David A. Schoenwald

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—This paper describes how decentralized control theory can be used to analyze the control of multiple cooperative robotic vehicles. Models of cooperation are discussed and related to the input/output reachability, structural observability, and controllability of the entire system. Whereas decentralized control research in the past has concentrated on using(More)
Photovoltaic (PV) systems have caused residential and commercial building fires when an electrical arc fault initiates in the conduction path. Article 690.11 in the United States 2011 National Electrical Code requires new photovoltaic systems on or penetrating a building to include a listed arc fault protection device to prevent additional fires. In(More)
A utonomous unmanned vehicles (AUVs) have generated much interest in recent years due to their great promise for performing repetitive, dangerous, or information gathering tasks in hazardous or remote environments. The diversity of environments in which these vehicles must operate (space, air, water, ground, and combinations thereof) results in a wide(More)
Approved for public release; further dissemination unlimited. of the United States Government. Neither the United States Government, nor any agency thereof, nor any of their employees, nor any of their contractors, subcontractors, or their employees, make any warranty, express or implied, or assume any legal liability or responsibility for the accuracy,(More)
Researchers at Sandia National Laboratories have developed a next-generation agent-based economic 'laboratory' (N-ABLE) for analyzing the economic factors, feedbacks, and downstream effects of infrastructure interdependencies. N-ABLE is a simulation environment in which hundreds of thousands of individual economic actors simulate real-world manufacturing(More)
A system dynamics model is developed to describe how insurgency groups pursue funding for their operations and the choices they make in how they allocate these funds to maintain their operations and advance their causes. The model illustrates that the insurgent groups, under survival pressure, will seek necessary resources to continue their operations by(More)
—Traditional grid models for large-scale simulations assume linear and quasi-static behavior allowing very simple models of the systems. In this paper, a scalable electric circuit simulation capability is presented that can capture a significantly higher degree of fidelity including transient dynamic behavior of the grid as well as allowing scaling to a(More)
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