Now showing items 1735-1754 of 4073

    • 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 M.; 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. ...
    • Human exposure to particles at the air-water interface: Influence of water quality on indoor air quality from use of ultrasonic humidifiers 

      Yaho, Wenchuo; Dal Porto, Rachel; Gallagher, Daniel L.; Dietrich, Andrea M. (Elsevier, 2020-07-02)
      Ultrasonic humidifiers provide indoor relief to symptoms caused by dry air and produce aerosols containing both water and minerals that are present in the water that fills the humidifier. This study investigated the spatial ...
    • Human Factors and Software Reuse: The Manager's Impact 

      Lewis, John A.; Henry, Sallie M.; Kafura, Dennis G.; Schulman, Robert S. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1992), TR-92-13
      This paper describes the results of a controlled experiment designed to evaluate the impact of human factors on software reuse. The experiment concludes that (1) software reuse promotes higher productivity than no reuse, ...
    • Human Gait During Level Walking With an Occupational Whole-Body Powered Exoskeleton: Not Yet a Walk in the Park 

      Kim, Sunwook; Srinivasan, Divya; Nussbaum, Maury A.; Leonessa, Alexander (IEEE, 2021-04-01)
      With rapid advancements in exoskeleton technologies, a whole-body powered exoskeleton (WB-PEXO) for augmenting human physical capacity (a ``super-operator'') is generating increasing attention as an integral part of Industry ...
    • A Human Motor Behavior Model for Direct Pointing at a Distance 

      Kopper, Regis; Bowman, Douglas A.; Silva, Mara G. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2008-12-01), TR-08-26
      Models of human motor behavior are well known as an aid in the design of user interfaces (UIs). Most current models apply primarily to desktop interaction, but with the development of non-desktop UIs, new types of motor ...
    • Human-Computer Interface Development: Concepts and Systems for its Management 

      Hartson, H. Rex; Hix, Deborah (Department of Computer Science, Virginia Polytechnic Institute & State University, 1986), TR-86-07
      Human-computer interface management, from a computer science viewpoint, focuses on the process of developing quality human computer interfaces, including their representation, design, implementation, execution, evaluation, ...
    • A Hybrid Approach to Estimating Error Covariances in Variational Data Assimilation 

      Cheng, Haiyan; Jardak, Mohamed; Alexe, Mihai; Sandu, Adrian (Department of Computer Science, Virginia Polytechnic Institute & State University, 2009-03-01), TR-09-04
      Data Assimilation (DA) involves the combination of observational data with the underlying dynamical principles governing the system under observation. In this work we combine the advantages of the two prominent advanced ...
    • Hybrid broadband ground motion simulation validation of small magnitude earthquakes in Canterbury, New Zealand 

      Lee, Robin L.; Bradley, Brendon A.; Stafford, Peter J.; Graves, Robert W.; Rodriguez-Marek, Adrian (2020-05)
      Ground motion simulation validation is an important and necessary task toward establishing the efficacy of physics-based ground motion simulations for seismic hazard analysis and earthquake engineering applications. This ...