Technology terms starting with R

1,106 terms

  1. Red/Blue Exchange A process to identify and define potential countermeasures that would degrade aspects of ballistic missile defense.
  2. redaction A portion of an image or document is intentionally concealed to prevent disclosure of specific portions.
  3. REDCAP Real-time Electromagnetic Digitally Controlled Analyzer and Processor (USAF term).
  4. Redirect A method of alerting browsers and search engines that a page location moved. 301 redirects are for permanent change of location and 302 redirects are used…
  5. redirecting number (RN) A set of digits and related indicators (type of number, numbering plan identification, screening indicator, presentation indicator) that provide numbering…
  6. Redirection A system profile construction method of starting at a base platform and adding new services by allowing a service component to ask the base platform to…
  7. Redout The degradation of infrared sensor resolution due to high-altitude nuclear bursts.
  8. Redshift A change in the frequency or wavelength of light. This can arise from motion of the source (Doppler shift), expansion of space, or strong gravitational…
  9. reduced carrier single-sideband emission A single-sideband emission in which the degree of carrier suppression enables the carrier to be reconstituted and to be used for demodulation. [NTIA] [RR]
  10. reduced carrier transmission A form of amplitude-modulation in which the carrier is transmitted at a controlled level below that which is required for demodulation, but at a level…
  11. reducer An executable in the MapReduce process that uses the intermediate results from the mapper and processes them into the final output.
  12. reduction ratio relationship between the dimensions of the original or master and the corresponding dimensions of the microfilmed or photocopied image
  13. Redundancy The inclusion of duplicate or alternate system elements to improve operational reliability by ensuring continued operation in the event that a primary…
  14. redundancy check A method of verifying that any redundant hardware or software in a communication system is in an operational condition. 2.
  15. redundant array of independent disks (RAID) NetApp appliances use RAID 4, which protects against disk failure by computing parity information based on the contents of all the disks in the array.
  16. redundant code A code using more signal elements than necessary to represent the intrinsic information. Note: The redundancy may be used for error-control purposes.
  17. redundant value The value of a data type that has no use or meaning within a particular context.
  18. Reengineering The process of examining, altering, and re-implementing an existing computer system to reconstitute it in a new form.
  19. reentrant entity bean An entity bean that can handle multiple simultaneous, interleaved, or nested invocations that will not interfere with each other.
  20. Reentry The return of objects originally launched from earth, into the atmosphere.
  21. Reentry Angle Elevation angle of velocity vector relative to local horizontal plane when reentering object reaches 92km.
  22. Reentry Phase That portion of the trajectory of a ballistic missile or space vehicle where there is a significant interaction of the vehicle and the earths atmosphere.
  23. Reentry Vehicle (RV) (1) Reentry vehicles are objects containing nuclear warheads. They are released from the last stage of a booster rocket or from a post-boost vehicle early…
  24. refer equities For material which NARA does not have the authority to declassify, the process of consulting with, and requesting declassification authority and…
  25. reference A document that discloses subject matter that is material to a determination of the patentability of a claimed invention. MPEP 2126, MPEP 2126.
  26. reference analysis A statistical breakdown of requests for records during a specific period to determine usage of individual types of records
  27. reference antenna An antenna that may be real, virtual, or theoretical, and has a radiation pattern that can be used as a basis of comparison with other antenna radiation…
  28. reference black level [In television,] The level corresponding to the specified maximum excursion of the luminance signal in the black direction. [47CFR]
  29. reference circuit A hypothetical circuit of specified equivalent length and configuration, and having a defined transmission characteristic or characteristics, used…
  30. reference clock A clock with which another clock is compared. 2. A clock, usually of high stability and accuracy, used to govern a network of mutually synchronized clocks…
  31. reference color space The geometric representation of colors in three-dimensional space. [CIE 845-03-25] Note: There are three reference spaces recognized by ISO 8613: CMYK…
  32. reference configuration In ISDN, a combination and arrangement of functional groups and reference points that reflect possible network topology.
  33. reference data transfer an information transfer between two server application processes acting cooperatively on instructions from a third application process.
  34. reference file A file containing non-record copies of documents that is maintained for information purposes See also convenience file and working file.
  35. reference frequency A standard fixed frequency from which operational frequencies may be derived or with which they may be compared.
  36. reference materials Items needed in-house to complete work, usually considered as non-records and not included in a records inventory or on a records retention schedule
  37. reference model A set of conventions and concepts, mutually agreed upon between the information system user and provider communities [POSIX.0].
  38. Reference Monitor The security engineering term for IT functionality that 1) controls all access, 2) cannot be by-passed, 3) is tamper-resistant, and 4) provides confidence…
  39. reference monitor concept 1. An access control concept that refers to monitoring of all accesses to objects by subjects [CESG]. 2.
  40. reference monitoring An access control concept utilizing an abstract machine to mediate all access to objects by subjects.
  41. reference noise The magnitude of circuit noise chosen as a reference for measurement. Note: Many different levels with a number of different weightings are in current…
  42. reference point In ISDN, a logical point between two, nonoverlapping functional groups. Note: When equipment is placed at a reference point, that reference point is…
  43. reference surface In optical-fiber technology, that surface of an optical fiber that is used to contact the transverse-alignment elements of a component such as a connector…
  44. reference system A group of related reference circuits.
  45. reference transmission level point See relative transmission level, transmission level point.
  46. reference validation mechanism [The] Portion of a trusted computing base whose normal function is to control access between subjects and objects and whose correct operation is essential…
  47. reference waveform The artificially generated time history of an earthquake, derived from the histories of many actual earthquake accelerometers.
  48. reference white level [In television,] The level corresponding to the specified maximum excursion of the luminance signal in the white direction. [47CFR]
  49. referent Whatever a reference refers to, which may or may not have a name. Common types of referents include scalars, arrays, hashes, and subroutines.
  50. referential integrity The capability to ensure that changes to one table that affect other tables are transmitted to those other tables.
  51. Referral Fees Fees paid in exchange for delivering a qualified sales lead or purchase inquiry.
  52. Referrer The URL of the web page from which a visitor came. The server's referrer log file will indicate this.
  53. refile process of returning a record to its proper place
  54. Reflectance The amount (percent) of light that is reflected by a surface relative to the amount that strikes it.
  55. reflected code Synonym Gray code.
  56. reflecting layer In the ionosphere, a layer that has a free-electron density sufficient to reflect radio waves.
  57. reflecting loss See reflection loss.
  58. reflection The process whereby radiation (or other waves) incident upon a surface is directed back into the medium through which it traveled.
  59. reflection coefficient (RC) The ratio of the amplitude of the reflected wave and the amplitude of the incident wave. 2.
  60. reflection loss At a discontinuity or impedance mismatch, e.g., in a transmission line, the ratio of the incident power to the reflected power.
  61. reflective array antenna An antenna, such as a billboard antenna, in which the driven elements are situated at a predetermined distance from a surface designed to reflect the…
  62. Reflectivity The measure of the efficiency of a radar target in intercepting and returning Electro Magnetic Energy.
  63. Reflector A component of a solar energy facility that reflects incident sunlight to a desired location or component within the facility, allowing it to be converted…
  64. refracted ray A ray that undergoes a change of velocity, or in the general case, both velocity and direction, as a result of interaction with the material medium in…
  65. Refraction The change in direction of a ray of light when it passes through one media to another with differing optical densities.
  66. refraction profile Synonym refractive index profile.
  67. refractive index (η, n) Of a medium, the ratio of the velocity of propagation of an electromagnetic wave in vacuum to its velocity in the medium. Synonym index of refraction.
  68. refractive index contrast In an optical fiber, a measure of the relative difference in refractive index of the core and cladding.
  69. refractive index profile Of the cross section of an optical fiber, the description, i.e., plot, of the value of the refractive index as a function of distance from the fiber axis…
  70. reframing time The time interval between the instant at which a valid frame-alignment signal is available at the receiving data terminal equipment and the instant at…
  71. refresh To reproduce, repeatedly, a display image on a display surface, so that the image remains visible.
  72. refresh packets Signaling packets that are transmitted on a periodic basis across a permanent virtual circuit in the direction of transmission from the channelized side…
  73. Refresh Tag See the paragraph about HTTP_EQUIV under Meta Tag.
  74. Refreshing This term can refer to periodic retensioning of tape, or the rerecording of recorded information onto the same tape (or different tape) to refresh the…
  75. regeneration In biology, regrowth of damaged or destroyed tissue or body part.
  76. regenerative feedback Feedback in which the portion of the output signal that is returned to the input has a component that is in phase with the input signal.
  77. regenerative repeater A repeater, designed for digital transmission, in which digital signals are amplified, reshaped, retimed, and retransmitted. Synonym regenerator.
  78. regenerator Synonym regenerative repeater. 2. A device that reconstructs and retransmits a received pulse train. [T1.403-1989]
  79. regex See "regular expression".
  80. region A coverage feature class used to represent a spatial feature as one or more polygons. Many regions can be defined in a single coverage.
  81. Regional Bell Operating Company (RBOC) Historically, one of the seven holding companies formed by divestiture by the American Telephone and Telegraph Company of its local Bell System operating…
  82. regional center See office classification.
  83. Regional Defense System (RDS) That portion of the SDS that provides defense for a specific geographic region, such as the European Theater.
  84. regional disaster A disaster, such as an earthquake or hurricane, that affects a large region. Local, campus, and proximate metropolitan clusters are less likely to protect…
  85. Regional Operations Center (ROC) A group of fixed and/or mobile centers with OPCON over allocated ground based sensors and weapons. 246
  86. Regional Operations Control Center (ROCC) The command function for CONUS, Canadian and Alaska NORAD Regions, referred to as regions.
  87. Regions - US East, US West, GovCloud Amazon’s way of classifying multiple geographic areas hosting EC2 world-wide. Each AWS Region is a separate geographic area.
  88. register a record book; it is also the county official charged with keeping record copies of legal instruments such as property deeds and other records.
  89. registered jack (RJ) Any of the series of jacks, described in the Code of Federal Regulations, Title 47, part 68, used to provide interface to the public telephone network.
  90. registered table A DBMS table which is part of an ArcStorm database is said to be 'registered' with the database.
  91. Registrar A company which allows you to register domain names.
  92. Registration Lining up a forms image to determine which fields are where. Also, entering pages into a scanner such that they are correctly read.
  93. registration agent (RA) An application process that receives an RRP (registration request protocol), message from the registration manager signaling it to start automatic…
  94. registration authority In networking, an organization that performs registration for information objects and devices. [After 2382-pt.35]
  95. Registration Authority (RA) A trusted entity that establishes and vouches for the identity of a subscriber to a CSP.
  96. registration manager (RM) An application process responsible for contacting the registration agent using the RRP (registration request protocol) to start automatic registration of…
  97. registration of a template Official approval of a template by NARA, and placement of the template in the ERA template repository. Once registered, the template can be used.
  98. registration procedure In networking, the procedure for performing registration or for amending or deleting existing registrations. [2382-pt.35]
  99. registration program See FCC Registration Program.
  100. registry An infrastructure that enables the building, deployment, and discovery of Web services.