TY - JOUR T1 - Managing dynamic enterprise and urgent workloads on clouds using layered queuing and historical performance models JF - Simulation Modelling Practice and Theory Y1 - 2011 A1 - David A. Bacigalupo A1 - van Hemert, Jano I. A1 - Xiaoyu Chen A1 - Asif Usmani A1 - Adam P. Chester A1 - Ligang He A1 - Donna N. Dillenberger A1 - Gary B. Wills A1 - Lester Gilbert A1 - Stephen A. Jarvis KW - e-Science AB - The automatic allocation of enterprise workload to resources can be enhanced by being able to make what–if response time predictions whilst different allocations are being considered. We experimentally investigate an historical and a layered queuing performance model and show how they can provide a good level of support for a dynamic-urgent cloud environment. Using this we define, implement and experimentally investigate the effectiveness of a prediction-based cloud workload and resource management algorithm. Based on these experimental analyses we: (i) comparatively evaluate the layered queuing and historical techniques; (ii) evaluate the effectiveness of the management algorithm in different operating scenarios; and (iii) provide guidance on using prediction-based workload and resource management. VL - 19 ER - TY - CONF T1 - An Architecture for an Integrated Fire Emergency Response System for the Built Environment T2 - 9th Symposium of the International Association for Fire Safety Science (IAFSS) Y1 - 2008 A1 - Rochan Upadhyay A1 - Galvin Pringle A1 - George Beckett A1 - Stephen Potter A1 - Liangxiu Han A1 - Stephen Welch A1 - Asif Usmani A1 - Jose Torero KW - emergency response system KW - FireGrid KW - system architecture KW - technology integration AB - FireGrid is a modern concept that aims to leverage a number of modern technologies to aid fire emergency response. In this paper we provide a brief introduction to the FireGrid project. A number of different technologies such as wireless sensor networks, grid-enabled High Performance Computing (HPC) implementation of fire models, and artificial intelligence tools need to be integrated to build up a modern fire emergency response system. We propose a system architecture that provides the framework for integration of the various technologies. We describe the components of the generic FireGrid system architecture in detail. Finally we present a small-scale demonstration experiment which has been completed to highlight the concept and application of the FireGrid system to an actual fire. Although our proposed system architecture provides a versatile framework for integration, a number of new and interesting research problems need to be solved before actual deployment of the system. We outline some of the challenges involved which require significant interdisciplinary collaborations. JF - 9th Symposium of the International Association for Fire Safety Science (IAFSS) PB - IAFSS CY - Karlsruhe, GERMANY ER -