We wish to respond to the commentary of de la Iglesia et al. [1]. Studies comparing sleep in different communities have different goals. One frequent goal has been to determine how sleep is affected by manipulating specific 'modern' conditions. Many studies have investigated the effect of artificial light and electronic entertainment. Such studies have clearly shown that light, particularly blu...

The web-based, Java-written SOCR (Statistical Online Computational Resource) tools have been utilized in many undergraduate and graduate level statistics courses for seven years now (Dinov 2006; Dinov et al. 2008b). It has been proven that these resources can successfully improve students' learning (Dinov et al. 2008b). Being first published online in 2005, SOCR Analyses is a somewhat new compo...

Tiling is a crucial program transformation with many benefits: it improves locality, exposes parallelism, allows for adjusting the ops-to-bytes balance of codes, and can be applied at multiple levels. Allowing tile sizes to be symbolic parameters at compile time has many benefits, including efficient autotuning, and run-time adaptability to system variations. For polyhedral programs, parametric...

In recent years, the eld of active contour based image segmentation has seen the emergence of two competing approaches. The rst and oldest approach represents active contours in an explicit (or parametric) manner corresponding to the Lagrangian formulation. The second approach represents active contours in an implicit manner corresponding to the Eulerian framework. After comparing these two app...

José Luis Jaramillo,1, 2 Martı́n Reiris,1 and Sergio Dain3, 1 1 Max-Planck-Institut für Gravitationsphysik, Albert Einstein Institut, Am Mühlenberg 1 D-14476 Potsdam Germany 2 Laboratoire Univers et Théories (LUTH), Observatoire de Paris, CNRS, Université Paris Diderot, 92190 Meudon, France 3 Facultad de Matemática, Astronomı́a y Fı́sica, FaMAF, Universidad Nacional de Córdoba Instituto de Fı́sica ...

Image denoising is the first step of any image processing chain. If the digital image were completely noise-free, we would have access to an infinity amount of information. Thus, every means to increase the signal to noise ratio must be explored. Early studies applied linear Wiener filters equivalent to a frequency reduction of the Fourier transform. These filters are more efficient when applie...