eLearning

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WP A1-c SEE-GRID (Virtual Eye
Surgery) Wolfgang Schreiner Research Institute
for Symbolic Computation (RISC) Wolfgang.Schreiner
_at_risc.uni-linz.ac.at
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SEE-GRID

• Joint Project
• Research Institute for Symbolic Computation
  (RISC)
• Wolfgang Schreiner, Rebhi Baraka, Karoly Bosa
• Upper Austrian Research GmbH (UAR)
• Michael Buchberger, Thomas Kaltofen, Daniel
  Mitterdorfer
• SEE Software (UAR)
• Biomechanical model of the human eye
• for simulating surgical eye muscle operations.
• Students funded from the project in 2004.

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SEE Problem Domain

• Basics
• Eye model set of parameters describing the
  biomechanical structure of an eye
• Gaze pattern 2D diagram of reference points
• Problems
• Forward compute gaze pattern from eye model
• Inverse compute eye model from gaze pattern

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SEE Architecture

• SEE Clients
• Standalone application
• Java applet
• SEE Server
• Simulation component
• SOAP interface
• RMI bridge for applet

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SEE-GRID

• Transform SEE to a grid service
• Globus bridge (Client remains unchanged)

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SEE-GRID

• Parallel/distributed computation of gaze
  patterns.
• Speculative parallelism and data parallelism.

hessDiagramGrid(E1, E2, E, I) T
lookupCache(E1, E2, E, I) if T ltgt null then
C gridWait(T) clearCache(E1, E2, E,
I) return C T1 gridStart(hessDiagramG
ridCore, E1, E2, E, I) T2
gridStart(hessDiagramGridCore, E2, E1, E, I) C
gridWait(T1) storeCache(T2, E1, E2, E, I)
return C
hessDiagramGridCore(E1, E2, E, I) for each
intended gaze position i?I do Ti
gridStart(position, E1 ,E2 ,E, i) for each
intended gaze position i?I do Ci
gridWait(Ti) return C
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SEE-GRID

• Parallel/distributed computation of eye models
• Combinatorial search problem (branch and bound
  algorithm)
• Hierarchical master/worker scheme.

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SEE-GRID

• Grid database of eye models and gaze patterns
• Database search involves parallel simulations.
• Source and destination of grid computations.

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SEE-GRID

• SEE-GRID middleware
• Globus 3.2 WS (pre-WS only as a temporary
  solution)
• Globus 4 when available and useable
• Higher-level functionality?
• Support for grid database.
• http//www.risc.uni-linz.ac.at/parallel/projects/a
  grid