Now showing items 246-265 of 774

    • C++ and Fortran 77 Timing Comparisons 

      Keenan, Philip T. (1993-01)
      Recently there has been considerable debate within the scientific computation community over the suitability of C++ for large scale numerical computation. This note reports on timing studies of Fortran 77 and C++ conducted ...
    • Calculation and Implementation of the Gradient of the DSO Objective Function for the General Acoustic Model 

      Sei, Alain (1993-03)
      We present in this paper the computation of the DSO objective function in the general acoustic case. In this model, the density and the velocity are functions of the space variables. We use a perturbational approach, ...
    • Cardinal Interpolating Multiresolutions 

      Lewis, Robert Michael (1990-11)
    • Case Studies For a First-Order Fobust Nonlinear Programming 

      Hale, Elaine; Zhang, Yin (2006-06)
      In this paper, we conduct three case studies to assess the effectiveness of a recently proposed first-order method for robust nonlinear programming (Ref. 1). Three robust nonlinear programming problems were chosen from the ...
    • Characteristic Shape Sequences for Measures on Images 

      Pingel, Rachael L.; Abramson, Mark A.; Asaki, Thomas J.; Dennis, J.E. Jr. (2006-11)
      Researchers in many fields often need to quantify the similarity between images using metrics that measure qualities of interest in a robust quantitative manner. We present here the concept of image dimension reduction ...
    • Characteristic-Galerkin Methods for Contaminant Transport with Non-Equilibrium Adsorption Kinetics 

      Dawson, C.N.; van Duijn, C.J.; Wheeler, M.F. (1992-08)
      A procedure based on combining the method of characteristics with a Galerkin finite element method is analyzed for approximating reactive transport in groundwater. In particular, we consider equations modeling contaminant ...
    • Client-Server Component Architecture for Scientific Computing 

      Dajani, Hala N. (2003-06)
      In a Distributed Computing Environment software components dispersed on a variety of computer platforms communicate transparently with each other to emulate a single computer platform. One distributed component framework ...
    • Clique Generalizations and Related Problems 

      Wood, Cynthia Ivette (2016-05)
      A large number of real-world problems can be model as optimization problems in graphs. The clique model was introduced to aid the study of network structure for social interaction. Each vertex represented an actor and the ...
    • Coherent Interferometric Imaging, Time Gating and Beamforming 

      Borcea, Liliana; Garnier, Josselin; Papanicolaou, George; Tsogka, Chrysoula (2010-12)
      Coherent interferometric imaging is based on the backpropagation of local space-time cross correlations of array data and was introduced in order to improve images when the medium between the array and the object to be ...
    • Coherent Noise Suppression in Velocity Inversion 

      Gockenbach, Mark S.; Symes, William W. (1999)
      Data components with well-defined moveout other than primary reflections are sometimes called coherent noise. Coherent noise makes velocity analysis ambiguous, since no single velocity function explains incompatible moveouts ...
    • Collaborative Spectrum Sensing from Sparse Observations Using Matrix Completion 

      Meng, Jia; Yin, Wotao; Li, Husheng; Houssian, Ekram; Han, Zhu (2009-12)
      In cognitive radio, spectrum sensing is a key component to detect spectrum holes (i.e., channels not used by any primary users). Collaborative spectrum sensing among the cognitive radio nodes is expected to improve the ...
    • Column-Secant Update Technique for Solving Systems of Nonlinear Equations 

      Li, Guangye; Liu, Tingzhan (1991-10)
      This paper presents a QR update implementation of the successive column correction (SCC) method and a column-secant modification of the SCC method, which is called the CSSCC method. The computational cost of the QR update ...
    • Comparing Objective Functions for Velocity Inversion 

      Gockenbach, Mark S.; Symes, William W. (1993-10)
      The success of automatic velocity inversion is highly dependent on the numerical tractability of the optimization problem which defines the solution. The purpose of this paper is to compare the objective (cost) functions ...
    • Comparing Problem Formulation for Coupled Sets of Component 

      Arroyo, S.F.; Cramer, E.J.; Frank, P.D.; Dennis, J.E. Jr. (2007-11)
      In this paper several formulations and comparative test results are presented for problems involving the general paradigm of coupled sets of components. This paradigm is general enough to include systems of systems (SoS) ...
    • A Comparison of High Order Interpolation Nodes for the Pyramid 

      Chan, Jesse; Warburton, T. (2015)
      The use of pyramid elements is crucial to the construction of efficient hex-dominant meshes [M. Bergot, G. Cohen, and M. Duruflé, J. Sci. Comput., 42 (2010), pp. 345--381]. For conforming nodal finite element methods with ...
    • Comparison of Reduced Models for Blood Flow Using Runge–Kutta Discontinuous Galerkin Methods 

      Puelz, Charles; Riviere, Beatrice; Canic, Suncica; Rusin, Craig G. (2015-11)
      Reduced, or one–dimensional blood flow models take the general form of nonlinear hyperbolic systems, but differ greatly in their formulation. One class of models considers the physically conserved quantities of mass and ...
    • Comparison of Two Sets of First-order Conditions as Bases of Interior-Point Newton Methods for Optimization with Simple Bounds 

      Jamrog, Diane C.; Tapia, Richard A.; Zhang, Yin (2001-06)
      In this paper, we compare the behavior of two Newton interior-point methods derived from two different first-order necessary conditions for the same nonlinear optimization problem with simple bounds. One set of conditions ...
    • Complex Flow and Transport Phenomena in Porous Media 

      Cesmelioglu, Aycil (2010-04)
      This thesis analyzes partial differential equations related to the coupled surface and subsurface flows and develops efficient high order discontinuous Galerkin (DG) methods to solve them numerically. Specifically, the ...
    • Compositional heterogeneity near the base of the mantle transition zone beneath Hawaii 

      Yu, Chunquan; Day, Elizabeth A.; de Hoop, Maarten V.; Campillo, Michel; Goes, Saskia; Blythe, Rachel A.; van der Hilst, Robert D. (2018)
      Global seismic discontinuities near 410 and 660 km depth in Earth’s mantle are expressions of solid-state phase transitions. These transitions modulate thermal and material fluxes across the mantle and variations in their ...
    • Compressive Sensing Based High Resolution Channel Estimation for OFDM System 

      Meng, Jia (Jasmine); Yin, Wotao; Li, Yingying; Nguyen, Nam T.; Han, Zhu (2011-08)
      Orthogonal frequency division multiplexing (OFDM) is a technique that will prevail in the next generation wireless communication. Channel estimation is one of the key challenges in OFDM, since high-resolution channel ...