39210 IEEE Dictionary IEEES
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`INTERACTIVE
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`IEEE 100
`The Authoritative Dictionary of
`IEEE Standards Terms
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`Seventh Edition
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`Published by
`Standards Information Network
`IEEE Press
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`39210 IEEE Dictionary IEEES
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`INTERACTIVE
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`39210 IEEE Dictionary IEEES
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`cooling system, natural-air
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`surfaces of the thyristor converter, is cooled in heat exchanger
`and recirculated. Note: Heat may be removed from the thyr-
`istor converter cooling surfaces by liquid or air using the fol-
`lowing types of heat exchangers: water-to-water, water-to-air,
`air-to-water, air-to-air, and refrigeration cycle. The liquid in
`the closed system may be other than water, and the gas in the
`closed system may be other than air.
`(IA/IPC) 444-1973w
`cooling system, natural-air (thyristor converter) An air cool-
`ing system in which heat is removed from the cooling surfaces
`of the thyristor converter only by the natural action of the
`ambient air.
`(IA/IPC) 444-1973w
`cooling system regulating equipment (thyristor) Any equip-
`ment used for heating and cooling the thyristor controller,
`together with the devices for controlling and indicating its
`temperature.
`(IA/IPC) 428-1981w
`cooling-water system (rotating machinery) All parts that are
`provided for the flow, treatment, or storage of cooling water.
`(PE) [9]
`coordinate dimension word (numerically controlled ma-
`chines) A word defining an absolute dimension.
`(IA/EEC) [61], [74]
`coordinated operation (1) Operation of generation and trans-
`mission facilities of two or more interconnected systems to
`achieve greater reliability and economy.
`(PE/PSE) 858-1993w
`(2) (hydro plants) Operation of a group of hydro plants and
`storage reservoirs so as to obtain optimum power benefits
`with due consideration to all other uses.
`(PE/PSE) 346-1973w
`(3) (electric power supply) Operation of generation and
`transmission facilities of two or more interconnected electri-
`cal systems to achieve greater reliability and economy.
`(PE/PSE) 346-1973w
`coordinated operation of hydroplants (power operations)
`Operation of a group of hydroplants and storage reservoirs so
`as to obtain optimum power benefits with due consideration
`to all other uses.
`(PE/PSE) 858-1987s
`coordinated transpositions (electric supply or communica-
`tion circuits) Transpositions that are installed for the purpose
`of reducing inductive coupling, and that are located effec-
`tively with respect to the discontinuities in both the electric
`supply and communication circuits. See also: inductive co-
`ordination.
`(PE/EEC) [119]
`COordinate GeOmetry (COGO) A problem-oriented pro-
`gramming language used to solve coordinate geometry prob-
`lems in civil engineering applications.
`(C) 610.13-1993w
`coordinates A set of data values that specify a location.
`(C) 610.6-1991w
`coordinate system (pulse terminology) Throughout the fol-
`lowing, a rectangular Cartesian coordinate system is assumed
`in which, unless otherwise specified:
`1) Time (t) is the independent variable taking alone the hor-
`izontal axis, increasing in the positive sense from left to
`right.
`2) Magnitude (m) is the dependent variable taken along the
`vertical axis, increasing the positive sense or polarity from
`bottom to top.
`3) The following additional symbols are used:
`a) e— The base of natural logarithms.
`b) a, b, c, etc.— Real constants that, unless otherwise spec-
`ified, may have any value and either sign.
`c) n— A positive integer.
`
`(Std100)
`coordinating entity (1) That part of an end system or inter-
`working unit (IWU) responsible for the coordination and syn-
`chronization of functions belonging to the data and signalling
`subentities of the layer entity implementing a PSN access
`protocol.
`(C/LM) 802.9a-1995w
`(2) That part of the Network Layer within an end system or
`interworking unit responsible for the coordination and syn-
`chronization of functions belonging to the Data and Signal-
`
`ling subentities of the layer entity implementing a PSN access
`protocol.
`(LM/C/COM) 8802-9-1996
`coordination dimension A reference dimension used to coor-
`dinate mechanical interfaces. This is not a manufacturing di-
`mension with a tolerance.
`(C/BA/MM) 1301.2-1993, 1301.4-1996, 1301.1-1991,
`1301.3-1992r
`coordination function The logical function that determines
`when a station operating within a basic service set (BSS) is
`permitted to transmit and may be able to receive protocol data
`units (PDUs) via the wireless medium (WM). The coordina-
`tion function within a BSS may have one point coordination
`function (PCF) and will have one distributed coordination
`function (DCF).
`(C/LM) 8802-11-1999
`coordination function pollable A station able to respond to a
`coordination function poll with a data frame, if such a frame
`is queued and able to be generated, and interpret acknowl-
`edgments in frames sent to or from the point coordinator.
`(C/LM) 8802-11-1999
`coordination of protection The process of choosing settings or
`time delay characteristics of protective devices, such that op-
`eration of the devices will occur in a specified order to min-
`imize customer service interruption and power system isola-
`tion due to a power system disturbance.
`(PE/PSR) C37.113-1999
`coplanar strip transmission line A planar transmission line
`consisting of two parallel thin conducting strips of finite
`width, separated by a finite gap and affixed to the same plane
`surface of an insulating substrate of arbitrary thickness.
`(MTT) 1004-1987w
`coplanar waveguide A planar transmission line consisting of a
`single thin conducting strip of finite width situated between
`two semi-infinite ground planes and separated from them by
`finite gaps, which are all affixed to the same plane surface of
`an insulating substrate of arbitrary thickness.
`(MTT) 1004-1987w
`co-polarization That polarization that the antenna is intended
`to radiate [receive]. See also: polarization pattern.
`(AP/ANT) 145-1993
`co-polar (radiation) pattern A radiation pattern corresponding
`to the co-polarization. See also: co-polarization.
`(AP/ANT) 145-1993
`copper brush (rotating machinery) A brush composed prin-
`cipally of copper. See also: brush.
`(PE) [9]
`copper-clad aluminum conductors Conductors drawn from a
`copper-clad aluminum rod with the copper metallurgically
`bonded to an aluminum core. The copper forms a minimum
`of 10 percent of the cross-sectional area of a solid conductor
`or each strand of a stranded conductor.
`(NESC/NEC) [86]
`copper-clad steel Steel with a coating of copper welded to it,
`as distinguished from copper-plated or copper-sheathed ma-
`terial.
`(EEC/PE) [119]
`copper-covered steel wire A wire having a steel core to which
`is bounded a continuous outer layer of copper. See also: con-
`ductor.
`(PE) [4], 64
`copper losses See: load losses.
`coprocessor (CP) (1) An optional processing unit (impl. dep.
`#4).
`(C/MM) 1754-1994
`(2) A processor used in conjunction with a central processing
`unit, designed to perform specific functions that may not be
`executed efficiently by the central processing unit, for ex-
`ample: a floating-point coprocessor.
`(C) 610.10-1994w
`coprocessor operate (CPop) instructions Instructions that per-
`form coprocessor calculations, as defined by the CPop1 and
`CPop2 opcodes. CPop instructions do not include CBccc in-
`structions, nor loads and stores between memory and the co-
`processor.
`(C/MM) 1754-1994
`copy (1) (A) (software) To read data from a source, leaving the
`source data unchanged, and to write the same data elsewhere
`in a physical form that may differ from that of the source. For
`example, to copy data from a magnetic disk onto a magnetic
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