Title of Dissertation: Individual Blade Control for Vibration Reduction of a Helicopter with Dissimilar Blades Beatrice Roget, Doctor of Philosophy, 2004 Dissertation directed by: Professor Inderjit Chopra Department of Aerospace Engineering A control method is proposed to reduce vibrations in helicopters using active trailing-edge flaps on the rotor blades. The novelty of the method is that ea...

Addressing concerns about future food supply and climate change requires management practices that maximize productivity per unit of arable land while reducing negative environmental impact. On-farm data were evaluated to assess energy balance and greenhouse gas (GHG) emissions of irrigated maize in Nebraska that received large nitrogen (N) fertilizer (183 kg of N · ha(-1)) and irrigation water...

This paper explores the association between rural electrification and agricultural output at macro level using panel data on 43 Sub-Saharan African countries from 1990 to 2016. We employed Fully Modified Ordinary Least Squares (FMOLS) with time trend country fixed effect in our econometrics estimation address potential serial correlation. Our study investigates following; i) output, measured as...

In recent years, computational biologists have shown through simulation that small neural networks with fixed connectivity are capable of producing multiple output rhythms in response to transient inputs. It is believed that such networks may play a key role in certain biological behaviors such as dynamic gait control. In this paper, we present a novel method for designing continuous-time recur...

The relative contributions of bottom-up versus top-down sensory inputs to auditory learning are not well established. In our experiment, listeners were instructed to perform either a frequency discrimination (FD) task ("FD-train group") or an intensity discrimination (ID) task ("ID-train group") during training on a set of physically identical tones that were impossible to discriminate consiste...

Satisfiability Modulo Theories (SMT) is essential for many applications in computer-aided verification. A recent SMT solving approach based on stochastic local search for the theory of quantifier-free fixed-size bit-vectors proved to be quite effective on hard satisfiable instances, particularly in the context of symbolic execution. However, it still relies on brute-force randomization and rest...

A Look-Up Table (LUT) ring consists of memories, programmable interconnections and a control circuit. It sequentially emulates an LUT cascade representing a multipleoutput logic function. In this paper, we consider the realization of multi-output functions with LUT rings using large memories. In contrast to previous approaches where the number of inputs to each LUT cell is fixed, we allow the n...

Tuft dendrites are the main target for feedback inputs innervating neocortical layer 5 pyramidal neurons, but their properties remain obscure. We report the existence of N-methyl-D-aspartate (NMDA) spikes in the fine distal tuft dendrites that otherwise did not support the initiation of calcium spikes. Both direct measurements and computer simulations showed that NMDA spikes are the dominant me...

Legibility of head-fixed displays in some motion environments is partially dependent upon visual suppression of the vestibuloocular reflex (VOR). This study investigates the effects of differing relationships between peripheral background movement and whole-body motion on the VOR and on visual performance. The purpose of the study is to explore factors in motion environments that influence perf...

This paper considers the problem of generating optimal guidance trajectories for high-speed waypoint transitions by an autonomous helicopter. Given a set of waypoints and a desired order for passing through them, an optimal control problem is solved using collocation for every pair of consecutive waypoints. The linear hover model of the Yamaha R-50 helicopter is employed in the optimal control ...