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  • Perceptual Adaptation In A Time Delayed Virtual Environment.

    Etd thumbnail: Perceptual Adaptation In A Time Delayed Virtual Environment.
    Type:
    Etd
    Descripción/Resumen:
    Recent advances in virtual-interface and computer technologies, including helmet-mounted displays (HMDs), three-dimensional auditory displays, haptic displays, head and eye position tracking devices, and computer-generated imaging techniques, have permitted the development of multi-sensory, interactive virtual environments. In spite of the dramatic ability of these environments to represent the perceptual world, they are limited by the problem of time delay---the delay between the input to a system and its corresponding output. For example, in the case of HMDs, time delays are present in the sampling of head position by a tracking device attached to the user's helmet and the appearance of the updated image in the HMD. Such delays cause the image to lag behind the user's head movement, thereby causing the image to be displayed in an incorrect position.
    Creador/Autor:
    Nelson, W. Todd.
    Peticionario:
    UC Libraries
    Fecha modificada:
    03/26/2018
    Fecha modificada:
    03/26/2018
    Fecha de creacion:
    1996
    Licencia:
    All rights reserved

  • Dynamics Of Gravity Waves.

    Etd thumbnail: Dynamics Of Gravity Waves.
    Type:
    Etd
    Descripción/Resumen:
    This paper consists of three parts. Part I is gravity wave growth, saturation and decay with height; part II reflection of gravity waves from critical layer using realistic background atmosphere and background wind; part III perturbation treatment of minor species' response to gravity waves. In part I by using Newtonian cooling and Rayleigh friction approximations and by considering only the average effects of turbulence on gravity waves we have derived an optical potential, with which we have studied the propagation of gravity waves and their reflections at every height level. We have found that reflections from higher level due to viscosity and heat conduction is so small that no ducting can be sustained. part II is the continuation of He Fan's work. In our work we adopt the same two parameter optical potential to model the gravity wave--critical layer interaction but we relaxed the conduction of isothermalness of the background and the linearity of the wind profile and we use the more realistic wind models, so our results should be more meaningful. We have found that the reflection coefficients of gravity waves from critical layer range from 5% to 25%, which should be measurable. In part III we develop a perturbation scheme with which it is possible to calculate the minor species response to any order in the linear gravity wave, including a secular component of the response which leads to wave-induced diffusion of minor species. Calculations to third order over a wide range of wave parameters show that the nonlinear effects can be substantial. A result is that care must be taken when analyzing data from minor species fluctuations, so that frequencies due solely to the nonlinear nature of the minor species response are not attributed to gravity waves.
    Creador/Autor:
    Li, Xuerong.
    Peticionario:
    UC Libraries
    Fecha modificada:
    03/26/2018
    Fecha modificada:
    03/26/2018
    Fecha de creacion:
    1996
    Licencia:
    All rights reserved

  • Plunder Squad

    Media thumbnail: Plunder Squad
    Type:
    Media
    Descripción/Resumen:
    A collection of images and sounds from television cop shows is interwoven with texts (selected by Scott Davenport) taken from pulp detective stories, the literary predecessor of the same genre.
    Creador/Autor:
    Davenport, Scott and Woodman, Charles
    Peticionario:
    Charles Woodman
    Fecha modificada:
    03/23/2016
    Fecha modificada:
    05/07/2019
    Fecha de creacion:
    1996
    Licencia:
    All rights reserved

  • Tunisian Victory and Anglo-American Film Propaganda in World War II

    Article thumbnail: Tunisian Victory and Anglo-American Film Propaganda in World War II
    Type:
    Article
    Descripción/Resumen:
    After the liberation of North Africa, in 1943, it was discovered by policy makers within the Grand Alliance that both the British and Americans were in the process of making documentary films about the Operation Torch campaign. Fearful that separate films would highlight potential dissension with the Anglo-American alliance, the director Frank Capra was dispatched to London to coordinate his U.S. Army documentary with his British counter-parts. Instead of a smooth process, the joint film project bogged down in inter-service and inter-allied rivalry’s that delayed the completion of Tunisian Victory for over a year.
    Creador/Autor:
    Krome, Frederic
    Peticionario:
    Frederic Krome
    Fecha modificada:
    10/18/2016
    Fecha modificada:
    05/23/2019
    Fecha de creacion:
    1996
    Licencia:
    All rights reserved

  • Quique (Pais, Country)

    Media thumbnail: Quique (Pais, Country)
    Type:
    Media
    Descripción/Resumen:
    Collaboration with Poet/Performer Enrique Aviles. This video has its origins as a part of the “video set” for a performance by Aviles, directed by Davis Chung. In the theatrical piece Aviles played the roles of two immigrants to the US (one Mexican and one Korean) who live on opposite sides of a rooming house in the Adams Morgan neighborhood in DC. Subsequently, Aviles and I decided to create a stand alone video using one of his poems. The original footage of the neighborhood was supplemented with images of graffiti he produced and a shot of him reciting the poem in the backyard of his house in Arlington, VA.
    Creador/Autor:
    Aviles, Enrique (poetry); Airirang Korean Music and Dance Ensemble (music), and Woodman, Charles
    Peticionario:
    Charles Woodman
    Fecha modificada:
    03/23/2016
    Fecha modificada:
    05/07/2019
    Fecha de creacion:
    1996
    Licencia:
    All rights reserved