Page 160 - Electrical Engineering Dictionary

Computer torque control.

is equal to twice the mirror curvature; mirrors these flags to determine whether to branch or
have a common center of curvature. not.

concept formation the process of the in- condition code register register that con-
cremental unsupervised acquisition of cate- tains the bits that are the condition codes for
gories and their intentional descriptions. the CPU arithmetic or compare instructions.
The representative concept formation sys-
tems include EPAM, CYRUS, UNIMEM, condition variable a variable set as the
COBWEB,andSGNN.Seealsoself-generat- result of some arithmetic or logical compar-
ing neural network. ison.

concurrency the notion of having multi- conditionability of generalized 2-D model
ple independent tasks available (tasks in this a mathematical relationship of interest in
definition means any work to be done, not a control systems.
formal computational entity). The generalized 2-D model

concurrent processing having one log- Ex i+1,j+1 = A 0 x ij + A 1 x i+1,j
ical machine (which may be a multiproces- + A 2 x i,j+1 + B 0 u ij
sor) execute two or more independent tasks
+ B 1 u i+1,j + B 2 u i,j+1
simultaneously.
is called conditionable if no two distinct so-
concurrent read and concurrent write lutions to the model for the same input se-
(CRCW) shared memory model, in quence u ij for (i, j) ∈ [0,N 1 ] × [0,N 2 ]
which concurrent reads and writes are al- coincide in all their boundary values ( See
lowed. boundary values of 2-D general model),
n
where x ij ∈ R is the semistate vector u ij ∈
concurrent read and exclusive write R m is the input vector and E, A k ,B k (k =
(CREW) shared memory model, in which 0, 1, 2) are real matrices with E possibly sin-
concurrentreadsbutonlyexclusivewritesare gular or rectangular.
allowed.
conditional coding an approach to the so-
condenser lens lens system in an optical lution of the problem of large code words and
projection system that prepares light to illu- lookup tables in block coding. In this scheme
minate the mask. one assumes that the receiver already knows
the components b 1 ,b 2 ,...b N−1 of N-tuple
condition code internal flag used in the b. Current component b N can now be coded
construction of CPUs. Many computers pro- using this information. The assumption that
vide a mechanism for saving the character- there is statistical dependence between pixels
istics of results of a particular calculation. is made.
Such characteristics as sign, zero result, carry
or borrow, and overflow are typical of inte- conditional instruction an instruction
ger operations. The program may reference that performs its function only if a certain

c
2000 by CRC Press LLC