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Creator | Title | Description | Subject | Date |
| 26 |
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Gopalakrishnan, Ganesh | Ovis: A framework for visual analysis of ocean forecast ensembles | We present a novel integrated visualization system that enables interactive visual analysis of ensemble simulations of the sea surface height that is used in ocean forecasting. The position of eddies can be derived directly from the sea surface height and our visualization approach enables their int... | | 2014-01-01 |
| 27 |
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Balasubramonian, Rajeev | Sandbox prefetching: safe run-time evaluation of aggressive prefetchers | Memory latency is a major factor in limiting CPU per- formance, and prefetching is a well-known method for hiding memory latency. Overly aggressive prefetching can waste scarce resources such as memory bandwidth and cache capacity, limiting or even hurting performance. It is therefore important to e... | | 2014-01-01 |
| 28 |
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Regehr, John | Cause reduction for quick testing | Abstract-In random testing, it is often desirable to produce a "quick test" - an extremely inexpensive test suite that can serve as a frequently applied regression and allow the benefits of random testing to be obtained even in very slow or oversubscribed test environments. Delta debugging is an alg... | | 2014-01-01 |
| 29 |
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Berzins, Martin | Systematic debugging methods for large-scale HPC computational frameworks | Parallel computational frameworks for high-performance computing are central to the advancement of simulation-based studies in science and engineering. Finding and fixing bugs in these frameworks can be time consuming. If left unchecked, these bugs diminish the amount of new science performed. A sys... | | 2014-01-01 |
| 30 |
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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 |
| 31 |
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Pascucci, Valerio | Exploring power behaviors and trade-offs of in-situ data analytics | As scientific applications target exascale, challenges related to data and energy are becoming dominating concerns. For example, coupled simulation workflows are increasingly adopting in-situ data processing and analysis techniques to address costs and overheads due to data movement and I/O. However... | | 2013-01-01 |
| 32 |
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Pascucci, Valerio | Characterization and modeling of PIDX parallel I/O for performance optimization | Parallel I/O library performance can vary greatly in re- sponse to user-tunable parameter values such as aggregator count, file count, and aggregation strategy. Unfortunately, manual selection of these values is time consuming and dependent on characteristics of the target machine, the underlying fi... | | 2013-01-01 |
| 33 |
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Kirby, Robert Michael | A scalable, efficient scheme for evaluation of stencil computations over unstructured meshes | Stencil computations are a common class of operations that appear in many computational scientific and engineering applications. Stencil computations often benefit from compile-time analysis, exploiting data-locality, and parallelism. Post-processing of discontinuous Galerkin (dG) simulation solutio... | | 2013-01-01 |
| 34 |
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Hansen, Charles D. | Interactive rendering and efficient querying for large multivariate seismic volumes on consumer level PCs | We present a volume visualization method that allows interactive rendering and efficient querying of large multivariate seismic volume data on consumer level PCs. The volume rendering pipeline utilizes a virtual memory structure that supports out-of-core mul- tivariate multi-resolution data and a GP... | | 2013-01-01 |
| 35 |
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Gopalakrishnan, Ganesh | Efficient search for inputs causing high floating-point errors | Tools for floating-point error estimation are fundamental to program understanding and optimization. In this paper, we focus on tools for determining the input settings to a floating point routine that maximizes its result error. Such tools can help support activities such as precision allocation, p... | | 2014-01-01 |
| 36 |
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Venkatasubramanian, Suresh | Track estimation using link line crossing information in wireless networks | Device-free or non-cooperative localization uses the changes in signal strength measured on links in a wireless network to estimate a person's position in the network area. Existing methods provide an instantaneous coordinate estimate via radio tomographic imaging or location fingerprinting. In this... | | 2013-01-01 |
| 37 |
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Henderson, Thomas C. | Target localization and autonomous navigation using wireless sensor networks -a pseudogradient algorithm approach | Autonomous mobile robots (AMRs) operating in unknown environments face twin challenges: 1) localization and 2) efficient directed navigation. This paper describes a two-tiered approach to solving these challenges: 1) by developing novel wireless-sensor-network (WSN)-based localization methods and 2)... | | 2014-01-01 |
| 38 |
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Potter, Kristin Carrie | Uncertainty visualization in forward and inverse cardiac models | Quantification and visualization of uncertainty in cardiac forward and inverse problems with complex geometries is subject to various challenges. Specific to visualization is the observation that occlusion and clutter obscure important regions of interest, making visual assessment difficult. In orde... | | 2013-01-01 |
| 39 |
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Venkatasubramanian, Suresh | Power to the points: validating data memberships in clusterings | In this paper, we present a method to attach affinity scores to the implicit labels of individual points in a clustering. The affinity scores capture the confidence level of the cluster that claims to "own" the point. We demonstrate that these scores accurately capture the quality of the label assig... | | 2013-01-01 |
| 40 |
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Regehr, John | Help, help, Im being suppressed the significance of suppressors in software testing | Abstract-Test features are basic compositional units used to describe what a test does (and does not) involve. For example, in API-based testing, the most obvious features are function calls; in grammar-based testing, the obvious features are the elements of the grammar. The relationship between fea... | | 2013-01-01 |
| 41 |
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Gopalakrishnan, Ganesh | Overcoming extreme-scale reproducibility challenges through a unified, targeted, and multilevel toolset | Reproducibility, the ability to repeat program executions with the same numerical result or code behavior, is crucial for computational science and engineering applications. However, non-determinism in concurrency scheduling often hampers achieving this ability on high performance computing (HPC) sy... | | 2013-01-01 |
| 42 |
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Balasubramonian, Rajeev | Quantifying the relationship between the power delivery network and architectural policies in a 3D-stacked memory device | Many of the pins on a modern chip are used for power delivery. If fewer pins were used to supply the same current, the wires and pins used for power delivery would have to carry larger currents over longer distances. This results in an "IR-drop" problem, where some of the voltage is dropped across t... | | 2013-01-01 |
| 43 |
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Hibler, Michael J. | Isolation of malicious external inputs in a security focused adaptive execution environment | Reliable isolation of malicious application inputs is necessary for preventing the future success of an observed novel attack after the initial incident. In this paper we describe, measure and analyze, Input-Reduction, a technique that can quickly isolate malicious external inputs that embody unfore... | | 2013-01-01 |
| 44 |
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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 |
| 45 |
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Bargteil, Adam Wade | Multiphase flow of immiscible fluids on unstructured moving meshes | In this paper, we present a method for animating multiphase flow of immiscible fluids using unstructured moving meshes. Our underlying discretization is an unstructured tetrahedral mesh, the deformable simplicial complex (DSC), that moves with the flow in a Lagrangian manner. Mesh optimization opera... | | 2014-01-01 |
| 46 |
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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 |
| 47 |
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Hansen, Charles D. | Transfer function design based on user selected samples for intuitive multivariate volume exploration | Multivariate volumetric datasets are important to both science and medicine. We propose a transfer function (TF) design approach based on user selected samples in the spatial domain to make multivariate volumetric data visualization more accessible for domain users. Specifically, the user starts the... | | 2013-01-01 |
| 48 |
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Bronson, Jonathan Richard | Lattice cleaving: a multimaterial tetrahedral meshing algorithm with guarantees | We introduce a new algorithm for generating tetrahedral meshes that conform to physical boundaries in volumetric domains consisting of multiple materials. The proposed method allows for an arbitrary number of materials, produces high-quality tetrahedral meshes with upper and lower bounds on dihedral... | | 2014-01-01 |
| 49 |
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Hansen, Charles D. | Evaluation of depth of field for depth perception in DVR | In this paper we present a user study on the use of Depth of Field for depth perception in Direct Volume Rendering. Direct Volume Rendering with Phong shading and perspective projection is used as the baseline. Depth of Field is then added to see its impact on the correct perception of ordinal depth... | | 2013-01-01 |
| 50 |
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Gopalakrishnan, Ganesh | Visual analysis of uncertainties in ocean forecasts for planning and operation of off-shore structures | We present a novel integrated visualization system that enables interactive visual analysis of ensemble simulations used in ocean forecasting, i.e, simulations of sea surface elevation. Our system enables the interactive planning of both the placement and operation of off-shore structures. We illust... | | 2013-01-01 |
