what-when-how
In Depth Tutorials and Information
gaseous nitrogen, which prevents any reaction or ignition from the air. Actuators
are used to systematically control the amount of input and output of the pentane
liquid and the nitrogen gas, as well as control the output of pressure from the tank.
A vent hole, safety valve, and retention pool are present for sustaining a safe amount
of liquid in the tank and also for balancing the amount of pressure buildup inside
the tank.
A global risk analysis was performed on the storage tank scenario previously
described. he irst step of achieving the global risk analysis was to perform a tech-
nical analysis that would identify the contributing factors that make up the techni-
cal layer of the model. Next, the human and organizational factors were identified
with respect to decision-making support. Lastly, all risk reduction barriers were
identified as well as the resources they influence. All these variables were then
incorporated to construct the Bayesian network model. his constructed model
served as the basis for determining the probabilistic occurrence of the critical event
in the month of August.
9.5 DynamicNetworks:ModelingChange
inRiskyEnvironments[16]
he research in [16] presents an interim report on the study of the transportation
system in the Pittsburgh Metropolitan Region in reaction to a range of extreme
events on the existing infrastructure. Certain aspects of this research are ongoing
but the three principal objectives are as follows:
◾
To identify the metrics associated with the operation of a regional transporta-
tion system for both the technical and organizational networks
◾
To construct a model for determining patterns of adaptive response through
simulation of threats to the system under different conditions of risk and
resilience
◾
To provide a model as a means of supporting decision making at the manage-
ment level to improve efficiency and effectiveness handling risk to transporta-
tion systems
As stated, the focus of this research is to develop a model that accurately repre-
sents a sociotechnical system for disaster response. Typically, social and technical
infrastructures have been modeled independently using an interconnected system
of nodes and links representing the relationships or interactions between different
entities. Relative to the goals of this research, the relationships and interactions
between the social and technical infrastructures are substantially important for
assessing the fragility or performance of a transportation system within a metro-
politan region under threat.
