This article suggests a theory of egocentric semantic reference systems for human observations of affordances that can be used to semantically account for subjective human observations on the web. Based on the perceptual theory of affordances, which suggests that humans perceive the potential actions the environment affords, an egocentric semantic reference frame is established, which is anchor...

esophagogastric varices are a frequent complication of portal hypertension. bleeding from ectopic varices of the ileum is not only life-threatening, but its accurate diagnosis is also difficult. we have presented the case of a 31-year-old man with massive hematochezia. he was a known case of non-cirrhotic portal hypertension since 15 years prior. conventional examination that included angiograp...

abstractbackground: although electronic portal imaging devices (epids) have originally developed for positioning verification, they can also be used for dosimetric purposes. in the current work, the dose response of minimum detectable thickness of a scanning liquid filled ion chamber epid, slic-epid, and the variation of transmitted dose with the shift of inhomogeneity inside of phantom was als...

This paper presents the experience of using a particular web based groupware tool, Basic Support for Cooperative Work (BSCW), in the frame of the health portal EDUSAN. EDUSAN is a complex integrated system that responds to desiderata of maintaining and improving the health status at individual, community and society level, containing an interconnected database system in the patient education, e...