High Availability, or HA as it is abbreviated, refers to the availability of resources in a computer system, in the wake of component failures in the system. This can be achieved in a variety of ways, spanning the entire spectrum ranging at the one end from solutions that use custom and redundant hardware to ensure availability, to the other end to solutions that provide software solutions using off-the-shelf hardware components. The former class of solutions provide a higher degree of availability, but are significantly more expensive, than the latter class. This has led to the popularity of the latter class, with almost all vendors of computer systems offering various HA products. Typically, these products survive single points of failure in the system. [Source: IEEE Task Force on Cluster Computing]
- High Dynamic Range
See under High Dynamic Range Imaging (HDRI).
- High Dynamic Range Imaging
Short for High Dynamic Range Imaging, HDRI is an imaging technique that allows for a greater dynamic range of exposure than would be obtained through any normal imaging process. HDRI is now more commonly used for real photograph scenes where, for example, a large range of exposures would be found between sunlight and shadows. However, […]
- high-performance computing
(n.) A branch of computer science that concentrates on developing supercomputers and software to run on supercomputers. A main area of this discipline is developing parallel processing algorithms and software: programs that can be divided into little pieces so that each piece can be executed simultaneously by separate processors.
- High Speed Packet Access
Abbreviated as HSPA, High Speed Packet Access is a set of mobile telephony protocols that includes two popular standards; HSDPA (High Speed Downlink Packet Access) and HSUPA (High Speed Uplink Packet Access).
Short for high performance radio local area network. Developed by the European Telecommunications Standards Institute, HiperLAN is a set of WLAN communication standards used chiefly in European countries. HiperLAN is similar to the IEEE 802.11 WLAN standards used in the U.S. There are two types of HiperLAN: HiperLAN/1: provides communications at up to 20 Mbps […]