Failures in critical infrastructures can cause major damage to society, and thus there is a need for a common approach to cross-sector risk analyses. This paper presents such an approach, which includes an extended preliminary hazard analysis and detailed risk analysis of electricity supply, carried out in a case study. The risk analysis approach constitutes an important basis for analyzing int...

The occurrence of a probabilistic common-cause failure (PCCF) in a system results in failures of multiple system components with different probabilities. A PCCF can be caused by external shocks or propagated failures originating from some components within the system. This paper proposes an explicit method and an implicit method to analyze the reliability of systems subject to internal or exter...

Most applications of model-based diagnosis rely on the assumption that components fail independently. However, dependent failures are quite common in some domains. In such domains, the failure of one component may cause the failure of other components. Hence, multiple faults are much more likely, and the minimal diagnoses may not contain all components which have failed. In this work we propose...

This paper presents a mathematical model for performing availability and reliability analysis of a parallel repairable system consisting of n identical components with degradation facility and common-cause failures. In addition, system repair time is assumed to be arbitrarily distributed. Markov and supplementary variable techniques are used to develop equations for the model. As an illustratio...

DEFINITION Just like any other software system, a data stream management system (DSMS) can experience failures of its different components. Failures are especially common in distributed DSMSs, where query operators are spread across multiple processing nodes, i.e., independent processes typically running on different physical machines in a local-area network (LAN) or in a wide-area network (WAN...

Electrical Submersible Pumps (ESPs) are one of the most widely used artificial lift methods in petroleum industry. However, ESP failures unanticipated and common occurrences with significant financial impacts for operators. Analysis performance essential its design optimization. This paper presents a statistical approach diagnosing evaluating root causes failures. The analysis is based on field...

Dependency analysis of critical infrastructures is a computationally intensive problem when dealing with large-scale, cross-sectoral, cascading and common-cause failures. The problem intensifies when attempting a dynamic, time-based dependency analysis. This paper extends a previous graph-based risk analysis methodology to dynamically assess the evolution of cascading failures over time. Variou...

BACKGROUND/AIMS To present the causes of acute liver failure in Turkey. MATERIALS AND METHODS [corrected] International and national medical research databanks were searched for publications related to acute liver failure and originating from Turkey. Patients in the databank of acute liver failure of our center were also added to this literature search. Patients were evaluated for age, gender...