November 23, 2009

Administrative

• Seyed updates the end-note library on Friday
  • Papers to be added should be named: Author_Date
• Wednesday there is an Applied Phys seminar at noon
• Error on work-bench
• New conference calender
• SfN membership is coming due
• Camera

Show-and-tell / Lit-blitz

• Jeff
  • Johnson & Murphey - Scalable Variational Integrators for Constrained
  • Mechanical Systems in Generalized Coordinates
    • Finite difference representation of Lagrangian equations
    • Numerically removes problems with "energy drift"
  • Linearization of four-bar linkage: Ankle-angle to CoM position
    • Objective
      • Determine equivalence to Ting-Lockhart pendulum model
    • Rationale
      • Want to be able to use the inverted-pendulum model
    • Method
      • Linearization of the geometry relating Ankle angle to CoM excursion
    • Main Result
      • The height of the CoM of the 4-bar changes with stance-width and can be used as the equivalent height for the inverted pendulum
• Julia
  • Moment of inertia seems to go down with increased stance-width
  • McLean and Fetcho - two different types of neurons associated with fast and slow walking
• Seyed
  • A paper about Tai-Chi that gives a possible paradigm for giving a novel task for the subjects
• Stacie
  • Grellner (2008) - Brain Research Reviews
  • Bifunctional muscles may be the "correctors" for gait, while the uni-functional muscles are the clock keeper muscles regulated by the CPGs.
• Shalv
  • Yu and Schnieder - Juxtaposition hypothesis - try and determine what happens if you do two tasks at the same time.
• Vajiya
  • They need feedback in order to maintain the UCM