Technology terms starting with D

1,369 terms

"Digital Chart of the World" (DCW) The first 1:1,000,000-scale digital basemap of the world. The DCW contains topologically based vector data digitized from the U.S.
D Dust
D channel In ISDN, the 16-kb/s segment of a 144-kb/s, full-duplex subscriber service channel that is subdivided into 2B+D channels, i.e.
D layer See D region, ionosphere.
D Region In solar-terrestrial terms, a daytime layer of the earth's ionosphere approximately 50 to 90 km in altitude.
D Spec Process specification.
D Star Measure of infrared sensor sensitivity.
D&D Design and Development
D&T Detection and Tracking.
D-4 A framing standard for traditional time-division multiplexing, which standard describes user channels multiplexed onto a trunk that has been segmented…
D-A Digital-to-Analog
D-IFOG Depolarized- Interferometric Fiber Optic Gyro.
D-Level Depot Level (ILS term).
D-Prime (D') A statistical measure of how well a system can discriminate between a signal and a non-signal.
D-Star(D*) Synonym specific detectivity.
D-type patch bay A patch bay designed for patching and monitoring of unbalanced data circuits at rates up to 1 Mb/s.
D/V Demonstration and Validation.
D1 See channel bank.
D2 Projective (interceptor) in the Hyper-Velocity Gun program.
D3 See channel bank.
D4 See channel bank.
DA (1) Department of the Army. (2) Department of Administration. (3) Decision Analysis. (4) Developing Agency/Activity. (5) Data Administrator.
DAA Designated Approval Authority (DD 5000 term).
DAASAT Direct Ascent Anti-Satellite.
DAB (Full term: single domain antibody ). Antibodies with only one (instead of two) protein chain derived from only one of the two domains of the normal…
DAC (1) Days After Contract [Award]. (2) Department of the Army Civilian. (3) Directed Attack Characterization. (4) Deploy ACCS Component.
DACL (discretionary access control list) The part of an object's security descriptor that grants or denies specific users and groups permission to access the object.
DACS Divert and Attitude Control System.
DAD Defense Acquisition Deskbook .
DADS Distributed Air Defense Study (1993).
DAE Defense Acquisition Executive.
daemon Abbreviation for disk and execution monitor. A procedure that is invoked without being called explicitly whenever an alteration, an addition, or a…
daemon thread Daemon threads are non-user threads. They are typically used to carry out low-priority tasks that should not take priority over the main task of the…
DAES Defense Acquisition Executive Summary.
DAFS Direct Access File System. A file system based on virtual interface (VI) architecture, designed for narrow-sharing environments, that is, environments…
DAFS (Direct Access File System) "Direct Access File System" is a network file system similar toNFS and CIFS that allows applications to transfer data whilebypassing operating system…
DAG (Directed Acyclic Graph) A directed graph containing no directed cycles, i.e. closed directed loops. See also: Mathworld's definition.
DAGGR Depressed Altitude Guided Gun Round.
DAHQ Department of the Army Headquarters.
DAI Damage Assessment Indicator (targets).
Daisy Chain A cable configuration in which internal and external SCSI devices such as hard drives, CDs, scanners, and tape drives are connected in a series to the…
DAL Defended Asset List. 72
DAMA Demand Assigned Multiple Access.
DAML+OIL A successor language to DAML and OIL that combines features of both; it is now âoutdatedâ because it was superseded by Web Ontology Language…
Damping Resistance which reduces vibration by energy absorption.
Damping ratio The ratio of the actual damping to the critical damping, critical damping being the minimum amount of damping which prevents free oscillatory vibration.
DANASAT Direct Ascent Nuclear Anti-Satellite.
dangle length Minimum length allowed for dangling arcs during the CLEAN process. CLEAN removes dangling arcs that are shorter than the dangle length.
dangling arc An arc having the same polygon on both its left and right sides and having at least one node that does not connect to any other arc.
dangling node The endpoint of a dangling arcnot connected to another arc.
dangling statement A bare, single "statement", without any braces, hanging off an if or while conditional. C allows them. Perl doesn't.
dangling threat Set of properties about the external environment for which there is no corresponding vulnerability and therefore no implied risk. [INFOSEC-99]
dangling vulnerability [A] set of properties about the internal environment for which there is no corresponding threat and, therefore, no implied risk. [INFOSEC-99]
DAPR Directors Annual Program Review (SDIO term)
DAR Direct Access Restore. A process by which select data is restored from an NDMP tape backup device to the filer.
dark current The external current that, under specified biasing conditions, flows in a photoconductive detector when there is no incident radiation.
DARO Defense Aeronautical Reconnaissance Office (OSD).
DARP Defense Aeronautical Reconnaissance Program.
DARPA Defense Advanced Research Projects Agency. See ARPA.
DART OBSOLETE. Defense Acquisition Review Team.
DAS (Direct Attached Storage) "Direct Attached Storage" a digital storage system directlyattached to a server or workstation without a storage network inbetween.
DASA German Aerospace. Member of the MEADS Program Team.
DASC Deep Air Support Center (JFACC term).
DASD OBSOLETE. Deputy Assistant Secretary of Defense.
DASD (C3) Deputy /Assistant Secretary of Defense (C3).
DASD (Direct-Access Storage Device) generic nomenclature for a storage peripheral that can respond directly to random requests for information; usually denotes a disk drive.
dashboard See definition for: digital dashboard
dashboard site A Web site created by using Digital Dashboard technology. The dashboard site contains a number of pages, or dashboards, and includes customization pages…
DASL See definition for: Distributed Authoring Search and Location (DASL)
DASO Demonstration and Shakedown Operation.
DAT An acronym for Digital Audio Tape, which some backup systems utilize as a storage medium.
data A representation of facts, concepts, or instructions in a formalized manner suitable for communication, interpretation, or processing by humans or by…
data access arrangement In public switched telephone networks, a single item or group of items at the customer side of the network interface for data transmission purposes…
Data Access Language (DAL) Apple's former standard to allow applications to communicate with relational databases. DAL is middleware on a network.
data access security Measures taken to control system users' ability to view or modify data. These measures can include logical views of data and explicit access rights by…
data administration Developing and administering policies, procedures, practices, and plans for defining, organizing, protecting and efficiently utilizing data.
data aggregation [In security,] the compilation of unclassified individual data systems and data elements resulting in the totality of the information being classified.
data archiving a process of transferring information from on-line storage devices such as fixed magnetic disk drives to off-line storage media such as magnetic tape or…
data attribute A characteristic of a data element such as length, value, or method of representation.
data authentication A process used to verify data integrity, e.g., verification that data received are identical to data sent, or verification that a program is not infected…
data bank A set of data related to a given subject and organized in such a way that it can be consulted by users. 2.
data base The information and/or data physically stored in a record center or electronically stored in machine form; implies a system that permits access to and…
Data Base Management System (DBMS) Software that manages, manipulates and retrieves data in a database.
data base node (DBN) A signaling point that acts as a repository of information and provides query/response services for processing and routing of certain types of network…
data burst Synonym burst transmission.
data bus A bus used to transfer data within or to and from a processing unit or storage device.
data center A facility that provides a suitable environment (power, cooling, network connectivity, management services) for housing information technology equipment…
data channel Communication link(s) over which the actual data of interest flows. High Bandwidth; authenticated by default; encryption and integrity protection optional.
data circuit connection The interconnection of any combination of links and trunks, on a tandem basis, by means of switching equipment to facilitate information interchange.
data circuit-terminating equipment See DCE.
data collection facility A facility for gathering and organizing data from a group of sources.
data collection processor A communications device, serving as mediation equipment in the telecommunication management network, that provides concentration, protocol conversion, and…
data collector An object that defines what data will be collected from a provider (such as a counter provider or event provider).
data collector set A group of data collectors stored as a single object.
data communication The transfer of information between functional units by means of data transmission according to a protocol.
data communication control procedure A means used to control the orderly communication of information among stations in a data communication network.
data communication network (DCN) A configuration of telecommunication facilities for the purpose of transmitting data, as opposed to analog signals. [After T1.210-1989]
data communications control character See control character.
data communications equipment Deprecated term. See DCE.
data compaction The reduction of the number of data elements, bandwidth, cost, and time for the generation, transmission, and storage of data without loss of information…