SCI Publications

2007


T.B. Terriberry, J.N. Damon, S.M. Pizer, S. Joshi, G. Gerig. “Population-Based Fitting of Medial Shape Models with Correspondence Optimization,” In Proceedings of Information Processing in Medical Imaging (IPMI '07), Lecture Notes in Computer Science, Vol. 20, pp. 700--712. July, 2007.


L.T. Tran, J. Kim, M. Berzins. “Solving Time-Dependent PDEs using the Material Point Method, A Case Study from Gas Dynamics,” SCI Institute Technical Report, No. UUSCI-2007-010, University of Utah, 2007.


J.K. Triedman, M. Jolley, R.S. MacLeod, J.G. Stinstra, D.H. Brooks, S. Pieper. “A System for Image Based Finite Element Modeling of Novel Defibrillation Strategies,” In Life Science Systems and Applications Workshop, 2007. LISA 2007, pp. 63--66. 2007.


J.K. Triedman, M. Jolley, R.S. MacLeod, J. Stinstra, D.H. Brooks, S. Pieper. “Finite Element Modeling of Novel Defibrillation Approaches in Children and Adults,” In Proc. LISSA Conf., Bethesda, MD, November, 2007.


S.X. Vasquez, A.N. Bahadur, J.T. Johnson III, D.R. Rodriguez, C. Keller. “Severe Runting of a Laboratory Mouse (Mus musculus),” In Lab Animal, Vol. 36, No. 1, pp. 19, 22--23. January, 2007.


H.T. Vo, S.P. Callahan, P. Lindstrom, V. Pascucci, C.T. Silva. “Streaming Simplification of Tetrahedral Meshes,” In IEEE Transactions on Visualization and Computer Graphics, Vol. 13, No. 1, pp. 145--155. Jan/Feb, 2007.


H.T. Vo, S.P. Callahan, N. Smith, C.T. Silva, W. Martin, D. Owen, D.M. Weinstein. “iRun: Interactive Rendering of Large Unstructured Grids,” In Proceedings of the 7th Eurographics Symposium on Parallel Graphics and Visualization (EGPGV 2007), pp. 93--100. 2007.


I. Wald, S. Boulos, P. Shirley. “Ray Tracing Deformable Scenes using Dynamic Bounding Volume Hierarchies,” In ACM Transactions on Graphics, Vol. 26, No. 1, 2007.


I. Wald, H. Friedrich, C.D. Hansen. “Interactive Isosurface Ray Tracing of Time-Varying Tetrahedral Volumes,” SCI Institute Technical Report, No. UUSCI-2007-003, University of Utah, 2007.


I. Wald, H. Friedrich, A. Knoll, C.D. Hansen. “Interactive Isosurface Ray Tracing of Time-Varying Tetrahedral Volumes,” In IEEE Transactions on Visualization and Computer Graphics, Vol. 13, No. 6, pp. 1727--1734. 2007.
DOI: 10.1109/TVCG.2007.70566


I. Wald, C. Gribble, S. Boulos, A. Kensler. “SIMD Ray Stream Tracing - SIMD Ray Traversal with Generalized Ray Packets and On-the-fly Re-Ordering -,” SCI Institute Technical Report, No. UUSCI-2007-012, University of Utah, 2007.


I. Wald, W.R. Mark, J. Günther, S. Boulos, T. Ize, W. Hunt, S.G. Parker, P. Shirley. “State of the Art in Ray Tracing Animated Scenes,” In Proceedings of Eurographics 2007, State of the Art Reports, pp. (accepted). 2007.


I. Wald. “On fast Construction of SAH based Bounding Volume Hierarchies,” In Proceedings of the 2007 Eurographics/IEEE Symposium on Interactive Ray Tracing, pp. 33--40. 2007.


G.H. Weber, P.-T. Bremer, V. Pascucci. “Topological Landscapes: A Terrain Metaphor for Scientific Data,” In IEEE Transactions on Visualization and Computer Graphics, Note: (presented at IEEE VIS 2007), 2007.


G.H. Weber, S.E. Dillard, H. Carr, V. Pascucci, B. Hamann. “Topology-controlled volume rendering,” In IEEE Transactions on Visualization and Computer Graphics, Vol. 13, No. 2, pp. 330--341. January, 2007.


A. Wiebel, X. Tricoche, D. Schneider, Heike Jänicke, Gerik Scheuermann. “Generalized Streak Lines: Analysis and Visualization of Boundary Induced Vortices,” In Proceeding of IEEE Visualization 2007, pp. 1735--1742. 2007.


C.H. Wolters, H. Köstler, C. Möller, J. Härtlein, L. Grasedyck, W. Hackbusch. “Numerical Mathematics of the Subtraction Method for the Modeling of a Current Dipole in EEG Source Reconstruction Using Finite Element Head Models,” In SIAM J. on Scientific Computing, Vol. 30, No. 1, pp. 24--45. 2007.


C.H. Wolters, H. Köstler, C. Möller, J. Härdtlein, A. Anwander. “Numerical Approaches for Dipole Modeling in Finite Element Method Based Source Analysis,” In New Frontiers in Biomagnetism. Proceedings of the 15th International Conference on Biomagnetism, Vancouver, BC, Canada, August 21-25, 2006., International Congress Series, Vol. 1300, pp. 189--192. June, 2007.


D. Xiu, J. Shen. “An Efficient Spectral Method for Acoustic Scattering from Rough Surfaces,” In Communications in Computational Physics, Vol. 2, No. 1, pp. 54--72. 2007.
DOI: 10.1.1.111.815

ABSTRACT

An efficient and accurate spectral method is presented for scattering problems with rough surfaces. A probabilistic framework is adopted by modeling the surface roughness as random process. An improved boundary perturbation technique is employed to transform the original Helmholtz equation in a random domain into a stochastic Helmholtz equation in a fixed domain. The generalized polynomial chaos (gPC) is then used to discretize the random space; and a Fourier-Legendre method to discretize the physical space. These result in a highly efficient and accurate spectral algorithm for acoustic scattering from rough surfaces. Numerical examples are presented to illustrate the accuracy and efficiency of the present algorithm.

Keywords: Acoustic scattering, spectral methods, stochastic inputs, differential equations, uncertainty quantification


D. Xiu. “Efficient Collocational Approach for Parametric Uncertainty Analysis,” In Communications in Computational Physics, Vol. 2, No. 2, pp. 293--309. 2007.

ABSTRACT

A numerical algorithm for effective incorporation of parametric uncertainty into mathematical models is presented. The uncertain parameters are modeled as random variables, and the governing equations are treated as stochastic. The solutions, or quantities of interests, are expressed as convergent series of orthogonal polynomial expansions in terms of the input random parameters. A high-order stochastic collocation method is employed to solve the solution statistics, and more importantly, to reconstruct the polynomial expansion. While retaining the high accuracy by polynomial expansion, the resulting \"pseudo-spectral\" type algorithm is straightforward to implement as it requires only repetitive deterministic simulations. An estimate on error bounded is presented, along with numerical examples for problems with relatively complicated forms of governing equations.

Keywords: Collocation methods, pseudo-spectral methods, stochastic inputs, random differential equations, uncertainty quantification