Because of a long-term synergy with other observations from ENVISAT, there is advan-tage to derive aerosol optical thickness (AOT) using the MEdium Resolution Imaging Spectrometer (MERIS) instrument. Although limited in spectral coverage, it is possible to derive accurate AOT from MERIS. Here, we introduce a new AOT retrieval algorithm for MERIS over land surfaces, henceforth called eXtensible ...

We derive an upper bound on the generalization error of classiiers from a certain class of threshold networks. The bound depends on the margin of the classiier and the average complexity of the hidden units (where the average is over the weights assigned to each hidden unit). By representing convex combinations of decision trees or mask perceptrons as such threshold networks we obtain similar b...

The European Commission recommends the CDMAM phantom as a tool to evaluate threshold contrast visibility in digital mammography [1, 2]. The use of the CDMAM phantom for that purpose has been proposed by Young [3] and other researchers. Recently, the phantom has been criticized because of poor reproducibility of the manufacturing process [4, 5], but it is still recommended by the European Commis...

We derive an upper bound on the generalization error of classi ers from a certain class of threshold networks. The bound depends on the margin of the classi er and the average complexity of the hidden units (where the average is over the weights assigned to each hidden unit). By representing convex combinations of decision trees or mask perceptrons as such threshold networks we obtain similar b...

Global neuronal workspace theory predicts that damage to long-distance white matter (WM) tracts should impair access to consciousness during the perception of brief stimuli. To address this issue, we studied visual backward masking in 18 patients at the very first clinical stage of multiple sclerosis (MS), a neurological disease characterized by extensive WM damage, and in 18 matched healthy su...

In peripheral vision, high-frequency gratings beyond the Nyquist limit are visible as aliased patterns but, as shown previously, their visibility can be masked by superimposed sub-Nyquist gratings. Is the converse also true? Can supra-Nyquist gratings affect the detectability of sub-Nyquist gratings? In this study, we investigated the masking effect of high contrast, supra-Nyquist components of...

background: despite the widespread use of respiratory protection equipment in different jobs, the effects of these devices on people’s physiological responses are not well recognized as yet. therefore, the aim of this study is to evaluate the effect of the air purifying respiratory protection equipment on the heart rate. methods: this experimental study was performed in a climate chamber under ...