We study a continuous-time game of strategic experimentation in which the players try to assess the failure rate of some new equipment or technology. Breakdowns occur at the jump times of a Poisson process whose unknown intensity is either high or low. In marked contrast to existing models, we find that the cooperative value function does not exhibit smooth pasting at the efficient cut-off beli...

Ever since Rick Shull asked me to prepare an essay of appreciation of Fred Keller, I have found myself putting it off. Somehow, something else was always needing to be done. Finally, I realized what was happening. I just did not want to face the fact that Fred was no longer with us. After a relationship that extended over more than 50 years, during which Fred taught me both pedagogically and by...

I design and build secure and reliable networked systems using a cross-layer approach that draws from networking, operating systems, distributed systems, and computer architecture. My focus is on virtualization and the movement toward cloud-based services. Rather than simply patching existing systems, I question the underlying assumptions to create new designs that are fundamentally more secure...

Abstract We consider new numerical schemes to solve two different systems of nonlinear fractional reaction subdiffusion equations. These equations model the reversible $$A+B \rightleftharpoons C$$ A + B ⇌ C in presence ...

the angle of repose of soil particles is an important factor for determining critical shear stress for initiation of soil particles motion during the erosion process. there are different methods for measuring the angle of particle repose and the result of each method is somewhat different from those of the others. sliding and fixed-base piling methods are the two most common methods in the lite...

Recent advances in GYRO allow simulations to map out the linear stability of many eigenvalues and eigenvectors of the gyrokinetic equation (as opposed to only the most unstable) at low computational cost. In this work, GYRO’s new linear capabilities are applied to a pressure scan about the pedestal region of DIII-D shot 131997. MHD calculations in the infinite-n limit of the ideal ballooning mo...