Hierarchical infrastructure network representation methods for risk-based decision-making

Evaluation of the robustness of critical infrastructures by Hierarchical Graph representation, clustering and Monte Carlo simulation

“…In the Hierarchical Graph representation, the adjective "hierarchical" does not imply a "decomposition of the system into different levels of details", as in other hierarchical models (e.g., Goal Tree Success Tree -Dynamic Master Logic Diagram [Hu and Modarres, 2000] and hierarchical clustering [Gómez et al, 2013]), but it simply means that the graph of interconnected CIs is structured in hierarchical levels. In extreme synthesis, the representation is built as follows: at the bottom of the graph, the inputs (i.e., the arcs through which the product is injected into the networks) are represented; at the top, the goals (i.e., the demand nodes that have to be satisfied) are reported; in the middle, all the other arcs (transmission and/or load arcs) that provide product to the demand nodes are organized in hierarchical levels.…”

“…In risk analysis, common representation techniques are hierarchical trees that are possibly used to identify i) the initiating causes of a pre-specified, undesired event or ii) the accident sequences that can generate from a single initiating event through the development of structured logic trees (i.e., fault and event trees, respectively) [Zio, 2007]. Recently, also networks have been represented by hierarchical modeling [Gómez et al, 2013;Buriticá Cortés et al, 2014].…”

Risk assessment and management of civil infrastructure networks: a systems approach

“…Aiming to provide a model for a highly complex system, it is proposed that networks are partitioned recursively based on pertinent criteria (Gómez et al, 2011a). Each level of recursion (i.e., each different partitioning of the network) denotes a level of abstraction.…”

Hierarchical decision making for flood risk reduction

“…Hierarchical decision making has been researched in several other topical areas, such as structural engineering (Vadde et al 1994) , mechanical engineering (Kuppuraju et al 1985) and infrastructure management (Gómez et al 2013). It is noted, that in these papers hierarchy has a different connotation as it refers to a system and hierarchically subordinated subsystems, i.e.…”