Greg L. Zacharias

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Measurements are made of manual control performance in the closed-loop task of nulling perceived self-rotation velocity about an earth-vertical axis. Self-velocity estimation is modeled as a function of the simultaneous presentation of vestibular and peripheral visual field motion cues. Based on measured low-frequency operator behavior in three visual field(More)
This study assessed the feasibility of developing a Situation Awareness Model for Pilot-in-the-Loop Evaluation (SAMPLE) and a model-based metric for evaluating subsystems and tactics in enhancing pilot SA during the course of an air superiority mission. The study was directed at defining an overall architecture and implementing a software prototype to(More)
The human behavior modeling community has traditionally been divided into those addressing <i>individual behavior models</i>, and those addressing <i>organizational and team models</i>. And yet it is clear that these extremes do not reflect the complex reality of the mutually-constraining interactions between an individual and his/her organizational(More)
A key challenge in creating simulated human agents is to produce sufficiently realistic behavior. A critical component of such realism is the range of variations in behaviors exhibited by humans. These variations are due to a variety of factors, including varying levels of intelligence and skill, differences in cognitive and decision making styles,(More)
The development of an intelligent tutoring system for helicopter flight training is described. The Intelligent Flight Trainer (IFT) is a simulator-based system designed to assist students in developing proficiency on a suite of initial entry rotary wing maneuvers. It encapsulates instructor pilot domain knowledge in an expert system shell that provides(More)
The objective of this research is to design and demonstrate an agent-based modeling and analysis tool for evaluating General Aviation (GA) pilot situation awareness under free flight air traffic management (ATM). A computational tool is developed to assess free flight’s potential effect on GA operators, by combining an agent-based representation of the(More)
Human computational vision models that attempt to account for the dynamic perception of egomotion and relative depth typically assume a common three-stage process: first, compute the optical flow field based on the dynamically changing image; second, estimate the egomotion states based on the flow; and third, estimate the relative depth/shape based on the(More)