In radiocommunications, an environment that is under the influence of extrinsic factors that degrade communications integrity, such as when (a) the benign communications medium is disturbed by natural or man-made events (such as an intentional nuclear burst), (b) the received signal is degraded by natural or man-made interference (such as jamming signals or co-channel interference), (c) an interfering signal can… (Read More →)

A sequence of data elements, such as bits or characters, considered as a whole.

A straight line or arc that is used as a segment of a graphic character.

In character recognition, the line of discontinuity between a side of a stroke and the background, obtained by averaging, over the length of the stroke, the irregularities resulting from the printing and detecting processes.

In facsimile systems, the rate at which a fixed line perpendicular to the direction of scanning is crossed in one direction by a scanning or recording spot.
Note 1: Stroke speed is usually expressed as a number of strokes per minute. When the system scans in both directions, the stroke speed is twice this number.
Note 2: In most conventional… (Read More →)

In character recognition, the distance between the two edges of a stroke, measured perpendicular to the stroke centerline.

Authentication by means of cryptographically derived credentials. [After X.509]

Development of a system or part of a system where components at lower levels are traceable from those at the higher level [CESG]. See also: Disciplined, Rigorous, Verified Development

A technique for organizing and coding computer programs in which a hierarchy of modules is used, each having a single entry and a single exit point, and in which control is passed downward through the structure without unconditional branches to higher levels of the structure. Three types of control flow are used: sequential, test, and iteration.

Text for which a well-defined, unambiguous internal structure is defined. Such text shall be human readable and interpreted identically by all conforming implementations [POSIX.6].