content addressable memory

<hardware, storage>

(CAM, or "associative memory") A kind of storage device which includes comparison logic with each bit of storage. A data value is broadcast to all words of storage and compared with the values there. Words which match are flagged in some way. Subsequent operations can then work on flagged words, e.g. read them out one at a time or write to certain bit positions in all of them. A CAM can thus operate as a data parallel (SIMD) processor.

CAMs are often used in caches and memory management units.

Last updated: 1995-02-16

content-based information retrieval

<image, algorithm>

(CBIR, query by image content, QBIC, content-based visual information retrieval, CBVIR) A general term for methods using image analysis to try to identify objects and features in images to allow them to indexed and searched.

This contrasts with the use of image metadata such as keywords or tags associated with (and possibly stored in) the image.

[IEEE Computer, September 1995].

Last updated: 2017-12-12

content-based visual information retrieval

content-based information retrieval

Content Data Model

<standard, documentation, language>

(CDM) An SGML-based specification for interactive maintenance manuals, developed by the Air Force Human Resourceas Laboratory (AFHRL) with assistance from RJO Enterprises, Incorporated. CDM models data hierachically and data are identified by their content structure with SGML mark-up used to identify information classes such as "system information", "functions", "tasks" and "steps".

["Final Report - Content Data Model of Organizational Maintenance Information for Automated Interchange of Technical Source Data.", Chicago, Illinois, Datalogics, Inc., 1998-07-07].

Last updated: 2014-10-20



1. (By analogy with "context-free") Used of a message that adds nothing to the recipient's knowledge. Though this adjective is sometimes applied to flamage, it more usually connotes derision for communication styles that exalt form over substance or are centred on concerns irrelevant to the subject ostensibly at hand. Perhaps most used with reference to speeches by company presidents and other professional manipulators.

See also four-colour glossies.


2. Within British schools the term refers to general-purpose software such as a word processor, a spreadsheet or a program that tests spelling of words supplied by the teacher. This is in contrast to software designed to teach a particular topic, e.g. a plant growth simulation, an interactive periodic table or a program that tests spelling of a predetermined list of words. Content-free software can be more cost-effective as it can be reused for many lessons throughout the syllabus.

[Jargon File]

Last updated: 2014-10-30

contention slot


In a communication system where only one node at a time may transmit successfully on a shared channel, the contention slot or contention period is the time a node must wait before it can be sure that no other node's transmission has collided with its transmission.

If node A starts to transmit at time t0 and then another node starts to transmit just before it recieves A's transmission at time t0 + T, then the transmissions will collide but node A will not detect the collision until time t0 + 2T. The contention slot, 2T, for nodes seperated by the maximum propagation delay thus determines how much data the node must be prepared to re-transmit in the event of a collision.

Last updated: 2014-11-06

Contents of Address part of Register


(car) /kar/ The left-hand element of a Lisp cons cell.

Last updated: 2014-11-09

Contents of Decrement part of Register


(cdr) /ku'dr/ or /kuh'dr/ The right-hand element of a Lisp cons cell.

Last updated: 2014-11-09

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