Logic Learning in Hopfield Networks

Synaptic weights for neurons in logic programming can be calculated either by using Hebbian learning or by Wan Abdullah's method. In other words, Hebbian learning for governing events corresponding to some respective program clauses is equivalent with learning using Wan Abdullah's method for the same respective program clauses. In this paper we will evaluate experimentally the equivalence between these two types of learning through computer simulations.Comment: To appear in Mod. Appl. Sc

All-optical switching in metamaterial with high structural symmetry

We argue the possibility of realization of a polarization insensitive all-optical switching in a planar metamaterial composed of a 4-fold periodic array of two concentric metal rings placed on a substrate of nonlinear material. It is demonstrated that a switching may be achieved between essentially different values of transmission near the resonant frequency of the high-quality-factor Fano-shape trapped-mode excitation.Comment: 7 pages, 3 figure

Trapped-Mode Resonances in Planar Metamaterials with High Structural Symmetry

We propose a new type of planar metamaterials that can support high-Q electromagnetic modes, namely trapped modes, excitation of which is polarization insensitive

Planar chiral metamaterials

This article discusses some properties of planar chiral metamaterials. The polarization transformations due to the effect of planar chiral circular conversion dichroism on planar chiral periodic structures is taken for example. The behavior of an anisotropic chiral array of uninterrupted strips is studied

Non-reciprocal polarization effects in diffraction by planar chiral array

We found apparent nonreciprocity in the polarization transformation of a wave diffracted by a planar-chiral double periodic array

Multiplicative measure of planar chirality for 2D meta-materials

We describe a new efficient continuous geometrical measure of two-dimensional chirality for photonic and microwave planar meta-materials. Its properties include integrability, scale-independence, boundedness to a well defined interval and flexibility as well as applicability towards an extensive number of chiral geometries. The chirality measures of various arrangements of standard chiral and achiral template structures are evaluated and a method for the characterization of (infinite) periodic structures is suggested