Recently, as a demand for connecting Supervisory Control and Data Acquisition (SCADA) systems to open networks increases, the study of SCADA system security becomes an issue. Many researchers have proposed key management schemes for SCADA systems. However, previous studies lack the proper considerations for availability. In this paper, we build up cryptographic security requirements for robust ...

An effective warranty servicing strategy should be made considering both warranty cost and product availability. Based on the two-dimensional free repair warranty, a strategy combining the imperfect preventive maintenance and minimal repair is proposed where the imperfect preventive maintenances are implemented in a special subregion of the warranty and all other failures are repaired minimally...

OBJECTIVE to determine whether the use of a helicopter ambulance unit enabled an ambulance service to deliver acutely traumatized patients to hospital more quickly. DESIGN retrospectively collected ambulance service and hospital records data analysed longitudinally. SETTINGS The ambulance service and the major casualty department in Cornwall. INTERVENTION the provision of a helicopter amb...

This paper deals with the performance analysis of the screening unit in a paper plant using Genetic Algorithm. The screening unit in the paper plant has four main subsystems. These subsystems are arranged in series and parallel configurations. Considering exponential distribution for the probable failures and repairs, the mathematical formulation of the problem is done by Markov birth-death pro...

INTRODUCTION The recent arrivals of fast networks, such as Myrinet, asynchronous transfer mode (ATM) coupled with powerful personal computers and workstations, has allowed for cost effective high-performance and high-availability clusters to be built from commodity parts. Additionally, the new cluster platform offers enough raw hardware performance to allow execution of applications such as par...