We introduce a new problem in the study of doubling spaces: Given a point set S and a target dimension d∗, remove from S the fewest number of points so that the remaining set has doubling dimension at most d∗. We present a bicriteria approximation for this problem, and extend this algorithm to solve a group of proximity problems.

between 15 october and 23 december 1975, a total of 22 cases of infectious hepatitis were reported from an upper class private school in the suburbs of tehran. careful examination revealed that one of the early cases had transmitted the disease to other children in the school during the last days of the incubation period.

We introduce a novel approach towards Harnack’s inequality in the context of spaces of homogeneous type. This approach, based on the socalled critical density property and doubling properties for weights, avoids the explicit use of covering lemmas and BMO.

The accuracy of time-to-contact (TTC) judgments for single approaching objects is well researched, however, close to nothing is known about our ability to make simultaneous TTC judgments for two or more objects. Such complex judgments are required in many everyday situations, for instance when crossing a multi-lane street or when engaged in multi-player ball games. We used a prediction-motion p...

The authors describe ACT-R/perceptual-motor (ACT-R/PM), an integrated theory of cognition, perception, and action that consists of the ACT-R production system and a set of perceptual-motor modules. Each module (including cognition) is essentially serial, but modules run in parallel with one another. ACT-R/PM can model simple dual tasks such as the psychological refractory period (PRP), includin...

We give new examples of discrete Schrδdinger operators with potentials taking finitely many values that have purely singular continuous spectrum. If the hull X of the potential is strictly ergodic, then the existence of just one potential x in X for which the operator has no eigenvalues implies that there is a generic set in X for which the operator has purely singular continuous spectrum. A su...

Most studies using the psychological refractory period (PRP) design suggest that dual-task performance is limited by a central bottleneck. Because subjects are usually told to emphasize Task 1, however, the bottleneck might reflect a strategic choice rather than a structural limitation. To evaluate the possibility that central operations can proceed in parallel, albeit with capacity limitations...

Local weather factors are widely considered to influence the transmission of infectious gastroenteritis. Few studies, however, have examined the non-stationary relationships between global climatic factors and transmission of infectious gastroenteritis. We analyzed monthly data for cases of infectious gastroenteritis in Fukuoka, Japan from 2000 to 2012 using cross-wavelet coherency analysis to ...

Consider the following model (investigated in Ball, Mollison and Scalia-Tomba (1997)) for the spread of an epidemic among a closed nite population partitioned into households. For n = 1; 2; : : :, let mn be the number of households of size n and N = P 1 n=1 nmn be the total number of individuals. The epidemic is initiated by a number of individuals becoming infected at time t = 0. The infectiou...

Background and Aim: In recent decades, the emergence of resistant strains of staphylococcus aureus, pneumococci, enterococcus and intestinal gram-negative bacteria due to the inappropriate use of antibiotics has emphasized the necessity of proper use of antibiotics. The aim of this study was to evaluate the appropriate antibiotic administration by general practitioner in the emergency departmen...