<programming> A property of variables in a functional language. If a variable is only assigned a value once then an instance of that variable is thereafter semantically equivalent to the value. SISAL is an example of a language with this property.
See also zero assignment.
(2003-12-22)
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Nearby terms: Sinclair Radionics « Sinclair Research « sine wave « single assignment » single assignment language » single-attached » Single Connection Attach
<language> Any programming language with the single assignment property.
(2007-03-21)
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Connected to only one of the two rings of an FDDI network. This is the kind of connection normally used for a host computer, as opposed to routers and concentrators which are normally "dual-attached".
(1994-12-13)
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Nearby terms: sine wave « single assignment « single assignment language « single-attached » Single Connection Attach » Single Connector Attachment » Single Data Rate Random Access Memory
<hardware> (SCA, "Single Connector Attachment") A non-standard type of SCSI connector, used mostly by OEMs, which carries both power and data on one 80-pin connector. SCA SCSI drives tend to be cheaper but use with standard SCSI cables requires an adaptor and external termination.
http://pcmech.com/show/harddrive/152/.
(2003-06-21)
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Nearby terms: single assignment « single assignment language « single-attached « Single Connection Attach » Single Connector Attachment » Single Data Rate Random Access Memory » Single Data Rate Synchronous Dynamic Random Access Memory
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Nearby terms: single assignment language « single-attached « Single Connection Attach « Single Connector Attachment » Single Data Rate Random Access Memory » Single Data Rate Synchronous Dynamic Random Access Memory » Single Document Interface
<storage> (SDR-RAM, SDR-SDRAM, Single Data Rate Synchronous Dynamic Random Access Memory) RAM or SDRAM that transfers data on only one clock transition (0-1 or 1-0), in contrast to DDR-RAM.
(2001-05-24)
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Nearby terms: single-attached « Single Connection Attach « Single Connector Attachment « Single Data Rate Random Access Memory » Single Data Rate Synchronous Dynamic Random Access Memory » Single Document Interface » single-duplex
Single Data Rate Random Access Memory
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Nearby terms: Single Connection Attach « Single Connector Attachment « Single Data Rate Random Access Memory « Single Data Rate Synchronous Dynamic Random Access Memory » Single Document Interface » single-duplex » Single Edge Contact
<programming> (SDI) A limitation applying to an application program that only shows a single windows giving a view of one document at a time.
The opposite is Multiple Document Interface (MDI).
(1999-03-30)
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Nearby terms: Single Connector Attachment « Single Data Rate Random Access Memory « Single Data Rate Synchronous Dynamic Random Access Memory « Single Document Interface » single-duplex » Single Edge Contact » Single Edge Contact Cartridge
<communications> (From telegraphy) A full-duplex link with one telegrapher at each end, transmitting alternately in each direction.
(2000-03-30)
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Nearby terms: Single Data Rate Random Access Memory « Single Data Rate Synchronous Dynamic Random Access Memory « Single Document Interface « single-duplex » Single Edge Contact » Single Edge Contact Cartridge » Single Edge Processor Package
<hardware> (SEC) The type of cartridge in which a Pentium II is packaged.
[Other uses?]
(1999-02-15)
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Nearby terms: Single Data Rate Synchronous Dynamic Random Access Memory « Single Document Interface « single-duplex « Single Edge Contact » Single Edge Contact Cartridge » Single Edge Processor Package » single-electron transistor
<hardware> (SEC, SECC) The cased daughterboard housing Intel's Pentium II, Pentium III, and Xeon microprocessors.
A SECC fits into a Slot 1 or Slot 2 connector.
[SECC 2?]
(1999-08-05)
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Nearby terms: Single Document Interface « single-duplex « Single Edge Contact « Single Edge Contact Cartridge » Single Edge Processor Package » single-electron transistor » Single Electron Tunneling
<hardware> (SEPP) The caseless daughterboard containing Intel's Celeron processor. A SEPP fits into a Slot 1 connector.
(1999-08-04)
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Nearby terms: single-duplex « Single Edge Contact « Single Edge Contact Cartridge « Single Edge Processor Package » single-electron transistor » Single Electron Tunneling » Single Electron Tunneling Technology
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Nearby terms: Single Edge Contact « Single Edge Contact Cartridge « Single Edge Processor Package « single-electron transistor » Single Electron Tunneling » Single Electron Tunneling Technology » single ended
<electronics> (SET) A New electrical standard for capacitance.
SET devices can be used to construct circuits which process information by manipulating individual electrons. SET devices are small, dissipate little power, and can detect exquisitely small quantities of charge. The small size and low power dissipation of SET circuits makes them potentially useful for the Information Technology industry.
(1999-01-06)
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Nearby terms: Single Edge Contact Cartridge « Single Edge Processor Package « single-electron transistor « Single Electron Tunneling » Single Electron Tunneling Technology » single ended » Single Image Random Dot Stereogram
<hardware> A neural network hardware concept based on single electron tunneling. Single electron tunneling transistors have some properties which make them attractive for neural networks, among which their small size, low power consumption and potentially high speed.
Simulations have been performed on some small circuits of SET transistors that exhibit functional properties similar to those required for neural networks.
http://computer.org/conferen/proceed/mn96/ABSTRACT.HTM#125.
[Proceedings of the Fifth International Conference on Microelectronics for Neural Networks and Fuzzy Systems (MicroNeuro '96). Martijn J. Goossens, Chris J.M. Verhoeven, and Arthur H.M. van Roermund].
(1999-01-06)
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Nearby terms: Single Edge Processor Package « single-electron transistor « Single Electron Tunneling « Single Electron Tunneling Technology » single ended » Single Image Random Dot Stereogram » single inheritance
<hardware> An electrical connection where one wire carries the signal and another wire or shield is connected to electrical ground. This is in contrast to a differential connection where the second wire carries an inverted signal.
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Nearby terms: single-electron transistor « Single Electron Tunneling « Single Electron Tunneling Technology « single ended » Single Image Random Dot Stereogram » single inheritance » Single In-line Memory Module
<graphics> (SIRDS, originally "autostereogram") A stereogram composed of (coloured) dots which when viewed correctly appears three-dimensional. SIRDs were invented by Dr. Christoper Tyler, Associate Director of the Smith-Kettlewell Eye Research Institute in San Francisco (1999).
FAQ. Nice pictures. Picture Gallery. Vern Hart's SIRDS Gallery. SGI Gallery.
(1996-11-06)
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Nearby terms: Single Electron Tunneling « Single Electron Tunneling Technology « single ended « Single Image Random Dot Stereogram » single inheritance » Single In-line Memory Module » Single Inline Pin Package
The property of an object-oriented language which restricts a sub-class to be derived from only one parent. Opposite of multiple inheritance.
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Nearby terms: Single Electron Tunneling Technology « single ended « Single Image Random Dot Stereogram « single inheritance » Single In-line Memory Module » Single Inline Pin Package » Single Instruction Multiple Data
<storage> (SIMM) A small circuit board or substrate, typically about 10cm x 2cm, with RAM integrated circuits or die on one or both sides and a single row of pins along one long edge. Several SIMMs are mounted with their substrates at right-angles to the main circuit board (the motherboard). This configuration allows greater packing density than direct mounting of, e.g. DIL (dual in-line) RAM packages on the motherboard. In 1993 one SIMM typically held one or four megabytes, by early 1997 one could hold 8, 16, or 32 MB.
(1997-01-05)
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Nearby terms: single ended « Single Image Random Dot Stereogram « single inheritance « Single In-line Memory Module » Single Inline Pin Package » Single Instruction Multiple Data » Single Instruction/Multiple Data
<hardware> (SIPP) An integrated circuit package with a single line of pins.
Compare Dual Inline Package, Single In-line Memory Module.
(1995-03-01)
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Nearby terms: Single Image Random Dot Stereogram « single inheritance « Single In-line Memory Module « Single Inline Pin Package » Single Instruction Multiple Data » Single Instruction/Multiple Data » Single-line Digital Subscriber Line
Single Instruction/Multiple Data
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(SIMD) (Or "data parallel") The classification under Flynn's taxonomy for a parallel processor where many processing elements (functional units) perform the same operations on different data. There is often a central controller which broadcasts the instruction stream to all the processing elements.
Contrast Multiple Instruction/Multiple Data.
(1994-11-04)
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Nearby terms: Single In-line Memory Module « Single Inline Pin Package « Single Instruction Multiple Data « Single Instruction/Multiple Data » Single-line Digital Subscriber Line » Single-pair High Speed Digital Subscriber Line » single program/multiple data
<communications, protocol> (SDSL, or Single-pair High Speed Digital Subscriber Line, S-HDSL) A form of Digital Subscriber Line similar to HDSL but providing T1 or E1 connections over a single twisted-pair copper line.
(1998-05-18)
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Nearby terms: Single Inline Pin Package « Single Instruction Multiple Data « Single Instruction/Multiple Data « Single-line Digital Subscriber Line » Single-pair High Speed Digital Subscriber Line » single program/multiple data » single quote
Single-line Digital Subscriber Line
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Nearby terms: Single Instruction Multiple Data « Single Instruction/Multiple Data « Single-line Digital Subscriber Line « Single-pair High Speed Digital Subscriber Line » single program/multiple data » single quote » single sign-on
<parallel, architecture> (SPMD) A kind of parallel processing where the same program is run on multiple processors. Every instance of the program knows which part of the computation it should perform and the results of the computation are combined somehow.
(2002-04-21)
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Nearby terms: Single Instruction/Multiple Data « Single-line Digital Subscriber Line « Single-pair High Speed Digital Subscriber Line « single program/multiple data » single quote » single sign-on » single sourcing
<character> "'" ASCII character 39.
Common names include single quote; quote; ITU-T: apostrophe. Rare: prime; glitch; tick; irk; pop; INTERCAL: spark; ITU-T: closing single quotation mark; ITU-T: acute accent.
Single quote is used in C and derived languages to introduce a single character literal value which is represented internally by its ASCII code. In the Unix shells and Perl single quote is used to delimit strings in which variable substitution is not performed (in contrast to double-quote-delimited strings).
Single quote is often used in text for both open and close single quotation mark and apostrophe. Typesetters use two different symbols - open has a tail going up, close and apostrophe have tails hanging down (like a raised comma). Some people use back quote (`) for open single quotation mark.
(1998-04-04)
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Nearby terms: Single-line Digital Subscriber Line « Single-pair High Speed Digital Subscriber Line « single program/multiple data « single quote » single sign-on » single sourcing » single static assignment
<security> (SSO) Any user authentication system permiting users to access multiple data sources through a single point of entry. Part of an integrated access management framework.
(2003-12-31)
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<publication> Using a single original document set to generate dead tree and on-line documentation, and usually also on-line help. In practice, it most often refers to a FrameMaker file set with conditional text which, when the conditions are set appropriately, allows you to create variants of the original document (e.g., for a product that runs on different Unix platforms) as well as for different media -- typically task-oriented on-line help to be accessed under Microsoft Windows or from a web browser, linear printed document, and HTML delivered via the WWW and/or CD-ROM.
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Nearby terms: single program/multiple data « single quote « single sign-on « single sourcing » single static assignment » singleton variable » Single Virtual Storage
<compiler> (Also known as SSA form) A special form of code where each variable has only one single definition in the program code. "Static" comes from the fact that the definition site may be in a loop, thus dynamically executed several times.
SSA form is used for program optimization or static analysis and optimisation.
(2003-04-12)
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<programming> A variable which is only referred to once in a piece of code, probably because of a programming mistake. To be useful, a variable must be set and read from, in that order. If it is only referred to once then it cannot be both set and read.
There are various exceptions. C-like assignment operators, e.g. "x += y", read and set x and return its new value (they are abbreviations for "x = x+y", etc). A function argument may be passed only for the sake of uniformity or to support future enhancements. A good compiler or a syntax checker like lint should report singleton variables but also allow specific instances to be marked as deliberate by the programmer.
(1997-12-20)
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Nearby terms: single sign-on « single sourcing « single static assignment « singleton variable » Single Virtual Storage » siod » SIP
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