Browsing College of Engineering (COE) by Title
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Globally Convergent Parallel Algorithm for Zeros of Polynomial Systems
(Department of Computer Science, Virginia Polytechnic Institute & State University, 19860501), TR8625Certain classes of nonlinear systems of equations, such as polynomial systems, have properties that make them particularly amenable to solution on distributed computing systems. Some algorithms, considered unfavorably on ... 
Globally Optimal Transmitter Placement for Indoor Wireless Communication Systems
(Department of Computer Science, Virginia Polytechnic Institute & State University, 20020801), TR0217In 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
(Department of Computer Science, Virginia Polytechnic Institute & State University, 2004), TR0418DNA synthesis and nuclear division in the developing frog egg are controlled by fluctuations in the activity of Mphase promoting factor (MPF). The biochemical mechanism of MPF regulation is most easily studied in cytoplasmic ... 
GLSSOD: A Generalized Local Statistical Approach for Spatial Outlier Detection
(Department of Computer Science, Virginia Polytechnic Institute & State University, 20100301), TR1003Local 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!
(Virginia Tech, 20100330)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 supermodel theorem, which generalizes older results in two important, orthogonal ... 
Görtler instability
(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
(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 S4 and ... 
GPS phase scintillation at high latitudes during geomagnetic storms of 717 March 2012Part 1: The North American sector
(European Geosciences Union, 2015)The interval of geomagnetic storms of 717 March 2012 was selected at the Climate and Weather of the SunEarth System (CAWSES) II Workshop for group study of space weather effects during the ascending phase of solar cycle ... 
GPS phase scintillation at high latitudes during geomagnetic storms of 717 March 2012Part 2: Interhemispheric comparison
(European Geosciences Union, 2015)During the ascending phase of solar cycle 24, a series of interplanetary coronal mass ejections (ICMEs) in the period 717 March 2012 caused geomagnetic storms that strongly affected highlatitude ionosphere in the Northern ... 
GPU Power Prediction via Ensemble Machine Learning for DVFS Space Exploration
(Department of Computer Science, Virginia Polytechnic Institute & State University, 20180202), TR1801A softwarebased 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 ... 
GPUBased Acceleration for Interior Tomography
(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 ... 
GPUbased Streaming for Parallel Level of Detail on Massive Model Rendering
(Department of Computer Science, Virginia Polytechnic Institute & State University, 2011), TR1112Rendering massive 3D models in realtime 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
(Virginia Center for Transportation Innovation and Research, 20090901)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
(AIP Publishing, 20080301)Computer modeling and simulation reveals a grain size and compositiondependent behavior of phase coexistence around the morphotropic phase boundaries in polycrystals of ferroelectric solid solutions. It shows that the ... 
Grainboundary ordering, segregation, and melting transitions in a twodimensional latticegas model
(American Physical Society, 19890601)A twodimensional latticegas model of a binaryorderingalloy 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 orderdisorder ... 
Grainboundary structures in polycrystalline metals at the nanoscale
(American Physical Society, 20000701)We present a detailed analysis of grainboundary structures in computergenerated Cu and Ni threedimensional 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
(Department of Computer Science, Virginia Polytechnic Institute & State University, 19880501), TR8805Polynomial 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
(Department of Computer Science, Virginia Polytechnic Institute & State University, 19880501), TR8804Polynomial 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 Newtontype methods ... 
Graph Embeddings and Simplicial Maps
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1993), TR9340An 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
(Department of Computer Science, Virginia Polytechnic Institute & State University, 1989), TR8945We 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 ...