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Blockage of communication links due to environmental obstructions and the resulting on/off channel behavior present challenges for providing reliable communication in mobile wireless networks. Traditional reliability techniques such as forward error correction and automatic repeat request (ARQ) are not designed to operate at the timescales typically observed in blockage channels. This work presents...
The world wide web and its continuous growth remains among the trending topics in daily conversations. Social networks are a convenient way for people to share information and communicate with one another whether it is for the purpose of exchanging information or seeking social interaction from colleagues or coworkers. It seems that many online users are turning to social networking environments for...
Potential NASA optical missions such as the Space Interferometer Mission require actuators for precision positioning to accuracies of the order of nanometers. Commercially available multilayer piezoelectric stack actuators are being considered for driving these precision mirror positioning mechanisms. These mechanisms have potential mission operational requirements that exceed 5 years for one mission...
The Radiation Belt Storm Probes (RBSP) mission is being designed to help us understand the Sun's influence on Earth and near-Earth space by studying the Earth's radiation belts on various scales of space and time. NASA has designated RBSP as a risk class C mission (Explanation of risk classifications for NASA payloads, can be found in NPR 8705.4, Appendix A). As a result, the pair of spacecraft (including...
Multiphase electric drives have been recently proposed for applications where the highest overall system reliability, combined with a reduction in the total power per phase, are required. Strategies like Field Oriented Control (FOC) and Direct Torque Control (DTC) have been traditionally used in these high performance applications. In this paper, a Predictive Torque Control (PTC) method is introduced...
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