Now showing items 1-20 of 96

    • Usability Evaluation in Virtual Environments: Classification and Comparison of Methods 

      Bowman, Doug A.; Gabbard, Joseph L.; Hix, Deborah (Department of Computer Science, Virginia Polytechnic Institute & State University, 2001), TR-01-17
      Virtual environments (VEs) are a relatively new type of human-computer interface in which users perceive and act in a three-dimensional world. The designers of such systems cannot rely solely on design guidelines for ...
    • A Survey of Usability Evaluation in Virtual Environments: Classification and Comparison of Methods 

      Bowman, Doug A.; Gabbard, Joseph L.; Hix, Deborah (MIT Press, 2002-08-01)
      Virtual environments (VEs) are a relatively new type of human-computer interface in which users perceive and act in a three-dimensional world. The designers of such systems cannot rely solely on design guidelines for ...
    • Intersection Decision Support: Evaluation of a Violation Warning System to Mitigate Straight Crossing Path Collisions 

      Neale, Vicki L.; Perez, Miguel A.; Doerzaph, Zachary R. (Zachary Richard); Lee, Suzanne E.; Stone, Scott; Dingus, Thomas A. (Virginia Center for Transportation Innovation and Research, 2006-04)
      This project entailed the design, development, testing, and evaluation of intersection decision support (IDS) systems to address straight crossing path (SCP) intersection crashes. This type of intersection crash is responsible ...
    • Dynamics and Control of Underwater Gliders I: Steady Motions 

      Mahmoudian, N.; Geisbert, J.; Woolsey, C. (Virginia Center for Autonomous Systems, 2007)
      This paper describes analysis of steady motions for underwater gliders, a type of highly efficient underwater vehicle which uses gravity for propulsion. Underwater gliders are winged underwater vehicles which locomote by ...
    • Sensor Error Model for a Uniform Linear Array 

      Gadre, Aditya; Roan, Michael J.; Stilwell, Daniel J. (Virginia Center for Autonomous Systems, 2008)
      We derive a measurement error model for a uniform linear array whose output is the bearing to a single narrowband acoustic source. The measurement error depends on various array as well as environmental parameters, which ...
    • Effectiveness and Acceptance of Adaptive Intelligent Speed Adaptation Systems 

      Arhin, Stephen; Eskandarian, Azim; Blum, Jeremy; Delaigue, Pierre; Soudbakhsh, Damoon (The National Academies of Sciences, Engineering, and Medicine, 2008)
      Intelligent speed adaptation (ISA) systems face significant consumer acceptance hurdles that limit the likelihood of widespread adoption, particularly in the United States. However, if these systems are designed as speed ...
    • Optimal Control of an Undersea Glider in a Symmetric Pull-up 

      Kraus, R.; Cliff, Eugene M.; Woolsey, C.; Luby, J. (Virginia Center for Autonomous Systems, 2008)
      An undersea glider is a winged autonomous undersea vehicle which modulates its buoyancy to rise or sink and moves its center of mass to control pitch and roll attitude. By properly phasing buoyancy and pitch control, an ...
    • Nonlinear Estimation with State-Dependent Gaussian Observation Noise 

      Spinello, D.; Stilwell, Daniel J. (Virginia Center for Autonomous Systems, 2008)
      We consider the problem of estimating the state of a system when measurement noise is a function of the system's state. We propose generalizations of the iterated extended Kalman filter and of the extended Kalman filter ...
    • Assessment of a Drowsy Driver Warning System for Heavy Vehicle Drivers: Final Report 

      Olson, Rebecca L. (Rebecca Lynn); Morgan, Justin F.; Hanowski, Richard J.; Daily, B.; Zimmermann, R. P.; Blanco, Myra; Bocanegra, Joseph L.; Fitch, Gregory M.; Flintsch, Alejandra Medina (United States. National Highway Traffic Safety Administration, 2008)
      Drowsiness has a globally negative impact on performance, slowing reaction time, decreasing situational awareness, and impairing judgment. A field operational test of an early prototype Drowsy Driver Warning System was ...
    • The Drowsy Driver Warning System Field Operational Test: Data Collection Methods: Final Report 

      Hanowski, Richard J.; Blanco, Myra; Nakata, A.; Hickman, Jeffrey S.; Schaudt, William A.; Fumero, M. C.; Olson, Rebecca L. (Rebecca Lynn); Jermeland, J.; Greening, M.; Holbrook, G. T.; Knipling, Ronald R.; Madison, P. (United States. National Highway Traffic Safety Administration, 2008-09)
      A Drowsy Driver Warning System (DDWS) detects physiological and/or performance indications of driver drowsiness and provides feedback to drivers regarding their state. The primary function of a DDWS is to provide information ...
    • Review of user interface devices for ambient assisted living smart homes for older people 

      O'Mullane, B.A.; Knapp, R. Benjamin; Bond, R. (International Society for Gerontechnology, 2010)
      Smart homes generally focus on issues to do with security, health, energy savings and entertainment, issues which grow in importance as we age. The sensors, actuators and entertainment devices required to build such a ...
    • Control-Oriented Planar Motion Modeling of Unmanned Surface Vehicles 

      Sonnenburg, C.; Gadre, Aditya; Horner, D.; Krageland, S.; Marcus, A.; Stilwell, Daniel J.; Woolsey, C. (Virginia Center for Autonomous Systems, 2010)
      This technical report describes a comparison of experimentally identified dynamic models for the planar motion of an unmanned surface vehicle (USV). The objective is to determine a model which is (1) sufficiently rich to ...
    • Dynamics & Control of Underwater Gliders II: Motion Planning and Control 

      Mahmoudian, N.; Woolsey, C. (Virginia Center for Autonomous Systems, 2010)
      This paper describes an underwater glider motion control system intended to enhance locomotive efficiency by reducing the energy expended by vehicle guidance and control. In previous work, the authors derived an approximate ...
    • Synchronization challenges in media access coordination for vehicular ad hoc networks 

      Blum, Jeremy; Natarajan, Rajesh; Eskandarian, Azim (Wiley, 2010-01-18)
      Vehicular ad hoc networks (VANETs) can support a wide range of future cooperative safety and efficiency applications. However, the node density and high demand for wireless media in these networks can lead to the Timeslot ...
    • Human Performance Evaluation of Light Vehicle Brake Assist Systems 

      Fitch, Gregory M.; Blanco, Myra; Morgan, Justin F.; Rice, Jeanne C.; Wharton, Amy E.; Wierwille, Walter W.; Hanowski, Richard J. (United States. National Highway Traffic Safety Administration, 2010-04)
      The Brake Assist System (BAS) is a safety feature that supplements drivers' inadequate braking force during panic braking maneuvers upon the detection of a rapid brake pedal application. This report presents an evaluation ...
    • Vehicle Dynamics in Currents 

      Woolsey, C. (Virginia Center for Autonomous Systems, 2011)
      Vehicles operating in non-uniform flow fields are subject to forces and moments that are not captured by kinematic motion models. These effects are even greater when the mass of the displaced fluid is commensurate with the ...
    • A collaboration workflow from sound-based composition to performance of electroacoustic music using «Pure Data» as a framework. 

      Tsoukalas, Kyriakos (Bauhaus Universitat Weimer, 2011-08)
      This paper describes a workflow for composers, engineers and performers to collaborate, using Pure Data (PD) as a framework, towards the design of electroacoustic musical instruments intended for live performances of ...
    • Evaluation of Resiliency of Transportation Networks After Disasters 

      Freckleton, Derek; Heaslip, Kevin Patrick; Louisell, William; Collura, John (The National Academies of Sciences, Engineering, and Medicine, 2012)
      The resiliency of infrastructure, particularly as related to transportation networks, is essential to any society. This resiliency is especially vital in the aftermath of disasters. Recent events around the globe, including ...
    • Sensing and Autonomy for Riverine Vessels 

      Stilwell, Daniel J.; Woolsey, Craig A. (Defense Technical Information Center, 2012)
      The principal goal of this project is to develop the technology and algorithms that will enable an unmanned surface vehicle (USV) to operate fast and autonomously in unknown riverine environments, including tropical rivers. ...
    • AERIS : Eco-Vehicle Speed Control at Signalized Intersections Using I2V Communication 

      Rakha, Hesham A.; Kamalanathsharma, Raj K.; Ahn, Kyoungho (United States. Joint Program Office for Intelligent Transportation Systems, 2012-06)
      This report concentrates on a velocity advisory tool, or decision support system, for vehicles approaching an intersection using communication capabilities between the infrastructure and vehicles. The system uses available ...