The article describes the TSAR tool for system availability and availability analysis. Failure and repair model is based on Markov chain defined by states and transitions. Each state can be interpreted as working or broken. Transitions are defined by transition probabilities and transition time probability density functions. Availability and reliability analysis is based on discrete event Monte...

Nowadays, more stringent compliance regulations, businesses of all sizes are required to implement security measures to ensure their systems and data are readily available and quickly recoverable. Virtualized clustering is inherently designed for maximum data integrity and minimal recovery time in the case of site failure. Virtualization allows multiple operating system instances to run concurr...

Information Technology (IT) Security is often focused on Confidentiality, Integrity and Availability of software and data (information) contained in networked computers, servers and storage devices. In embedded industrial control or Supervisory Control and Data Acquisition (SCADA) systems the security focus must be on the protection of the availability of the system’s functions. This basic para...

Vulnerability disclosure is an area of public policy that has been subject to considerable debate, particularly between proponents of full and instant disclosure, and those of limited or no disclosure. This paper is an attempt to empirically test the impact of vulnerability information disclosure and availability of patches on attackers’ tendency to exploit vulnerabilities on one hand and on th...

This investigation deals with transient analysis of cold standby system with n units . Chapman-Kolmogorov equations are developed for repair facility with two repairmen and solved by using matrix technique. Availability and reliability factors have been obtained with probability of the system. A particular case has also been discussed.

Point availability and expected interval availability are dependability measures respectively deened by the probability that a system is in operation at a given instant and by the mean percentage of time during which a system is in operation over a nite observation period. We consider a repairable computer system and we assume as usual that the system is modeled by a nite Markov process. We pro...

Reliability and availability of power stations are extremely important in order to achieve a required level of power generation. In particular, in the hot desert climate of Kuwait, reliable power generation is extremely important because of cooling requirements at temperatures exceeding 50-centigrade degrees. In this paper, a particular power plant, named Sabiya Power Plant, which has 8 steam t...