Cauchy-Characteristic Matching (CCM), the combination of a central 3 + 1 Cauchy code with an exterior characteristic code connected across a timelike interface, is a promising technique for the generation and extraction of gravitational waves. While it provides a tool for the exact specification of boundary conditions for the Cauchy evolution, it also allows to follow gravitational radiation al...

We present strongly stable semi-discrete finite difference approximations to the quarter space problem (x > 0, t > 0) for the first order in time, second order in space wave equation with a shift term. We consider space-like (pure outflow) and time-like boundaries, with either second or fourth order accuracy. These discrete boundary conditions suggest a general prescription for boundary conditi...

Nonlinear Invariance: Cross-Positive Vector Fields DAVID G. MEYER* AND TERI L. PIATT Nonlinear and RealTime Control Laboratory Electrical & Computer Engineering Department HAYDN N. G. WADLEY AND RAVI VANCHEESWARAN Intelligent Processing of Materials Laboratory Materials Science and Engineering Department University of Virginia Charlottesville, VA 22901 ROBERT KOSUT SC Solutions, Inc. 3211 Scott...

* Doctoral Student, The University of Alberta Business School, Edmonton, Canada T6G 2R6. Tel: (780) 492-5435. Fax: (780) 492-3325. E-mail: [email protected]. ** Stephen A. Jarislowsky Distinguished Professor of Finance, School of Business, University of Alberta, Edmonton, Alberta, Canada, T6G 2R6. Tel: (780) 492-5683. Fax: (780) 492 3325. E-mail [email protected]; Research Associate, Nati...

An Analysis of the Total Insensitivity of Input Shaping Designs Lucy Y. Pao Electrical and Computer Engineering Department University of Colorado Boulder, Colorado 80309{0425 Abstract In the modeling of exible structures, there is generally uncertainty in both the frequencies and damping constants, and it is thus important that the control methods for such systems be robust to these uncertainti...