Now showing items 1516-1535 of 3583

    • 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. ...
    • 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, ...
    • A Human Motor Behavior Model for Direct Pointing at a Distance 

      Kopper, Regis; Bowman, Doug 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 Composites Based on Carbon Fiber/Carbon Nanofilament Reinforcement 

      Tehrani, Mehran; Yari Boroujeni, Ayoub; Luhrs, Claudia; Phillips, Jonathan; Al-Haik, Marwan S. (MDPI, 2014-05-28)
      Carbon nanofilament and nanotubes (CNTs) have shown promise for enhancing the mechanical properties of fiber-reinforced composites (FRPs) and imparting multi-functionalities to them. While direct mixing of carbon nanofilaments ...
    • Hybrid detector modules and dynamic thresholding for spectral CT 

      Virginia Tech Intellectual Properties, Inc.; Wang, Ge; Cong, Wenxiang; Chu, Jiyang (United States Patent and Trademark Office, 2018-01-09)
      A system and method that comprises an X-ray source configured to emit an X-ray beam; an object positioned to receive the X-ray beam; a detector configured to receive an attenuated beam of the X-rays through the object for ...
    • Hybrid Experiential-Heuristic Cognitive Radio Engine Architecture and Implementation 

      Amanna, Ashwin; Ali, Daniel; Fitch, David Gonzalez; Reed, Jeffrey H. (Hindawi, 2012-05-16)
      The concept of cognitive radio (CR) focuses on devices that can sense their environment, adapt configuration parameters, and learn from past behaviors. Architectures tend towards simplified decision-making algorithms ...
    • Hybrid interleaving structure with adaptive phase locked loop for variable frequency controlled switching converter 

      Virginia Tech Intellectual Properties, Inc.; Li, Qiang; Liu, Pei-Hsin; Lee, Fred C. (United States Patent and Trademark Office, 2018-07-03)
      In a multi-phase power converter using a phase-locked loop (PLL) arrangement for interleaving of pulse frequency modulated (PFM) pulses of the respective phases, improved transient response, improved stability of high ...
    • Hybrid metamaterials for electrically triggered multifunctional control 

      Liu, Liu; Kang, Lei; Mayer, Theresa S.; Werner, Douglas H. (Springer Nature, 2016-10-27)
      Despite the exotic material properties that have been demonstrated to date, practical examples of versatile metamaterials remain exceedingly rare. The concept of metadevices has been proposed in the context of hybrid ...
    • A Hybrid Model for Role-related User Classification on Twitter 

      Li, Liuqing; Song, Ziqian; Zhang, Xuan; Fox, Edward A. (Virginia Tech, 2018-11-15)
      To aid a variety of research studies, we propose TWIROLE, a hybrid model for role-related user classification on Twitter, which detects male-related, female-related, and brand-related (i.e., organization or institution) ...
    • A Hybrid Monte-Carlo sampling smoother for four-dimensional data assimilation 

      Attia, A; Rao, V; Sandu, A (Wiley-Blackwell, 2017-01-10)
    • Hybrid RANS/LES Turbulence Model Applied to a Transitional Unsteady Boundary Layer on Wind Turbine Airfoil 

      Zhang, Di; Cadel, Daniel R.; Paterson, Eric G.; Lowe, K. Todd (MDPI, 2019-07-11)
      A hybrid Reynolds-averaged Navier Stokes/large-eddy simulation (RANS/LES) turbulence model integrated with a transition formulation is developed and tested on a surrogate model problem through a joint experimental and ...
    • A Hybrid Variational/Ensemble Filter Approach to Data Assimilation 

      Sandu, Adrian; Cheng, Haiyan (Department of Computer Science, Virginia Polytechnic Institute & State University, 2009-08-01), TR-09-25
      Two families of methods are widely used in data assimilation: the four dimensional variational (4D-Var) approach, and the ensemble Kalman filter (EnKF) approach. The two families have been developed largely through parallel ...
    • Hyperbolic heat conduction with temperature-dependent thermal conductivity 

      Glass, D. E.; Ozisik, M. Necati; McRae, D. S.; Vick, Brian (American Institute of Physics, 1986-03-15)
      Hyperbolic heat conduction in a semi-infinite slab with temperature-dependent thermal conductivity is studied numerically, and the results are compared with those obtained from the classical parabolic equation for the ...
    • Hypoxia-induced compression in the tracheal system of the tobacco hornworm caterpillar, Manduca sexta 

      Greenlee, K. J.; Socha, J. J.; Eubanks, H. B.; Pedersen, P.; Lee, W. K.; Kirkton, S. D. (Company of Biologists Ltd., 2013-06-01)
      Abdominal pumping in caterpillars has only been documented during molting. Using synchrotron X-ray imaging in conjunction with high-speed flow-through respirometry, we show that Manduca sexta caterpillars cyclically contract ...
    • I-Schools as a Natural Home for Digital Libraries Education 

      Wildemuth, Barbara M.; Pomerantz, Jeffrey P.; Oh, Sanghee; Yang, Seungwon; Fox, Edward A. (2009-01-19)
      Given that digital libraries (DLs) bring together technology, information, and people who use information, it can easily be argued that i-schools should play a central role in educating DL professionals. This study examines ...
    • Iaverage current mode (ACM) control for switching power converters 

      Virginia Tech Intellectual Properties, Inc.; Lee, Fred C.; Mattavelli, Paolo; Yan, Yingyi (United States Patent and Trademark Office, 2016-05-17)
      Providing a fast current sensor direct feedback path to a modulator for controlling switching of a switched power converter in addition to an integrating feedback path which monitors average current for control of a modulator ...