18,354 research outputs found
Interval type-2 fuzzy automata and Interval type-2 fuzzy grammar
The purpose of the present work is to introduce and study the concept of interval
type-2 (IT2) fuzzy grammar which recognizes the given IT2 fuzzy languages. The
relationship between IT2 fuzzy automata and IT2 fuzzy (weak) regular grammars is
discussed. Specifically, the results we obtained here are (i ) IT2 fuzzy weak regular
grammar and IT2 fuzzy regular grammar generate the same classes of IT2 fuzzy
languages (ii ) for a given IT2 fuzzy regular grammars, there exists an IT2 fuzzy
automata such that they accept the same IT2 fuzzy languages, and vice versa. In
addition, we define some operations on IT2 fuzzy languages and it is shown that IT2
fuzzy languages recognized by IT2 fuzzy automata are closed under the operations
of union, intersection, concatenation and Kleene closure, but are not closed under
complement
Microring coupled-resonator optical waveguides
We use transfer matrices to obtain the dispersion relations of microring coupled-resonator optical waveguides (CROWs). We also analyze pulse propagation through finite and semi-infinite microring CROWs. The results agree well with FDTD simulations
Designing coupled-resonator optical waveguide delay lines
We address the trade-offs among delay, loss, and bandwidth in the design of coupled-resonator optical waveguide (CROW) delay lines. We begin by showing the convergence of the transfer matrix, tight-binding, and time domain formalisms in the theoretical analysis of CROWs. From the analytical formalisms we obtain simple, analytical expressions for the achievable delay, loss, bandwidth, and a figure of merit to be used to compare delay line performance. We compare CROW delay lines composed of ring resonators, toroid resonators, Fabry-Perot resonators, and photonic crystal defect cavities based on recent experimental results reported in the literature
Coupled Resonator Optical Waveguides: Toward the Slowing and Storage of Light
The development of a simple, solid-state-based technology to slow the propagation of light could prove an important step in the realization of the high-bit-rate communication systems of the future. The use of coupled resonator optical waveguides (CROWs) as practical elements to slow and store light pulses is one possibility
Studies on nonisothermal solid state galvanic cells — effect of gradients on EMF
An expression for the EMF of a nonisothermal galvanic cell, with gradients in both temperature and chemical potential across a solid electrolyte, is derived based on the phenomenological equations of irreversible thermodynamics. The EMF of the nonisothermal cell can be written as a sum of the contributions from the chemical potential gradient and the EMF of a thermocell operating in the same temperature gradient but at unit activity of the neutral form of the migrating species. The validity of the derived equation is confirmed experimentally by imposing nonlinear gradients of temperature and chemical potential across galvanic cells constructed using fully stabilized zirconia as the electrolyte. The nature of the gradient has no effect on the EMF
Impact of the introduction of commercial purse- seine operations on the traditional fisheries of the Karnataka coast in India
It was during 1977 that large -scale operation of purse – seines started in India mostly along the Karnataka coast. No doubt this has
substantially increased the marine fish landings , especially mackerel and sardines . But it has affected the traditional Rampani fishing which
also exploits the same fishery resources . The paper makes an impact analysis of this development
- …