Now showing items 1417-1436 of 3614

    • Globally Optimal Transmitter Placement for Indoor Wireless Communication Systems 

      He, Jian; Verstak, Alex; Watson, Layne T.; Stinson, C.A.; Ramakrishnan, Naren; Shaffer, Clifford A.; Rappaport, T. S.; Anderson, C.R.; Bae, Kyung; Jiang, Jing; Tranter, William H. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2002-08-01), TR-02-17
      In this paper, a global optimization technique is applied to solve the optimal transmitter placement problem for indoor wireless systems. An efficient pattern search algorithm ---DIRECT (DIviding RECTangles) of Jones, ...
    • Globally Optimized Parameters for a Model of Mitotic Control in Frog Egg Extracts 

      Zwolak, Jason W.; Tyson, John J.; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2004), TR-04-18
      DNA synthesis and nuclear division in the developing frog egg are controlled by fluctuations in the activity of M-phase promoting factor (MPF). The biochemical mechanism of MPF regulation is most easily studied in cytoplasmic ...
    • GLS-SOD: A Generalized Local Statistical Approach for Spatial Outlier Detection 

      Chen, Feng; Lu, Chang-Tien; Boedihardjo, Arnold P. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2010-03-01), TR-10-03
      Local based approach is a major category of methods for spatial outlier detection (SOD). Currently, there is a lack of systematic analysis on the statistical properties of this framework. For example, most methods assume ...
    • Got the Flu (or Mumps)? Check the Eigenvalue! 

      Prakash, B. Aditya; Chakrabarti, Deepayan; Faloutsos, Michalis; Valler, Nicholas; Faloutsos, Christos (Virginia Tech, 2010-03-30)
      For a given, arbitrary graph, what is the epidemic threshold? That is, under what conditions will a virus result in an epidemic? We provide the super-model theorem, which generalizes older results in two important, orthogonal ...
    • Görtler instability 

      Ragab, Saad A.; Nayfeh, Ali H. (AIP Publishing, 1981)
      Görtler instability for boundary‐layer flows over generally curved walls is considered. The full‐linearized disturbance equations are obtained in an orthogonal curvilinear coordinate system. A perturbation procedure to ...
    • GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm 

      Prikryl, P.; Ghoddousi-Fard, R.; Kunduri, B. S. R.; Thomas, E. G.; Coster, A. J.; Jayachandran, P. T.; Spanswick, E.; Danskin, D. W. (Copernicus Publications, 2013)
      The amplitude and phase scintillation indices are customarily obtained by specialised GPS Ionospheric Scintillation and TEC Monitors (GISTMs) from L1 signal recorded at the rate of 50 Hz. The scintillation indices S-4 and ...
    • GPU Power Prediction via Ensemble Machine Learning for DVFS Space Exploration 

      Dutta, Bishwajit; Adhinarayanan, Vignesh; Feng, Wu-chun (Department of Computer Science, Virginia Polytechnic Institute & State University, 2018-02-02), TR-18-01
      A software-based approach to achieve high performance within a power budget often involves dynamic voltage and frequency scaling (DVFS). Consequently, accurately predicting the power consumption of an application at different ...
    • GPU-Based Acceleration for Interior Tomography 

      Liu, Rui; Luo, Yan; Yu, Hengyong (IEEE, 2014)
      The compressive sensing (CS) theory shows that real signals can be exactly recovered from very few samplings. Inspired by the CS theory, the interior problem in computed tomography is proved uniquely solvable by minimizing ...
    • GPU-based Streaming for Parallel Level of Detail on Massive Model Rendering 

      Peng, Chao; Cao, Yong (Department of Computer Science, Virginia Polytechnic Institute & State University, 2011), TR-11-12
      Rendering massive 3D models in real-time has long been recognized as a very challenging problem because of the limited computational power and memory space available in a workstation. Most existing rendering techniques, ...
    • Grade 300 Prestressing Strand and the Effect of Vertical Casting Position 

      Roberts-Wollmann, Carin L.; Cousins, Thomas E.; Carroll, C. (Virginia Center for Transportation Innovation and Research, 2009-09-01)
      The purpose of this investigation was (1) to compare the differences in the transfer length, development length, and flexural strength among Grade 300 strand, the traditional Grade 270 strand, and the predictions of these ...
    • Grain size effect of phase coexistence around morphotropic phase boundary in ferroelectric polycrystalline ceramics 

      Rao, W. F.; Wang, Yu. U. (AIP Publishing, 2008-03-01)
      Computer modeling and simulation reveals a grain size- and composition-dependent behavior of phase coexistence around the morphotropic phase boundaries in polycrystals of ferroelectric solid solutions. It shows that the ...
    • Grain-boundary ordering, segregation, and melting transitions in a two-dimensional lattice-gas model 

      Farkas, Diana; Jang, H. (American Physical Society, 1989-06-01)
      A two-dimensional lattice-gas model of a binary-ordering-alloy system was used to study the phase transitions and the atomic configuration near a Σ=5 grain boundary. The cluster variation method was used to study order-disorder ...
    • Grain-boundary structures in polycrystalline metals at the nanoscale 

      Van Swygenhoven, H.; Farkas, Diana; Caro, Alfredo (American Physical Society, 2000-07-01)
      We present a detailed analysis of grain-boundary structures in computer-generated Cu and Ni three-dimensional nanocrystalline samples. The study includes both totally random and textured microstructures with grain sizes ...
    • Granularity Issues for Solving Polynomial Systems via Globally Convergent Algorithms on a Hypercube 

      Allison, Donald C. S.; Chakraborty, Amal; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1988-05-01), TR-88-05
      Polynomial systems of equations frequently arise in many applications such as solid modeling, robotics, computer vision, chemistry, chemical engineering, and mechanical engineering . Locally convergent iterative methods ...
    • The Granularity of Parallel Homotopy Algorithms for Polynomial Systems of Equations 

      Allison, Donald C. S.; Harimoto, S.; Watson, Layne T. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1988-05-01), TR-88-04
      Polynomial systems consist of n polynomial functions in n variables, with real or complex coefficients. Finding zeros of such systems is challenging because there may be a large number of solutions, and Newton-type methods ...
    • Graph Embeddings and Simplicial Maps 

      Heath, Lenwood S. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1993), TR-93-40
      An undirected graph is viewed as a simplicial complex. The notion of a graph embedding of a guest graph in a host graph is generalized to the realm of simplicial maps. Dilation is redefined in this more general setting. ...
    • Graph Layout Using Queues 

      Heath, Lenwood S.; Rosenberg, Arnold L. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1989), TR-89-45
      We study the problem of laying out the edges of a graph using queues. In a k queue layout, vertices of the graph are placed in some linear order and each edge is assigned to exactly one of the k queues so that the edges ...
    • Graph-based Diagnosis of Discrete Event Model Specifications 

      Overstreet, C. Michael; Nance, Richard E. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1983), CS83028-R
      Several diagnostics which assist in the construction of specifications for discrete event simulation models are defined. The model specifications to be analyzed must be in a particular form called a Condition Specification. ...
    • Graphene-modified Electrodes for Enhancing the Performance of Microbial Fuel Cells 

      Yuan, Heyang; He, Zhen (The Royal Society of Chemistry, 2014-11-03)
      Graphene is an emerging material with superior physical and chemical properties, which can benefit the development of microbial fuel cells (MFC) in several aspects. Graphene-based anodes can enhance MFC performance with ...
    • A Grassroots Approach to Graduate Teaching Assistant Mentoring 

      Mayo, Kevin A.; Wake, Steven A. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1993), TR-93-26
      Graduate students, whether master's or doctoral candidates, benefit greatly from their academic experiences. However, graduate school is not limited to course work and research, but it also includes teaching experiences ...