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Yoshihisa Okumura
Yoshihisa Okumura (; 2 July 1926 – 18 February 2023) was a Japanese engineer, known for development of radio propagation models, cellular telephone networks. 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. Professional career Okumura was born in Isikawa Prefecture on 2 July 1926. He studied electrical engineering at Kanazawa Technical College (金沢工業専門学校 Kanazawa kōgyō senmon gakkō, formerly the faculty of engineering of Kanazawa University) from 1944 to 1947. Okumura began his professional career in 1950 with Nippon Telegraph and Telephone, Nippon Telegraph and Telephone Public Corporation (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). Okumura's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Propagation Models
Radio propagation is the behavior of radio waves as they travel, or are propagated, from one point to another in vacuum, or into various parts of the atmosphere. As a form of electromagnetic radiation, like light waves, radio waves are affected by the phenomena of reflection, refraction, diffraction, absorption, polarization, and scattering. Understanding the effects of varying conditions on radio propagation has many practical applications, from choosing frequencies for amateur radio communications, international shortwave broadcasters, to designing reliable mobile telephone systems, to radio navigation, to operation of radar systems. Several different types of propagation are used in practical radio transmission systems. ''Line-of-sight propagation'' means radio waves which travel in a straight line from the transmitting antenna to the receiving antenna. Line of sight transmission is used for medium-distance radio transmission, such as cell phones, cordless phones, walkie- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Martin Cooper (inventor)
Martin Cooper (born December 26, 1928) is an American engineer. He is a pioneer in the wireless communications industry, especially in radio spectrum management, with eleven patents in the field.Encyclopedia of World Biography, 2008 encyclopedia.com On April 3, 1973, Cooper placed the first public call from a handheld portable cell phone while working at , from a Manhattan sidewalk to his counterpart at competitor . [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Draper Prize Winners
Draper was originally a term for a retailer or wholesaler of cloth that was mainly for clothing. A draper may additionally operate as a cloth merchant or a haberdasher. History Drapers were an important guild, trade guild during the medieval period, when the sellers of cloth operated out of drapers' shops. However the original meaning of the term has now largely fallen out of use. In 1724, Jonathan Swift wrote a series of Satire, satirical pamphlets in the guise of a draper called the ''Drapier's Letters''. Historical drapers A number of notable people who have at one time or another worked as drapers include: * Sir Thomas Adams, 1st Baronet (1586–1667/1668), Lord Mayor of the City of London * William Barley (1565?–1614), bookseller and publisher * Norman Birkett, 1st Baron Birkett, Norman Birkett * Margaret Bondfield * Thomas Burberry, Founder of fashion brand "Burberry" * Eleanor Coade (1733–1821), successful businesswoman with Coade stone * John Graunt, founder of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toshiba People
is a Japanese multinational electronics company headquartered in Minato, Tokyo. Its diversified products and services include power, industrial and social infrastructure systems, elevators and escalators, electronic components, semiconductors, hard disk drives, printers, batteries, lighting, as well as IT solutions such as quantum cryptography. It was formerly also one of the biggest manufacturers of personal computers, consumer electronics, home appliances, and medical equipment. The Toshiba name is derived from its former name, Tokyo Shibaura Denki K.K. which in turn was a 1939 merger between Shibaura Seisaku-sho (founded in 1875) and Tokyo Denki (founded in 1890). The company name was officially changed to Toshiba Corporation in 1978. A technology company with a long history and sprawling businesses, Toshiba is a household name in Japan and has long been viewed as a symbol of the country's technological prowess post-World War II. As a semiconductor company and the inven ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japanese Electrical Engineers
Japanese may refer to: * Something from or related to Japan, an island country in East Asia * Japanese language, spoken mainly in Japan * Japanese people, the ethnic group that identifies with Japan through ancestry or culture ** Japanese diaspora, Japanese emigrants and their descendants around the world * Japanese citizens, nationals of Japan under Japanese nationality law ** Foreign-born Japanese, naturalized citizens of Japan * Japanese writing system, consisting of kanji and kana * Japanese cuisine, the food and food culture of Japan See also * List of Japanese people * * Japonica (other) * Japanese studies , sometimes known as Japanology in Europe, is a sub-field of area studies or East Asian studies involved in social sciences and humanities research on Japan. It incorporates fields such as the study of Japanese language, history, culture, litera ... {{disambiguation Language and nationality disambiguation pages ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
People From Ishikawa Prefecture
The term "the people" refers to the public or common mass of people of a polity. As such it is a concept of human rights law, international law as well as constitutional law, particularly used for claims of popular sovereignty. In contrast, a people is any plurality of persons considered as a whole. Used in politics and law, the term "a people" refers to the collective or community of an ethnic group or nation. Concepts Legal Chapter One, Article One of the Charter of the United Nations states that "peoples" have the right to self-determination. Though the mere status as peoples and the right to self-determination, as for example in the case of Indigenous peoples (''peoples'', as in all groups of indigenous people, not merely all indigenous persons as in ''indigenous people''), does not automatically provide for independent sovereignty and therefore secession. Indeed, judge Ivor Jennings identified the inherent problems in the right of "peoples" to self-determination, as i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2023 Deaths
This is a list of lists of deaths of notable people, organized by year. New deaths articles are added to their respective month (e.g., Deaths in ) and then linked below. 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 Earlier years ''Deaths in years earlier than this can usually be found in the main articles of the years.'' See also * Lists of deaths by day * Deaths by year (category) {{DEFAULTSORT:deaths by year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1926 Births
In Turkey, the year technically contained only 352 days. As Friday, December 18, 1926 ''(Julian Calendar)'' was followed by Saturday, January 1, 1927 '' (Gregorian Calendar)''. 13 days were dropped to make the switch. Turkey thus became the last country to officially adopt the Gregorian Calendar, which ended the 344-year calendrical switch around the world that took place in October, 1582 by virtue of the Papal Bull made by Pope Gregory XIII. Events January * January 3 – Theodoros Pangalos declares himself dictator in Greece. * January 8 **Ibn Saud is crowned ruler of the Kingdom of Hejaz. ** Crown Prince Nguyễn Phúc Vĩnh Thuy ascends the throne as Bảo Đại, the last monarch of the Nguyễn dynasty of the Kingdom of Vietnam. * January 16 – A British Broadcasting Company radio play by Ronald Knox about workers' revolution in London causes a panic among those who have not heard the preliminary announcement that it is a satire on broadcasting. * January 21 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Richard H
Richard is a male given name. It originates, via Old French, from Old Frankish and is a compound of the words descending from Proto-Germanic language">Proto-Germanic ''*rīk-'' 'ruler, leader, king' and ''*hardu-'' 'strong, brave, hardy', and it therefore means 'strong in rule'. Nicknames include " Richie", " Dick", " Dickon", " Dickie", " Rich", " Rick", "Rico (name), Rico", " Ricky", and more. Richard is a common English (the name was introduced into England by the Normans), German and French male name. It's also used in many more languages, particularly Germanic, such as Norwegian, Danish, Swedish, Icelandic, and Dutch, as well as other languages including Irish, Scottish, Welsh and Finnish. Richard is cognate with variants of the name in other European languages, such as the Swedish "Rickard", the Portuguese and Spanish "Ricardo" and the Italian "Riccardo" (see comprehensive variant list below). People named Richard Multiple people with the same name * Richard Ander ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Haug
Thomas Haug (26 April 1927 – 9 December 2023) was a Norwegian-Swedish electrical engineer known for developing the Nordic Mobile Telephone, cellular telephone networks. Early life and education Thomas Haug was born in Norway on 26 April 1927. He received a master's degree in Electrical Engineering from the Technical University of Norway in Trondheim in 1951, and a degree of Licentiate from KTH—corresponding to a PhD—from the Royal Institute of Technology in Stockholm in 1973. Professional career Haug worked at the Ericsson group in Stockholm and with Westinghouse in Baltimore, Maryland, USA, primarily on radio projects. In 1966 Haug joined the Swedish Board of Telecommunications where, together with Östen Mäkitalo and lead the joint Nordic project for cellular communications called the Nordic Mobile Telephone (NMT) system. NMT was an analog mobile phone system commercialized in 1980 in Saudi Arabia and throughout the Nordic countries through 1982, reaching 1 million s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joel S
Joel or Yoel is a name meaning "Yahweh Is God" in Hebrew and may refer to: * Joel (given name), including a list of people named Joel or Yoel * Joel (surname), a surname * Joel (footballer, born 1904), Joel de Oliveira Monteiro, Brazilian football goalkeeper * Joel (footballer, born 1980), Joel Bertoti Padilha, Brazilian football centre-back * Joel (prophet), a prophet of ancient Israel ** Book of Joel, a book in the Jewish Tanakh, and in the Christian Bible, ascribed to the prophet * Joel, Georgia Joel is an unincorporated community in Carroll County, in the U.S. state of Georgia Georgia most commonly refers to: * Georgia (country), a country in the South Caucasus * Georgia (U.S. state), a state in the southeastern United States Geor ..., a community in the United States * Joel, Wisconsin, a community in the United States {{disambiguation, hn, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yoshihisa Okumura
Yoshihisa Okumura (; 2 July 1926 – 18 February 2023) was a Japanese engineer, known for development of radio propagation models, cellular telephone networks. 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. Professional career Okumura was born in Isikawa Prefecture on 2 July 1926. He studied electrical engineering at Kanazawa Technical College (金沢工業専門学校 Kanazawa kōgyō senmon gakkō, formerly the faculty of engineering of Kanazawa University) from 1944 to 1947. Okumura began his professional career in 1950 with Nippon Telegraph and Telephone, Nippon Telegraph and Telephone Public Corporation (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). Okumura's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
