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Science.gov is a web portal and specialized search engine. Using federated search technology, Science.gov serves as a gateway to United States government scientific and technical information and research. Currently in its fifth generation, Science.gov provides a search of over 38 databases from 14 federal science agencies and 200 million pages of science information with just one query, and is a gateway to 1,900+ scientific websites.〔(Science.gov About page )〕 In 2007, a report to Congress noted that in fiscal year 2007 "Science.gov experienced 6.5 million search queries across all its scientific databases and 2.6 million page views of its website."〔(FY 2007 Report to Congress on Implementation of The E-Government Act of 2002, page 11 )〕 By 2012, the site had reached 34 million page views annually.〔(【引用サイトリンク】url=http://www.science.gov/communications/10years.html )〕 In April 2007, ''Library Journal'' included Science.gov in its list of best references of 2006.〔(Best References 2006, Brian E. Coutts & Cheryl LaGuardia -- Library Journal, April 15, 2007 )〕 Science.gov is also the United States contribution to the international portal WorldWideScience. == History == Science.gov 1.0〔(Science.gov version 1.0 announcement )〕 was launched in December 2002, providing for the first time wide public access and a unified search of the government's stores of scientific and technical information. Science.gov is an interagency initiative of 18 U.S. government science organizations within 14 Federal agencies. These agencies form the voluntary Science.gov Alliance. In May 2004, Version 2.0 was launched,〔(Science.gov version 2.0 announcement )〕 introducing real-time relevancy ranking to government science retrieval. This technology, funded by the Department of Energy, helps users sort through the government's research and return results relevant to individual needs. An advanced search capability and other enhancements were added. U.S. Secretary of Energy Spencer Abraham and Director of the Office of Science Dr. Raymond L. Orbach both remarked positively on the launch of Science.gov 2.0 on May 11, 2004.〔(Remarks prepared for U.S. Energy Secretary Spencer Abraham on the Science.gov 2.0 Launch, May 11, 2004 )〕〔(Remarks prepared for Dr. Raymond L. Orbach Director, Office of Science Science.gov 2.0 Launch Program, May 11, 2004 )〕 A free "Alert" service was released in February 2005, allowing users to receive e-mail alerts about current science developments in their areas of interest. Up to 25 relevant results from selected information sources can be delivered. Results are displayed in the Alert email and in a personalized Alert Archive, which stores six weeks of alerts results. In the Archive, past activity can be reviewed and Alert profiles edited. Launched in November 2005, Version 3.0〔(Science.gov version 3.0 announcement )〕 provided more refined search queries of federal science databases. In addition, fielded searching and Boolean capabilities were enhanced. In February 2007, Science.gov 4.0〔(Science.gov version 4.0 announcement )〕 was launched. The new version was reviewed by Gale Cengage〔(Péter Jacsó review of Science.gov version 4.0, Gale Cengage, March 2007 )〕 and Government Computer News.〔(Science.gov 4.0 delves deep into the Web, Government Computer News, February 16, 2007 )〕 Version 4.0 allowed further refinement of search queries, allowing users to search within their original results. The relevancy ranking algorithms became more sophisticated, providing ranking of the entire full text of documents on sites where searchable full text resides. Date of the document was priority-weighted for ranking purposes. A new feature allowed users to share search results via e-mail. Science.gov 5.0 was launched in September 2008 and announced in a U.S. Department of Energy Press Release.〔(U.S. Department of Energy Press Release: Access to Science Information Expands with Science.gov 5.0 Launch, September 15, 2008 )〕 The Oak Ridger covered the release〔(Science.gov 5.0 launches, The Oak Ridger - September 15, 2008 )〕 as did UPI,〔(U.S. expands science info on the Web, UPI.com, September 16, 2008 )〕 Open Access News,〔(Preview of Science.gov 5.0 Open Access News, Peter Suber, Editor - September 15, 2008 )〕 Federal Computer Week,〔(Science.gov launches a new version, Federal Computer Week, Doug Beizer, September 23, 2008 )〕 Econtent,〔(Science.gov 5.0 Released, Econtent, September 19, 2008 )〕 and SLA Government Information Division.〔(Science.gov 5.0, SLA Government Information Division, September 17, 2008 )〕 Clustering results into topics areas and the inclusion of Wikipedia topics and EurekAlert Science items related to the search were added. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Science.gov」の詳細全文を読む スポンサード リンク
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