotbot etc., Meta Search Engine: It queries several individual search engines simultaneously and then amalgamates the results eg., Metacrawler, Dogphile, Mama etc., For the course on Library and information servicesProcedure for online searching: Procedure for online searching Log on- User connects the terminal -identified as legitimate user. Search- Involves selection of search engine and selection of keywords or desired terms. Results- User request the result in a chosen format as pre-formatted fields or paragraph either online or offline. Log off –The searcher instructs the system to discontinue. For the course on Library and information servicesSearch Mechanism: Search Mechanism Boolean- Use ‘And,’ ‘or’ and ‘not’ to connect words or phrases in the search statement Plus/Minus- Cloning+Goat Phrases- enclosed in Double quotes- “Gregor Mendel” Proximity operators- to specify how close the terms should be-Heat()shock()Proline For the course on Library and information servicesSearch Mechanism(Contd.): Search Mechanism(Contd.) Nesting- Allows to build complex queries-Structure AND(DNA OR RNA) Wild card or Truncation Operators- This allows all terms beginning with the same letters to be retrieved- Phyloge ? Retrieves Phylogeny,phylogenics,phylogenic tree,etc For the course on Library and information servicesPowerPoint Presentation: For the course on Library and information servicesGeneral Tips for Search Strategy: General Tips for Search Strategy Be specific Use + symbol to narrow down search Use phrase searching “” Truncate words to pick singular and plural versions ? Use synonyms via Or operator Combine key words into phrases wherever possible eg ., “data” “population” Try alternate spelling Type your key word in lower case letters Be persistent and creative!!!! For the course on Library and information servicesOffline Information gateway: Offline Information gateway Information which is already in the form of CD- ROM,Book , Journals etc., Some of the Offline information CD- ROM ASFA- Aquatic Sciences and Fisheries Abstracts BEASTCD- Animal production database BIOSIS-Biological abstracts VetCD - Veterinary Science database For the course on Library and information servicesPowerPoint Presentation: Bioinformatics: UC Santa Cruz Science and Engineering Library ( http://library.ucsc.edu/science/subjects/bioinformatics/ ) National Center for Biotechnology Information (NCBI) ( http://www.ncbi.nlm.nih.gov/ ) Yahoo! Directory: Medicine: Bioinformatics ( http://dir.yahoo.com/Health/Medicine/Informatics/ ) AgBiotechNet ( http://www.agbiotechnet.com/ ) Computational Molecular Biology at NIH (http://molbio.info.nih.gov/molbio/) For the course on Library and information servicesReferences: References Finding It Online Web Search Strategies.htm. Using Search Engines and Directories - A Tutorial.htm. Using Google - A Tutorial.htm Internet Resources Related to Veterinary & Animal Science - Livestock Production Management.htm "Internet History - Search Engines" (from Search Engine Watch ), Universiteit Leiden, Netherlands, September 2001, web: LeidenU-Archie . For the course on Library and information servicesPowerPoint Presentation: For the course on Library and information servicesPowerPoint Presentation: For the course on Library and information servicesPowerPoint Presentation: Thank you For the course on Library and information services