In what follows there is a brief description of the principal biometric technologies, whose respective proponents - producers, research laboratories, think tanks - mostly tend to claim superiority over the others. A frequently used definition of "biometric" is that of a "unique, measurable characteristic or trait of a human being for automatically recognizing or verifying identity" (
All biometric technologies are made up of the same basic processes:
1. A sample of a biometric is first collected, then transformed into digital information and stored as the "biometric template" of the person in question.
2. At every new identification, a second sample is collected and its identity with the first one is examined.
3. If the two samples are identical, the persons identity is confirmed, i.e. the system knows who the person is.
This means that access to the facility or resource can be granted or denied. It also means that information about the persons behaviour and movements has been collected. The system now knows who passed a certain identification point at which time, at what distance from the previous time, and it can combine these data with others, thereby appropriating an individual's data body.
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During the cold war the U.S. tried to ensure that it would stay ahead of the Soviet Union in technological advancements. Therefore in 1963 the
In the 1960s and 1970s a multitude of AI programs were developed, most notably SHRDLU. Headed by Marvin Minsky the MIT's research team showed, that when confined to a small subject matter, computer programs could solve spatial and logic problems. Other progresses in the field of AI at the time were: the proposal of new theories about
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Thinking of propaganda some politicians' names are at once remembered, like
The history of propaganda has to tell then merely mentioning those names:
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Although fingerprinting smacks of police techniques used long before the dawn of the information age, its digital successor finger scanning is the most widely used biometric technology. It relies on the fact that a fingerprint's uniqueness can be defined by analysing the so-called "minutiae" in somebody's fingerprint. Minutae include sweat pores, distance between ridges, bifurcations, etc. It is estimated that the likelihood of two individuals having the same fingerprint is less than one in a billion.
As an access control device, fingerprint scanning is particularly popular with military institutions, including the Pentagon, and military research facilities. Banks are also among the principal users of this technology, and there are efforts of major credit card companies such as Visa and MasterCard to incorporate this finger print recognition into the bank card environment.
Problems of inaccuracy resulting from oily, soiled or cracked skins, a major impediment in fingerprint technology, have recently been tackled by the development a contactless capturing device (
As in other biometric technologies, fingerprint recognition is an area where the "criminal justice" market meets the "security market", yet another indication of civilian spheres becomes indistinguishable from the military. The utopia of a prisonless society seems to come within the reach of a technology capable of undermining freedom by an upward spiral driven by identification needs and identification technologies.
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In the summer of 1999 between 1.200 and 2.000 Muslim rebels from Chechnya fell into Dagestan. Rumors say that Russian soldiers closed their eyes pretending not to see anything. During the fightings that started soon, many persons got killed. The hole issue was blamed on Chechnya.
At that time there were rumors that there would be heavy bombing in Moscow in September. And there was. Those two things together brought back the hatred against the Chechnya rebels. The 2nd War between Russia and the Muslim country began. While the first war was lost at home, because the Russians, especially mothers, did not understand why their sons should fight against Chechnya, this time the atmosphere was completely different. In the cities 85% and all over Russia 65% of the Russian population agreed with the war. This time the war was a national issue, a legitimate defense.
The media emphasized this.
Alexander Zilin, a journalist, found out that the truth was far from the one presented in the media: First of all there was no evidence that the Moscow-bombings were organized by Chechnyans. On the contrary it is more than probable that the crimes were organized by a governmental institution for national security. The disinformation was part of the strategy to make the population support another war with Chechnya. The media were part of the story, maybe without knowing. They kept on the government's and army's side, showing only special and patriotic parts of the war. For example the number of dead Russian soldiers was held back.
The U.S.-behavior on this:
The USA would like to intervene but they are afraid of ruining the weak relation to Russia. For years the main topic of U.S.-politics has been the struggle against terrorism. Now Russia pretends to be fighting terrorism. How could it be criticized for that?
The reason for this war is rather cynical: it worked as a public relations-campaign for
At the same time a propaganda-campaign against his rival Y. Primakov (98), formerly the most popular candidate, was spreading lies and bad rumors. Opinion-polls showed very fast that he had lost the elections because of this black propaganda, even before the elections took place.
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Public relations usually is associated with the influencing of public opinion. Therefore it has subsequently been linked with propaganda. Using one of the many definitions of propaganda "... the manipulation of symbols as a means of influencing attitudes on controversial matters" (Harold D. Lasswell), the terms propaganda and PR seem to be easily interchangeable.
Still many authors explicitly distinguish between public relations, advertising and propaganda. Unlike PR, which is often described as objective and extensive information of the public, advertising and propaganda are associated with manipulative activities. Nevertheless to treat public relations and propaganda as equivalents stands in the tradition of PR.
Also institutions like the
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In order to be able to recognize a person, one commonly looks at this persons face, for it is there where the visual features which distinguish one person from another are concentrated. Eyes in particular seem to tell a story not only about who somebody is, but also about how that persons feel, where his / her attention is directed, etc. People who do not want to show who they are or what is going on inside of them must mask themselves. Consequently, face recognition is a kind of electronic unmasking.
"Real" face-to-face communication is a two-way process. Looking at somebody's face means exposing ones own face and allowing the other to look at oneself. It is a mutual process which is only suspended in extraordinary and voyeuristic situations. Looking at somebody without being looked at places the person who is visually exposed in a vulnerable position vis-à-vis the watcher.
In face recognition this extraordinary situation is normal. Looking at the machine, you only see yourself looking at the machine. Face biometrics are extracted anonymously and painlessly by a mask without a face.
Therefore the resistance against the mass appropriation of biometrical data through surveillance cameras is confronted with particular difficulties. The surveillance structure is largely invisible, it is not evident what the function of a particular camera is, nor whether it is connected to a face recognition system.
In a protest action against the face recognition specialist
According to
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The secret behind all this is the conception that nothing bad could ever be referred to the own nation. All the bad words belong to the enemy, whereas the "we" is the good one, the one who never is the aggressor but always defender, the savior - not only for ones own sake but also for the others, even if they never asked for it, like the German population during World War I and II.
The spiritualization of such thinking leads to the point that it gets nearly impossible to believe that this could be un-true, a fake. To imagine injustice committed by the own nation gets more and more difficult, the longer the tactic of this kind of propaganda goes on. U.S.-Americans voluntarily believe in its politics, believing also the USA works as the police of the world, defending the morally good against those who just do not have reached the same level of civilization until today.
To keep up this image, the enemy must be portrayed ugly and bad, like in fairy-tales, black-and-white-pictures. Any connection between oneself and the enemy must be erased and made impossible. In the case of
All of this is no invention of several politicians. Huge think tanks and different governmental organizations are standing behind that. Part of their work is to hide their own work, or to deny it.
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Traditional copyright and the practice of paying
Yet again new technologies have altered the way of how (copyrighted) works are produced, copied, made obtainable and distributed. The emergence of global electronic networks and the increased availability of digitalized intellectual property confront existing copyright with a variety of questions and challenges. Although the combination of several types of works within one larger work or on one data carrier, and the digital format (although this may be a recent development it has been the object of detailed legal scrutiny), as well as networking (telephone and cable networks have been in use for a long time, although they do not permit interactivity) are nothing really new, the circumstance that recent technologies allow the presentation and storage of text, sound and visual information in digital form indeed is a novel fact. Like that the entire information can be generated, altered and used by and on one and the same device, irrespective of whether it is provided online or offline.
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Another important multilateral treaty concerned with
The complete TRIPS agreement can be found on:
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The internet can be regarded as a mirror of the variety of interests, attitudes and needs of human kind. Propaganda and disinformation in that way have to be part of it, whether they struggle for something good or evil. But the classifications do no longer function.
During the last years the internet opened up a new source for racism as it can be difficult to find the person who gave a certain message into the net. The anarchy of the internet provides racists with a lot of possibilities to reach people which they do not possess in other media, for legal and other reasons.
In the 1980s racist groups used mailboxes to communicate on an international level; the first ones to do so were supposedly the
A complete network of anti-racist organizations, including a high number of websites are fighting against racism. For example:
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"In wartime they attack a part of the body that other weapons cannot reach in an attempt to affect the way which participants perform on the field of battle." (
Therefore the demonstrated tools refer to political propaganda in the two World Wars.
Propaganda has the ability to change a war, a natural evil, into a so-called "just" war. Violence then is supposedly defense, no more aggression.
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Following the commercial success of
New technologies were being invented in Japan.
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With the rise of networks and the corresponding decline of mainframe services computers have become communication devices instead of being solely computational or typewriter-like devices. Corporate networks become increasingly important and often use the Internet as a public service network to interconnect. Sometimes they are
Software companies, consulting agencies, and journalists serving their interests make some further differences by splitting up the easily understandable term
Cable TV networks and online services as
Especially for financial transactions, secure proprietary networks become increasingly important. When you transfer funds from your banking account to an account in another country, it is done through the SWIFT network, the network of the
Electronic Communications Networks as
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The Romans can be called the great inventors of myths with the purpose of propaganda. Think of
Or Augustus: he reunited the Roman Empire; part of his power was due to huge efforts in propaganda, visible e.g. in the mass of coins showing his face, being sent all over the empire. He understood very well, that different cultures used different symbols - and he used them for his propaganda.
Politically the Roman army was an important factor. Propaganda in that case was used for the soldiers on the one hand, but on the other hand also for demonstrating the power of the army to the people, so they could trust in its strength. Even then security was an essential factor of politics. As long as the army functioned, the Roman Empire did as well (
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Never before propaganda had been as important as in the 2nd World War. From now on education was one more field of propaganda: its purpose was to teach how to think, while pure propaganda was supposed to show what to think.
Every nation founded at least one ministry of propaganda - of course without calling it that way. For example the British called it the Ministry of Information (= MOI), the U.S. distinguished between the Office of Strategic Services (= OSS) and the Office of War Information (= OWI), the Germans created a Ministry of Propaganda and Public Enlightenment (= RMVP) and the Japanese called their disinformation and propaganda campaign the "Thought War".
British censorship was so strict that the text of an ordinary propaganda leaflet, that had been dropped from planes several million times, was not given to a journalist who asked for it.
Atrocity stories were no longer used the same way as in the 1st World War. Instead,
German war propaganda had started long before the war. In the middle of the 1930s
Some of the pictures of fear, hatred and intolerance still exist in people's heads. Considering this propaganda did a good job, unfortunately it was the anti-national-socialist propaganda that failed at that time.
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Copyright protection generally means that certain uses of a work are lawful only if they are done with the authorization of the owner of the copyright. The most typical are the following:
- copying or reproducing a work
- performing a work in public
- making a sound recording of a work
- making a motion picture of a work
- broadcasting a work
- translating a work
- adapting a work
Under certain national laws, some of these rights, which are referred to, as "economic rights'" are not exclusive rights of authorization but in specific cases, merely rights to remuneration. Some strictly determined uses (for example quotations or the use of works by way of illustration for teaching) are completely free, that is, they require neither authorization of, nor remuneration for, the owner of the copyright. This practice is described as
In addition to economic rights, authors enjoy "moral rights" on the basis of which they have the right to claim their authorship and require that their names be indicated on the copies of the work and in connection with other uses thereof. They also have the right to oppose the mutilation or deformation of their creations.
The owner of a copyright may usually transfer his right or may license certain uses of his work. Moral rights are generally inalienable and remain with the creator even after he has transferred his economic rights, although the author may waive their exercise.
Furthermore there exist rights related to copyright that are referred to as "neighboring rights". In general there are three kinds of neighboring rights: 1) the rights of performing artists in their performances, 2) the rights of producers of phonograms in their phonograms, and 3) the rights of broadcasting organizations in their radio and television programs. Neighboring rights attempt to protect those who assist intellectual creators to communicate their message and to disseminate their works to the public at large.
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Since the invention of appropriate means and technologies, communication no longer requires face-to-face meetings.
From writing and reading to using computers, expanding and exhausting one's possibilities to communicate relies more and more on the application of skills we have to learn. With the increasing importance of communication technologies, learning to apply them properly becomes a kind of rite of passage.
A Small World
From the very beginning - the first Sumerian pictographs on clay tablets - to today's state of the art technologies - broadband communication via
Since the invention of the electrical telegraph, but especially with today's growing digital communication networks, every location on earth seems to be close, however distant it may be, and also time no longer remains a significant dimension.
Threatened Cultural Memory
More and more information is transmitted and produced faster and faster, but the shelf life of information becomes more and more fragile. For more than 4500 years Sumerian pictographs written on clay tablets remained intact, but newspapers and books, printed some decades ago, crumble into pieces; film reels, video tapes and cassettes corrode. Digitalization of information is not a cure; on the contrary it even intensifies the danger of destroying cultural heritage. Data increasingly requires specific software and hardware, but to regularly convert all available digitized information is an unexecutable task.
Compared to the longevity of pictographs on clay tablets, digitized information is produced for instant one-time use. The increasing production and processing of information causes a problem hitherto unknown: the loss of our cultural memory.
For further information see
For another history of communication systems see
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During the 1940s and 1950s two major developments enabled the design of modern
Numerical control was invented during the late 1940s and early 1950s. It is a method of controlling machine tool axes by means of numbers that have been coded on media. The first numerical control machine was presented in 1952 at the
First teleoperators were developed in the early 1940s. Teleoperators are mechanical manipulators which are controlled by a human from a remote location. In its typical application a human moves a mechanical arm and hand with its moves being duplicated at another location.
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2000
Digital technologies are used to combine previously separated communication and media systems such as telephony, audiovisual technologies and computing to new services and technologies, thus forming extensions of existing communication systems and resulting in fundamentally new communication systems. This is what is meant by today's new buzzwords "multimedia" and "convergence".
Classical dichotomies as the one of computing and telephony and traditional categorizations no longer apply, because these new services no longer fit traditional categories.
Convergence and Regulatory Institutions
Digital technology permits the integration of telecommunications with computing and audiovisual technologies. New services that extend existing communication systems emerge. The convergence of communication and media systems corresponds to a convergence of corporations. Recently,
For further information on this issue see Natascha Just and Michael Latzer, The European Policy Response to Convergence with Special Consideration of Competition Policy and Market Power Control, http://www.soe.oeaw.ac.at/workpap.htm or
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The dream of a conflict-free capitalism appeals to a diverse audience. No politician can win elections without eulogising the benefits of the information society and promising universal wealth through informatisation. "Europe must not lose track and should be able to make the step into the new knowledge and information society in the 21st century", said Tony Blair.
The US government has declared the construction of a fast information infrastructure network the centerpiece of its economic policies
In Lisbon the EU heads of state agreed to accelerate the informatisation of the European economies
The German Chancellor Schröder has requested the industry to create 20,000 new informatics jobs.
The World Bank understands information as the principal tool for third world development
Electronic classrooms and on-line learning schemes are seen as the ultimate advance in education by politicians and industry leaders alike.
But in the informatised economies, traditional exploitative practices are obscured by the glamour of new technologies. And the nearly universal acceptance of the ICT message has prepared the ground for a revival of 19th century "adapt-or-perish" ideology.
"There is nothing more relentlessly ideological than the apparently anti-ideological rhetoric of information technology"
(Arthur and Marilouise Kroker, media theorists)
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Disinformation is supposed to be something evil, something ethically not correct. And therefore we prefer to connect it to the past or to other political systems than the ones in the Western hemisphere. It is always the others who work with disinformation. The same is true for propaganda.
Even better, if we can refer it to the past:
A war loses support of the people, if it is getting lost. Therefore it is extremely important to launch a feeling of winning the war. Never give up emotions of victory. Governments know this and work hard on keeping the mood up. The Germans did a very hard job on that in the last months of World War II.
But the in the 1990s disinformation- and propaganda-business came back to life (if it ever had gone out of sight) through Iraq's invasion of Kuwait and the reactions by democratic states. After the war, reports made visible that not much had happened the way we had been told it had happened. Regarded like this the Gulf War was the end of the
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American corporation that was the world's largest automotive manufacturer and perhaps the largest industrial corporation throughout most of the 20th century. It was founded in 1908 to consolidate several motorcar companies and today operates manufacturing and assembly plants and distribution centers throughout the United States and Canada and many other countries. Its major products include automobiles and trucks, a wide range of automotive components, engines, and defense and aerospace material. In 1996 it sold Electronic Data Systems, and in 1997 it sold the defense units of its Hughes Electronics subsidiary to the Raytheon Company, thus leaving the computer-services and defense-aerospace fields in order to concentrate on its automotive businesses. The company's headquarters are in Detroit, Michigan.
This document, intended as a reliable electronic reference tool, provides a timeline for three types of developments and milestones: (1) advances in long distance person-to-person communication; (2) advances in storage, replication, cataloguing, finding, and retrieval of data; and (3) standardization of concepts and tools for long distance interaction.
The advancements may have a technical (hardware), conceptual (software), or an organizational aspect, or represent an important milestone in the history of a given invention, and are annotated as such in the timeline.
The period covered ranges from 30000 BC up to now.
http://www.ciolek.com/PAPERS/milestones.html
Based at the University of California's San Diego Supercomputer Center, CAIDA supports cooperative efforts among the commercial, government and research communities aimed at promoting a scalable, robust Internet infrastructure. It is sponsored by the
Born 1891 in Vienna, Bernays was one of the founders of modern public relations. An enigmatic character, he was a master of mise en scène with far-reaching contacts in the world of business and politics. The nephew of Sigmund Freund and related with Heinrich Heine, he was also among the first to pursue PR for governments and to produce pseudo-events. Bernays considered the manipulation of public opinion as an important element of mass democracies and was of the opinion that only through PR a society's order can be kept.
b. December 26, 1791, London, England
d. October 18, 1871, London, England
English mathematician and inventor who is credited with having conceived the first automatic digital computer. The idea of mechanically calculating mathematical tables first came to Babbage in 1812 or 1813. Later he made a small
The firm began in Germany in 1835, when Carl Bertelsmann founded a religious print shop and publishing establishment in the Westphalian town of Gütersloh. The house remained family-owned and grew steadily for the next century, gradually adding literature, popular fiction, and theology to its title list. Bertelsmann was shut down by the Nazis in 1943, and its physical plant was virtually destroyed by Allied bombing in 1945. The quick growth of the Bertelsmann empire after World War II was fueled by the establishment of global networks of book clubs (from 1950) and music circles (1958). By 1998 Bertelsmann AG comprised more than 300 companies concentrated on various aspects of media. During fiscal year 1997-98, Bertelsmann earned more than US$15 billion in revenue and employed 58.000 people, of whom 24.000 worked in Germany.
Saddam Hussein joined the revolutionary Baath party when he was a university student. In 1958 he had the head of Iraq, Abdul-Karim Qassim, killed. Since 1979 he has been President of Iraq. Under his reign Iraq fought a decade-long war with Iran. Because of his steady enmity with extreme Islamic leaders the West supported him first of all, until his army invaded Kuwait in August 1990, an incident that the USA led to the Gulf War. Since then many rumors about a coup d'état have been launched, but Saddam Hussein is still in unrestricted power.
Agostino Ramelli designed a "reading wheel" which allowed browsing through a large number of documents without moving from one spot.
Presenting a large number of books, a small library, laid open on lecterns on a kind of ferry-wheel, allowing us to skip chapters and to browse through pages by turning the wheel to bring lectern after lectern before our eyes, thus linking ideas and texts together, Ramelli's reading wheel reminds of today's browsing software used to navigate the
b. Nov. 2, 1815, Lincoln, Lincolnshire, England
d. Dec. 8, 1864, Ballintemple, County Cork, Ireland
English mathematician who helped establish modern symbolic logic and whose algebra of logic, now called Boolean algebra, is basic to the design of digital computer circuits. One of the first Englishmen to write on logic, Boole pointed out the analogy between the algebraic symbols and those that can represent logical forms and syllogisms, showing how the symbols of quantity can be separated from those of operation. With Boole in 1847 and 1854 began the algebra of logic, or what is now called Boolean algebra. It is basically two-valued in that it involves a subdivision of objects into separate classes, each with a given property. Different classes can then be treated as to the presence or absence of the same property.
Writing and calculating came into being at about the same time. The first pictographs carved into clay tablets are used for administrative purposes. As an instrument for the administrative bodies of early empires, who began to rely on the collection, storage, processing and transmission of data, the skill of writing was restricted to a few. Being more or less separated tasks, writing and calculating converge in today's computers.
Letters are invented so that we might be able to converse even with the absent, says Saint Augustine. The invention of writing made it possible to transmit and store information. No longer the ear predominates; face-to-face communication becomes more and more obsolete for administration and bureaucracy. Standardization and centralization become the constituents of high culture and vast empires as Sumer and China.
Leni Riefenstahl (* 1902) began her career as a dancer and actress. Parallel she learnt how to work with a camera, turning out to be one of the most talented directors and cutters of her time - and one of the only female ones.
The transformation of writings from scrolls to codices, in basic the hardcover book as we know it today, is an essential event in European history. Quoting accurately by page number, browsing through pages and skipping chapters, all impossible while reading scrolls, become possible.
In the computer age we are witnesses to a kind of revival of the scrolls as we scroll upwards and downwards a document we just see a portion of. Maybe the introduction of hypertext is the beginning of a similar change as the replacement of scrolls by codices.
On behalf of the
The North Atlantic Treaty was signed in Washington on 4 April 1949, creating NATO (= North Atlantic Treaty Organization). It was an alliance of 12 independent nations, originally committed to each other's defense. Between 1952 and 1982 four more members were welcomed and in 1999, the first ex-members of
Visa International's over 21,000 member financial institutions have made VISA one of the world's leading full-service payment network. Visa's products and services include Visa Classic card, Visa Gold card, Visa debit cards, Visa commercial cards and the Visa Global ATM Network. VISA operates in 300 countries and territories and also provides a large consumer payments processing system.
Amazon.Com was one of the first online bookstores. With thousands of books, CDs and videos ordered via the Internet every year, Amazon.Com probably is the most successful Internet bookstore.
The Ku Klux Klan has a long history of violence. It emerged out of the resentment and hatred many white Southerners. Black Americans are not considered human beings. While the menace of the KKK has peaked and waned over the years, it has never vanished.
The RIPE Network Coordination Centre (RIPE NCC) is one of three Regional Internet
Registries (RIR), which exist in the world today, providing allocation and registration services which support the operation of the Internet globally, mainly the allocation of
http://www.ripe.net
An assembly line is an industrial arrangement of machines, equipment, and workers for continuous flow of workpieces in
Looking for ways to create intelligent machines, the field of
Massive online retail bookstore housing more than a million titles. Includes a book recommendation "personalizer,", a comprehensive list of The New York Times bestsellers, a "live" community events calendar with a daily survey and several forums, "highlighted" books from 19 subject areas, browsable categories such as antiques, ethnic studies, and pop culture, Books in the News, and weekly features such as reviews, excerpts, recommendations, interviews, events, "roundups" of popular titles, and quizzes.
American corporation that became the best-known purveyor of child and adult entertainment in the 20th century. Its headquarters are in Burbank, Calif. The company was founded in 1929 and produced animated motion-picture cartoons.
In 1955 the company opened the Disneyland amusement park, one of the world's most famous. Under a new management, in the 1980s, Disney's motion-picture and animated-film production units became among the most successful in the United States. In 1996 the Disney corporation acquired Capital Cities/ABC Inc., which owned the ABC television network. The Disney Company also operates the Disney Channel, a pay television programming service.
b. July 1, 1646, Leipzig
d. November 14, 1716, Hannover, Hanover
German philosopher, mathematician, and political adviser, important both as a metaphysician and as a logician and distinguished also for his independent invention of the differential and integral calculus. 1661, he entered the University of Leipzig as a law student; there he came into contact with the thought of men who had revolutionized science and philosophy--men such as
A CPU is the principal part of any digital computer system, generally composed of the main memory, control unit, and arithmetic-logic unit. It constitutes the physical heart of the entire computer system; to it is linked various peripheral equipment, including input/output devices and auxiliary storage units...
Backbone networks are central networks usually of very high bandwidth, that is, of very high transmitting capacity, connecting regional networks. The first backbone network was the
b. December 3, 1903, Budapest, Hungary
d. February 8, 1957, Washington, D.C., U.S.
Mathematician who made important contributions in quantum physics, logic, meteorology, and computer science. His theory of games had a significant influence upon economics. In computer theory, von Neumann did much of the pioneering work in logical design, in the problem of obtaining reliable answers from a machine with unreliable components, the function of "memory," machine imitation of "randomness," and the problem of constructing automata that can reproduce their own kind.
Being itself under the umbrella of the
A bottom-up
Microsoft Network is the online service from
http://www.msn.com
Being an organization established in the name of the US government, the Federal Networking Council (FNC) acts as a forum for networking collaborations among Federal agencies to meet their research, education, and operational mission goals and to bridge the gap between the advanced networking technologies being developed by research FNC agencies and the ultimate acquisition of mature version of these technologies from the commercial sector.
Its members are representatives of agencies as the National Security Agency, the Department of Energy, the
http://www.fnc.gov
A proxy server is a server that acts as an intermediary between a workstation user and the Internet so that security, administrative control, and caching service can be ensured.
A proxy server receives a request for an Internet service (such as a Web page request) from a user. If it passes filtering requirements, the proxy server, assuming it is also a cache server, looks in its local cache of previously downloaded Web pages. If it finds the page, it returns it to the user without needing to forward the request to the Internet. If the page is not in the cache, the proxy server, acting as a client on behalf of the user, uses one of its own
Source: Whatis.com