Technology terms starting with H

472 terms

  1. .htaccess Apache directory-level configuration file which can be used to password protect or redirect files. As a note of caution, make sure you copy your current .
  2. H Prefix used to designate the human form of an enzyme. For example, hGH is human growth hormone.
  3. H release Hardware-specific release. A software product that is restricted to run on an identified platform or subset of platforms.
  4. H&S Health and Status.
  5. H-bend A 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…
  6. H-channel In Integrated Services Digital Networks (ISDN), a 384-kb/s, 1472-kb/s, or 1536-kb/s channel, designated as "H0", "H10", and "H11", respectively…
  7. H-plane bend Synonym H-bend.
  8. H/W Hardware.
  9. HA Higher Authority.
  10. HA (High Availability) A combination of technology, processes, and support partnerships that provide greater application or system availability.
  11. HA1-receiver weighting A noise weighting used in a noise measuring set to measure noise across the HA1-receiver of a 302-type or similar instrument.
  12. HABE High Altitude Balloon Experiment.
  13. HAC Abbreviation for human artificial chromosome.
  14. hack 1. To break into or use a computer network or use a system without authorization, as a hacker might do. 2.
  15. Hacker Someone who breaks into computer systems in order to steal, change or destroy information.
  16. Hacktivist An individual who breaches Web sites or secured communications systems to deliver political messages, including those related to foreign policy, or…
  17. Hadoop See http://hadoop.apache.org.
  18. Hadoop Distributed File System (HDFS) The HDFS file system stores large files across multiple machines. It achieves reliability by replicating the data across multiple hosts, and hence does…
  19. HADS High Altitude Defense System.
  20. Hagelbarger code A convolutional code that enables error bursts to be corrected provided that there are relatively long error-free intervals between the error bursts.
  21. 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…
  22. HALE High Altitude Long-Endurance.
  23. HALE UAV High Altitude Long Endurance Unmanned Aerial Vehicle.
  24. half-duplex (HDX) operation Operation in which communication between two terminals occurs in either direction, but in only one direction at a time.
  25. Half-Value Thickness (HVT) The thickness of a given material, which will absorb half the gamma radiation incident upon it.
  26. Halftone See Dithering.
  27. halftone characteristic In facsimile systems, the relationship between the density of the recorded copy and the density of the object, i.e., the original. 2.
  28. Hallway page a page that serves as an index to a group of pages that you would like the search engine spiders to find.
  29. HALO II High Altitude Observatory II
  30. halt To stop, in an orderly manner, all activity in a computer system.
  31. hammering A key search attack in which an unauthorized user guesses at a PIN or password many times.
  32. Hamming code An 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…
  33. Hamming Distance The number of non-corresponding digits in a string of binary digits; used to measure dissimilarity.
  34. Hamming weight The 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.
  35. HAMS Hardness Assurance, Maintenance and Surveillance.
  36. Hand Geometry Recognition A biometric modality that uses the physical structure of an individual�s hand for recognition purposes.
  37. handle An 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.
  38. Handler A "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…
  39. handoff This 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…
  40. Handover This occurs when information is passed on to another sensor or system in which the first does not continue to track.
  41. handshaking In data communications, a sequence of events governed by hardware or software, requiring mutual agreement of the state of the operational modes prior to…
  42. handshaking procedures [The] dialogue between two information systems for synchronizing, identifying, and authenticating themselves to one another. [INFOSEC-99]
  43. hang When a computer freezes waiting for an event that will never occur.
  44. hang-up Calling- or called-user placement of a telephone set or other unit of telecommunications equipment in the quiescent state. [T1.104-1988]
  45. hang-up signal An on-hook signal sent from an end office toward the disconnect-control office indicating either calling or called user hang-up and requesting the…
  46. hangover Synonym tailing.
  47. HAOI High Altitude Optical Imaging.
  48. HAOIS High Altitude Optical Imaging System.
  49. HAP High Altitude Probe.
  50. hard copy Synonymous with paper
  51. Hard disk A magnetic disk on which data can be stored.
  52. Hard Disk Storage (HDS) or Hard Drives (HD) the storage componet of Cloud computing requires that data be online for real-time access by remote users.
  53. Hard Kill (HK) Destruction of a target in such a way as to produce unambiguous visible evidence of its neutralization.
  54. hard limiting See limiting.
  55. hard reference A "scalar" "value" containing the actual address of a "referent", such that the referent's "reference" count accounts for it.
  56. hard sectoring In magnetic or optical disk storage, sectoring that uses a physical mark on the disk, from which mark sector locations are referenced.
  57. hard-copy key [A] physical keying material, such as printed key lists, punched or printed key tapes, or programmable, read-only memories (pROM). [INFOSEC-99]
  58. hard-drawn copper wire Copper wire that has not been annealed after being drawn.
  59. hardened Pertaining to the condition of a facility with protective features that enable it to withstand destructive forces, such as explosions, natural disasters…
  60. Hardening Design and manufacturing process and other measures, which may be employed to render military assets less vulnerable.
  61. HARDMAN Hardware/Military Manpower Integration (Navy ILS term).
  62. Hardness A characteristic of water determined by the levels of calcium and magnesium. Water hardness is largely the result of geological formations of the water…
  63. hardware The physical components of a computer system-the computer, plotters, printers, terminals, digitizers, and so on.
  64. hardware platform Synonym platform.
  65. Hardware Security Computer equipment features or devices used in an ADP system to preclude unauthorized access to data or system resources.
  66. hardware virtual machine See Full virtualization
  67. Hardware Virtual Machine (HVM) virtualization 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…
  68. hardware virtualization This technology was the starting point of the virtualization movement. Originally, the x86-architecture did not support virtualization.
  69. Hardware Virtualization Assist See Virtualization Assist.
  70. hardware VPN A hardware-based IPsec VPN connection over the Internet.
  71. 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…
  72. hardware-independence by virtualizing the underlying hardware that an operating system interacts with, and with the proper virtual machine monitor and hypervisor, the operating…
  73. Hardware-level virtualization See full virtualization.
  74. hardwire To connect equipment or components permanently in contrast to using switches, plugs, or connectors. 2.
  75. hardwired key [A] permanently installed key. [INFOSEC-99]
  76. HARM High Speed Anti-Radiation Missile. 125
  77. harmful interference Any emission, radiation, or induction interference that endangers the functioning or seriously degrades, obstructs, or repeatedly interrupts a…
  78. harmonic Of 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…
  79. harmonic distortion In the output signal of a device, distortion caused by the presence of frequencies that are not present in the input signal.
  80. Harmonization The proposed harmonizing of patent laws in different countries to produce essentially one, worldwide patent law.
  81. has-a relationship See aggregation.
  82. HASC House Armed Services Committee (US).
  83. Hash A mathematical algorithm that represents a unique value for a given set of data, similar to a digital fingerprint.
  84. hash code A 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…
  85. Hash Function A function used to create a hash value from binary input. The hash is substantially smaller than the text itself, and is generated by the hash function in…
  86. hash table A data structure used internally by Perl for implementing associative arrays (hashes) efficiently. See also "bucket".
  87. hash total The result obtained by subjecting a set of data to an algorithm for purposes of checking the data at the time the algorithm is applied or for use at a…
  88. hash value In cryptography, the result of applying a cryptologic hash function to a message. [After X9.31]
  89. Hash-based Message Authentication Code (HMAC) A specific construction for calculating a message authentication code (MAC) involving a cryptographic hash function in combination with a secret key.
  90. Hashing The process of using a mathematical algorithm against data to produce a numeric value that is representative of that data.
  91. hashword [The] memory address containing [a] hash total. [INFOSEC-99]
  92. HASP Hardened Ada Signal Processor.
  93. HATELM High-speed Anti-TEL Missile.
  94. HATMD High-Altitude Theater Missile Defense. (U.S. Army)
  95. HAVE STARE Name assigned a proven sensor capability.
  96. HAWK Homing All-the-Way Killer.
  97. Hawkeye A monitoring service for Condor Pools. See http://www.cs.wisc.edu/condor/hawkeye/.
  98. hazards of electromagnetic radiation to fuel (HERF) The potential for electromagnetic radiation to cause ignition or detonation of volatile combustibles, such as aircraft fuels.
  99. hazards of electromagnetic radiation to ordnance (HERO) The potential for electromagnetic radiation to affect adversely munitions or electroexplosive devices.
  100. hazards of electromagnetic radiation to personnel (HERP) The potential for electromagnetic radiation to produce harmful biological effects in humans.