1) " Robotics" -- As it applies to Robotics Modems For other uses, see Robot(disambiguation). In practical usage, a robot is a mechanical device which performs automated tasks, either according to direct humansupervision, a pre-defined program or, a set of general guidelines, using artificial intelligence techniques. These tasks either replace or enhance human work, such as inmanufacturing, construction or manipulation of heavy or hazardous materials. Contents 1 Overview 2 History 3 Literary history 4 Contemporary uses of robots 5 Current developments 6 Future prospects 7 Competitions 8 Possible dangers 9 Classes of Robots 10 Research areas associated withrobotics 11 Additional robot topics 12 Famous roboticists 13 External links 13.1 Media coverage and articles 13.2 General information and non-profit organizations 13.3 Commercial projects Overview A robot may include a feedback-driven connection between sense and action, not under direct human control. The actionmay take the form of electro-magnetic motors or actuators (also called effectors)that move an arm, open and close grips, or propel the robot. The step by step control and feedback is provided by a computer program run on either an external or embedded computer or a microcontroller. By this definition, a robot may include nearly all automateddevices. Two basic ways of using effectors are to move the robot around (locomotion) or to move other object around (manipulation) Thesedivide robotics into two mostly separate categories: mobile robotics (moving) and manipulator robotics (grabbing). Joints connect parts of manipulators. The most common joint types are: - rotary (rotation around a fixed axis)
- prismatic (linear movement)
A parallel robot is one whose arms (primary axes) have three concurrent prismatic joints or both prismatic and rotary joints.Degrees Of Freedom (DOF) means axes of mo...
2) " Modems" -- As it applies to Robotics Modems There was previously an image in this space. It was removed due to a lack of a free license. The imageis pending deletion, and this notice will be removed once the image is deleted. You can still view the image, which was called Modem_dsl.jpg. The caption displayed for this imagewas "Photo of a modem used for DSL.". A modem (a portmanteau word constructed frommodulator and demodulator) is a device that modulates an analog carrier signal ( sound ), toencode digital information, and that also demodulates such a carrier signal to decodethe transmitted information. The goal is to produce a signal that can be transmitted easily and decoded to reproduce the originaldigital data. Primarily used to communicate via telephone lines, modems can be used over any means of transmitting analog signals, from driven diodes to radio. Contents 1 History 1.1 Echo cancellation 2 Description 2.1 Narrowband 2.2 Wireless "modems" 2.3 Broadband 3 Internet access 4 See also History Modems were first introduced as a part of the SAGE air-defense system in the 1950s, connecting terminals located at various airbases, radar sites and command-and-controlcenters to the SAGE director centers scattered around the US and Canada. SAGE ran on dedicated communications lines, but thedevices at either end were otherwise similar in concept to today's modems. IBM was theprimary contractor for both the computers and the modems used in the SAGE system. A few years later a chance meeting between theCEO of American Airlines and a regional manager of IBM led to a"mini-SAGE" being developed as an automated airline ticketing system. In this case the terminals were located at tickettingoffices, tied to a central computer that managed availability and scheduling. The system, known as Sabre, is the distant parent of today's SABRE system.By the early 1960s commerci...
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