Technology Glossary


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  • UNIVERSAL SERVICE
    The financial mechanism which helps compensate telephone companies or other communications entities for providing access to telecommunications services at reasonable...
  • UNIVERSAL SERVICE
    The financial mechanism which helps compensate telephone companies or other communications entities for providing access to telecommunications services at reasonable...
  • Universal Service
    This term describes the financial support mechanisms that constitute a universal fund which helps compensate telephone companies or other communication...
  • Universal Transverse Mercator UTM
    A widely used map projection employing a series of identical projections around the world in the intermediate latitudes, each covering...
  • Upgrade
    to install a higher version or release of software on a computer system, or to add memory or newer types...
  • Uplink
    The signal that carries information from an earth station source up to a satellite.
  • Uplink Downlink
    Programs are "uplinked" to the satellite transponder and "downlinked" to the ground receiving dish.
  • Upload
    To send a text file or software program via telecommunications to another computer (See Download).
  • Uploading
    The transfer of copies of a file from the user's own computer to a remote database or other computer. The...
  • URL
    See Uniform Resource Locator.
  • URL Uniform resource locator
    a World Wide Web address composed of several parts including the protocol, the server where the resource resides, the path...
  • URLs Uniform Resource Locators
    Pronounced "earls". The address system used by the Internet to locate resources such as web sites. An URL includes the type of...
  • US
    USAir
  • USAF
    United States Air Force
  • USDLA
    US Distance Learning Association.
  • Usenet Groups
    Usenet groups are also known as newsgroups, or discussion groups. Users exchange information generally provided in a "chat room."
  • Users
    the people who use technology as a tool to do their jobs. Typically users include instructional staff who provide instruction...
  • USGS
    United States Geological Survey
  • UTC
    Coordinated Universal Time, the world-wide common time standard that is used in EAS headers for time stamp.
  • Utility software
    computer programs that help to manage, recover, and back up files.
  • UTP
    Unshielded Twisted Pair.
  • V
    Velocity
  • V S
    Vertical Speed/Vertical
  • V TRK
    Vertical Track
  • V2
    Takeoff Climb Velocity
  • VA
    Heading to an Altitude
  • VA
    Design Maneuvering Speed
  • Valid Code
    an EAS header which has been matched bit-for-bit with one or two other received headers thereby checked for validity.
  • Value Added Network VAN
    A national (or international) enhanced net-work that is designed expressly to carry data communications. VANs provide special services to their...
  • VAR
    Variation
  • VAR
    Volt-amps Reactive
  • VAR
    Visual-aural Radio Range
  • VASI
    Visual Approach Slope Indicator
  • VBF LO
    Flaps up minimum buffet speed at current maneuver load factor minus altitude dependent variable
  • VBFNG HI
    High speed CAS at N g's to buffet onset
  • VBFNG LO
    Low speed CAS at N g's to buffet onset
  • VC
    Design Cruising Speed
  • VCMAX
    Active Maximum Control Speed
  • VCMIN
    Active Minimum Control Speed
  • VD
    Design Diving Speed
  • VD
    Heading to a DME distance
  • vector
    In image processing, the coordinate in n space (where n is the number of features, bands, or channels), determined by...
  • vector
    A line that, by scaled length, indicates magnitude, and whose arrowhead represents direction of action.
  • Version
    a major edition of a software program. The version number changes when a software developer makes major alterations to the...
  • Vertical Blanking Interval VBI
    The period of time between television pictures, which is visible as a black bar when the picture rolls. The VBI...
  • Vertical Integration
    The involvement of cable systems in other links of the video distribution chain, such as program production and supply.
  • VERY HIGH FREQUENCY VHF
    The part of the radio spectrum from 30 to 300 megahertz, which includes TV Channels 2-13, the FM broadcast band...
  • Very High Frequency VHF
    Radio frequencies in the band from 30 to 300 MHz.
  • VERY HIGH FREQUENCY VHF
    The part of the radio spectrum from 30 to 300 megahertz, which includes TV Channels 2-13, the FM broadcast band...
  • Very High Frequency VHF
    The part of the radio spectrum from 30 to 300 megahertz which includes TV channels 2-13, the FM broadcast band,...
  • VF
    Design Flap Speed
  • VFE
    Flaps Extended Placard Speed
  • VFR
    Visual Flight Rules
  • VFXR R
    Flap Retraction Speed
  • VFXR X
    Flap Extension Speed
  • VG
    Ground Velocity
  • VGND
    Ground Velocity
  • VH
    Maximum Level-flight Speed with Continuous Power
  • VHF
    Very-high Frequency
  • VHRR
    Very High-Resolution Radiometer
  • VI
    Vegetation Index. A vegetation index is a quantitative measure used to measure biomass or vegetative vigor, usually formed from combinations...
  • vicarious calibration
    In-orbit radiometric calibration of a satellite sensor by a method independent of that used to perform the initial laboratory calibration....
  • Video Bridge
    Specialized equipment that permits three locations or more to be joined together in a videoconference.
  • VIDEO DESCRIPTION
    An audio narration for television viewers who are blind or visually disabled, which consists of verbal descriptions of key visual...
  • VIDEO DESCRIPTION
    An audio narration for television viewers who are blind or visually disabled, which consists of verbal descriptions of key visual...
  • Videoconference
    A meeting, instructional session, or conversation between people at different locations relying on video technology as the primary communication link....
  • Videodisc
    A phonograph record-type disc that displays recorded video information when played on an attachment to a television set.
  • Videotext
    An interactive service connecting a TV set and text or video recorder to a central computer by phone lines or...
  • vidicon
    A storage-type, electronically scanned, photoconductive, television camera tube, which, often has a response to radiation beyond the limits of the...
  • Virtual Reality
    A computer simulation usually experienced through headgear, goggles and sensory gloves that allows the user to experience being present in...
  • visible radiation
    Electromagnetic radiation of the wavelength interval to which the human eye is sensitive; the spectral interval from approximately 0.4 to...
  • VISSR
    Visible Infrared Spin Scan Radiometer
  • Vl
    Heading to a course intercept
  • Vl
    Critical Engine Failure Velocity (Takeoff Decision Speed)
  • VLE
    Landing Gear Extended Placard Airspeed
  • VLO
    Maximum Landing Gear of Operating Speed
  • VLOF
    Lift-off Speed
  • Vls
    Lowest Selectable Airspeed
  • VM
    Heading to a manual termination
  • VM LO
    Minimum Maneuver Speed
  • VMAX
    Basic Clean Aircraft Maximum CAS
  • VMC
    Visual Meteorological Conditions
  • VMC
    Minimum Control Speed with Critical Engine Out
  • VMIN
    Basic Clean Aircraft Minimum CAS
  • VMO
    Velocity Max Operating
  • VNAV
    Vertical Navigation (provides computer description of aircraft's speed and altitude that can be tracked by autoflight system)
  • VNE
    Never-exceed Speed
  • VNIR
    Visible & Near Infrared
  • VNO
    Maximum Structural Cruising Speed
  • VO
    Voice Over
  • Voice Carry Over VCO
    A reduced form of TRS where the person with the hearing disability speaks directly to the other end user. The...
  • volt
    A unit of measure of electrical force. It is a function of the flow current (ampere) and the amount of...
  • Voluntary Participation
    As redefined in the 1990 regional FCC workshops on the EBS. Voluntary participation in local EAS activations means that broadcasters...
  • VOM
    Volt-ohm-milliammeter
  • VOR
    VHF OmniRange Navigatgion System (ground navigational aid that can provide display of aircraft position relative to course through selected ground...
  • VORTAC
    VHF Omni Range Radio/Tactical Air Navagation
  • VPATH
    Vertical Path
  • VR
    Heading to a radial
  • VR
    Takeoff Rotation Velocity
  • VREF
    Reference Velocity

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