Spatial and temporal knowledge representation

Spatial and temporal knowledge representation

Representation of Temporal Knowledge

The paper describes a system of notions (a T-model) developed for representing temporal information on the semantics -pragmatics level in a natural language understanding system. The choice of the notions to be considered has been relied upon a necessity of special facilities for describing situations with various degrees of detailing according to an inexact character of temporal information in...

Temporal Knowledge Representation for

Clinical trial protocols include detailed temporal constraints on treatment and associated tasks. Unlike health-care guidelines, protocols are highly prescriptive. Therefore, informatics applications that enforce such temporal constraints are more directly useful with protocols than with guidelines. Although there are some temporal knowledge representation efforts for health-care guidelines, we...

Knowledge , Causality and Temporal Representation

In this paper, a formal semantic account of the simple past tense in text is ooered. The contributions to the interpretation of text made by the text's syntactic structure, semantic content, aspectual classiication, world knowledge of the causal relations between events, and Gricean pragmatic maxims are all represented within a single logical framework. This feature of the theory gives rise to ...

Relative Representation of Spatial Knowledge

|There have been some straightforward eeorts to extend Allen's interval-based temporal logic to spatial dimensions by using Cartesian tuples of relations 6]. We take a diierent approach based on a study of the kind of information that best relates two entities in 2-dimensional space qualitatively. The relevant spatial categories turn out to be \projection" and \orientation". We deene a small se...