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The thermal drift of the characteristic wavelength of fiber Bragg gratings (FBGs) photowritten in the core of microstructured fibers (MOFs) is significantly reduced by inserting a liquid of suitable refractive index into their holes. For instance, the spectral range of variations is divided by a factor of 4 over a temperature range larger than 20degC in a six-hole MOF, and the maximum sensitivity...
We address the graph isomorphism problem and related fundamental complexity problems of computational group theory. The main results are these: A1. A polynomial time algorithm to test simplicity and find composition factors of a given permutation group (COMP). A2. A polynomial time algorithm to find elements of given prime order p in a permutation group of order divisible by p. A3. A polynomial time...
This paper is concerned with infinite state probabilistic transition tables, representing the dynamical behavior of a probabilistic automaton and nonhomogeneous infinite-state Markov chains. Many known theorems are generalized from the finite state case to the infinite state case. A possible application to the problem of computing, approximately, products of infinite state stochastic matrices is outlined.
Many machines can be decomposed into a linear cascade of identical sequential machines. We consider the problem of implementing fault detection experiments for such machines. Cascade equivalence and information lossless properties of cascade machines are studied. Sufficient conditions for efficient testing of these machines are derived. Procedures are presented for testing cascades of arbitrary length...
The inherent problems of data transmission in a strictly feedforward line have been discussed in the literature. In such a line, where the stored data are indexed forward by control pulses moving in a direction away from the data source, if time variations exist in the delays of successive stages then there is always a nonzero probability that two successive control pulses will eventually appear at...
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