Examining the dynamics of stroke ischemia is limited by the standard use of 2D-volume or voxel-based analysis techniques. Recently developed spatiotemporal models such as the 4D metamorphosis model showed promise for capturing ischemia dynamics. We used a 4D metamorphosis model to evaluate acute ischemic stroke lesion morphology from the acute diffusion-weighted imaging (DWI) to final T2-weight...

Research into the organization of high-level visual cortex has mainly used discrete object classes (e.g. faces and buildings). In contrast, the lower levels of the visual cortex have mainly been studied using phase-encoding techniques with gradually changing rotating wedges and expanding/contracting rings. The gradual stimulus changes cause traveling waves on the cortical surface and time delay...

Generic attacks against classical (balanced) Feistel schemes, unbalanced Feistel schemes with contracting functions and unbalanced Feistel schemes with expanding functions have been studied in [12], [4], [15], [16]. In this paper we study schemes where we use alternatively contracting random functions and expanding random functions. We name these schemes “Alternating Unbalanced Feistel Schemes”...

We study the effect of Debye screening of hypercharge when a net fermion number is reflected from a domain wall during a first order phase transition, which may be relevant for electroweak baryogenesis. We give a simple method for computing the effect of screening within the diffusion approximation, whose results are compatible with those of a more elaborate treatment based on the Boltzmann equ...

Covariant Lyapunov vectors or CLVs span the expanding and contracting directions of perturbations along trajectories in a chaotic dynamical system. Due to efficient algorithms compute them that only utilize trajectory information, they have been widely applied across scientific disciplines, principally for sensitivity analysis predictions under uncertainty. In this paper, we develop numerical m...