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A tachyonic antitelephone is a hypothetical device in theoretical physics that could be used to send signals into one's own past. Albert Einstein in 1907 [1] [2] presented a thought experiment of how faster-than-light signals can lead to a paradox of causality, which was described by Einstein and Arnold Sommerfeld in 1910 as a means "to telegraph into the past". [3]
Many models of communication include the idea that a sender encodes a message and uses a channel to transmit it to a receiver. Noise may distort the message along the way. The receiver then decodes the message and gives some form of feedback. [1] Models of communication simplify or represent the process of communication.
The communication channel is the infrastructure that enables messages to "travel" between the communicating parties. The message exchange patterns describe the message flow between parties in the communication process, there are two major message exchange patterns — a request–response pattern, and a one-way pattern.
Node D is unaware of the ongoing data transfer between node A and node B. Node D has data to send to node C, which is in the transmission range of node B. D initiates the process by sending an RTS frame to node C. Node C has already deferred its transmission until the completion of the current data transfer between node A and node B (to avoid co-channel interference at node B).
Examples of a US-made set, the CDS-501, were captured in Cuba and are thought to have seen use in Central and Eastern Europe.The device operated in the upper part of the VHF band and sent high speed bursts of encrypted data from an agent to a receiving station located within a Western diplomatic facility in a hostile country to avoid interception by the adversary signals intelligence service.
Predating by four years her phenomenally bestselling book about gender differences in ways of speaking, You Just Don't Understand, this book approaches communication and miscommunication from a linguistic point of view rather than a psychological one, emphasizing differences between the genders. The book lays out the linguistic devices and ...
Countersurveillance refers to measures that are usually undertaken by the public to prevent surveillance, [1] including covert surveillance.Countersurveillance may include electronic methods such as technical surveillance counter-measures, which is the process of detecting surveillance devices.
Ursula K. Le Guin first used the word ansible in her 1966 novel Rocannon's World. [1] [4] Etymologically, the word was a contraction of answerable, as the device allowed its users to receive answers to their messages in a reasonable amount of time, even over interstellar distances.