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Yoshihisa Okumura - Wikipedia
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February 2023) was a Japanese engineer, known for development of <a href="/wiki/Radio_propagation_models" class="mw-redirect" title="Radio propagation models">cellular telephone networks</a>. His radio survey of signal strength as a function of distance as measured in drive tests in automobiles was critical to the system planning of mobile radio telephone systems. </p> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Yoshihisa_Okumura.tif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/95/Yoshihisa_Okumura.tif/lossy-page1-220px-Yoshihisa_Okumura.tif.jpg" decoding="async" width="220" height="293" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/95/Yoshihisa_Okumura.tif/lossy-page1-330px-Yoshihisa_Okumura.tif.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/95/Yoshihisa_Okumura.tif/lossy-page1-440px-Yoshihisa_Okumura.tif.jpg 2x" data-file-width="762" data-file-height="1016" /></a><figcaption>Okumura at the (US) National Academy of Engineering presentation of the 2013 Charles Stark Draper Prize</figcaption></figure> <div class="mw-heading mw-heading2"><h2 id="Professional_career">Professional career</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Yoshihisa_Okumura&action=edit&section=1" title="Edit section: Professional career"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Okumura was born in <a href="/wiki/Isikawa_Prefecture" class="mw-redirect" title="Isikawa Prefecture">Isikawa Prefecture</a> on 2 July 1926.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> He studied <a href="/wiki/Electrical_engineering" title="Electrical engineering">electrical engineering</a> at Kanazawa Technical College (金沢工業専門学校 Kanazawa kōgyō senmon gakkō, formerly the faculty of engineering of <a href="/wiki/Kanazawa_University" title="Kanazawa University">Kanazawa University</a>) from 1944 to 1947. </p><p>Okumura began his professional career in 1950 with <a href="/wiki/Nippon_Telegraph_and_Telephone" title="Nippon Telegraph and Telephone">Nippon Telegraph and Telephone Public Corporation</a> (NTT, now privatised), where he collected radio propagation data in the 150 to 1920 MHz bands. These bands were later identified as appropriate for mobile phone systems (in no small part, because of the data collected by Okumura). </p><p>Okumura's careful study in various topographical environments in metropolitan, suburban, rural and even mountainous regions at distances from 1 to 100 km was published in 1968.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>His 10-year survey included varying the height of the antennas from ground level to 10 meters which helps in planning radio coverage of mobile phone cell towers. Okumura's work was advanced in the International Radio Consultative Conference (CCIR) which recognized that this work was applicable to all countries contemplating mobile cellular phone systems. The curves he published have become known as the <a href="/wiki/Okumura_Model" class="mw-redirect" title="Okumura Model">Okumura Model</a> and were critical to identifying the 800 MHz band as an appropriate target for mobile phone operation. </p><p>About 1970, Okumura was promoted to the directorship of the Mobile System Research Section of the Electrical Communication Laboratory (ECL) of NTT. His staff grew to about 20 individuals, who pioneered the early high capacity cellular phone systems. </p><p>Okumura retired from the ECL in 1975 and joined Toshiba. In 1979 he became a professor in <a href="/wiki/Kanazawa_Institute_of_Technology" title="Kanazawa Institute of Technology">Kanazawa Institute of Technology</a>, retiring in 2000 as professor emeritus. </p><p>Okumura died on 18 February 2023, at the age of 96.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Publications">Publications</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Yoshihisa_Okumura&action=edit&section=2" title="Edit section: Publications"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://books.google.com/books?id=DoY1AQAAIAAJ&q=Yoshihisa+Okumura+July+2+,+1926"><i>Electronics & Communications in Japan, Volume 47</i></a>. Scripta Publishing Company. 1965. p. 75<span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Electronics+%26+Communications+in+Japan%2C+Volume+47&rft.pages=75&rft.pub=Scripta+Publishing+Company&rft.date=1965&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DDoY1AQAAIAAJ%26q%3DYoshihisa%2BOkumura%2BJuly%2B2%2B%2C%2B1926&rfr_id=info%3Asid%2Fen.wikipedia.org%3AYoshihisa+Okumura" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.nae.edu/67334.aspx">"NAE Website - Yoshihisa Okumura"</a>. <a href="/wiki/National_Academy_of_Engineering" title="National Academy of Engineering">National Academy of Engineering</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=NAE+Website+-+Yoshihisa+Okumura&rft.pub=National+Academy+of+Engineering&rft_id=http%3A%2F%2Fwww.nae.edu%2F67334.aspx&rfr_id=info%3Asid%2Fen.wikipedia.org%3AYoshihisa+Okumura" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"> Y. Okumura, <i>Field strength and its variability in VHF and UHF land-mobile radio service</i>, Electrical Communication Laboratory, Vol 16, Number 9–10, 1968.</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation news cs1"><a rel="nofollow" class="external text" href="https://www3.nhk.or.jp/lnews/kanazawa/20230219/3020014319.html">"携帯電話の実用化に貢献 奥村善久氏が死去 96歳"</a>. NHK. 19 February 2023<span class="reference-accessdate">. Retrieved <span class="nowrap">20 February</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=%E6%90%BA%E5%B8%AF%E9%9B%BB%E8%A9%B1%E3%81%AE%E5%AE%9F%E7%94%A8%E5%8C%96%E3%81%AB%E8%B2%A2%E7%8C%AE+%E5%A5%A5%E6%9D%91%E5%96%84%E4%B9%85%E6%B0%8F%E3%81%8C%E6%AD%BB%E5%8E%BB+%EF%BC%99%EF%BC%96%E6%AD%B3&rft.date=2023-02-19&rft_id=https%3A%2F%2Fwww3.nhk.or.jp%2Flnews%2Fkanazawa%2F20230219%2F3020014319.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AYoshihisa+Okumura" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="Awards">Awards</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Yoshihisa_Okumura&action=edit&section=3" title="Edit section: Awards"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Charles_Stark_Draper_Prize" title="Charles Stark Draper Prize">Charles Stark Draper Prize</a> (2013) with <a href="/wiki/Joel_S._Engel" title="Joel S. Engel">Joel S. Engel</a>, <a href="/wiki/Martin_Cooper_(inventor)" title="Martin Cooper (inventor)">Martin Cooper</a>, <a href="/wiki/Thomas_Haug" title="Thomas Haug">Thomas Haug</a> and <a href="/wiki/Richard_H._Frenkiel" title="Richard H. Frenkiel">Richard H. Frenkiel</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist dd::after,.mw-parser-output .hlist li::after{content:" · ";font-weight:bold}.mw-parser-output .hlist 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rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Charles_Stark_Draper_Prize" title="Template:Charles Stark Draper Prize"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Charles_Stark_Draper_Prize" title="Template talk:Charles Stark Draper Prize"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Charles_Stark_Draper_Prize" title="Special:EditPage/Template:Charles Stark Draper Prize"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Charles_Stark_Draper_Prize_recipients" style="font-size:114%;margin:0 4em"><a href="/wiki/Charles_Stark_Draper_Prize" title="Charles Stark Draper Prize">Charles Stark Draper Prize</a> recipients</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">1980s</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Jack_Kilby" title="Jack Kilby">Jack Kilby</a> / <a href="/wiki/Robert_Noyce" title="Robert Noyce">Robert Noyce</a> (1989)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1990s</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Frank_Whittle" title="Frank Whittle">Frank Whittle</a> / <a href="/wiki/Hans_von_Ohain" title="Hans von Ohain">Hans von Ohain</a> (1991)</li> <li><a href="/wiki/John_Backus" title="John Backus">John Backus </a> (1993)</li> <li><a href="/wiki/John_R._Pierce" title="John R. Pierce">John R. Pierce</a> / <a href="/wiki/Harold_A._Rosen" class="mw-redirect" title="Harold A. Rosen">Harold A. Rosen</a> (1995)</li> <li><a href="/wiki/Vladimir_Haensel" title="Vladimir Haensel">Vladimir Haensel</a> (1997)</li> <li><a href="/wiki/Charles_K._Kao" title="Charles K. Kao">Charles K. Kao</a> / <a href="/wiki/Robert_D._Maurer" title="Robert D. Maurer">Robert D. Maurer</a> / <a href="/wiki/John_B._MacChesney" title="John B. MacChesney">John B. MacChesney</a> (1999)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">2000s</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Vinton_Cerf" class="mw-redirect" title="Vinton Cerf">Vinton Cerf</a> / <a href="/wiki/Bob_Kahn" class="mw-redirect" title="Bob Kahn">Bob Kahn</a> / <a href="/wiki/Leonard_Kleinrock" title="Leonard Kleinrock">Leonard Kleinrock</a> / <a href="/wiki/Lawrence_G._Roberts" class="mw-redirect" title="Lawrence G. Roberts">Lawrence G. Roberts</a> (2001)</li> <li><a href="/wiki/Robert_S._Langer" title="Robert S. Langer">Robert Langer</a> (2002)</li> <li><a href="/wiki/Ivan_Getting" title="Ivan Getting">Ivan Getting</a> / <a href="/wiki/Bradford_Parkinson" title="Bradford Parkinson">Bradford Parkinson</a> (2003)</li> <li><a href="/wiki/Alan_Kay" title="Alan Kay">Alan Kay </a> / <a href="/wiki/Butler_Lampson" title="Butler Lampson">Butler Lampson</a> / <a href="/wiki/Robert_Taylor_(computer_scientist)" title="Robert Taylor (computer scientist)">Robert Taylor</a> / <a href="/wiki/Charles_P._Thacker" title="Charles P. Thacker">Charles P. Thacker</a> (2004)</li> <li>Minoru S. Araki / Francis J. Madden / Edward A. Miller / <a href="/wiki/James_W._Plummer" title="James W. Plummer">James W. Plummer</a> / Don H. Schoessler (2005)</li> <li><a href="/wiki/Willard_Boyle" title="Willard Boyle">Willard Boyle</a> / <a href="/wiki/George_E._Smith" title="George E. Smith">George E. Smith</a> (2006)</li> <li><a href="/wiki/Tim_Berners-Lee" title="Tim Berners-Lee">Tim Berners-Lee</a> (2007)</li> <li><a href="/wiki/Rudolf_E._K%C3%A1lm%C3%A1n" title="Rudolf E. Kálmán">Rudolf E. Kálmán</a> (2008)</li> <li><a href="/wiki/Robert_H._Dennard" title="Robert H. Dennard">Robert H. Dennard</a> (2009)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">2010s</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Frances_Arnold" title="Frances Arnold">Frances Arnold</a> / <a href="/wiki/Willem_P._C._Stemmer" title="Willem P. C. Stemmer">Willem P. C. Stemmer</a> (2011)</li> <li><a href="/wiki/George_H._Heilmeier" title="George H. Heilmeier">George H. Heilmeier</a> / <a href="/wiki/Wolfgang_Helfrich" title="Wolfgang Helfrich">Wolfgang Helfrich</a> / <a href="/wiki/Martin_Schadt" title="Martin Schadt">Martin Schadt</a> / <a href="/wiki/T._Peter_Brody" title="T. Peter Brody">T. Peter Brody</a> (2012)</li> <li><a href="/wiki/Thomas_Haug" title="Thomas Haug">Thomas Haug</a> / <a href="/wiki/Martin_Cooper_(inventor)" title="Martin Cooper (inventor)">Martin Cooper</a> / <a class="mw-selflink selflink">Yoshihisa Okumura</a> / <a href="/wiki/Richard_H._Frenkiel" title="Richard H. Frenkiel">Richard H. Frenkiel</a> / <a href="/wiki/Joel_S._Engel" title="Joel S. Engel">Joel S. Engel</a> (2013)</li> <li><a href="/wiki/John_B._Goodenough" title="John B. Goodenough">John B. Goodenough</a> / Yoshio Nishi / <a href="/wiki/Rachid_Yazami" title="Rachid Yazami">Rachid Yazami</a> / <a href="/wiki/Akira_Yoshino" title="Akira Yoshino">Akira Yoshino</a> (2014)</li> <li><a href="/wiki/Isamu_Akasaki" title="Isamu Akasaki">Isamu Akasaki</a> / <a href="/wiki/M._George_Craford" title="M. George Craford">George Craford</a> / <a href="/wiki/Russell_Dupuis" title="Russell Dupuis">Russell Dupuis</a> / <a href="/wiki/Nick_Holonyak" title="Nick Holonyak">Nick Holonyak</a> / <a href="/wiki/Shuji_Nakamura" title="Shuji Nakamura">Shuji Nakamura</a> (2015)</li> <li><a href="/wiki/Andrew_Viterbi" title="Andrew Viterbi">Andrew Viterbi</a> (2016)</li> <li><a href="/wiki/Bjarne_Stroustrup" title="Bjarne Stroustrup">Bjarne Stroustrup</a> (2018)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">2020s</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Jean_Fr%C3%A9chet" title="Jean Fréchet">Jean Fréchet</a> / C. Grant Willson (2020)</li> <li><a href="/wiki/Steve_Furber" title="Steve Furber">Steve Furber</a> / <a href="/wiki/John_L._Hennessy" title="John L. Hennessy">John L. Hennessy</a> / <a href="/wiki/David_Patterson_(computer_scientist)" title="David Patterson (computer scientist)">David Patterson</a> / <a href="/wiki/Sophie_Wilson" title="Sophie Wilson">Sophie Wilson</a> (2022)</li></ul> </div></td></tr></tbody></table></div> <!-- NewPP limit report Parsed by mw‐web.codfw.main‐f69cdc8f6‐kmvjg Cached time: 20241123053942 Cache expiry: 2592000 Reduced expiry: false Complications: [vary‐revision‐sha1] CPU time usage: 0.436 seconds Real time usage: 0.623 seconds Preprocessor visited node count: 532/1000000 Post‐expand include size: 17427/2097152 bytes Template argument size: 683/2097152 bytes Highest expansion depth: 12/100 Expensive parser function count: 2/500 Unstrip recursion depth: 1/20 Unstrip post‐expand size: 19512/5000000 bytes Lua time usage: 0.313/10.000 seconds Lua memory usage: 16319147/52428800 bytes Number of Wikibase entities loaded: 1/400 --> <!-- Transclusion expansion time report (%,ms,calls,template) 100.00% 482.550 1 -total 27.42% 132.301 1 Template:Langx 26.45% 127.654 1 Template:Reflist 20.87% 100.727 1 Template:Charles_Stark_Draper_Prize 20.07% 96.825 1 Template:Navbox 19.92% 96.111 1 Template:Cite_book 15.88% 76.633 1 Template:Short_description 9.06% 43.703 2 Template:Pagetype 5.22% 25.172 1 Template:Authority_control 4.00% 19.302 4 Template:Main_other --> <!-- Saved in parser cache with key enwiki:pcache:idhash:38629232-0!canonical and timestamp 20241123053942 and revision id 1253766859. 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