1.
Verisign
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Verisign, Inc. com. net, and. name generic top-level domains and the. cc and. tv country-code top-level domains, and the back-end systems for the. jobs. gov, and. edu top-level domains. Verisign also offers a range of security services, including managed DNS, distributed denial-of-service attack mitigation and cyber-threat reporting. In 2010, Verisign sold its business unit – which included SSL certificate, PKI, Verisign Trust Seal. The deal capped a multi-year effort by Verisign to narrow its focus to its core infrastructure, Verisign was founded in 1995 as a spin-off of the RSA Security certification services business. The new company received licenses to key cryptographic patents held by RSA, the new company served as a certificate authority and its initial mission was providing trust for the Internet and Electronic Commerce through our Digital Authentication services and products. Those core registry functions formed the basis for Verisign’s naming division, in 2002, Verisign was charged with violation of the Securities Exchange Act. Verisign divested the Network Solutions retail business in 2003, retaining the name registry function as its core Internet addressing business. For the year ended December 31,2010, Verisign reported revenue of $681 million, verisigns share price tumbled in early 2014, hastened by the U. S. governments announcement that it would relinquish oversight of the Internets domain-naming system to a non-government entity. Ultimately the Internet Corporation for Assigned Names and Numbers chose to continue VeriSigns role as the root zone maintainer, on August 9,2010 Symantec completed its approximately $1. Verisigns core business is its naming services division, the division operates the authoritative domain name registries for two of the Internets most important top-level domains. com and. net. It is also the contracted registry operator for the. name and. gov top-level domains as well as the country code top-level domains. cc, in addition, Verisign is the primary technical subcontractor for the. edu, and. Registry operators are the wholesalers of Internet domain names, while domain name registrars act as the “retailers”, Verisign also operates two of the Internet’s thirteen root servers which are identified by the letters A-M. The root servers form the top of the hierarchical Domain Name System that supports all Internet communication, changes to the root zone were originally distributed via the A root server, but now they are distributed to all thirteen servers via a separate distribution system which Verisign maintains. Verisign is the one of the 12 root server operators to operate more than one of the thirteen root nameservers. In 2016 the Department of Commerce ended its role in managing the Internets DNS, while this initially negatively impacted VeriSigns stock, ICANN eventually chose to contract with VeriSign to continue its role as the root zone maintainer. As a result of new policies, Network Solutions divided itself into two divisions. The divisions were even geographically split with the NSI Registry moving from the headquarters in Herndon, Virginia, to nearby Dulles. In 2000, VeriSign purchased Network Solutions taking over its role in the Internet DNS, the NSI Registry division eventually became VeriSigns naming services division while the remainder of Network Solutions was later sold by VeriSign in 2003 to Pivotal Equity Group
2.
Tuvalu
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It comprises three reef islands and six true atolls spread out between the latitude of 5° to 10° south and longitude of 176° to 180°, west of the International Date Line. Tuvalu has a population of 10,640, the total land area of the islands of Tuvalu is 26 square kilometres. The first inhabitants of Tuvalu were Polynesians, in 1568, Spanish navigator Álvaro de Mendaña was the first European to sail through the archipelago, sighting the island of Nui during his expedition in search of Terra Australis. In 1819 the island of Funafuti was named Ellices Island, the name Ellice was applied to all nine islands after the work of English hydrographer Alexander George Findlay. A referendum was held in December 1974 to determine whether the Gilbert Islands, as a consequence of the referendum, the Gilbert and Ellice Islands colony ceased to exist on 1 January 1976 and the separate British colonies of Kiribati and Tuvalu came into existence. Tuvalu became fully independent within the Commonwealth on 1 October 1978, on 5 September 2000 Tuvalu became the 189th member of the United Nations. The origins of the people of Tuvalu are addressed in the theories regarding migration into the Pacific that began about 3000 years ago, during pre-European-contact times there was frequent canoe voyaging between the nearer islands including Samoa and Tonga. Eight of the nine islands of Tuvalu were inhabited, thus the name, Tuvalu, possible evidence of fire in the Caves of Nanumanga may indicate human occupation for thousands of years. The stories as to the ancestors of the Tuvaluans vary from island to island, on Niutao, Funafuti and Vaitupu the founding ancestor is described as being from Samoa, whereas on Nanumea the founding ancestor is described as being from Tonga. Mendaña made contact with the islanders but was unable to land, during Mendañas second voyage across the Pacific he passed Niulakita on 29 August 1595, which he named La Solitaria. Captain John Byron passed through the islands of Tuvalu in 1764 during his circumnavigation of the globe as captain of the Dolphin, Byron charted the atolls as Lagoon Islands. Chambers and Doug Munro identified Niutao as the island that Francisco Mourelle de la Rúa sailed past on 5 May 1781, mourelles map and journal named the island El Gran Cocal, however, the latitude and longitude was uncertain. Longitude could only be reckoned crudely as accurate chronometers were unavailable until the late 18th century, the name Ellice was applied to all nine islands after the work of English hydrographer Alexander George Findlay. In 1820 the Russian explorer Mikhail Lazarev visited Nukufetau as commander of the Mirny, Louis Isidore Duperrey, captain of La Coquille, sailed past Nanumanga in May 1824 during a circumnavigation of the earth. A Dutch expedition found Nui on the morning of 14 June 1825, whalers began roving the Pacific, although visiting Tuvalu only infrequently because of the difficulties of landing on the atolls. Captain George Barrett of the Nantucket whaler Independence II has been identified as the first whaler to hunt the waters around Tuvalu, in November 1821 he bartered coconuts from the people of Nukulaelae and also visited Niulakita. A shore camp was established on Sakalua islet of Nukufetau, where coal was used to melt down the whale blubber, the Rev. A. W. Elekana began proselytising Christianity. He was trained at Malua Theological College, a London Missionary Society school in Samoa, in 1865 the Rev. A. W. Murray of the LMS – a Protestant congregationalist missionary society – arrived as the first European missionary where he too proselytised among the inhabitants of Tuvalu
3.
Television
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Television or TV is a telecommunication medium used for transmitting moving images in monochrome, or in color, and in two or three dimensions and sound. The term can refer to a set, a television program. Television is a medium for entertainment, education, news, politics, gossip. Television became available in experimental forms in the late 1920s. After World War II, a form of black-and-white TV broadcasting became popular in the United States and Britain, and television sets became commonplace in homes, businesses. During the 1950s, television was the medium for influencing public opinion. In the mid-1960s, color broadcasting was introduced in the US, for many reasons, the storage of television and video programming now occurs on the cloud. At the end of the first decade of the 2000s, digital television transmissions greatly increased in popularity, another development was the move from standard-definition television to high-definition television, which provides a resolution that is substantially higher. HDTV may be transmitted in various formats, 1080p, 1080i, in 2013, 79% of the worlds households owned a television set. Most TV sets sold in the 2000s were flat-panel, mainly LEDs, major manufacturers announced the discontinuation of CRT, DLP, plasma, and even fluorescent-backlit LCDs by the mid-2010s. In the near future, LEDs are gradually expected to be replaced by OLEDs, also, major manufacturers have announced that they will increasingly produce smart TVs in the mid-2010s. Smart TVs with integrated Internet and Web 2.0 functions became the dominant form of television by the late 2010s, Television signals were initially distributed only as terrestrial television using high-powered radio-frequency transmitters to broadcast the signal to individual television receivers. Alternatively television signals are distributed by cable or optical fiber, satellite systems and. Until the early 2000s, these were transmitted as analog signals, a standard television set is composed of multiple internal electronic circuits, including a tuner for receiving and decoding broadcast signals. A visual display device which lacks a tuner is correctly called a video monitor rather than a television, the word television comes from Ancient Greek τῆλε, meaning far, and Latin visio, meaning sight. The Anglicised version of the term is first attested in 1907 and it was. formed in English or borrowed from French télévision. In the 19th century and early 20th century, other. proposals for the name of a technology for sending pictures over distance were telephote. The abbreviation TV is from 1948, the use of the term to mean a television set dates from 1941
4.
Video
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Video is an electronic medium for the recording, copying, playback, broadcasting, and display of moving visual media. Video systems vary greatly in the resolution of the display and refresh rate, video can be carried on a variety of media, including radio broadcast, tapes, DVDs, computer files etc. Video was originally exclusively a live technology, charles Ginsburg led an Ampex research team developing one of the first practical video tape recorder. In 1951 the first video tape recorder captured live images from television cameras by converting the electrical impulses. Video recorders were sold for $50,000 in 1956, however, prices gradually dropped over the years, in 1971, Sony began selling videocassette recorder decks and tapes into the consumer market. The use of techniques in video created digital video, which allowed higher quality and, eventually. After the invention of the DVD in 1997 and Blu-ray Disc in 2006, sales of videotape, the advent of digital broadcasting and the subsequent digital television transition is in the process of relegating analog video to the status of a legacy technology in most parts of the world. PAL standards and SECAM specify 25 frame/s, while NTSC standards specify 29.97 frames, film is shot at the slower frame rate of 24 frames per second, which slightly complicates the process of transferring a cinematic motion picture to video. The minimum frame rate to achieve a comfortable illusion of an image is about sixteen frames per second. Video can be interlaced or progressive, analog display devices reproduce each frame in the same way, effectively doubling the frame rate as far as perceptible overall flicker is concerned. NTSC, PAL and SECAM are interlaced formats, abbreviated video resolution specifications often include an i to indicate interlacing. For example, PAL video format is specified as 576i50, where 576 indicates the total number of horizontal scan lines, i indicates interlacing. In progressive scan systems, each refresh period updates all scan lines in each frame in sequence, when displaying a natively progressive broadcast or recorded signal, the result is optimum spatial resolution of both the stationary and moving parts of the image. Deinterlacing cannot, however, produce video quality that is equivalent to true progressive scan source material, aspect ratio describes the dimensions of video screens and video picture elements. All popular video formats are rectilinear, and so can be described by a ratio between width and height, the screen aspect ratio of a traditional television screen is 4,3, or about 1.33,1. High definition televisions use a ratio of 16,9. The aspect ratio of a full 35 mm film frame with soundtrack is 1.375,1. Therefore, a 720 by 480 pixel NTSC DV image displayes with the 4,3 aspect ratio if the pixels are thin, the popularity of viewing video on mobile phones has led to the growth of vertical video
5.
Internet
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The Internet is the global system of interconnected computer networks that use the Internet protocol suite to link devices worldwide. The origins of the Internet date back to research commissioned by the United States federal government in the 1960s to build robust, the primary precursor network, the ARPANET, initially served as a backbone for interconnection of regional academic and military networks in the 1980s. Although the Internet was widely used by academia since the 1980s, Internet use grew rapidly in the West from the mid-1990s and from the late 1990s in the developing world. In the two decades since then, Internet use has grown 100-times, measured for the period of one year, newspaper, book, and other print publishing are adapting to website technology, or are reshaped into blogging, web feeds and online news aggregators. The entertainment industry was initially the fastest growing segment on the Internet, the Internet has enabled and accelerated new forms of personal interactions through instant messaging, Internet forums, and social networking. Business-to-business and financial services on the Internet affect supply chains across entire industries, the Internet has no centralized governance in either technological implementation or policies for access and usage, each constituent network sets its own policies. The term Internet, when used to refer to the global system of interconnected Internet Protocol networks, is a proper noun. In common use and the media, it is not capitalized. Some guides specify that the word should be capitalized when used as a noun, the Internet is also often referred to as the Net, as a short form of network. Historically, as early as 1849, the word internetted was used uncapitalized as an adjective, the designers of early computer networks used internet both as a noun and as a verb in shorthand form of internetwork or internetworking, meaning interconnecting computer networks. The terms Internet and World Wide Web are often used interchangeably in everyday speech, however, the World Wide Web or the Web is only one of a large number of Internet services. The Web is a collection of interconnected documents and other web resources, linked by hyperlinks, the term Interweb is a portmanteau of Internet and World Wide Web typically used sarcastically to parody a technically unsavvy user. The ARPANET project led to the development of protocols for internetworking, the third site was the Culler-Fried Interactive Mathematics Center at the University of California, Santa Barbara, followed by the University of Utah Graphics Department. In an early sign of growth, fifteen sites were connected to the young ARPANET by the end of 1971. These early years were documented in the 1972 film Computer Networks, early international collaborations on the ARPANET were rare. European developers were concerned with developing the X.25 networks, in December 1974, RFC675, by Vinton Cerf, Yogen Dalal, and Carl Sunshine, used the term internet as a shorthand for internetworking and later RFCs repeated this use. Access to the ARPANET was expanded in 1981 when the National Science Foundation funded the Computer Science Network, in 1982, the Internet Protocol Suite was standardized, which permitted worldwide proliferation of interconnected networks.5 Mbit/s and 45 Mbit/s. Commercial Internet service providers emerged in the late 1980s and early 1990s, the ARPANET was decommissioned in 1990
Tuvalu