The age of Internet of Things (IoT) has brought in new challenges specifically in areas such as security. The evolution of classic power grids to smart grids is a prime example of how everything is now being connected to the Internet. With the power grid becoming smart, the information and communication systems supporting it is subject to both classical and emerging cyber-attacks. The article i...

Morse decomposition has been shown a reliable way to compute and represent vector field topology. Its computation first converts the original vector field into a directed graph representation, so that flow recurrent dynamics (i.e., Morse sets) can be identified as some strongly connected components of the graph. In this paper, we present a framework that enables the user to efficiently compute ...

We present a computational module for interactively visualizing large scale D un structured meshes Scientists and engineers routinely solve large scale computational boundary value problems on unstructured grids These grids typically range from several hundred thousand elements to millions of elements With this ability to solve such large scale problems comes the challenge of viewing the D nite...

Thanks to policy incentives in a growing number of jurisdictions, wind and photovoltaics have become the two fastest growing energy sources in the world. They are now dominated by global corporations with the resources to support their installations with the reliability demanded by the electric utility industry. To date, most of this growth has been targeted at continent-scale electric grids, w...

The adoption of market-based principles in resource management systems for computational infrastructures such as grids and clusters allows for matching demand and supply for resources in a utility maximizing manner. As such, they offer a promise of producing more efficient resource allocations, compared to traditional system-centric approaches that do not allow consumers and providers to expres...

Smart grids enable customers and utility providers to gain a better understanding of energy consumption and production, by adding a layer of digital data collection and analysis on existing electricity grids. As digital infrastructures they have distinct characteristics from earlier ‘pipeline’ infrastructures in that they can generate significant network effects that could lead to new opportuni...

Energy storage systems (ESS) have recently become an indispensable solution to many operational issues related to the integration of distributed generation (DG) technologies in electricity grids. Most of the applications are in the form of power quality mitigation and management of the energies between DG and electricity grids. This paper presents a review of the present status of worldwide app...

The notion of a part of phase space containing desired (or allowed) states of a dynamical system is important in a wide range of complex systems research. It has been called the safe operating space, the viability kernel or the sunny region. In this paper we define the notion of survivability: Given a random initial condition, what is the likelihood that the transient behaviour of a determinist...

A multi-block overset grid method is presented to accurately simulate viscous flows around complex configurations. A combination of multi-block and overlapping grids is used to discretize the flow domain. A hierarchical grid system with layers of grids of varying resolution is developed to ensure inter-grid connectivity within a framework suitable for multi-grid and parallel computations. At ea...

The Laplace-Beltrami system of nonlinear, elliptic, partial differential equations has utility in the generation of computational grids on complex and highly curved geometry. Discretization of this system using the finite element method accommodates unstructured grids, but generates a large, sparse, ill-conditioned system of nonlinear discrete equations. The use of the Laplace-Beltrami approach...