Now showing items 1647-1666 of 3888

    • Hodiex: A Sixth Order Accurate Method for Solving Elliptical PDEs 

      Pitts, George G.; Ribbens, Calvin J. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1993), TR-93-01
      This paper describes a method for discretizing general linear two dimensional elliptical PDEs with variable coefficients, Lu=g, which achieves high orders of accuracy on an extended range of problems. The method can be ...
    • Hokie Flyer, Vol 1, No. 1 

      Marchman, James (Aerospace and Ocean Engineering, Virginia Polytechnic Institute and State University, 1994)
      Newsletter on events, research, and the state of the Department of Aerospace and Ocean Engineering in 1994.
    • Holographic video at 40 frames per second for 4-million object points 

      Tsang, P.; Cheung, W. K.; Poon, Ting-Chung; Zhou, C. (Optical Society of America, 2011-08-01)
      We propose a fast method for generating digital Fresnel holograms based on an interpolated wavefront-recording plane (IWRP) approach. Our method can be divided into two stages. First, a small, virtual IWRP is derived in a ...
    • HOMER: An Interactive System for Home Based Stroke Rehabilitation 

      Kelliher, Aisling; Choi, Jinwoo; Huang, Jia-Bin; Rikakis, Thanassis; Kitani, Kris (ACM, 2017)
      Delivering long term, unsupervised stroke rehabilitation in the home is a complex challenge that requires robust, low cost, scalable, and engaging solutions. We present HOMER, an interactive system that uses novel therapy ...
    • A Homotopy Algorithm for the Combined H-squared/H-to Infinity Model Reduction Problem 

      Yuzhen, Ge; Collins, Emmanuel G.; Watson, Layne T.; Bernstein, Dennis S. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1993-05-01), TR-93-15
      The problem of finding a reduced order model, optimal in the H-squared sense, to a given system model is a fundamental one in control system analysis and design. The addition of a H-to infinity constraint to the H-squared ...
    • A Homotopy Algorithm for the Combined H2/H&infin Model Reduction Problem 

      Yuzhen, Ge; Collins, Emmanuel G.; Watson, Layne T.; Bernstein, Dennis S. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1992), TR-92-41
      The problem of finding a reduced order model, optimal in the H2 sense, to a given system model is a fundamental one in control system analysis and design. The addition of an H∞ constraint to the H2 optimal model ...
    • A Homotopy Approach for Solving Constrained Optimization Problems 

      Vasudevan, G.; Watson, Layne T.; Lutze, F. H. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1988), TR-88-50
      A homotopy approach for solving constrained parameter optimization problems is examined. The first order necessary conditions, with the complementavity conditions represented using a technique due to Mangasarian, are ...
    • Homotopy Approaches to the H2 Reduced Order Model Problem 

      Zigic, Dragan; Watson, Layne T.; Collins, Emmanuel G.; Bernstein, Dennis S. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1991), TR-91-24
      The optimal projection approach to solving the H2 reduced order model problem produces two coupled, highly nonlinear matrix equations with rank conditions as constraints. The algorithms proposed herein utilize probability-one ...
    • A Homotopy Method Applied to Elastica Problems 

      Watson, Layne T.; Wang, Chang Y. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1980), CS80001-R
      The inverse problem in nonlinear (incompressible) elastica theory, where the end positions and inclinations rather than the forces and moment are specified, is considered. Based on the globally convergent Chow-Yorke ...
    • Homotopy methods for constraint relaxation in unilevel reliability based design optimization 

      Agarwal, Harish; Gano, Shawn E.; Renaud, John E.; Perez, Victor M.; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2007), TR-07-28
      Reliability based design optimization is a methodology for finding optimized designs that are characterized with a low probability of failure. The main ob jective in reliability based design optimization is to minimize ...
    • Homotopy Methods for Solving the Optimal Projection Equations for the H2 Reduced Order Model Problem 

      Zigic, Dragan; Watson, Layne T.; Collins, Emmanuel G.; Bernstein, Dennis S. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1991), TR-91-13
      The optimal projection approach to solving the H2 reduced order model problem produces two coupled, highly nonlinear matrix equations with rank conditions as constraints. Due to the resemblance of these equations to standard ...
    • HOMPACK90: A Suite of FORTRAN 90 Codes for Globally Convergent Homotopy Algorithms 

      Watson, Layne T.; Sosonkina, Masha; Melville, Robert C.; Morgan, Alexander P.; Walker, Homer F. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1996-07-01), TR-96-11
      HOMPACK90 is a FORTRAN 90 version of the FORTRAN 77 package HOMPACK (Algorithm 652), a collection of codes for finding zeros or fixed points of nonlinear systems using globally convergent probability-one homotopy algorithms. ...
    • HOMPACK: A Suite of Codes for Globally Convergent Homotopy Algorithms 

      Watson, Layne T.; Billups, Stephen C.; Morgan, Alexander P. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1990), TR-90-36
      There are algorithms for finding zeros or fixed points of nonlinear systems of equations that are globally convergent for almost all starting points, i.e., with probability one. The essence of all such algorithms is the ...
    • Horizontal-parallax-only electronic holography 

      Poon, Ting-Chung; Akin, T.; Indebetouw, Gary; Kim, Taegeun (Optical Society of America, 2005-04-01)
      The principle of optical scanning holography (OSH) is proposed to acquire horizontal-parallax-only (HPO) holographic information electronically. We first briefly summarize the results of OSH and then discuss how HPO-electronic ...
    • How Exposure to ”Role Model” Projects Can Lead to Decisions for More Sustainable Infrastructure 

      Harris, Nora; Shealy, Tripp; Klotz, Leidy (MDPI, 2016-01-30)
      A role model, whether an individual or a project, can inspire similar performance in others. This research examines such a phenomenon during the design process for more sustainable physical infrastructure. In this empirical ...
    • How soap bubbles freeze 

      Ahmadi, S. Farzad; Nath, Saurabh; Kingett, Christian M.; Yue, Pengtao; Boreyko, Jonathan B. (Springer Nature, 2019-06-18)
      Droplets or puddles tend to freeze from the propagation of a single freeze front. In contrast, videographers have shown that as soap bubbles freeze, a plethora of growing ice crystals can swirl around in a beautiful effect ...
    • How Spectrum Policy Enables Wireless Innovation: Wi-Fi and Bluetooth Origins 

      Marcus, Michael (2013-12-17)
      A seminar talk by Dr. Michael Marcus, a consultant and adjunct professor of ECE at VT. Abstract appears below.
    • How to Define the Next Generation Cardiac CT Architecture? - a Contemporary Challenge for Interdisciplinary Collaboration 

      Yu, Hengyong; DeMan, Bruno; Carr, Jeff; Frontera, Mark; Zeng, Kai; Bennett, James; Fitzgerald, Paul; Iatrou, Maria; Shen, Haiou; Santago, Peter; Wang, Ge (2010-05-21)
      Cardiovascular diseases are pervasive with high mortality and morbidity at tremendous social and healthcare costs. There are urgent needs for significantly higher fidelity cardiac CT with substantially lower radiation dose, ...
    • How wind drives the correlation between leaf shape and mechanical properties 

      Louf, Jean-Francois; Nelson, Logan; Kang, Hosung; Song, Pierre Ntoh; Zehnbauer, Tim; Jung, Sunghwan (Springer Nature, 2018-11-05)
      From a geometrical point of view, a non-sessile leaf is composed of two parts: a large flat plate called the lamina, and a long beam called the petiole which connects the lamina to the branch/stem. While wind is exerting ...
    • HSCT Configuration Design Space Exploration Using Aerodynamic Response Surface Approximations 

      Baker, Chuck A.; Grossman, Bernard; Haftka, Raphael T.; Mason, William H.; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1999-03-01), TR-99-01
      A method has been developed to generate and use polynomial approximations to the range and cruise drag components in a highly constrained, multidisciplinary design optimization of a High Speed Civil Transport configuration. ...