SCI Publications
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.
C. Goodlett, P.T. Fletcher, W. Lin, G. Gerig.
“Quantification of Measurement Error in DTI: Theoretical Predictions and Validation,” In Proceedings of The 10th International Conference on Medical Image Computing and Computer Assisted Intervention (MICCAI 2007), Lecture Notes in Computer Science, Vol. 4792, pp. 10--17. November, 2007.
PubMed ID: 18051038
C.E. Goodyer, M. Berzins.
“Parallelisation and Scalability Issues of a Multilevel EHL Solver,” In Concurrency and Computation: Practice and Experience, Vol. 19, No. 4, pp. 369--396. 2007.
C.B. Goodlett, P.T. Fletcher, W. Lin, G. Gerig.
“Noise-Induced Bias in Low-Direction Diffusion Tensor MRI: Replication of Monte-Carlo Simulation with In-Vivo Scans,” In Proceedings of ISMRM 2007, 2007.
K. Gorczowski, M. Styner, J.Y. Jeong, J.S. Marron, J. Piven, H.C. Hazlett, S.M. Pizer, G. Gerig.
“Statistical Shape Analysis of Multi-Object Complexes,” In Proceedings of the 2007 IEEE Conference on Computer Vision and Pattern Recognition, pp. 1--8. 2007.
K. Gorczowski, M. Stynera, J.Y. Jeonga, J.S. Marron, J. Piven, H.C. Hazlett, S.M. Pizer, G. Gerig.
“Discrimination Analysis using Multi-Object Statistics of Shape and Pose,” In Proceedings of the 2007 SPIE Conference, Vol. 6512, January, 2007.
S. Gouttard, M. Styner, S. Joshi, R.G. Smith, H.C. Hazlett, G. Gerig.
“Subcortical Structure Segmentation Using Probabilistic Atlas Priors,” In Medical Imaging 2007: Image Processing, Vol. 6512, No. 65122J, Note: Presented at Worshop - 3D Segmentation in the Clinic: a Grand Challenge, Edited by J.P. W. Pluim and J.M. Reinhardt, SPIE Intl Soc Optical Eng, March, 2007.
C.P. Gribble, S.G. Parker.
“Interactive Visualization with Advanced Shading Models using Lazy Evaluation,” In Proceedings of the 2007 Eurographics Symposium on Parallel Graphics and Visualization, pp. 37--44. 2007.
C.P. Gribble, C. Brownlee, S.G. Parker.
“Practical Global Illumination for Interactive Particle Visualization,” In Computers and Graphics, Vol. 32, No. 1, pp. 14--24. February, 2007.
J.E. Guilkey, T.B. Harman, B. Banerjee.
“An Eulerian-Lagrangian Approach for Simulating Explosions of Energetic Devices,” In Computers and Structures, Vol. 85, No. 11-14, pp. 660--674. June-July, 2007.
DOI: 10.1016/j.compstruc.2007.01.031
An approach for the simulation of explosions of "energetic devices" is described. In this context, an energetic device is a metal container filled with a high explosive (HE). Examples include bombs, mines, rocket motors or containers used in storage and transport of HE material. Explosions may occur due to detonation or deflagration of the HE material, with initiation resulting from either mechanical or thermal input. This approach is applicable to a wide range of fluid–structure interaction scenarios, the application to energetic devices is chosen because it demonstrates the full capability of this methodology.
Simulations of this type are characterized by a number of interesting and challenging behaviors. These include the transformation of the solid HE into highly pressurized gaseous products that initially occupy regions which formerly contained only solid material. This rapid pressurization of the container leads to large deformations at high strain rates and eventual case rupture. Once the container breaks apart, the highly pressurized product gas that escapes the failing container generates shock waves that propagate through the initially quiescent surrounding fluid.
The approach, which uses a finite-volume, multi-material compressible CFD formulation, within which solid materials are represented using a particle method known as the Material Point Method, is described, including certain of the sub-grid models required to close the governing equations. Results are first presented for "rate stick" and "cylinder test" scenarios, each of which involves detonating unconfined and confined HE material, respectively. Experimental data are available for these configurations and as such they serve as validation tests. Finally, results from an unvalidated "fast cookoff" simulation in which the HE is initiated by thermal input, which causes deflagration, are shown.
A. Gyulassy, V. Natarajan, B. Hamann, V. Pascucci.
“Efficient Computation of Morse-Smale Complexes for Three-dimensional Scalar Functions,” In IEEE Transactions on Visualization and Computer Graphics, Note: (presented at IEEE VIS 2007), 2007.
A. Gyulassy, V. Natarajan, B. Hamann, M. Duchaineau, V. Pascucci, E. Bringa, A. Higginbotham.
“Topologically Clean Distance Fields,” In IEEE Transactions on Visualization and Computer Graphics, Note: (presented at IEEE VIS 2007), 2007.
C.W. Hamman, R.M. Kirby, M. Berzins.
“Parallelization and Scalability of a Spectral Element Channel Flow Solver for Incompressible Navier-Stokes Equations,” In Concurrency and Computation: Practice and Experience, Vol. 14, No. 10, pp. 1403--1422. 2007.
C.R. Hamman, R.M. Kirby, M. Berzins.
“Parallel Direct Simulation of Incompressible Navier Stokes Equations,” In Concurrency and Computation, Vol. 19, No. 10, pp. 1403-1427. 2007.
H.B. Henninger, C.J. Underwood, S.A. Maas, R.T. Whitaker, J.A. Weiss.
“Spatial Distribution and Orientation of Dermatan Sulfate in Human Medial Collateral Ligament,” In Journal of Structural Biology, Vol. 158, No. 1, pp. 33--45. April, 2007.
DOI: 10.1016/j.jsb.2006.10.008
The proteoglycan decorin and its associated glycosaminoglycan (GAG), dermatan sulfate (DS), regulate collagen fibril formation, control fibril diameter, and have been suggested to contribute to the mechanical stability and material properties of connective tissues. The spatial distribution and orientation of DS within the tissue are relevant to these mechanical roles, but measurements of length and orientation from 2D transmission electron microscopy (TEM) are prone to errors from projection. The objectives of this study were to construct a 3D geometric model of DS GAGs and collagen fibrils, and to use the model to interpret TEM measurements of the spatial orientation and length of DS GAGs in the medial collateral ligament of the human knee. DS was distinguished from other sulfated GAGs by treating tissue with chondroitinase B, an enzyme that selectively degrades DS. An image processing pipeline was developed to analyze the TEM micrographs. The 3D model of collagen and GAGs quantified the projection error in the 2D TEM measurements. Model predictions of 3D GAG orientation were highly sensitive to the assumed GAG length distribution, with the baseline input distribution of 69 ± 23 nm providing the best predictions of the angle measurements from TEM micrographs. The corresponding orientation distribution for DS GAGs was maximal at orientations orthogonal to the collagen fibrils, tapering to near zero with axial alignment. Sulfated GAGs that remained after chondroitinase B treatment were preferentially aligned along the collagen fibril. DS therefore appears more likely to bridge the interfibrillar gap than non-DS GAGs. In addition to providing quantitative data for DS GAG length and orientation in the human MCL, this study demonstrates how a 3D geometric model can be used to provide a priori information for interpretation of geometric measurements from 2D micrographs.
Keywords: computational biomechanics, mrl
X. Huang, Y.Z. Lee, M. McKeown, G. Gerig, H. Gu, W. Lin, M.M. Lewis, S. Ford, A.I. Troster, D.R. Weinberger, Styner.
“Asymmetrical ventricular enlargement in Parkinson's Disease,” In Movement Disorders, Vol. 22, No. 11, pp. 1657--1660. August 15, 2007.
M. Ikits.
“Interactive Exploration of Volumetric Data Sets With a Combined Visual and Haptic Interface,” Note: Ph.D. Thesis, University of Utah School of Computing, 2007.
T. Ize, I. Wald, S.G. Parker.
“Asynchronous BVH Construction for Ray Tracing Dynamic Scenes on Parallel Multi-Core Architectures,” In Proceedings of the 2007 Eurographics Symposium on Parallel Graphics and Visualization, pp. 101--108. 2007.
T. Ize, P. Shirley, S.G. Parker.
“Grid Creation Strategies for Efficient Ray Tracing,” In Proceedings of the 2007 IEEE/Eurographics Symposium on Interactive Ray Tracing, pp. 27--32. 2007.
W.-K. Jeong, P.T. Fletcher, R. Tao, R.T. Whitaker.
“Interactive Visualization of Volumetric White Matter Connectivity in DT-MRI Using a Parallel-Hardware Hamilton-Jacobi Solver,” In IEEE Transactions on Visualization and Computer Graphics, Vol. 13, No. 6, pp. 1480--1487. 2007.
PubMed ID: 17968100