Risk matrix description

At the risk of being redundant, we may state here the salient features of the TD-functional formalism. The first requirement is a variational principle, and for a time-dependent quantum description only a stationary action principle is available. With this a mapping theorem is established which turns the action functional into a functional of relevant physical quantities (which are the expectation values), and the condition of stationarity is now in terms of these variables instead of the entire density matrix. Thus the stationary property with respect to the density matrix now becomes one with respect to all the variables... 

Exactly what kind of evidence of validation is required How much evidence is sufficient to establish clear control These questions can be answered through an examination of two dimensions. Validation evidence falls into six broad issue categories further defined by two cross-matrices of risk and application. Before defining these two cross-matrix dimensions, though, a detailed description of the issue categories will be helpful. 

The proposed integrated approach is focused on 1) the gathering and analysis ofinfrastructure data(e.g. types of infrastructure, related infrastructure services, types of possible failures of the components, etc.) to evaluate the interdependences through Leontief matrix 2) the detailed description of the geographical area (e.g. extension, types and vulnerability of targets) served by the infrastructures and potentially affected by their disruptions. The main objective is to estimate the Societal Risk (Post et al. 2006) in the considered area due to the malfunctions and disruptions of critical infrastructures and a preliminary study, related to an historical urban area of a city located in northern Italy, is given as example of application (Fig. 2). 

The PHL report is generally a narrative with a summary that highlights significant risks and recommendations. It should also contain a brief project description, a discussion of the PHL methodology used including the risk assessment matrix, requirements for additional information, recommendations for follow-on studies or analyses, and the PHL worksheets. 

Hazard information is converted to risk information by evaluating the severity of potential accidents associated with the hazard and by evaluating the probability that the hazard could produce an accident. It is done by developing a matrix with severity on one axis and probability on the other, with a numeric code used to represent the risk associated with each hazard. This risk assessment code (RAC) is used to prioritize hazards and determine their acceptability. Hazard severity may be expressed quantitatively (for example, dollar loss or number of injuries), qualitatively (verbal descriptions), or as a combination (Table 11-1). 

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