Publications
Visualization of Time Dependant, Quasi Streamwise Vortex Tubes in a Bubble-Laden Turbulent Boundary Layer over a Flat Plate, HPCMP User's Group Conference 2006
Slides & Talk are available on the ERDC PET OKC
By Randall Hand & Paul Adams of the ERDC MSRC, and Antonino Ferrante of the University of California
This paper presents a strategy for visualizing and tracking streamwise vortex tubes in a time-dependant, direct numerical simulation (DNS) of a developing turbulent boundary layer over a flat plate. Two case studies are considered. The first is a DNS Study of microbubble-laden spatially developing turbulent boundary layers over a flat plate. In this case, the spatially developing turbulent boundary layer of liquid waer is laden with gaseous air microbubbles. This case study was chosen to explain the fundamental physical mechanisms responsible for the reduction of skin-friction because of the presence of the microbubbles. The quasi-streamwise vortex tubes are identified as connected flow regions of negative values using the lambda2 method. These DNS results for the bubble-laden flow are then compared with those for the single-phase flow, In both cases, the visualization technique is used to show how the vortical structures interact and evolve over time. By coupling a lambda2 vortex detector with a predictor-corrector algorithm, a vorticity isosurface can be generated with much more confidence and detail than from a traditional marching cubes algorithm. Individual tubes can be extracted from the data and visualized separately from the rest of the flow, and seemingly disconnected isosurfaces can be found to actually be from the same vortex. This facilitates many other visualizations such as vortex core intensity and individual vortex evolution across time.Based on work started at the University of Stuttgart, Germany.
Modeling Breaking Ship Waves for Design and Analysis of Naval Vessels, HPCMP Users Group Conference 2006
Gabriel Weymouth, Kelli Hendrickson, & Dick K.P. Yue from the Department of Mechanical Engineering, MIT
Douglas G. Dommermuth from the Naval Hydrodynamics Division, SAIC
Three-Dimensional Target Visualization from Wide-Angle IFSAR Data The Resource - Fall 2005, p3-9 (local copy)
By Randolph L. Moses, The Ohio State University, and Paul Adams, Randall Hand, and Tommy Biddlecome, ERDC MSRC
ezViz - An Open-Source, Cross-Platform visualization tool The Resource - Fall 2005 p15-19 (local copy)
By Randall Hand and Paul Adams
See the back cover (last page) of the issue for examples of ezViz outputs
3-D Target Visualization from Wide-Angle IFSAR Data DoD User's Group 2005
Tom Biddlecome, Paul Adams and Randall Hand, ERDC Major Shared Resource Center (MSRC), Scientific Visualization Center, co-authored a paper with Dr. Randy Moses, Ohio State University, titled "3-D Target Visualization from Wide-Angle IFSAR Data," presented at the presented at the High Performance Computing Users Group Conference in Nashville, TN, 27 June –30 June. The paper addressed the problem of developing 3-D spatial representations of objects by processing sparse, wide-angle radar measurements of that object. The paper described an approach in which multiple interferometric synthetic aperture radar (IFSAR) image pairs are obtained, each using a modest angular aperture. Each IFSAR image pair is used to extract 3-D scattering locations and attributes. The points are combined to form object reconstructions and are visualized with volume-rendering methods.
ezVis - An Open-Source, Cross-Platform Visualization Tool (local copy) Randall Hand and Paul Adams, DoD User's Group 2005
This paper was accepted & presented at DOD User's Group 2005, and the abstract appears in the printed proceedings handed out at the conference. Unfortunately, due to a paperwork handling error (*grumble grumble grumble*) it was not printed in the final proceedings nor available on the website. The paper can be found in an almost exact reproduction in the Resource edition.
A Faster Technique For Rendering Meshes In Multiple Display Systems (2002) (local copy)
(My master's thesis.)
Level of detail algorithms have widely been implemented in architectural VR walkthroughs and video games, but have not had widespread use in VR terrain visualization systems. This thesis explains a set of optimizations to allow most current level of detail algorithms run in the types of multiple display systems used in VR. It improves both the visual quality of the system through use of graphics hardware acceleration, and improves the framerate and running time through modifications to the computations that drive the algorithms. Using ROAM as a testbed, results show improvements between 10% and 100% on varying machines.
"Triton User's Manual," Tech.Rep. MSSU-COE-ERC-01-15, R. E. Hand and R. Moorhead, Dec. 2001. (local copy)
User's manual for the "Triton" system, a VRJuggler based CAVE Visualization system to replace Cthru. This system was the testbed for my thesis.
"Triton Technical Overview," Tech.Rep. MSSU-COE-ERC-01-14, R. E. Hand and R. Moorhead, Nov. 2001. (local copy)
Technical report detailing the progress and capabilities of the Triton system.
Patents
These are patents of which I am a co-inventor. Alot of these are still pending.
Interactive Computer-Assisted Surgery System and Method WO2004070577 US2006058616
A system and method for providing computer assistance for performing a medical procedure provides a graphical user interface to guide and/or assist a user, for example a surgeon, performing the medical procedure, whether surgical or non-surgical. The computer-assisted system comprises a software application that may be used for a medical procedure.
System and Method for Providing Computer Assistance with Spinal Fixation Procedures WO2004070581 US20050267354
A system and method for providing computer assistance for performing a medical procedure, for example spinal fixation, provides a graphical user interface to guide and/or assist a user, for example a surgeon, performing the medical procedure, whether surgical or non-surgical. The computer-assisted system comprises a software application, for example a spinal fixation application, that may be used for a medical procedure, for example spine linking, etc.
Computer-Assisted Knee Replacement Apparatus and Method
Total Knee: WO2004070580 US2005267353
A computer-assisted knee replacement apparatus and method comprises a total knee replacement application for assisting, guiding, and planning a total knee replacement procedure. The apparatus and method cooperates with a tracking system to determine implant sizing and location. The apparatus and method also cooperates with the tracking system to determine required tibial and femoral preparation corresponding to the implant size and location and provides real-time monitoring of the tibial and femoral surface preparation procedures.Unicondylar: EP1605810 WO2004069036
A computer-assisted knee replacement apparatus and method comprises a knee replacement application for assisting, guiding, and planning a unicondylar knee replacement procedure. The apparatus and method cooperates with a tracking system to determine implant sizing and location. The apparatus and method also cooperates with the tracking system to determine required tibial and femoral preparation corresponding to the implant size and location and provides real-time monitoring of the tibial and femoral surface preparation procedures.
Computer-assisted external fixation apparatus and method WO2004070573 US2005267722
A computer-assisted external fixation apparatus and method comprises an external fixation application for assisting, guiding, and planning an external fixation procedure. The external fixation application cooperates with a tracking system to acquire kinematic data corresponding to a selected joint during manipulation of the selected joint and/or acquire image data of patient anatomy and determine a kinematic parameter for the selected joint using the kinematic and/or image data, such as an axis of rotation or plane of movement. The external fixation application may then be used with the tracking system to provide real-time alignment information for alignment of an external fixator based on the information associated with the determined kinematic parameter.
Method and apparatus for computer assistance with total hip replacement procedure WO2004069041 US2005281465
Hip replacement surgery involves replacing the head and neck of the femur with an artificial component having a ball-shaped head and neck similar to that of a replaced femoral head and neck and inserting a cup-shaped component into the acetabulum to act as a liner to receive the ball of the femoral component. During this procedure, a surgeon encounters or has to overcome several problems. These problems include establishing the correct inclination, version and medialization for the acetabular component of the artificial hip; the correct version or angle of the femoral component; and maintaining correct leg length.
Method And Apparatus for Computer Assistance with Intramedullary Nail Procedure WO2004069040
A specially-programmed, computer-assisted surgery system is used to reduce the number of fluoroscopic images required to be taken during the course of a intramedullary nail procedure, eliminates the need for a Steinman pin, and assists the surgeon in properly aligning and securing the nail during insertion.
Last Updated Monday, October 29 2007 @ 03:20 PM CDT; 2,492 Hits 
