We pres ent a new "knowledge-based nonuniform crossover" opera tor for genet ic algorit hms that generalizes uniform crossover. We ext end this to "Dynamic knowledge-based nonuniform crossover ," which const antly updates the knowledge ext racted t hus far from the environment 's feedb ack on previously generated chromosomes. Knowledge-based nonu niform crossover can improve on good solutions p...

Genetic Algorithms are biologically inspired optimization algorithms. Performance of genetic algorithms mainly depends on type of genetic operators – Selection, Crossover, Mutation and Replacement used in it. Crossover operators are used to bring diversity in the population. This paper studies different crossover operators and then proposes a hybrid crossover operator that incorporates knowledg...

Recently, genetic algorithms (GAs) and their hybrids have achieved great success in solving difficult combinatorial optimization problems. In this paper, the issues related to the performance of the genetic search in the context of the grey pattern problem (GPP) are discussed. The main attention is paid to the investigation of the solution recombination, i.e., crossover operators which play an ...

A circular patch based crossover is presented in the paper. The proposed crossover provides an isolation better than -22dB and transmission of 0dB in the band of operation. This crossover is compared with a rectangular patch based crossover operating at same frequency.

OBJECTIVES Under the prevailing conditions of imbalanced life table and historic gender discrimination in India, our study examines crossover between life expectancies at ages zero, one and five years for India and quantifies the relative share of infant and under-five mortality towards this crossover. METHODS We estimate threshold levels of infant and under-five mortality required for crosso...

During chemical reactions, molecules interact to produce new molecules. Some of the reaction mechanisms are very close to the way gene combine to produce new genes. Like the classical genetic crossover operator, chemical crossover occurs when two molecules exchange the atomic material they are composed of. Molecules do so in order to produce new and more stable molecules. Several differences ex...

We study sample-to-sample fluctuations of the gap ratio in energy spectra finite disordered spin chains. The chains are described by random-field Ising model and Heisenberg model. show that away from ergodic-nonergodic crossover, correctly captured Rosenzweig-Porter (RP) However, microscopic models significantly exceed those RP vicinity crossover. upon introducing an extension to model, one rep...

This paper discusses recent NQR/NMR studies performed on Y-Ba-Cu-0 superconductors at the University of Zürich. The work is concerned with normal state properties which are still controversial, for instance the spin-gap effect, i.e. the opening of a pseudo gap in the electron spin excitation spectrum at a temperature 7*, which lies above Tc. We will report on the detection of "anomalies" which ...