GUI (Graphical User Interface)A set of screen presentations and metaphors that utilize graphic elements such as icons in an attempt to make an operating system easier to use.
GUIDA 16-byte value generated from the unique identifier on a device, the current date and time, and a sequence number.
GUID (globally unique identifier)A 16-byte value generated from the unique identifier on a device, the current date and time, and a sequence number.
Guidance(1) Direction, altitude control, and navigation (where appropriate) of sensors or interceptor vehicles.
Guidance Enhanced Missile (GEM)A companion program to PATRIOT PAC-2, which includes enhancements to the radar to increase intercept range and performance.
Guidance System (Missile)A system, which evaluates flight information, correlates it with target data, determines the desired flight path of the missile, and communicates the…
guideA divider or finding aid with a projecting tab used in files to identify a section and to facilitate reference See also file guide and finding aid.
Guided MissileAn unmanned vehicle moving above the surface of the earth, whose trajectory or flight path is capable of being altered by an external or internal…
guided rayIn an optical fiber, a ray that is confined primarily to the core. Note: A guided ray satisfies the relation given by #f21 where θr is the angle the ray…
guided waveA wave having (a) energy concentrated near a boundary, or between substantially parallel boundaries, separating materials of different properties and (b)…
GVAn internal "glob value" typedef, holding a "typeglob". The "GV" type is a subclass of "SV".
GVSCGeneric VHSIC (Very High Speed Integrated Circuit) Spaceborne Computer.
GWAPSGulf War Air Power Survey, 1994 [a DoD -sponsored survey].
H-bendA smooth change in the direction of the axis of a waveguide, throughout which the axis remains in a plane parallel to the direction of magnetic H-field…
H-channelIn Integrated Services Digital Networks (ISDN), a 384-kb/s, 1472-kb/s, or 1536-kb/s channel, designated as "H0", "H10", and "H11", respectively…
hack1. To break into or use a computer network or use a system without authorization, as a hacker might do. 2.
HackerSomeone who breaks into computer systems in order to steal, change or destroy information.
HacktivistAn individual who breaches Web sites or secured communications systems to deliver political messages, including those related to foreign policy, or…
Hadoop Distributed File System (HDFS)(HDFS)The HDFS file system stores large files across multiple machines. It achieves reliability by replicating the data across multiple hosts, and hence does…
Hagelbarger codeA convolutional code that enables error bursts to be corrected provided that there are relatively long error-free intervals between the error bursts.
HAL (Hardware Abstraction Layer)A layer between the physical hardware of a computer and the software that runs on that computer designed to hide differences in the underlying hardware…
halftone characteristicIn facsimile systems, the relationship between the density of the recorded copy and the density of the object, i.e., the original. 2.
Hallway pagea page that serves as an index to a group of pages that you would like the search engine spiders to find.
haltTo stop, in an orderly manner, all activity in a computer system.
hammeringA key search attack in which an unauthorized user guesses at a PIN or password many times.
Hamming codeAn error-detecting and error-correcting binary code, used in data transmission, that can (a) detect all single- and double-bit errors and (b) correct all…
Hamming DistanceThe number of non-corresponding digits in a string of binary digits; used to measure dissimilarity.
Hamming weightThe number of non-zero symbols in a symbol sequence. Note: For binary signaling, Hamming weight is the number of "1" bits in the binary sequence.
HAMSHardness Assurance, Maintenance and Surveillance.
Hand Geometry RecognitionA biometric modality that uses the physical structure of an individual�s hand for recognition purposes.
handleAn object that identifies an enterprise bean. A client can serialize the handle and then later deserialize it to obtain a reference to the enterprise bean.
HandlerA "subroutine" or "method" that is called by Perl when your program needs to respond to some internal event, such as a "signal", or an encounter with an…
handoffThis occurs when information on positions, velocities and tracks are given by one sensor or system to another and the first sensor or system continues to…
HandoverThis occurs when information is passed on to another sensor or system in which the first does not continue to track.
handshakingIn data communications, a sequence of events governed by hardware or software, requiring mutual agreement of the state of the operational modes prior to…
handshaking procedures[The] dialogue between two information systems for synchronizing, identifying, and authenticating themselves to one another. [INFOSEC-99]
hangWhen a computer freezes waiting for an event that will never occur.
hang-upCalling- or called-user placement of a telephone set or other unit of telecommunications equipment in the quiescent state. [T1.104-1988]
hang-up signalAn on-hook signal sent from an end office toward the disconnect-control office indicating either calling or called user hang-up and requesting the…
hardenedPertaining to the condition of a facility with protective features that enable it to withstand destructive forces, such as explosions, natural disasters…
HardeningDesign and manufacturing process and other measures, which may be employed to render military assets less vulnerable.
HARDMANHardware/Military Manpower Integration (Navy ILS term).
HardnessA characteristic of water determined by the levels of calcium and magnesium. Water hardness is largely the result of geological formations of the water…
hardwareThe physical components of a computer system-the computer, plotters, printers, terminals, digitizers, and so on.
Hardware Virtual Machine (HVM) virtualization(HVM)Lets the guest VM run as though it is on a native hardware platform, except that it still uses para-virtual (PV) network and storage drivers for improved…
hardware virtualizationThis technology was the starting point of the virtualization movement. Originally, the x86-architecture did not support virtualization.
hardware VPNA hardware-based IPsec VPN connection over the Internet.
Hardware-in-the- Loop (HWIL)Tests in which BM/C 3 computer and communication test systems will be in communication with some of the hardware test facilities developed for other BMD…
hardware-independenceby virtualizing the underlying hardware that an operating system interacts with, and with the proper virtual machine monitor and hypervisor, the operating…
harmful interferenceAny emission, radiation, or induction interference that endangers the functioning or seriously degrades, obstructs, or repeatedly interrupts a…
harmonicOf a sinusoidal wave, an integral multiple of the frequency of the wave. Note: The frequency of the sine wave is called the fundamental frequency or the…
harmonic distortionIn the output signal of a device, distortion caused by the presence of frequencies that are not present in the input signal.
HarmonizationThe proposed harmonizing of patent laws in different countries to produce essentially one, worldwide patent law.
HashA mathematical algorithm that represents a unique value for a given set of data, similar to a digital fingerprint.
hash codeA value returned by a hash function. A hash code can be used as an index into a random-access data structure, providing an efficient mapping between an…