The analysis of assumptions in model bases using metagraphs

Article Abstract:

The role of assumptions in decision making models based on metagraphs was investigated. An analytical approach was proposed to represent assumptions about the validity of decision model bases, examine assumptions that are necessary for solving a particular problem using a given decision model and determine how the problem specification or the context can be modified to make that problem solvable. Results showed that metagraphs can be extended to include assumption use and representation. Metagraphs, for instance, can be drawn pictorially for problems involving small model bases. Thus, metagraph-based model bases can actively support important model management functions such as model evaluation and selection. It was also found that projections and contexts of decision model bases consisting of assumptions are commutative.

Management Theory & Techniques, Information Systems & Theory, Management, Information systems, Graph theory, Hypothesis, Hypothesis (Logic)

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Operational control of the transportation of hazardous materials: an assessment of alternative decision models

Article Abstract:

Dispatchers of hazardous material transports can keep track of vehicular movement on a transportation network in real time with the use of tracking systems relying on sophisticated communications and computing technology. This technology can help dispatchers map the regions surrounding the transportation network in case of unexpected events, and plan safe and cost-efficient alternative routes for the hazardous material transports scheduled to pass through the affected regions. Four decision models for rerouting such vehicles have been tested in an experimental setting. The first two models enable the dispatcher to make decisions by presenting alternative routes, while the other two supports the dispatcher in assessing the effects of the events on transportation safety and costs.

Usage, Transportation, Hazardous substances

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