Contemporary computing systems, especially large-scale systems such as Grids promise ultra-fast ubiquitous utility computing, always available at the flip of a switch. A major unresolved issue is the organization and efficient usage of such infrastructure in a commercial context where several entities compete for shared resources. This has long been resolved for conventional utility resources s...

Trust and reputation models play an important role in enabling trusted computations over large-scale distributed Grids. Many models have been recently proposed and implemented within trust management systems. Nevertheless, the existing approaches usually assess performance of models in terms of resource management while less attention is paid to the analysis of security threat scenarios for suc...

Abstract We present an operation management controller for low voltage (LV) grids that coordinates a multitude of distributed energy resources (DER) in real time to maximize the utilization renewable production. It utilizes LTE radio network connects DERs distribution system operator. In our approach, utility functions are assigned DERs, and maximization is formulated as optimization problem. T...

Currently several production Grids offer their resources for academic communities. Access to these Grids is free but restricted to academic users. As so, the Grids offer only basic quality of service guarantees and minimal user support. This incorporates Grid portals without workflow editing and execution capabilities, brokering with no QoS and SLA management, security solutions without privacy...

Grid technologies provide the basis for creating a service-oriented paradigm that enables a new way of service provisioning based on utility computing models. For typical utility computing-based services, users are charged for consuming services on the basis of their usage and QoS level required. Therefore, while scheduling workflows on utility Grids, service price must be considered while opti...

A selection of these reports is available in PostScript form at the Faculty's anonymous ftp-Abstract In this paper some discretization issues that arise in nite volume computations of turbulent ows in arbitrarily shaped domains are presented. Staggered grids are employed. Turbulence is modeled by the standard k-" model. Dis-cretizations are discussed of a general transport equation which are ex...

The shift of grids from providing compute power on sharing basis to commercial purposes, even though has not fully unfolded and still mostly limited to research, has led to various technical advancements paved a way to make utility grids a reality. Those advancements favor the application of market-based mechanisms for Grid systems by providing various pre-requisites on technical and economic s...

Following Alessandro Volta’s invention of the electrical battery in 1800, Thomas Edison paved the way for electricity’s widespread use by inventing the electric bulb. Figure 1 shows Volta demonstrating the battery for Napoleon I in 1801 at the French National Institute, Paris. Whether or not Volta envisioned it, his invention evolved into a worldwide electrical power grid that provides dependab...