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Displaying 1-22 out of 22 total
Correction: A Near Optimal Isosurface Extraction Algorithm Using the Span Space
Found in: IEEE Transactions on Visualization and Computer Graphics
By Yarden Livnat, Han-Wei Shen, Christopher R. Johnson
Issue Date:June 1996
pp. 184
No summary available.
 
Computational Medicine: Bioelectric Field Problems
Found in: Computer
By Christopher R. Johnson, Robert S. MacLeod, Michael A. Matheson
Issue Date:October 1993
pp. 59-67
<p>Applications of large-scale computer modeling and simulation to a class of bioelectric field problems in a variety of biomedical research areas, from single cells to full human structures, are described. The authors focus on a specific subset of b...
 
A Near Optimal Isosurface Extraction Algorithm Using the Span Space
Found in: IEEE Transactions on Visualization and Computer Graphics
By Yarden Livnat, Han-Wei Shen, Christopher R. Johnson
Issue Date:March 1996
pp. 73-84
<p><b>Abstract</b>—We present the
 
A Tie-Breaking Strategy for Processor Allocation in Meshes
Found in: Parallel Processing Workshops, International Conference on
By Christopher R. Johnson, David P. Bunde, Vitus J. Leung
Issue Date:September 2010
pp. 331-338
Many of the proposed algorithms for allocating processors to jobs in supercomputers choose arbitrarily among potential allocations that are
 
A Constraint-Based Technique for Haptic Volume Exploration
Found in: Visualization Conference, IEEE
By Milan Ikits, J. Dean Brederson, Charles D. Hansen, Christopher R. Johnson
Issue Date:October 2003
pp. 35
We present a haptic rendering technique that uses directional constraints to facilitate enhanced exploration modes for volumetric datasets. The algorithm restricts user motion in certain directions by incrementally moving a proxy point along the axes of a ...
 
Simulation Steering with SCIRun in a Distributed Environment
Found in: High-Performance Distributed Computing, International Symposium on
By Michelle Miller, Charles D. Hansen, Steven G. Parker, Christopher R. Johnson
Issue Date:July 1998
pp. 364
SCIRun is a problem solving environment (PSE) that provides the ability to guide or steer a running computation within a global address space. Extending such a tightly-integrated, performance-sensitive framework to enable pieces of the computation to run o...
 
An Integrated Problem Solving Environment: The SCIRun Computational Steering System
Found in: Hawaii International Conference on System Sciences
By Steven G. Parker, Michelle Miller, Charles D. Hansen, Christopher R. Johnson
Issue Date:January 1998
pp. 147
No summary available.
   
Computational Steering Software Systems and Strategies
Found in: Computing in Science and Engineering
By Steven G. Parker, Christopher R. Johnson, David Beazley
Issue Date:October 1997
pp. 50-59
With today's large and complex applications, scientists have increasing difficulty analyzing and visualizing vast amounts of data. Computational steering is an emerging technology that addresses this problem, providing a mechanism for integrating simulatio...
 
Computational Steering and the SCIRun Integrated Problem Solving Environment
Found in: Scientific Visualization Conference
By Steven G. Parker, Charles D. Hansen, Christopher R. Johnson, Michelle Miller
Issue Date:June 1997
pp. 257
SCIRun is a problem solving environment that allows the interactive construction, debugging, and steering of large-scale scientific computations. We review related systems and introduce a taxonomy that explores different computational steering solutions. C...
 
Isosurfacing in Span Space with Utmost Efficiency (ISSUE)
Found in: Visualization Conference, IEEE
By Han-Wei Shen, Charles D. Hansen, Yarden Livnat, Christopher R. Johnson
Issue Date:November 1996
pp. 287
We present efficient sequential and parallel algorithms for isosurface extraction. Based on the Span Space data representation, new data subdivision and searching methods are described. We also present a parallel implementation with an emphasis on load bal...
 
SCIRun: A Scientific Programming Environment for Computational Steering
Found in: SC Conference
By Steven G. Parker, Christopher R. Johnson
Issue Date:December 1995
pp. 52
We present the design, implementation and application of SCIRun, a scientific programming environment that allows the interactive construction, debugging and steering of large scale scientific computations. Using this
 
Theme Editor's Introduction: Computational Inverse Problems in Medicine
Found in: Computing in Science and Engineering
By Christopher R. Johnson
Issue Date:December 1995
pp. 42-45
<p>Inverse methods are the opposite of prediction. They're a little like imitating the great detective Sherlock Holmes except that the math is more complicated. Basically, you carefully study the evidence of the scene and from it try to infer who was...
 
Sweeping Simplices: A Fast Iso-Surface Extraction Algorithm for Unstructured Grids
Found in: Visualization Conference, IEEE
By Han-Wei Shen, Christopher R. Johnson
Issue Date:November 1995
pp. 143
We present an algorithm that accelerates the extraction of iso-surfaces from unstructured grids by avoiding the traversal of the entire set of cells in the volume. The algorithm consists of a sweep algorithm and a data decomposition scheme. The sweep algor...
 
The Top 10 Challenges in Extreme-Scale Visual Analytics
Found in: IEEE Computer Graphics and Applications
By Pak Chung Wong,Han-Wei Shen,Christopher R. Johnson,Chaomei Chen,Robert B. Ross
Issue Date:July 2012
pp. 63-67
A team of scientists and researchers discusses the top 10 challenges in extreme-scale visual analytics (VA). The discussion covers applying VA technologies to both scientific and nonscientific data, evaluating the problems and challenges from both technica...
 
Uintah: A Massively Parallel Problem Solving Environment
Found in: High-Performance Distributed Computing, International Symposium on
By J. Davison de St. Germain, John McCorquodale, Steven G. Parker, Christopher R. Johnson
Issue Date:August 2000
pp. 33
This paper describes Uintah, a component-based visual problem-solving environment (PSE) that is designed to specifically address the unique problems of massively parallel computation on terascale computing platforms. Uintah supports the entire life cycle o...
 
Visualizing Vector Fields Using Line Integral Convolution and Dye Advection
Found in: Volume Visualization and Graphics, IEEE Symposium on
By Han-Wei Shen, Christopher R. Johnson, Kwan-Liu Ma
Issue Date:October 1996
pp. 63
We present local and global techniques to visualize three-dimensional vector field data. Using the Line Integral Convolution (LIC) method to image the global vector field, our new algorithm allows the user to introduce colored
 
A comprehensive calibration and registration procedure for the Visual Haptic Workbench
Found in: Proceedings of the workshop on Virtual environments 2003 (EGVE '03)
By Charles D. Hansen, Christopher R. Johnson, Milan Ikits
Issue Date:May 2003
pp. 247-254
We present a simple yet efficient calibration and registration procedure for improving the overall static display accuracy of the Visual Haptic Workbench. The procedure is used for precisely colocating the visual and haptic workspaces of the system and is ...
     
SCIRun: applying interactive computer graphics to scientific problems
Found in: ACM SIGGRAPH 96 Visual Proceedings: The art and interdisciplinary programs of SIGGRAPH '96 (SIGGRAPH '96)
By Christopher R. Johnson, Steven G. Parker
Issue Date:August 1996
pp. 111
This paper describes a physically-based rendering system tailored to the demands of lighting design and architecture. The simulation uses a light-backwards ray-tracing method with extensions to efficiently solve the rendering equation under most conditions...
     
SCIRun: a scientific programming environment for computational steering
Found in: Proceedings of the 1995 ACM/IEEE conference on Supercomputing (CDROM) (Supercomputing '95)
By Christopher R. Johnson, Steven G. Parker
Issue Date:December 1995
pp. 52-es
This paper describes the implementation of two high performance linear equation solvers developed for the Fujitsu VPP500, a distributed memory parallel supercomputer system. The solvers take advantage of the key architectural features of VPP500--(1) scalab...
     
An entry-level course in computational engineering and science
Found in: Proceedings of the twenty-sixth SIGCSE technical symposium on Computer science education (SIGCSE '95)
By Christopher R. Johnson, Eric N. Eide, Joseph L. Zachary, Kenneth W. Parker
Issue Date:March 1995
pp. 313-317
In Engineering curricula, the introductory course in computer science is an essential component of the lower division preparation of all engineers. Unfortunately, there is absolutely no consensus what should be included in an introductory computer science ...
     
A computational steering model applied to problems in medicine
Found in: Proceedings of the 1994 ACM/IEEE conference on Supercomputing (Supercomputing '94)
By Christopher R. Johnson, Steven G. Parker
Issue Date:November 1994
pp. 540-549
We describe a computational steering model which allows users to interactively change boundary conditions, model geometry, and computational parameters via a graphical user interface. To replace the typical simulation mode -- in which the researcher manual...
     
Computational bioimaging for medical diagnosis and treatment
Found in: Communications of the ACM
By Christopher R. Johnson
Issue Date:January 1988
pp. 74-76
Case study findings from several corporate environments suggest that successful virtualization does not depend on the degree of technological sophistication. It's how the tools are used that matters.
     
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