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Considerations for the future development of virtual technology as a rehabilitation tool

Journal of NeuroEngineering and Rehabilitation 2004年第1期1卷 13-13页

作者： Kenyon, Robert V. Leigh, Jason Keshner, Emily A. Electronic Visualization Lab. Department of Computer Science University of Illinois at Chicago Chicago IL United States Sensory Motor Performance Program Rehabilitation Institute of Chicago Chicago IL United States Dept. of Phys. Med. and Rehab. Feinberg School of Medicine Northwestern University Chicago IL United States

Background: Virtual environments (VE) are a powerful tool for various forms of rehabilitation. Coupling VE with high-speed networking [Tele-Immersion] that approaches speeds of 100 Gb/sec can greatly expand its influence in rehabilitation. Accordingly, these new networks will permit various peripherals attached to computers on this network to be connected and to act as fast as if connected to a local PC. This innovation may soon allow the development of previously unheard of networked rehabilitation systems. Rapid advances in this technology need to be coupled with an understanding of how human behavior is affected when immersed in the VE. Methods: This paper will discuss various forms of VE that are currently available for rehabilitation. The characteristic of these new networks and examine how such networks might be used for extending the rehabilitation clinic to remote areas will be explained. In addition, we will present data from an immersive dynamic virtual environment united with motion of a posture platform to record biomechanical and physiological responses to combined visual, vestibular, and proprioceptive inputs. A 6 degree-of-freedom force plate provides measurements of moments exerted on the base of support. Kinematic data from the head, trunk, and lower limb was collected using 3-D video motion analysis. Results: Our data suggest that when there is a confluence of meaningful inputs, neither vision, vestibular, or proprioceptive inputs are suppressed in healthy adults;the postural response is modulated by all existing sensory signals in a non-additive fashion. Individual perception of the sensory structure appears to be a significant component of the response to these protocols and underlies much of the observed response variability. Conclusion: The ability to provide new technology for rehabilitation services is emerging as an important option for clinicians and patients. The use of data mining software would help analyze the incoming data to provide b

关键词： Networking Rehabilitation Virtual Reality Field of View Complex Behaviors

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Wire Modeling 03

Wire Modeling

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2003 ACM SIGGRAPH Sketches and Applications, SIGGRAPH 2003

作者： Mandal, Esan Akleman, Ergun Srinivasan, Vinod Visualization Sciences Program Texas A and M University United States

No abstract available.

ISBN: (纸本)9781450374668

No abstract available.

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Two methods for creating chinese painting

Two methods for creating chinese painting

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Pacific Conference on Computer Graphics and Applications

作者： Ching Chan E. Akleman Jianer Chen Visualization Sciences Program Texas A and M University USA Department of Computer Science Texas A and M University USA

We present two methods to create realistic Chinese painting. The first method is to create 3D Chinese painting animation using existing software packages. The second method is an expressive paint tool which allows an ... 详细信息

ISBN: (纸本)0769517846

关键词： Painting Brushes Ink Art visualization Animation Computer science Software packages Paints Animals

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Interactive construction of multi-segment curved handles

Interactive construction of multi-segment curved handles

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Pacific Conference on Computer Graphics and Applications

作者： V. Srinivasan E. Akleman Jianer Chen Visualization Science Program Texas A and M University USA Department of Computer Science Texas A and M University USA

In this work, we present a method to interactively create multi-segment, curved handles between two star-shaped faces of an orientable 2-manifold mesh or to connect two 2-manifold meshes along such faces. The presented algorithm combines a very simple 2D morphing algorithm with Hermite interpolation to construct the handle. Based on the method, we have developed a user interface tool that allows users to simply and easily create multi-segment curved handles.

关键词： Shape Computer graphics User interfaces Joining processes Mathematical model visualization Computer science Interpolation Algorithm design and analysis Application software

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Modeling subdivision control meshes for creating cartoon faces

Modeling subdivision control meshes for creating cartoon fac...

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International Conference on Shape Modeling and Applications

作者： S. Skaria E. Akleman F.I. Parke Visualization Sciences Program Department of Architecture Texas A and M University USA

ISBN: (纸本)0769508537

Modeling three-dimensional faces on the computer has been an interesting yet challenging problem. This paper presents a method for creating cartoon faces by using a subdivision scheme. We use set-operations for conceptual design of subdivision control meshes. To ensure the quality of the control mesh, we have eliminated high valenced extraordinary vertices since smoothness of the surface decreases with valence. In addition, we have limited the number of extraordinary vertices to eliminate ripples. We have also ensured an even structure around extraordinary vertices (The size of each quadrilateral in subdivided meshes are roughly similar). We have also developed a user-friendly interface to sculpt the control mesh. Using this interface we have been able to create a variety of cartoon faces.

关键词： Shape visualization Computer architecture Nose Forehead Animation Councils Parametric statistics Solid modeling Iterative methods

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Handle and hole improvement by using new corner cutting subdivision scheme with tension

Handle and hole improvement by using new corner cutting subd...

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International Conference on Shape Modeling and Applications

作者： E. Akleman Jianer Chen F. Eryoldas V. Srinivasan Department of Architecture Visualization Sciences Program College Station Texas Texas A&M University USA Department of Computer Science College of Engineering Department of Architecture Texas A&M University

ISBN: (纸本)0769508537

The Doubly Linked Face List (DLFL) structure introduces a powerful modeling paradigm that allows users to alternatively apply topological change operations and subdivision operations on a mesh structure. Moreover the DLFL is topologically robust in the sense that it always guarantees valid 2-manifold surfaces. We further study the relationship between DLFL structure and subdivision algorithms. First, we develop a new corner cutting scheme, which provides a tension parameter to control the shape of the subdivided surface. Second, we develop a careful and efficient algorithm for our corner cutting scheme on the DLFL structure that uses only the basic operations provided by the DLFL structure. This implementation ensures that our new corner cutting scheme preserves topological robustness. The comparative study shows that the corner cutting schemes create better handles and holes than Catmull-Clark (1978) scheme.

关键词： Robustness Shape control Computer architecture Topology Computer science Data structures Joining processes visualization Councils Educational institutions

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Nonuniversal Scaling and Conformational Crossover of Polymer Chains in an Electrophoretic Deposition

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Physical Review Letters 1997年第15期79卷 2903-2903页

作者： Grace M. Foo R. B. Pandey Supercomputing and Visualization Unit National University of Singapore Singapore 119260 Department of Physics and Astronomy Program in Scientific Computing University of Southern Mississippi Hattiesburg Mississippi 39406-5046

A computer simulation model of electrodeposition of polymer chains on an impenetrable wall is used to evaluate the power-law scaling exponents ( νx(y)) for the longitudinal and transverse spread, Rgx(y)∼Lcνx(y); we find that the exponents νx(y) depend on the field strength, i.e., they are nonuniversal. A conformational crossover is observed for the transverse spread from the bulk with νy≃1/3–2/3 to the wall with νy≃2/3–1. A similar crossover also occurs for the longitudinal component of Rg but with an opposite trend, i.e., magnitude of νx is larger in bulk than at the wall.

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Conformation of interacting polymer chains: Effects of temperature, bias, polymer concentration, and porosity

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Physical Review E 1997年第4期55卷 4433-4433页

作者： Grace M. Foo R. B. Pandey Program in Scientific Computing University of Southern Mississippi Hattiesburg Mississippi 39406-5046 Supercomputing and Visualization Unit Computer Center National University of Singapore 119260 Singapore Department of Physics and Astronomy University of Southern Mississippi Hattiesburg Mississippi 39406-5046

The conformations of interacting polymer chains driven by a biased field in heterogeneous media are studied using Monte Carlo simulations in three dimensions. In addition to excluded volume, a nearest-neighbor interaction is considered with polymer-polymer repulsion and polymer-solvent attraction. Two types of heterogeneous media are considered: (i) a homogeneous-annealed system consisting of mobile polymer chains and solvents and (ii) quenched porous media, generated by adding a random distribution of quenched barriers. Effects of polymer concentration (p), bias (B), temperature (T), and porosity (ps) on the magnitude of the radius of gyration (Rg) of the chains and its scaling with the chain length (Lc) are studied. In an annealed system, we observe a crossover in power-law variation of the radius of gyration with the chain length, Rg∼Lcγ, from an extended conformation with γ≃0.7 at low bias (B=0.2), low p, and high T to a collapsed conformation with γ∼0.20-0.31 at high bias (B⩾0.5) and low T. In a quenched porous medium, we observe a somewhat lower value of the power-law exponent, γ∼0.60-0.70, from its annealed value at high T and low bias. At low temperatures, in contrast, the magnitude of γ∼0.39-0.47 is enhanced with respect to its annealed value. Various nonlinear responses of Rg to bias are observed in different ranges of B, Lc, ps, and T. In particular, we find that the response is nonmonotonic at low temperatures (T≃0.1) in the annealed system and at high temperatures (T≃100.0) in a porous medium with a relatively high barrier concentration (pb⩾0.3).

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Developing a prototype concurrent design tool for composite topside structures

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 279-290页

作者： Dirlik, S Hambric, S Azarm, S Marquardt, M Hellman, A Bartlett, S Castelli, V Steve Dirlik:began his career at the Naval Surface Warfare Center Carderock Division in 1981 as an aerospace engineer co-op student. He completed his bachelor of science degree in aeropace and ocean engineering from Virginia Polytechnic Institute and State University in 1985 and his master of science degree in aerospace engineering from the University of Maryland in 1990. Mr. Dirlik recently completed a master of science program in applied physics at The Johns Hopins University and currently works in the Radar Cross Section and Target Physics Branch of the Signatures Directorate at the Naval Surface Warfare Center Corderoke Division. He has worked on Navy low observable programs since 1990. Stephen Hambric:is a research associate at the Applied Research Laboratory at The Pennsylvania State University. He received his B. S. and M.S. degree in mechanical engineering from Virginia Polytechnic Institute and State University and his D. Sc. in mechnical engineering from the George Washington University. He has worked on several computer aided multidiscikplinary design and optimization projects over the years including an automated propeller design system and a structural acoustic optimization capability. Dr. Shpour Azarm:is currently working as an associate professor with the Design and Manufacturing Group of the Department of Mechanical Engineering at the University of maryland at College Park. Dr Azarm's expertise is in the areas of optimization-based designed and concurrent design and optimization of multidisciplinary systems. He was a consultant at Black & Decker Corporation (summer 1996) and worked as a Navy senior summer faculty fellow (summer 1995) and a NASA summer faculty fellow (summer 1994). He was a visiting scientist at NASA Langley Research Center for Multidisciplinary Analysis and Applied Structural Optimzatiom at the University of Siegen in Germany (spring 1992) and the Design Institute of the Technical University of Denmark (summer 1990). Dr Azarm was an associate technical editor of the ASME Jour

A prototype concurrent engineering tool has been developed for the preliminary design of composite topside structures for modern navy warships. This tool, named GELS for the Concurrent Engineering of Layered Structures, provides designers with an immediate assessment of the impacts of their decisions on several disciplines which are important to the performance of a modern naval topside structure, including electromagnetic interference effects (EMI), radar cross section (RCS), structural integrity, cost, and weight. Preliminary analysis modules in each of these disciplines are integrated to operate from a common set of design variables and a common materials database. Performance in each discipline and an overall fitness function for the concept are then evaluated. A graphical user interface (GUI) is used to define requirements and to display the results from the technical analysis modules. Optimization techniques, including feasible sequential quadratic programming (FSQP) and exhaustive search are used to modify the design variables to satisfy all requirements simultaneously. The development of this tool, the technical modules, and their integration are discussed noting the decisions and compromises required to develop and integrate the modules into a prototype conceptual design tool.

关键词： Warships

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Using the world wide web to build learning communities in K-12

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Journal of Computer-Mediated Communication 1996年第3期2卷

作者： Gordin, Douglas N. Gomez, Louis M. Pea, Roy D. Fishman, Barry J. Northwestern University Sch. of Education and Social Policy United States Learning Sciences Program Northwestern University School of Education United States Department of Education Northwestern University United States Center for Technology in Learning SRI International United States Collaborative Visualization Project Northwestern University United States

Social accounts of learning and human knowledge have led to attempts to reorganize schools as learning communities. This paper examines the utility of the World Wide Web for aiding in the construction of school-based and work-based learning communities. An ordered list of interactions is provided to characterize the depth of students' entry into new learning communities. Current offerings on the World Wide Web are then surveyed in terms of these categories. Finally, proposals are advanced for enhancing the architecture of the WWW to facilitate its use for the creation and operation of learning communities.

关键词： Computer aided instruction

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