SCI Publications
2007
K. Damevski, A. Swaminathan, S.G. Parker.
“CCALoop: Scalable Design of a Distributed Component Framework,” In Proceedings of the 16th International High Performance Distributed Computing Symposium (HPDC 2007), pp. 213--214. 2007.
J.D. Daniels, L. Ha, T. Ochotta, C.T. Silva.
“Robust Smooth Feature Extraction from Point Clouds,” In Proceedings of the 2007 International Conference on Shape Modeling and Applications, Lyon, France, 2007.
B. Davis, P.T. Fletcher, E. Bullitt, S. Joshi.
“Population Shape Regression From Random Design Data,” In Proceedings of the Eleventh IEEE International Conference on Computer Vision (ICCV '07), pp. 1-7. 2007.
S. Davidson, S. Cohen-Boulakia, A. Eyal, B. Ludascher, T. McPhillips, S. Bowers, J. Freire.
“Provenance in Scientific Workflow Systems,” In IEEE Data Engineering Bulletin, Vol. 32, No. 4, pp. 44--50. 2007.
C.C. Douglas, M.J. Cole, P. Dostert, Y. Efendiev, R.E. Ewing, G. Haase, J. Hatcher, M. Iskandarani, C.R. Johnson, R.A. Lodder.
“Dynamically identifying and tracking contaminants in water bodies,” In Proceedings of the 7th International Conference on Computational Science (ICCS) 2007, Part I, Beijing, China, Lecture Notes in Computer Science (LNCS), Vol. 4887, Edited by Y. Shi and G.D. van Albada and P.M.A. Sloot and J.J. Dongarra, Springer-Verlag, Berlin Heidelberg, pp. 1002--1009. May, 2007.
C.C. Douglas, D. Bansal, J.D. Beezley, L.S. Bennethum, S. Chakraborty, J.L. Coen, Y. Efendiev, R.E. Ewing, J. Hatcher, M. Iskandarani, C.R. Johnson, M. Kim, D. Li, R.A. Lodder, J. Mandel, G. Qin, A. Vodacek.
“Dynamic data-driven application systems for empty houses, contaminat tracking, and wildland fireline prediction,” In Grid-Based Problem Solving Environments, IFIP series, Edited by P.W. Gaffney and J.C.T. Pool, Springer-Verlag, Berlin, pp. 255-272. 2007.
DOI: 10.1007/978-0-387-73659-4_14
C. Duncan, R. Scherer, J. Guilkey, T. Harman.
“Simulations of Vocal Fold Movement and Aerodynamics Using the Uintah Computational Framework,” In Journal of the Acoustical Society of America, Vol. 121, No. 5, pp. 3201-3202. 2007.
DOI: 10.1121/1.4782473
This study applies a tightly coupled fluid‐structure interaction algorithm to the modeling of phonation. The Uintah Computational Framework models vocal fold material using the Material Point Method (MPM), which permits arbitrarily large material displacements and multiple materials characterizing the vocal fold properties. The air is modeled using a compressible Navier‐Stokes solver, the Implicit Continuous‐fluid Eulerian (ICE) method developed at Los Alamos National Laboratory by B. A. Kashiwa. The MPM and ICE methods are coupled together to generate a unique simulation tool. Preliminary simulations are shown of 2‐D model vocal folds interacting with prescribed transglottal pressures between 100 Pa and 800 Pa illustrating the intrinsic coupling between the vocal folds and the air. Results are presented showing how the new simulation scheme characterizes the materials and how the aerodynamics that results displays the essential characteristics of glottal flow. The next steps of incorporating three‐dimensionality and acoustics will be discussed. The present simulations set the stage for a realistic computational glottis and for eventual modeling of the effects of vocal fold pathologies on the acoustical output. [Work supported at Bowling Green State University in part by the National Institutes of Health and at the University of Utah by the Department of Energy.]
P.T. Fletcher, S. Joshi.
“Riemannian Geometry for the Statistical Analysis of Diffusion Tensor Data,” In Signal Processing, Vol. 87, No. 2, pp. 250--262. February, 2007.
P.T. Fletcher, R. Tao, W.-K. Jeong, R.T. Whitaker.
“A Volumetric Approach to Quantifying Region-to-Region White Matter Connectivity in Diffusion Tensor MRI,” In Information Processing in Medical Imaging, Vol. 4584/2007, pp. 346--358. 2007.
P.T. Fletcher, S. Powell, N.L. Foster, S. Joshi.
“Quantifying Metabolic Asymmetry Modulo Structure in Alzheimer's Disease,” In Lecture Notes in Computer Science, Springer, pp. 446--457. 2007.
DOI: 10.1007/978-3-540-73273-0_37
PubMed ID: 17633720
H. Friedrich, I. Wald, P. Slusallek.
“Interactive Iso-Surface Ray Tracing of Massive Volumetric Data Sets,” In Proceedings of the 2007 Eurographics Symposium on Parallel Graphics and Visualization, pp. 109--116. 2007.
C. Garth, G. Li, X. Tricoche, C.D. Hansen, H. Hagen.
“Visualization of Coherent Structures in Transient 2D Flows,” In Proceedings of the 2007 Workshop on Topology-Based Method in Visualization (TopoInVis), Grimma, Germany, March, 2007.
C. Garth, F. Gerhardt, X. Tricoche, H. Hagen.
“Efficient Computation and Visualization of Coherent Structures in Fluid Flow Applications,” In Proceeding of IEEE Visualization 2007, pp. 1464--1471. 2007.
C. Garth, B. Laramee, X. Tricoche, H. Hauser, J. Schneider.
“Extraction and Visualization of Swirl and Tumble Motion from Engine Simulation Data,” In Topology-based Methods in Visualization, Mathematics and Visualization, Springer Berlin Heidelberg, pp. 121--135. 2007.
ISBN: 978-3-540-70822-3
DOI: 10.1007/978-3-540-70823-0_9
An optimal combustion process within an engine block is central to the performance of many motorized vehicles. Associated with this process are two important patterns of flow: swirl and tumble motion, which optimize the mixing of fluid within each of an engine's cylinders. The simulation data associated with in-cylinder tumble motion within a gas engine, given on an unstructured, timevarying and adaptive resolution CFD grid, demands robust visualization methods that apply to unsteady flow. Good visualizations are necessary to analyze the simulation data of these in-cylinder flows. We present a range of methods including integral, feature-based, and image-based schemes with the goal of extracting and visualizing these two important patterns of motion. We place a strong emphasis on automatic and semi-automatic methods, including topological analysis, that require little or no user input.We make effective use of animation to visualize the time-dependent simulation data. We also describe the challenges and implementation measures necessary in order to apply the presented methods to time-varying, volumetric grids.
S.E. Geneser, R.M. Kirby, D. Xiu, F.B. Sachse.
“Stochastic Markovian Modeling of Electrophysiology of Ion Channels: Reconstruction of Standard Deviations in Macroscopic Currents,” In Journal of Theoretical Biology, Vol. 245, No. 4, pp. 627--637. 2007.
DOI: 10.1016/j.jtbi.2006.10.016
Markovian models of ion channels have proven useful in the reconstruction of experimental data and prediction of cellular electrophysiology. We present the stochastic Galerkin method as an alternative to Monte Carlo and other stochastic methods for assessing the impact of uncertain rate coefficients on the predictions of Markovian ion channel models. We extend and study two different ion channel models: a simple model with only a single open and a closed state and a detailed model of the cardiac rapidly activating delayed rectifier potassium current. We demonstrate the efficacy of stochastic Galerkin methods for computing solutions to systems with random model parameters. Our studies illustrate the characteristic changes in distributions of state transitions and electrical currents through ion channels due to random rate coefficients. Furthermore, the studies indicate the applicability of the stochastic Galerkin technique for uncertainty and sensitivity analysis of bio-mathematical models.
Keywords: Stochastic Galerkin, Polynomial chaos, Stochastic processes, Markov modeling, Ion channels
S. Gerber, T. Tasdizen, R.T. Whitaker.
“Robust Non-linear Dimensionality Reduction using Successive 1-Dimensional Laplacian Eigenmaps,” In Proceedings of the 2007 International Conference on Machine Learning (ICML), pp. 281--288. 2007.
A. Ghodrati, D.H. Brooks, R.S. MacLeod.
“Methods of Solving Reduced Lead Systems for Inverse Electrocardiography,” In IEEE Trans Biomed Eng, Vol. 54, No. 2, pp. 339--343. February, 2007.
PubMed ID: 17278592
J.H. Gilmore, W. Lin, I. Corouge, Y.S. Vetsa, J.K. Smith, C. Kang, H. Gu, R.M. Hamer, J.A. Lieberman, G. Gerig.
“Early Postnatal Development of Corpus Callosum and Corticospinal White Matter Assessed with Quantitative Tractography,” In American Journal of Neuroradiology, Vol. 28, No. 9, pp. 1789--1795. October, 2007.
J.H. Gilmore, W. Lin, M.W. Prastawa, C.B. Looney, Y.S.K. Vetsa, R.C. Knickmeyer, D.D. Evans, J.K. Smith, R.M. Hamer, J.A. Lieberman, G. Gerig.
“Regional Gray Matter Growth, Sexual Dimorphism, and Cerebral Asymmetry in the Neonatal Brain,” In Journal of Neuroscience, Vol. 27, No. 6, pp. 1255--1260. 2007.
J.H. Gilmore, L. Smith, C. Kang, R. Hamer, H. Wolfe, B. Hertzberg, J.K. Smith, N. Chescheir, W. Lin, G. Gerig.
“Neonatal Brain Structure in Children with Prenatal Isolated Mild Ventriculomegaly,” In Proceedings American Conference of Neuropharmacology (ACNP) 2007, Boca Raton, FL, Note: abstract., 2007.