Rodae (officially RODAE Automobile Craiova S.A. , and later Daewoo Automobile Romania S.A. ) was a joint venture between S.C. Automobile Craiova S.A. and Daewoo Heavy Industries that started in 1994.
82-646: In November 1994, Daewoo opened a production line in Romania , becoming the country's most important foreign investor, by establishing a joint venture, created by Automobile Craiova and the South Korean Daewoo group. In 2006, Daewoo Automobile Craiova S.A. bought back 51% of the shares owned by the Korean company, which became 100% owned by the Romanian state. In 2008, it was sold to Ford of Europe ,
164-412: A thermionic tube or thermionic valve uses thermionic emission of electrons from a heated cathode for a number of fundamental electronic functions such as signal amplification and current rectification . The simplest vacuum tube, the diode invented in 1904 by John Ambrose Fleming , contains only a heated electron-emitting cathode and an anode. Electrons can only flow in one direction through
246-411: A radio broadcasting station , the station's large power amplifier is the transmitter and the broadcasting antenna is the interface between the power amplifier and the free space channel. The free space channel is the transmission medium and the receiver's antenna is the interface between the free space channel and the receiver. Next, the radio receiver is the destination of the radio signal, where it
328-411: A better price for their goods. In Côte d'Ivoire , coffee growers share mobile phones to follow hourly variations in coffee prices and sell at the best price. On the macroeconomic scale, Lars-Hendrik Röller and Leonard Waverman suggested a causal link between good telecommunication infrastructure and economic growth. Few dispute the existence of a correlation although some argue it is wrong to view
410-438: A caveat for it in 1876. Gray abandoned his caveat and because he did not contest Bell's priority, the examiner approved Bell's patent on March 3, 1876. Gray had filed his caveat for the variable resistance telephone, but Bell was the first to document the idea and test it in a telephone.[88] Antonio Meucci invented a device that allowed the electrical transmission of voice over a line nearly 30 years before in 1849, but his device
492-565: A company's political support. In the beginning, the Korean government instigated a series of five-year plans under which the chaebol were required to achieve a number of basic objectives. Daewoo did not become a major player until the second five-year plan. Daewoo benefited from government-sponsored cheap loans based on potential export profits. The company initially concentrated on labor-intensive clothing and textile industries that provided high profit margins because of South Korea's large and relatively inexpensive workforce. The third and fourth of
574-441: A connection between two or more users. For both types of networks, repeaters may be necessary to amplify or recreate the signal when it is being transmitted over long distances. This is to combat attenuation that can render the signal indistinguishable from the noise. Another advantage of digital systems over analogue is that their output is easier to store in memory, i.e., two voltage states (high and low) are easier to store than
656-495: A continuous range of states. Telecommunication has a significant social, cultural and economic impact on modern society. In 2008, estimates placed the telecommunication industry 's revenue at US$ 4.7 trillion or just under three per cent of the gross world product (official exchange rate). Several following sections discuss the impact of telecommunication on society. On the microeconomic scale, companies have used telecommunications to help build global business empires. This
738-508: A division of Ford Motor Company . This Romanian company–related article is a stub . You can help Misplaced Pages by expanding it . This article about an automotive industry corporation or company is a stub . You can help Misplaced Pages by expanding it . Daewoo Daewoo ( UK : / ˈ d eɪ . uː / DAY -oo ; US : / ˌ d eɪ ˈ w uː / day- WOO ; Korean : 대우 ; Hanja : 大宇 ; IPA: [tɛ.u] ; literally "great universe" and
820-406: A higher-frequency signal (known as the " carrier wave ") before transmission. There are several different modulation schemes available to achieve this [two of the most basic being amplitude modulation (AM) and frequency modulation (FM)]. An example of this process is a disc jockey's voice being impressed into a 96 MHz carrier wave using frequency modulation (the voice would then be received on
902-450: A key advantage of digital signals over analogue signals. However, digital systems fail catastrophically when noise exceeds the system's ability to autocorrect. On the other hand, analogue systems fail gracefully: as noise increases, the signal becomes progressively more degraded but still usable. Also, digital transmission of continuous data unavoidably adds quantization noise to the output. This can be reduced, but not eliminated, only at
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#1732797665993984-838: A new international frequency list and used in conformity with the Radio Regulation". According to the ITU's Radio Regulations adopted in Atlantic City, all frequencies referenced in the International Frequency Registration Board , examined by the board and registered on the International Frequency List "shall have the right to international protection from harmful interference". From a global perspective, there have been political debates and legislation regarding
1066-437: A person's age, interests, sexual preference and relationship status. In this way, these sites can play important role in everything from organising social engagements to courtship . Prior to social networking sites, technologies like short message service (SMS) and the telephone also had a significant impact on social interactions. In 2000, market research group Ipsos MORI reported that 81% of 15- to 24-year-old SMS users in
1148-467: A portmanteau of " dae " meaning great, and the given name of founder and chairman Kim Woo-choong) also known as the Daewoo Group , was a major South Korean chaebol (type of conglomerate) and automobile manufacturer. It was founded on 22 March 1967 as Daewoo Industrial and was declared bankrupt on 1 November 1999, with debts of about US$ 50 billion (equivalent to $ 91 billion in 2023). Prior to
1230-491: A radio as the channel "96 FM"). In addition, modulation has the advantage that it may use frequency division multiplexing (FDM). A telecommunications network is a collection of transmitters, receivers, and communications channels that send messages to one another. Some digital communications networks contain one or more routers that work together to transmit information to the correct user. An analogue communications network consists of one or more switches that establish
1312-475: A service that operated for a year until the gap in the telegraph link was closed. In the Middle Ages, chains of beacons were commonly used on hilltops as a means of relaying a signal. Beacon chains suffered the drawback that they could only pass a single bit of information, so the meaning of the message such as "the enemy has been sighted" had to be agreed upon in advance. One notable instance of their use
1394-411: A telephone network, the caller is connected to the person to whom they wish to talk by switches at various telephone exchanges . The switches form an electrical connection between the two users and the setting of these switches is determined electronically when the caller dials the number. Once the connection is made, the caller's voice is transformed to an electrical signal using a small microphone in
1476-412: A version of the electrical telegraph that he unsuccessfully demonstrated on September 2, 1837. His code was an important advance over Wheatstone's signaling method. The first transatlantic telegraph cable was successfully completed on July 27, 1866, allowing transatlantic telecommunication for the first time. The conventional telephone was patented by Alexander Bell in 1876. Elisha Gray also filed
1558-440: A year where the group lost a total of ₩ 550 billion (equivalent to ₩876.34 billion or US$ 775.23 million in 2017) on sales of ₩ 62 trillion (equivalent to ₩98.79 trillion or US$ 87.39 billion in 2017) . At the end of 1997, South Korea's fourth-largest chaebol had a debt of nearly five times their equity. While Samsung and LG cut back in the midst of the economic crisis, Daewoo took on 40% more debt. By 1999, Daewoo,
1640-581: Is adapted from the French, because its written use was recorded in 1904 by the French engineer and novelist Édouard Estaunié . Communication was first used as an English word in the late 14th century. It comes from Old French comunicacion (14c., Modern French communication), from Latin communicationem (nominative communication), noun of action from past participle stem of communicare, "to share, divide out; communicate, impart, inform; join, unite, participate in," literally, "to make common", from communis". At
1722-671: Is called point-to-point communication because it occurs between a transmitter and a receiver. Telecommunication through radio broadcasts is called broadcast communication because it occurs between a powerful transmitter and numerous low-power but sensitive radio receivers. Telecommunications in which multiple transmitters and multiple receivers have been designed to cooperate and share the same physical channel are called multiplex systems . The sharing of physical channels using multiplexing often results in significant cost reduction. Multiplexed systems are laid out in telecommunication networks and multiplexed signals are switched at nodes through to
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#17327976659931804-451: Is called (in the jargon of the field) " quadrature amplitude modulation " (QAM) that are used in high-capacity digital radio communication systems. Modulation can also be used to transmit the information of low-frequency analogue signals at higher frequencies. This is helpful because low-frequency analogue signals cannot be effectively transmitted over free space. Hence the information from a low-frequency analogue signal must be impressed into
1886-434: Is commonly called "keying" —a term derived from the older use of Morse Code in telecommunications—and several keying techniques exist (these include phase-shift keying , frequency-shift keying , and amplitude-shift keying ). The " Bluetooth " system, for example, uses phase-shift keying to exchange information between various devices. In addition, there are combinations of phase-shift keying and amplitude-shift keying which
1968-794: Is converted from electricity to sound. Telecommunication systems are occasionally "duplex" (two-way systems) with a single box of electronics working as both the transmitter and a receiver, or a transceiver (e.g., a mobile phone ). The transmission electronics and the receiver electronics within a transceiver are quite independent of one another. This can be explained by the fact that radio transmitters contain power amplifiers that operate with electrical powers measured in watts or kilowatts, but radio receivers deal with radio powers measured in microwatts or nanowatts . Hence, transceivers have to be carefully designed and built to isolate their high-power circuitry and their low-power circuitry from each other to avoid interference. Telecommunication over fixed lines
2050-481: Is degraded by undesirable noise . Commonly, the noise in a communication system can be expressed as adding or subtracting from the desirable signal via a random process . This form of noise is called additive noise , with the understanding that the noise can be negative or positive at different instances. Unless the additive noise disturbance exceeds a certain threshold, the information contained in digital signals will remain intact. Their resistance to noise represents
2132-425: Is now known as " Daewoo Electronics " and is focused solely on manufacturing electronics. Daewoo Electronics survives to this day, despite bankruptcy, with a new brand logo "DE", but many of the other subsidiaries and divisions have become independent or simply perished. In North America, Target stores market Daewoo Electronics products under their "Trutech" brand on an ODM basis. In 2004, General Motors pulled
2214-609: Is self-evident in the case of online retailer Amazon.com but, according to academic Edward Lenert, even the conventional retailer Walmart has benefited from better telecommunication infrastructure compared to its competitors. In cities throughout the world, home owners use their telephones to order and arrange a variety of home services ranging from pizza deliveries to electricians. Even relatively poor communities have been noted to use telecommunication to their advantage. In Bangladesh 's Narsingdi District , isolated villagers use cellular phones to speak directly to wholesalers and arrange
2296-448: Is separated from its adjacent stations by 200 kHz, and the difference between 200 kHz and 180 kHz (20 kHz) is an engineering allowance for the imperfections in the communication system. In the example above, the "free space channel" has been divided into communications channels according to frequencies , and each channel is assigned a separate frequency bandwidth in which to broadcast radio waves. This system of dividing
2378-449: Is the informational equivalent of two newspaper pages per person per day in 1986, and six entire newspapers per person per day by 2007. Given this growth, telecommunications play an increasingly important role in the world economy and the global telecommunications industry was about a $ 4.7 trillion sector in 2012. The service revenue of the global telecommunications industry was estimated to be $ 1.5 trillion in 2010, corresponding to 2.4% of
2460-725: The 1997 Asian financial crisis , Daewoo was the second largest conglomerate in South Korea after the Hyundai Group and behind Lucky-Goldstar (later became LG Corporation). There were about 20 divisions under the Daewoo Group, some of which survived as independent companies. The Daewoo Group was founded by Kim Woo-choong in March 1967. He was the son of the Provincial Governor of Daegu . He graduated from
2542-419: The 1997 Asian financial crisis , increasingly precarious relationships with the Korean government under President Kim Dae-jung , and its own poor financial management. With the Korean government in deficit, access to cheap and nearly unlimited credit was severely restricted. In 1998, when the economic crisis forced most of the chaebol to cut back, Daewoo added 14 new firms to its existing 275 subsidiaries, in
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2624-655: The Daewoo brand of vehicles out of Australia and New Zealand, citing irreparable brand damage. Later that same year, GM announced that Daewoo Motors in Europe would be rebadged as Chevrolet on 1 January 2005. In 2005, it was announced that Daewoo cars would have a Holden badge in Australia and New Zealand. In South Africa, Thailand, and the Middle East, Daewoo models were already branded Chevrolet. In South Korea, Daewoo
2706-773: The Nipkow disk by Paul Nipkow and thus became known as the mechanical television . It formed the basis of experimental broadcasts done by the British Broadcasting Corporation beginning on 30 September 1929. However, for most of the 20th century, televisions depended on the cathode ray tube invented by Karl Ferdinand Braun . The first version of such a television to show promise was produced by Philo Farnsworth and demonstrated to his family on 7 September 1927. After World War II, interrupted experiments resumed and television became an important home entertainment broadcast medium. The type of device known as
2788-440: The spark gap transmitter for radio or mechanical computers for computing, it was the invention of the thermionic vacuum tube that made these technologies widespread and practical, leading to the creation of electronics . In the 1940s, the invention of semiconductor devices made it possible to produce solid-state devices, which are smaller, cheaper, and more efficient, reliable, and durable than thermionic tubes. Starting in
2870-705: The 1932 Plenipotentiary Telegraph Conference and the International Radiotelegraph Conference in Madrid, the two organizations merged to form the International Telecommunication Union (ITU). They defined telecommunication as "any telegraphic or telephonic communication of signs, signals, writing, facsimiles and sounds of any kind, by wire, wireless or other systems or processes of electric signaling or visual signaling (semaphores)." The definition
2952-497: The 1970s. In the 1960s, Paul Baran and, independently, Donald Davies started to investigate packet switching , a technology that sends a message in portions to its destination asynchronously without passing it through a centralized mainframe . A four-node network emerged on 5 December 1969, constituting the beginnings of the ARPANET , which by 1981 had grown to 213 nodes . ARPANET eventually merged with other networks to form
3034-804: The Daewoo Motor name did not appear until 1983. The Daewoo Motor brand appeared in the UK in 1995. At the time, it was the only manufacturer not using traditional dealerships – it owned and operated its own retail network. It was once considered to be among the top 10 motor companies in terms of production. Due to financial trouble, Daewoo's automotive arm, Daewoo Motors, was sold to General Motors (Korean) in 2001. The Daewoo nameplate continued in South Korea and Vietnam until 2011. The former Daewoo facilities are now producing General Motors vehicles for Asian markets. Daewoo Commercial Vehicles Division
3116-466: The ITU was able to compile an index that measures the overall ability of citizens to access and use information and communication technologies. Using this measure, Sweden, Denmark and Iceland received the highest ranking while the African countries Niger , Burkina Faso and Mali received the lowest. Telecommunication has played a significant role in social relationships. Nevertheless, devices like
3198-744: The Internet. While Internet development was a focus of the Internet Engineering Task Force (IETF) who published a series of Request for Comments documents, other networking advancements occurred in industrial laboratories , such as the local area network (LAN) developments of Ethernet (1983), Token Ring (1984) and Star network topology. The effective capacity to exchange information worldwide through two-way telecommunication networks grew from 281 petabytes (PB) of optimally compressed information in 1986 to 471 PB in 1993 to 2.2 exabytes (EB) in 2000 to 65 EB in 2007. This
3280-601: The Kyonggi High School, then finished with an Economics Degree at Yonsei University in Seoul . During the 1960s, after the end of the Syngman Rhee government, the new government of Park Chung Hee intervened to promote growth and development in the country. It increased access to resources, promoted exports, financed industrialization, and provided protection from competition to the chaebol in exchange for
3362-506: The United Kingdom had used the service to coordinate social arrangements and 42% to flirt. In cultural terms, telecommunication has increased the public's ability to access music and film. With television, people can watch films they have not seen before in their own home without having to travel to the video store or cinema. With radio and the Internet, people can listen to music they have not heard before without having to travel to
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3444-797: The United States was spent on media that depend upon telecommunication. Many countries have enacted legislation which conforms to the International Telecommunication Regulations established by the International Telecommunication Union (ITU), which is the "leading UN agency for information and communication technology issues". In 1947, at the Atlantic City Conference, the ITU decided to "afford international protection to all frequencies registered in
3526-486: The automotive industry and was ranked as the seventh largest car exporter and the sixth largest car manufacturer in the world. Throughout this period, Daewoo experienced great success at turning around faltering companies in South Korea. In the 1980s and early 1990s, the Daewoo Group also produced consumer electronics, computers, telecommunication products, construction equipment, buildings, and musical instruments. Daewoo Group ran into deep financial trouble in 1998 due to
3608-511: The chaebol to be more aggressive abroad. Daewoo responded by establishing a number of joint ventures with U.S. and European companies. It expanded exports of machine tools, defense products (under the S&;T Daewoo company), aerospace interests, and semiconductor design and manufacturing. Eventually, it began to build civilian helicopters and airplanes, priced considerably cheaper than those produced by its U.S. counterparts. It also expanded efforts in
3690-437: The correct destination terminal receiver. Communications can be encoded as analogue or digital signals , which may in turn be carried by analogue or digital communication systems. Analogue signals vary continuously with respect to the information, while digital signals encode information as a set of discrete values (e.g., a set of ones and zeroes). During propagation and reception, information contained in analogue signals
3772-794: The country . During explorations in 2008, Daewoo found one of the largest gas fields in southeast Asia , the Shwe offshore field, in the Bay of Bengal , about 100 km off Sittwe . The field went into production in 2013. Daewoo Group had under its umbrella several major corporations: A further subsidiary was the Daewoo Development Company, funded by cash from the Group and set up to develop hotels. Seven were built in South Korea, China, Vietnam, and Africa. They were personally designed and furnished by Kim Woo-jung's socialite wife Heeja, who
3854-636: The country, according to South Korea's Yonhap News Agency. On 30 May 2006, Kim was sentenced to 10 years in prison after being convicted of fraud and embezzlement. On the last day of the trial, Kim tearfully addressed the court, "I cannot dodge my responsibility of wrongly buttoning up the final button of fate." The group was reorganized into three separate parts: Daewoo Corporation , Daewoo Engineering & Construction and Daewoo International Corporation . They are active in many markets, most significantly in steel processing, ship building and financial services. The corporate entity known as "Daewoo Corporation"
3936-500: The definition. Many transmission media have been used for telecommunications throughout history, from smoke signals , beacons , semaphore telegraphs , signal flags , and optical heliographs to wires and empty space made to carry electromagnetic signals. These paths of transmission may be divided into communication channels for multiplexing , allowing for a single medium to transmit several concurrent communication sessions . Several methods of long-distance communication before
4018-519: The development of optical fibre. The Internet , a technology independent of any given medium, has provided global access to services for individual users and further reduced location and time limitations on communications. Telecommunication is a compound noun of the Greek prefix tele- (τῆλε), meaning distant , far off , or afar , and the Latin verb communicare , meaning to share . Its modern use
4100-537: The device—from the cathode to the anode. Adding one or more control grids within the tube enables the current between the cathode and anode to be controlled by the voltage on the grid or grids. These devices became a key component of electronic circuits for the first half of the 20th century and were crucial to the development of radio, television, radar, sound recording and reproduction , long-distance telephone networks, and analogue and early digital computers . While some applications had used earlier technologies such as
4182-422: The electrical telegraph, the last commercial line was abandoned in 1880. On July 25, 1837, the first commercial electrical telegraph was demonstrated by English inventor Sir William Fothergill Cooke and English scientist Sir Charles Wheatstone . Both inventors viewed their device as "an improvement to the [existing] electromagnetic telegraph" and not as a new device. Samuel Morse independently developed
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#17327976659934264-403: The expense of increasing the channel bandwidth requirement. The term "channel" has two different meanings. In one meaning, a channel is the physical medium that carries a signal between the transmitter and the receiver. Examples of this include the atmosphere for sound communications, glass optical fibres for some kinds of optical communications , coaxial cables for communications by way of
4346-458: The first decade of the 20th century, a revolution in wireless communication began with breakthroughs including those made in radio communications by Guglielmo Marconi , who won the 1909 Nobel Prize in Physics . Other early pioneers in electrical and electronic telecommunications include co-inventors of the telegraph Charles Wheatstone and Samuel Morse , numerous inventors and developers of
4428-400: The five-year plans occurred from 1973 to 1981. During this period, the country's labor force was in high demand. Competition from other countries began eroding South Korea's competitive edge. The government responded to this change by concentrating its efforts on mechanical and electrical engineering, shipbuilding, petrochemicals, construction, and military initiatives. At the end of this period,
4510-483: The government forced Daewoo into shipbuilding. Kim was reluctant to enter this industry, but Daewoo soon earned a reputation for producing competitively priced ships and oil rigs. During the next decade, the Korean government became more liberal in its economic policies. Small private companies were encouraged, protectionist import restrictions were loosened, and the government reduced positive discrimination ( affirmative action ), to encourage free market trade and to force
4592-431: The importance of social conversations and staying connected to family and friends. Since then the role that telecommunications has played in social relations has become increasingly important. In recent years, the popularity of social networking sites has increased dramatically. These sites allow users to communicate with each other as well as post photographs, events and profiles for others to see. The profiles can list
4674-552: The management of telecommunication and broadcasting. The history of broadcasting discusses some debates in relation to balancing conventional communication such as printing and telecommunication such as radio broadcasting. The onset of World War II brought on the first explosion of international broadcasting propaganda. Countries, their governments, insurgents, terrorists, and militiamen have all used telecommunication and broadcasting techniques to promote propaganda. Patriotic propaganda for political movements and colonization started
4756-567: The medium into channels according to frequency is called " frequency-division multiplexing ". Another term for the same concept is " wavelength-division multiplexing ", which is more commonly used in optical communications when multiple transmitters share the same physical medium. Another way of dividing a communications medium into channels is to allocate each sender a recurring segment of time (a "time slot", for example, 20 milliseconds out of each second), and to allow each sender to send messages only within its own time slot. This method of dividing
4838-414: The medium into communication channels is called " time-division multiplexing " ( TDM ), and is used in optical fibre communication. Some radio communication systems use TDM within an allocated FDM channel. Hence, these systems use a hybrid of TDM and FDM. The shaping of a signal to convey information is known as modulation . Modulation can be used to represent a digital message as an analogue waveform. This
4920-742: The mid-1930s. In 1936, the BBC broadcast propaganda to the Arab World to partly counter similar broadcasts from Italy, which also had colonial interests in North Africa. Modern political debates in telecommunication include the reclassification of broadband Internet service as a telecommunications service (also called net neutrality ), regulation of phone spam , and expanding affordable broadband access. According to data collected by Gartner and Ars Technica sales of main consumer's telecommunication equipment worldwide in millions of units was: In
5002-596: The mid-1960s, thermionic tubes were replaced with the transistor . Thermionic tubes still have some applications for certain high-frequency amplifiers. On 11 September 1940, George Stibitz transmitted problems for his Complex Number Calculator in New York using a teletype and received the computed results back at Dartmouth College in New Hampshire . This configuration of a centralized computer ( mainframe ) with remote dumb terminals remained popular well into
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#17327976659935084-544: The mid-2010s. It was progressively phased out and replaced by Chevrolet or Ravon . The Daewoo commercial vehicle manufacturer was taken over by Tata Motors . Daewoo also moved into the oil and gas industry. While Western oil and gas companies were unwilling to conduct business in Myanmar , Daewoo is one of three oil companies, along with the French company TotalEnergies and the American company Unocal , operating in
5166-429: The modern era used sounds like coded drumbeats , the blowing of horns , and whistles . Long-distance technologies invented during the 20th and 21st centuries generally use electric power, and include the telegraph , telephone , television , and radio . Early telecommunication networks used metal wires as the medium for transmitting signals. These networks were used for telegraphy and telephony for many decades. In
5248-452: The music store. Telecommunication has also transformed the way people receive their news. A 2006 survey (right table) of slightly more than 3,000 Americans by the non-profit Pew Internet and American Life Project in the United States the majority specified television or radio over newspapers. Telecommunication has had an equally significant impact on advertising. TNS Media Intelligence reported that in 2007, 58% of advertising expenditure in
5330-400: The neighbourhood of 94.5 MHz (megahertz) while another radio station can simultaneously broadcast radio waves at frequencies in the neighbourhood of 96.1 MHz. Each radio station would transmit radio waves over a frequency bandwidth of about 180 kHz (kilohertz), centred at frequencies such as the above, which are called the "carrier frequencies" . Each station in this example
5412-515: The presence or absence of an atmosphere between the two. Radio waves travel through a perfect vacuum just as easily as they travel through air, fog, clouds, or any other kind of gas. The other meaning of the term "channel" in telecommunications is seen in the phrase communications channel , which is a subdivision of a transmission medium so that it can be used to send multiple streams of information simultaneously. For example, one radio station can broadcast radio waves into free space at frequencies in
5494-709: The relationship as causal. Because of the economic benefits of good telecommunication infrastructure, there is increasing worry about the inequitable access to telecommunication services amongst various countries of the world—this is known as the digital divide . A 2003 survey by the International Telecommunication Union (ITU) revealed that roughly a third of countries have fewer than one mobile subscription for every 20 people and one-third of countries have fewer than one land-line telephone subscription for every 20 people. In terms of Internet access, roughly half of all countries have fewer than one out of 20 people with Internet access. From this information, as well as educational data,
5576-604: The second largest conglomerate in South Korea with interests in about 100 countries, went bankrupt, with debts of about US$ 50 billion (equivalent to $ 91 billion in 2023). Soon after the demise, Kim Woo-choong fled to Vietnam, and former Daewoo factory workers put up wanted posters with his picture. Kim returned to Korea in June 2005 and was promptly arrested. He was charged with masterminding accounting fraud of 41 trillion won (US$ 43.4 billion), illegally borrowing 9.8 trillion won (US$ 10.3 billion), and smuggling US$ 3.2 billion out of
5658-516: The telephone including Antonio Meucci , Philipp Reis , Elisha Gray and Alexander Graham Bell , inventors of radio Edwin Armstrong and Lee de Forest , as well as inventors of television like Vladimir K. Zworykin , John Logie Baird and Philo Farnsworth . Since the 1960s, the proliferation of digital technologies has meant that voice communications have gradually been supplemented by data. The physical limitations of metallic media prompted
5740-412: The telephone system were originally advertised with an emphasis on the practical dimensions of the device (such as the ability to conduct business or order home services) as opposed to the social dimensions. It was not until the late 1920s and 1930s that the social dimensions of the device became a prominent theme in telephone advertisements. New promotions started appealing to consumers' emotions, stressing
5822-631: The then-newly discovered phenomenon of radio waves , demonstrating, by 1901, that they could be transmitted across the Atlantic Ocean. This was the start of wireless telegraphy by radio. On 17 December 1902, a transmission from the Marconi station in Glace Bay, Nova Scotia, Canada , became the world's first radio message to cross the Atlantic from North America. In 1904, a commercial service
5904-490: The voltages and electric currents in them, and free space for communications using visible light , infrared waves, ultraviolet light , and radio waves . Coaxial cable types are classified by RG type or "radio guide", terminology derived from World War II. The various RG designations are used to classify the specific signal transmission applications. This last channel is called the "free space channel". The sending of radio waves from one place to another has nothing to do with
5986-492: The wartime purposes of aircraft and land communication, radio navigation, and radar. Development of stereo FM broadcasting of radio began in the 1930s in the United States and the 1940s in the United Kingdom, displacing AM as the dominant commercial standard in the 1970s. On March 25, 1925, John Logie Baird demonstrated the transmission of moving pictures at the London department store Selfridges . Baird's device relied upon
6068-418: The world's gross domestic product (GDP). Modern telecommunication is founded on a series of key concepts that experienced progressive development and refinement in a period of well over a century: Telecommunication technologies may primarily be divided into wired and wireless methods. Overall, a basic telecommunication system consists of three main parts that are always present in some form or another: In
6150-450: Was chairwoman of the company. The most lavish is the 5-star Hanoi Daewoo Hotel, which cost US$ 163 million to build in 1996 and was decorated by Heeja with fine art, porcelain, sculptures, and marble. She invited 3,000 guests to the opening, including Russian President Vladimir Putin . Kim is believed to have spent time there while "on the run". Daewoo Motor Co., Ltd. was founded when the Daewoo Group purchased Saehan Motor in 1978, but
6232-490: Was during the Spanish Armada , when a beacon chain relayed a signal from Plymouth to London . In 1792, Claude Chappe , a French engineer, built the first fixed visual telegraphy system (or semaphore line ) between Lille and Paris. However semaphore suffered from the need for skilled operators and expensive towers at intervals of ten to thirty kilometres (six to nineteen miles). As a result of competition from
6314-407: Was established to transmit nightly news summaries to subscribing ships, which incorporated them into their onboard newspapers. World War I accelerated the development of radio for military communications . After the war, commercial radio AM broadcasting began in the 1920s and became an important mass medium for entertainment and news. World War II again accelerated the development of radio for
6396-471: Was later reconfirmed, according to Article 1.3 of the ITU Radio Regulations , which defined it as "Any transmission , emission or reception of signs, signals, writings, images and sounds or intelligence of any nature by wire , radio, optical, or other electromagnetic systems". Homing pigeons have been used throughout history by different cultures. Pigeon post had Persian roots and
6478-676: Was later used by the Romans to aid their military. Frontinus claimed Julius Caesar used pigeons as messengers in his conquest of Gaul . The Greeks also conveyed the names of the victors at the Olympic Games to various cities using homing pigeons. In the early 19th century, the Dutch government used the system in Java and Sumatra . And in 1849, Paul Julius Reuter started a pigeon service to fly stock prices between Aachen and Brussels ,
6560-486: Was of little practical value because it relied on the electrophonic effect requiring users to place the receiver in their mouths to "hear". The first commercial telephone services were set up by the Bell Telephone Company in 1878 and 1879 on both sides of the Atlantic in the cities of New Haven and London. In 1894, Italian inventor Guglielmo Marconi began developing a wireless communication using
6642-555: Was renamed GM Korea. As part of the company reorganization, the content and the structure of its brand portfolio (its brand architecture) was reorganized. In 2011, GM discontinued the Daewoo brand name in South Korea and Vietnam and replaced it with the Chevrolet brand. The brand stayed used by GM in various CIS countries where it had a strong presence such as Belarus , Tajikistan , Moldova , Kazakhstan and Uzbekistan until
6724-415: Was sold to Tata Motors . As of September 2022, companies that remain with the "Daewoo" brand name are: Telecommunication Telecommunication , often used in its plural form or abbreviated as telecom , is the transmission of information with an immediacy comparable to face-to-face communication. As such, slow communications technologies like postal mail and pneumatic tubes are excluded from
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