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Journal ArticleDOI: 10.1080/23789689.2019.1710072

Resilience improvement of a critical infrastructure via optimal replacement and reordering of critical components

04 Mar 2021-Vol. 6, pp 73-93
Abstract: One of the most important obstacles in improving the resilience of critical infrastructures is the timely replacement of critical components. However, the shortage of spare parts often keeps practi...

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6 results found

Journal ArticleDOI: 10.1016/J.CIE.2020.106791
Abstract: Reliability modeling and optimization of warm standby systems have attracted considerable research attentions in the past decade due to their wide use in diverse critical applications. The existing works have mostly assumed that the activation of a standby element is triggered by the failure of the online operating element. This paper advances the state of the art by modeling a new type of warm standby systems subject to preventive replacements (PR) and element reactivation during its uncertain mission time. According to pre-determined PR schedule and element activation sequence, the online element is replaced with a standby element before its failure, and any element may be activated or reactivated multiple times during the mission. The mission succeeds if none of the activated elements fails before (i.e., while in the standby mode) or during its operation. A probabilistic method is proposed to evaluate the mission success probability for the considered warm standby system. The optimal PR scheduling problem is then formulated and solved, maximizing the mission success probability. Impacts of different system model parameters on the mission success probability and on the optimization solutions are examined through two examples, including a homogeneous and a heterogeneous warm standby system.

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Topics: Standby power (59%)

9 Citations

Open accessJournal ArticleDOI: 10.1016/J.RESS.2021.107627
Abstract: Increasing urban population imposes a substantial and growing burden on the supporting infrastructure, such as electricity, water, heating, natural gas, road transportation. This paper presents a Hetero-functional graph theory (HFGT) based modeling framework for these integrated infrastructures followed by an analysis of network robustness. The supporting infrastructures along with the infrastructure repair facilities are considered. In contrast to conventional graph representations, a weighted HFGT model is used to capture the system processes and mutual dependencies among resources. To assess robustness of interdependent networks, impacts of complete/partial and random/targeted attacks are quantified. Specifically, various attack scenarios are simulated and the vulnerability of the network is evaluated. Additionally, several robustness metrics are used to provide a comprehensive evaluation of system robustness. The proposed weighted HFGT modeling and robustness assessment approach is tested using a synthetic interdependent network, comprising of an electrical power system, a water network, a district heating network, a natural gas system and a road transportation network. Results demonstrate that system robustness can be enhanced via securing system information and mitigating attack strength.

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Topics: Interdependent networks (60%), Flow network (56%), Graph (abstract data type) (52%) ... read more

7 Citations

Open accessJournal ArticleDOI: 10.3390/EN14061624
15 Mar 2021-Energies
Abstract: In terms of service provision, the electricity sector is the most important critical infrastructure sector, on the supply of which the vast majority of society and its basic vital functions depend. Extensive disruption of these supplies would have negative effects not only on basic human needs, but also on the economy and security of the state. For this reason, it is necessary to ensure permanent and comprehensive monitoring of the infrastructure elements resilience level, especially against threats with a multispectral impact on several areas of security. For this reason, the authors of the article developed the Converged Resilience Assessment (CRA) method, which enables advanced assessment of the electricity critical infrastructure elements resilience from the converged security point of view. Converged security in this case combines (converges) physical, cyber and operational security into a complementary unit. This reflects the integral determinants of resilience across related areas of security/safety. The CRA method focuses mainly on information and situation management, which integrates and correlates information (signals) from systems and sensors in order to obtain an overview of the situation and the subsequent effective management of its solution. The practical use of the proposed method is demonstrated on a selected element of the Czech Republic transmission system. The CRA method is currently embodied in a functional sample that has been piloted on several TSO elements. Further development of this method is seen mainly in fulfilling the logic of network infrastructure and reflection between elementary and intersectoral links in the context of synergistic and cascading effects in a broader context.

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2 Citations

Journal ArticleDOI: 10.1109/TLA.2021.9448550
Abstract: Electric power systems are prone to disturbances and contingencies, which can trigger cascading failures with severe consequences for society. These undesirable events could disintegrate the electrical infrastructure in areas with disconnected elements. In this article, we propose a novel procedure to restore a collapsed power grid composed of multiple islands and isolated assets. The framework developed identifies the power lines to be closed during the electrical network recovery stages. In the latter, link overload limits and generation thresholds are taken into account. Two disintegrated networks based on the well-known IEEE 57-bus test system are built to demonstrate the performance of our proposal. In summary, this methodology provides a solution to recover the power system optimally and reliably.

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Topics: Electric power system (56%), Cascading failure (55%), Electric power transmission (54%) ... read more

1 Citations

Journal ArticleDOI: 10.1080/23789689.2020.1845482
Anika M. Bell1, David N. Bristow1Institutions (1)
19 Nov 2020-
Abstract: The dependence of coastal communities on marine transportation can challenge a region’s capability to withstand large disruptions, especially in regions susceptible to large natural hazards. Here, ...

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44 results found

Journal ArticleDOI: 10.2307/2983433
Sheldon M. Ross1Institutions (1)
Abstract: The Seventh Edition of the successful Introduction to Probability Models introduces elementary probability theory and stochastic processes. This book is particularly well-suited to those applying probability theory to the study of phenomena in engineering, management science, the physical and social sciences, and operations research. Skillfully organized, Introduction to Probability Models covers all essential topics. Sheldon Ross, a talented and prolific textbook author, distinguishes this book by his effort to develop in students an intuitive, and therefore lasting, grasp of probability theory. Ross' classic and best-selling text has been carefully and substantially revised. The Seventh Edition includes many new examples and exercises, with the majority of the new exercises being of the easier type. Also, the book introduces stochastic processes, stressing applications, in an easily understood manner. There is a comprehensive introduction to the applied models of probability that stresses intuition. Both professionals, researchers, and the interested reader will agree that this is the most solid and widely used book for probability theory. Features: * Provides a detailed coverage of the Markov Chain Monte Carlo methods and Markov Chain covertimes * Gives a thorough presentation of k-record values and the surprising Ignatov's * theorem * Includes examples relating to: "Random walks to circles," "The matching rounds problem," "The best prize problem," and many more * Contains a comprehensive appendix with the answers to approximately 100 exercises from throughout the text * Accompanied by a complete instructor's solutions manual with step-by-step solutions to all exercises New to this edition: * Includes many new and easier examples and exercises * Offers new material on utilizing probabilistic method in combinatorial optimization problems * Includes new material on suspended animation reliability models * Contains new material on random algorithms and cycles of random permutations

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Topics: Applied probability (59%), Probability and statistics (57%), Imprecise probability (56%) ... read more

4,938 Citations

Open accessBook
01 Feb 1990-
Abstract: Preface.1. Introduction and Background.2. Models for Life Tests with Constant Stress.3. Graphical Data Analysis.4. Complete Data and Least Squares Analyses.5. Censored Data and Maximum Likelihood Methods.6. Test Plans.7. Competing Failure Modes and Size Effect.8. Least-Squares Comparisons for Complete Data.9. Maximum Likelihood Comparisons for Censored and Other Data.10. Models and Data Analyses for Step and Varying Stress.11. Accelerated Degradation.Appendix A. Statistical Tables.References.Index.

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Topics: Least squares (56%), Statistical model (55%)

1,770 Citations

Open accessBook
28 Feb 2006-
Abstract: For Resilience Engineering, 'failure' is the result of the adaptations necessary to cope with the complexity of the real world, rather than a breakdown or malfunction. The performance of individuals and organizations must continually adjust to current conditions and, because resources and time are finite, such adjustments are always approximate. This definitive new book explores this groundbreaking new development in safety and risk management, where 'success' is based on the ability of organizations, groups and individuals to anticipate the changing shape of risk before failures and harm occur. Featuring contributions from many of the worlds leading figures in the fields of human factors and safety, Resilience Engineering: Concepts and Precepts provides thought-provoking insights into system safety as an aggregate of its various components, subsystems, software, organizations, human behaviours, and the way in which they interact. The book provides an introduction to Resilience Engineering of systems, covering both the theoretical and practical aspects. It is written for those responsible for system safety on managerial or operational levels alike, including safety managers and engineers (line and maintenance), security experts, risk and safety consultants, human factors professionals and accident investigators.

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Topics: Resilience (network) (59%), Risk management (54%), System safety (54%)

1,600 Citations

Journal ArticleDOI: 10.1016/S0377-2217(01)00197-7
Hongzhou Wang1Institutions (1)
Abstract: In the past several decades, maintenance and replacement problems of deteriorating systems have been extensively studied in the literature. Thousands of maintenance and replacement models have been created. However, all these models can fall into some categories of maintenance policies: age replacement policy, random age replacement policy, block replacement policy, periodic preventive maintenance policy, failure limit policy, sequential preventive maintenance policy, repair cost limit policy, repair time limit policy, repair number counting policy, reference time policy, mixed age policy, preparedness maintenance policy, group maintenance policy, opportunistic maintenance policy, etc. Each kind of policy has different characteristics, advantages and disadvantages. This survey summarizes, classifies, and compares various existing maintenance policies for both single-unit and multi-unit systems. The emphasis is on single-unit systems. Relationships among different maintenance policies are also addressed.

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1,453 Citations

Journal ArticleDOI: 10.1016/J.RESS.2015.08.006
Abstract: Modeling and evaluating the resilience of systems, potentially complex and large-scale in nature, has recently raised significant interest among both practitioners and researchers This recent interest has resulted in several definitions of the concept of resilience and several approaches to measuring this concept, across several application domains As such, this paper presents a review of recent research articles related to defining and quantifying resilience in various disciplines, with a focus on engineering systems We provide a classification scheme to the approaches in the literature, focusing on qualitative and quantitative approaches and their subcategories Addressed in this review are: an extensive coverage of the literature, an exploration of current gaps and challenges, and several directions for future research

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Topics: Resilience (network) (61%), Poison control (50%)

715 Citations