7,751 research outputs found
Doubly connected V-states for the generalized surface quasi-geostrophic equations
In this paper, we prove the existence of doubly connected V-states for the
generalized SQG equations with They can be described by
countable branches bifurcating from the annulus at some explicit "eigenvalues"
related to Bessel functions of the first kind. Contrary to Euler equations
\cite{H-F-M-V}, we find V-states rotating with positive and negative angular
velocities. At the end of the paper we discuss some numerical experiments
concerning the limiting V-states.Comment: 65 page
An analytical and numerical study of steady patches in the disc
In this paper, we prove the existence of -fold rotating patches for the
Euler equations in the disc, for both simply-connected and doubly-connected
cases. Compared to the planar case, the rigid boundary introduces rich dynamics
for the lowest symmetries and . We also discuss some numerical
experiments highlighting the interaction between the boundary of the patch and
the rigid one.Comment: 56 page
Performance analysis of a security architecture for active networks in Java
Internacional Association of Science and Technology for Development - IASTED, Benalmadena, Spain: 8-10 Septiembre, 2003.Active network technology supports the deployment and execution on the fly of new active services, without interrupting the network operation. Active networks are
composed of special nodes (named Active Router) that are able to execute active code to offer the active services. This technology introduces some security threats that must be solved using a security architecture. We have developed a security architecture (ROSA) for an active network platform (SARA). Java has been used as
programming language in order to provide portability, but it imposes some performance limitations. This paper analyses the penalty of using Java and proposes some mechanisms to improve the performance of cryptographic
implementations in Java.Publicad
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