In this paper, a Maximum Entropy Markov Model (MEMM) for dialog state tracking is proposed to efficiently handle user goal evolvement in two steps. The system first predicts the occurrence of a user goal change based on linguistic features and dialog context for each dialog turn, and then the proposed model could utilize this user goal change information to infer the most probable dialog state ...

Dynamic Epistemic Logic (DEL) is the study of how to reason about knowledge, belief, and communication. This paper studies the relative expressivity of certain fragments of the DEL language for public and private communication. It is shown that the language of public communication with common knowledge and the language of private communication with common knowledge are expressively incomparable...

In an end-to-end dialog system, the aim of dialog state tracking is to accurately estimate a compact representation of the current dialog status from a sequence of noisy observations produced by the speech recognition and the natural language understanding modules. A state tracking module is primarily meant to act as support for a dialog policy but it can also be used as support for dialog corp...

A large part of human communication involves referring to entities in the world and often these entities are objects that are visually present for the interlocutors. A system that aims to resolve such references needs to tackle a complex task: objects and their visual features need to be determined, the referring expressions must be recognised, and extra-linguistic information such as eye gaze ...

We present a logic programming based dialogue system that enables the access in natural language to the heterogeneous external relational databases of the Évora University. The proposed system has the capability of inferring user attitudes and uses ISCO in order to view the University relational databases as a part of a declarative/deductive object-oriented (with inheritance) database allowing ...

Sign languages appear to be the major communication tool for the deaf community. As a minor community, Vietnamese deaf people often have to rely on a small numbers of interpreters who are hearing people knowing sign language in order to communicate with hearing people. It would be very beneficial for deaf as well as hearing people to develop an automated translation system between spoken/writte...