Filters: Collection: "ir_uspace"
| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 76 |
 |
Kirby, Robert Michael | GPU-based volume visualization from high-order finite element fields | This paper describes a new volume rendering system for spectral/hp finite-element methods that has as its goal to be both accurate and interactive. Even though high-order finite element methods are commonly used by scientists and engineers, there are few visualization methods designed to display thi... | 2014-01-01 | |
| 77 |
 |
Johnson, Christopher R. | Biomedical visual computing: case studies and challenges | Advances in computational geometric modeling, imaging, and simulation let researchers build and test models of increasing complexity, generating unprecedented amounts of data. As recent research in biomedical applications illustrates, visualization will be critical in making this vast amount of data... | 2012-01-01 | |
| 78 |
 |
Johnson, Christopher R.; Parker, Steven G.; Hansen, Charles D. | Interactive simulation and visualization | Most of us perform data analysis and visualization only after everything else is finished, which often means that we don't discover errors invalidating the results of our simulation until postprocessing. A better approach would be to improve the integration of simulation and visualization into the... | Computational steering; Interactive simulation; Isosurfaces | 1999 |
| 79 |
 |
Berzins, Martin | Investigating applications portability with the Uintah DAG-based runtime system on PetaScale supercomputers | Present trends in high performance computing present formidable challenges for applications code using multicore nodes possibly with accelerators and/or co-processors and reduced memory while still attaining scalability. Software frameworks that execute machine-independent applications code using a ... | 2013-01-01 | |
| 80 |
 |
Pascucci, Valerio | Efficient data restructuring and aggregation for I/O acceleration in PIDX | Hierarchical, multiresolution data representations enable interactive analysis and visualization of large-scale simulations. One promising application of these techniques is to store high performance computing simulation output in a hierarchical Z (HZ) ordering that translates data from a Cartesian ... | 2012-01-01 | |
| 81 |
 |
Nesdill, Daureen | Reproducible research and electronic notebooks | Reproducibility of research is an increasing concern as researchers move from print to a hybrid print/electronic to a totally electronic research project. In addition, research in many disciplines rely on large datasets, i.e. Big Data. Funding agencies have responded to this concern by addressing th... | Electronic Lab Notebooks; Reproducible research; Data management; Collaboration; Best practices; Provenance; Audit trail; Metadata | 2016 |
| 82 |
 |
Pascucci, Valerio | The natural Helmholtz-Hodge decomposition for open-boundary flow analysis | The Helmholtz-Hodge decomposition (HHD), which describes a flow as the sum of an incompressible, an irrotational, and a harmonic flow, is a fundamental tool for simulation and analysis. Unfortunately, for bounded domains, the HHD is not uniquely defined, traditionally, boundary conditions are impose... | 2014-01-01 | |
| 83 |
 |
Liu, Feng | Computational R&D for industrial applications | Recent advances in high-speed supercomputer and computational algorithms have brought us into a new era of computational materials science. These advances make it possible to investigate many existing materials systems that were previously considered intractable and also predict and design novel mat... | Computational materials science | 2005 |
| 84 |
 |
Pascucci, Valerio | Exploring performance data with boxfish | The growth in size and complexity of scaling applications and the systems on which they run pose challenges in analyzing and improving their overall performance. With metrics coming from thousands or millions of processes, visualization techniques are necessary to make sense of the increasing amount... | 2012-01-01 | |
| 85 |
 |
Rosen, Paul Andrew | Data management and analysis with WRF and SFIRE | We introduce several useful utilities in development for the creation and analysis of real wildland fire simulations using WRF and SFIRE. These utilities exist as standalone programs and scripts as well as extensions to other well known software. Python web scrapers automate the process of downloadi... | 2012-01-01 | |
| 86 |
 |
Meyer, Miriah Dawn | Visualizing data: why an (interactive) picture is worth 1000 numbers | One of the most striking and unique aspects about this moment in human history is the amount of data we are generating. This data holds the promise of unlocking the mysteries of the universe, untangling complex natural and man-made systems, and allowing us to live longer, healthier, and more product... | 2012-09-05 | |
| 87 |
 |
Lefohn, Aaron; Whitaker, Ross T. | A GPU-based, three-dimensional level set solver with curvature flow | Level set methods are a powerful tool for implicitly representing deformable surfaces. Since their inception, these techniques have been used to solve prob- lems in fields as varied as computer vision, scientific visualization, computer graphics and computational physics. With the power and flexi... | GPU-based; Level set solver | 2002-12-11 |
| 88 |
 |
Weinstein, David | Lead field basis for FEM source localization | In recent years, significant progress has been made in the area of EEG/MEG source imaging. source imaging on simple spherical models has become increasingly efficient, with consistently reported accuracy of within 5mm. In contrast, source localization on realistic head models remains slow, with sub-... | FEM source localization; Source imaging; EEG; MEG | 1999 |
| 89 |
 |
De St Germain, John Davison; Parker, Steven G.; Johnson, Christopher R. | Uintah parallelism infrastructure: a performance evaluation on the SGI origin 2000 | Uintah is a component-based visual problem solving environment (PSE) designed to specifically address the unique problems inherent in running massively parallel scientific computations on terascale computing platforms. In particular, development of the Uintah system is part of the C-SAFE [2] effort ... | Uintah; Problem solving environment; Performance analysis; Parallelism; Origin 2000; C-SAFE | 2001 |
| 90 |
 |
Hansen, Charles D. | Scout: a hardware-accelerated system for quantitatively driven visualization and analysis | Quantitative techniques for visualization are critical to the successful analysis of both acquired and simulated scientific data. Many visualization techniques rely on indirect mappings, such as transfer functions, to produce the final imagery. In many situations, it is preferable and more powerful ... | Visualization systems; Hardware acceleration; Volume rendering; Multivariate visualization | 2004 |
| 91 |
 |
Berzins, Martin | A survey of high level frameworks in block-structured adaptive mesh refinement packages | Over the last decade block-structured adaptive mesh refinement (SAMR) has found increasing use in large, publicly available codes and frameworks. SAMR frameworks have evolved along different paths. Some have stayed focused on specific domain areas, others have pursued a more general functionality, p... | 2014-01-01 | |
| 92 |
 |
Hansen, Charles D. | Flow charts: visualization of vector fields on arbitrary surfaces | We introduce a novel flow visualization method called Flow Charts, which uses a texture atlas approach for the visualization of flows defined over curved surfaces. In this scheme, the surface and its associated flow are segmented into overlapping patches, which are then parameterized and packed in ... | 2008-09 | |
| 93 |
 |
Kirby, Robert Michael | Verifying volume rendering using discretization error analysis | We propose an approach for verification of volume rendering correctness based on an analysis of the volume rendering integral, the basis of most DVR algorithms. With respect to the most common discretization of this continuous model (Riemann summation), we make assumptions about the impact of parame... | 2014-01-01 | |
| 94 |
 |
Tasdizen, Tolga; Whitaker, Ross T.; Marc, Robert E.; Jones, Bryan W. | Enhancement of cell boundaries in transmission electon microscopy images | Transmission electron microscopy (TEM) is an important modality for the analysis of cellular structures in neurobiology. The computational analysis of neurons entail their segmentation and reconstruction from TEM images. This problem is complicated by the heavily textured nature of cellular TEM ima... | 2005 | |
| 95 |
 |
Keller, Robert M. | Semantics of networks containing indeterminate operators | We discuss a denotational semantics for networks containing indeterminate operators. Our approach is based on modelling a networks by the set of all its possible behaviors. Our notion of behavior is a sequence of computational actions. The primitive computational action is an event: the appearance o... | 1984 | |
| 96 |
 |
Hansen, Charles D. | Interactive display of isosurfaces with global illumination | Abstract-In many applications, volumetric data sets are examined by displaying isosurfaces, surfaces where the data, or some function of the data, takes on a given value. Interactive applications typically use local lighting models to render such surfaces. This work introduces a method to precompute... | 2006-03 | |
| 97 |
 |
Riloff, Ellen M. | Exploiting role-identifying nouns and expressions for information extraction | We present a new approach for extraction pattern learning that exploits role-identifying nouns, which are nouns whose semantics reveal the role that they play in an event (e.g., an "assassin" is a perpetrator). Given a few seed nouns, a bootstrapping algorithm automatically learns role-identifying ... | Information extraction; Role-identifying; Nouns; Expressions; Pattern learning; Basilisk bootstrapping algorithm | 2007 |
| 98 |
 |
Pascucci, Valerio | Topology verification for isosurface extraction | The broad goals of verifiable visualization rely on correct algorithmic implementations. We extend a framework for verification of isosurfacing implementations to check topological properties. Specifically, we use stratified Morse theory and digital topology to design algorithms which verify topolog... | 2012-01-01 | |
| 99 |
 |
Tasdizen, Tolga; Whitaker, Ross T. | A geometric multigrid approach to solving the 2D inhomogeneous laplace equation with internal drichlet boundary conditions | The inhomogeneous Laplace (Poisson) equation with internal Dirichlet boundary conditions has recently appeared in several applications to image processing and analysis. Although these approaches have demonstrated quality results, the computational burden of solution demands an efficient solver. Desi... | 2005 | |
| 100 |
 |
Kirby, Robert Michael II; Johnson, Christopher R. | A new family of variational-form-based regularizers for reconstructing epicardial potentials from body-surface mapping | We propose a new family of regularizers for the inverse ECG problem, using a variational principle that underlies finite element approximation methods. As an alternative to traditional Tikhonov regularizers, the variational formulation has several advantages: 1)it enables a simple construction of ... | 2010 |