Earl E. Lee

Learn More
— Modern society depends on the operations of civil infrastructure systems, such as transportation, energy, telecommunications and water. These systems have become so interconnected, one relying on another, that disruption of one may lead to disruptions in all. The approach taken in this research is to model these systems by explicitly identifying these(More)
Overview Critical infrastructure systems provide services that are essential to both the economy and well-being of nations and their citizens. As documented in a recent report to the U.S. Congress (U.S. General Accounting Office, 2001), it is of vital importance that these services not be degraded, whether by willful acts such as terrorism or by natural or(More)
Recent events have heightened our awareness of the vulnerability of civil infrastructure systems. Most of the research on this topic focused on individual systems, while more recent efforts have recognized the interconnectedness of systems. Infrastructure systems have become so highly interconnected that a failure in one system can propagate through many(More)
After a disruption in an interconnected set of systems, it is necessary to restore service. This requires the determination of the tasks that need to be un-dertaken to restore service, and then scheduling those tasks using the available resources. This paper discusses combining mathematical programming and constraint programming into multiple objective(More)
The goal of our effort is to eliminate or reduce the impact of a disruption to our critical infrastructures by protecting the quality of the services they provide. Decision technology supports those responsible for achieving this by: • Quantifying the degradation of services provided by all the systems when one or more component of any system is damaged or(More)
This paper investigates the impact of the 2001 World Trade Center attack on critical infrastructure systems in the New York City metropolitan area. Of particular interest are the physical or logical connections—also known as interdependencies—among these systems, and the results of disruptions associated with the attack on them. Prior research on(More)
The impact of extreme events is in reality the interaction among three systems; the natural environment, the human community, and the built environment-the infrastructure that supports human activities. The sustainability of our infrastructure depends upon knowledge of the natural environment – for example, the research on global warming and its impact on(More)
— Modern society depends on the operations of civil infrastructure systems, such as transportation, energy, telecommunications and water. Clearly, disruption of any of these systems would present a significant detriment to daily living. However, these systems have become so interconnected, one relying on another, that disruption of one may lead to(More)
The Geospatial Intermodal Freight Transportation (GIFT) system is an integrated model and tools to aid policy analysts and decision makers to understand the environmental, economic, and energy impacts of options for intermodal freight transportation. GIFT integrates multiple geospatial transportation networks (highway, railway, waterway) connected by(More)
Modern society relies upon the complex interaction of the civil infrastructure systems, such as transportation, power, telecommunications and water. These systems are highly dependent on each other to provide service. The reliance on any of them on power is obvious. Failures in one system can have far-reaching effects. This paper will present an overview of(More)
  • 1