In a virtualized data center, server maintenance is a common but still critical operation. A prerequisite is indeed to relocate elsewhere the Virtual Machines (VMs) running on the production servers to prepare them for the maintenance. When the maintenance focuses several servers, this may lead to a costly relocation of several VMs so the migration plan must be chose wisely. This however implie...

This paper describes how the MTR Corporation of Hong Kong made use of Artificial Intelligence (AI) and Web 2.0 technology to computerize and streamline daily maintenance scheduling. The application is called the Engineering Works and Traffic Information Management System (ETMS), an intelligent workflow system for maintenance scheduling. ETMS oversees over a thousand workers for railway maintena...

Wind farms have gained wide attention due to unlimited resources and clean energy. Considering that wind turbine systems are always in harsh conditions, subsystem failures could reduce the reliability of systems. At present, maintenance behaviors for various (e.g., corrective maintenance, preventive maintenance) when is reduced below threshold. cost downtime, it impossible repair each component...

The initial stages of spinodal decomposition were studied by subjecting a critical blend of model polyolefins to a pressure quench and monitoring the evolution by time-resolved small angle neutron scattering. Contrary to the predictions of the widely accepted Cahn-Hilliard-Cook theory, we demonstrate that coarsening of the phase-separated structure begins immediately after the quench and occurs...

This paper presents a theoretical model for studying the dynamics of ordering in alloys which exhibit modulated phases. The model is different from the standard time-dependent Ginzburg-Landau description of the evolution of a non-conserved order parameter and resembles the Swift-Hohenberg model. The early-stage growth kinetics is analyzed and compared to the Cahn-Hilliard theory of continuous o...

We establish existence and non-existence results for entire solutions to the fractional Allen-Cahn equation in R, which vanish on helicoids and are invariant under screw-motion. In addition, we prove that helicoids are surfaces with vanishing nonlocal mean curvature.

We study the effect of a higher-order nonlinearity in the standard Kuramoto-Sivashinsky equation: partial differentialxG(Hx). We find that the stability of steady states depends on dv/dq , the derivative of the interface velocity on the wave vector q of the steady state. If the standard nonlinearity vanishes, coarsening is possible, in principle, only if G is an odd function of Hx. In this case...

In this review, we consider transformations of axial symmetry in metazoan evolution and development, the genetic basis, phenotypic expressions different body plans. addition to main types plans, such as rotation (radial symmetry), reflection (mirror glide translation (metamerism), many biological objects show scale (fractal) well some symmetry-type combinations. Some mechanisms pattern establis...

0377-2217/$ see front matter 2008 Elsevier B.V. A doi:10.1016/j.ejor.2008.03.001 * Corresponding author. Tel.: +1 519 888 4567x339 E-mail addresses: [email protected] (L. Fu), vkim@ This paper introduces a real-time optimization model that can be used by maintenance managers to develop and evaluate alternative resources allocation plans for winter road maintenance operations. The model takes int...