purpose : to evaluate indications, risk factors and outcome of repeat penetrating keratoplasty (pkp) at a tertiary referral eye care center methods : in this retrospective study, medical chart of patients who underwent repeat pkp at labbafinejad medical center between january 2004 and december 2009 were reviewed. results : a total of 1,859 corneal transplantations were performed on 1,624 eyes d...

Gazing activities during utterances and silence were analyzed in a face-to-face three party conversation setting in a native language (L1) and in a second language (L2). The function of each utterance was categorized (Traum, 1994) so that gazes during utterances could be analyzed from the viewpoint of grounding in communication (Clark, 1996). The result of a factor analysis suggests that langua...

The grounding process relies on the evidence that speakers give about their understanding (Clark and Schaefer, 1989). However in existing models of grounding (Cahn, 1992; Cahn and Brennan, 1999; Traum, 1999) evidence of understanding is assumed to be symmetrically and synchronously shared by the speakers. We propose a grounding model based on (Cahn, 1992) that removes these simplifications; we ...

Collecting a large amount of real human-computer interaction data in various domains is a cornerstone in the development of better data-driven spoken dialog systems. The DialPort project is creating a portal to collect a constant stream of real user conversational data on a variety of topics. In order to keep real users attracted to DialPort, it is crucial to develop a robust evaluation framewo...