Page 201 - Electrical Engineering Dictionary

lable and observable, and uncontrollable and −A 2 − B 1 K 2
z
unobservable parts. See also controllability. I n 2 2 − A 4 − B 2 K 2

5. For matrix transfer functions, decom- B 1
× H
position transforms it to the form composed B 2
of specific blocks used in chosen design pro-
h
cedure. See also H infinity design. is diagonal and nonsingular, where x ∈ R n 1
ij
(2) in fuzzy systems, if the fuzzy relation and x v ∈ R n 2 are horizontal and vertical
ij
R is a composition of the fuzzy relations A state vectors, respectively, and u ij ∈ R m is
and B, then the determination of A given B the input vector, v ij ∈ R m is a new input
p
and R is referred to as a decomposition of R vector, y ij ∈ R is the output vector, and
with respect to B. A 1 , A 2 , A 3 , A 4 , B 1 , B 2 , C 1 , C 2 , are given
real matrices.
decorrelation the act of removing or
reducing correlation between random vari- decrement to reduce the value of a vari-
ables. For random vectors a discrete linear ableorcontentofaregisterbyafixedamount,
transform is often used to reduce the correla- normally one.
tion between the vector components.
decryption a process, implemented in
decorrelator a linear code-division multi- hardware or software, for reconstructing data
ple-access receiver, which takes the data vec- previously coded by using a cryptography al-
tor output from a bank of filters matched to gorithm, that is encrypted data. These al-
the desired users’ spreading sequences, and gorithms are typically based on keywords or
multiplies by a matrix which is the inverse of codes.
the spreading-sequence correlation matrix.
DECT See digital European cordless
decoupled load flow a load-flow study in
telephone.
which certain simplifying assumptions per-
mit an accelerated solution. deep-bar rotor a squirrel-cage induction
motor rotor in which the rotor bars are deep
decoupling problem for 2-D linear systems
and narrow, to make the effective resistance,
given the 2-D Roesser model
and therefore the torque, higher at starting.
" h # " h #
x x
i+1,j = A 1 A 2 ij + B 1
x v A 3 A 4 x v B 2 u ij deep-UV lithography lithography using
i,j+1 ij
light of a wavelength in the range of about
" #
x h 150 nm to 300 nm, with about 250 nm being

ij
y ij = C 1 C 2 v
x the most common.
ij
i, j ∈ Z + (the set of nonnegative integers), default the value or status that is assumed
find matrices K = [K 1 ,K 2 ] and H(detH 6= unless otherwise specified.
0) of the control law
" h # deferredaddressing Seeindirectaddress-
x ij
u ij = K v + Hv ij i, j ∈ Z + ing.
x
ij
such that the transfer function matrix of the deferred evaluation a scheduling policy
closed-loop system under which a task is not scheduled until it
has been determined that the results of that

task are required by another task that is in
T c (z 1 ,z 2 ) = C 1 C 2

z
I n 1 1 − A 1 − B 1 − K 1 execution and cannot proceed without these
×
−A 3 − B 2 − K 1 results.
c
2000 by CRC Press LLC