1. Any threat of a deliberate unauthorized change to the state of a data processing system.
Note: For example, an active threat that would result in modification of messages, insertion of spurious messages, masquerade, or denial of service [2382-pt.8].
2. The threat of a deliberate unauthorized change to the state of the system.
Note: Examples of security-relevant active threats may… (Read More →)

The process of comparing each output video frame with its preceding frame(s) in sequence and quantifying the extent of correspondence between each pair; when there is limited correspondence between a pair of frames (such that the differences measured are distinguishable from the measurement noise), and the corresponding input sequence of frames possesses distinguishable differences, then the current frame is categorized… (Read More →)

For a communications channel during a specified time interval, such as the busy hour, the percentage of time that a signal is present in the channel in either direction.

Automatic calling unit

Administrative Domain

Synonym click-through.

In communications system traffic flow control, channel allocation in which information-handling capacities of channels are not predetermined but are assigned on demand.
Note: Adaptive channel allocation is usually accomplished by means of a multiplexing scheme.

Any communications system, or portion thereof, that automatically uses feedback information obtained from the system itself or from the signals carried by the system to modify dynamically one or more of the system operational parameters to improve system performance or to resist degradation.
Note: The modification of a system parameter may be discrete, as in hard-switched diversity reception, or may… (Read More →)

In computer science, a software-oriented compression process based on continuous analysis of the data stream, and depending on the type and content of the data and the storage medium, corresponding compensation of the compression algorithm.

Differential pulse-code modulation in which the prediction algorithm is adjusted in accordance with specific characteristics of the input signal.