The system analyzes the data and recognizes if a dangerous situation exists such as the sudden appearance of road construction sites, traffic back-ups and warnings of objects on the road or inclement weather. Drivers are warned of the precise location of the danger through warning lights integrated in the reflector posts and directly via car-to-x communication. Fraunhofer Institute for Embedded...

We explore a hypothesis about the take-off in inflation that occurred in the early 1970s. According to the expectations trap hypothesis, the Fed was pushed into producing the high inflation out of a fear of violating the public's inflation expectations. We compare this hypothesis with the Phillips curve hypothesis, according to which the Fed produced the high inflation as an unfortunate by-prod...

The 2013 UPS George D. Smith Prize was awarded to the Naval Postgraduate School’s (NPS) Operations Research (OR) department for “effective and innovative preparation of students to be good practitioners of operations research, management science, or analytics.” In the spirit of the prize, this paper shares details about our degree program. The program is closely linked to its military sponsor, ...

The design process for a fuel-cell-based inverter system for domestic use is discussed. The peculiar characteristics of the fuel cell stack energy source require the use of a battery for buffering. The fuel cell characteristics and the battery requirements for this application are discussed. A large number of different possible solutions are examined. The proposed solution uses an active filter...

Uninterruptible power supply (UPS) systems are required for supplying sinusoidal output voltage for linear and nonlinear loads. They must be highly reliable and fast in dynamic response. Many control strategies have been applied to UPS inverters. The basic objectives of UPS control systems are tracking ability and robustness. Generally, the tasks of output voltage control for UPS inverters are ...

Power electronics based zonal dc power distribution systems are being considered for future Navy ships. The stability of dc power electronics based power distribution systems, and in particular dc systems, is a significant design consideration because of the potential for negative impedance induced instabilities. In this paper, methodologies for analyzing the stability of these systems are revi...

This paper presents the proposal and implementation of a power management architecture for local area network environments. Our main goal is to contribute to more efficient use of electricity, reducing energy waste by facilitating the configuration of power policies and providing a means to automate their execution. The architecture we propose is based on the SNMP (Simple Network Management Pro...

When energy prices fluctuate, small scale storage, such as provided by electric vehicles or uninterruptible power supplies, allows users to reduce their overall costs by buying in price troughs. However, if future prices are rising, a user may be inclined to store energy long-term. By analysing the structural properties of the charging schedule for energy storage systems,this paper demonstrates...