Data Dictionary - J - K

J

K

  • Jitter
  • Job
  • Job Processing
  • Jumper
  • Jump Instruction
  • kernal
  • Keyword-in-context
  • Kill
  • Kilobyte (KB)
  • Kludge
  • Knockout

Jitter
On television and computer monitors, small vibrations or fluctuations in a displayed image caused by irregularities in the display signal. Jitter is often visible in horizontal lines that are the same thickness as scan lines. In facsimile transmission, a “rough” appearance produced by dots that are incorrectly recorded during the scanning process and thus wrongly positioned on the output.

Job
A specified amount of processing performed as a unit by a computer. The term dates from the introduction of mainframe computers, when data was submitted in batches, often on punched cards, for processing by different programs; work was therefore scheduled and carried out in separate operations, or jobs.

Job Processing
A computing method in which a series of job, each consisting of one or more tasks grouped together as a computationally coherent whole, is processed sequentially.

Jumper
A conductor that use to connect (short) adjacent pins on a PCB (printed circuit board) to vary the configuration.

Jump Instruction
An instruction that transfers the flow of execution from one statement or instruction to another.

K

Kernel
The core of an operating system; the portion of the system that manages memory, files, and peripheral devices; maintains the time and date; launches applications; and allocates system resources.

Keyword-In-Context
Abbreviated KWIC. An automatic search methodology used to create indexes of document text or titles in which each keyword is stored along with some surrounding text, usually the word or phrase (stripped of non-essential text such as articles and connectives) that precedes and follows the keyword in the text or title.

Kill
To stop, frequently to abort. In multiprocessing, a command that suspends a process and returns control to its parent is said to kill the child process. In file management, kill means to erase a copy of a file, often without hope of reversing the action.

Kilobyte (KB)
See Byte

Kludge
Pronounced “klooj.” With computers, a term used to describe a piece of hardware or software that basically operates properly but whose construction or design is severely lacking in elegance or logical efficiency. With hardware, a kludge is generally a short-term or makeshift solution to a problem, often characterized by the use of various types of adhesive tape, inventive electrical connections, and unstylish housing. With software, a kludge is a program that suffers from a lack of design or forethought; usually, a kludged piece of software is one written in a hurry to satisfy an immediate need. Such software is extremely difficult for anyone other than its creator to maintain, and it has a tendency to blossom into spaghetti code.

Knockout
In multicolor printing, the process of removing from one image to the overlapping parts of a graphics or text that are to be printed in a different colour so that ink colours will not mix, For example, if the text were printed in yellow ink over a background that was printed in blue, the yellow text would show a green tint; to avoid this, the text is knocked out of the blue image.

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