42,881 research outputs found
Firefly Algorithm, Stochastic Test Functions and Design Optimisation
Modern optimisation algorithms are often metaheuristic, and they are very
promising in solving NP-hard optimization problems. In this paper, we show how
to use the recently developed Firefly Algorithm to solve nonlinear design
problems. For the standard pressure vessel design optimisation, the optimal
solution found by FA is far better than the best solution obtained previously
in literature. In addition, we also propose a few new test functions with
either singularity or stochastic components but with known global optimality,
and thus they can be used to validate new optimisation algorithms. Possible
topics for further research are also discussed.Comment: 12 pages, 11 figure
Nonlinear Viscoelastic Compaction in Sedimentary Basins
In the mathematical modelling of sediment compaction and porous media flow,
the rheological behaviour of sediments is typically modelled in terms of a
nonlinear relationship between effective pressure and porosity ,
that is . The compaction law is essentially a poroelastic one.
However, viscous compaction due to pressure solution becomes important at
larger depths and causes this relationship to become more akin to a viscous
rheology. A generalised viscoelastic compaction model of Maxwell type is
formulated, and different styles of nonlinear behaviour are asymptotically
analysed and compared in this paper
Review of Metaheuristics and Generalized Evolutionary Walk Algorithm
Metaheuristic algorithms are often nature-inspired, and they are becoming
very powerful in solving global optimization problems. More than a dozen of
major metaheuristic algorithms have been developed over the last three decades,
and there exist even more variants and hybrid of metaheuristics. This paper
intends to provide an overview of nature-inspired metaheuristic algorithms,
from a brief history to their applications. We try to analyze the main
components of these algorithms and how and why they works. Then, we intend to
provide a unified view of metaheuristics by proposing a generalized
evolutionary walk algorithm (GEWA). Finally, we discuss some of the important
open questions.Comment: 14 page
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